ARCH COMMUNICATIONS GROUP INC /DE/
S-4, 2000-01-28
RADIOTELEPHONE COMMUNICATIONS
Previous: FEDERATED MANAGED ALLOCATION PORTFOLIOS, NSAR-B, 2000-01-28
Next: LB VARIABLE INSURANCE ACCOUNT I, 497, 2000-01-28



<PAGE>   1

    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 28, 2000

                                                     REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

                        ARCH COMMUNICATIONS GROUP, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                <C>                                <C>
             DELAWARE                             4812                            31-1358569
 (STATE OR OTHER JURISDICTION OF      (PRIMARY STANDARD INDUSTRIAL             (I.R.S. EMPLOYER
  INCORPORATION OR ORGANIZATION)      CLASSIFICATION CODE NUMBER)           IDENTIFICATION NUMBER)
</TABLE>

                        1800 WEST PARK DRIVE, SUITE 250
                        WESTBOROUGH, MASSACHUSETTS 01581
       (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA
               CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------

                              C. EDWARD BAKER, JR.
                      CHAIRMAN AND CHIEF EXECUTIVE OFFICER
                        ARCH COMMUNICATIONS GROUP, INC.
                        1800 WEST PARK DRIVE, SUITE 250
                        WESTBOROUGH, MASSACHUSETTS 01581
                                 (508) 870-6700
            (NAME, ADDRESS INCLUDING ZIP CODE, AND TELEPHONE NUMBER
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                            ------------------------

                                   COPIES TO:

<TABLE>
<S>                                                 <C>
                EDWARD YOUNG, ESQ.                                    JOHN R. SCHMIDT
               JAY E. BOTHWICK, ESQ.                               MAYER, BROWN & PLATT
             DAVID A. WESTENBERG, ESQ.                           190 SOUTH LASALLE STREET
               C/O HALE AND DORR LLP                           CHICAGO, ILLINOIS 60603-3441
                  60 STATE STREET                                     (312) 782-0600
            BOSTON, MASSACHUSETTS 02109
                  (617) 526-6000
</TABLE>

                            ------------------------

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon as
practicable after the effective date of this Registration Statement.

    If the securities being registered on this form are being offered in
connection with the formation of a holding company, and there is compliance with
General Instruction G, check the following box: [ ]

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ] -------------------

    If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ] -------------------
                            ------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------
                                                           PROPOSED MAXIMUM        PROPOSED MAXIMUM
    TITLE OF EACH CLASS OF           AMOUNT TO BE         OFFERING PRICE PER      AGGREGATE OFFERING          AMOUNT OF
 SECURITIES TO BE REGISTERED        REGISTERED(1)              SHARE(1)                PRICE(1)            REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>                     <C>                     <C>                     <C>
Common Stock, par value
$.01..........................    89,889,354 Shares            $.78125              $70,226,057.81            $18,539.67
- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Estimated solely for the purpose of computing the amount of the registration
    fee pursuant to Rule 457(f) under the Securities Act.
                            ------------------------

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2

[ARCH LOGO]                                                       [PAGENET LOGO]

                                                                          , 2000

Dear Arch and PageNet Stockholders:

     The accompanying joint proxy statement/prospectus describes the proposed
merger of Arch Communications Group, Inc. and Paging Network, Inc. and related
restructurings. As a result of the merger, PageNet will become a wholly owned
subsidiary of Arch.

     The stockholders of Arch and PageNet will vote to approve matters related
to the proposed merger and related transactions at special meetings to be held
on [DATE], 2000 and [DATE], 2000, respectively.

     The Arch and PageNet board of directors have determined that the merger and
the merger agreement are fair to, and in the best interest of, their respective
companies and their respective stockholders. Each board of directors unanimously
recommends that its company's stockholders approve all proposals on which they
are entitled to vote.

     We are very excited by the opportunities we envision for the combined
company, which will be named Arch Communications Group, Inc. Among other
significant benefits, the merger will give the combined company approximately
16.0 million units in service throughout North America and enhance our ability
to provide customers with access to an expanded range of wireless products and
services.

     The merger agreement requires a financial restructuring of each company
immediately prior to the merger. In the restructurings, Arch will make an
exchange offer of shares of Arch common stock for all of its senior discount
notes, which had an accreted value of approximately $394 million as of December
31, 1999. Arch also proposes to convert all outstanding shares of Series C
convertible preferred stock, with a liquidation value of approximately $28
million as of December 31, 1999, into shares of its common stock. PageNet will
make an exchange offer of PageNet common stock for PageNet senior subordinated
notes having an aggregate outstanding principal amount of approximately $1.2
billion. In the merger, owners of common stock of Arch and PageNet will receive
common stock in the combined company, with shareholders of Arch retaining one
share of common stock in the combined company for each share they currently own,
and shareholders of PageNet, including PageNet noteholders who exchange their
notes for PageNet stock, receiving 0.1247 shares of common stock in the combined
company for each share of PageNet stock they own.

     If the proposals receive all necessary approvals, the other conditions to
the merger are satisfied or, if legally permissible waived, the merger is
expected to be consummated during the      quarter of 2000.

     The accompanying joint proxy statement/prospectus provides detailed
information about Arch, PageNet, the merger and the related transactions. Please
give all of this information your careful attention. IN PARTICULAR, YOU SHOULD
CAREFULLY CONSIDER THE DISCUSSION IN THE SECTION ENTITLED "RISK FACTORS"
BEGINNING ON PAGE 9 OF THE JOINT PROXY STATEMENT/PROSPECTUS.

        IF YOU ARE AN ARCH STOCKHOLDER, you only need to vote your
        shares. The only document that you will receive is this joint
        proxy statement/prospectus. To vote your shares, please use the
        enclosed proxy card. Please read the instructions on the proxy
        card and fill out the proxy card accordingly. To approve the
        proposals relating to the merger, you must vote "FOR" each
        proposal.

        IF YOU ARE AN ARCH STOCKHOLDER AND AN ARCH NOTEHOLDER, you will
        need to vote your shares and also respond to Arch's note
        exchange offer. You will receive this joint proxy
        statement/prospectus and a separate note exchange prospectus. To
        vote your shares, please use the enclosed proxy card. Please
        read the instructions on the enclosed proxy card included in the
        proxy statement/prospectus and fill out the proxy card
        accordingly. To approve the proposals relating to the merger,
        you must vote "FOR" each proposal. Also, in
<PAGE>   3

        order to respond to Arch's note exchange offer, please read the
        instructions on the letter of transmittal included in the note exchange
        prospectus and fill out the letter of transmittal accordingly.

        IF YOU ARE A PAGENET STOCKHOLDER, you will need to vote your
        shares and also respond to PageNet's solicitation of consents to
        its prepackaged plan of reorganization. You will receive this
        joint proxy statement/prospectus and a separate prospectus from
        PageNet. To vote your shares, please use the enclosed proxy
        card. Please read the instructions on the enclosed proxy card
        and fill out the proxy card accordingly. To approve the
        proposals relating to the merger, you must vote "FOR" each
        proposal. Also, in order to respond to PageNet's consent
        solicitation for the prepackaged plan of reorganization, please
        read the "Noteholder and Stockholder Actions" section of
        PageNet's separate prospectus and fill out the appropriate
        ballot that accompanies PageNet's prospectus.

        IF YOU ARE A PAGENET STOCKHOLDER AND A PAGENET NOTEHOLDER, you
        will need to vote your shares, respond to PageNet's solicitation
        of consents to its prepackaged plan of reorganization, and
        respond to PageNet's note exchange offer. You will receive this
        joint proxy statement/prospectus and a separate prospectus from
        PageNet. To vote your shares, please use the enclosed proxy
        card. Please read the instructions on the enclosed proxy card
        and fill out the proxy card accordingly. To approve the
        proposals relating to the merger, you must vote "FOR" each
        proposal. Also, in order to respond to PageNet's note exchange
        offer and PageNet's consent solicitation for the prepackaged
        plan of reorganization, please read the "Noteholder and
        Stockholder Actions" section of PageNet's separate prospectus
        and fill out the appropriate ballot and letter of transmittal
        that accompany PageNet's prospectus.

     The approval of each proposal is conditioned upon approval of the others.
Accordingly, a vote against any proposal on which you are entitled to vote will
have the same effect as a vote against all. Your vote is important regardless of
the number of shares you own. We urge you to vote FOR each proposal, as each is
a necessary step in the merger of Arch and PageNet.

Sincerely,

/s/ C. Edward Baker, Jr.                  /s/ C. Edward Baker, Jr.

C. Edward Baker, Jr.                      John P. Frazee, Jr.
Chairman of the Board                     Chairman of the Board of Directors and
and Chief Executive Officer               Chief Executive Officer







                                        2
<PAGE>   4

                        ARCH COMMUNICATIONS GROUP, INC.
                        1800 WEST PARK DRIVE, SUITE 250
                             WESTBOROUGH, MA 01581

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                        TO BE HELD ON             , 2000

To the Stockholders of
Arch Communications Group, Inc.:

     We will hold a special meeting of stockholders of Arch on             ,
2000 at 10:00 a.m., local time, at the offices of Hale and Dorr LLP, 60 State
Street, Boston, Massachusetts 02109, for the following purposes:

     1.  To consider and vote upon a proposal to issue shares of Arch's common
         stock, $.01 par value per share, pursuant to an agreement and plan of
         merger, dated as of November 7, 1999, as subsequently amended, among
         Arch, Paging Network, Inc. and a wholly owned subsidiary of Arch.

     2.  To consider and vote upon a proposal to amend Arch's restated
         certificate of incorporation to: (1) increase the number of authorized
         shares of Arch common stock from 65,000,000 to 200,000,000 shares and
         (2) convert all of the shares of Series C convertible preferred stock
         into 2,104,142 shares of Arch common stock.

     3.  For the holders of Series C convertible preferred stock to consider and
         vote as a class upon the proposal to convert all outstanding shares of
         Series C preferred stock into 2,104,142 shares of Arch common stock.

     4.  To transact such other business as may properly come before the special
         meeting or any adjournments or postponements of the special meeting.

     Arch's board of directors has unanimously approved the merger and the
merger agreement and recommends that you vote FOR each of the proposals on which
you are entitled to vote. The approval of each of the proposals is conditioned
upon approval of the others. Accordingly, a vote against any of the proposals
will have the same effect as a vote against all.

     We have described the transactions under the merger agreement in more
detail in the accompanying joint proxy statement/prospectus, which you should
read in its entirety before voting. A copy of the merger agreement is attached
as Annex A to the joint proxy statement/prospectus.

     Only stockholders who hold shares of Arch stock at the close of business on
            , 2000 will be entitled to notice of and to vote at the special
meeting or any adjournment or postponement of the special meeting. The complete
list of Arch stockholders entitled to vote at the special meeting will be
available for examination, for purposes pertaining to the special meeting, by
any stockholder of Arch entitled to vote at the special meeting, at the
principal executive offices of Arch, 1800 West Park Drive, Suite 250,
Westborough, Massachusetts 01581, for ten days prior to the special meeting.

     At the special meeting, holders of shares of Arch's Series C preferred
stock will vote separately as a class on the proposal to convert their shares of
Series C preferred stock into shares of Arch's common stock. The approval of the
proposal will require the affirmative vote of the holders of a majority of the
outstanding shares of the Series C preferred stock.

     Holders of shares of Arch common stock, Class B common stock and Series C
preferred stock will vote together as a single class on the other proposals.
Each share of Arch common stock is entitled to one vote on the matters
presented, each share of Class B common stock is entitled to 1/100th of one
vote, and each share of Series C preferred stock is currently entitled to 6.8804
votes on all such matters.

     A quorum will exist for the separate vote by the holders of shares of
Arch's Series C preferred stock if a majority of those shares are present at the
special meeting either in person or by proxy. A quorum will exist for the other
proposals if a majority of the outstanding shares of Arch common stock, Class B
common stock and Series C preferred stock (calculated on an as-converted basis,
assuming conversion of
<PAGE>   5

all Class B common stock and Series C preferred stock, and voting together as a
single class) entitled to vote at the special meeting are present either in
person or by proxy.

     Assuming a quorum is present, the approval of the issuance of shares of
Arch common stock pursuant to the merger agreement will require the affirmative
vote of the holders of a majority of the votes which are entitled to be cast by
the holders of shares present and voting. The adoption of the amendments to the
certificate of incorporation will require the affirmative vote of the holders of
a majority of the votes which are entitled to be cast by the holders of all
shares of Arch common stock, Class B common stock and Series C stock, whether
present or not at the special meeting. Holders of Arch common stock, Class B
common stock and Series C preferred stock do not have rights of appraisal under
Delaware law in connection with the merger.

     YOUR VOTE IS IMPORTANT REGARDLESS OF THE NUMBER OF SHARES YOU OWN. TO
ENSURE THAT YOUR SHARES ARE REPRESENTED AT THE SPECIAL MEETING, WE URGE YOU TO
COMPLETE, DATE AND SIGN THE ENCLOSED PROXY AND MAIL IT PROMPTLY IN THE
POSTAGE-PAID ENVELOPE PROVIDED WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL
MEETING IN PERSON. YOU MAY REVOKE YOUR PROXY IN THE MANNER DESCRIBED IN THE
PROXY STATEMENT/PROSPECTUS AT ANY TIME BEFORE IT HAS BEEN VOTED AT THE SPECIAL
MEETING. YOU MAY VOTE AT THE SPECIAL MEETING EVEN IF YOU HAVE RETURNED A PROXY.

                                             By order of the Board of Directors,

                                             /s/ C. Edward Baker, Jr.

                                             C. Edward Baker, Jr.
                                             Chairman of the Board and
                                             Chief Executive Officer

               , 2000
Westborough, MA

                                        2
<PAGE>   6

                              PAGING NETWORK, INC.
                               14911 QUORUM DRIVE
                              DALLAS, TEXAS 75240

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                        TO BE HELD ON             , 2000

To the Stockholders of
Paging Network, Inc.:

     We will hold a special meeting of stockholders of PageNet on             ,
2000 at 10:00 a.m. local time, at [ADDRESS], for the following purposes:

     1.  To consider and vote upon a proposal to adopt a merger agreement among
         Arch, Paging Network, Inc. and St. Louis Acquisition Corp., a wholly
         owned subsidiary of Arch.

     2.  To consider and vote upon a proposal to amend PageNet's restated
         certificate of incorporation to increase the number of authorized
         shares of PageNet common stock from 250,000,000 to 750,000,000 shares.

     3.  To consider and vote upon a proposal to issue shares of PageNet's
         common stock in an amount sufficient to complete the exchange offer to
         holders of PageNet senior subordinated notes as contemplated by the
         merger agreement.

     4.  To transact such other business as may properly come before the special
         meeting or any adjournments or postponements of the special meeting.

     PageNet's board of directors has unanimously approved the merger and the
merger agreement and recommends that you vote FOR each of the proposals on which
you are entitled to vote. The approval of each of the proposals is conditioned
upon approval of the others. Accordingly, a vote against any of the proposals
will have the same effect as a vote against all.

     We have described the transactions under the merger agreement in more
detail in the accompanying joint proxy statement/prospectus, which you should
have read in its entirety before voting. A copy of the merger agreement is
attached as Annex A to the joint proxy statement/prospectus.

     Only stockholders who hold shares of PageNet common stock at the close of
business on             , 2000 will be entitled to notice of and to vote at the
special meeting or any adjournment or postponement of the special meeting. The
complete list of PageNet stockholders entitled to vote at the special meeting
will be available for examination, for purposes pertaining to the special
meeting, by any stockholder of PageNet entitled to vote at the special meeting,
at the principal executive offices of PageNet, 14911 Quorum Drive, Dallas, Texas
75240, for ten days prior to the special meeting.

     Each share of PageNet common stock is entitled to one vote on the matters
presented. A quorum will exist if a majority of the outstanding shares of
PageNet common stock entitled to vote at the special meeting are present either
in person or by proxy.

     The adoption of the merger agreement and the adoption of the amendment to
the restated certificate of incorporation will require the affirmative vote of
the holders of a majority of all shares of PageNet common stock outstanding and
entitled to vote, whether present or not at the special meeting. Assuming a
quorum is present, the approval of the issuance of shares of PageNet common
stock in an amount sufficient to complete the PageNet exchange offer will
require the affirmative vote of the holders of a majority of the shares present.
Holders of PageNet common stock do not have rights of appraisal under Delaware
law in connection with the merger.

     YOUR VOTE IS IMPORTANT REGARDLESS OF THE NUMBER OF SHARES YOU OWN. TO
ENSURE THAT YOUR SHARES ARE REPRESENTED AT THE SPECIAL MEETING, WE URGE YOU TO
COMPLETE, DATE AND SIGN THE ENCLOSED PROXY AND MAIL IT PROMPTLY IN THE
POSTAGE-PAID ENVELOPE PROVIDED WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL
MEETING IN
<PAGE>   7

PERSON. YOU MAY REVOKE YOUR PROXY IN THE MANNER DESCRIBED IN THE JOINT PROXY
STATEMENT/PROSPECTUS AT ANY TIME BEFORE IT HAS BEEN VOTED AT THE SPECIAL
MEETING. YOU MAY VOTE AT THE SPECIAL MEETING EVEN IF YOU HAVE RETURNED A PROXY.

                                             By order of the Board of Directors,

                                             /s/ C. Edward Baker, Jr.

                                             John P. Frazee, Jr.
                                             Chairman of the Board of Directors
                                             and Chief Executive Officer

               , 2000
Dallas, TX

                                        2
<PAGE>   8

        THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.
        WE MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED
        WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS
        PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IT IS NOT
        SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER
        OR SALE IS NOT PERMITTED.

                 SUBJECT TO COMPLETION, DATED JANUARY 28, 2000

[ARCH LOGO]                                                       [PAGENET LOGO]
                    PROPOSED MERGER - YOUR VOTE IS IMPORTANT

    This joint proxy statement/prospectus describes the proposed merger of Arch
Communications Group, Inc. and Paging Network, Inc. and related financial
restructurings.

    Through the merger, PageNet will become a wholly owned subsidiary of Arch.
PageNet stockholders will receive 0.1247 shares of Arch common stock for every
share of PageNet common stock they own. Concurrently:

    -  Arch is offering to exchange 66.1318 shares of its common stock for each
       $1,000 principal amount at maturity of Arch's outstanding 10 7/8% senior
       discount notes.

    -  PageNet is offering to exchange a number of shares of its common stock
       which is equivalent to approximately 63 or 64 shares of Arch common
       stock, as well as common stock of Vast Solutions, Inc., a PageNet
       subsidiary, for each $1,000 principal amount of PageNet's outstanding
       senior notes (the exact exchange ratio will depend on how much interest
       accrues on the notes prior to closing).

    -  Each outstanding share of Arch's Series C convertible preferred stock is
       proposed to be converted into approximately 8.4 shares of Arch common
       stock.

    -  Arch will replace its existing credit facilities with approximately $1.3
       billion of bank debt.

    Following the merger, Arch's current stockholders will hold at least 29.6%
of the combined company's stock, and the current stockholders of PageNet will
hold at least 7.5%. They will hold correspondingly larger percentages if less
than all of the notes are exchanged for stock in the exchange offers.

    In certain circumstances, PageNet and some of its operating subsidiaries may
commence cases under chapter 11 of the Bankruptcy Code and seek to confirm a
prepackaged plan of reorganization that would bind PageNet's noteholders and
stockholders to the terms of the merger and the PageNet exchange offer.

    We expect the merger to be non-taxable for federal income tax purposes to
Arch, PageNet and their stockholders, except for a concurrent distribution of
Vast common stock to PageNet stockholders.

    The stockholders of Arch and PageNet will vote to approve matters related to
the merger on     , 2000 [and     , 2000, respectively]. For information about
the meetings, see the accompanying notices. EACH COMPANY'S BOARD OF DIRECTORS
UNANIMOUSLY URGES ITS STOCKHOLDERS TO VOTE IN FAVOR OF ALL PROPOSALS.

    Following the merger, Arch's board of directors is expected to consist of
six nominees of the current Arch directors, three nominees of the current
PageNet directors and up to three nominees of PageNet's three largest creditors.

    Whether or not you plan to attend your stockholder meeting, please take the
time to vote on the meeting proposals by signing, dating and mailing your
enclosed proxy card and ballot, or vote by telephone, fax or the Internet
following the instructions on the proxy card and ballot. REGARDLESS OF THE
NUMBER OF SHARES YOU OWN, YOUR VOTE IS VERY IMPORTANT. PLEASE ACT TODAY.

WE ENCOURAGE YOU TO READ THIS DOCUMENT CAREFULLY. Thank you for your support.

    Arch's common stock and PageNet's common stock are traded on the Nasdaq
National Market under the symbols "APGR" and "PAGE".

<TABLE>
<CAPTION>
<S>                                             <C>                                        <C>
- ------------------------------------------      ----------------------------------------------
  NEITHER THE SEC NOR ANY STATE SECURITIES      WE URGE YOU TO CAREFULLY READ THE "RISK
  REGULATORS HAVE APPROVED OR DISAPPROVED         FACTORS" SECTION BEGINNING ON PAGE 9
  THE SHARES OR THE EXCHANGE OFFER OR             BEFORE YOU MAKE ANY INVESTMENT DECISION.
  DETERMINED IF THIS JOINT PROXY
  STATEMENT/PROSPECTUS IS ACCURATE OR
  ADEQUATE. ANYONE WHO TELLS YOU OTHERWISE
  IS COMMITTING A CRIME.
- ------------------------------------------      ----------------------------------------------
</TABLE>

    THE DATE OF THIS JOINT PROXY STATEMENT/PROSPECTUS IS             , 2000.
<PAGE>   9

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Summary...............................     1
Arch and PageNet......................     1
  The Merger..........................     2
  The Spin-Off Distribution...........     7
  The Prepackaged Plan of
     Reorganization...................     7
  Stock Ownership in the Combined
     Company..........................     8
Risk Factors..........................     9
  Risks Related to the Merger and an
     Investment in Arch's Common
     Stock............................     9
  Arch's Business and Financial
     Risks............................    12
  Risks Related to PageNet............    17
  Risks Related to Vast...............    19
  Risks Related to Possible Bankruptcy
     Cases............................    19
Forward-Looking Statements............    21
Selected Pro Forma Financial and
  Operating Data......................    22
The Merger............................    25
  General.............................    25
  Background of the Merger............    25
  Arch's Reasons for the Merger;
     Recommendation of Arch's Board of
     Directors........................    28
  PageNet's Reasons for the Merger;
     Recommendation of PageNet's Board
     of Directors.....................    30
  Opinion of Financial Advisor to
     Arch.............................    32
  Opinions of Financial Advisors to
     PageNet..........................    35
     Opinion of Houlihan, Lokey,
       Howard & Zukin Capital.........    35
     Opinion of Goldman, Sachs &
       Co.............................    38
     Opinion of Morgan Stanley Dean
       Witter.........................    40
  Interests of Certain Persons in the
     Merger...........................    42
  Treatment of PageNet's Common
     Stock............................    44
  The Exchange Offers.................    44
  Regulatory Approvals................    45
  Material Federal Income Tax
     Considerations...................    46
  Accounting Treatment of the
     Merger...........................    46
  Quotation on Nasdaq National Market
     System...........................    46
</TABLE>

<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
  Resales of Arch Common Stock Issued
     in Connection with the Merger;
     Affiliate Agreements.............    46
  No Appraisal Rights.................    47
  PageNet Bankruptcy Cases............    47
The Merger Agreement..................    48
  Structure of the Merger.............    48
  The Exchange Ratio and Treatment of
     PageNet Common Stock.............    48
  Exchange Procedures.................    48
  Treatment of PageNet Stock
     Options..........................    49
  Representations and Warranties......    50
  Covenants...........................    51
  Conditions to Completion of the
     Merger...........................    55
  Termination of the Merger
     Agreement........................    57
  Termination Fee.....................    59
  Modification or Amendment of the
     Merger Agreement.................    60
The Spin-Off Distribution.............    61
The Prepackaged Plan of
  Reorganization......................    62
  Classification of Claims and Equity
     Interests under the Plan.........    62
Material Federal Income Tax
  Considerations......................    66
Capitalization........................    70
Unaudited Pro Forma Condensed
  Consolidated Financial Statements...    71
Notes to Unaudited Pro Forma Condensed
  Consolidated Financial Statements...    75
Selected Historical Consolidated
  Financial and Operating
  Data -- Arch........................    79
Arch Management's Discussion and
  Analysis of Financial Condition and
  Results of Operations...............    82
Selected Historical Consolidated
  Financial and Operating
  Data -- MobileMedia.................    94
MobileMedia Management's Discussion
  and Analysis of Financial Condition
  and Results of Operations...........    97
Selected Historical Consolidated
  Financial and Operating
  Data -- PageNet.....................   108
PageNet Management's Discussion and
  Analysis of Financial Condition and
  Results of Operations...............   111
Market Price Information and Dividend
  Policy..............................   120
</TABLE>

                                        i
<PAGE>   10

<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Comparative Price Information.........   120
  Dividend Policy.....................   120
Comparative Historical and Unaudited
  Pro Forma Per Share Data............   121
Industry Overview.....................   122
  Regulation..........................   123
Arch's Business.......................   127
  Business Strategy...................   127
  Wireless Communications Services,
     Products and Operations..........   128
  Networks and Licenses...............   130
  Subscribers and Marketing...........   131
  Sources of Equipment................   132
  Competition.........................   132
  Employees...........................   133
  Trademarks..........................   133
  Properties..........................   133
  Litigation..........................   134
  The Company.........................   134
Arch's Management.....................   135
Arch's Principal Stockholders.........   141
PageNet's Business....................   145
PageNet's Management..................   150
PageNet's Principal Stockholders......   156
The Combined Company..................   158
Description of Arch's Equity
  Securities..........................   161
Description of Indebtedness...........   167
</TABLE>

<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Comparison of Rights of PageNet
  Stockholders and Arch
  Stockholders........................   173
Arch's Special Meeting................   185
PageNet's Special Meeting.............   188
Stockholder Proposals.................   191
Legal Matters.........................   192
Experts...............................   192
Where You Can Find More Information...   192
Index to Financial Statements.........   F-1
Annex A -- Agreement and Plan of
  Merger among Paging Network, Inc.,
  Arch Communications Group, Inc. and
  St. Louis Acquisition Corp., dated
  November 7, 1999, as subsequently
  amended (composite copy)............
Annex B -- Opinion of Bear Stearns &
  Co., Inc............................   B-1
Annex C -- Opinion of Houlihan Lokey
  Howard & Zukin Capital..............   C-1
Annex D -- Opinion of Goldman, Sachs &
  Co..................................   D-1
Annex E -- Opinion of Morgan Stanley
  Dean Witter.........................   E-1
Annex F -- Prospectus of Vast
  Solutions, Inc......................
Annex G -- Arch Credit Facilities Term
  Sheet...............................   G-1
Annex H -- Unaudited Combined Company
  Projections.........................   H-1
</TABLE>

     "Arch" and "Arch Paging" are service marks of Arch. "MobileComm" is a
registered service mark of Arch, and the mark is not associated with MobilComm
Inc. of Cincinnati, Ohio. "PageNet" is a registered mark of PageNet. Other
trademarks, service marks and trade names used in this proxy statement/
prospectus are owned by persons who are not associated with Arch or PageNet.
                                       ii
<PAGE>   11

                                    SUMMARY

     This summary highlights selected information contained elsewhere in this
joint proxy statement/prospectus. It may not contain all of the information that
is important to you. We urge you to read the entire joint proxy
statement/prospectus, including "Risk Factors", and all of the information
incorporated by reference into the joint proxy statement/prospectus. We use the
name "Arch" to refer to Arch Communications Group, Inc. and its consolidated
subsidiaries both before and after the proposed merger. We use the name
"PageNet" to refer to Paging Network, Inc. and its consolidated subsidiaries.
Sometimes we use the phrase "combined company" when we wish to emphasize that we
are referring specifically to Arch after the proposed merger with PageNet. We
use the name "Vast" to refer to Vast Solutions, Inc., a wholly owned subsidiary
of PageNet. Arch has supplied all information about Arch contained in this joint
proxy statement/prospectus, and PageNet has supplied all information about
PageNet and Vast.

     All share information in this joint proxy statement/prospectus reflects a
1-for-3 reverse stock split effected by Arch during June 1999. All references to
percentages of Vast's equity are subject to dilution if Vast issues additional
equity to third parties.

                                ARCH AND PAGENET

ARCH

     Arch is a leading provider of wireless communications services, primarily
wireless messaging services, in the United States based on its net revenues and
its approximately 6.9 million units in service. This reflects Arch's acquisition
of MobileMedia Communications, Inc. and its subsidiaries on June 3, 1999. Arch:

     - operates in all 50 states and all of the 100 most populated metropolitan
       markets in the United States through its sales offices, nationwide retail
       distribution network, company-owned retail stores and resellers;

     - offers local, regional and nationwide services employing digital networks
       covering more than 90% of the United States population;

     - offers messaging services, including digital display, alphanumeric
       display, 2-way messaging, which allows subscribers to respond to messages
       with original or pre-scripted replies, and 1.5-way messaging or
       guaranteed messaging, which enables subscribers to know that their
       messages were delivered; and

     - offers enhanced or complementary wireless communications services, such
       as stock quotes, news and other wireless information delivery services,
       voice mail, personalized greeting, message storage and retrieval,
       equipment loss protection and equipment maintenance.

     Arch's operating objectives are to increase its EBITDA, or earnings before
interest, taxes, depreciation and amortization; deploy its capital efficiently;
reduce its financial leverage; and expand its customer relationships. To achieve
its operating objectives, Arch:

     - has selected a low-cost operating strategy as its principal competitive
       tactic;

     - is reducing its financial leverage by reducing capital requirements and
       increasing EBITDA;

     - is distributing its products and services through several different
       channels; and

     - is pursuing new revenue opportunities, including applications in
       narrowband personal communications services, which are commonly referred
       to as N-PCS.

     Arch's principal office is located at 1800 West Park Drive, Suite 250,
Westborough, Massachusetts 01581. Arch's telephone number is (508) 870-6700.

                                        1
<PAGE>   12

     Arch's web site, www.arch.com, is not part of this joint proxy
statement/prospectus.

PAGENET

     PageNet is a leading provider of wireless communications services
throughout the United States and the U.S. Virgin Islands, Puerto Rico and
Canada, with approximately 9.1 million units in service. PageNet:

     - provides services in all 50 states and the District of Columbia,
       including the 100 most populated metropolitan markets in the United
       States, and to more than 75% of the population of Canada;

     - offers two primary types of wireless messaging services which comprise
       99.7% of its business: digital display messaging and alphanumeric display
       messaging;

     - offers enhanced wireless communications services, such as stock quotes,
       news and other wireless information delivery services, voice mail,
       personalized greeting, message storage and retrieval and equipment loss
       and damage protection; and

     - has begun to market and sell "advanced" messaging services, consisting of
       1.5-way services, 1.75-way services, which enable subscribers to respond
       to messages with pre-scripted replies, and 2-way services.

     Through its wholly owned subsidiary Vast, PageNet is commencing operations
that can provide integrated wireless solutions to connect businesses with their
employees, customers and remote assets, such as vending machines, automobiles
and storage tanks. Using an expandable software platform, provisioning and
service and support operations, Vast believes it will be able to provide
customers with a comprehensive end-to-end wireless solution that seamlessly
connects their mobile users with the Internet or corporate data network using
wireless devices. Vast's products and services are intended to enable
corporations to employ a more personalized and powerful wireless data solution.

     Vast is a development stage company and, since its inception, has been
engaged primarily in product research and development and developing markets for
its products and services. Vast has incurred significant operating losses as a
result of its start-up activities. It began to market its products and services
in late 1999, and believes that revenues from sales of these products and
services will grow rapidly.

     PageNet's principal office is located at Corporate Centre, 14911 Quorum
Drive, Dallas, Texas 75240. PageNet's telephone number is (972) 801-8000.

     PageNet's website, www.pagenet.com, is not part of this joint proxy
statement/prospectus.

                                   THE MERGER

     Arch and PageNet have agreed to merge on the terms set forth in an
agreement and plan of merger dated November 7, 1999, as subsequently amended.
The merger agreement, as amended, is attached to this joint proxy
statement/prospectus as Annex A. We encourage you to read the merger agreement
as it is the legal document that governs the merger.

TERMS OF THE MERGER (PAGE 25)

     As a result of the merger, PageNet will become a wholly owned subsidiary of
Arch. The merger will be accompanied by a recapitalization of Arch and PageNet
involving the exchange of debt for common stock in the Arch and PageNet exchange
offers, as described in "The Merger -- The Exchange Offers". Arch also proposes
to convert shares of its Series C preferred stock into shares of Arch common
stock in connection with the merger.

     The merger agreement provides that each share of PageNet common stock,
including shares issued to PageNet noteholders in the PageNet exchange offer,
will be converted into 0.1247 shares of Arch common stock.

                                        2
<PAGE>   13

STOCK OWNERSHIP AND GOVERNANCE FOLLOWING THE MERGER (PAGES 8, 141 AND 159)

     If the Arch and PageNet exchange offers are fully subscribed, the merger
and the related exchange offers and the proposed conversion of Arch's Series C
preferred stock will result in Arch's outstanding common stock being held

     - 29.6% by Arch's existing stockholders;

     - 17.2% by the existing holders of Arch's 10 7/8% senior discount notes;

     - 1.2% by the existing holders of Arch's Series C preferred stock;

     - 44.5% by the existing holders of PageNet's senior subordinated notes; and

     - 7.5% by the existing holders of PageNet's common stock.

     The capitalization of the combined company following the merger is expected
to be significantly leveraged, although less heavily leveraged than the current
capitalization of Arch and PageNet. See "-- Stock Ownership in the Combined
Company" and "Capitalization".

     After the merger, the Arch board of directors will consist of 12 directors.
Six directors will be designated by the current Arch directors and three
directors will be designated by the current PageNet directors. Each of the three
largest holders of PageNet notes being exchanged for shares of PageNet common
stock may designate one director. To the extent any of these three largest
holders do not designate directors, the Arch directors will designate additional
directors.

REQUIRED STOCKHOLDER APPROVALS; STOCKHOLDER MEETINGS (PAGE 52)

     Approval of various matters that must be submitted to a vote of
stockholders in order to effect the merger will require obtaining the
affirmative vote of the holders of a majority of the combined voting power of
all classes of Arch's outstanding capital stock, a majority of PageNet's
outstanding common stock and, in some cases, a majority of Arch's outstanding
Series C preferred stock. If PageNet files for reorganization under chapter 11
of the United States Bankruptcy Code, the approval of the holders of PageNet
common stock would no longer be required.

     Stockholder meetings for Arch and PageNet will be held on             ,
2000 [and             , 2000, respectively]. Officers and directors of Arch and
their affiliates who beneficially own a total of approximately [     ]% of the
outstanding voting power of Arch have indicated an intention to vote in favor of
all matters related to the merger. Officers and directors of PageNet and their
affiliates beneficially own a total of approximately [     ]% of the outstanding
voting power of PageNet.

BACKGROUND OF MERGER; RECOMMENDATION TO STOCKHOLDERS (PAGE 25)

     THE ARCH AND PAGENET BOARDS OF DIRECTORS HAVE UNANIMOUSLY VOTED TO APPROVE
THE MERGER AGREEMENT AND THE MERGER. EACH BOARD OF DIRECTORS BELIEVES THAT THE
MERGER IS ADVISABLE AND IN THE BEST INTEREST OF ITS STOCKHOLDERS AND RECOMMENDS
THAT ITS STOCKHOLDERS VOTE TO APPROVE ALL MATTERS CONCERNING THE MERGER
AGREEMENT AND RELATED TRANSACTIONS.

OPINIONS OF FINANCIAL ADVISORS (PAGE 32)

     In deciding to approve the merger, Arch's board of directors received an
opinion from its financial advisor as to the fairness, from a financial point of
view, of the exchange ratio to be used in the merger to Arch and its
stockholders. The full text of the opinion of Bear, Stearns & Co., Inc. to Arch
is attached as Annex B to this joint proxy statement/prospectus. In deciding to
approve the merger, PageNet's board of

                                        3
<PAGE>   14

directors received the oral opinions of Houlihan, Lokey, Howard & Zukin Capital
and Morgan Stanley Dean Witter, subsequently confirmed in writing that, as of
November 7, the consideration to be received by the holders of PageNet common
stock on such date pursuant to the merger and the Vast spin-off, taken as a
whole, was fair from a financial point of view to such holders and the oral
opinion of Goldman, Sachs & Co., subsequently confirmed in writing, that, as of
November 7, the exchange ratio pursuant to the merger agreement was fair from a
financial point of view to the holders of PageNet common stock as of such date.
The full texts of the opinions of each of Houlihan Lokey, Goldman Sachs and
Morgan Stanley to PageNet are attached as Annexes C, D and E, respectively. Each
opinion should be read carefully in its entirety. Each opinion is addressed to
Arch's or PageNet's board of directors and does not constitute a recommendation
to any stockholders with respect to matters relating to the merger or any
related matter.

     The engagement letters for all of Arch's and PageNet's financial advisors
provide that part of their fees will not be paid unless the merger takes place.
Regardless of whether the merger is consummated, all of the financial advisors
will be reimbursed for reasonable fees and disbursements of counsel and
reasonable travel and other out-of-pocket expenses and indemnified to the full
extent of the law against certain liabilities, including liabilities under the
federal securities laws, arising out of their engagement or the merger.

OTHER REQUIRED APPROVALS; POSSIBLE PREPACKAGED BANKRUPTCY CASES (PAGES 7, 45, 53
AND 62)

     Both Arch and PageNet have agreed to solicit consents to the amendment of
the series of notes being exchanged in the Arch and PageNet exchange offers to
eliminate all covenants that can be modified or eliminated by a majority vote.
Holders of Arch notes are required to consent to the amendment of the notes as a
condition of tendering notes in the Arch exchange offer.

     In certain circumstances, PageNet and some of its operating subsidiaries
may commence cases under chapter 11 of the Bankruptcy Code and seek to confirm a
prepackaged plan of reorganization that would bind PageNet's noteholders and
stockholders to the terms of the merger and the PageNet exchange offer.

     PageNet has agreed to solicit consents from its bank creditors, holders of
its notes to be exchanged in the PageNet exchange offer, and its stockholders to
a consensual or prepackaged plan of reorganization of PageNet and its
subsidiaries consistent with the terms of the merger agreement. Holders of
PageNet notes are required to consent to the prepackaged plan of reorganization
and amendment of the notes as a condition of tendering notes in the PageNet
exchange offer.

     If less than 97.5% of the PageNet notes are tendered in the PageNet
exchange offer, or if the stockholders of PageNet fail to approve the merger
agreement, PageNet has agreed that it will either commence bankruptcy cases
under chapter 11 of the Bankruptcy Code and file the prepackaged plan as a plan
of reorganization under chapter 11 of the Bankruptcy Code or pay Arch a $40.0
million termination fee if:

     - Arch stockholders have approved the transaction;

     - 97.5% of the Arch notes have been tendered for exchange in the Arch
       exchange offer, or 67.0% have been tendered in specified circumstances;

     - the holders of at least 66 2/3% in principal amount of the PageNet notes
       that constitute at least a majority in number of all such holders have
       consented to the prepackaged plan;

     - sufficient debt financing has been arranged to fund PageNet's operations
       until the prepackaged plan is approved; and

     - senior credit facilities of at least $1.3 billion have been secured or
       can be secured through the prepackaged plan.

     If PageNet elects to complete the merger through use of the chapter 11
process, it will commence the chapter 11 cases and also file and seek to confirm
and consummate the prepackaged plan. The merger, if

                                        4
<PAGE>   15

effected pursuant to the prepackaged plan, will be implemented differently from
the way it would be effected outside of the chapter 11 cases.

CONDITIONS TO THE MERGER (PAGE 55)

     Consummating the merger and the related exchange offers is subject to a
number of conditions, including:

     - tender and acceptance of at least 97.5% of the PageNet notes and at least
       97.5% of the Arch notes for common stock in the exchange offers, unless
       PageNet elects to reduce the required minimum percentage of Arch notes to
       any amount or Arch elects in specified circumstances to reduce such
       percentage to 67.0% or more;

     - approval of the transaction by Arch's stockholders;

     - either:

          - approval of the merger agreement and certain related matters by
            PageNet's stockholders; or

          - entry of a final confirmation order by the bankruptcy court
            confirming the prepackaged plan;

     - receipt of all necessary governmental approval and the expiration or
       termination of all applicable waiting periods, and any extensions of
       these periods, under the Hart-Scott-Rodino Act;

     - the receipt of legal opinions regarding the treatment of the merger as a
       tax-free reorganization; and

     - other customary contractual conditions specified in the merger agreement.

Some of the conditions to the merger may be waived by the party entitled to
assert such conditions.

NO SOLICITATION OF ALTERNATIVE OFFERS (PAGE 51)

     With specified exceptions and subject to their boards of directors'
fiduciary obligations to recommend any superior proposal to their stockholders,
both Arch and PageNet have agreed not to solicit or encourage any proposal from
a third party involving an acquisition, business combination or other similar
proposal, prior to the merger.

TERMINATION OF THE MERGER AGREEMENT (PAGE 57)

     Arch and PageNet can mutually agree to terminate the merger agreement and
either Arch or PageNet can terminate the merger agreement upon the occurrence of
a number of events, including if:

     - the other party breaches any material representation, warranty or
       covenant in the merger agreement and either cannot cure or fails to cure
       the breach;

     - the merger does not take place by June 30, 2000 or, if a prepackaged
       bankruptcy case is filed prior to June 30, 2000, within 150 days after
       such filing;

     - the Arch stockholders do not approve the proposals relating to the
       merger; or

     - the PageNet stockholders do not approve the merger and the bankruptcy
       court does not enter a final confirmation order confirming the
       prepackaged plan.

     If the merger agreement is terminated after one party pursues an
alternative offer or under other specified circumstances, either Arch or PageNet
may be required to pay a termination fee of $40.0 million.

                                        5
<PAGE>   16

INTERESTS OF EXECUTIVE OFFICERS AND DIRECTORS OF PAGENET IN THE MERGER (PAGE 42)

     In considering the recommendation of the PageNet board of directors, you
should be aware of the interests that PageNet executive officers and directors
have in the merger. These include:

     - enhanced retention and severance benefits for certain executive officers;

     - vesting of stock options, although all of such stock options currently
       have no value; and

     - customary rights to indemnification against specified liabilities.

     These interests are different from and in addition to the interests of
PageNet stockholders. In considering the fairness of the merger to PageNet
stockholders, the PageNet board of directors took these interests into account.

ACCOUNTING TREATMENT (PAGE 46)

     Arch will account for the merger using the purchase method of accounting,
which means that the assets and liabilities of PageNet, including intangible
assets, will be recorded at their fair value and the results of operations of
PageNet will be included in Arch's results beginning on the date of acquisition.

MATERIAL FEDERAL INCOME TAX CONSIDERATIONS (PAGE 46)

     The merger has been structured to qualify as a tax free reorganization
under the Internal Revenue Code. Arch, PageNet, and their stockholders should
not recognize gain or loss in connection with the merger, except that the
distribution and receipt of Class B common stock of Vast described under "-- The
Spin-Off Distribution" is expected to be taxable to PageNet and its
stockholders.

     TAX MATTERS ARE VERY COMPLICATED, AND THE TAX CONSEQUENCES OF THE MERGER TO
STOCKHOLDERS WILL DEPEND ON THE FACTS OF THE STOCKHOLDER'S OWN SITUATION.
STOCKHOLDERS SHOULD CONSULT THEIR TAX ADVISORS FOR A FULL UNDERSTANDING OF THE
TAX CONSEQUENCES OF THE MERGER TO THEM.

ARCH AND PAGENET STOCKHOLDERS HAVE NO APPRAISAL RIGHTS (PAGE 47)

     Under Delaware law, Arch and PageNet stockholders do not at present have
appraisal rights. However, if PageNet's common stock is delisted from the Nasdaq
National Market System, stockholders may have appraisal rights. PageNet has been
notified of a potential delisting of its common stock from the Nasdaq National
Market System. See "Risk Factors -- PageNet may be delisted from the Nasdaq
National Market System and the Chicago Stock Exchange prior to completion of the
merger, resulting in reduced trading liquidity for the shares of its common
stock".

HOW THE RIGHTS OF PAGENET STOCKHOLDERS WILL DIFFER AFTER THEY BECOME ARCH
STOCKHOLDERS (PAGE 173)

     The rights of investors as stockholders of Arch after the merger will be
governed by Arch's charter and bylaws. Those rights differ from the rights of
PageNet stockholders under PageNet's charter and by-laws.

PRICE AND OTHER INFORMATION (PAGE 120)

     Shares of Arch common stock are traded on the Nasdaq National Market
System. On November 5, 1999, the last full trading day prior to the public
announcement of the proposed merger, Arch common stock closed at $6.8125 per
share. On             , 2000, Arch common stock closed at $       per share.

     Shares of PageNet common stock are also traded on the Nasdaq National
Market System. On November 5, 1999, the last full trading day prior to the
public announcement of the proposed merger, PageNet common stock closed at
$0.9688 per share. On             , 2000, PageNet common stock closed at
$       per share.

REGULATORY APPROVALS (PAGE 45)

     To complete the merger, Arch and PageNet must make filings and receive
authorizations from various federal and state governmental agencies in the
United States. These filings relate to antitrust matters, transfers of control
of FCC licenses and other regulations. It is possible that some of these
governmental authorities may impose conditions for granting approval. We cannot
predict whether all the
                                        6
<PAGE>   17

required regulatory approvals will be obtained within the timeframe contemplated
by the merger agreement or without burdensome conditions.

     Pursuant to the requirements of the Hart-Scott-Rodino Act, Arch and PageNet
each filed a pre-merger notification and report form with the FTC and the
Antitrust Division of the Department of Justice on November 24, 1999. On
December 23, 1999, Arch and PageNet each received a request for additional
information and documents from the Antitrust Division. These requests extend the
waiting period during which the proposed merger may not be consummated until
twenty days after the date that PageNet and Arch substantially comply with those
requests. Arch and PageNet are proceeding to compile the information and
documents requested by the Antitrust Division and intend to submit such
information and documents as soon as reasonably practicable.

                           THE SPIN-OFF DISTRIBUTION

     The merger agreement provides that PageNet will distribute to its
stockholders 11.6% of the total equity of Vast (subject to the possibility of
dilution). In accordance with the merger agreement, the PageNet board of
directors will declare a dividend, consisting of 2,320,000 shares of Class B
common stock of Vast, payable to the persons who are PageNet stockholders
immediately prior to the acceptance of senior subordinated notes in PageNet's
exchange offer. The dividend will not be paid unless all of the conditions to
the merger have been satisfied. Because the dividend will be declared prior to
acceptance of senior subordinated notes in PageNet's exchange offer, PageNet
noteholders who become stockholders of PageNet in the PageNet exchange offer
will not be entitled to receive any portion of this distribution.

     An additional 68.9% of Vast's common stock (subject to the possibility of
dilution) will be offered to PageNet noteholders in the PageNet exchange offer
and Vast's remaining equity will be held by Arch (subject to the possibility of
dilution).

     For a description of Vast and the shares of Class B common stock of Vast,
see the prospectus of Vast attached as Annex F.

                     THE PREPACKAGED PLAN OF REORGANIZATION

     In specified circumstances, Paging Network, Inc. and some of its operating
subsidiaries may commence cases under chapter 11 of the Bankruptcy Code and seek
to confirm a joint plan of reorganization that would bind PageNet's noteholders
and stockholders to the terms of the Arch merger and the related exchange
offers. See "The Merger Agreement -- Conditions to Completion of the Merger".
The prepackaged plan of reorganization is referred to in this joint proxy
statement/prospectus as the "Plan".

     The Plan generally divides claims against and equity interests in PageNet
and some of its subsidiaries into classes and sets forth the treatment of each
class. The Plan also provides how unclassified priority claims will be treated.
The classification and treatment of claims and equity interests and the
distributions to be made under the Plan take into account the relative priority
of those claims and equity interests under the Bankruptcy Code and other
applicable law.

     If the Plan is confirmed by the bankruptcy court, each holder of an allowed
claim or equity interest will receive the same treatment as all other holders of
allowed claims or equity interests in the same class, regardless of whether a
particular holder votes to accept or reject the Plan. Moreover, upon
confirmation, the Plan will be binding on all creditors and stockholders
regardless of whether such creditors or stockholders vote on the Plan or vote to
accept or reject the Plan.

     The Plan provides for PageNet to complete the intended merger with Arch as
provided in the merger agreement. Under the Plan, all claims arising in the
ordinary course of PageNet's business will be paid in full, in cash, and claims
arising under PageNet's senior subordinated notes will be converted to equity
interests in Arch and Vast. Under the Plan, PageNet stockholders will receive
Arch common stock and Vast Class B common stock in the amounts specified in the
merger agreement for PageNet stockholders.

                                        7
<PAGE>   18

                    STOCK OWNERSHIP IN THE COMBINED COMPANY

     The merger, the Arch exchange offer and the PageNet exchange offer are
expected to have the following effect on beneficial ownership of Arch's common
stock:

<TABLE>
<CAPTION>
                                         PERCENTAGE OWNERSHIP OF              PERCENTAGE OWNERSHIP OF
                                            ARCH COMMON STOCK                 ARCH COMMON STOCK, ON A
                                               OUTSTANDING                      FULLY DILUTED BASIS
                                    ---------------------------------    ---------------------------------
                                    SEPTEMBER 30, 1999    AS ADJUSTED    SEPTEMBER 30, 1999    AS ADJUSTED
                                    ------------------    -----------    ------------------    -----------
<S>                                 <C>                   <C>            <C>                   <C>
Arch common stockholders..........        100.0%              29.6%             71.0%              26.7%
Arch Series C preferred
stockholders......................           --                1.2               2.5                1.1
Holders of Arch discount notes....           --               17.2                --               15.4
PageNet stockholders..............           --                7.5                --                6.7
Holders of PageNet senior
  subordinated notes..............           --               44.5                --               40.1
Arch warrantholders...............           --                 --              23.8                8.4
Arch and PageNet optionholders....           --                 --               2.7                1.6
                                          -----              -----             -----              -----
                                          100.0%             100.0%            100.0%             100.0%
                                          =====              =====             =====              =====
</TABLE>

     All of the foregoing information is based on numerous assumptions. For
example, the table assumes that all of Arch's discount notes, all of PageNet's
outstanding senior subordinated notes and all of Arch's outstanding Series C
preferred stock will be exchanged for common stock. The actual capitalization of
Arch upon closing the merger may vary considerably from the foregoing table. For
example, if 50% of the discount notes were tendered and accepted, their holders
would own 9.4% of Arch's outstanding stock and 8.4% on a fully diluted basis; if
1% of the discount notes were tendered and accepted, their holders would own
0.2% and 0.2%, respectively. In either case, the percentage ownership of the
Arch stockholders and the PageNet stockholders and noteholders would increase
proportionately. See "The Merger".

                                        8
<PAGE>   19

                                  RISK FACTORS

     You should consider carefully the following risks before you decide whether
to vote in favor of the merger. If any of these possible developments occur,
Arch's and/or Vast's business, financial condition and results of operations
would likely suffer. In that case, the trading price of Arch's and/or Vast's
common stock could decline, and the value of your shares could be less than the
current value of Arch common stock or equivalent amounts of PageNet common
stock.

RISKS RELATED TO THE MERGER AND AN INVESTMENT IN ARCH'S COMMON STOCK

  The exchange ratio used in the merger may prove to be unfavorable to you

     The exchange ratio of 0.1247 shares of Arch common stock for each share of
PageNet common stock was determined by negotiations between Arch and PageNet,
after consultation with their respective financial advisors. The exchange ratio
is not necessarily related to trading prices for Arch's or PageNet's common
stock or other recognized criteria of value for common stock such as assets, net
worth or results of operations. There can be no assurance that the market value
of the shares of Arch common stock issued in the merger will not be below their
current market value or below whatever valuation may be implied for them by the
exchange ratio, either during the period between the time you vote on the merger
and the time common stock certificates are issued following the closing of the
merger, or at any time afterwards. Neither Arch nor PageNet may terminate the
merger agreement or resolicit the votes of its stockholders solely because of
changes in the trading price of the other company's common stock. A change in
the trading price of either company's common stock will not result in any change
in the exchange ratio.

  Trading prices for Arch's common stock may be volatile

     The market price of Arch common stock has fluctuated and has declined
substantially since 1998. Between January 1, 1998 and January 27, 2000, the
reported sale price of common stock on the Nasdaq National Market System has
ranged from a high of $20.8125 per share in June 1998 to a low of $2.0625 per
share in October 1998. The trading price of Arch common stock following the
closing of the merger will be affected by numerous factors. These include the
risk factors set forth in this joint proxy statement/prospectus, as well as
prevailing economic and financial trends and conditions in the public securities
markets. Share prices of wireless communications companies such as Arch have
exhibited a high degree of volatility during recent periods. Shortfalls in
revenues or EBITDA from the levels anticipated by the public markets could have
an immediate and significant adverse effect on the trading price of Arch's
common stock in any given period. Shortfalls may result from events that are
beyond Arch's control and can be unpredictable. The trading price of Arch's
shares may also be affected by developments which may not have any direct
relationship with Arch's business or long-term prospects. These include reported
financial results and fluctuations in the trading prices of the shares of other
publicly held companies in the wireless communications industry.

  Shares eligible for future sale may depress the market price of Arch common
stock

     On December 31, 1999, 51.2 million shares of Arch common stock and Arch
Class B common stock were issued and outstanding. In addition, 1.7 million
shares of common stock are issuable upon conversion of convertible securities
and 16.6 million shares of common stock are issuable upon exercise of warrants.
The issuance of these shares of common stock, together with the issuance of up
to 2.8 million shares of common stock currently authorized for issuance under
Arch compensation plans and the assumption of PageNet options to acquire the
equivalent of 1.2 million shares of Arch common stock, will substantially dilute
the proportionate equity interests of the holders of common stock. No prediction
can be made as to the effect, if any, that future sales of common stock, or the
availability of shares for future sales, will have on the market price of the
common stock prevailing from time to time. Sales of substantial amounts of
common stock, including shares issued upon exercise of warrants or options, or
the perception that such sales could occur, could depress prevailing market
prices of common stock.

                                        9
<PAGE>   20

  Charter provisions may impede takeovers of Arch that might benefit Arch
stockholders

     Arch's certificate of incorporation and bylaws provide for a classified
board of directors, the issuance of "blank check" preferred stock whose terms
may be fixed by Arch's board of directors without further stockholder approval,
a prohibition on stockholder action by written consent in lieu of a meeting and
procedural requirements governing stockholder meetings. Arch also has a
stockholders rights plan. In addition, Section 203 of the Delaware corporations
statute will, with some exceptions, prohibit Arch from engaging in any business
combination with any "interested stockholder" for a three-year period after such
stockholder becomes an interested stockholder. These provisions may have the
effect of delaying, making more difficult or preventing a change in control or
acquisition of Arch even though such a transaction might be beneficial to Arch's
stockholders.

  Integrating Arch and PageNet will present challenges

     Arch may not be able to successfully integrate PageNet's operations. The
fact that Arch is still engaged in the process of integrating MobileMedia's
operations into those of Arch will increase the challenge of integrating
PageNet's operations. Any difficulties or problems encountered in the
integration process could have a material adverse effect on Arch. Even if
integrated in a timely manner, there can be no assurance that Arch's operating
performance will be successful or will fulfill management's objectives. Until
integration is complete, PageNet's business will continue to operate with some
autonomy. This degree of autonomy may blunt the implementation of Arch's
operating strategy.

     The combination of the two companies will require, among other things,
coordination of administrative, sales and marketing, distribution and accounting
and finance functions and expansion of information and management systems. The
integration process could cause the interruption of the activities of the two
businesses, or a loss of momentum. The difficulties of such integration will
initially be increased by the necessity of coordinating geographically separate
organizations and integrating personnel with disparate business backgrounds and
corporate cultures and by the fact that PageNet is in the process of a
significant restructuring of its own operations. See "Risks Related to PageNet".
Arch may not be able to retain key employees of PageNet. The process of
integrating the businesses of Arch and PageNet may require a disproportionate
amount of time and attention of Arch's management and financial and other
resources of Arch and may involve other, unforeseen difficulties.

     Similar risks will attend future acquisition opportunities which Arch may
pursue, and the assimilation of PageNet may add to the difficulty of making or
integrating other acquisitions.

  PageNet's operations may be disrupted prior to and following a bankruptcy
filing

     PageNet's business operations may be adversely affected by reluctance of
some customers and potential customers to do business with PageNet if it
commences or proposes to commence a chapter 11 proceeding as described under
"The Prepackaged Plan of Reorganization". Any significant loss of customers or
other deterioration in PageNet's business could have a material adverse effect
on PageNet and, as a result, on Arch if the merger is consummated.

  Transaction costs may exceed anticipated levels

     Arch estimates that the combined company will incur direct transaction
costs and closing costs of approximately $45.0 million associated with the
merger and related transactions. This amount is a preliminary estimate only and
is therefore subject to change. There can be no assurance that the combined
company will not incur significant additional costs in connection with the
merger.

  Actual results may differ from unaudited combined company projections

     The managements of Arch and PageNet have jointly prepared the combined
company financial projections contained in Annex H to this joint proxy
statement/prospectus for the cases under chapter 11 that PageNet may commence in
order to implement the merger. These projections assume that the merger

                                       10
<PAGE>   21

and related transactions will be implemented in accordance with their terms and
present the projected effects of the plan of reorganization on future operations
if the exchange offers and merger are consummated. The projections assume that
the merger and related transactions will be implemented in accordance with their
terms. The assumptions and estimates underlying the projections are inherently
uncertain and are subject to significant business, economic and competitive
risks and uncertainties. Accordingly, future financial condition and results of
operations of the combined company following the merger may vary significantly
from those set forth in the projections. Consequently, the projections should
not be regarded as a representation by Arch, PageNet, their advisors or any
other person that the projections will be achieved. See "Forward-Looking
Statements".

  Pro forma assumptions may prove to be inaccurate

     For purposes of presenting the projections and the pro forma condensed
consolidated financial statements included in this joint proxy
statement/prospectus, Arch and PageNet have assumed that 100% of Arch's discount
notes and 100% of PageNet's senior subordinated notes will be tendered and
accepted in the exchange offers. As described above, the merger may take place
in some circumstances if a smaller amount of discount notes, or no discount
notes at all, are tendered or if a smaller amount of PageNet's senior
subordinated notes are tendered. Arch and PageNet have also assumed that the
market value of the Arch common stock to be issued in connection with the merger
and the exchange offer will be $6.02 per share. Trading prices for common stock
fluctuate, and no prediction can be made as to what prices will prevail before
or after the merger takes place. On January 27, 2000, the closing market price
of Arch's common stock was $6.09375. See "Unaudited Pro Forma Condensed
Consolidated Financial Statements".

  Amortization charges may affect earnings sooner than expected

     Under purchase accounting treatment for the MobileMedia acquisition and the
merger, Arch must record a substantial amount of goodwill and other intangible
assets. This will result in substantial amortization charges to the consolidated
income of Arch over the useful lives of those assets. Arch estimates the
incremental amount of those charges will total approximately $57.0 million per
year for ten years. However, actual charges could vary significantly if the
underlying assets are impaired or if the useful lives of the assets are less
than currently estimated.

  Loss of corporate tax benefits is probable

     It is anticipated that the merger and the Arch and PageNet exchange offers
will result in the elimination of substantially all of the tax benefit of net
operating loss carryforwards and certain other tax attributes available to Arch
and PageNet, and also will result in some out-of-pocket tax liability. See
"Material Federal Income Tax Considerations".

  Creditors may allege defaults

     It is possible that holders of some of Arch's outstanding indebtedness may
allege that the merger constitutes either a breach or a default or a change in
control of Arch under their debt instruments entitling them to immediate
repayment of their indebtedness. See "Description of Indebtedness". The
magnitude of any resulting adverse consequences would depend upon, among other
factors, the diligence and vigor with which debt holders seek to assert any such
rights and pursue any such remedies, and Arch's ability to prevail in its
interpretation of the debt instruments or otherwise resolve matters on
acceptable terms.

  The merger may not take place

     The merger will not take place unless many conditions are satisfied or
waived. These conditions include stockholder and noteholder approvals,
governmental approvals and the availability of senior credit facilities. See
"The Merger Agreement -- Conditions to Completion of the Merger". Moreover,
PageNet

                                       11
<PAGE>   22

may be required in some circumstances to file prepackaged chapter 11 cases to
implement the merger. There can be no assurance that the proposed plan of
reorganization would be approved by the bankruptcy court if filed. If the merger
does not take place, the contemplated benefits of the merger will not be
realized, and you will retain your interest as a stockholder in a company which
will not enjoy the anticipated benefits of the merger despite incurring
substantial transaction costs, which are estimated at $10.0 million for each of
Arch and PageNet. If the merger does not take place for certain specified
reasons and either company decides to terminate the merger agreement, one
company may be required to pay the other a $40.0 million termination fee. See
"The Merger Agreement -- Termination Fee." Trading prices of Arch and PageNet
common stock may fluctuate between now and the closing, due in part to
uncertainty as to whether or when the merger will take place.

ARCH'S BUSINESS AND FINANCIAL RISKS

  Continued losses are likely

     Arch and PageNet have reported net losses in the past, as has MobileMedia.
Arch expects that the combined company may continue to report net losses and
cannot give any assurance about when, if ever, it is likely to attain
profitability.

     Arch and PageNet have reported net losses in all of the periods shown in
the table below:

<TABLE>
<CAPTION>
                                                                             NINE MONTHS
                                                                                ENDED
                                             YEAR ENDED DECEMBER 31,        SEPTEMBER 30,
                                         -------------------------------    -------------
                                           1996        1997       1998          1999
                                         ---------    -------    -------    -------------
                                                      (DOLLARS IN MILLIONS)
<S>                                      <C>          <C>        <C>        <C>
Net income (loss):
  Arch...............................    $  (114.7)   $(181.9)   $(206.1)      $(227.6)
  MobileMedia........................    $(1,059.9)   $(124.6)   $  35.6       $ 387.3(1)
  PageNet............................    $  (104.3)   $(156.9)   $(162.0)      $(234.0)
</TABLE>

- ---------------
(1) Through Arch's acquisition of MobileMedia on June 3, 1999

     These historical net losses have resulted principally from substantial
depreciation and amortization expense, primarily related to intangible assets
and pager depreciation, interest expense, the impairment of long-lived assets,
other costs of growth and, in the case of PageNet, significant restructuring
costs. MobileMedia had net income of $35.6 million during the year ended
December 31, 1998 solely because of a $94.2 million gain on the sale of
transmission towers and related equipment and net income of $387.3 million for
the period ended June 3, 1999 primarily due to the forgiveness of debt arising
out of MobileMedia's bankruptcy proceedings. After giving effect to the merger
and the MobileMedia acquisition, Arch would have incurred, on a pro forma basis,
losses before extraordinary items and cumulative effect of accounting change of
$251.6 million for the year ended December 31, 1998 and $285.5 million for the
nine months ended September 30, 1999.

  Revenues and operating results may fluctuate

     Arch believes that future fluctuations in its revenues and operating
results may occur due to many factors, including competition, subscriber
turnover, new service developments and technological change, both before and
after the merger. Arch's current and planned expenses and debt repayment levels
are, to a large extent, fixed in the short term, and are based in part on its
expectations as to future revenues and cash flow growth. Arch may be unable to
adjust spending in a timely manner to compensate for any revenue or cash flow
shortfall. It is possible that, due to future fluctuations, Arch's revenue, cash
flow or operating results may not meet the expectations of securities analysts
or investors. This may have a material adverse effect on the price of Arch's
common stock. If shortfalls were to cause Arch not to meet the financial
covenants contained in its debt instruments, the debtholders could declare a
default and seek immediate repayment.

                                       12
<PAGE>   23

  High degree of leverage may continue to burden operations

     Arch has been highly leveraged, and expects to remain at least considerably
leveraged following the PageNet merger. The following table compares the total
debt, total assets and latest three-month annualized adjusted EBITDA of Arch and
PageNet at or as of September 30, 1999 and the pro forma total debt, total
assets and nine month annualized adjusted EBITDA of the combined company as of
September 30, 1999, assuming the exchange of all PageNet senior subordinated
notes.

<TABLE>
<CAPTION>
                                                                PRO           PRO           PRO
                                                               FORMA         FORMA         FORMA
                                                              COMBINED      COMBINED      COMBINED
                                       ARCH      PAGENET     COMPANY(1)    COMPANY(2)    COMPANY(3)
                                     --------    --------    ----------    ----------    ----------
                                                         (DOLLARS IN MILLIONS)
<S>                                  <C>         <C>         <C>           <C>           <C>
Total debt.........................  $1,360.8    $1,999.3     $2,188.8      $1,997.0      $1,805.2
Total assets.......................  $1,424.5    $1,520.9     $3,041.1      $3,041.1      $3,041.1
Annualized adjusted EBITDA.........  $  262.1    $  236.5     $  538.0      $  538.0      $  538.0
</TABLE>

- ---------------
(1) Assumes no exchange of Arch's discount notes for common stock
(2) Assumes exchange of 50% of Arch's discount notes
(3) Assumes exchange of all of Arch's discount notes

     Adjusted EBITDA is not a measure defined in GAAP and should not be
considered in isolation or as a substitute for measures of performance prepared
in accordance with GAAP. Adjusted EBITDA, as determined by Arch and PageNet, may
not necessarily be comparable to similarly titled data of other paging
companies.

     Having the kind of leverage illustrated above may have adverse consequences
for Arch. These include the following:

     - This leverage may impair Arch's ability to obtain additional financing
       necessary for acquisitions, working capital, capital expenditures or
       other purposes on acceptable terms, if at all.

     - A substantial portion of Arch's cash flow will be required to pay
       interest expense; this will reduce the funds which would otherwise be
       available for operations and future business opportunities.

     - Arch's credit facilities and indentures contain financial and restrictive
       covenants; the failure to comply with these covenants may result in an
       event of default which could have a material adverse effect on Arch if
       not cured or waived.

     - Arch may be more highly leveraged than some of its competitors in the
       wireless communications industry, and this may place it at a competitive
       disadvantage.

     - Any degree of leverage will make Arch more vulnerable to a downturn in
       its business or the economy generally than if it were not as leveraged.

There can be no assurance that Arch will be able to reduce its financial
leverage as it intends, nor that Arch will achieve an appropriate balance
between growth which it considers acceptable and future reductions in financial
leverage. If Arch is not able to achieve continued growth in EBITDA, it may be
precluded from incurring additional indebtedness due to cash flow coverage
requirements under existing or future debt instruments.

  Funding for future capital needs is not assured

     Arch's business strategy requires substantial funds to be available to
finance the continued development and future growth and expansion of its
operations, including possible acquisitions. Arch's future capital requirements
will depend upon a number of factors. These factors include subscriber growth,
the type of wireless communications devices and services demanded by customers,
technological developments, marketing and sales expenses, competitive
conditions, the nature and timing of Arch's N-PCS strategy and acquisition
strategies and opportunities. No assurance can be given that additional equity

                                       13
<PAGE>   24

or debt financing will be available to Arch when needed on acceptable terms, if
at all. If sufficient financing is unavailable when needed, Arch may experience
material adverse effects.

  Competition and technological change may undermine Arch's business

     There can be no assurance that the combined company will be able to compete
successfully with current and future competitors in the wireless communications
business or with competitors offering alternative communication technologies.

  Competition may intensify and may adversely affect margins

     The combined company may face significant additional competition in the
future. This could have a material adverse effect on its revenues and EBITDA.
Some competitors possess greater financial, technical and other resources than
those of the combined company. Increased competition from broadband personal
communications service, or PCS, providers, cellular providers, digital
specialized mobile radio, or SMR, providers, dedicated data networks and
wireless information delivery service providers has led to competition from
increasingly larger and better capitalized competitors. In addition, Arch
competes with the many other providers of paging and advanced messaging
services. If any of such competitors were to devote additional resources to the
wireless communications business or focus on Arch's or PageNet's historical
business segments, there could be a material adverse effect on the combined
company.

  New 2-way wireless messaging technology may adversely affect Arch's
competitive position

     Competitors are currently using and developing a variety of 2-way wireless
messaging technologies. Arch and PageNet currently resell such 2-way services
over the network of a competitor, and each of Arch and PageNet is preparing to
sell such services over its own advanced wireless messaging network in January
2000. Due to the relatively recent availability of 2-way messaging products and
services, there have not yet been sales which would be sufficient to fully
indicate a proven demand for such services among business or consumer
subscribers. Such services will compete with other available methods of
telecommunications, including cellular and broadband personal communications
services, which are commonly referred to as PCS, as well as specialized mobile
radio, or SMR, services and services provided over dedicated data networks which
use hand-held devices to send and receive data. Although these services are
primarily focused on 2-way voice communications, they may include wireless
messaging as an adjunct service or may replace the need for 2-way messaging
entirely. It is less expensive for an end user to obtain a cellular or PCS unit
with data capability than the 2-way messaging units currently available, as the
nationwide cellular and PCS carriers have subsidized the purchase of these units
and prices for broadband services have been declining rapidly, making the two
types of services and product offerings more comparable. Future technological
advances in the telecommunications industry, including these 2-way messaging
technologies, as well as wireless information and telemetry, among others, could
increase the number and type of new services or products which compete with the
wireless messaging services historically offered by Arch and PageNet. Firms
seeking to provide wireless communications through these and other technologies
may bring their products to market faster or in packages of products that
consumers find more valuable than those which Arch and PageNet propose to
provide.

  Obsolescence in company-owned units may impose additional costs on Arch

     Technological change may also adversely affect the value of the units owned
by Arch and PageNet that are leased to their subscribers. If Arch's or PageNet's
current subscribers request more technologically advanced units, including 2-way
units, the combined company could incur additional inventory costs and capital
expenditures if required to replace units leased to its subscribers within a
short period of time. Such additional investment or capital expenditures could
have a material adverse effect on the combined company.

                                       14
<PAGE>   25

  Government regulation may burden operations

     Licenses may not be automatically renewed

     Arch's and PageNet's FCC paging licenses are for varying terms of up to 10
years. When the licenses expire, renewal applications must be approved by the
FCC. To date, the FCC has approved each assignment and transfer of control for
which Arch or PageNet has sought approval; however, no assurance can be given
that any future renewal applications will be free of challenge or will be
granted by the FCC.

     Regulatory changes could add burdens or benefit competing technologies

     The FCC continually reviews and revises its rules affecting wireless
communications companies. Therefore, regulatory requirements that apply to the
combined company may change significantly over time.

     Acquisitions of Arch's stock by foreigners could jeopardize Arch's licenses

     The Communications Act limits foreign investment in and ownership of radio
common carriers licensed by the FCC, as well as their parent companies. Arch may
not have more than 25% of its stock owned or voted by aliens or their
representatives, a foreign government or its representatives or a foreign
corporation if the FCC finds that the public interest would be served by denying
such ownership. Arch's subsidiaries that are radio common carrier licensees are
subject to more stringent requirements and may have only up to 20% of their
stock owned or voted by aliens or their representatives, a foreign government or
their representatives or a foreign corporation. This ownership restriction is
not subject to waiver. Arch's charter permits the redemption of shares of Arch's
capital stock from foreign stockholders where necessary to protect FCC licenses
held by Arch or its subsidiaries, but such a redemption would be subject to the
availability of capital to Arch and any restrictions contained in applicable
debt instruments and under the Delaware corporation statute. These restrictions
currently would not permit any such redemptions. The failure to redeem shares
promptly could jeopardize the FCC licenses held by Arch or its subsidiaries.

  Arch cannot control third parties on whom Arch depends for products and
services

     Arch does not manufacture any of the equipment customers need to take
advantage of its services. It is dependent primarily on Motorola and NEC America
Inc. to obtain sufficient equipment inventory for new subscribers and
replacement needs and on Glenayre Electronics, Inc. and Motorola for sufficient
terminals and transmitters to meet its expansion and replacement requirements.
Significant delays in obtaining equipment, terminals or transmitters, such as
MobileMedia experienced before its bankruptcy filing, could lead to disruptions
in operations and adverse financial consequences. Motorola has announced its
intention to discontinue manufacturing transmitters and other paging
infrastructure during 2000, although it will continue to maintain and service
existing infrastructure into the future. Arch's purchase agreement with Motorola
expires on March 17, 2000. There can be no assurance that the agreement with
Motorola will be renewed or, if renewed, that the renewed agreement will be on
terms and conditions as favorable to the combined company as those under the
current agreement.

     Arch relies on third parties to provide satellite transmission for some
aspects of its wireless communications services. To the extent there are
satellite outages or if satellite coverage is impaired in other ways, Arch may
experience a loss of service until such time as satellite coverage is restored,
which could have a material adverse effect.

  Downturn in units in service may occur

     Cancellation of units in service can significantly affect the results of
operations of wireless communications service providers. The sales and marketing
costs associated with attracting new subscribers are substantial compared to the
costs of providing service to existing customers. Because the wireless
communications business is characterized by high fixed costs, cancellations
directly and adversely affect EBITDA. No prediction can be made about future
cancellation trends.

                                       15
<PAGE>   26

  Loss of key personnel could adversely impact operations

     Arch's success will depend, to a significant extent, upon the continued
services of a relatively small group of executive personnel. Arch does not have
employment agreements with any of its current executive officers, or maintain
life insurance on their lives, although all executive officers have entered into
executive retention agreements with Arch. The loss or unavailability of one or
more of its executive officers or the inability to attract or retain key
employees in the future could have a material adverse effect on Arch.

  Impact of the Year 2000 issue is not fully known

     The Year 2000 problem is the result of computer programs being written
using two digits (rather than four) to define the applicable year or otherwise
inadequately dealing with dates. Any of Arch's programs or internal or external
systems that have date-sensitive software may recognize a date using "00" as the
year 1900 rather than the year 2000. This recognition could result in a system
failure or miscalculations causing disruptions of operations, including, among
other things, a temporary inability to process transactions, send invoices or
engage in similar normal business activities. To date no problems relating to
the transition from December 31, 1999 to January 1, 2000 have been identified.
Arch will continue to monitor and test for potential Year 2000 issues that could
arise in the future, such as those potential issues which could arise as a
result of Year 2000 being a leap year.

     To address these potential issues, Arch created a cross-functional Y2K
project group that analyzed and identified internal and external areas likely to
be affected by the Year 2000 problem. Arch requested information from certain
mission critical vendors and held discussions with equipment and other mission
critical vendors concerning their efforts to identify and address potential
issues associated with their equipment and/or software. Arch created contingency
plans in anticipation of the December 31, 1999 to January 1, 2000 transition. In
addition, Arch tested units and messaging-related equipment used by Arch and its
customers with favorable results. Nevertheless, this equipment is manufactured
by third parties, and, accordingly, Arch has relied, and continues to rely, to a
large extent on the representations of its vendors. Arch cannot offer assurance
as to the accuracy of its vendors' representations or its ability to replicate
its testing results in a real time environment.

     Arch began testing its applications in 1998. This testing detected
applications that may be affected by the Year 2000 problem. Arch has completed
what it believes to be appropriate modifications and/or replacements of its
computerized systems and applications to address these potential issues and to
be Year 2000 ready. The costs associated with such replacements have been
capitalized and amortized in accordance with Arch's existing accounting policies
and future replacement costs, if any, will be capitalized and amortized in a
similar manner. Maintenance or modification costs have been, and will be,
expensed as incurred. To date, Arch does not believe that resolution of the Year
2000 problem has had a material adverse effect on its results of operations or
financial condition. Actual costs and results may vary significantly due to the
uncertainties associated with the problem, which may not be apparent until the
second quarter of 2000.

     Arch's contingency plans for the December 31, 1999 to January 1, 2000
transition included, among other things, the use of (1) backup generators for
some of its operations, (2) some alternate vendors and (3) various communication
channels to deploy its work force in a timely and efficient manner to address
potential issues that could arise. Each of these plans may be used, if
necessary, in anticipation of the transition to any other dates determined to be
potentially affected by the Year 2000 problem.

  Debt instruments restrict operations

     Various debt instruments impose operating and financial restrictions on
Arch. Arch's senior credit facility requires various Arch operating subsidiaries
to maintain specified financial ratios, including a maximum leverage ratio, a
minimum interest coverage ratio, a minimum debt service coverage ratio and a
minimum fixed charge coverage ratio. The senior credit facility will be amended
and restated on the date of the merger and will include a restriction on capital
expenditures, a minimum revenue test and, if less than 100% of the Arch lenders
consent to the merger, two new leverage ratio tests pertaining to a separate
                                       16
<PAGE>   27

credit facility for PageNet. In addition, the senior credit facility limits or
restricts, among other things, Arch's operating subsidiaries' ability to:

     - declare dividends or redeem or repurchase capital stock;

     - prepay, redeem or purchase debt;

     - incur liens and engage in sale/leaseback transactions;

     - make loans and investments;

     - incur indebtedness and contingent obligations;

     - amend or otherwise alter debt instruments and other material agreements;

     - engage in mergers, consolidations, acquisitions and asset sales;

     - engage in transactions with affiliates; and

     - alter its lines of business or accounting methods.

Other debt instruments limit, among other things:

     - the incurrence of additional indebtedness by Arch and its subsidiaries;

     - the payment of dividends and other restricted payments by Arch and its
       subsidiaries;

     - asset sales;

     - transactions with affiliates;

     - the incurrence of liens; and

     - mergers and consolidations.

     Arch's ability to comply with such covenants may be affected by events
beyond its control, including prevailing economic and financial conditions. A
breach of any of these covenants could result in a default under the senior
credit facility and/or other debt instruments. Upon the occurrence of an event
of default, the creditors could elect to declare all amounts outstanding to be
immediately due and payable, together with accrued and unpaid interest. If Arch
were unable to repay any such amounts, the senior creditors could proceed
against any collateral securing the indebtedness. If the lenders under the
senior credit facility or other debt instruments accelerated the payment of such
indebtedness, there can be no assurance that the assets of Arch would be
sufficient to repay in full such indebtedness and other indebtedness of Arch. In
addition, because the senior credit facility and other debt instruments limit
Arch's ability to engage in some types of transactions, Arch may be prohibited
from entering into transactions that could be beneficial to Arch.

RISKS RELATED TO PAGENET

     PageNet faces many of the same risks that Arch faces. In addition, PageNet
is subject to these particular risks:

  PageNet may be required to reduce its operations and/or restructure its
  obligations under the Bankruptcy Code

     If PageNet is unable to improve its domestic EBITDA, it may not have
sufficient cash or borrowing capacity to meet its obligations through the end of
the first quarter of 2000. While PageNet is currently exploring various
alternatives to ensure that it has sufficient liquidity through the consummation
of the merger, there can be no assurance that such efforts will be timely or
successful. There also can be no assurance that the merger will be completed or
will not be substantially delayed. If PageNet's strategies to obtain additional
liquidity are not timely or successful, or the merger is not completed or is
delayed, PageNet may be required to reduce the level of its operations and/or
commence a proceeding under chapter 11 of the Bankruptcy Code to restructure its
obligations, including its obligations under the
                                       17
<PAGE>   28

PageNet senior subordinated notes. Further, PageNet does not expect to make
interest payments due February 1, 2000 on certain of such notes. As a result,
subject to applicable grace periods under the indentures, the noteholders could
accelerate the outstanding indebtedness and institute an involuntary bankruptcy
proceeding against PageNet. Such a bankruptcy filing by or against PageNet would
likely have a material impact on PageNet's results of operations and financial
position.

 PageNet may face action by lenders for noncompliance with financial covenants
 under its credit facilities

     PageNet's compliance with the financial covenants in its bank credit
agreement depends upon improvement in PageNet's domestic EBITDA for the fourth
quarter of 1999, which is not anticipated. Therefore, it is likely that PageNet
will no longer be in compliance with the covenants of its credit agreement upon
the finalization of its financial results for the fourth quarter of 1999. If
PageNet is not in compliance with its debt covenants, PageNet would seek to
obtain a waiver or deferral of any action by the lenders for such noncompliance
under the credit agreement. If PageNet is unable to obtain a waiver or deferral,
the lenders will have various rights, including the right to accelerate all
outstanding indebtedness. Such deferral or acceleration would also cause PageNet
to be in default under the cross-default provisions of the PageNet senior
subordinated notes.

 PageNet's restructuring may not achieve its objectives

     PageNet has been restructuring its support functions into centralized
facilities called "centers of excellence" beginning in 1998. While progress has
been made, PageNet's efforts to implement the restructuring have fallen behind
PageNet's original schedule. PageNet's plan called for the conversions to be
substantially complete during early 1999. PageNet recently announced the
suspension of future conversions after January 2000, at which time PageNet
expects to have converted 100% of its customer units placed in service
indirectly through PageNet's resellers, and approximately 50% of its directly
marketed customer units to the centers of excellence. The suspension of future
conversions, combined with the impact of the contemplated merger on operations,
will make it difficult for PageNet to determine the amount of potential cost
savings resulting from the centers of excellence initiative or to realize the
full benefits intended to be achieved from the restructuring.

 Downturn in PageNet's units in service may continue

     PageNet had approximately 9,314,000 units in service at September 30, 1999,
down from its high of 10,604,000 units in service at June 30, 1998. PageNet has
had a net reduction in the number of units in service during each of the five
previous quarters ended September 30, 1999, and the amount of such net reduction
has generally increased during each quarter. The net reduction of units in
service with subscribers is mainly due to PageNet's continued rationalization of
its customer base, intensifying price competition in the market for wireless
communications services, and the degree to which broadband services, such as
those with short messaging capability built into the units, are being subscribed
to in lieu of one-way messaging services, such as those offered by PageNet. The
sales and marketing efforts associated with attracting new subscribers are
substantial compared to the costs of providing service to existing customers.
Because the wireless messaging business is characterized by high fixed costs,
cancellations directly and adversely affect EBITDA. The failure to reverse this
trend of accelerating customer cancellations could have a material adverse
effect on PageNet and, as a result, on the combined company if the merger is
consummated.

 PageNet may be delisted from the Nasdaq National Market System and the Chicago
 Stock Exchange prior to the completion of the merger, resulting in reduced
 trading liquidity for the shares of its common stock

     PageNet has received a notice from Nasdaq informing it that it would be
delisted from the Nasdaq National Market System on December 22, 1999 unless
PageNet requests a hearing prior to that time. On December 16, PageNet requested
a hearing from Nasdaq, which is scheduled to occur on January 27, 2000. At the
hearing, PageNet will request an extension of the time by which it must comply
with the minimum listing requirements. If Nasdaq does not allow an extension of
time and if PageNet's stock does not close above $5.00 for at least ten
consecutive days, then PageNet's stock may be transferred to the
                                       18
<PAGE>   29

Nasdaq Small Cap Market if its stock remains consistently above $1.00 per share,
or to over-the-counter trading if its stock trades below $1.00 per share. In
addition, PageNet has been notified by the Chicago Stock Exchange that if it is
delisted by Nasdaq, the Chicago Stock Exchange intends to enforce its own
minimum listing requirements. PageNet does not currently comply with these
listing requirements, and the Chicago Stock Exchange has indicated that it would
not be willing to extend the time for PageNet's compliance until after the
completion of the merger. The delisting of PageNet's stock from the Nasdaq
National Market System may result in PageNet appraisal rights becoming available
for PageNet stockholders. This result could add further complications and
uncertainty to the merger.

RISKS RELATED TO VAST

     If PageNet completes its merger with Arch, PageNet stockholders will
receive Class B common stock of Vast, currently a wholly owned subsidiary of
PageNet. An investment in Vast involves numerous risks. These risks are
described under "Risk Factors" in the prospectus relating to Vast attached as
Annex F.

RISKS RELATED TO POSSIBLE BANKRUPTCY CASES

     PageNet may have to resolicit acceptances if its disclosure statement does
not comply with the requirements of the Bankruptcy Code

     The Bankruptcy Code provides that acceptances by creditors and stockholders
of a plan of reorganization before the commencement of chapter 11 cases are
binding during the cases so long as the solicitation of such acceptances
complied with applicable non-bankruptcy law governing the adequacy of disclosure
in connection with such solicitations, or, if such laws do not exist, such
acceptances were solicited after creditors and stockholders were provided with
adequate information to allow them to make a reasonably informed judgment
whether to accept or reject the plan.

     PageNet believes that its disclosure statement and the forms of ballots
which will be sent to all creditors and stockholders whose claims or equity
interests are adversely affected by the Plan comply with applicable
non-bankruptcy law and the Bankruptcy Code. However, there can be no assurance
that the bankruptcy court will decide that the solicitation materials contain
adequate information to meet the requirements of applicable non-bankruptcy law
or the Bankruptcy Code or that the balloting procedures satisfy the requirements
of applicable non-bankruptcy law or the Bankruptcy Code. If the bankruptcy court
determines that the solicitation and/or balloting procedures do not comply with
the requirements of applicable non-bankruptcy law or the Bankruptcy Code,
PageNet may be required to resolicit acceptances. In such event, confirmation of
the Plan and consummation of the merger agreement could be delayed and
potentially jeopardized.

     PageNet may have to resolicit acceptances if the bankruptcy court finds its
classification scheme improper

     The Plan classifies the claims of all creditors against PageNet and the
equity interests of all stockholders in PageNet. To comply with the
classification requirements of the Bankruptcy Code, claims or equity interests
may be placed in the same class only if such claims or equity interests are
substantially similar to each other. The Plan separately classifies general
unsecured claims from claims arising under or related to PageNet's senior
subordinated notes despite the fact that both types of claims are unsecured.
Many of the creditors in the general unsecured creditor class are key suppliers
of products and services to PageNet. Accordingly, any failure to pay those
claims in accordance with their original terms could hurt PageNet's ability to
obtain essential trade credit and could hurt PageNet's ability to do business
with trade creditors whose goods and services are essential to PageNet. The
senior subordinated notes contain subordination provisions. PageNet believes
that these subordination provisions make senior subordinated note claims
significantly different from the other general unsecured claims and, together
with the critical importance of the trade creditors to PageNet's future
viability, provides a proper basis on which to separately classify such claims.
The Plan also classifies claims for rescission or damages related to the
purchase or sale of a senior subordinated note with claims under the senior
subordinated notes. Claims for rescission or damages might be subject to
mandatory subordination under the Bankruptcy Code which
                                       19
<PAGE>   30

could be contrary to the Plan's classification scheme. While PageNet does not
believe that claims for damages or rescission exist, if there are such claims,
the holders of senior subordinated notes might demand that they be separately
classified.

     If the bankruptcy court finds that the Plan's classification scheme is
improper, PageNet would seek (1) to modify the Plan to provide for whatever
reasonable classification might be required for confirmation and (2) to use the
acceptances received from creditors and stockholders pursuant to this
solicitation to confirm the Plan as so amended. If any reclassification of
claims adversely affects the treatment a holder will receive, it is likely that
PageNet will be required to resolicit creditors adversely affected by such
reclassification. Any requirement to resolicit acceptances will delay
confirmation and could jeopardize consummation of the Plan and the merger.

  The Plan may not comply with the "cramdown" provisions of the Bankruptcy Code

     If any class of creditors or stockholders whose claims or interests are
adversely affected by the Plan reject the Plan, the bankruptcy court may
nevertheless confirm the Plan at PageNet's request pursuant to the "cramdown"
provisions of the Bankruptcy Code, provided that at least one impaired class has
accepted the Plan, with such acceptance being determined without including the
acceptance of any "insider" in such class. To confirm the Plan through a
"cramdown" the bankruptcy court must determine that, as to each impaired class
which has rejected the Plan, the Plan "does not discriminate unfairly" and is
"fair and equitable". PageNet reserves the right to seek confirmation of the
Plan under the "cramdown" provisions of the Bankruptcy Code in the event the
holders of any class of impaired claims or equity interests fail to accept the
Plan. There can be no assurance that the bankruptcy court will make the factual
findings and reach the legal conclusions required to permit confirmation of the
Plan through a cramdown.

  The bankruptcy court may not confirm the Plan

     Even if the requisite acceptances to the Plan are received, there can be no
assurance that the bankruptcy court will confirm the Plan. A non-accepting
creditor or stockholder of PageNet might object to confirmation based on a
variety of factors including by asserting that the disclosure with respect to
the solicitation of acceptances was not adequate, the solicitation procedures
and results were inadequate or improper, or the terms of the Plan do not comply
with any of the confirmation requirements of the Bankruptcy Code. Even if the
bankruptcy court were to determine that the disclosure and the balloting
procedures and results were appropriate, the bankruptcy court could still
decline to confirm the Plan if it were to find that any statutory condition to
confirmation had not been met. Even if the Plan is accepted by all classes of
claims and equity interests, confirmation standards require, among other things,
a finding by the bankruptcy court that the Plan was filed in good faith, that
confirmation of the Plan is not likely to be followed by a liquidation or a need
for further financial reorganization and that the value of distributions to each
holder of a claim or interest will not be less than the value of any
distribution that such holder would receive if PageNet were liquidated under
chapter 7 of the Bankruptcy Code. It could be argued that the classification
scheme provided for under the Plan violates applicable classification rules.
While there can be no assurance that the bankruptcy court will conclude that the
statutory confirmation requirements have been met, PageNet believes that the
Plan satisfies all applicable confirmation requirements.

     The confirmation and consummation of the Plan are also subject to certain
other conditions including satisfaction of all conditions to the merger. No
assurance can be given that these conditions will be satisfied or that PageNet
would waive such conditions if not satisfied.

  Failure to confirm the Plan expeditiously may keep the merger from taking
place.

     If the Plan, as filed or modified, is not confirmed in a timely manner, the
merger might not be consummated and implemented.

     If the merger is not consummated, PageNet will have to pursue other
alternatives which could include (1) liquidation of PageNet under chapter 7 or
chapter 11 of the Bankruptcy Code and (2) confirmation of

                                       20
<PAGE>   31

an alternative plan or reorganization under chapter 11 of the Bankruptcy Code.
Any recovery to stockholders under such alternative scenarios, if any, cannot be
predicted.

     Unless the Plan, the merger agreement or the termination fee provisions are
approved by the bankruptcy court, they may not be binding on PageNet.

     If the PageNet bankruptcy cases are filed, the merger agreement and its
related provisions concerning a termination fee of $40.0 million, which would be
payable to Arch under certain conditions, may not be binding upon PageNet, in
its capacity as a debtor in possession under the Bankruptcy Code, unless the
merger agreement is assumed by PageNet under the Bankruptcy Code or the
termination fee provision is otherwise approved by order of the bankruptcy
court. In connection with the filing of its bankruptcy cases, PageNet has agreed
to seek approval by the bankruptcy court of the termination fee and certain
other provisions of the merger agreement. Approval of such provisions, however,
is subject to the discretion of the bankruptcy court, and there can be no
assurance that the bankruptcy court will approve that such provisions. If the
termination fee and certain other provisions are not approved by the bankruptcy
court within 30 days of the filing of the bankruptcy cases, Arch is entitled to
terminate the merger agreement without liability.

     Additionally, the Plan provides that the merger agreement is to be assumed
by PageNet, thus becoming enforceable, in connection with confirmation of the
Plan. As discussed in this joint proxy statement/prospectus, there can be no
assurance that the necessary confirmation requirements will be satisfied or
that, if they are satisfied, the bankruptcy court will confirm the Plan. If
neither the merger agreement nor the termination fee is approved, Arch may have
only unsecured damage claims against PageNet.

                           FORWARD-LOOKING STATEMENTS

     This joint proxy statement/prospectus contains forward-looking statements
that are made under the safe harbor provisions of the Private Securities
Litigation Reform Act of 1995. You should consider any statements that are not
statements of historical fact to be forward-looking statements. These include
statements to the effect that PageNet, Arch or its respective management or
board of directors "believe", "expect", "anticipate", "plan" and similar
expressions. A number of important factors could cause actual results to differ
materially from those expressed in any forward-looking statements. See "Risk
Factors". Arch and PageNet undertake no obligation to update any forward-looking
statements for any reason, even if new information becomes available or other
events occur in the future.

                                       21
<PAGE>   32

                SELECTED PRO FORMA FINANCIAL AND OPERATING DATA

     The following unaudited pro forma financial and operating data of the
combined company gives effect to the following transactions as if they were
consummated as of September 30, 1999 with respect to the unaudited pro forma
balance sheet, except for Arch's acquisition of MobileMedia which closed prior
to September 30, 1999, and on January 1, 1998 with respect to the unaudited pro
forma statements of operations:

     - Arch's acquisition of MobileMedia, which closed on June 3, 1999;

     - the repurchase of $383.6 million (accreted value) of Arch discount notes
       for 29.7 million shares of Arch common stock;

     - the conversion of 250,000 shares of Arch convertible preferred stock into
       2.1 million shares of Arch common stock;

     - the exchange of $16.3 million (accreted value) of Arch discount notes for
       2.3 million shares of Arch common stock in October 1999;

     - the exchange of $1.2 billion of PageNet senior subordinated notes and
       accrued interest thereon for 616.8 million shares of PageNet common stock
       and 13.8 million shares of Vast Class B common stock;

     - the distribution by PageNet of 2.3 million shares of Vast Class B common
       stock to the current PageNet stockholders; and

     - Arch's merger with PageNet.

     The following selected pro forma financial and operating data should be
read in conjunction with the unaudited pro forma condensed consolidated
financial statements and notes. The financial impact of expected operational
cost synergies resulting from the merger of Arch and PageNet and Arch's
acquisition of MobileMedia is excluded from this presentation.

     The pro forma financial and operating data is presented for illustrative
purposes only and does not necessarily predict the operating results or
financial position that would have occurred if the merger of PageNet and Arch
and Arch's acquisition of MobileMedia had been consummated as of the dates
indicated above. Nor does it predict the future operating results or financial
position of Arch following the merger and the MobileMedia acquisition.

     Adjusted EBITDA, as determined by Arch, does not reflect restructuring
charge, provision for asset impairment and bankruptcy related expenses;
consequently adjusted EBITDA may not necessarily be comparable to similarly
titled data of other wireless communications companies. EBITDA is commonly used
by analysts and investors as a principal measure of financial performance in the
wireless communications industry. EBITDA is also one of the primary financial
measures used to calculate whether Arch and its subsidiaries are in compliance
with financial covenants under their debt agreements. These covenants, among
other things, limit the ability of Arch and its subsidiaries to: incur
additional indebtedness, make investments, pay dividends, grant liens on its
assets, merge, sell or acquire assets, repurchase or redeem capital stock, incur
capital expenditures and repay certain indebtedness. EBITDA is also one of the
financial measures used by analysts to value Arch. Therefore Arch management
believes that the presentation of EBITDA provides relevant information to
investors. EBITDA should not be construed as an alternative to operating income
or cash flows from operating activities as determined in accordance with GAAP or
as a measure of liquidity. Amounts reflected as EBITDA or adjusted EBITDA are
not necessarily available for discretionary use as a result of restrictions
imposed by the terms of existing indebtedness and limitations imposed by
applicable law upon the payment of dividends or distributions, among other
things.

                                       22
<PAGE>   33

     Adjusted EBITDA margin is calculated by dividing Arch's adjusted EBITDA by
total revenues less cost of products sold. EBITDA margin is a measure commonly
used in the wireless communications industry to evaluate a company's EBITDA
relative to total revenues less cost of products sold as an indicator of the
efficiency of a company's operating structure.

<TABLE>
<CAPTION>
                                                                                        PRO FORMA
                                                               PRO FORMA               NINE MONTHS
                                                               YEAR ENDED                 ENDED
                                                           DECEMBER 31, 1998       SEPTEMBER 30, 1999
                                                           ------------------      -------------------
                                                           (IN THOUSANDS, EXCEPT PERCENTAGE, PER SHARE
                                                                         AND UNIT DATA)
<S>                                                        <C>                     <C>
STATEMENT OF OPERATIONS DATA:
Service, rental and maintenance revenues................       $1,731,239              $1,263,226
Product sales...........................................          169,606                 115,139
                                                               ----------              ----------
Total revenues..........................................        1,900,845               1,378,365
Cost of products sold...................................         (129,787)                (75,689)
                                                               ----------              ----------
                                                                1,771,058               1,302,676
Operating expenses:
Service rental and maintenance..........................          394,444                 326,201
Selling.................................................          214,588                 150,927
General and administrative..............................          563,049                 422,048
Depreciation and amortization...........................          697,337                 501,482
Restructuring charge....................................           88,700                  (2,200)
Provision for asset impairment..........................               --                  17,798
Bankruptcy related expenses.............................            8,163                  14,938
                                                               ----------              ----------
Total operating expenses................................        1,996,281               1,431,194
                                                               ----------              ----------
Operating income (loss).................................         (195,223)               (128,518)
Interest and other income (expense).....................          (58,422)               (161,172)
                                                               ----------              ----------
Income (loss) before income tax provision...............         (253,645)               (289,690)
Income tax provision....................................            3,958                     209
                                                               ----------              ----------
Net income (loss).......................................       $ (257,603)             $ (289,899)
                                                               ==========              ==========
Basic/diluted income (loss) per share before............       $    (1.50)             $    (1.69)
                                                               ==========              ==========
OTHER OPERATING DATA:
Adjusted EBITDA.........................................       $  598,977              $  403,500
Adjusted EBITDA margin..................................               34%                     31%

Capital expenditures, excluding acquisitions............       $  477,078              $  282,593
Cash flows provided by operating activities.............          574,673                 332,563
Cash flows used in investing activities.................         (820,397)               (805,506)
Cash flows provided by financing activities.............          395,706                 698,882
Units in service at end of period(1)....................       17,030,000              16,088,000
</TABLE>

<TABLE>
<CAPTION>
                                                                                   PRO FORMA AS OF
                                                                                    SEPTEMBER 30,
                                                                                        1999
                                                                                   ---------------
<S>                                                           <C>                  <C>
BALANCE SHEET DATA:
Current assets..............................................                         $  272,222
Total assets................................................                          3,041,110
Long-term debt, less current maturities.....................                          1,802,141
Stockholders' equity........................................                            755,123
</TABLE>

- ---------------

(1) Units in service is calculated by adding the Arch, PageNet and MobileMedia
    (for December 31, 1998) amounts less an elimination for inter-company units
    in service.

                                       23
<PAGE>   34

     The following table reconciles Arch's net income (loss) to the presentation
of Arch's pro forma adjusted EBITDA:

<TABLE>
<CAPTION>
                                                                                      PRO FORMA
                                                                 PRO FORMA           NINE MONTHS
                                                                YEAR ENDED              ENDED
                                                             DECEMBER 31, 1998    SEPTEMBER 30, 1999
                                                             -----------------    ------------------
<S>                                                          <C>                  <C>
Net income (loss)..........................................      $(257,603)           $(289,899)
Interest and other expense (income)........................         58,422              161,172
Income tax provision.......................................          3,958                  209
Depreciation and amortization..............................        697,337              501,482
Provision for asset impairment.............................             --               17,798
Restructuring and bankruptcy expenses......................         96,863               12,738
                                                                 ---------            ---------
Adjusted EBITDA............................................      $ 598,977            $ 403,500
                                                                 =========            =========
</TABLE>

                                       24
<PAGE>   35

                                   THE MERGER

GENERAL

     Arch and PageNet have agreed to merge on the terms set forth in the
agreement and plan of merger dated November 7, 1999, as amended, which is
attached to this joint proxy statement/prospectus as Annex A. Through the
merger, PageNet will become a wholly owned subsidiary of Arch. The merger will
be accompanied by a recapitalization of Arch and PageNet resulting from the
exchange of debt for common stock in the Arch and PageNet exchange offers.

     The merger agreement provides that:

     - PageNet will merge with a wholly owned subsidiary of Arch. In the merger,
       each share of PageNet common stock, including shares issued to PageNet
       senior subordinated noteholders in the PageNet exchange offer, will be
       converted into 0.1247 shares of Arch common stock and Arch expects to
       issue a total of 89,882,637 shares;

     - Arch will conduct the Arch exchange offer, offering to exchange 66.1318
       shares of Arch common stock for each $1,000 principal amount at maturity
       of its discount notes. If all of the outstanding discount notes are
       exchanged, Arch will issue a total of 29,651,984 shares of its common
       stock;

     - All of Arch's outstanding Series C preferred shares are proposed to be
       converted into a total of 2,104,142 shares of Arch's common stock;

     - PageNet will conduct the PageNet exchange offer, offering to exchange a
       total of 616,830,757 shares of PageNet common stock, which will be
       immediately exchanged for Arch common stock in the merger, and 68.9% of
       the equity interest in Vast (subject to the possibility of dilution) for
       all of PageNet's outstanding senior subordinated notes;

     - PageNet will distribute 11.6% of the equity interest in Vast (subject to
       the possibility of dilution) to the holders of PageNet common stock in
       connection with the merger; and

     - The Arch board of directors, after the merger, will consist of 12
       directors. Six directors will be designated by the current Arch directors
       and three directors will be designated by the current PageNet directors.
       Each of the three largest holders of PageNet notes being exchanged for
       shares of PageNet common stock may also designate one director. To the
       extent any of these three largest holders do not designate directors, the
       current Arch directors will designate additional directors.

BACKGROUND OF THE MERGER

     At a board of directors meeting on June 10, 1999, the directors of PageNet
discussed the possibility of a combination of PageNet with another major paging
company which had indicated in a discussion between its chief executive officer
and John P. Frazee, Jr., PageNet's chief executive officer, that it was
interested in exploring the possibility of a combination with PageNet. Mr.
Frazee advised the directors that he believed such a combination could offer
substantial synergies and cost savings. Mr. Frazee said he had discussed the
possible combination with representatives of Goldman, Sachs & Co. and Morgan
Stanley Dean Witter, which had been acting as PageNet's outside financial
advisors with respect to possible strategic options, and that representatives of
both Goldman Sachs and Morgan Stanley considered such a transaction to be
possible. The directors supported continued discussion with the other paging
company about a possible combination.

     On June 10, PageNet entered into a confidentiality agreement with the other
paging company permitting the exchange of confidential information. Management
personnel, lawyers and investment bankers from both companies subsequently met
during June and July to conduct mutual due diligence, to further evaluate and
analyze potential synergies and savings and to discuss various aspects of a
possible combination.

                                       25
<PAGE>   36

     At a meeting on July 22, the PageNet directors again discussed the
possibility of a combination with the other paging company. Representatives of
Goldman Sachs and Morgan Stanley reviewed with the PageNet directors the overall
industry trends, PageNet's strategic and financial position and the prospective
combination. The directors concluded that a combination with the other paging
company appeared to be desirable if acceptable financial terms, which had not
yet been discussed, could be negotiated. After that meeting, due diligence and
other discussions with the other paging company continued.

     In early August 1999, representatives of Goldman Sachs and Morgan Stanley
met with the financial advisors for the other paging company to discuss possible
financial terms of a combination and reported the outcome of such discussions to
Mr. Frazee. Mr. Frazee then reported the outcome of those discussions to the
directors. The directors concluded, based upon that meeting, that agreement on
acceptable terms would not be possible. Mr. Frazee said that he continued to
believe that a combination of PageNet with another major paging company was
highly desirable and he recommended that PageNet approach Arch about a possible
combination with PageNet. The directors supported such an approach to Arch.

     On August 6, Mr. Frazee met with C. Edward Baker, Jr., chief executive
officer of Arch, to discuss the possibility of a business combination between
Arch and PageNet.

     At a meeting on August 10, the Arch directors discussed the possibility of
further consolidation within the wireless communications industry and the role
that Arch might play in such consolidation. It was the consensus of the
directors that Mr. Baker should continue discussions with PageNet concerning a
possible business combination.

     On August 17, Mr. Frazee, Edward W. Mullinix, Jr., chief operating officer
of PageNet, and Julian B. Castelli, chief financial officer of PageNet, met with
Mr. Baker and J. Roy Pottle, chief financial officer of Arch. Mr. Baker and Mr.
Frazee agreed that the two companies should explore the possibility of a
combination.

     On August 26, Arch and PageNet entered into a confidentiality agreement
permitting the mutual exchange of confidential information. On that date
management of Arch and PageNet, together with representatives of Goldman Sachs
and Morgan Stanley and Bear Stearns & Co., Arch's financial advisor, as well as
outside counsel for both companies, met to review potential cost savings and
synergies and to discuss structural and legal aspects of a possible combination.
In early September, Mr. Frazee and Mr. Baker had further conversations about a
possible combination.

     During the week of September 6, the chief executive officer of the other
paging company contacted Mr. Frazee and indicated a strong desire to resume
discussions of a possible combination. Mr. Frazee reported that contact to the
PageNet directors at a board meeting on September 13. Mr. Frazee said that
representatives of Goldman Sachs and Morgan Stanley had talked with the other
paging company's financial advisors and believed there was now serious interest
in a possible combination. The directors discussed the possible combination with
the other paging company and also reviewed the discussions which had occurred
with Arch.

     At the meeting on September 13, PageNet's directors also discussed
PageNet's financial condition and concluded that PageNet needed additional
outside financial advice because the continued failure to reverse continued
declining revenues or sufficiently reduce operating costs, based upon
preliminary third quarter results of operations, potentially threatened
PageNet's liquidity and compliance with bank credit agreements and bond
indentures. After that meeting, PageNet engaged Houlihan Lokey Howard & Zukin
Capital as an additional financial advisor to advise PageNet with respect to the
possible need for a recapitalization or other form of debt restructuring on a
standalone basis or on the possibility that PageNet might seek to combine such a
recapitalization with a merger with the other paging company or with Arch.
Goldman Sachs, Morgan Stanley and Houlihan Lokey then resumed discussion with
the other paging company's financial advisors about the possible terms of a
combination.

     At a meeting of the Arch directors on September 28, Mr. Baker reported on
the status of discussions with PageNet concerning a possible business
combination, noting that such discussions remained very general. It was the
consensus of the directors that Mr. Baker should continue such discussions.
                                       26
<PAGE>   37

     At a meeting of the PageNet board on October 1, representatives of Houlihan
Lokey, Goldman Sachs and Morgan Stanley reviewed with the PageNet directors
various possible alternatives, including PageNet's going forward without
significant change in capital structure, the possibility of a standalone
recapitalization, a potential merger without a recapitalization and a potential
merger coupled with a recapitalization. The directors discussed the various
options and concluded that a merger coupled with a recapitalization appeared to
be the best alternative for all of PageNet's stakeholders, including its
noteholders and stockholders. The directors discussed with the financial
advisors the possible structure of such a transaction and the risks and other
difficulties associated with its consummation. The advisors indicated that they
had discussed the possibility of such a combined merger and recapitalization
with the other paging company, which was interested in pursuing such a
transaction. The directors authorized management and the advisors to seek to
negotiate such a transaction with the other paging company, recognizing that,
depending on the course of those negotiations, PageNet might also want to
discuss such a transaction with Arch.

     Following that board meeting on October 1, PageNet's management, financial
advisors and lawyers met with management, financial advisors and lawyers for the
other paging company. Negotiations toward possible agreement on the terms of a
transaction that would combine a merger with a recapitalization through exchange
offers by both companies continued actively until the week of October 11, 1999.
During that week, the other paging company communicated to PageNet, through its
financial advisors, revised proposed financial terms of the transaction which
were different and less favorable to PageNet than the terms previously
discussed. In light of that change, and because of continuing uncertainty about
whether agreement on financial and other aspects of the transaction could be
reached and whether the transaction could be consummated, the directors decided
that PageNet should contact Arch to determine if a transaction with Arch might
be possible that would be more favorable to PageNet's stakeholders.

     On October 15, Mr. Frazee and representatives of Houlihan Lokey met with
Mr. Baker and representatives of Bear Stearns. Mr. Baker indicated a strong
desire to try to negotiate a combination between Arch and PageNet. Following
that meeting, the financial advisors for Arch and PageNet continued to discuss
proposed financial terms of such a combination transaction.

     On an October 17 conference call, Mr. Baker provided an update to certain
Arch directors on discussions with PageNet and its financial advisors. Mr. Baker
noted that the financial advisors had discussed a business combination involving
a simultaneous merger and recapitalization of both companies to be accomplished
through exchange offers with certain existing noteholders. Mr. Baker reported
that no consensus as to the allocation of the equity of a combined entity
between the Arch and PageNet stockholders had emerged. Thereafter, Mr. Baker
contacted other Arch directors and provided similar updates.

     At a board meeting on October 24, Goldman Sachs, Morgan Stanley and
Houlihan Lokey reviewed with the PageNet directors the proposed terms of a
possible merger with Arch and discussed various factors relating to the
likelihood of successfully consummating such a transaction. The directors
determined that the proposed merger with Arch appeared to be more favorable for
PageNet and all of its stakeholders than the proposed transaction with the other
paging company and also appeared to be more likely to be consummated
successfully. The directors directed management and PageNet's legal and
financial advisors to proceed as rapidly as possible to seek to negotiate an
agreement for such a merger with Arch.

     At a meeting of the Arch directors on October 25, Mr. Baker reported on the
status of the continuing discussions with PageNet, including proposed terms of a
possible merger and recapitalization and the resultant allocation of equity
between the Arch and PageNet stakeholders. The directors determined that
management and Arch's advisors should proceed with due diligence investigations
and negotiation of a merger agreement.

     During the following week, management teams from Arch and PageNet met to
review potential cost savings and synergies. In addition, financial advisors,
legal counsel and management personnel from both companies carried out mutual
due diligence investigations. Negotiations by the respective managements,
                                       27
<PAGE>   38

financial advisors and counsel over the terms of a merger agreement between Arch
and PageNet then proceeded intensively until a proposed definitive agreement was
reached.

     At meetings held on November 1 and 2, management, Bear Stearns and Arch's
counsel reviewed with the Arch directors the proposed terms of a business
combination with PageNet, including a draft of a proposed merger agreement. The
directors received a presentation from Bear Stearns concerning the potential
benefits and risks of a merger, a financial profile of PageNet, a pro forma
analysis of a combined entity, the relative contributions of Arch and PageNet in
relation to the proposed enterprise value allocation in the combined entity and
pro forma discounted cash flow, or DCF, equity values that might be realized by
existing Arch stockholders under the merger in comparison with the pro forma DCF
equity value to existing Arch stockholders on a standalone basis. Management and
the financial and legal advisors to Arch were directed to seek to finalize the
terms of a definitive agreement relating to the proposed merger.

     The directors of PageNet met on November 7 to consider the proposed merger
agreement. At that meeting the directors reviewed the potential benefits and
risks associated with the merger, the estimated values to be realized by
PageNet's stockholders and bondholders under the merger in comparison to the
possible transaction with the other paging company and standalone alternatives,
the relative contributions of Arch and PageNet in relation to the shares in the
combined enterprise to be received by their respective stakeholders, the
likelihood of consummation of the merger, the future prospects of the combined
company and various other matters. At the meeting, representatives of each of
Houlihan Lokey, Goldman Sachs and Morgan Stanley provided their formal analysis
regarding the proposed transaction. After discussion, each of Houlihan Lokey and
Morgan Stanley gave its oral opinion that as of November 7, the consideration to
be received by the holders of PageNet common stock on such date pursuant to the
merger and the spinoff, taken as a whole, was fair from a financial point of
view and Goldman Sachs gave its oral opinion that as of November 7, 1999, the
exchange ratio pursuant to the merger agreement was fair from a financial point
of view to the holders of PageNet common stock as of such date. Houlihan Lokey,
Goldman Sachs and Morgan Stanley then indicated that they would confirm their
opinion in writing. Representatives of Mayer, Brown & Platt, outside counsel to
PageNet, reviewed with the PageNet directors the terms of the proposed merger
agreement. After receiving advice from their financial and legal advisors and
further deliberations, and taking into account the various factors described
below under "-- PageNet's Reasons for Merger," the directors unanimously
approved the proposed merger on the evening of November 7.

     The directors of Arch met on November 7 to consider the proposed merger
agreement. At that meeting management and legal counsel reported on changes to
the merger agreement from the draft previously reviewed and the directors
received an update of the Bear Stearns presentation delivered at the November 2
meeting. After receiving further advice from its legal and financial advisors,
including an oral opinion (subsequently confirmed in writing) from Bear Stearns
that the exchange ratio as described in the merger agreement was fair, from a
financial point of view, to the stockholders of Arch, the Arch directors
unanimously approved the proposed merger in the evening of November 7.

     Later in the evening of November 7, the merger agreement was executed by
Arch and PageNet.

     On January 7, 2000 the parties amended the merger agreement (1) to reduce
the amount of senior secured debt financing that Arch and PageNet must obtain in
order to effect the merger from $1.5 billion to $1.3 billion, and (2) to
increase the percentage of its total common equity that Vast may set aside for
an employee stock option, stock ownership or other similar plan from 15% to 20%.

ARCH'S REASONS FOR THE MERGER; RECOMMENDATION OF ARCH'S BOARD OF DIRECTORS

     Arch's board of directors believes that the merger represents a strategic
opportunity to significantly expand the size and scope of Arch's operations,
while substantially decreasing Arch's overall financial leverage. Together,
these two benefits should enable Arch to more quickly and efficiently begin to
offer new wireless communication products and services to its customers. The
board believes that, following the merger, Arch will have greater financial
strength, operational efficiencies and growth potential than either Arch or
PageNet would have on its own. This is because of the complementary nature of
PageNet's
                                       28
<PAGE>   39

systems and software resources and Arch's customer base and marketing abilities.
Arch's board has identified a number of potential benefits of the proposed
merger that it believes will contribute to the success of the combined entities,
including the following:

     - The combination of Arch and PageNet would create a company better able to
       move into the emerging technologies that its competitors are utilizing
       presently. Given high fixed infrastructure costs associated with building
       out N-PCS networks, greater scale should permit increased efficiencies
       and improved margins for the combined company allowing more rapid and
       efficient transition into the provision of advanced communications
       services.

     - Arch would have access to PageNet's existing N-PCS network which, in
       combination with Arch's customer base and marketing abilities, should
       allow Arch to bring new N-PCS services to market and sell them more
       quickly and effectively.

     - Together Arch and PageNet should be better positioned to obtain
       commitments from manufacturers such as Motorola to create devices capable
       of functioning on the new N-PCS network.

     - Arch's overall leverage should be reduced substantially as a result of
       the merger. Arch's ratio of consolidated total debt to adjusted EBITDA
       (based on annualized adjusted EBITDA for the three months ended September
       30, 1999) was 5.2:1 as of September 30, 1999; on a pro forma basis,
       taking into account the merger, but excluding the impact of expected
       operational cost synergies, the leverage ratio for the combined company
       as measured by the ratio of total debt to annualized adjusted pro forma
       EBITDA for the nine months ended September 30, 1999 would have been
       3.4:1.

     - Significant operational efficiencies could be realized through the
       integration and combination of operations and the sharing of outlays in
       future infrastructure investments.

     - Greater scale should yield enhanced purchasing power and improved sales
       distribution.

     - Following the merger, Arch would have a significantly stronger capital
       structure and financial resources providing greater operating
       flexibility, as well as enhancing Arch's capabilities to further
       effectuate its strategic objective to participate in the fast-paced,
       constantly changing wireless communications industry.

     - Arch's larger market capitalization and size may result in broader
       research coverage and increased interest by institutional investors.

     In reaching its decision to approve the merger agreement, the merger and
the other transactions contemplated by the merger agreement, Arch's board of
directors also considered, in addition to the factors described above:

     - information concerning the financial performance and condition, business
       operations, capital and prospects of each of Arch and PageNet on a
       stand-alone basis as well as a combined basis;

     - current industry, economic and market trends, including the likelihood of
       increasing and broadening competition in the wireless communications
       industry;

     - the structure of the merger and the terms of the merger agreement;

     - the opinion of Bear Stearns that the exchange ratio is fair, from a
       financial point of view, to the stockholders of Arch;

     - the importance of market position, significant scale and scope and
       financial resources to Arch's ability to compete effectively in the
       future;

     - the valuation ascribed Arch's common stock in the merger agreement and
       the valuation implied for the combined entity based on currently
       prevailing market multiples; and

     - the relative contributions of Arch and PageNet to the net revenues and
       EBITDA of the combined company.
                                       29
<PAGE>   40

     Arch's board also considered potential risks relating to the merger,
including:

     - the risk that the benefits and synergies sought from the merger would not
       be fully achieved;

     - the management distraction inherent in integrating two business
       operations;

     - the risk that the merger would not be consummated and the possibility of
       incurring a $40.0 million termination fee in specified circumstances;

     - the requirement that Arch's common stockholders, preferred stockholders
       and discount noteholders and PageNet's stockholders and noteholders all
       approve or elect to participate in one or more aspects of the
       transaction;

     - the possibility that holders of outstanding Arch debt securities might
       object to the merger;

     - the limitations imposed by the merger agreement on the conduct of Arch's
       business prior to the merger, as well as the length of time projected for
       satisfying all closing conditions; and

     - the significant number of shares of Arch's common stock issuable in
       connection with the merger and related transactions and the consequent
       reduction in the voting power of Arch's current stockholders.

The Arch board believes that these risks were outweighed by the potential
benefits to be realized by the merger.

     The foregoing discussion of the information and factors considered by the
Arch board is not intended to be exhaustive but includes all material factors
considered by the Arch board. In view of the wide variety of information and
factors considered, the board did not find it practical to, and did not, assign
any relative or special weights to the foregoing factors, and individual
directors may have given differing weights to different factors.

PAGENET'S REASONS FOR THE MERGER; RECOMMENDATION OF PAGENET'S BOARD OF DIRECTORS

     PageNet's directors believe that the merger represents the most desirable
available alternative to maintain and realize value for PageNet and all of its
stakeholders, including its stockholders and noteholders. In reaching its
decision to approve the merger, the directors consulted with PageNet's financial
and legal advisors and took into account, without limitation, the following
conclusions and factors:

     - A combination of PageNet with another major messaging company is highly
       desirable, if not essential, to achieve cost savings and other synergies
       necessary to remain competitive in the wireless communications industry.
       Such savings from the Arch/PageNet combination are estimated at
       approximately $80 million annually, beginning approximately 18 months
       after the merger.

     - A substantial deleveraging of PageNet's capital structure is highly
       desirable, if not essential, to enable PageNet to continue to have the
       liquidity and other financial resources and flexibility needed to be a
       viable enterprise and to compete effectively in the wireless
       communications industry. The combined company after the merger will have
       a ratio of consolidated total debt to annualized adjusted EBITDA of
       approximately 3.4:1 (based on the nine months ended September 30, 1999
       and assuming the exchange of 100% of PageNet's senior subordinated notes
       and 100% of Arch's discount notes).

     - Achieving substantial deleveraging in conjunction with a combination with
       another major messaging company, because of the substantially higher
       aggregate enterprise value achieved through cost savings and synergies,
       is substantially more beneficial to PageNet and all of its stakeholders
       than any standalone recapitalization alternative.

                                       30
<PAGE>   41

     - The combination with Arch is the most desirable alternative available to
       PageNet and its stakeholders based upon the financial, managerial and
       other characteristics of the combined company and based upon the values
       expected to be realized by PageNet's noteholders and stockholders under
       the Arch transaction in comparison to any alternative.

     - While subject to substantial risks and uncertainties, the merger has a
       greater likelihood of successful consummation than the possible
       combination transaction with the other paging company.

     - The merger should achieve greater value for PageNet's noteholders and
       stockholders than stand-alone restructuring alternatives, whether
       consummated voluntarily or through a reorganization or bankruptcy
       proceedings.

     - No prospective acquiror or other merger partner, other than Arch and the
       other paging company, has expressed interest in discussing a possible
       combination transaction with PageNet.

     - PageNet's failure to reverse its continued decline in revenues, and its
       consequent loss of liquidity, makes it critical for PageNet to move
       forward to achieve a more viable capital structure.

     - The structure of the transaction enables PageNet's current noteholders
       and stockholders to retain an equity ownership in Vast, which may have
       future value if its wireless solutions business is successful.

     - The merger is structured as a "reorganization" for federal income tax
       purposes so that stockholders of PageNet will not recognize gain on the
       exchange of their shares for Arch's shares although it is expected that
       the receipt of Class B common stock of Vast will be taxable.

     - The oral opinions of Houlihan Lokey and Morgan Stanley, subsequently
       confirmed in writing that, as of November 7, the consideration to be
       received by the holders of PageNet common stock on such date pursuant to
       the merger and the spin-off, taken as a whole, was fair from a financial
       point of view to such holders and the oral opinion of Goldman Sachs,
       subsequently confirmed in writing, that, as of November 7, the exchange
       ratio pursuant to the merger agreement was fair from a financial point of
       view to the holders of PageNet common stock as of such date.

In approving the merger, the directors also took into account such additional
factors as the relative contributions of Arch and PageNet to the revenues and
EBITDA of the combined company, the historical and current trading prices of the
common stock of Arch and PageNet, valuations of other comparable companies and
overall trends in the paging business and the telecommunications industry.

     PageNet's directors also considered various potential risks relating to the
merger, including, without limitation, the following:

     - Various conditions to the merger, including the successful consummation
       of the exchange offers, the availability of continued bank financing
       following the merger, and the receipt of required regulatory approvals,
       may not be satisfied, and the merger may therefore not be able to be
       consummated.

     - It may be impossible to consummate the merger except through a
       prepackaged chapter 11 reorganization plan, and such plan may require
       consents which cannot be obtained or may not be approved by the
       bankruptcy court or, even if successful, may cause serious disruption of
       PageNet's business.

     - PageNet may not have sufficient liquidity to maintain its operations
       during the time necessary to consummate the merger.

     - A termination fee of $40.0 million is payable to Arch in certain
       circumstances, potentially imposing a substantial financial burden on
       PageNet.

     - The anticipated cost savings and other synergies may not be achieved, or
       management or other aspects of the two companies may not be successfully
       integrated, resulting in substantial reduction in the projected value of
       the combined enterprise.
                                       31
<PAGE>   42

     - The merger agreement imposes various limitations on the conduct of
       PageNet's business prior to the merger, which may make it more difficult
       for PageNet to respond to changing competitive or financial
       circumstances.

The directors concluded that the foregoing and other risks were outweighed by
the advantages of the merger.

     The discussion of the information and factors considered by PageNet's board
of directors is not intended to be exhaustive but includes all material factors
considered by PageNet's board of directors. In reaching its determination to
adopt and recommend the merger, PageNet's board of directors did not assign any
relative or specific weights to these factors, and individual directors may have
given differing weights to differing factors.

OPINION OF FINANCIAL ADVISOR TO ARCH

  Opinion of Bear Stearns & Co.

     Bear Stearns served as financial advisor to Arch in connection with the
merger and delivered an oral opinion (subsequently confirmed in writing) to
Arch's board of directors on November 7, 1999, that, as of that date, the
exchange ratio is fair, from a financial point of view, to the stockholders of
Arch. The opinion is based on and subject to several assumptions, limitations
and qualifications.

     THE FULL TEXT OF BEAR STEARNS' OPINION IS ATTACHED AS ANNEX B TO THIS JOINT
PROXY STATEMENT/ PROSPECTUS. ARCH STOCKHOLDERS SHOULD READ THE ENTIRE BEAR
STEARNS OPINION. THIS SUMMARY OF THE BEAR STEARNS OPINION IS SUBJECT TO THE FULL
TEXT OF THE OPINION.

     Arch imposed no limitations on the scope of Bear Stearns' investigation or
the procedures that Bear Stearns could follow in rendering its opinion. Arch did
not request Bear Stearns to make, and Bear Stearns did not make, any
recommendation to Arch's board as to the form or amount of the consideration
Arch is to pay to PageNet stockholders, after giving effect to the PageNet
exchange offer, in the merger, which was determined through arm's-length
negotiations between the principal parties. In arriving at its opinion, Bear
Stearns did not ascribe a specific range of values to Arch or PageNet, but
instead made its determination as to the fairness to the stockholders of Arch,
from a financial point of view, of the exchange ratio, on the basis of the
financial and comparative analyses described below. Bear Stearns' opinion is for
the use and benefit of the Arch's board and was rendered to Arch's board in
connection with its consideration of the merger. Bear Stearns' opinion is not
intended to be and does not constitute a recommendation to any holder of Arch
common stock, Class B common stock or Series C preferred stock as to how such
stockholder should vote on matters relating to the merger, or a recommendation
as to any related financing or restructuring transaction. Arch did not request
that Bear Stearns opine as to, and Bear Stearns' opinion does not address,
Arch's underlying business decision to proceed with or effect the merger. All
parties should understand that, although subsequent developments may affect the
conclusions reached in Bear Stearns' opinion, Bear Stearns does not have any
obligation to, and does not intend to, update, revise or reaffirm its opinion.

     In arriving at its opinion, Bear Stearns reviewed and analyzed:

     - the merger agreement, in substantially final form;

     - historical financial information regarding both Arch and PageNet,
       including Arch's and PageNet's annual reports to stockholders and annual
       reports on Form 10-K for the years ended December 31, 1996 through 1998,
       and their quarterly reports on Form 10-Q for the periods ended March 31
       and June 30, 1999, and all reports on Form 8-K of Arch and PageNet for
       the period commencing January 1, 1996 through November 7, 1999;

     - operating and financial information provided by management of both Arch
       and PageNet relating to Arch's and PageNet's respective businesses and
       prospects, including projections and synergy estimates and the
       projections for the combined company and other forward-looking
       information;

                                       32
<PAGE>   43

     - publicly available financial data and stock market performance data and
       valuation analyses of public companies that Bear Stearns considered
       generally comparable to Arch and PageNet or otherwise relevant to its
       inquiry;

     - the financial terms that were publicly available of certain mergers and
       acquisitions of companies Bear Stearns considered generally comparable to
       Arch and PageNet; and

     - certain estimates of anticipated cost savings, capital expenditure
       avoidance and other benefits (collectively, the "Merger Benefits")
       expected to result from the merger, jointly prepared and provided to Bear
       Stearns by management of both Arch and PageNet.

     In addition, Bear Stearns met separately and/or jointly with certain
members of management from both Arch and PageNet to discuss:

     - the current paging industry landscape and competitive dynamics related
       thereto,

     - each company's operations, historical financial statements, future
       prospects and financial condition,

     - their views of the business, operational and financial rationale for, and
       expected strategic benefits and other implications of, the merger and

     - the combined company projections and the Merger Benefits. Bear Stearns
       also conducted such other studies, analyses, inquiries and investigations
       as it considered appropriate.

     Arch and PageNet management made financial and other information available
to Bear Stearns, and Arch management made assurances to Bear Stearns that they
were not aware of any facts that would make financial or other information, the
combined company projections or the Merger Benefits incomplete or misleading in
any material respect that Bear Stearns used to conduct its review. In arriving
at its opinion, Bear Stearns assumed that the financial and other information,
the assurances of management and the publicly available information were
accurate and complete.

     Bear Stearns assumed that management of Arch reasonably prepared the
projections for the combined company and the Merger Benefits on bases reflecting
their best currently available estimates and judgments of the anticipated future
performance of Arch and PageNet and of the anticipated Merger Benefits that
could be achieved within the time frames forecast. Bear Stearns did not
undertake an independent evaluation or appraisal of any of the assets or
liabilities of Arch or PageNet nor was Bear Stearns furnished with any such
evaluation or appraisal. Bear Stearns did not assume any obligation to conduct,
nor did it conduct, any physical inspection of the properties or facilities of
Arch or PageNet. Bear Stearns assumed that the transactions will be consummated
in accordance with the terms described in the merger agreement, without any
waiver of any material condition and with all necessary material consents and
approvals without any limitations, restrictions, conditions, amendments or
modifications that collectively would have a material effect on Arch, PageNet or
the Merger Benefits. Bear Stearns based its opinion upon market, economic and
other conditions as they existed on, and could be evaluated as of, the date of
its opinion.

     The following is a summary of certain financial and comparative analyses
that Bear Stearns performed and presented to the Arch Board.

     Incremental DCF Equity Value Analysis (Based on Discounted Cash Flow
Analysis)

     Bear Stearns used projections for Arch on a stand-alone basis and for the
combined company provided by the Arch management team and compared the
discounted cash flow, or DCF, equity value per existing Arch share using
analyses of cash flows discounted by percentages for Arch, on a stand-alone
basis, and for the combined company. The comparison took into effect the
exchange for equity of 100% of the Arch 10 7/8% senior discount notes, the Arch
Series C preferred stock and all of the PageNet senior subordinated notes
(collectively, the "Restructurings"). Bear Stearns calculated the range of DCF
equity values per existing Arch share for both Arch on a stand-alone basis and
the combined company using a discount rate range of 14% to 18% and multiples of
2004 earnings before interest, taxes, depreciation and amortization ("EBITDA")
ranging between 5.0x and 7.0x ("terminal multiples"). Bear Stearns presented
                                       33
<PAGE>   44

the analysis to the Arch board of directors and highlighted the comparative
results, assuming 5.5x, 6.0x and 6.5x terminal multiples of 2004 projected
EBITDA and 14% and 16% discount rates, and that Arch stockholders would own
29.6% of the combined company (as determined by using the negotiated exchange
ratio). The DCF equity value per share of Arch stand-alone assuming a 14%
discount rate and 5.5x, 6.0x, and 6.5x projected 2004 EBITDA terminal multiples
were $6.64, $8.59 and $10.16 respectively; and using the same assumptions,
except assuming a 16% discount rate, the DCF equity values per share were $4.29,
$6.07 and $7.86, respectively. The pro forma DCF equity value per existing Arch
share of the combined company, assuming a 14% discount rate, 5.0x, 6.0x and 6.5x
projected 2004 EBITDA terminal multiples, and ownership by existing Arch
stockholders of 29.6% of the combined company, were $11.17, $12.25 and $13.32,
respectively. Using the same assumptions, except assuming a 16% discount rate,
the pro forma DCF equity values per existing Arch share of the combined company
were $9.87, $10.85 and $11.84, respectively. Bear Stearns also performed the
same analysis assuming that only 66 2/3% of the Arch 10 7/8% senior discount
noteholders and 66 2/3% of the Arch Series C preferred stockholders exchanged
their securities for combined company equity. Based on this estimated amount of
senior discount notes and Series C preferred stock exchanged and the exchange
ratio for PageNet shares, the existing Arch stockholders would own 31.4% of the
combined company. Based on these new assumptions, pro forma DCF equity values
per existing Arch share of the combined company, assuming a 14% discount rate,
5.0x, 6.0x and 6.5x projected 2004 EBITDA terminal multiples, were $11.06,
$12.19 and $13.33, respectively. Using the same assumptions, except assuming a
16% discount rate, the pro forma DCF equity values per existing Arch share of
the combined company were $9.68, $10.72 and $11.76, respectively.

     CONTRIBUTION ANALYSIS

     Bear Stearns used the projections for Arch alone provided by the Arch
management team and for PageNet, as adjusted by the Arch management team, to
perform a contribution analysis. Bear Stearns analyzed the relative contribution
to combined estimated net revenues and EBITDA for Arch and PageNet for the years
1999 through 2003. This analysis indicated that in 1999, 2000, 2001, 2002 and
2003, Arch would contribute 45%, 48%, 50%, 51% and 51%, respectively, and
PageNet would contribute 55%, 52%, 50%, 49% and 49%, respectively, of estimated
net revenues. This analysis also indicated that in 1999, 2000, 2001, 2002 and
2003, Arch would contribute 49%, 50%, 49%, 48% and 49%, respectively, PageNet
would contribute 51%, 48%, 45%, 45% and 44%, respectively, and Merger Benefits
are expected to contribute 0%, 2%, 6%, 7% and 7%, respectively, of estimated
EBITDA. Bear Stearns compared the relative contributions to Arch stockholders'
percentage of combined enterprise value assuming both current market value of
remaining debt (assuming effect of restructuring) and current book value of
remaining debt. Based on these two calculations, Arch stockholders would
represent, assuming market value debt and book value of debt, 51% and 54%,
respectively, of the enterprise value of the combined company.

     The summary is not a complete description of the analyses that Bear Stearns
performed or its presentation to Arch's board, but it describes in summary form
the principal elements of the analyses that Bear Stearns performed in connection
with the delivery of its opinion to Arch's board. The preparation of a fairness
opinion involves various determinations as to the most appropriate and relevant
methods of financial and comparative analysis and the application of those
methods to the particular circumstances and, therefore, a fairness opinion
cannot easily be described. Furthermore, in arriving at its opinion, Bear
Stearns did not attribute any particular weight to any analysis or factor
considered by it, but instead it made qualitative judgments as to the
significance and relevance of each analysis and factor. Accordingly, Bear
Stearns believes that its analyses must be considered as a whole and that
considering any portion of such analyses and factors, without considering all
analyses and factors, could create a misleading or incomplete view of the
process underlying its opinion. In its analyses, Bear Stearns made numerous
assumptions about industry performance, general business and economic conditions
and other matters, many of which are beyond the control of Arch and PageNet. Any
estimates contained in these analyses do not necessarily indicate actual values
or predict future results or values, which may be significantly more or less
favorable than as described in the opinion. In addition, analyses relating to
the value of businesses are not appraisals and do not reflect the prices at
which businesses actually may be sold.

                                       34
<PAGE>   45

     Based on and subject to the foregoing, it is Bear Stearns' opinion that, as
of the date hereof, the exchange ratio is fair, from a financial point of view,
to the stockholders of Arch.

     Bear Stearns is an internationally recognized investment banking firm and,
as part of its investment banking activities, is regularly engaged in the
evaluation of businesses and their securities in connection with mergers and
acquisitions, negotiated underwritings, competitive bids, secondary
distributions of listed and unlisted securities, private placements and
valuations for corporate and other purposes. Arch's board selected Bear Stearns
because of its expertise, reputation and familiarity with Arch in particular and
the telecommunications industry in general and because its investment banking
professionals have substantial experience in transactions similar to the merger.

     As compensation for its services in connection with the merger, Arch has
agreed to pay Bear Stearns fees for acting as financial advisor in connection
with the merger, including rendering its opinion. These fees include:

     - $650,000 in retainer fees, a progress fee payment, and an opinion fee,
       which have been paid to date;

     - an additional fee, currently estimated at $9.3 million, based on the
       "total transaction value", as defined; this fee is payable upon
       consummation of the merger, and the fees described above will be credited
       against it.

     If the merger is not consummated, but Arch receives a "break-up" fee or
other payment as a result of the termination or cancellation of Arch's efforts
to effect the merger, Arch will pay Bear Stearns a cash fee equal to the lesser
of $3.0 million or 20% of such fee or payment. In addition, Arch has agreed to
reimburse Bear Stearns for reasonable out-of-pocket expenses incurred in
connection with the merger and to indemnify Bear Stearns and certain related
persons for certain liabilities that may arise out of its engagement by Arch and
the rendering of its opinion.

     In the ordinary course of its business, Bear Stearns may actively trade in
Arch and/or PageNet debt and equity securities for its own account and for the
accounts of its customers and, accordingly, may at any time hold a long or short
position in such securities.

OPINIONS OF FINANCIAL ADVISORS TO PAGENET

  Opinion of Houlihan, Lokey, Howard & Zukin Capital

     Under a letter agreement, dated September 22, 1999, the board of directors
of PageNet retained Houlihan Lokey to assist it in evaluating its strategic
alternatives. As part of this engagement, PageNet requested that Houlihan Lokey
evaluate the fairness of the consideration to be received in the merger and the
related transactions by the holders of shares of PageNet common stock, holding
shares as of the date of the opinion. On November 7, 1999, at a special meeting
of the board of directors of PageNet, Houlihan Lokey presented its financial
analyses and delivered its oral opinion that, as of that date, the shares of
Arch common stock and the equity interest in Vast, taken together as a whole, to
be received by the holders of PageNet common stock, as of that date, in the
merger and related transactions, was fair to such holders from a financial point
of view. Houlihan Lokey confirmed its oral opinion by delivering a written
opinion dated November 7, 1999, which stated the considerations and assumptions
upon which its opinion was based.

     Although Houlihan Lokey assisted the PageNet board of directors in
evaluating the terms of the financial restructuring, Houlihan Lokey was not
retained to provide, and Houlihan Lokey did not provide, an opinion as to the
fairness, advisability or relative values to be achieved as a result of the
financial restructuring. In addition, Houlihan Lokey was not retained to
provide, and did not provide, an opinion regarding the underlying business
decision of PageNet to effect the merger or the financial restructuring.

     A COPY OF THE HOULIHAN LOKEY OPINION, DATED NOVEMBER 7, 1999, IS ATTACHED
AS ANNEX C TO THIS JOINT PROXY STATEMENT/PROSPECTUS. YOU ARE URGED TO READ THE
OPINION IN ITS ENTIRETY FOR INFORMATION WITH RESPECT TO THE PROCEDURES FOLLOWED,
ASSUMPTIONS MADE, MATTERS CONSIDERED AND LIMITS OF THE REVIEW BY, HOULIHAN LOKEY
IN MAKING ITS OPINION. REFERENCES IN THIS DOCUMENT TO THE HOULIHAN LOKEY OPINION
AND

                                       35
<PAGE>   46

THE SUMMARY OF THE HOULIHAN LOKEY OPINION SET FORTH BELOW ARE QUALIFIED BY
REFERENCE TO THE FULL TEXT OF THE OPINION, WHICH IS INCORPORATED IN THIS JOINT
PROXY STATEMENT/PROSPECTUS BY REFERENCE. HOULIHAN LOKEY'S WRITTEN OPINION IS FOR
THE INFORMATION AND ASSISTANCE OF THE PAGENET BOARD OF DIRECTORS AND DOES NOT
CONSTITUTE A RECOMMENDATION AS TO HOW ANY HOLDERS OF COMMON STOCK OF PAGENET
SHOULD VOTE WITH RESPECT TO THE MERGER OR HOW ANY HOLDERS OF DEBT SECURITIES OF
PAGENET SHOULD VOTE WITH RESPECT TO THE FINANCIAL RESTRUCTURING.

     In arriving at its opinion, Houlihan Lokey, among other things:

     - reviewed PageNet's (a) Annual Report to Stockholders and Annual Report on
       Form 10-K for the fiscal year ended 1998, (b) Quarterly Reports on Form
       10-Q for the two quarters ended March 31, 1999 and June 30, 1999, (c)
       company-prepared interim financial statements for the period ended
       September 30, 1999, which PageNet's management has identified as being
       the most current financial statements available, (d) Proxy Statement
       dated April 12, 1999, and (e) certain other documents filed with the
       Securities and Exchange Commission;

     - reviewed Arch's Annual Reports to Stockholders and Annual Reports on Form
       10-K for the past two fiscal years, certain interim reports to
       stockholders on Form 10-Q of Arch, and certain documents filed with the
       SEC by Arch regarding its acquisition of MobileMedia;

     - reviewed the merger agreement;

     - reviewed the Indenture dated July 15, 1995 of the 10% senior subordinated
       notes due October 15, 2008, supplemented by a second supplemental
       Indenture dated October 15, 1996;

     - reviewed the Indenture dated July 15, 1995 of 10.125% senior subordinated
       notes due August 1, 2007, supplemented by a First Supplemental Indenture
       dated July 15, 1995;

     - reviewed the Indenture dated January 15, 1994 of 8.875% senior
       subordinated notes due February 1, 2006, supplemented by a first
       supplemental Indenture dated January 15, 1994;

     - reviewed the Second Amended and Restated Credit Agreement of PageNet and
       certain of its Subsidiaries, the Amended and Restated Loan Agreement of
       Paging Network of Canada Inc., and certain other documents;

     - met with members of senior management of PageNet to discuss the
       operations, financial condition, future prospects and projected
       operations and performance of PageNet, and met with representatives of
       PageNet's independent accounting firm, other investment bankers and
       counsel to discuss certain matters;

     - visited PageNet's facilities and business offices of Arch and PageNet;

     - reviewed forecasts and projections prepared by PageNet's management for
       the years ended December 31, 1999 through 2004 and for the quarters ended
       September 30, 1999 through December 31, 2000;

     - reviewed certain forecasts and projections for Arch prepared by its
       management;

     - reviewed analyses prepared by and met with management of Arch and PageNet
       to discuss expected costs savings and other expected synergies resulting
       from the business combination;

     - reviewed the historical market prices and trading volume for Arch's and
       PageNet's publicly traded securities;

     - reviewed other publicly available financial data for companies that
       Houlihan Lokey deemed comparable to PageNet, and publicly available
       prices and premiums paid in other transactions that Houlihan Lokey
       considered similar to the merger;

     - reviewed drafts of documents to be delivered at the closing of the
       merger; and

     - conducted other studies, analyses and inquiries as Houlihan Lokey deemed
       appropriate.

                                       36
<PAGE>   47

     In rendering its opinion, Houlihan Lokey assumed and relied upon, without
independent verification, the accuracy and completeness of all of the financial
and other information that was publicly available or supplied to Houlihan Lokey
by PageNet. Houlihan Lokey assumes no responsibility with respect to that
information. Houlihan Lokey also relied upon the advice of management of PageNet
that the financial forecasts and other information that were provided to or
discussed with Houlihan Lokey were reasonably prepared and reflected the best
currently available estimates of the future financial results and condition of
PageNet and that there had been no material change in the assets, financial
condition, business or prospects of PageNet since the date of the most recent
financial statements made available to Houlihan Lokey.

     Houlihan Lokey did not make any physical inspection or independent
appraisal of any of the properties or assets of PageNet. Houlihan Lokey's
opinion is necessarily based on business, economic, market and other conditions
as they existed on the date of its opinion. Houlihan Lokey has no duty or
obligation to advise PageNet or any other person of any change in any fact or
matter affecting its opinion of which it becomes aware after the date of its
opinion (except to the extent applicable law would require such disclosure).

     Houlihan Lokey also assumed that the merger would be completed according to
the terms of the merger agreement, without waiver of any condition contained in
that agreement, or any material modification to any of the terms contained in
that agreement.

     Houlihan Lokey performed a variety of financial and comparative analyses
solely for the purpose of providing its opinion to the PageNet board of
directors that the shares of Arch common stock and the equity interests in Vast,
taken together, to be received by PageNet stockholders in the merger and related
transactions is fair to them from a financial point of view. Preparing a
fairness opinion is a complex analytical process and is not readily susceptible
to partial analysis or summary description. Houlihan Lokey believes that its
analyses must be considered as a whole. Selecting portions of its analyses and
factors, without considering all analyses and factors, could create a misleading
or incomplete view of the processes underlying the analyses and its opinion.

     In its analyses, Houlihan Lokey made numerous assumptions with respect to
industry performance, general business, economic, market and financial
conditions and other matters, many of which are beyond the control of Arch and
PageNet. The estimates contained in these analyses and the valuation ranges
resulting from any particular analysis do not necessarily indicate actual values
or predict future results or values, which may be significantly more or less
favorable than those suggested by these analyses. In addition, analyses relating
to the value of the businesses or securities are not appraisals and do not
reflect the prices at which the businesses or securities may actually be sold or
the prices at which their securities may trade. As a result, these analyses and
estimates are inherently subject to substantial uncertainty.

     Houlihan Lokey's opinion and financial analyses were not the only factors
considered by the PageNet board of directors in its evaluation of the merger and
should not be viewed as determinative of the views of the PageNet board of
directors or management.

     Under the terms of Houlihan Lokey's engagement, PageNet has agreed to pay
Houlihan Lokey an advisory fee customary for the services provided in connection
with the merger and restructuring. Substantially all of this fee will not be
paid unless and until the merger and related transactions are completed. PageNet
has agreed to reimburse Houlihan Lokey for travel and other out-of-pocket
expenses incurred in performing its services, including the fees and expenses of
its legal counsel, and to indemnify Houlihan Lokey and related persons against
liabilities, including liabilities under the federal securities laws, arising
out of Houlihan Lokey's engagement.

     Houlihan Lokey is a nationally recognized investment banking firm and was
selected by PageNet based on Houlihan Lokey's experience and expertise with
respect to restructuring and merger and acquisition transactions. Houlihan Lokey
regularly engages in the valuation of businesses and their securities in
connection with restructuring and mergers and acquisitions.

                                       37
<PAGE>   48

  Opinion of Goldman, Sachs & Co.

     PageNet retained Goldman Sachs on August 1, 1999, to act as one of its
financial advisors in connection with the merger and the spin-off. Goldman Sachs
is an internationally recognized investment banking firm and was selected by
PageNet based on the firm's reputation and experience in investment banking in
general and its recognized expertise in the valuation of businesses, as well as
its prior investment banking relationship with PageNet. On November 7, 1999, at
the meeting of PageNet's board of directors, Goldman Sachs delivered to
PageNet's board its oral opinion (which was subsequently confirmed in a written
opinion dated as of November 7, 1999) that, as of such date and based on and
subject to the matters set forth therein, the exchange ratio pursuant to the
merger agreement was fair from a financial point of view to the holders of
PageNet common stock as of the date of its opinion.

     YOU SHOULD CONSIDER THE FOLLOWING WHEN READING THE DISCUSSION OF GOLDMAN
SACHS OPINION IN THIS DOCUMENT:

     - WE URGE YOU TO READ CAREFULLY THE ENTIRE OPINION OF GOLDMAN SACHS, WHICH
       IS SET FORTH IN ANNEX D OF THIS JOINT PROXY STATEMENT/PROSPECTUS AND IS
       INCORPORATED HEREIN BY REFERENCE.

     - GOLDMAN SACHS' ADVISORY SERVICES AND OPINION WERE PROVIDED TO PAGENET'S
       BOARD FOR ITS INFORMATION IN ITS CONSIDERATION OF THE MERGER AND THE
       OPINION WAS DIRECTED ONLY TO THE FAIRNESS OF THE EXCHANGE RATIO FROM A
       FINANCIAL POINT OF VIEW TO THE HOLDERS OF PAGENET COMMON STOCK AS OF THE
       DATE OF ITS OPINION.

     - GOLDMAN SACHS' OPINION DOES NOT CONSTITUTE A RECOMMENDATION TO ANY HOLDER
       OF PAGENET COMMON STOCK AS TO HOW TO VOTE ON THE MERGER OR ANY RELATED
       MATTER.

     In connection with its opinion, Goldman Sachs reviewed among other things,
the following:

     - the merger agreement;

     - the Annual Reports to Stockholders and Annual Reports on Form 10-K of
       Arch and PageNet for each of the previous five years;

     - certain interim reports to stockholders and Quarterly Reports on Form
       10-Q of Arch and PageNet;

     - certain other communications from Arch and PageNet to their respective
       stockholders;

     - certain historical financial information and other information for Vast;
       and

     - certain internal financial analyses and forecasts for PageNet, Vast and
       Arch prepared by their respective managements, including certain cost
       savings and operating synergies projected by the managements of Arch and
       PageNet to result from the transactions contemplated by the merger
       agreement (the "Synergies").

     Goldman Sachs also held discussions with members of the senior management
of Arch and PageNet regarding their assessment of the strategic rationale for,
and the potential benefits of, the transactions contemplated by the merger
agreement and with those persons and with members of the senior management of
Vast regarding the past and current business operations, financial condition and
future prospects of their respective companies. In addition, Goldman Sachs
reviewed the reported price and trading activity for the PageNet common stock
and the Arch common stock, compared certain financial and stock market
information for Arch and PageNet and certain financial information for Vast with
similar information for certain other companies the securities of which are
publicly traded, reviewed the financial terms of certain recent business
combinations in the paging and communications industry specifically and in other
industries generally and performed such other studies and analyses as it
considered appropriate. At the direction of PageNet's board, Goldman Sachs also
read certain analyses performed on behalf of PageNet by Houlihan Lokey regarding
(i) the proposed financial restructuring (the "Financial Restructuring"), in
which (A) certain outstanding debt securities of PageNet would be exchanged for
616.8 million shares of PageNet common stock and (B) certain outstanding debt
securities and preferred stock of Arch would be exchanged for 31.7 million
shares of Arch common stock and (ii) the possible

                                       38
<PAGE>   49

restructuring of PageNet's outstanding debt on a stand-alone basis (the
"Stand-Alone Restructuring"). Goldman Sachs also reviewed with PageNet and its
other financial advisors, including Houlihan Lokey, certain options available to
PageNet, other than alternative business combinations, for addressing PageNet's
liquidity needs. In addition, Goldman Sachs also reviewed the tax analysis
prepared by the management of PageNet and PageNet's accountants with respect to
the transactions contemplated by the merger agreement, including, without
limitation, the Financial Restructuring and the spin-off.

     Goldman Sachs relied upon the accuracy and completeness of all of the
financial and other information reviewed by it and assumed such accuracy and
completeness for purposes of rendering its opinion. In this regard, Goldman
Sachs assumed with the consent of PageNet's board that the financial forecasts,
including the underlying assumptions, provided to it and discussed with it with
respect to PageNet, Vast and Arch after giving effect to the transactions
contemplated by the merger agreement, including, without limitation, the
Synergies, have been reasonably prepared on a basis reflecting the best
currently available judgments and estimates of PageNet, Vast and Arch, as
applicable.

     Without making an independent evaluation of the matters contained therein
and with the consent of PageNet's board, Goldman Sachs relied upon the certain
analyses prepared by Houlihan Lokey referenced above for, among other things,
purposes of analyzing the impact of the Stand-Alone Restructuring on the holders
of the shares of PageNet common stock on the date of its opinion. In that
regard, Goldman Sachs also took into account the view of the management of
PageNet with respect to the likely impact of a Stand-Alone Restructuring on the
holders of the shares of PageNet common stock on the date of its opinion. In
addition, without making an independent evaluation of the matters contained
therein and with the consent of PageNet's board, Goldman Sachs relied upon the
tax analysis prepared by the management of PageNet and PageNet's accountants
referenced above.

     Goldman Sachs did not make an independent evaluation or appraisal of the
assets and liabilities of PageNet, Vast or Arch or any of their subsidiaries and
Goldman Sachs was not furnished with any such evaluation or appraisal. Goldman
Sachs' opinion does not address the relative merits of the transactions
contemplated pursuant to the merger agreement as compared to any alternative
business transaction that might be available to PageNet. Goldman Sachs' opinion
was provided for the information and assistance of PageNet's board in connection
with its consideration of the transactions contemplated by the merger agreement
and such opinion does not constitute a recommendation as to how any holder of
PageNet common stock should vote with respect to such transactions. Goldman
Sachs' opinion was necessarily based upon conditions as they existed and could
be evaluated by it on the date of its opinion and Goldman Sachs assumed no
responsibility to update or revise its opinion based upon circumstances and
events occurring after the date of its opinion. Goldman Sachs' opinion does not
imply any conclusion as to the likely trading range of Arch common stock or
shares of Vast following consummation of the transactions contemplated by the
merger agreement, which may vary depending upon, among other factors, changes in
interest rates, dividend rates, market conditions, general economic conditions
and other factors that generally influence the price of securities. In rendering
its opinion, Goldman Sachs assumed, with the consent of PageNet's board, that
the Financial Restructuring, the spin-off and the other transactions
contemplated by the merger agreement will be completed in the manner set forth
in the merger agreement, including without limitation, that an aggregate of (1)
616.8 million shares of PageNet common stock will be issued pursuant to the
PageNet Exchange Offer (as defined in the merger agreement) and (2) 29.6 million
shares of Arch common stock will be issued pursuant to the Arch Exchange Offer
(as defined in the merger agreement) and that the outstanding preferred stock of
Arch will be converted into 2.1 million shares of Arch common stock.

     Goldman Sachs' opinion related solely to the fairness from a financial
point of view of the exchange ratio to the holders of shares of PageNet common
stock on the date of its opinion. Goldman Sachs did not express any opinion
concerning the consideration to be received by any other security holder of
PageNet pursuant to the Financial Restructuring, the spin-off or any other
transaction contemplated by the merger agreement or the fairness of the
Financial Restructuring to the holders of shares of PageNet common stock on the
date of its opinion.

                                       39
<PAGE>   50

     Goldman Sachs, as part of its investment banking business, is continually
engaged in the valuation of businesses and their securities in connection with
mergers and acquisitions, negotiated underwritings, competitive biddings,
secondary distributions of listed and unlisted securities, private placements
and valuations for estate, corporate and other purposes. Goldman Sachs is
familiar with PageNet, having acted as its financial advisor from time to time,
including having acted as its managing underwriter in May 1992 in an offering of
approximately 6 million shares of PageNet common stock, as its private placement
agent for an aggregate of approximately $1.2 billion principal amount in senior
subordinated notes in three offerings, one each in 1994, 1995 and 1996, and
having acted as its financial advisor in connection with, and having
participated in certain of the negotiations leading to the merger agreement.
Goldman Sachs provides a full range of financial advisory and securities
services and, in the course of its normal trading activities, may from time to
time effect transactions and hold securities, including derivative securities,
of Arch or PageNet for its own account and for the accounts of customers.

     Pursuant to a letter agreement dated November 7, 1999, PageNet and its
wholly owned subsidiaries, PageNet, Inc. and Silverlake Communications, Inc.,
have agreed to pay Goldman Sachs, as compensation for Goldman Sachs' services as
financial advisor to PageNet in connection with the merger, its customary fees.
PageNet, PageNet, Inc. and Silverlake Communications, Inc. have also agreed to
pay Goldman Sachs its reasonable out-of-pocket expenses, including the fees and
disbursements of its attorneys, and to indemnify Goldman Sachs and related
persons against certain liabilities, including certain liabilities arising under
the federal securities laws.

  Opinion of Morgan Stanley Dean Witter

     Pursuant to a letter agreement dated August 1, 1999, Morgan Stanley was
retained by PageNet to act as one of its financial advisors in connection with
the merger and the spin-off. Morgan Stanley is an internationally recognized
investment banking firm and was selected by PageNet based on Morgan Stanley's
qualifications, expertise and reputation, as well as its knowledge of the paging
industry. On November 7, 1999, Morgan Stanley delivered to PageNet's board an
oral opinion, subsequently confirmed in writing, to the effect that, as of
November 7, 1999, and based on and subject to certain matters stated in its
opinion (1) the 0.1247 of a share of Arch common stock (the "exchange ratio")
and (2) the pro rata portion of the 11.6% of the equity interest in Vast
("Distributed Interests", together with the exchange ratio, the "consideration")
to be received by the holders of PageNet common stock on such date pursuant to
the merger and the spin-off, taken as a whole, was fair from a financial point
of view to such holders.

     THE FULL TEXT OF MORGAN STANLEY'S WRITTEN OPINION DATED NOVEMBER 7, 1999,
WHICH SETS FORTH, AMONG OTHER THINGS, THE ASSUMPTIONS MADE, MATTERS CONSIDERED
AND LIMITATIONS ON THE REVIEW UNDERTAKEN, IS ATTACHED AS ANNEX E TO THIS
DOCUMENT. HOLDERS OF PAGENET COMMON STOCK SHOULD READ THIS ENTIRE OPINION
CAREFULLY. MORGAN STANLEY'S OPINION ADDRESSES ONLY THE FAIRNESS OF THE
CONSIDERATION TO BE RECEIVED BY HOLDERS OF PAGENET COMMON STOCK ON SUCH DATE
PURSUANT TO THE MERGER AND THE SPINOFF, TAKEN AS A WHOLE, FROM A FINANCIAL POINT
OF VIEW TO SUCH HOLDERS, AND IT DOES NOT ADDRESS ANY OTHER ASPECTS OF THE
MERGER, THE SPINOFF OR THE FINANCIAL RESTRUCTURING NOR DOES IT CONSTITUTE A
RECOMMENDATION TO ANY STOCKHOLDER AS TO HOW SUCH STOCKHOLDER SHOULD VOTE ON THE
MERGER OR ANY RELATED MATTER. THE SUMMARY OF THE OPINION OF MORGAN STANLEY SET
FORTH IN THIS DOCUMENT IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL
TEXT OF MORGAN STANLEY'S OPINION.

     In arriving at its opinion, Morgan Stanley, among other things:

     - reviewed certain analysis (the "Houlihan Lokey Analysis") prepared by
       Houlihan Lokey of the Financial Restructuring and the Stand Alone
       Restructuring;

     - reviewed certain publicly available financial statements and other
       business and financial information of Arch and PageNet, respectively;

     - reviewed certain internal financial statements and other financial and
       operating data concerning Arch and PageNet, respectively;

                                       40
<PAGE>   51

     - reviewed certain internal financial statements and other financial and
       operating data concerning Vast prepared by the managements of PageNet and
       Vast;

     - analyzed certain financial forecasts prepared by the managements of Arch
       and PageNet, respectively;

     - analyzed certain financial forecasts for Vast prepared by the managements
       of PageNet and Vast;

     - discussed the past and current operations and financial condition and the
       prospects of Arch with senior executives of Arch;

     - discussed the past and current operations and financial condition and the
       prospects of PageNet and Vast with senior executives of PageNet and Vast;

     - discussed with the senior managements of Arch and PageNet their estimates
       of the synergies and cost savings expected to be derived from the merger;

     - reviewed and analyzed the pro forma impact of the merger on the
       consolidated capitalization and financial ratios of the combined company;

     - reviewed the reported prices and trading activity for the Arch common
       stock and the PageNet common stock;

     - compared the financial performance of Arch and PageNet (excluding Vast)
       and the prices and trading activity of the Arch common stock and the
       PageNet common stock and their respective debt securities with that of
       certain other publicly-traded companies and their securities;

     - compared the financial performance of Vast with that of certain other
       companies that are comparable to Vast and have publicly-traded
       securities;

     - reviewed the tax analysis prepared by the management of PageNet with
       respect to the tax treatment of the transactions contemplated by the
       merger agreement;

     - reviewed with PageNet and its other financial advisors, including
       Houlihan Lokey, certain options available to PageNet, other than
       alternative business combinations, for addressing PageNet's liquidity
       needs;

     - reviewed the financial terms, to the extent publicly available, of
       certain acquisition transactions deemed relevant;

     - participated in discussions and negotiations among representatives of
       Arch and PageNet and their financial, restructuring and legal advisors;

     - reviewed the draft merger agreement and certain related documents; and

     - performed such other analyses and considered such other factors as Morgan
       Stanley deemed appropriate.

     In rendering its opinion, Morgan Stanley assumed and relied upon, without
independent verification, the accuracy and completeness of all information
supplied or otherwise made available to it and reviewed by it for the purposes
of its opinion. Morgan Stanley also relied, without independent verification or
evaluation and with the consent of PageNet's board, on the Houlihan Lokey
Analysis for, among other things, purposes of analyzing the impact of the
Stand-Alone Restructuring on the holders of the PageNet common stock on the date
of its opinion. In addition, Morgan Stanley also relied, without independent
verification or evaluation and with the consent of PageNet's board, on the tax
analysis prepared by the management of PageNet with respect to the tax treatment
of the transactions contemplated by the merger agreement. With respect to the
financial forecasts, future prospects, estimates of synergies and cost savings,
Morgan Stanley assumed that they had been reasonably prepared on bases
reflecting the best currently available estimates and judgments of the future
financial performance of Arch, PageNet and Vast. In addition, Morgan Stanley
assumed that the merger will be consummated in accordance with the terms set
forth in the merger agreement, including, among other things, that the merger
will be treated as a tax-free
                                       41
<PAGE>   52

reorganization and/or exchange, each pursuant to Section 368(a) of the Internal
Revenue Code of 1986, as amended. Morgan Stanley did not make any independent
valuation or appraisal of the assets or liabilities of PageNet, Arch or Vast,
nor was it furnished with any such appraisals. Morgan Stanley's opinion is
necessarily based on financial, economic, market and other conditions as in
effect on, and the information made available to it as of, the date of its
opinion.

     Morgan Stanley's opinion is limited to the fairness, from a financial point
of view, of the consideration to be received by the holders of PageNet common
stock on the date of its opinion pursuant to the merger and the spin-off and
Morgan Stanley is not expressing any opinion concerning the consideration to be
received by any other security holder of PageNet pursuant to the Financial
Restructuring, spin-off or any other transaction contemplated by the merger
agreement or the fairness of the Financial Restructuring to the holders of
PageNet common stock on the date of its opinion. In rendering this opinion,
Morgan Stanley assumed, with the consent of PageNet's board, that the Financial
Restructuring and the spinoff will be completed in the manner set forth in the
merger agreement.

     Morgan Stanley also noted that trading in Arch common stock and shares of
Vast for a period of time following completion of the merger and the spin-off
may involve a redistribution of the Arch common stock and the shares of Vast
among the stockholders of the combined entity and other investors and,
accordingly, during such period, Arch common stock and the shares of Vast may
trade at prices below those at which they would trade on a fully distributed
basis after the spin-off. Morgan Stanley's opinion does not in any manner
address the prices at which Arch's common stock or the shares of Vast will trade
following consummation of the merger and the spin-off. In addition, Morgan
Stanley expressed no opinion or recommendation as to how the stockholders of
Arch or PageNet should vote at the stockholders' meetings held in connection
with the merger or any related matter.

     Morgan Stanley is an internationally recognized investment banking advisory
firm. Morgan Stanley, as part of its investment banking business, is regularly
engaged in the valuation of businesses and securities in connection with mergers
and acquisitions, negotiated underwritings, competitive bidding, secondary
distributions of listed and unlisted securities, private placements and
valuation for corporate and other purposes. In the ordinary course of its
business, Morgan Stanley and its affiliates may actively trade the securities of
Arch and PageNet, for Morgan Stanley's account and for the account of customers.

     Pursuant to a letter agreement dated August 1, 1999, PageNet, PageNet, Inc.
and Silverlake Communications, Inc. agreed to pay Morgan Stanley its customary
fees in connection with the merger and spinoff. PageNet, PageNet, Inc. and
Silverlake Communications, Inc. have also agreed to reimburse Morgan Stanley for
its expenses incurred in performing its services. In addition, PageNet, PageNet,
Inc. and Silverlake Communications, Inc. have agreed to reimburse and to
indemnify Morgan Stanley and related persons against any liabilities and
expenses arising out of the engagement and any related transactions, including
liabilities under federal securities laws.

INTERESTS OF CERTAIN PERSONS IN THE MERGER

     In considering the recommendation of PageNet's board of directors with
respect to the merger, stockholders should be aware that some of the members of
PageNet's board of directors and some of PageNet's officers have interests in
the merger that are different from the interests of the stockholders and senior
subordinated noteholders of PageNet and that could potentially represent
conflicts of interest.

     - All outstanding options granted to purchase PageNet common stock,
       including those held by officers and directors of PageNet, will fully
       vest at the effective time of the merger and, if not exercised at that
       time, will be converted into fully vested options to purchase shares of
       Arch common stock, subject to adjustment to reflect the exchange ratio.
       Based upon the options outstanding as of December 1, 1999, options held
       by PageNet's officers and directors relating to 2,154,453 shares of
       PageNet common stock, plus any additional options granted prior to the
       merger, will vest at the effective time of the merger. However, all of
       such options currently have exercise prices which are higher, and in some
       cases significantly higher, than PageNet's current stock price, and, as a
       result of the exchange ratio and the impact of the merger, PageNet's
       officers and directors will hold fewer options to purchase shares at even
       higher exercise prices. As a result
                                       42
<PAGE>   53

       of these circumstances, the options which will vest are likely to have
       minimal value at the time of the merger.

     - Some current officers of PageNet may remain as officers of PageNet or
       become officers of Arch after the merger.

     - Some officers of PageNet will be entitled to severance payments and
       enhanced pension benefits in the event their employment ceases following
       the merger as part of a severance plan established January 20, 1999 which
       is designed to provide benefits to substantially all of PageNet's
       employees upon a "change in control" of PageNet. The severance plan
       provides for severance amounts ranging from 50% to 300% of an employee's
       annual salary and bonus compensation. The amount an employee will receive
       depends upon the employee's position at PageNet. In December 1999,
       PageNet's board of directors made changes in the severance plan to
       increase the number of employees entitled to severance payments at the
       200% level and to increase the severance percentages applicable to John
       P. Frazee, Jr., Mark A. Knickrehm, Edward W. Mullinix, Jr., Lynn A. Bace
       and up to one other officer from 200% to 300% of their annual salary and
       bonus compensation.

     - At the effective time of the merger, John P. Frazee, Jr. will, and other
       current PageNet directors may, be appointed as additional members of
       Arch's board of directors, each to hold office until his successor is
       elected and qualified or until his earlier resignation or removal. Mr.
       Frazee will also be appointed Chairman of the board of directors of the
       combined company. Additional information about Mr. Frazee and the other
       current PageNet directors is contained in "PageNet's Management".

     Each share of PageNet common stock held by PageNet's directors, officers
and their affiliates at the effective time of the merger will, along with all
other PageNet common stock, be converted into 0.1247 shares of Arch common
stock.

     PageNet's board of directors was aware of these interests and considered
them, among other matters, when adopting the merger.

  Indemnification and Insurance

     The merger agreement provides that, for six years after the effective time
of the merger, Arch will cause PageNet to indemnify and hold harmless each
present and former PageNet director and officer (solely when acting in such
capacity) determined as of the effective time of the merger, against any costs
or expenses, including reasonable attorney's fees, judgments, fines, losses,
claims, damages or liabilities incurred in connection with any claim, action,
suit, proceeding or investigation, whether civil, criminal, administrative or
investigative, arising out of or pertaining to matters existing or occurring at
or before the effective time of the merger, whether asserted or claimed before,
at or after the effective time of the merger, to the fullest extent that PageNet
would have been permitted under Delaware corporate law and its certificate of
incorporation or bylaws in effect on November 7, 1999, to indemnify those
persons. PageNet after the merger will also advance expenses as incurred to the
fullest extent permitted under applicable law, provided the person to whom
expenses are advanced provides an undertaking to repay any advances if it is
ultimately determined that he or she is not entitled to indemnification.

     The merger agreement also provides that, for a period of six years after
the effective time of the merger, Arch will maintain a policy of officers' and
directors' liability insurance for acts and omissions occurring before the
effective time of the merger with coverage in amount and scope at least as
favorable as PageNet's directors' and officers' liability insurance coverage on
November 7, 1999. If PageNet's insurance policy in effect on November 7, 1999,
expires, is terminated or is canceled, or if the annual premium is increased to
an amount in excess of 200% of the last annual premium paid before November 7,
1999, in each case during the six-year period, Arch will use its best efforts to
obtain insurance in an amount and scope as great as can be obtained for the
remainder of the period for a premium not in excess, on an annualized basis, of
200% of the current premium. In the alternative, PageNet can obtain prepaid
policies that provide such directors and officers with coverage for an aggregate
period of six years with respect to claims arising from facts or events that
occurred on or before the
                                       43
<PAGE>   54

effective time of the merger, including, without limitation, in respect of the
transactions contemplated by the merger agreement. In the event PageNet obtains
such prepaid policies, Arch has agreed to maintain policies in full force and
effect and continue to honor PageNet's obligations.

     In addition to the provisions of the two previous paragraphs, each director
and many officers of PageNet are entitled to indemnification and insurance in
accordance with the indemnity agreement between such officer or director and
PageNet.

TREATMENT OF PAGENET'S COMMON STOCK

     In the merger, each issued and outstanding share of PageNet common stock
will be converted into 0.1247 shares of Arch common stock. However, shares held
by Arch or any wholly owned subsidiary of Arch will be canceled without
conversion. The exchange ratio will be adjusted to eliminate the effect of any
stock split, stock dividend, stock distribution (other than the Vast spin-off
distribution) or other similar transaction by either Arch or PageNet that occurs
before the merger.

     HOLDERS OF PAGENET COMMON STOCK SHOULD NOT SEND ANY CERTIFICATES
REPRESENTING PAGENET COMMON STOCK. FOLLOWING THE EFFECTIVE TIME OF THE MERGER,
HOLDERS OF PAGENET COMMON STOCK WILL RECEIVE INSTRUCTIONS FOR THE SURRENDER AND
EXCHANGE OF SUCH STOCK CERTIFICATES.

THE EXCHANGE OFFERS

  Arch

     Concurrently with the solicitation of proxies for approval of the merger,
Arch will conduct an exchange offer for all of its outstanding 10 7/8% discount
notes. In the exchange offer, Arch will issue 66.1318 shares of common stock in
exchange for each $1,000 principal amount at maturity of 10 7/8% discount notes
surrendered pursuant to its exchange offer, together with all accreted interest
on such notes. As of the date of this joint proxy statement/prospectus, $448.4
million in aggregate principal amount at maturity of discount notes are
outstanding.

     Arch's obligation to consummate the exchange offer is contingent on the
valid tender of at least 97.5% of the outstanding aggregate principal amount of
the discount notes in accordance with the terms of the exchange offer. These
tenders must be valid and not withdrawn prior to the expiration date of the
exchange offer. PageNet may waive the 97.5% tender requirement and lower it to
any level at its sole discretion and, at any time after PageNet has met the
requirements with respect to its exchange offer, Arch may elect to lower the
97.5% tender requirement to an amount not less than 67%.

     Holders of the discount notes who tender in connection with the exchange
offer will be required to give their consent to:

     - amend the indenture for the notes, if necessary, to permit completion of
       the merger;

     - amend the indenture to eliminate:

        - any covenants which may be modified or eliminated by a majority vote
          of the discount notes;

        - any events of default which relate to (1) the non-payment or
          acceleration of other indebtedness, (2) the failure to discharge
          judgments for the payment of money or (3) the bankruptcy or insolvency
          of any subsidiaries; and

        - any provisions which condition mergers or consolidations on compliance
          with any financial criteria.

In addition, each holder of discount notes will be required to waive any and all
existing defaults with respect to the discount notes and any and all rights to
rescind their acceptance of the exchange offer after the expiration date.

                                       44
<PAGE>   55

     The expiration date will be 12:00 midnight, New York City time, on the
          business day after the commencement of the exchange offer, or at a
later date which is mutually agreed upon by Arch and PageNet.

  PageNet

     Concurrently with the solicitation of proxies for approval of the merger,
PageNet will conduct an exchange offer for all of its outstanding 8.875%,
10.125% and 10% senior subordinated notes. In the exchange offer, PageNet will
issue a pro rata portion of 616,830,757 shares of PageNet common stock (which
will then be immediately convertible into Arch common stock at an exchange ratio
of 0.1247 shares of Arch common stock for each share of PageNet common stock)
and a pro rata portion of 13,780,000 shares of Class B common stock of Vast,
representing up to 68.9% of the equity ownership of Vast (subject to the
possibility of dilution), in exchange for each of PageNet's outstanding senior
subordinated notes surrendered pursuant to its exchange offer.

     As of the date of this joint proxy statement/prospectus, $1.2 billion in
aggregate principal amount of senior subordinated notes are outstanding.

     PageNet's obligation to consummate the exchange offer is contingent on the
valid tender of at least 97.5% of the outstanding aggregate principal amount of
the senior subordinated notes and at least a majority of the outstanding
principal amount of each series of PageNet senior subordinated notes in
accordance with the terms of its exchange offer. These tenders must be valid and
not withdrawn prior to the expiration date of the exchange offer.

     To validly tender senior subordinated notes, holders must also consent to
the prepackaged plan of reorganization and to:

     - amend the indentures, if necessary, to permit completion of the merger or
       the prepackaged plan;

     - amend the indentures to eliminate:

        - any covenants which may be modified or eliminated by a majority vote
          of the senior subordinated notes;

        - any events of default which relate to (1) the non-payment or
          acceleration of other indebtedness, (2) the failure to discharge
          judgments for the payment of money or (3) the bankruptcy or insolvency
          of any subsidiaries; and

        - any provisions which condition mergers or consolidations on compliance
          with any financial criteria.

     In addition, each holder will be required to waive any and all existing
defaults with respect to the senior subordinated notes and any and all rights to
rescind their acceptance of the exchange offer after the expiration date.

     The expiration date will be 12:00 midnight, New York City time, on the
       business day after the commencement of the exchange offer, or at a later
date which is mutually agreed upon by PageNet and Arch.

REGULATORY APPROVALS

     To complete the merger, Arch and PageNet must make filings and receive
authorizations from various federal and state governmental agencies in the
United States. These filings relate to antitrust matters, transfers of control
of FCC licenses and other regulations. It is possible that some of these
governmental authorities may impose conditions for granting approval. We cannot
predict whether all the required regulatory approvals will be obtained within
the timeframe contemplated by the merger agreement or without burdensome
conditions. On December 13, 1999, Arch and PageNet filed a Request for Approval
of a Transfer of Control of the FCC licenses held by each of Arch's and
PageNet's subsidiaries. This request remains pending.
                                       45
<PAGE>   56

     Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, Arch and
PageNet may not merge until notifications have been furnished to the Federal
Trade Commission and the Antitrust Division of the Department of Justice and
specified waiting period requirements have been satisfied. PageNet and Arch each
filed a pre-merger notification and report form with the FTC and Antitrust
Division on November 24, 1999. On December 23, Arch and PageNet each received a
request for additional information and documents from the Antitrust Division.
These requests extend the waiting period during which the proposed merger may
not be consummated until twenty days after the date that PageNet and Arch
substantially comply with those requests. Arch and PageNet are proceeding to
compile the information and documents requested by the Antitrust Division and
intend to submit such information and documents as soon as reasonably
practicable.

     At any time before the effective time of the merger, the Antitrust
Division, the FTC, state attorneys general or a private person or entity could
seek under antitrust laws, among other things, to enjoin the merger and, any
time after the effective time of the merger, to cause Arch to divest itself, in
whole or in part, of the stock of the surviving corporation in the merger or of
certain businesses conducted by the surviving corporation in the merger. There
can be no assurance that a challenge to the merger will not be made or that, if
such a challenge is made, Arch will prevail. The obligations of Arch and PageNet
to complete the merger are subject to the condition that any applicable waiting
period under the Hart-Scott-Rodino Act shall have expired without any action by
the Antitrust Division or the FTC to prevent consummation of the merger. See
"The Merger Agreement -- Conditions to Completion of the Merger".

MATERIAL FEDERAL INCOME TAX CONSIDERATIONS

     The merger has been structured to qualify as a tax free reorganization
under the Internal Revenue Code. Arch, PageNet and their stockholders should not
recognize gain or loss in connection with the merger, except that the related
distribution and receipt of Class B common stock of Vast is expected to be
taxable to PageNet and its stockholders. See "Material Federal Income Tax
Considerations".

ACCOUNTING TREATMENT OF THE MERGER

     Arch will account for the merger using the purchase method of accounting
for a business combination, in accordance with Accounting Principles Board
Opinion No. 16. The assets and liabilities of PageNet, including intangible
assets, will be recorded at their fair market values and included in the
financial statements of Arch. The results of operations and cash flows of
PageNet will be included in Arch's financial statements from the date of merger.

QUOTATION ON NASDAQ NATIONAL MARKET SYSTEM

     It is a condition to the closing of the merger that the shares of Arch
common stock to be issued in the merger be listed on the Nasdaq National Market
System.

RESALES OF ARCH COMMON STOCK ISSUED IN CONNECTION WITH THE MERGER; AFFILIATE
AGREEMENTS

     Arch common stock issued in connection with the merger will be freely
transferable, except that shares of Arch common stock received by persons who
are deemed to be "affiliates", as such term is defined by Rule 144 under the
Securities Act, of PageNet at the effective time of the merger may be resold by
them only in transactions permitted by the resale provisions of Rule 145 under
the Securities Act or as otherwise permitted under the Securities Act. Each
executive officer and director of PageNet has executed a written affiliate
agreement providing, among other things, that such person will not offer, sell,
transfer or otherwise dispose of any of the shares of Arch common stock obtained
as a result of the merger except in compliance with the Securities Act and
related rules and regulations.

                                       46
<PAGE>   57

NO APPRAISAL RIGHTS

     Appraisal rights under Delaware law are not available to stockholders of a
Delaware corporation if:

     - their stock is listed on a national securities exchange or designated as
       a national market system security on an interdealer quotation system by
       the National Association of Securities Dealers, Inc.; and

     - the stockholders are not required to accept in exchange for their stock
       anything other than (1) stock in another corporation listed on a national
       securities exchange or designated as a national market system security on
       an interdealer quotation system by the NASD and (2) cash in lieu of
       fractional shares.

     PageNet stockholders will not have appraisal rights under Delaware law with
respect to the merger because:

     - PageNet's common stock is traded on the Nasdaq National Market System;

     - PageNet's stockholders are being offered shares of Arch common stock,
       which is traded on the Nasdaq National Market; and

     - PageNet's stockholders are being offered cash in lieu of fractional
       shares.

     However, if PageNet's stock is delisted from the Nasdaq National Market
System, stockholders may have appraisal rights. PageNet has been notified of a
potential delisting of its common stock from the Nasdaq National Market System.
See "Risk Factors -- PageNet may be delisted from the Nasdaq National Market
System and the Chicago Stock Exchange prior to the completion of the merger,
resulting in reduced trading liquidity for the shares of its common stock".

PAGENET BANKRUPTCY CASES

     If PageNet's board of directors determines to effect the merger through use
of the chapter 11 process, Paging Network, Inc. and certain of its operating
subsidiaries will commence the chapter 11 cases and also file and seek to
confirm and consummate the Plan. The merger, if effected pursuant to the Plan,
will be implemented differently from the way it would be effected outside of the
chapter 11 cases.

     The Plan provides for the conversion of the claims held by holders of
PageNet senior subordinated notes directly into Arch common stock upon
consummation of the merger. If the merger is completed outside of a chapter 11
case, the merger will be completed in a two step process. The claims of the
holders of senior subordinated notes will first be converted into PageNet common
stock and then such common stock will be converted to Arch common stock pursuant
to the merger agreement. In connection with the conversion of the PageNet senior
subordinated notes to PageNet common stock, holders of such notes will also
receive shares of Class B common stock of Vast.

     If the merger is consummated pursuant to the Plan as confirmed in the
chapter 11 cases, all holders of senior subordinated note claims and PageNet
equity interests will be bound by the Plan and merger agreement regardless of
whether they voted in favor of the Plan. If the merger is consummated pursuant
to the merger agreement outside of bankruptcy, the terms of the merger that
relate to PageNet stockholders will be binding only on those holders of
PageNet's senior subordinated notes that exchange their notes pursuant to the
terms of the exchange offer. Also, if the merger is consummated outside of
bankruptcy, the holders of PageNet's senior subordinated notes that do not
exchange their notes pursuant to the terms of the exchange offer will retain
their notes but the terms of the indentures governing their senior subordinated
notes will be modified pursuant to the terms of the exchange offer.

     If in the chapter 11 cases the holders of the senior subordinated notes do
not vote, as a class, to accept the Plan, PageNet will have the option to seek
to confirm the Plan through a "cramdown" which will impose the terms of the
exchange offer and merger on the noteholders notwithstanding their dissent. This
option is not available to Arch and PageNet outside of a chapter 11 case.

                                       47
<PAGE>   58

                              THE MERGER AGREEMENT

     The following is a brief summary of the material provisions of the merger
agreement, as amended, a copy of which is attached as Annex A to this joint
proxy statement/prospectus and is incorporated by reference into this summary.
This summary description is not complete and is qualified in its entirety by
reference to the merger agreement. We urge you to read the merger agreement in
its entirety for a more complete description of the terms and conditions of the
merger and related matters.

STRUCTURE OF THE MERGER

     Following the completion of the Arch and PageNet exchange offers and Arch
preferred stock conversion and the satisfaction or waiver of all other
conditions to the merger, a wholly owned subsidiary of Arch will merge into
PageNet, and PageNet will thus become a wholly owned subsidiary of Arch. Two
business days after all conditions to the merger are fulfilled or waived, or at
such other time and date as Arch and PageNet agree, we will close the merger and
Arch will file a certificate of merger with the Delaware Secretary of State. The
phrase "effective time of the merger" refers to the time of that filing, or any
other time that we agree upon and specify in the certificate of merger.

     Immediately prior to the effective time of the merger, PageNet will
distribute 68.9% of the common stock of Vast to its noteholders who exchange
their notes for PageNet common stock. PageNet will also distribute 11.6% of the
common stock of Vast to PageNet stockholders as a dividend. After the merger,
Arch will retain 19.5% of the common stock of Vast. These percentages will be
diluted proportionately if Vast issues additional equity before or after the
merger. See "The Spin-off Distribution".

THE EXCHANGE RATIO AND TREATMENT OF PAGENET COMMON STOCK

     At the effective time of the merger each outstanding share of PageNet
common stock will be converted into 0.1247 shares of Arch common stock. Shares
of PageNet common stock owned by Arch or any direct or indirect wholly owned
subsidiary of Arch will be canceled and PageNet will become a wholly owned
subsidiary of Arch. If, before the effective time of the merger, the issued and
outstanding shares of Arch common stock are changed into a different number of
shares as a result of a reclassification, stock split, reverse stock split,
stock dividend or stock distribution, an appropriate adjustment will be made to
the number and kind of shares of Arch common stock that PageNet stockholders are
to receive in the merger.

     For a description of Arch's common stock and a description of the
differences between the rights of holders of Arch common stock and PageNet
common stock, see "Comparison of Rights of PageNet Stockholders and Arch
Stockholders".

     No fractional shares of Arch common stock will be issued in the merger.
Instead, Arch will pay cash to each holder of PageNet common stock who would
otherwise be entitled to receive a fraction of a share of Arch common stock, in
an amount equal to the fraction, rounded to the nearest one-hundredth of a
share, multiplied by the average closing price per share of Arch common stock as
reported in The Wall Street Journal, New York City edition, during the ten
trading days immediately before the effective time of the merger. No interest
will be paid or accrued on cash to be paid instead of fractional shares.

EXCHANGE PROCEDURES

     At the effective time of the merger, Arch will deposit with [the exchange
agent], for distribution to the holders of PageNet common stock, certificates
representing shares of Arch common stock issuable under the merger agreement and
an amount of cash sufficient to pay cash instead of fractional shares. Arch will
make sufficient funds available to the exchange agent from time to time as
needed to pay cash in respect of dividends or other distributions on unexchanged
shares.

                                       48
<PAGE>   59

     If a PageNet stockholder has a PageNet stock certificate, then promptly
after the merger takes place, the exchange agent will send the stockholder a
letter of transmittal and instructions for exchanging its PageNet common stock
certificates for:

     - a certificate representing shares of Arch common stock;

     - certificates representing shares of Class B common stock of Vast; and

     - cash instead of any fractional shares of Arch common stock.

The surrendered PageNet common stock certificates will be canceled. YOU SHOULD
NOT SEND IN ANY PAGENET COMMON STOCK CERTIFICATES UNTIL YOU RECEIVE THE LETTER
OF TRANSMITTAL.

     If a PageNet stockholder owns PageNet common stock through a broker,
PageNet's employee benefit plans or other arrangement where the stockholder does
not hold a PageNet certificate, then the stockholder's stock will be exchanged
for Arch common stock and cash in lieu of fractional shares based on the
exchange ratio without any action by the stockholder.

     PageNet noteholders who participate in the exchange offer will receive
certificates for their shares of Arch common stock after the merger instead of
receiving certificates for the shares of PageNet common stock they are entitled
to receive in the exchange offer.

     If any certificates for shares of Arch common stock are to be issued in a
name other than that in which the PageNet stock certificate surrendered in
exchange for them is registered, the person requesting such exchange must (1)
pay any associated transfer taxes or other taxes or (2) establish to the
satisfaction of Arch or the exchange agent that all taxes have been paid or are
not applicable.

     The exchange agent will deduct and withhold from the consideration
otherwise payable under the merger agreement whatever amounts the exchange agent
is required to deduct and withhold under the Internal Revenue Code, or any
provision of state, local or foreign tax law, with respect to the making of such
payment. To the extent that amounts are withheld by the exchange agent, the
withheld amounts shall be treated for purposes of the merger agreement as having
been paid to the person for whom the deduction and withholding was made by the
exchange agent.

     Registered holders of unsurrendered PageNet common stock certificates will
be entitled to vote at any meeting of Arch stockholders with a record date at or
after the effective time of the merger the number of whole shares of Arch common
stock represented by their PageNet common stock certificates, regardless of
whether such holders have exchanged their PageNet common stock. The time,
conditions and manner of the vote will be governed by Arch's certificate of
incorporation and bylaws.

     After the effective time of the merger, the PageNet stock transfer books
will not reflect transfers of shares of PageNet common stock. The Arch stock
transfer books will not reflect transfers of shares of Arch Series C convertible
preferred shares.

     If a certificate for PageNet common stock has been lost, stolen or
destroyed, the PageNet stockholder must provide an appropriate affidavit of
fact. Arch will also require the PageNet stockholder to deliver a bond as
indemnity against any claim that may be made against Arch with respect to such
certificates alleged to have been lost, stolen or destroyed. Arch and the
exchange agent will then issue the consideration properly payable in accordance
with the merger agreement.

TREATMENT OF PAGENET STOCK OPTIONS

     At the effective time of the merger, each unvested option to purchase
PageNet common stock previously granted under PageNet's stock plans will
automatically vest. We will then convert each outstanding PageNet option into an
option to purchase the same number of shares of Arch common stock that the
holder of the option would have received in the merger if the holder had
exercised the option immediately prior to the merger. The number of shares of
Arch common stock calculated in the conversion will be rounded down to the
nearest whole number. The exercise price per share of Arch common stock subject
to each option will equal the aggregate exercise price of the PageNet common
stock
                                       49
<PAGE>   60

which would have been purchasable under the PageNet option, divided by the
number of shares of Arch common stock the holder of the option would have
received in the merger if the holder had exercised the option immediately prior
to the merger, rounded down to the nearest whole number.

REPRESENTATIONS AND WARRANTIES

     The merger agreement contains representations and warranties of PageNet,
Arch and Arch's subsidiary. These representations and warranties relate to,
among other things:

     - their organization, existence, good standing, corporate power,
       qualification to do business and similar corporate matters;

     - their capital structure;

     - the authorization, execution, delivery and performance of the merger
       agreement;

     - the absence of any required governmental and third-party approvals other
       than those specified in the merger agreement;

     - the absence of breaches, violations or defaults under their corporate
       charters and bylaws and other agreements and documents;

     - the accuracy of their financial statements and any filings with the
       Securities and Exchange Commission;

     - the absence of certain changes in their businesses since the end of the
       prior fiscal year;

     - the absence of litigation and liabilities, including liabilities
       associated with employee benefit plans;

     - their compliance with applicable laws, including environmental and
       regulatory laws;

     - the absence of actions that would prevent the merger from being treated
       as a tax-free reorganization under the Internal Revenue Code;

     - the timely filing of all tax returns and payment of all taxes;

     - the absence of undisclosed brokers and finders;

     - the status of their preparedness with respect to Year 2000 compliance;

     - the approval by each board of directors of the merger agreement and the
       merger;

     - the receipt by each board of directors of the opinions of their
       respective financial advisors that the consideration for the merger is
       fair to holders of PageNet common stock and Arch common stock from a
       financial point of view;

     - their employee benefits plans;

     - the actions taken by each board of directors to make Delaware's
       interested stockholder business combination law, other state takeover
       statutes, each of their rights agreements and any other anti-takeover
       provision in their certificates of incorporation or bylaws inapplicable
       to the merger;

     - their relationships with employees;

     - environmental matters and compliance with environmental laws;

     - their significant agreements; and

     - their intellectual property.

                                       50
<PAGE>   61

COVENANTS

  Conduct of Businesses Prior to the Merger

     Except as contemplated by the merger agreement, Arch and PageNet have
agreed that they and their subsidiaries will conduct their businesses only in
the ordinary and usual course until the effective time of the merger. The merger
agreement includes other limitations, prohibitions and provisions relating to
the conduct of their businesses before the effective time of the merger
concerning:

     - charter and by-law amendments;

     - changes in capital stock and payment of dividends;

     - actions that would prevent the merger from qualifying as a tax-free
       reorganization under the Internal Revenue Code;

     - increases in compensation, and amendments to employee benefit or
       retirement plans;

     - incurrence or repayment of indebtedness;

     - capital expenditure levels;

     - issuance of capital stock and convertible securities;

     - acquisitions and dispositions;

     - changes in accounting policies or procedures;

     - settlement or release of claims in litigation; and

     - tax elections.

     Some of these limitations do not apply, however, with respect to Vast.
PageNet may, among other things:

     - transfer or encumber shares of capital stock or securities convertible
       into shares of capital stock of Vast;

     - cause Vast to incur debt, so long as the borrowed funds are used solely
       by Vast;

     - transfer certain specified assets to Vast;

     - establish the terms of the equity interest in Vast to be transferred to
       the holders of PageNet common stock and PageNet notes; and

     - establish an employee equity incentive plan for Vast.

  Non-Solicitation of Competing Proposals

     Arch and PageNet have agreed to restrictions concerning an "acquisition
proposal," which the merger agreement defines generally as a proposal of merger,
business combination or acquisition of more than 10% of their assets or 15% of
their stock. Specifically, each company has agreed that neither it nor its
agents will, directly or indirectly:

     - initiate, solicit, encourage or otherwise facilitate any inquiries or the
       making of any acquisition proposal with a third party;

     - have any discussions with or provide any confidential information or data
       to a third party in connection with an acquisition proposal; or

     - engage in any negotiations concerning an acquisition proposal or
       otherwise facilitate any acquisition proposal.

                                       51
<PAGE>   62

     The merger agreement expressly allows Arch and PageNet to comply with SEC
rules regarding the publication of a board of directors' recommendations with
respect to tender offers, and, subject to some limitations, expressly allows the
board of directors of Arch or PageNet to:

     - negotiate with, and provide information to, a third party in response to
       an unsolicited bona fide written acquisition proposal, if the board of
       directors concludes in good faith, after consulting outside counsel, that
       doing so is necessary to comply with the board's fiduciary duty to its
       stockholders; and

     - recommend an unsolicited proposal to its stockholders, if the board of
       directors concludes in good faith, after consulting its legal and
       financial advisors, that such transaction is reasonably capable of being
       completed, and, if completed, would be more favorable to its stockholders
       than the proposed transaction between Arch and PageNet.

     Arch and PageNet have agreed to terminate all existing discussions and
negotiations with third parties concerning acquisition proposals. Each company
has agreed to notify the other as soon as reasonably practicable if it receives
any acquisition proposal, or if a third party seeks information from it or seeks
to engage it in discussions concerning an acquisition proposal. Each company has
also agreed to keep the other company informed of any such proposals or
inquiries on an ongoing basis.

  Stockholders Meetings

     The merger agreement requires both companies to convene stockholder
meetings as soon as reasonably practicable after the registration statement
containing this joint proxy statement/prospectus is declared effective.

     PageNet has agreed that its board of directors will recommend that PageNet
stockholders vote to:

     - adopt the merger agreement;

     - approve the merger;

     - approve an amendment to the PageNet certificate of incorporation to
       increase the authorized number of shares of PageNet common stock to an
       amount sufficient to complete the PageNet exchange offer and approve the
       issuance of such common stock; and

     - approve the other associated transactions.

     The PageNet board of directors may withdraw or modify its recommendation if
it determines in good faith, after consultation with outside legal counsel, that
failing to do so would be reasonably likely to be inconsistent with its
fiduciary duties.

     Even if the PageNet board of directors withdraws or modifies its
recommendation, it must convene and complete the stockholder meeting which
considers the merger. The PageNet board of directors is not required to convene
the stockholders meeting, however, if PageNet is in bankruptcy or if Arch
terminates the merger agreement.

     Arch has agreed that its board of directors will recommend that Arch
stockholders vote to:

     - increase the authorized number of shares of Arch common stock to an
       amount sufficient to complete the merger, the conversion of the Arch
       Series C preferred stock and the Arch exchange offer and approve the
       issuance of such common stock; and

     - approve an amendment to permit the conversion of each share of Arch
       Series C preferred stock into shares of Arch common stock.

     The Arch board of directors may withdraw or modify its recommendation if it
determines in good faith, after consultation with outside legal counsel, that
failing to do so would be reasonably likely to be inconsistent with its
fiduciary duties.

                                       52
<PAGE>   63

     Even if the Arch board of directors withdraws or modifies its
recommendation, it must convene and complete the stockholder meeting which
considers the transaction. The board of directors is not required to convene the
stockholders meeting, however, if PageNet terminates the merger agreement.

  Filings and Other Actions

     Arch and PageNet have agreed to cooperate with each other, and to use their
reasonable best efforts

     - to deliver comfort letters from their respective independent public
       accountants;

     - to take all necessary, proper and advisable actions to complete the
       merger, including obtaining opinions from their respective attorneys,
       preparing and filing promptly all documentation necessary to complete the
       merger, and instituting any court action necessary to obtain approval of
       the merger and defending any court action instituted to prevent
       completion of the merger;

     - to obtain promptly all approvals necessary or advisable to complete the
       merger; and

     - to share all information reasonably necessary and advisable in connection
       with the merger.

  Affiliates

     All Arch common stock received by PageNet stockholders in the merger will
be freely transferable, except persons who are deemed to be "affiliates" of
PageNet, as defined under the Securities Act, who must resell their Arch common
stock only in transactions permitted by the resale provisions of Rule 145 under
the Securities Act, or Rule 144 in the case of such persons who become
affiliates of Arch, or as otherwise permitted under the Securities Act. Persons
who may be deemed to be affiliates of Arch or PageNet generally include
individuals or entities that control, are controlled by or are under common
control with such company and may include officers and directors of Arch or
PageNet, as well as significant stockholders.

     Under the merger agreement, PageNet is required to use all reasonable
efforts to cause each of its affiliates to execute a written agreement
restricting the disposition by the affiliate of the shares of Arch common stock
to be received in the merger.

  Indemnification; Director and Officer's Insurance

     For a period of six years after the effective time of the merger, Arch has
agreed to indemnify each present and former director and officer of PageNet
against any costs or expenses incurred in connection with any proceeding or
investigation pertaining to matters occurring at or before the effective time of
the merger relating to the services the indemnified party performed for PageNet.
Arch will have the right to assume the defense of any claims. If it elects to
assume the defense, it will only be liable for the legal expenses of its counsel
and not those of any other counsel.

     Arch will also, for a period of six years after the effective time of the
merger, maintain a policy of officers' and directors' liability insurance for
acts and omissions occurring prior to the effective time of the merger, with
coverage in amount and scope at least as favorable to the indemnified parties as
PageNet's existing coverage.

  Bankruptcy Provisions

     If less than 97.5% of the PageNet notes are tendered in the PageNet
exchange offer or if the stockholders of PageNet fail to approve the merger
agreement, Paging Network, Inc. has agreed to either commence the chapter 11
cases and file the prepackaged plan as a plan of reorganization under chapter 11

                                       53
<PAGE>   64

of the Bankruptcy Code or pay Arch a $40.0 million termination fee if the
following conditions to the filing of the prepackaged plan are met:

     - Arch stockholders have approved the transaction;

     - 97.5% of the Arch notes have been tendered for exchange in the Arch
       exchange offer, or 67% have been tendered in specified circumstances;

     - the holders of less than 97.5% but at least 66 2/3% in principal amount
       of the PageNet notes that constitute at least a majority in number of all
       such holders have consented to the prepackaged plan;

     - sufficient debt financing has been arranged to fund PageNet's operations
       until the prepackaged plan is approved by the bankruptcy court; and

     - senior credit facilities of at least $1.3 billion have been secured or
       can be secured through the prepackaged plan.

     If PageNet files the prepackaged plan, then Arch has agreed to be bound by
all of the terms of the merger agreement provided that the prepackaged plan is
confirmed by the bankruptcy court within 120 days of the filing of the plan or
such later date as is mutually agreed to in writing by Arch and PageNet. In the
event the chapter 11 cases are commenced and the prepackaged plan is filed, Arch
has agreed to take certain actions to support confirmation of the prepackaged
plan.

     At any time, if the board of directors of PageNet determines that the
commencement of the chapter 11 cases and the filing of the prepackaged plan is
in the best interests of PageNet then:

     - PageNet may commence the chapter 11 cases and file the prepackaged plan
       under chapter 11 of the Bankruptcy Code and shall seek to satisfy its
       part of the prepackaged plan conditions and otherwise seek confirmation
       of the prepackaged plan by the bankruptcy court, and

     - Arch shall:

        - seek to satisfy its conditions to PageNet's filing of the prepackaged
          plan outlined above; and

        - be bound by the terms of the merger agreement and consummate the
          merger through the prepackaged plan if such plan is confirmed by the
          bankruptcy court, provided that such confirmation is entered by no
          later than December 31, 2000, or such later date as is mutually agreed
          to by Arch and PageNet, and if the other conditions to the merger have
          been satisfied.

     If an involuntary bankruptcy petition is filed against PageNet or any of
its subsidiaries or a liquidator or trustee is appointed for any of them prior
to a voluntary commencement of PageNet's bankruptcy case and the date of such
involuntary action is prior to the date which is 60 days after the date that the
registration statements relating to the merger and the exchange offers are
declared effective by the SEC, PageNet shall have up to 120 days after such
involuntary action to obtain from the appropriate court an order which dismisses
such action, so that the exchange offers may be completed, and during such
120-day period the merger agreement shall remain in full force and effect and
Arch shall be bound by all of the terms thereof; or

     - if such involuntary action is filed more than 60 days after the date that
       the registration statements relating to the merger and the exchange
       offers are declared effective by the SEC, and as of such date of such
       involuntary action:

        - at least 97.5% of the aggregate outstanding principal amount of the
          PageNet notes and not less than a majority in number of each series of
          PageNet notes have been validly tendered and not withdrawn;

        - 97.5% of the Arch notes have been tendered for exchange in the Arch
          exchange offer, or 67% have been tendered in specified circumstances;
          and

        - the Arch and PageNet stockholders have approved the transaction;

                                       54
<PAGE>   65

     then PageNet shall have up to 120 days after such involuntary action to
     obtain an order which dismisses such action, and the merger agreement shall
     remain in full force and effect and Arch shall consummate the merger
     (outside of bankruptcy, unless Arch and PageNet mutually consent to file
     PageNet's bankruptcy case) provided that such order has been obtained
     before the expiration of such 120-day period.

     If on such date of such involuntary action:

        - less than 97.5% of the aggregate outstanding principal amount of the
          PageNet notes or less than a majority in number of each series of
          PageNet notes have been validly tendered and not withdrawn, or the
          PageNet stockholders fail to approve the transaction; but

        - the conditions to the prepackaged plan have been satisfied,

     then PageNet shall stipulate to bankruptcy relief under chapter 11 of the
     Bankruptcy Code and Arch will be bound by all of the terms of the merger
     agreement provided that the prepackaged plan is confirmed by the bankruptcy
     court within 120 days of the filing of the plan or such later date as may
     be agreed by Arch and PageNet;

     If on such date of such involuntary action:

        - less than 97.5% of the aggregate outstanding principal amount of the
          PageNet notes or less than a majority in number of each series of
          PageNet notes have been validly tendered and not withdrawn, or the
          PageNet stockholders fail to approve the transaction; and

        - the conditions to the prepackaged plan have not been satisfied,

     then PageNet may (but shall not be obligated to) stipulate to bankruptcy
     relief under chapter 11 of the Bankruptcy Code and the provisions described
     above relating to a voluntary filing by PageNet shall apply (including the
     provisions therein requiring Arch to be obligated for a period of time to
     consummate the merger pursuant to the prepackaged plan).

     If PageNet's bankruptcy case is commenced (voluntarily or involuntarily),
PageNet has agreed to file a motion on the date such case commences seeking
expedited approval of certain sections of the merger agreement concerning
nonsolicitation of competing proposals and the payment by Arch and PageNet of
their respective termination fees. The merger agreement provides that Arch may
terminate the agreement if an order approving such motion is not entered within
30 days after the commencement of the bankruptcy case.

     If PageNet's bankruptcy case commences, Arch may enter into another merger
or acquisition transaction, provided that such transaction would not prevent,
materially impair or materially delay its ability to consummate the merger. If
Arch enters into a merger or acquisition transaction following the commencement
of PageNet's bankruptcy case and as a result of such event PageNet is required
to amend its disclosure statement and resolicit the votes of its creditors, then
the time within which the order of the bankruptcy court confirming the
prepackaged plan must be obtained shall be extended for an additional 90 days.

CONDITIONS TO COMPLETION OF THE MERGER

     We will complete the merger only if the conditions set forth in the merger
agreement are satisfied or waived. The conditions to each of Arch's and
PageNet's obligation to complete the merger include:

     - stockholder approval of the transaction by Arch's stockholders;

     - either:

        - stockholder approval of the transaction by PageNet's stockholders; or

        - entry of a confirmation order, not subject to a stay or injunction, by
          the bankruptcy court confirming the prepackaged plan;

                                       55
<PAGE>   66

     - the approval for listing on the Nasdaq National Market System of the Arch
       common stock to be issued in connection with the merger and the other
       transactions contemplated by the merger agreement;

     - the receipt of specified governmental consents, permits, licenses and
       approvals for the merger and the expiration or termination of all
       applicable waiting periods, and any extensions of these permits, under
       the Hart-Scott-Rodino Act;

     - the effectiveness of the registration statements related to the merger
       and the exchange offers and the absence of any stop order suspending the
       effectiveness of the registration statements with the SEC or any
       instituted or threatened proceeding seeking a stop order;

     - the availability of senior credit facilities in a minimum amount of $1.3
       billion to Arch and its subsidiaries, including PageNet, after the
       merger;

     - Arch's receipt of all required state securities and "blue sky" permits
       and approvals;

     - that neither PageNet, Arch nor any of their subsidiaries incurring
       out-of-pocket income tax liability in their respective taxable periods of
       more than $25.0 million in the aggregate as a result of the merger and
       the other transactions contemplated by the merger agreement; and

     - either:

        - the minimum required amount of Arch and PageNet notes has been
          tendered and accepted in each of the exchange offers; or

        - if the minimum required amount of PageNet notes has not been tendered
          and accepted:

           - the final confirmation order from the bankruptcy court confirming
             the prepackaged plan has been entered;

           - the Arch minimum condition has been satisfied; and

           - all conditions under the prepackaged plan have been satisfied.

     With respect to the PageNet exchange offer, the minimum condition is the
valid tender, without withdrawal, of at least 97.5% of the aggregate outstanding
principal amount of the PageNet notes and not less than a majority of the
outstanding principal amount of each series of PageNet notes. With respect to
the Arch exchange offer, the minimum condition is the valid tender, without
withdrawal, of either:

     - at least 97.5% of the aggregate outstanding principal amount of Arch
       notes;

     - any lower percentage of the aggregate outstanding principal amount of
       Arch notes, as specified by PageNet in its sole discretion; or

     - if the PageNet minimum condition has been satisfied, any percentage of
       the aggregate principal amount of Arch notes not less than 67%, as
       specified by Arch in its sole discretion.

     The conditions to Arch's obligation to complete the merger include:

     - the accuracy of PageNet's material representations and warranties, apart
       from any representations and warranties which would be breached by
       PageNet filing or conducting a bankruptcy case or the filing of an
       involuntary bankruptcy petition or similar creditors' rights petition
       against PageNet;

     - PageNet's performance in all material respects of all its covenants,
       agreements and obligations under the merger agreement;

     - PageNet's receipt of required material consents or approvals to the
       merger and the other transactions contemplated by the merger agreement;

     - the absence of any law or order restraining, enjoining or otherwise
       prohibiting completion of the merger, or of any proceeding seeking to
       prohibit the completion of the merger and the other transactions
       contemplated by the merger agreement;
                                       56
<PAGE>   67

     - Arch's receipt of a favorable tax opinion from Hale and Dorr LLP to the
       effect described under "Material Federal Income Tax Considerations;" and

     - Arch's receipt of an unqualified certificate from PageNet that each of
       the conditions described above has been satisfied, that the PageNet
       stockholders meeting has been convened and PageNet stockholders have:

        - adopted and approved the merger agreement and the merger;

        - increased the authorized number of shares of PageNet common stock to
          an amount sufficient to complete the PageNet exchange offer; and

        - approved the issuance of such common stock;

        except to the extent that stockholder approval is not required due to
        the entry of the final confirmation order of a bankruptcy court.

     The conditions to PageNet's obligation to complete the merger include:

     - the accuracy of Arch's material representations and warranties,

     - Arch's performance in all material respects of all its covenants,
       agreements and obligations under the merger agreement;

     - Arch's receipt of required material consents or approvals to the merger
       and the other transactions contemplated by the merger agreement;

     - PageNet's receipt of a favorable tax opinion from Mayer, Brown & Platt to
       the effect described under "Material Federal Income Tax Considerations;"

     - PageNet's receipt of an unqualified certificate from Arch that each of
       the conditions described above has been satisfied, that the Arch
       stockholders meeting has been convened and Arch stockholders have:

        - increased the authorized number of shares of Arch common stock to an
          amount sufficient to complete the merger, the conversion of the Series
          C preferred stock and the Arch exchange offer;

        - approved the issuance of such common stock; and

        - approved the conversion of each share of Arch Series C preferred stock
          into shares of Arch common stock;

     - the agreement with Arch Series C preferred stockholders for the
       conversion of their Series C preferred stock to Arch common stock is in
       full force and effect; and

     - the spin-off dividend of Vast common stock has been declared or the final
       confirmation order of a bankruptcy court has been entered confirming the
       prepackaged plan.

     At any time before the effective time of the merger, to the extent allowed
by law, Arch or PageNet may waive any of these conditions without the approval
of their respective stockholders. As of the date of this joint proxy
statement/prospectus, neither company expects to waive any condition.

TERMINATION OF THE MERGER AGREEMENT

     Arch and PageNet can mutually agree to terminate the merger agreement at
any time without completing the merger.

                                       57
<PAGE>   68

     Also, either Arch or PageNet can, without the consent of the other,
terminate the merger agreement:

     - if the merger is not completed:

        - before June 30, 2000, if no bankruptcy case has been filed by then, or

        - if a bankruptcy case has been filed, 30 days following the date by
          which a final confirmation order must be entered;

     - if the Arch and PageNet stockholder meetings are held and Arch's or
       PageNet's stockholders do not adopt the transaction; or

     - if any order permanently restraining, enjoining or otherwise prohibiting
       completion of the merger has become final and non-appealable.

     Either party can extend the termination date for up to an additional 90
days if such extension is necessary in order to obtain governmental approvals of
the merger under applicable antitrust laws and if all other conditions to
completion of the merger are satisfied or are capable of being satisfied.
Neither party may terminate the merger agreement in the event the merger is not
completed before April 30, 2000, if such party has materially breached the terms
of the merger agreement and such breach contributed to the failure of the merger
to be completed.

     In addition, PageNet can terminate the merger agreement before the
effective time of the merger if:

     - the board of directors of Arch has withdrawn or adversely modified its
       approval or recommendation of the merger agreement;

     - Arch or its transitory subsidiary has breached any representation,
       warranty, covenant or agreement relating to the merger, and the breach is
       both material and incurable prior to the date at which either Arch or
       PageNet can, without the consent of the other, terminate the merger
       agreement;

     - PageNet receives an unsolicited proposal for a business combination
       transaction with a third party that PageNet's board of directors
       concludes is a superior proposal and PageNet provides Arch with all the
       material terms of the proposal at least two business days prior to
       termination and simultaneously with the termination pays the termination
       fee to Arch; or

     - PageNet's minimum condition is not satisfied or PageNet's stockholders
       have not adopted the merger agreement but the requisite conditions to the
       prepackaged plan are satisfied, and PageNet does not file the bankruptcy
       case and seek confirmation of the prepackaged plan, provided that PageNet
       simultaneously pays the termination fee to Arch.

     Finally, Arch can terminate the merger agreement if:

     - the board of directors of PageNet has withdrawn or adversely modified its
       approval or recommendation of the merger;

     - PageNet has breached any representation, warranty, covenant or agreement
       relating to the merger in the merger agreement, and the breach is both
       material and incurable prior to the date at which either Arch or PageNet
       can, without the consent of the other, terminate the merger agreement,
       but only if the breach does not solely result from the filing or conduct
       of the bankruptcy case or from the filing of an involuntary bankruptcy
       petition against PageNet or any of its subsidiaries;

     - an order of a bankruptcy court approving of the nonsolicitation of
       competing proposals and the payment by PageNet of the termination fee has
       not been entered within 30 days of the commencement of the bankruptcy
       case;

     - an order of a bankruptcy court confirming the prepackaged plan is not
       entered within 120 days of the commencement of the bankruptcy case or a
       later date mutually agreeable to Arch and PageNet;

                                       58
<PAGE>   69

     - the prepackaged plan is amended, modified or added to in any material
       respect without the written consent of Arch;

     - Arch receives an unsolicited proposal for a business combination
       transaction with a third party that Arch's board of directors concludes
       is a superior proposal and Arch provides PageNet with all the material
       terms of the proposal at least two business days prior to termination and
       simultaneously with the termination pays the termination fee to PageNet.

TERMINATION FEE

     Arch and its subsidiaries, jointly and severally, must pay PageNet a
termination fee of $40.0 million by wire transfer of same day funds if:

     - Arch, its stockholders or its noteholders receives an acquisition
       proposal from a third party or a third party publicly announces an
       intention to make an acquisition proposal and:

          - Arch's stockholders subsequently do not approve the transaction or
            Arch's noteholders do not satisfy the Arch minimum condition with
            respect to the Arch exchange offer;

          - the merger agreement is terminated; and

          - Arch either executes and delivers an agreement with a third party
            relating to an acquisition proposal or an acquisition with respect
            to Arch is completed, in either case, within 12 months of the
            termination of the merger agreement;

     - PageNet terminates the merger agreement because:

          - the Arch board of directors has withdrawn or adversely modified its
            approval or recommendation of the merger agreement;

          - Arch or its transitory subsidiary has breached any representation,
            warranty, covenant or agreement concerning:

             - the restrictions on acquisition proposals; or

             - Arch's board of directors taking all actions necessary to convene
               a stockholders meeting to consider and vote upon and recommend
               that the stockholders approve:

                - an increase in the authorized number of shares of Arch common
                  stock to an amount sufficient to complete the merger and the
                  Arch exchange offer and the issuance such common stock; and

                - the conversion of each share of Arch Series C preferred stock
                  into shares of Arch common stock; or

     - Arch terminates the merger agreement in response to a superior
       acquisition proposal by a third party.

     PageNet and its subsidiaries, jointly and severally, must pay Arch a fee of
$40.0 million by wire transfer of same day funds if:

     - PageNet, its stockholders or its noteholders receives an acquisition
       proposal from a third party or a third party publicly announces an
       intention to make an acquisition proposal and:

          - PageNet's stockholders subsequently do not adopt the merger
            agreement or PageNet's noteholders do not satisfy the PageNet
            minimum condition with respect to the PageNet exchange offer, and a
            bankruptcy court fails to enter the final confirmation order;

          - the merger agreement is terminated; and

                                       59
<PAGE>   70

          - PageNet either executes and delivers an agreement with a third party
            relating to an acquisition proposal or an acquisition with respect
            to PageNet is completed, in either case, within 12 months of the
            termination of the merger agreement;

     - Arch terminates the merger agreement because:

          - the PageNet board of directors has withdrawn or adversely modified
            its approval or recommendation of the merger agreement;

          - PageNet has breached any representation, warranty, covenant or
            agreement concerning:

             - the restrictions on acquisition proposals; or

             - PageNet's board of directors taking all actions necessary to
               convene a stockholders meeting to consider and vote upon and
               recommend that the stockholders approve (unless a bankruptcy case
               has commenced, or PageNet has stipulated to bankruptcy relief
               after the filing of an involuntary bankruptcy petition against it
               or its subsidiaries):

                - the adoption of the merger agreement;

                - the merger; and

                - an increase in the authorized number of shares of PageNet
                  common stock to an amount sufficient to complete the PageNet
                  exchange offer and the issuance of such common stock;

     - the prepackaged plan is withdrawn without the prior written consent of
       Arch, or PageNet files any other plan of reorganization or amends,
       modifies or adds to any material provision of the prepackaged plan in
       each case without the prior written consent of Arch;

     - any other plan of reorganization filed by a person other than PageNet is
       confirmed by a bankruptcy court;

     - PageNet files a motion to sell or otherwise transfer all or substantially
       all of its assets as part of a sale under the Bankruptcy Code without the
       prior written consent of Arch;

     - PageNet terminates the merger agreement in response to a superior
       acquisition proposal by a third party; or

     - the requisite conditions to the prepackaged plan are satisfied but
       PageNet does not file the bankruptcy case and seek confirmation of the
       prepackaged plan.

     Subject to the possible payment of a termination fee, each of Arch and
PageNet will pay all expenses it incurs in connection with the merger and
related transactions, except that they will share fees paid to the SEC, the
Federal Trade Commission, the Federal Communications Commission and other
federal or state agencies, and all printing and mailing costs incurred in
connection with the merger, equally.

MODIFICATION OR AMENDMENT OF THE MERGER AGREEMENT

     At any time prior to the effective time, Arch and PageNet can modify or
amend the merger agreement if they both agree to do so. Each can waive its right
to require the other to comply with the merger agreement where the law allows.

                                       60
<PAGE>   71

                           THE SPIN-OFF DISTRIBUTION

GENERAL

     The merger agreement provides that PageNet will distribute 11.6% of the
total equity of Vast (subject to the possibility of dilution) to its
stockholders. To satisfy the merger agreement, the PageNet board of directors
will declare a dividend consisting of 2,320,000 shares of Class B common stock
of Vast payable to the persons who are PageNet stockholders immediately prior to
the acceptance of senior subordinated notes in the PageNet exchange offer. The
dividend will not be paid unless all of the conditions to the merger have been
satisfied. Because the dividend will be declared prior to the acceptance of
senior subordinated notes in the exchange offer, noteholders who become
stockholders of PageNet in the PageNet exchange offer will not be entitled to
receive any portion of this distribution.

MANNER OF EFFECTING THE SPIN-OFF DISTRIBUTION

     If all of the conditions to the merger are satisfied, on the closing date
of the merger, PageNet will deliver all 2,320,000 shares of Class B common stock
of Vast to the distribution agent. As soon as practicable after that date, the
distribution agent will mail certificates for such shares to the PageNet
stockholders entitled to receive these shares.

DETERMINATION OF THE DISTRIBUTION RATIO

     PageNet estimates that the number of shares of Vast that PageNet
stockholders will receive as a result of the spin-off distribution is 0.0223 of
a share of Vast Class B common stock for each share of PageNet common stock. The
fraction that PageNet stockholders will receive will equal 2,320,000 divided by
the number of shares of PageNet common stock outstanding as of immediately prior
to the acceptance of senior subordinated notes in the exchange offer. The 0.0223
estimate is based on the 103,960,240 shares of PageNet common stock outstanding
on December 1, 1999.

MATERIAL FEDERAL INCOME TAX CONSIDERATIONS

     It is expected that the distribution of shares of Class B common stock of
Vast will generally be treated as a distribution in exchange for PageNet common
stock, although this treatment is not free from doubt. See "Material Federal
Income Tax Considerations".

                                       61
<PAGE>   72

                     THE PREPACKAGED PLAN OF REORGANIZATION

     In this section, we use the term "PageNet companies" to refer to Paging
Network, Inc. and some of its operating subsidiaries.

     In some circumstances, the PageNet companies may commence cases under
chapter 11 of the Bankruptcy Code and seek to confirm the Plan and thereby bind
the PageNet companies' noteholders and stockholders to the terms of the merger
and the exchange offer. The following is a summary of some matters of
significance to Arch or PageNet stockholders that would occur either pursuant to
or in connection with the filing of the chapter 11 cases and confirmation of the
Plan. Additional information about the Plan is contained in a prospectus of
PageNet which has been distributed to all PageNet stockholders and to PageNet
noteholders.

CLASSIFICATION OF CLAIMS AND EQUITY INTERESTS UNDER THE PLAN

     The Bankruptcy Code requires that the Plan classify the claims against, and
equity interests in, the PageNet companies. The PageNet companies believe that
all claims and equity interests have been appropriately classified in the Plan.
The PageNet companies have separately classified general unsecured claims,
mostly claims of trade creditors, from claims arising under PageNet's senior
subordinated notes. Many of the holders of general unsecured claims are key
suppliers of products and services to the PageNet companies. A failure by
PageNet to pay these trade creditors in accordance with the terms agreed upon
could adversely affect the ability of the PageNet companies to obtain essential
trade credit and could substantially impair the ability of the PageNet companies
to do business with trade creditors whose goods and services are essential to
the PageNet companies.

     The Bankruptcy Code also requires that the Plan provide the same treatment
for each claim or equity interest of a particular class unless the holder of a
particular claim or equity interest agrees to a less favorable treatment of its
claim or equity interest. The PageNet companies believe that the Plan complies
with this requirement of equal treatment.

     A class of claims or equity interests that is impaired under the Plan is
entitled to vote to accept or reject the Plan, unless the class will not receive
or retain any property under the Plan in which case the class is deemed to have
rejected the Plan. A class of claims or equity interests is not impaired if the
plan does not alter the legal, equitable or contractual rights of the holders of
such claims or equity interests. Under the Bankruptcy Code, holders of claims or
equity interests which are not impaired are conclusively presumed to have
accepted the Plan.

     The Plan classifies creditor claims and stockholder interests as follows:

<TABLE>
<CAPTION>
CLASS                                                STATUS             VOTING RIGHTS
- -----                                              ----------    ---------------------------
<S>                                                <C>           <C>
Class 1 -- Priority Claims                         Unimpaired    -- not entitled to vote
Class 2 -- Bank Secured Claims                     Impaired      -- entitled to vote
Class 3 -- Other Secured Claims                    Unimpaired    -- not entitled to vote
Class 4 -- General Unsecured Claims                Unimpaired    -- not entitled to vote
Class 5 -- Senior Subordinated Note Claims         Impaired      -- entitled to vote
Class 6 -- Old Stock Related Claims                Impaired      -- entitled to vote
Class 7 -- Old Stock Interests                     Impaired      -- entitled to vote
Class 8 -- Subsidiary Stock Interests and          Impaired      -- entitled to vote
           Subsidiary Claims
</TABLE>

TREATMENT OF PAGENET STOCKHOLDER RIGHTS UNDER THE PLAN

     The claims and interests of PageNet stockholders are classified as Class 6
claims or Class 7 interests under the Plan.

                                       62
<PAGE>   73

     Class 6 -- Old Stock Related Claims

     (a) Classification:  Old stock related claims consist of the claims, if
any, for rescission of a purchase or sale of an equity interest in Paging
Network, Inc. for damages arising from the purchase or sale of such an equity
interest, or for reimbursement or contribution on account of such claim. Proofs
of claim with respect to any old stock related claims will be required to be
filed on or before a bar date to be set by the bankruptcy court or such claims
will be forever barred and discharged. Any such old stock related claims shall
be deemed to be subordinated to all other creditor claims pursuant to the
Bankruptcy Code and shall have the same priority as Class 7 old stock interests.

     (b) Treatment:  On the later of (1) the effective date, or (2) the date an
old stock related claim becomes an allowed claim, the holder of such an allowed
old stock related claim will receive, together with the holders of allowed Class
7 old stock interests, a pro rata share of (x) the Arch common stock available
to Paging Network, Inc. stockholders under the merger agreement and (y) the
2,320,000 shares of the Class B common stock of Vast.

     (c) Voting:  Old stock related claims are impaired and the holders of
allowed stock related claims are entitled to vote to accept or reject the Plan.

     Class 7 -- Old Stock Interests

     (a) Classification:  Old stock interests consist of all equity interests in
PageNet.

     (b) Treatment:  On the effective date each holder of an allowed old stock
interest (excluding Arch and any of its subsidiaries) will receive, together
with the holders of allowed Class 6 old stock related claims, a pro rata share
of (1) Arch common stock available to Paging Network, Inc. stockholders under
the merger agreement, and (2) the 2,320,000 shares of Class B common stock of
Vast.

     (c) Voting:  Old stock interests are impaired and the holders of allowed
old stock interests are entitled to vote to accept or reject the Plan.

     The PageNet companies do not believe that there are any Class 6 claims. The
Plan provides that holders of allowed Class 6 claims and Class 7 interests will
receive a pro rata share of Arch common stock and Vast Class B common stock. As
of December 1, 1999, for each 100 shares of PageNet common stock, the Plan
provides for distribution of (i) 12.47 shares of Arch common stock and (ii) 2.23
shares of Vast Class B common stock, assuming there are no Class 6 old stock
related claims.

OTHER PROVISIONS OF THE PLAN AND INTENDED ACTIONS DURING THE CHAPTER 11 CASES

  Releases

     With some exceptions the PageNet companies will release pursuant to the
Plan the holders of PageNet secured bank claims, Arch, its subsidiaries and
their officers, directors and agents and PageNet companies' officers and
directors of all claims which the PageNet companies may have against any of them
except for claims under the merger agreement, other contractual claims and
claims for fraud, gross negligence or willful misconduct.

  Indemnification of Directors, Officers and Employees

     The Plan provides that the obligations of the PageNet companies to
indemnify any person serving at any time on or prior to the effective date as
one of its directors, officers, or employees by reason of such person's service
in such capacity, to the extent provided in the PageNet companies' constituent
documents or by written agreement or Delaware law, shall be deemed and treated
as executory contracts that are assumed by the PageNet companies as of the
effective date. Accordingly, such indemnification obligations shall survive
unimpaired and unaffected by entry of the confirmation order, irrespective of
whether such indemnification becomes owing on account of an act or event
occurring before or after the commencement of the chapter 11 cases.

                                       63
<PAGE>   74

  Provisions Relating to the Merger Agreement

     Under the merger agreement, upon the commencement of the chapter 11 cases
the PageNet companies are required to seek bankruptcy court approval of the
provisions of the merger agreement that restrict the PageNet companies' ability
to solicit other offers for the PageNet companies' businesses, and that require
(1) the PageNet companies to pay a termination fee to Arch upon specified
termination events and (2) Arch to pay a termination fee to the PageNet
companies upon specified termination events. The PageNet companies intend to
seek such approval from the bankruptcy court pursuant to the terms of the merger
agreement. In the event such approval is not obtained within 30 days of the
commencement of the chapter 11 cases, Arch has the right to terminate the merger
agreement without paying a termination fee to the PageNet companies.

     In addition, the Plan provides that on the confirmation date, the PageNet
companies will be deemed to have assumed the merger agreement unless the merger
agreement is assumed by the PageNet companies prior to the confirmation date
pursuant to an order of the bankruptcy court.

  Payment of Prepetition General Unsecured Claims

     During the pendency of the chapter 11 cases that may be filed in connection
with the restructuring, the PageNet companies intend to operate their businesses
in the ordinary course and to make payment in full on a timely basis for all
goods and services provided after the commencement of the chapter 11 cases. The
PageNet companies also will seek approval immediately upon the filing of their
petitions to pay in full in the ordinary course of business the pre-petition
claims owing to general unsecured creditors that were incurred in the ordinary
course of PageNet's business (not including claims under the senior subordinated
notes or old stock related claims). Management expects that the PageNet
companies will have sufficient funds to pay their prepetition and postpetition
general unsecured creditors in the ordinary course of business through the
conclusion of the chapter 11 cases.

  Provisions for Employees; Retention Programs; Employment Contracts

     The PageNet companies intend to seek relief from the bankruptcy court so
that salaries, wages accrued and unpaid vacation, health benefits, severance
benefits and similar employee benefits will be unaffected by the filing of the
chapter 11 cases. The PageNet companies intend to seek the approval of the
bankruptcy court, immediately upon commencement of the chapter 11 cases, to
honor payroll checks outstanding as of the date of the commencement of the
chapter 11 cases, to permit employees to utilize their paid vacation time which
was accrued prior to the filing and to continue paying medical and other
employee benefits under the applicable health plans. The PageNet companies also
intend to seek the authority to honor their executive retention program and
employee retention program and assume employee contracts with certain executives
and key managers. There can be no assurance, however, that all or part of such
approval will be obtained. Employee claims and benefits not paid or honored, as
the case may be, prior to the consummation of the Plan, will be paid or honored
upon consummation or as soon thereafter as such payment or other obligation
becomes due or payable. Employee benefit claims that accrue prior to the date of
the commencement of the chapter 11 cases, will receive unimpaired treatment
under the terms of the Plan.

STANDARDS FOR CONFIRMATION OF PLAN

     The Bankruptcy Code sets forth the requirements that must be satisfied to
confirm a plan of reorganization. A number of the more significant confirmation
requirements are discussed below. The PageNet companies believe that they have
complied or will comply with each of these requirements.

                                       64
<PAGE>   75

  Good Faith and Compliance with Law

     The Bankruptcy Code requires that a plan of reorganization be proposed in
good faith and disclose certain relevant information regarding payments due and
the nature of compensation to insiders. The PageNet companies believe they have
satisfied these requirements and will seek a ruling to that effect from the
bankruptcy court in connection with confirmation of the Plan.

  Best Interests

     The Bankruptcy Code requires that, with respect to each impaired class,
each member of such class either:

     - accepts the Plan; or

     - will receive or retain under the Plan on account of its claim or equity
       interest property of a value, as of the effective date, that is at least
       equal to the value of the property that such member of the class would
       receive or retain if the PageNet companies were liquidated under chapter
       7 of the Bankruptcy Code.

The PageNet companies' management is preparing a hypothetical Chapter 7
liquidation analysis to indicate the estimated net present values which would be
allocated to PageNet's creditors and equity holders if the PageNet companies'
assets were liquidated. Subject to completion of the liquidation analysis, the
PageNet companies believe that the Plan will provide members of each impaired
class with at least what they would receive in a chapter 7 liquidation, and
therefore the Plan meets this test. For further information on the liquidation
analysis, we refer you to the filings by PageNet with the SEC in connection with
this matter.

  Feasibility

     The Bankruptcy Court must also determine that the Plan is feasible and is
not likely to be followed by liquidation or further reorganization of the
PageNet companies. To determine whether the Plan meets this requirement, the
PageNet companies have analyzed their ability, along with Arch, to meet their
obligations under the Plan. This analysis includes a forecast of financial
performance of Arch and the reorganized PageNet companies. Based upon such
forecast, the PageNet companies believe that they will have the financial
capability to satisfy their obligations following the effective date of the
Plan. Accordingly, the PageNet companies will seek a ruling to that effect in
connection with the confirmation of the Plan.

  Plan Acceptance

     The Bankruptcy Code requires, subject to certain exceptions, that the Plan
be accepted by all impaired classes of claims and equity interests. Classes of
claims that are not "impaired" under a plan are deemed to have accepted the plan
and are not entitled to vote. A class of claims accepts a plan if the holders of
at least 66 2/3% in dollar amount and more than one-half in number of the
allowed claims in that class that actually vote on the plan, vote to accept the
plan. A class of equity interests accepts a plan if at least 66 2/3% of the
allowed interests in that class that actually vote on the plan vote to accept
the plan. Holders of claims or equity interests who fail to vote or who abstain
will not be counted to determine the acceptance or rejection of the Plan by any
impaired class. The PageNet companies may, however, request confirmation of the
Plan even though some impaired classes have not accepted the Plan.

     As part of the prepackaged Plan, PageNet intends to solicit acceptance of
the Plan prior to the filing of the chapter 11 cases. The Bankruptcy Code
provides that acceptances obtained prior to the filing of a petition will be
effective in a chapter 11 case only if the pre-petition solicitation of the
acceptances complied with applicable non-bankruptcy law governing the adequacy
of disclosure, such as federal securities laws and regulations. For example,
under the Securities Act, no offer to buy or sell a security may be made except
pursuant to an effective registration statement. If there is no such applicable
non-bankruptcy law, "adequate information" as defined under the Bankruptcy Code
requires that information sufficient to enable a hypothetical reasonable
investor to make an informed judgment with respect to the Plan be furnished in
connection with the solicitation. The PageNet companies intend to use the
ballots
                                       65
<PAGE>   76

received pursuant to the solicitation of PageNet's stockholders and noteholders
pursuant to a prospectus filed with the SEC on January 11, 2000 to confirm the
Plan if they file their chapter 11 cases. The PageNet companies believe that
this solicitation complies with such applicable non-bankruptcy law and otherwise
contains "adequate information" as required under the Bankruptcy Code and will
seek appropriate findings from the bankruptcy court in this regard. If the
bankruptcy court approves the solicitation process and materials, then those
holders of claims against and interests in PageNet which were solicited prior to
the filing of the chapter 11 cases will be bound by their pre-chapter 11 case
votes. If the bankruptcy court does not approve the solicitation process and
materials, PageNet may be required to re-solicit such acceptances of the Plan
with a bankruptcy court-approved disclosure statement.

CONFIRMATION OF THE PLAN WITHOUT ACCEPTANCE BY ALL CLASSES OF IMPAIRED CLAIMS

     In the event that all classes of PageNet's creditors and equity holders do
not accept the Plan, the Bankruptcy Code allows the PageNet companies to confirm
the Plan even if one or more, but not all, of the impaired classes rejects the
Plan. If the PageNet companies can demonstrate to the Bankruptcy Court that the
Plan satisfies the requirements of the "cramdown" provision, each impaired class
that voted to reject the Plan would, nonetheless, be bound to the treatment
afforded to that class under the Plan.

     To obtain confirmation of the Plan using the "cramdown" provision, the
PageNet companies must demonstrate to the Bankruptcy Court that, as to each
class that has rejected the Plan, the treatment afforded to such class under the
Plan "does not discriminate unfairly" and is "fair and equitable."

     In general, a plan does not discriminate unfairly if it provides a
treatment to the class that is substantially equivalent in value to the
treatment that is provided to other classes consisting of claims that have equal
rank. The Bankruptcy Code applies a different test to holders of secured claims,
unsecured claims and equity interests to determine whether the treatment
proposed in a plan of reorganization is "fair and equitable." For secured
claims, the Plan must either provide that the holder will retain its lien and
receive cash payments equal to its claim, or the holder must receive property
that is the indubitable equivalent of the claim. For unsecured claims, the Plan
must provide that the holder will retain property having a value equal to the
amount of its claim, or that no holder of a claim or interest that is junior to
the creditor will receive any value under the Plan. For equity interest holders,
the Plan must provide that no holder of an interest that is junior to the holder
will receive any value under the plan of reorganization.

     In the event that any impaired class fails to accept the Plan, the PageNet
companies reserve the right (1) to request that the bankruptcy court confirm the
Plan in accordance with the "cramdown" provision under the Bankruptcy Code
and/or (2) to modify the Plan. Any such confirmation would be subject to
judicial approval.

                   MATERIAL FEDERAL INCOME TAX CONSIDERATIONS

SCOPE AND LIMITATION

     The following general discussion summarizes certain federal income tax
considerations generally applicable to the holders of Arch common stock and to
the holders of PageNet common stock who, pursuant to the merger, exchange their
PageNet common stock for Arch common stock and receive the distribution of
shares of Vast pursuant to the merger agreement. This discussion assumes that
the Arch stockholder or PageNet stockholder, as the case may be, is a citizen or
resident of the United States for federal income tax purposes, and holds the
shares of Arch common stock or PageNet common stock as capital assets. This
discussion does not purport to be a complete analysis of all the potential tax
effects that may be relevant to a particular stockholder and does not address
the federal income tax consequences relevant to particular categories of
stockholders subject to special treatment under the federal income tax laws,
such as broker-dealers, financial institutions, life insurance companies,
tax-exempt entities and foreign individuals and entities and stockholders who
acquired their common stock by exercising an employee stock option or otherwise
as compensation. In addition, it does not describe any tax consequences arising
out of the laws of any state, locality, or foreign jurisdiction.
                                       66
<PAGE>   77

     This discussion is based upon the Internal Revenue Code of 1986, as
amended, temporary and final Treasury Regulations promulgated thereunder,
proposed Treasury Regulations, published rulings, notices and other
administrative pronouncements of the Internal Revenue Service, and judicial
decisions now in effect, all of which are subject to change at any time by
legislative, judicial, or administrative action. Any such changes may be
retroactively applied in a manner that could adversely affect a stockholder. No
rulings have been requested from the Internal Revenue Service concerning any of
the matters described in this joint proxy statement/prospectus. In some cases,
particularly those as to which the discussion below is qualified, there is a
risk that the Internal Revenue Service will disagree with the conclusions set
forth.

     HOLDERS OF PAGENET COMMON STOCK ARE URGED TO CONSULT THEIR TAX ADVISORS AS
TO THE PARTICULAR TAX CONSEQUENCES TO THEM OF THE TRANSACTION DESCRIBED IN THIS
JOINT PROXY STATEMENT/PROSPECTUS, INCLUDING THE APPLICABILITY AND EFFECT OF ANY
STATE, LOCAL OR FOREIGN TAX LAWS, AND OF CHANGES IN APPLICABLE TAX LAWS.

QUALIFICATION OF THE MERGER AS A TAX-FREE REORGANIZATION

     The obligations of Arch and PageNet to consummate the merger are
conditioned respectively upon the receipt by Arch of the opinion of Hale and
Dorr LLP, counsel to Arch, and by PageNet of the opinion of Mayer, Brown &
Platt, counsel to PageNet, that on the basis of the facts, representations and
assumptions set forth or referred to in the opinion, for U.S. federal income tax
purposes, the merger will qualify as a tax free reorganization under Section
368(a) of the Internal Revenue Code, and that each of PageNet, the transitory
subsidiary of Arch which will merge into PageNet, and Arch will be a party to
the reorganization within the meaning of Section 368(b) of the Internal Revenue
Code. The discussion below assumes that the merger will be treated in accordance
with the opinions of Hale and Dorr LLP and Mayer, Brown & Platt, described in
the preceding sentence, which are included as exhibits 8.1 and 8.2 to the
registration statement of which this joint proxy statement/prospectus forms a
part. However, neither PageNet nor Arch has requested or will request an advance
ruling from the Internal Revenue Service as to the tax consequences of the
merger, and there can be no assurance that the Internal Revenue Service will
agree with the conclusions set forth in these opinions. Moreover, the tax
opinions are based upon certain facts, representations and assumptions set forth
or referred to in the opinions, including representations concerning the
expected relative values of Arch common stock to be issued as consideration in
the merger and the value of the Class B common stock of Vast to be distributed
to PageNet stockholders. These representations will be set forth in certificates
to be delivered to counsel at the effective time of the merger by the management
of each of PageNet and Arch. Investment bankers' certificates as to the
reasonableness of the assumed values for Arch common stock and the Class B
common stock of Vast will also be given. If the relative values of the Arch
common stock and the Class B common stock of Vast differ materially from the
assumptions, or if the certificates to be issued by Arch and PageNet are
otherwise incorrect in certain material respects, the conclusions reached by
counsel in their tax opinions would be jeopardized.

FEDERAL INCOME TAX CONSEQUENCES TO PAGENET COMMON STOCKHOLDERS

     Because the distribution of Class B common stock of Vast and the merger are
mutually interdependent transactions, that is, the distribution of Vast stock
will not occur unless the merger occurs, they should be considered a single
integrated transaction for federal income tax purposes. Accordingly, counsel is
of the view that each PageNet common stockholder should be considered for
federal income tax purposes as exchanging (1) a portion of each share of PageNet
common stock for Class B common stock of Vast, and (2) the remaining portion of
each share for Arch common stock in the merger. The portion of a share of
PageNet common stock treated as exchanged for Class B common stock of Vast would
equal the fair market value of the Class B common stock of Vast received divided
by the aggregate fair market value of the Class B common stock of Vast and the
Arch common stock received (including amounts received in lieu of fractional
shares). The remaining portion of the share of PageNet common stock received
would be treated as exchanged for Arch common stock. The discussion below
reflects this treatment.

                                       67
<PAGE>   78

  Receipt of Arch Common Stock Pursuant to the Merger

     Assuming that the merger qualifies as a "reorganization" under Section
368(a) of the Internal Revenue Code, a PageNet common stockholder will not
recognize any gain or loss as a result of the receipt of Arch common stock
(except for cash received in lieu of fractional share interests). A PageNet
common stockholder's aggregate tax basis for the Arch common stock received,
including any fractional share interest for which cash is received, will equal
such stockholder's aggregate tax basis in the portion of the shares of PageNet
common stock exchanged for Arch common stock (determined as described above)
pursuant to the merger. A PageNet common stockholder's holding period for the
Arch common stock received, including any fractional share interest for which
cash is received, will include the period during which the shares of PageNet
common stock were held.

     A holder of PageNet common stock that receives cash in lieu of a fractional
Arch common stock in the merger generally will recognize capital gain or loss in
an amount equal to the difference between the amount of cash received and such
holder's adjusted tax basis allocable to such fractional share.

     If the merger does not qualify as a "reorganization" under Section 368(a)
of the Internal Revenue Code, a PageNet common stockholder would recognize gain
or loss with respect to the portion of each share of PageNet common stock
surrendered in the merger equal to the difference between the stockholder's tax
basis in that portion of the PageNet common stock held immediately prior to the
merger, and the fair market value, as of the effective time of the merger of the
Arch common stock received in exchange therefor. Any such gain or loss would be
capital gain or loss and would be long-term capital gain or loss if the
stockholder's holding period for the share surrendered exceeds one year at the
time of the merger. Capital losses generally may be used by a corporate taxpayer
only to offset capital gains, and by an individual taxpayer only to the extent
of capital gains plus $3,000 of other income per year. If this treatment were to
apply, a PageNet common stockholder's aggregate basis in the Arch common stock
received would equal its fair market value at the effective time of the merger,
and the stockholder's holding period for such Arch common stock would begin the
day after the effective time of the merger.

  Effect of Receipt of the Shares of Class B Common Stock of Vast

     The distribution by PageNet of Class B common stock of Vast in exchange for
a portion of the shares of PageNet common stock held immediately prior to the
merger (determined as described above) should be treated as a redemption of
stock to which Section 302 of the Internal Revenue Code applies. Because as a
result of the merger and the exchange offer each PageNet common stockholder's
interest in the combined company will be substantially reduced, the shares of
Class B common stock of Vast should generally be treated as received by a
PageNet common stockholder in exchange for the amount of such holder's PageNet
common stock treated as redeemed. In this case, the redemption of a holder's
PageNet common stock for shares of Class B common stock of Vast will result in
capital gain or loss equal to the difference between the fair market value of
the shares of Class B common stock of Vast received (plus the amount of any cash
received in lieu of fractional shares) and the stockholder's tax basis in the
portion of the PageNet common stock treated as redeemed. Such gain or loss will
be long-term capital gain or loss if the holding period for the PageNet common
stock exceeds one year.

     The foregoing treatment may not apply to PageNet common stockholders who
hold PageNet or Arch notes or who own Arch common stock, either directly or
constructively under the rules of Section 318 of the Internal Revenue Code. In
some of such cases (such as where a PageNet common stockholder's interest in
PageNet is not reduced), the value of the shares of Class B common stock of Vast
received could be taxable as a dividend, to the extent of PageNet's current or
accumulated earnings and profits, if any, and then applied against the
stockholder's tax basis for the PageNet shares. The stockholder will recognize
capital gain to the extent the non-dividend portion of the distribution exceeds
the stockholder's tax basis for the PageNet shares.

     Although counsel believes the foregoing treatment is likely, it is possible
that the Internal Revenue Service would seek to characterize the receipt of
Class B common stock of Vast differently. First, the receipt of the Class B
common stock of Vast could be taxed as a dividend (to the extent of PageNet's
                                       68
<PAGE>   79

current or accumulated earnings and profits) in accordance with the technical
corporate form of the distribution. Second, the value of the Class B common
stock in Vast could possibly be characterized as "boot" distributed pursuant to
the merger. In the latter case, a PageNet common stockholder's gain (determined
as the excess, if any, of the aggregate value of the Arch common stock received
and the shares of Class B common stock of Vast received by a PageNet common
stockholder over such stockholder's tax basis in his or her PageNet common
stock) would be subject to tax, but not in excess of the value of the shares of
Class B common stock of Vast received by the stockholder. In either case, no
loss could be recognized. Basis and holding period consequences would differ
from those set forth above.

FEDERAL INCOME TAX CONSEQUENCES TO ARCH COMMON STOCKHOLDERS

     Holders of Arch common stock will not recognize gain or loss for United
States federal income tax purposes as a result of the merger.

FEDERAL INCOME TAX CONSEQUENCES TO ARCH AND PAGENET

     While the merger is expected generally to be tax-free to each of Arch and
PageNet, each company is expected to realize cancellation of indebtedness income
resulting from the elimination in the exchange offers of indebtedness in
exchange for consideration having a value less than the adjusted issue price of
the outstanding debt, and in the case of PageNet, to realize income from the
distribution of shares of Class B common stock of Vast to the extent the fair
market value of such shares exceeds PageNet's tax basis for the shares. The
exact amount of the tax liability attributable to such income cannot be
determined precisely, because it depends on the values of the Arch common stock
and of the shares of Class B common stock of Vast distributed at the time of the
closing, and on certain other factors. However, under the merger agreement,
neither Arch nor PageNet is obligated to complete the merger if the reasonably
expected amount of "out-of-pocket" tax liability exceeds $25 million. Based on
an assumed closing of the transactions in June 2000, and on the values currently
expected at that time for the Arch common stock and the shares of Class B common
stock of Vast, the companies expect that the tax liability will be less than
this amount. The merger and the exchange offers are expected to result in the
elimination of substantially all of the tax benefit of the net operating loss
carryforwards and certain other tax attributes of each of PageNet and Arch which
would otherwise be available to offset future taxable income of the combined
companies.

                                       69
<PAGE>   80

                                 CAPITALIZATION

     The following table sets forth the capitalization of Arch and PageNet, on a
consolidated basis, at September 30, 1999 and the capitalization of Arch as
adjusted to give effect to the merger and the Arch and PageNet exchange offers,
assuming that all of the outstanding Arch discount notes and all of the
outstanding PageNet senior subordinated notes are tendered and giving effect to
the repurchase of $16.3 million accreted value of discount notes by Arch in
October 1999 in exchange for Arch common stock. You should read this table
together with the other financial information appearing elsewhere in this joint
proxy statement/prospectus.

<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30, 1999    AS ADJUSTED
                                                              -------------------------   -----------
                                                                 ARCH         PAGENET     ARCH(1)(2)
                                                              -----------   -----------   -----------
<S>                                                           <C>           <C>           <C>
ARCH CURRENT MATURITIES OF LONG-TERM DEBT...................  $    3,060    $       --    $    3,060
                                                              ----------    ----------    ----------
ARCH LONG-TERM DEBT, LESS CURRENT MATURITIES:
  Senior bank debt..........................................     446,940            --     1,236,940
  10 7/8% senior discount notes due in 2008.................     399,922            --            --
  6 3/4% convertible subordinated debentures due 2003.......      13,364            --        13,364
  12 3/4% senior notes due 2007.............................     127,816            --       127,816
  13 3/4% senior notes due 2008.............................     140,151            --       140,151
  9 1/2% senior notes due 2004..............................     125,000            --       125,000
  14% senior notes due 2004.................................     100,000            --       100,000
  Other.....................................................       4,550            --        58,870
PAGENET LONG-TERM DEBT, LESS CURRENT MATURITIES:
  Credit agreement..........................................          --       745,000            --
  8.875% senior subordinated notes due February 1, 2006.....          --       300,000            --
  10.125% senior subordinated notes due August 1, 2007......          --       400,000            --
  10% senior subordinated notes due October 15, 2008........          --       500,000            --
  Other.....................................................          --        54,320            --
                                                              ----------    ----------    ----------
         Total long-term debt, less current maturities......   1,357,743     1,999,320     1,802,141
                                                              ----------    ----------    ----------
ARCH STOCKHOLDERS' EQUITY:
Preferred stock -- $.01 par value, authorized 10,000,000
  shares, issued and outstanding 250,000 shares ($27,618
  aggregate liquidation preference).........................           3            --            --
Common stock and Class B common stock -- $.01 par value,
  authorized 75,000,000 shares (225,000,000 as adjusted),
  issued and outstanding 48,060,782 (172,026,665 as
  adjusted).................................................         481            --         1,720
Additional paid-in capital..................................     639,559            --     1,367,249
Accumulated deficit.........................................    (820,935)           --      (613,846)
PAGENET STOCKOWNERS' EQUITY:
Preferred stock -- $.01 par value, authorized 25,000,000
  shares, no shares issued or outstanding...................          --            --            --
Common stock -- $.01 par value, authorized 250,000,000
  shares (0 as adjusted), issued and outstanding 103,960,240
  shares (0 as adjusted)....................................          --         1,040            --
Additional paid-in capital..................................          --       134,161            --
Accumulated other comprehensive income......................          --         1,161            --
Accumulated deficit.........................................          --      (860,786)           --
                                                              ----------    ----------    ----------
         Total stockholders' equity.........................    (180,892)     (724,424)      755,123
                                                              ----------    ----------    ----------
         Total capitalization...............................  $1,179,911    $1,274,896    $2,560,324
                                                              ==========    ==========    ==========
</TABLE>

- ---------------

(1) If none of the Arch discount notes are exchanged, total long-term debt, less
    current maturities would be $2.2 billion, total stockholders' equity would
    be $376.5 million and total capitalization would be $2.5 billion.

(2) If 50% of the Arch discount notes are exchanged, total long-term debt, less
    current maturities would be $2.0 billion, total stockholders' equity would
    be $565.8 million and total capitalization would be $2.5 billion.

                                       70
<PAGE>   81

        UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

     The following unaudited pro forma financial statements of Arch and PageNet
give effect to the following transactions as if they were consummated as of
September 30, 1999 with respect to the unaudited pro forma balance sheet, except
for Arch's acquisition of MobileMedia which closed prior to September 30, 1999,
and on January 1, 1998 with respect to the unaudited pro forma statements of
operations:

     - Arch's acquisition of MobileMedia, which closed on June 3, 1999;

     - the exchange of $383.6 million (accreted value) of Arch discount notes
       for 29.7 million shares of Arch common stock,

     - the conversion of 250,000 shares of Arch convertible preferred stock into
       2.1 million shares of Arch common stock;

     - the repurchase of $16.3 million (accreted value) of Arch discount notes
       for 2.3 million shares of Arch common stock in October 1999;

     - the exchange of $1.2 billion of PageNet senior subordinated notes and
       accrued interest thereon for 616.8 million shares of PageNet common stock
       and 13.8 million shares of Vast Class B common stock;

     - the distribution by PageNet of 2.3 million shares of Vast Class B common
       stock to the current PageNet stockholders; and

     - Arch's merger with PageNet.

     The pro forma financial statements utilize the purchase method of
accounting for the merger of Arch and PageNet. Arch is the acquiring company for
accounting purposes. Under the purchase method of accounting, the purchase price
is allocated to assets acquired and liabilities assumed based on their estimated
fair value at the time of the merger. Income of the combined company will not
include income or loss of PageNet prior to the merger. The pro forma condensed
consolidated financial statements reflect preliminary pro forma adjustments made
to combine Arch with PageNet using the purchase method of accounting. The actual
adjustments will be made after the closing and may differ from those reflected
in the pro forma financial statements.

     The pro forma condensed consolidated financial data is for information
purposes only and is not necessarily indicative of the results of future
operations of the combined company or the actual results that would have been
achieved had the merger of Arch and PageNet and Arch's acquisition of
MobileMedia been consummated during the periods indicated. You should read the
unaudited pro forma financial data in conjunction with the consolidated
historical financial statements of Arch, PageNet and MobileMedia, including the
notes to all sets of financial statements.

                                       71
<PAGE>   82

                           ARCH COMMUNICATIONS GROUP

           UNAUDITED PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEETS
                               SEPTEMBER 30, 1999
                                 (IN THOUSANDS)
<TABLE>
<CAPTION>
                                                                                               PRO FORMA
                                                                                              ADJUSTMENTS
                                                                                                  FOR
                                                                                                PAGENET
                                                  PRO FORMA                                     EXCHANGE
                                                 ADJUSTMENTS       ADJUSTED                       AND           ADJUSTED
                                      ARCH         FOR ARCH          ARCH        PAGENET          VAST          PAGE NET
                                  (HISTORICAL)   EXCHANGE(14)     PRO FORMA    (HISTORICAL)   DISTRIBUTION     PRO FORMA
                                  ------------   ------------     ----------   ------------   ------------     ----------
<S>                               <C>            <C>              <C>          <C>            <C>              <C>
ASSETS
Current assets:
 Cash and cash equivalents......   $   21,488                     $   21,488    $  102,961    $   (30,347)(2)  $   72,614
 Accounts receivable, net.......       57,570                         57,570        77,253            (71)(2)      77,182
 Inventories....................       10,163                     10,163....        10,278                         10,278
 Prepaid expenses and other.....        9,959                          9,959        12,983            (15)(2)      12,968
                                   ----------                     ----------    ----------                     ----------
       Total current assets.....       99,180                         99,180       203,475                        173,042
 Property and equipment, net....      409,056                        409,056       783,497           (918)(2)     782,579
 Intangible and other assets....      916,282                        916,282       533,913        (12,884)(2)     517,287
                                                                                                   (3,742)(3)
                                   ----------                     ----------    ----------                     ----------
                                   $1,424,518                     $1,424,518    $1,520,885                     $1,472,908
                                   ==========                     ==========    ==========                     ==========
LIABILITIES AND STOCKHOLDERS'
 EQUITY (DEFICIT)
Current liabilities:
 Current maturities of long-term
   debt.........................   $    3,060                     $    3,060    $       --                     $       --
 Accounts payable...............       23,444                         23,444       109,962             25(2)      109,987
 Accrued expenses...............       51,919    $    5,000(1)        56,919        33,800           (460)(2)      33,340
 Accrued interest...............       31,861                         31,861        38,585        (34,104)(2)       4,481
 Customer deposits and deferred
   revenue......................       41,191                         41,191        38,338           (271)(2)      38,067
 Accrued restructuring, current
   portion......................       18,239                         18,239        12,521                         12,521
                                   ----------                     ----------    ----------                     ----------
       Total current
         liabilities............      169,714                        174,714       233,206                        198,396
 Long-term debt, less current
   maturities...................    1,357,743      (383,631)(1)      957,821     1,999,320     (1,200,000)(2)     799,320
                                                    (16,291)(15)
 Accrued restructuring,
   non-current portion..........                                                    12,783                         12,783
 Other long-term liabilities....       77,953                         77,953                                           --

STOCKHOLDERS' EQUITY (DEFICIT):
 Preferred stock................            3            (3)(1)           --            --                             --
 Common stock...................          481           318(1)           822         1,040          6,168(2)        7,208
                                                         23(15)
 Additional paid-in capital.....      639,559       178,190(1)       827,054       134,161        542,811(2)      673,230
                                                      9,305(15)                                    (3,742)(3)
 Accumulated other comprehensive
   income.......................                                                     1,161                          1,161
 Accumulated deficit............     (820,935)      200,126(1)      (613,846)     (860,786)       641,596(2)     (219,190)
                                                      6,963(1)
                                   ----------                     ----------    ----------                     ----------
       Total stockholders'
         equity (deficit).......     (180,892)                       214,030      (724,424)                       462,409
                                   ----------                     ----------    ----------                     ----------
                                   $1,424,518                     $1,424,518    $1,520,885                     $1,472,908
                                   ==========                     ==========    ==========                     ==========

<CAPTION>

                                   PRO FORMA
                                  ADJUSTMENTS      PRO FORMA
                                  FOR MERGER      CONSOLIDATED
                                  -----------     ------------
<S>                               <C>             <C>
ASSETS
Current assets:
 Cash and cash equivalents......                   $   94,102
 Accounts receivable, net.......                      134,752
 Inventories....................                       20,441
 Prepaid expenses and other.....                       22,927
                                                   ----------
       Total current assets.....                      272,222
 Property and equipment, net....                    1,191,635
 Intangible and other assets....   $ 143,684(4)     1,577,253
                                                   ----------
                                                   $3,041,110
                                                   ==========
LIABILITIES AND STOCKHOLDERS'
 EQUITY (DEFICIT)
Current liabilities:
 Current maturities of long-term
   debt.........................                   $    3,060
 Accounts payable...............                      133,431
 Accrued expenses...............                       90,259
 Accrued interest...............                       36,342
 Customer deposits and deferred
   revenue......................                       79,258
 Accrued restructuring, current
   portion......................      20,000(4)        50,760
                                                   ----------
       Total current
         liabilities............                      393,110
 Long-term debt, less current
   maturities...................      45,000(4)     1,802,141
 Accrued restructuring,
   non-current portion..........                       12,783
 Other long-term liabilities....                       77,953
STOCKHOLDERS' EQUITY (DEFICIT):
 Preferred stock................                           --
 Common stock...................      (6,310)(4)        1,720
 Additional paid-in capital.....    (133,035)(4)    1,367,249
 Accumulated other comprehensive
   income.......................      (1,161)(4)           --
 Accumulated deficit............     219,190(4)      (613,846)
                                                   ----------
       Total stockholders'
         equity (deficit).......                      755,123
                                                   ----------
                                                   $3,041,110
                                                   ==========
</TABLE>

                                       72
<PAGE>   83

                        ARCH COMMUNICATIONS GROUP, INC.

      UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1999
               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                                          PRO FORMA          PRO FORMA
                                                         ADJUSTMENTS        ADJUSTMENTS       ADJUSTED
                           ARCH        MOBILEMEDIA     FOR MOBILEMEDIA        FOR ARCH          ARCH         PAGENET
                       (HISTORICAL)    (HISTORICAL)      ACQUISITION        EXCHANGE(14)      PRO FORMA    (HISTORICAL)
                       ------------   --------------   ----------------     ------------     -----------   ------------
<S>                    <C>            <C>              <C>                  <C>              <C>           <C>
Service, rental and
 maintenance
 revenues............  $   403,607       $167,318        $    (3,521)(5)                     $   567,404   $    696,566
Product sales........       36,963          9,207                                                 46,170         68,969
                       -----------       --------                                            -----------   ------------
   Total revenues....      440,570        176,525                                                613,574        765,535
Cost of products
 sold................      (24,988)        (6,216)                                               (31,204)       (43,013)
                       -----------       --------                                            -----------   ------------
                           415,582        170,309                                                582,370        722,522
Operating expenses:
 Service, rental and
   maintenance.......       91,421         44,530             (3,521)(5)                         132,430        193,705
 Selling.............       57,589         23,115                                                 80,704         70,223
 General and
   administrative....      123,643         51,562                                                175,205        260,877
 Depreciation and
   amortization......      222,836         45,237              2,958(6)                          282,731        268,171
                                                              11,700(6)
 Provision for asset
   impairment........                                                                                            17,798
 Restructuring
   charge............       (2,200)                                                               (2,200)
 Bankruptcy related
   expenses..........                      14,938                                                 14,938
                       -----------       --------                                            -----------   ------------
   Total operating
    expenses.........      493,289        179,382                                                683,808        810,774
                       -----------       --------                                            -----------   ------------
Operating income
 (loss)..............      (77,707)        (9,073)                                              (101,438)       (88,252)
 Interest expense,
   net...............      (98,927)       (17,660)            17,660(7)          29,199(8)       (85,350)      (109,111)
                                                             (16,839)(7)          1,217(15)
 Other income
   (expense).........      (47,596)         1,435                                                (46,161)           806
                       -----------       --------                                            -----------   ------------
Income (loss) before
 income tax
 provisions,
 extraordinary item
 and cumulative
 effect of accounting
 change..............     (224,230)       (25,298)                                              (232,949)      (196,557)
Provision for income
 taxes...............           --            209                                                    209             --
                       -----------       --------                                            -----------   ------------
Income (loss) before
 extraordinary item
 and cumulative
 effect of accounting
 change..............  $  (224,230)      $(25,507)                                           $  (233,158)  $   (196,557)
                       ===========       ========                                            ===========   ============
Basic/diluted income
 (loss) per share
 before extraordinary
 item and cumulative
 effect of accounting
 change(17)..........  $      9.00                                                           $     (2.84)  $      (1.89)
                       ===========                                                           ===========   ============
Weighted average
common shares                                                                31,756,126(1)
outstanding(17)......   25,088,969                        22,971,813(16)      2,327,120(15)   82,144,028    103,960,240

<CAPTION>
                        PRO FORMA
                       ADJUSTMENTS        ADJUSTED       PRO FORMA
                       FOR PAGENET        PAGENET       ADJUSTMENTS       PRO FORMA
                         EXCHANGE        PRO FORMA      FOR MERGER       CONSOLIDATED
                       ------------     ------------   -------------     ------------
<S>                    <C>              <C>            <C>               <C>
Service, rental and
 maintenance
 revenues............  $       (744)(9) $    695,822                     $  1,263,226
Product sales........                         68,969                          115,139
                                        ------------                     ------------
   Total revenues....                        764,791                        1,378,365
Cost of products
 sold................                        (43,013)  $   (1,472)(11)        (75,689)
                                        ------------                     ------------
                                             721,778                        1,302,676
Operating expenses:
 Service, rental and
   maintenance.......            66(9)       193,771                          326,201
 Selling.............                         70,223                          150,927
 General and
   administrative....       (14,034)(9)      246,843                          422,048
 Depreciation and
   amortization......                        268,171      (87,158)(11)       501,482
                                                           37,738(12)
 Provision for asset
   impairment........                         17,798                           17,798
 Restructuring
   charge............                             --                           (2,200)
 Bankruptcy related
   expenses..........                             --                           14,938
                                        ------------                     ------------
   Total operating
    expenses.........                        796,806                        1,431,194
                                        ------------                     ------------
Operating income
 (loss)..............                        (75,028)                        (128,518)
 Interest expense,
   net...............        91,077(10)      (18,034)     (12,436)           (115,820)
 Other income
   (expense).........             3(9)           809                          (45,352)
                                        ------------                     ------------
Income (loss) before
 income tax
 provisions,
 extraordinary item
 and cumulative
 effect of accounting
 change..............                        (92,253)                        (289,690)
Provision for income
 taxes...............                             --                              209
                                        ------------                     ------------
Income (loss) before
 extraordinary item
 and cumulative
 effect of accounting
 change..............                   $    (92,253)                    $   (289,899)
                                        ============                     ============
Basic/diluted income
 (loss) per share
 before extraordinary
 item and cumulative
 effect of accounting
 change(17)..........                   $      (0.13)                    $      (1.69)
                                        ============                     ============
Weighted average
common shares                                           (720,790,997)(4)
outstanding(17)......   616,830,757(1)   720,790,997      89,882,637(4)   172,026,665
</TABLE>

                                       73
<PAGE>   84

                        ARCH COMMUNICATIONS GROUP, INC.

      UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1998
               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                                         PRO FORMA
                                                        ADJUSTMENTS      PRO FORMA                                    PRO FORMA
                                                            FOR         ADJUSTMENTS      ADJUSTED                    ADJUSTMENTS
                               ARCH      MOBILEMEDIA    MOBILEMEDIA       FOR ARCH         ARCH         PAGENET      FOR PAGENET
                           (HISTORICAL)  (HISTORICAL)   ACQUISITION     EXCHANGE(14)     PRO FORMA    (HISTORICAL)     EXCHANGE
                           ------------  ------------  -----------     ------------    -----------   ------------   ------------
<S>                        <C>           <C>           <C>             <C>             <C>           <C>            <C>
Service, rental and
 maintenance revenues....   $ 371,154      $423,059    $   (8,454)(5)                  $   785,759   $    945,524   $        (44)(9)
Product sales............      42,481        26,622                                         69,103        100,503
                            ---------      --------                                    -----------   ------------
   Total revenues........     413,635       449,681                                        854,862      1,046,027
Cost of products sold....     (29,953)      (22,162)                                       (52,115)       (77,672)
                            ---------       --------                                   -----------   ------------
                              383,682       427,519                                        802,747        968,355
Operating expenses:
 Service, rental and
   maintenance...........      80,782       111,589        (8,454)(5)                      183,917        210,480             47(9)
 Selling.................      49,132        61,106                                        110,238        104,350
 General and
   administrative........     112,181       133,003                                        245,184        320,586         (2,721)(9)
 Depreciation and
   amortization..........     221,316       114,903         7,100(6)                       371,399        281,259
                                                           28,080(6)
 Restructuring charge....      14,700            --                                         14,700         74,000
 Bankruptcy related
   expenses..............                     8,163                                          8,163
                            ---------      --------                                    -----------   ------------
   Total operating
    expenses.............     478,111       428,764                                        933,601        990,675
                            ---------      --------                                    -----------   ------------
Operating income
 (loss)..................     (94,429)       (1,245)                                      (130,854)       (22,320)
 Interest expense, net...    (104,213)      (53,043)       53,043(7)       35,494(8)      (107,652)      (141,692)       121,435(10)
                                                          (40,413)(7)       1,480(15)
 Gain on sale of
   assets................          --        94,165                                         94,165             --
 Other income (expense)..      (5,689)         (338)                                        (6,027)         2,003
                            ---------      --------                                    -----------   ------------
Income (loss) before
 income tax provisions
 and extraordinary
 item....................    (204,331)       39,539                                       (150,368)      (162,009)
Provision for income
 taxes...................          --         3,958                                          3,958             --
                            ---------      --------                                    -----------   ------------
Income (loss) before
 extraordinary item......   $(204,331)     $ 35,581                                    $  (154,326)  $   (162,009)
                            =========      ========                                    ===========   ============
Basic/diluted income
 (loss) before
 extraordinary
 item(17)................   $  (29.34)                                                 $     (1.88)  $      (1.57)
                            =========                                                  ===========   ============
Weighted average common                                                31,756,126(1)
shares outstanding(17)...   6,997,730                  40,988,922(16)   2,327,120(15)   82,069,898    103,377,424    616,830,757(2)

<CAPTION>

                             ADJUSTED      PRO FORMA
                             PAGENET      ADJUSTMENTS       PRO FORMA
                            PRO FORMA      FOR MERGER      CONSOLIDATED
                           ------------   ------------     ------------
<S>                        <C>            <C>              <C>
Service, rental and
 maintenance revenues....  $    945,480                    $  1,731,239
Product sales............       100,503                         169,606
                           ------------                    ------------
   Total revenues........     1,045,983                       1,900,845
Cost of products sold....       (77,672)                       (129,787)
                           ------------                    ------------
                                968,311                       1,771,058
Operating expenses:
 Service, rental and
   maintenance...........       210,527                         394,444
 Selling.................       104,350                         214,588
 General and
   administrative........       317,865                         563,049
 Depreciation and
   amortization..........       281,259         44,679(12)      697,337
 Restructuring charge....        74,000                          88,700
 Bankruptcy related
   expenses..............            --                           8,163
                           ------------                    ------------
   Total operating
    expenses.............       988,001                       1,966,281
                           ------------                    ------------
Operating income
 (loss)..................       (19,690)                       (193,223)
 Interest expense, net...       (20,257)       (20,654)(13)    (148,563)
 Gain on sale of
   assets................            --                          94,165
 Other income (expense)..         2,003                          (4,024)
                           ------------                    ------------
Income (loss) before
 income tax provisions
 and extraordinary
 item....................       (37,944)                       (253,645)
Provision for income
 taxes...................            --                           3,958
                           ------------                    ------------
Income (loss) before
 extraordinary item......  $    (37,944)                   $   (257,603)
                           ============                    ============
Basic/diluted income
 (loss) before
 extraordinary
 item(17)................  $      (0.05)                   $      (1.50)
                           ============                    ============
Weighted average common                   (720,208,181)(4)
shares outstanding(17)...   720,208,181     89,882,637(4)   171,952,535
</TABLE>

                                       74
<PAGE>   85

              NOTES TO UNAUDITED PRO FORMA CONDENSED CONSOLIDATED
                              FINANCIAL STATEMENTS

     1) To record:

        - the issuance of 29,651,984 shares of Arch common stock valued at $6.02
          per share in exchange for $383.6 million (accreted value, representing
          $448.4 million of principal amount) of Arch discount notes. The value
          of Arch discount notes used in the preparation of these pro forma
          financial statements reflect the value of discount notes remaining
          after giving effect to the October 1999 exchanges of debt for equity
          referred to in note 15 of the notes to the unaudited pro forma
          condensed consolidated financial statements. The conversion of the
          Arch discount notes will result in an extraordinary gain from the
          early extinguishment of debt of $200.1 million, net of tax; and

        - the conversion of 250,000 shares of Arch convertible preferred stock
          into 2,104,142 shares of Arch common stock.

     2) To record the issuance of 616,830,757 shares of PageNet common stock
        valued at $0.89 per share and 13,780,000 shares of Vast Class B common
        stock in exchange for $1.2 billion principal amount of PageNet senior
        subordinated notes plus accrued interest:

        - This adjustment includes the elimination of all $24.1 million of
          accrued interest on PageNet's senior subordinated notes and the
          write-off of $21.3 million of deferred financing costs associated with
          PageNet's senior subordinated notes.

        - The conversion of the PageNet senior subordinated notes would result
          in an extraordinary gain from the early extinguishment of debt of
          $641.6 million. There is no provision for income taxes on this gain as
          PageNet expects to have sufficient net operating loss carryforwards
          (which have been fully reserved in PageNet's financial statements)
          available at the time of the exchange to fully offset the gain.

        - This adjustment also includes the elimination of all consolidated
          amounts related to Vast and the recording of PageNet's net investment
          in Vast as a component of intangible and other assets following the
          reduction of PageNet's ownership of Vast to below 50%.

        - PageNet will not exchange the shares of its common stock and the
          common stock of Vast for the senior subordinated notes unless the
          merger with Arch is approved. The adjusted PageNet pro forma balance
          sheet column included in the unaudited pro forma condensed
          consolidated financial statements is an intermediate step in the
          overall merger transaction. Holders of the PageNet senior subordinated
          notes cannot elect to exchange their notes if the merger is not
          consummated and therefore cannot own an equity interest in the pro
          forma company set forth in the adjusted PageNet Pro Forma balance
          sheet column.

     3) To record the distribution of 2,320,000 shares of Vast Class B common
        stock to the current stockholders of PageNet.

     4) To record:

        - the issuance of 89,882,637 shares of Arch common stock to the
          stockholders of PageNet, including the stockholders who previously
          held the PageNet senior subordinated notes converted to PageNet common
          stock as discussed in note 1 of the notes to the unaudited pro forma
          condensed consolidated financial statements above. Each outstanding
          share of PageNet common stock will be converted into 0.1247 shares of
          Arch common stock;

        - the elimination of $8.8 million in deferred financing costs related to
          PageNet's domestic revolving credit agreement which Arch will not
          assume as part of this transaction; and

        - the excess of purchase price over the assumed fair value of the
          identifiable assets required.

                                       75
<PAGE>   86

     The historical book value of the tangible and intangible assets of PageNet
was assumed to approximate fair value. The excess of purchase prices over the
assumed fair value of identifiable assets acquired was calculated as follows (in
thousands):

<TABLE>
<S>                                                           <C>
Consideration Exchanged:
  Fair value of shares issued to PageNet stockholders
     (89,882,637 shares at $6.02 per share).................  $  541,093
Liabilities Assumed:
  Bank debt.................................................     745,000
  Other long-term debt......................................      54,320
  Accounts payable..........................................     109,987
  Accrued expenses..........................................      33,340
  Accrued interest..........................................       4,481
  Accrued restructuring.....................................      25,304
  Customer deposits and deferred revenue....................      38,067
  PageNet closing costs.....................................      20,000(a)
                                                              ----------
Total consideration exchanged...............................   1,571,592
Transaction costs...........................................      25,000(b)
Restructuring reserve.......................................      20,000(c)
                                                              ----------
Total purchase price........................................   1,616,561
Less fair value of tangible and intangible net assets
  acquired..................................................   1,464,084
                                                              ----------
Excess of purchase price over tangible and intangible net
  assets acquired...........................................  $  152,508
                                                              ==========
</TABLE>

          (a) PageNet closing costs consist primarily of investment banking,
     financing and other costs which will be paid to PageNet's financial
     advisors by Arch at the time of closing.

          (b) Transaction costs include legal, investment banking, financing,
     accounting and other costs incurred by Arch to consummate the PageNet
     merger.

          (c) Restructuring reserve consists of severance costs related
     primarily to duplicative general and administrative functions at the
     corporate, regional and market levels of PageNet, such as technical,
     marketing, finance, and other support functions to be recorded in
     accordance with Emerging Issue Task Force Consensus 95-3. These
     terminations will occur as operations of PageNet are integrated into those
     of Arch and are based on management's preliminary review of synergies that
     exist between the two companies. The analysis is expected to be finalized
     after consummation of the PageNet acquisition and may result in additional
     amounts to be reserved.

     5) To eliminate revenues and expenses between Arch and MobileMedia.
Revenues and expenses between Arch and PageNet were not material in 1998 or
1999.

     6) To record amortization on the excess of purchase price over the tangible
and intangible assets in the MobileMedia acquisition on a straight-line basis in
the amount of $7.1 million for the year ended December 31, 1998 and $3.0 million
for the period ended June 3, 1999, the closing date of the MobileMedia
acquisition. The amortization relates to $400.7 million assumed fair value of
intangible assets, consisting primarily of customer lists with an assumed fair
value of $239.7 million and FCC licenses with an assumed fair value of $143.0
million. The MobileMedia historical amortization was adjusted by $28.1 million
for the year ended December 31, 1998 and by $11.7 million for the period ended
June 3, 1999, the closing date of the MobileMedia acquisition, to conform
MobileMedia's 25 year estimated useful life for FCC licenses to Arch's 10 year
estimated useful life and to conform MobileMedia's 2 year estimated useful life
for acquired customer lists to Arch's 5 year estimated useful life.

                                       76
<PAGE>   87

     7) To remove the interest expense associated with the various MobileMedia
credit facilities and notes eliminated as a result of its insolvency proceedings
and to record the interest associated with Arch's additional borrowings to
finance the MobileMedia acquisition. Interest was calculated using an 11% rate
on $181.0 million of bank borrowings and a 14.75% rate on $139.0 million senior
discount notes.

     8) To remove the interest expense associated with Arch's discount notes
which will be converted into common stock in connection with the Arch exchange.

     9) To remove the operating results of Vast, which will be spun off as part
of the overall transaction involving Arch and PageNet. This adjustment removes
only the direct expenses of Vast, as no expenses allocated to Vast by PageNet
were assumed to be eliminated as a result of the spinoff.

     10) To remove the interest expense associated with PageNet's senior
subordinated notes which will be converted into common stock as part of the
PageNet exchange as well as the amortization of PageNet's deferred financing
costs which are included in interest expense.

     11) To adjust PageNet's 1999 cost of sales and depreciation to be
consistent with Arch's pager useful life of three years per unit.

     12) To record amortization of the excess of purchase price over the
tangible and intangible assets in the PageNet acquisition on a straight-line
basis in the amount of $15.3 million for the year ended December 31, 1998 and
$11.4 million for the nine month period ended September 30, 1999. The actual
amortization recorded after consummation of the PageNet transaction may differ
from these amounts due to the full allocation of purchase price to assets and
liabilities assumed pursuant to AFB No. 16. The amortization relates to $454.9
million assumed fair value of intangible assets consisting primarily of FCC
licenses with an assumed fair value of $429.3 million and goodwill with an
assumed fair value of $25.6 million. PageNet's historical amortization was
adjusted by $29.4 million for the year ended December 31, 1998 and by $26.3
million for the nine month period September 30, 1999 to conform PageNet's 40
year estimated useful life of FCC licenses and goodwill to Arch's 10 year
estimated useful life.

     13) To record additional interest expense on pro forma consolidated bank
debt. Interest was calculated assuming a 10% interest rate on the average bank
debt outstanding for the year ended December 31, 1998 and the nine month period
ended September 30, 1999. Additional interest expense on bank borrowings would
be as follows if interest rates were to increase or decrease by 1/8 of a percent
(in thousands):

<TABLE>
<CAPTION>
                                                             ASSUMED INTEREST EXPENSES
                                                       --------------------------------------
                                                          YEAR ENDED       NINE MONTHS ENDED
           ASSUMED CHANGE IN INTEREST RATE             DECEMBER 31, 1998   SEPTEMBER 30, 1999
           -------------------------------             -----------------   ------------------
<S>                                                    <C>                 <C>
Increase of  1/8%....................................       $21,676             $13,487
Decrease of  1/8%....................................        19,633              11,384
</TABLE>

     14) The pro forma financial statements of Arch assume 100% conversion of
Arch's $383.6 million (accreted value) discount notes. The following table
illustrates the impact on Arch's pro forma financial statements in the event
that no discount noteholder or only 50% of discount noteholders elect(s) to
convert their discount notes into Arch common stock (in thousands, except per
share amounts):

<TABLE>
<CAPTION>
                                                                ASSUMING        ASSUMING
                                                                   0%              50%
                                                              DISCOUNT NOTE   DISCOUNT NOTE
                                                               CONVERSION      CONVERSION
                                                              -------------   -------------
<S>                                                           <C>             <C>
Total long-term debt, less current maturities...............   $2,185,772      $1,993,957
Stockholders' equity........................................      376,491         565,807
Interest expense, net:
  Year ended December 31, 1998..............................     (184,057)       (166,310)
  Nine months ended September 30, 1999......................     (145,020)       (130,420)
</TABLE>

                                       77
<PAGE>   88

<TABLE>
<CAPTION>
                                                                ASSUMING        ASSUMING
                                                                   0%              50%
                                                              DISCOUNT NOTE   DISCOUNT NOTE
                                                               CONVERSION      CONVERSION
                                                              -------------   -------------
<S>                                                           <C>             <C>
Income (loss) before extraordinary item and cumulative
effect of accounting change:
  Year ended December 31, 1998..............................     (293,097)       (275,350)
  Nine months ended September 30, 1999......................     (319,099)       (304,499)
Basic/diluted income (loss) per common share before
  extraordinary item and cumulative effect of accounting
  change:
  Year ended December 31, 1998..............................   $    (2.06)     $    (1.75)
  Nine months ended September 30, 1999......................   $    (2.24)     $    (1.94)
</TABLE>

     15) To record the repurchase of $16.3 million accreted value of discount
notes by Arch during October 1999 in exchange for 2,327,120 shares of Arch
common stock and to adjust the related interest expense for the notes
repurchased. In October 1999, Arch completed transactions with two senior
discount noteholders in which Arch issued 2,327,120 shares of Arch common stock
in exchange for $16.3 million accreted value ($19.0 million maturity value) of
discount notes. The conversion of the discount notes resulted in a gain from the
early extinguishment of debt of $7.0 million.

     16) To record issuance of Arch common stock in conjunction with the
MobileMedia acquisition.

     17) All share information reflects a 1-for-3 reverse stock split effected
by Arch during June 1999.

                                       78
<PAGE>   89

     SELECTED HISTORICAL CONSOLIDATED FINANCIAL AND OPERATING DATA -- ARCH

     The following table sets forth selected historical consolidated financial
and operating data of Arch for the year ended August 31, 1994, the four months
ended December 31, 1993 and 1994, each of the five years ended December 31, 1998
and the nine months ended September 30, 1998 and 1999. The selected financial
and operating data as of December 31, 1995, 1996, 1997 and 1998 and for each of
the four years ended December 31, 1998 have been derived from Arch's audited
consolidated financial statements and notes. The selected financial and
operating data for the year ended December 31, 1994 has been derived from the
audited financial statements for the year ended August 31, 1994, the four month
period ended December 31, 1994 and the unaudited financial statements for the
four month period ended December 31, 1993. The selected financial and operating
data as of September 30, 1999 and for the nine months ended September 30, 1998
and 1999 have been derived from Arch's unaudited consolidated financial
statements and notes. You should read the following consolidated financial
information in conjunction with "Arch Management's Discussion and Analysis of
Financial Condition and Results of Operations" and Arch's consolidated financial
statements and notes set forth below.

     During 1994, Arch changed its fiscal year end from August 31 to December
31. Arch was required to file a transition report on Form 10-K with audited
financial statements for the period September 1, 1994 through December 31, 1994
and has elected to include in the following table, for comparative purposes,
unaudited financial statements for the periods September 1, 1993 through
December 31, 1993 and January 1, 1994 through December 31, 1994.

     In the following table, equity in loss of affiliate represents Arch's share
of net losses of USA Mobile Communications Holdings, Inc. for the period of time
from Arch's acquisition of its initial 37% interest in USA Mobile on May 16,
1995 through the completion of Arch's acquisition of USA Mobile on September 7,
1995 and Arch's share of net losses of Benbow PCS Ventures, Inc. since Arch's
acquisition of Westlink Holdings, Inc. in May 1996. See "Arch Management's
Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources".

     The extraordinary item is an extraordinary charge resulting from prepayment
of indebtedness. See "Arch Management's Discussion and Analysis of Financial
Condition and Results of Operations -- Results of Operations".

     Adjusted EBITDA, as determined by Arch, does not reflect restructuring
charge, equity in loss of affiliate, and extraordinary items; consequently
adjusted EBITDA may not necessarily be comparable to similarly titled data of
other wireless communications companies. EBITDA is commonly used by analysts and
investors as a principal measure of financial performance in the wireless
communications industry. EBITDA is also one of the primary financial measures
used to calculate whether Arch and its subsidiaries are in compliance with
financial covenants under their debt agreements. These covenants, among other
things, limit the ability of Arch and its subsidiaries to: incur additional
indebtedness, make investments, pay dividends, grant liens on its assets, merge,
sell or acquire assets, repurchase or redeem capital stock, incur capital
expenditures and prepay certain indebtedness. EBITDA is also one of the
financial measures used by analysts to value Arch. Therefore Arch management
believes that the presentation of EBITDA provides relevant information to
investors. EBITDA should not be construed as an alternative to operating income
or cash flows from operating activities as determined in accordance with GAAP or
as a measure of liquidity. Amounts reflected as EBITDA or adjusted EBITDA are
not necessarily available for discretionary use as a result of restrictions
imposed by the terms of existing indebtedness and limitations imposed by
applicable law upon the payment of dividends or distributions, among other
things. See "Arch Management's Discussion and Analysis of Financial Condition
and Results of Operation".

     Adjusted EBITDA margin is calculated by dividing Arch's adjusted EBITDA by
total revenues less cost of products sold. EBITDA margin is a measure commonly
used in the wireless communications industry to evaluate a company's EBITDA
relative to total revenues less cost of products sold as an indicator of the
efficiency of a company's operating structure.

                                       79
<PAGE>   90
<TABLE>
<CAPTION>
                                              FOUR MONTHS
                                                 ENDED
                            YEAR ENDED        DECEMBER 31,                          YEAR ENDED DECEMBER 31,
                            AUGUST 31,   ----------------------   ------------------------------------------------------------
                               1994         1993         1994       1994        1995         1996         1997         1998
                            ----------   -----------   --------   --------   ----------   ----------   ----------   ----------
                                              (UNAUDITED)                            (DOLLARS IN THOUSANDS)
<S>                         <C>          <C>           <C>        <C>        <C>          <C>          <C>          <C>
STATEMENTS OF OPERATIONS
DATA:
Service, rental and
  maintenance revenues....   $ 55,139     $ 16,457     $ 22,847   $ 61,529   $  138,466   $  291,399   $  351,944   $  371,154
Product sales.............     12,108        2,912        5,178     14,374       24,132       39,971       44,897       42,481
                             --------     --------     --------   --------   ----------   ----------   ----------   ----------
Total revenues............     67,247       19,369       28,025     75,903      162,598      331,370      396,841      413,635
Cost of products sold.....    (10,124)      (2,027)      (4,690)   (12,787)     (20,789)     (27,469)     (29,158)     (29,953)
                             --------     --------     --------   --------   ----------   ----------   ----------   ----------
                               57,123       17,342       23,335     63,116      141,809      303,901      367,683      383,682
Operating expenses:
  Service, rental and
    maintenance...........     13,123        3,959        5,231     14,395       29,673       64,957       79,836       80,782
  Selling.................     10,243        3,058        4,338     11,523       24,502       46,962       51,474       49,132
  General and
    Administrative........     17,717        5,510        7,022     19,229       40,448       86,181      106,041      112,181
  Depreciation and
    Amortization..........     16,997        5,549        6,873     18,321       60,205      191,871      232,347      221,316
  Restructuring charge....         --           --           --         --           --           --           --       14,700
                             --------     --------     --------   --------   ----------   ----------   ----------   ----------
Operating income (loss)...       (957)        (734)        (129)      (352)     (13,019)     (86,070)    (102,015)     (94,429)
Interest and non-operating
  Expenses, net...........     (4,112)      (1,132)      (1,993)    (4,973)     (22,522)     (75,927)     (97,159)    (104,213)
Equity in loss of
  affiliate...............         --           --           --         --       (3,977)      (1,968)      (3,872)      (5,689)
                             --------     --------     --------   --------   ----------   ----------   ----------   ----------
Income (loss) before
  income tax benefit,
  extraordinary item and
  accounting change.......     (5,069)      (1,866)      (2,122)    (5,325)     (39,518)    (163,965)    (203,046)    (204,331)
Income tax benefit........         --           --           --         --        4,600       51,207       21,172           --
                             --------     --------     --------   --------   ----------   ----------   ----------   ----------
Income (loss) before
  extraordinary item and
  accounting change.......     (5,069)      (1,866)      (2,122)    (5,325)     (34,918)    (112,758)    (181,874)    (204,331)
Extraordinary item........         --           --       (1,137)    (1,137)      (1,684)      (1,904)          --       (1,720)
Cumulative effect of
  accounting change.......         --           --           --         --           --           --           --           --
                             --------     --------     --------   --------   ----------   ----------   ----------   ----------
Net income (loss).........   $ (5,069)    $ (1,866)    $ (3,259)  $ (6,462)  $  (36,602)  $ (114,662)  $ (181,874)  $ (206,051)
                             ========     ========     ========   ========   ==========   ==========   ==========   ==========
Basic/diluted income
  (loss) per common share
  before extraordinary
  item and accounting
  change..................   $  (2.13)    $  (0.78)    $  (0.88)  $  (2.23)  $    (7.79)  $   (16.59)  $   (26.31)  $   (29.34)
Extraordinary item per
  basic/diluted common
  share...................         --           --        (0.47)     (0.47)       (0.37)       (0.27)          --        (0.24)
Cumulative effect of
  accounting change per
  basic/diluted common
  share...................         --           --           --         --           --           --           --           --
                             --------     --------     --------   --------   ----------   ----------   ----------   ----------
Basic/diluted net income
  (loss) per common
  share...................   $  (2.13)    $  (0.78)    $  (1.35)  $  (2.70)  $    (8.16)  $   (16.86)  $   (26.31)  $   (29.58)
                             ========     ========     ========   ========   ==========   ==========   ==========   ==========
OTHER OPERATING DATA:
Adjusted EBITDA...........   $ 16,040     $  4,815     $  6,744   $ 17,969   $   47,186   $  105,801   $  130,332   $  141,587
Adjusted EBITDA margin....         28%          28%          29%        28%          33%          35%          35%          37%
Capital expenditures,
  excluding
  acquisitions............   $ 25,657     $  7,486     $ 15,279   $ 33,450   $   60,468   $  165,206   $  102,769   $  113,184
Cash flows provided by
  operating activities....   $ 14,781     $  5,306     $  4,680   $ 14,155   $   14,749   $   37,802   $   63,590   $   81,105
Cash flows used in
  investing activities....   $(28,982)    $ (7,486)    $(34,364)  $(55,860)  $ (192,549)  $ (490,626)  $ (102,769)  $  (82,868)
Cash flows provided by
  (used in) financing
  activities..............   $ 14,636     $ 11,290     $ 26,108   $ 29,454   $  179,092   $  452,678   $   39,010   $       68
Units in service at end of
  period..................    410,000      288,000      538,000    538,000    2,006,000    3,295,000    3,890,000    4,276,000

<CAPTION>
                                  NINE MONTHS
                                     ENDED
                                 SEPTEMBER 30,
                            -----------------------
                               1998         1999
                            ----------   ----------
                                  (UNAUDITED)
<S>                         <C>          <C>
STATEMENTS OF OPERATIONS
DATA:
Service, rental and
  maintenance revenues....  $  277,826   $  403,607
Product sales.............      31,811       36,963
                            ----------   ----------
Total revenues............     309,637      440,570
Cost of products sold.....     (21,863)     (24,988)
                            ----------   ----------
                               287,774      415,582
Operating expenses:
  Service, rental and
    maintenance...........      60,812       91,421
  Selling.................      36,902       57,589
  General and
    Administrative........      84,527      123,643
  Depreciation and
    Amortization..........     164,990      222,836
  Restructuring charge....      14,700       (2,200)
                            ----------   ----------
Operating income (loss)...     (74,157)     (77,707)
Interest and non-operating
  Expenses, net...........     (78,334)    (143,323)
Equity in loss of
  affiliate...............      (2,219)      (3,200)
                            ----------   ----------
Income (loss) before
  income tax benefit,
  extraordinary item and
  accounting change.......    (154,710)    (224,230)
Income tax benefit........          --           --
                            ----------   ----------
Income (loss) before
  extraordinary item and
  accounting change.......    (154,710)    (224,230)
Extraordinary item........      (1,720)          --
Cumulative effect of
  accounting change.......          --       (3,361)
                            ----------   ----------
Net income (loss).........  $ (156,430)  $ (227,591)
                            ==========   ==========
Basic/diluted income
  (loss) per common share
  before extraordinary
  item and accounting
  change..................  $   (22.20)  $    (9.00)
Extraordinary item per
  basic/diluted common
  share...................       (0.25)          --
Cumulative effect of
  accounting change per
  basic/diluted common
  share...................          --        (0.13)
                            ----------   ----------
Basic/diluted net income
  (loss) per common
  share...................  $   (22.45)  $    (9.13)
                            ==========   ==========
OTHER OPERATING DATA:
Adjusted EBITDA...........  $  105,533   $  142,929
Adjusted EBITDA margin....          37%          34%
Capital expenditures,
  excluding
  acquisitions............  $   85,785   $   83,186
Cash flows provided by
  operating activities....  $   61,276   $   76,422
Cash flows used in
  investing activities....  $  (55,646)  $ (598,869)
Cash flows provided by
  (used in) financing
  activities..............  $   (2,387)  $  542,302
Units in service at end of
  period..................   4,211,000    7,024,000
</TABLE>

                                       80
<PAGE>   91

<TABLE>
<CAPTION>
                                       AS OF
                                     AUGUST 31,                      AS OF DECEMBER 31,
                                     ----------   ---------------------------------------------------------   AS OF SEPTEMBER 30,
                                        1994        1994      1995        1996         1997         1998             1999
                                     ----------   --------   -------   ----------   ----------   ----------   -------------------
BALANCE SHEET DATA:                                                                                               (UNAUDITED)
<S>                                  <C>          <C>        <C>       <C>          <C>          <C>          <C>
Current assets.....................    $6,751     $  8,483   $33,671   $   43,611   $   51,025   $   50,712       $   99,180
Total assets.......................    76,255      117,858   785,376    1,146,756    1,020,720      904,285        1,424,518
Long-term debt, less current
  maturities.......................    67,328       93,420   457,044      918,150      968,896    1,003,499        1,357,743
Redeemable preferred stock.........        --           --     3,376        3,712           --           --               --
Stockholders' equity (deficit).....    (3,304)       9,368   246,884      147,851      (33,255)    (213,463)        (180,892)
</TABLE>

     The following table reconciles net income to the presentation of Arch's
adjusted EBITDA:
<TABLE>
<CAPTION>
                                                      FOUR MONTHS
                                        AS OF            ENDED
                                      AUGUST 31,     DECEMBER 31,                      YEAR ENDED DECEMBER 31,
                                      ----------   -----------------   --------------------------------------------------------
                                         1994       1993      1994      1994       1995         1996        1997        1998
                                      ----------   -------   -------   -------   ---------   ----------   ---------   ---------
                                                                                 (DOLLARS IN THOUSANDS)
<S>                                   <C>          <C>       <C>       <C>       <C>         <C>          <C>         <C>
Net income (loss)...................   $(5,069)    $(1,866)  $(3,259)  $(6,462)  $(36,602)   $(114,662)   $(181,874)  $(206,051)
Interest and non-operating expenses,
  net...............................     4,112       1,132     1,993     4,973     22,522       75,927       97,159     104,213
Income tax benefit..................        --          --        --        --     (4,600)     (51,207)     (21,172)         --
Depreciation and amortization.......    16,997       5,549     6,873    18,321     60,205      191,871      232,347     221,316
Restructuring charge................        --          --        --        --         --           --           --      14,700
Equity in loss of affiliate.........        --          --        --        --      3,977        1,968        3,872       5,689
Extraordinary Item..................        --          --     1,137     1,137      1,684        1,904           --       1,720
Cumulative effect of accounting
  charge............................        --          --        --        --         --           --           --          --
                                       -------     -------   -------   -------   --------    ---------    ---------   ---------
Adjusted EBITDA.....................   $16,040     $ 4,815   $ 6,744   $17,969   $ 47,186    $ 105,801    $ 130,332   $ 141,587
                                       =======     =======   =======   =======   ========    =========    =========   =========

<CAPTION>
                                           NINE MONTHS
                                              ENDED
                                          SEPTEMBER 30,
                                      ---------------------
                                        1998        1999
                                      ---------   ---------
                                           (UNAUDITED)
<S>                                   <C>         <C>
Net income (loss)...................  $(156,430)  $(227,591)
Interest and non-operating expenses,
  net...............................     78,334     143,323
Income tax benefit..................         --          --
Depreciation and amortization.......    164,990     222,836
Restructuring charge................     14,700      (2,200)
Equity in loss of affiliate.........      2,219       3,200
Extraordinary Item..................      1,720          --
Cumulative effect of accounting
  charge............................         --       3,361
                                      ---------   ---------
Adjusted EBITDA.....................  $ 105,533   $ 142,929
                                      =========   =========
</TABLE>

                                       81
<PAGE>   92

                  ARCH MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

OVERVIEW

     You should read the following discussion and analysis in conjunction with
Arch's consolidated financial statements and notes. This discussion and analysis
addresses Arch both before and after its acquisition of MobileMedia. For
MobileMedia's previous operations under separate ownership and management, see
"MobileMedia Management's Discussion and Analysis of Financial Condition and
Results of Operations".

     Arch derives most of its revenues from fixed monthly or other periodic fees
charged to subscribers for wireless communications services. Such fees are not
dependent on usage. As long as a subscriber remains on service, operating
results benefit from the recurring payments of the fixed periodic fees without
incurrence of additional selling expenses by Arch. Arch's service, rental and
maintenance revenues and the related expenses exhibit substantially similar
growth trends. Arch's average revenue per subscriber has declined over the last
three years for two principal reasons:

     - an increase in the number of reseller customers who purchase airtime at
       wholesale rates; and

     - an increase in the number of subscriber owned and reseller owned units
       for which Arch receives no recurring equipment revenue.

     The reduction in average revenue per subscriber resulting from these trends
has been more than offset by the elimination of associated expenses so that
Arch's margins have improved over this period. Furthermore, recent data
indicates that the rate of decline in revenue per customer has slowed.

     Arch has achieved significant growth in units in service, revenues and
adjusted EBITDA through a combination of internal growth and acquisitions. From
January 1, 1996 through March 31, 1999, Arch's total number of units in service
grew from 2.0 million to 4.3 million units. The MobileMedia acquisition added
another 2.8 million units on June 3, 1999. Arch's total revenues increased from
$331.4 million in the year ended December 31, 1996 to $396.8 million in the year
ended December 31, 1997, to $413.6 million in the year ended December 31, 1998
and $440.6 million in the nine months ended September 30, 1999. Over the same
periods, through operating efficiencies and economies of scale, Arch has been
able to reduce its per unit operating costs to enhance its competitive position
in its markets. Due to the rapid growth in its subscriber base, Arch has
incurred significant selling expenses, which are charged to operations in the
period incurred. Arch had net losses of $114.7 million in the year ended
December 31, 1996, $181.9 million in the year ended December 31, 1997, $206.1
million in the year ended December 31, 1998 and $227.6 million in the nine
months ended September 30, 1999, as a result of significant depreciation and
amortization expenses related to acquired and developed assets and interest
charges associated with indebtedness. However, as its subscriber base has grown,
Arch's operating results have improved, as evidenced by an increase in Arch's
adjusted EBITDA from $105.8 million in the year ended December 31, 1996 to
$130.3 million in the year ended December 31, 1997 to $141.6 million in the year
ended December 31, 1998 and to $190.6 million on an annualized basis in the nine
months ended September 30, 1999.

     EBITDA is a commonly used measure of financial performance in the wireless
communications industry. Adjusted EBITDA is also one of the financial measures
used to calculate whether Arch and its subsidiaries are in compliance with the
financial covenants under their debt agreements. Adjusted EBITDA should not be
construed as an alternative to operating income or cash flows from operating
activities as determined in accordance with GAAP. One of Arch's financial
objectives is to increase its adjusted EBITDA, since this is a significant
source of funds for servicing indebtedness and for investment in continued
growth, including purchase of units and messaging system equipment, construction
and expansion of messaging systems, and possible acquisitions. Adjusted EBITDA,
as determined by Arch, may not necessarily be comparable to similarly titled
data of other wireless communications companies. Amounts reflected as adjusted
EBITDA are not necessarily available for discretionary use as a result of

                                       82
<PAGE>   93

restrictions imposed by the terms of existing or future indebtedness, including
the repayment of such indebtedness or the payment of associated interest,
limitations imposed by applicable law upon the payment of dividends or
distributions or capital expenditure requirements.

DIVISIONAL REORGANIZATION

     To reduce redundancy and take advantage of various operating efficiencies,
Arch is reorganizing its operating divisions over a period which was originally
expected to take 18 to 24 months. Arch has consolidated its former Midwest,
Western, and Northern divisions into existing operating divisions, and is in the
process of consolidating regional administrative support functions, such as
customer service, collections, inventory and billing. Upon completion of the
MobileMedia acquisition, Arch management reviewed the timing and implementation
of the divisional reorganization. After reviewing the divisional reorganization
plan within the context of the combined company integration plan which was
approved by Arch in the third quarter of 1999, management decided that
significant changes needed to be made. Arch anticipates that the impact of the
MobileMedia acquisition will extend the timing for making cash outlays under the
divisional reorganization plan to December 31, 2000.

     In connection with the divisional reorganization as initially implemented,
Arch (1) anticipated a net reduction of approximately 10% of its workforce, (2)
closed certain office locations and redeployed other real estate assets and (3)
recorded a restructuring charge of $14.7 million during 1998. The restructuring
charge consisted of approximately $9.7 million for employee severance, $3.5
million for lease obligations and terminations and $1.5 million of other costs.
The severance costs and lease obligations require cash outlays throughout the
restructuring period. Arch is funding these cash outlays from operations and its
secured credit facility. The divisional reorganization has recently been
reevaluated in light of the MobileMedia merger. In the quarter ended September
30, 1999 Arch identified more facilities and network leases that will not be
utilized following the merger integration, resulting in an additional charge of
$2.6 million. This charge was more than offset by reductions to previously
provided severance and other costs of $4.8 million. There can be no assurance
that the desired cost savings will be achieved or that the anticipated
reorganization of Arch's business will be accomplished smoothly, expeditiously
or successfully.

                                       83
<PAGE>   94

RESULTS OF OPERATIONS

     The following table presents selected items from Arch's consolidated
statements of operations as a percentage of net revenues and certain other
information for the periods indicated. Net revenues are total revenues less cost
of products sold. MobileMedia's results are reflected in Arch's results
beginning on June 3, 1999.

<TABLE>
<CAPTION>
                                             YEAR ENDED                      NINE MONTHS
                                            DECEMBER 31,                 ENDED SEPTEMBER 30,
                                 ----------------------------------    -----------------------
                                   1996         1997         1998        1998          1999
                                 ---------    ---------    --------    ---------    ----------
<S>                              <C>          <C>          <C>         <C>          <C>
Total revenues.................      109.0%       107.9%      107.8%       107.6%        106.0%
Cost of products sold..........       (9.0)        (7.9)       (7.8)        (7.6)         (6.0)
                                 ---------    ---------    --------    ---------    ----------
Net revenues...................      100.0        100.0       100.0        100.0         100.0
Operating expenses:
Service, rental and
  maintenance..................       21.4         21.7        21.1         21.1          22.0
Selling........................       15.4         14.0        12.8         12.8          13.8
General and administrative.....       28.4         29.1        29.2         29.4          29.8
Depreciation and
  amortization.................       63.1         63.2        57.7         57.3          53.6
Restructuring charge...........         --           --         3.8          5.1          (0.5)
                                 ---------    ---------    --------    ---------    ----------
Operating income (loss)........      (28.3)%      (27.7)%     (24.6)%      (25.7)%       (18.7)%
                                 =========    =========    ========    =========    ==========
Net income (loss)..............      (37.7)%      (49.5)%     (53.7)%      (54.4)%       (54.8)%
                                 =========    =========    ========    =========    ==========
Arch adjusted EBITDA...........       34.8%        35.4%       36.9%        36.7%         34.4%
                                 =========    =========    ========    =========    ==========
Cash flows provided by
  operating activities.........  $  37,802    $  63,590    $ 81,105    $  61,276    $   76,422
Cash flows used in investing
  activities...................  $(490,626)   $(102,769)   $(82,868)   $ (55,646)   $ (598,869)
Cash flows provided by (used
  for) financing activities....  $ 452,678    $  39,010    $     68    $  (2,387)   $  542,302
Annual service, rental and
  maintenance expenses per
  unit.........................  $      25    $      22    $     20    $      20    $       22
</TABLE>

RESULTS OF OPERATIONS

  Nine Months Ended September 30, 1999 Compared to Nine Months Ended September
  30, 1998

     Total revenues increased to $440.6 million, a 42.3% increase, in the nine
months ended September 30, 1999, from $309.6 million in the nine months ended
September 30, 1998. Net revenues (total revenues less cost of products sold)
increased to $415.6 million, a 44.4% increase, in the nine months ended
September 30, 1999, from $287.8 million in the nine months ended September 30,
1998. Total revenues and net revenues in the 1999 period increased primarily due
to the MobileMedia merger, which took place on June 3, 1999. The acquisition of
MobileMedia added approximately 2.8 million units in service while units in
service otherwise decreased by 14.0 thousand. Total revenues and net revenues
were also adversely affected by a general slowing of paging industry growth,
compared to prior years. Although industry sources estimate that the number of
paging units in service grew at an annual rate of approximately 25% between 1992
and 1997, growth in basic paging services has slowed considerably since 1997.
Revenues were also adversely affected by:

     - Arch's decision in the fourth quarter of 1998, in anticipation of the
       MobileMedia merger, not to replace normal attrition among direct sales
       personnel;

     - the reduced effectiveness of the reseller channel of distribution; and

     - reduced sales through Arch's company owned stores.

                                       84
<PAGE>   95

     Arch expects revenue to continue to be adversely affected in 1999 and 2000
due to these factors. Service, rental and maintenance revenues, which consist
primarily of recurring revenues associated with the sale or lease of units,
increased to $403.6 million, a 45.3% increase, in the nine months ended
September 30, 1999 from $277.8 million in the nine months ended September 30,
1998. These increases in revenues were due primarily to the acquisition of
MobileMedia on June 3, 1999. Maintenance revenues represented less than 10% of
total service, rental and maintenance revenues in the nine months ended
September 30, 1999 and 1998. Arch does not differentiate between service and
rental revenues. Product sales, less cost of products sold, increased to $12.0
million, a 20.4% increase, in the nine months ended September 30, 1999, from
$9.9 million in the nine months ended September 30, 1998, as a result of the
MobileMedia acquisition.

     Service, rental and maintenance expenses, which consist primarily of
telephone line and site rental expenses, were $91.4 million, 22.0% of net
revenues, in the nine months ended September 30, 1999, compared to $60.8
million, 21.1% of net revenues, in the nine months ended September 30, 1998. The
increases in the nine month periods were due primarily to increased expenses
associated with the provision of wireless communications services to a greater
number of units. Annualized service, rental and maintenance expenses per unit
increased to $22 in the nine months ended September 30, 1999, from $20 in the
corresponding 1998 period. This increase was due primarily to the increase in
paging systems and associated expenses as a result of the MobileMedia merger.
However, the per unit costs should decrease in the future if expected synergies
are achieved and as existing systems become more populated through the addition
of new units and the fixed costs of operating these systems are spread over a
greater unit base.

     Selling expenses were $57.6 million, 13.8% of net revenues, in the nine
months ended September 30, 1999 compared to $36.9 million, 12.8% of net
revenues, in the nine months ended September 30, 1998. The increase in absolute
dollars was primarily due to increased headcount and the increase as a
percentage of net revenues was primarily due to redundant headcount as a result
of the MobileMedia merger.

     General and administrative expenses increased to $123.6 million, 29.8% of
net revenues, in the nine months ended September 30, 1999 from $84.5 million,
29.4% of net revenues, in the nine months ended September 30, 1998. The increase
in absolute dollars was primarily due to increased headcount, administrative and
facility costs and the increase as a percentage of net revenues was primarily
due to the redundant headcount, administrative and facility costs associated
with MobileMedia.

     Depreciation and amortization expenses increased to $222.8 million in the
nine months ended September 30, 1999 from $165.0 million in the nine months
ended September 30, 1998. These expenses principally reflect the acquisition of
MobileMedia, as well as Arch's acquisitions in prior periods, accounted for as
purchases, and investment in wireless communication units and other system
expansion equipment to support growth. Additionally, depreciation expense for
the nine months ended September 30, 1999 included the write-off of approximately
$7.1 million of costs associated with the development of an integrated billing
and management system. Arch decided to discontinue development efforts due to
the capabilities of the system acquired in conjunction with the MobileMedia
merger.

     Operating losses were $77.7 million in the nine months ended September 30,
1999 compared to $74.2 million in the nine months ended September 30, 1998, as a
result of the factors outlined above.

     Net interest expense increased to $98.9 million in the nine months ended
September 30, 1999 from $76.7 million in the nine months ended September 30,
1998. The increase was principally attributable to an increase in Arch's
outstanding debt. Interest expense for the nine months ended September 30, 1999
and 1998 included approximately $30.4 million and $27.4 million, respectively,
of non-cash interest accretion on the discount notes under which semi-annual
interest payments commence on September 15, 2001.

     Other expense increased to $44.4 million in the nine months ended September
30, 1999 from $1.7 million in the nine months ended September 30, 1998. In the
nine months ended September 30, 1999, other expense includes $6.5 million
representing the write-off of Arch's investment in CONXUS Communications, Inc.
and $35.8 million associated with the arrangements made among Arch, Benbow and

                                       85
<PAGE>   96

Benbow's controlling stockholder in June 1999. CONXUS, which holds rights to a
50 KHz outbound/ 50 KHz inbound 2-way messaging license throughout the United
States, filed for bankruptcy protection in May 1999. See note (b) to the notes
to consolidated condensed financial statements for the quarter ended September
30, 1999.

     In June 1998, Arch recognized an extraordinary charge of $1.7 million
representing the write-off of unamortized deferred financing costs associated
with the prepayment of indebtedness under prior credit facilities.

     On January 1, 1999, Arch adopted SOP 98-5. SOP 98-5 requires costs of
start-up activities and organization costs to be expensed as incurred. Initial
application of SOP 98-5 resulted in a $3.4 million charge which was reported as
the cumulative effect of a change in accounting principle. This charge
represents the unamortized portion of start-up and organization costs which had
been deferred in prior years.

     Net loss increased to $227.6 million in the nine months ended September 30,
1999 from $156.4 million in the nine months ended September 30, 1998, as a
result of the factors outlined above.

  Year Ended December 31, 1998 Compared with Year Ended December 31, 1997

     Total revenues increased to $413.6 million, a 4.2% increase, in 1998 from
$396.8 million in 1997 as the number of units in service increased from 3.9
million at December 31, 1997 to 4.3 million at December 31, 1998. Net revenues
increased to $383.7 million, a 4.4% increase, in 1998 from $367.7 million in
1997. Total revenues and net revenues in 1998 were adversely affected by a
general slowing of industry growth, compared to prior years. Revenues were also
adversely affected in the fourth quarter of 1998 by:

     - Arch's decision, in anticipation of the MobileMedia acquisition, not to
       replace normal attrition among direct sales personnel;

     - the reduced effectiveness of Arch's reseller channel of distribution; and

     - reduced sales through Arch-operated retail stores.

     Service, rental and maintenance revenues increased to $371.2 million, a
5.5% increase, in 1998 from $351.9 million in 1997. These increases in revenues
were due primarily to the increase, through internal growth, in the number of
units in service from 3.9 million at December 31, 1997 to 4.3 million at
December 31, 1998. Maintenance revenues represented less than 10% of total
service, rental and maintenance revenues in 1998 and 1997. Product sales, less
cost of products sold, decreased to $12.5 million, a 20.4% decrease, in 1998
from $15.7 million in 1997, as a result of a decline in the average revenue per
unit sold.

     Service, rental and maintenance expenses, increased to $80.8 million, 21.1%
of net revenues, in 1998 from $79.8 million, 21.7% of net revenues, in 1997. The
increase was due primarily to increased expenses associated with system
expansions and an increase in the number of units in service. Annualized
service, rental and maintenance expenses per subscriber were $20 in 1998
compared to $22 in 1997.

     Selling expenses decreased to $49.1 million, 12.8% of net revenues, in 1998
from $51.5 million, 14.0% of net revenues, in 1997. The decrease was due
primarily to a decrease in the number of net new units in service and to
nonrecurring marketing costs incurred in 1997 to promote Arch's new Arch Paging
brand identity. The number of net new units in service resulting from internal
growth decreased by 35.1% in 1998 compared to 1997 primarily due to the factors
set forth above that adversely affected revenues.

     General and administrative expenses increased to $112.2 million, 29.2% of
net revenues, in 1998, from $106.0 million, 29.1% of net revenues, in 1997. The
increase was due primarily to administrative and facility costs associated with
supporting more units in service.

                                       86
<PAGE>   97

     Depreciation and amortization expenses decreased to $221.3 million in 1998
from $232.3 million in 1997. These expenses principally reflected Arch's
acquisitions in prior periods accounted for as purchases. They also reflected
investment in units and other system expansion equipment to support growth.

     Operating losses were $94.4 million in 1998 compared to $102.0 million in
1997, as a result of the factors outlined above.

     Net interest expense increased to $104.2 million in 1998 from $97.2 million
in 1997. The increase was principally attributable to an increase in Arch's
outstanding debt. Interest expense for 1998 included approximately $37.0 million
of interest which accretes on Arch's 10 7/8% senior discount notes even though
the cash payment of the interest is deferred. Interest expense for 1997 included
approximately $33.3 million of accretion on these notes.

     Arch recognized an income tax benefit of $21.2 million in 1997. This
benefit represented the tax benefit of operating losses incurred after the
acquisitions of USA Mobile and Westlink which were available to offset deferred
tax liabilities arising from those acquisitions. The tax benefit of these
operating losses was fully recognized during 1997. Accordingly, Arch established
a valuation reserve against its deferred tax assets which reduced the income tax
benefit to zero as of December 31, 1998. Arch does not expect to recover its
deferred tax asset in the foreseeable future and will continue to increase its
valuation reserve accordingly. See Note 5 to Arch's consolidated financial
statements.

     In June 1998, Arch recognized an extraordinary charge of $1.7 million
representing the write-off of unamortized deferred financing costs associated
with the prepayment of indebtedness under prior credit facilities.

     Net loss increased to $206.1 million in 1998 from $181.9 million in 1997,
as a result of the factors outlined above.

  Year Ended December 31, 1997 Compared with Year Ended December 31, 1996

     Total revenues increased $65.5 million, or 19.8%, to $396.8 million in 1997
from $331.4 million in 1996 and net revenues increased $63.8 million, or 21.0%,
from $303.9 million to $367.7 million over the same period. Service, rental and
maintenance revenues increased $60.5 million, or 20.8%, to $351.9 million in
1997 from $291.4 million in 1996. These increases in revenues were due primarily
to the increase in the number of units in service from 3.3 million at December
31, 1996 to 3.9 million at December 31, 1997 and the full year impact of the
Westlink acquisition which was completed in May 1996. Maintenance revenues
represented less than 10% of total service, rental and maintenance revenues in
1996 and 1997. Product sales, less cost of products sold, increased 25.9% to
$15.7 million in 1997 from $12.5 million in 1996 as a result of a greater number
of unit sales.

     Service, rental and maintenance expenses increased to $79.8 million, 21.7%
of net revenues, in 1997 from $65.0 million, 21.4% of net revenues, in 1996. The
increase was due primarily to increased expenses associated with system
expansions and an increase in the number of units in service. Annual service,
rental and maintenance expenses per subscriber decreased to $22 in 1997 from $25
in 1996.

     Selling expenses increased to $51.5 million, 14.0% of net revenues, in 1997
from $47.0 million, 15.4% of net revenues, in 1996. The increase in selling
expenses was due to the full year impact of the Westlink acquisition and the
marketing costs incurred to promote Arch's Arch Paging brand identity. Arch's
selling cost per net new unit in service increased to $87 in 1997 from $58 in
1996, primarily due to fixed selling costs and increased marketing costs being
spread over fewer net new units put into service.

     General and administrative expenses increased to $106.0 million, 29.1% of
net revenues, in 1997 from $86.2 million, 28.4% of net revenues, in 1996. The
increase in absolute dollars was due primarily to increased expenses associated
with supporting more units in service, including the full year impact of
Westlink, as well as expenses associated with the establishment of Arch's
national services division.

     Depreciation and amortization expenses increased to $232.3 million, 63.2%
of net revenues, in 1997 from $191.9 million, 63.1% of net revenues, in 1996.
These expenses reflect Arch's acquisitions, accounted

                                       87
<PAGE>   98

for as purchases, and continued investment in units and other system expansion
equipment to support continued growth.

     Operating loss increased to $102.0 million in 1997 from $86.1 million in
1996 as a result of the factors outlined above.

     Net interest expense increased to $97.2 million in 1997 from $75.9 million
in 1996. The increase was attributable to an increase in Arch's average
outstanding debt. Interest expense included approximately $33.0 million in 1997
and $24.0 million in 1996, of non-cash interest accretion on Arch's 10 7/8%
senior discount notes due 2008 under which semi-annual interest payments
commence on September 15, 2001. See Note 3 to Arch's consolidated financial
statements.

     Arch recognized income tax benefits of $21.2 million in 1997 and $51.2
million in 1996, representing the tax benefit of operating losses subsequent to
the acquisitions of USA Mobile in September 1995 and Westlink in May 1996 which
were available to offset deferred tax liabilities arising from Arch's
acquisitions of USA Mobile and Westlink.

     During 1996, Arch recognized an extraordinary charge of $1.9 million,
representing the write-off of unamortized deferred financing costs associated
with the prepayment of indebtedness under a prior credit facility.

     Net loss increased to $181.9 million in 1997 from $114.7 million in 1996 as
a result of the factors outlined above. Included in the net loss were charges of
$3.9 million for 1997 and $2.0 million for 1996, representing Arch's pro rata
share of Benbow's losses since the Westlink acquisition in May 1996.

LIQUIDITY AND CAPITAL RESOURCES

     Arch's business strategy requires the availability of substantial funds to
finance the expansion of existing operations, to fund capital expenditures for
subscriber equipment and network system equipment, to service debt and to
finance acquisitions.

  Capital Expenditures and Commitments

     Excluding acquisitions of wireless messaging businesses, Arch's capital
expenditures were $165.2 million in 1996, $102.8 million in 1997 and $113.2
million in 1998. Arch's capital expenditures decreased from $85.8 million in the
nine months ended September 30, 1998 to $83.2 million in the nine months ended
September 30, 1999. To date, Arch generally has funded its capital expenditures
with net cash provided by operating activities and the incurrence of debt. Arch
believes that it will have sufficient cash available from operations and credit
facilities to fund its capital expenditures for the remainder of 1999 and 2000.

     Arch's 1999 capital expenditures primarily involved the purchase of
wireless messaging units, system equipment and transmission equipment,
information systems, advances to Benbow, as described below, and capitalized
financing costs.

     Arch estimates the amount of capital that will be required to fund capital
expenditures by the combined company for 2000 will be approximately $267
million. Such expenditures will be used primarily for subscriber equipment,
network infrastructure, information systems and the construction of certain
markets for a nationwide network of narrowband personal communications services,
which are commonly referred to as N-PCS. However, the actual amount of capital
to be required by the combined company will depend upon a number of factors.
These include subscriber growth, the type of products and services demanded by
customers, service revenues, technological developments, marketing and sales
expenses, competitive conditions, the nature and timing of Arch's N-PCS
strategy, and acquisition strategies and opportunities. Arch believes it will
have sufficient cash available from operations and from borrowings under the
secured credit facility to fund anticipated capital expenditures of the combined
company for 2000.

                                       88
<PAGE>   99

     Through Arch's May 1996 acquisition of Westlink, Arch acquired a 49.9%
equity interest in Benbow PCS Ventures, Inc. Benbow holds exclusive rights to a
50 KHz outbound/12.5 KHz inbound N-PCS license in each of the five regions of
the United States. Arch was formerly obligated to advance to Benbow sufficient
funds to service debt obligations incurred by Benbow in connection with its
acquisition of its N-PCS licenses and to finance construction of an N-PCS system
unless funds were available to Benbow from other sources. This obligation was
subject to the approval of Arch's designee on Benbow's board of directors. As of
March 31, 1999, Arch had advanced approximately $23.7 million to Benbow. In June
1999, Arch, Benbow and Benbow's controlling stockholder agreed that:

     - the stockholders agreement, the management agreement and the employment
       agreement governing the establishment and operation of Benbow will be
       terminated;

     - Benbow will not make any further FCC payments and will not pursue
       construction of an N-PCS system;

     - Arch will not be obligated to fund FCC payments or construction of an
       N-PCS system by Benbow;

     - the parties will seek FCC approval of the forgiveness of Benbow's
       remaining payment obligations and the transfer of the controlling
       stockholder's Benbow shares to Arch;

     - the closing of the transaction will occur on the earlier of January 23,
       2001 or receipt of FCC approval; and

     - Arch will pay the controlling stockholder, in installments, $3.5 million
       (if the transaction closes before January 23, 2001) or $3.8 million (if
       the transaction closes on January 23, 2001).

     As a result of these arrangements, Benbow will not have any meaningful
business operations and is unlikely to retain its N-PCS licenses. The closing of
the transaction will not affect the funding obligations of Arch in connection
with Benbow's acquisition of Page Call in June 1998 described below.

  Other Commitments and Contingencies

     Interest payments on the $448.4 million principal amount at maturity of
Arch's discount notes commence September 15, 2001. Unless all of the discount
notes are tendered in the exchange offer, Arch expects to service such interest
payments out of cash made available to it by its subsidiaries. Based on the
principal amount of Arch's discount notes now outstanding, and assuming that no
notes are tendered, such interest payments will equal a maximum of $24.4 million
on March 15 and September 15 of each year until scheduled maturity on March 15,
2008. A default by Arch in its payment obligations under the discount notes
could have material adverse effects.

     On June 29, 1998, Benbow acquired all of the outstanding stock of Page Call
by issuing to Page Call's former stockholders preferred stock and a 12%
promissory note for $17.2 million. Benbow also agreed to pay one of Page Call's
stockholders $911,000 over five years for consulting services. Benbow's
preferred stock and promissory note, which will total $22.8 million upon
maturity at April 8, 2000, are exchangeable for Arch common stock:

     - at any time at the holders' option, at an exchange price equal to the
       higher of (1) $39.00 per share or (2) the market price of Arch common
       stock,

     - mandatorily on April 8, 2000, at the then prevailing market price of
       common stock, or

     - automatically at an exchange price of $39.00 per share, if the market
       price of Arch common stock equals or exceeds $39.00 for 20 consecutive
       trading days.

     Arch is permitted to require Benbow to redeem its preferred stock and
promissory note at any time for cash. Arch guaranteed all obligations of Benbow
under the Benbow preferred stock, promissory note and consulting agreement
described above. Arch may elect to make payments under its guarantee in common
stock or cash. Benbow's redemption of its preferred stock and promissory note
for cash, or Arch's payment of cash pursuant to its guarantees of Benbow's
preferred stock and promissory note, would depend

                                       89
<PAGE>   100

upon the availability of capital and any restrictions contained in applicable
debt instruments and under the Delaware corporations statute, which currently
would not permit any such cash redemptions or payments. If Arch issues common
stock or pays cash pursuant to its guarantees, Arch will receive from Benbow a
promissory note and non-voting, non-convertible preferred stock of Benbow with
an annual yield of 14.5% payable upon an acquisition of Benbow or earlier to the
extent that available cash and applicable law permit. Page Call's former
stockholders received customary registration rights for any shares of common
stock issued in exchange for Benbow's preferred stock and promissory note or
pursuant to Arch's guarantees.

     Arch may be obligated to pay PageNet a termination fee of $40.0 million in
specified circumstances. See note (j) to the notes to Arch's consolidated
condensed financial statements.

  Sources of Funds

     Arch's net cash provided by operating activities was $37.8 million in 1996,
$63.6 million in 1997, $81.1 million in 1998 and $76.4 million in the nine
months ended September 30, 1999. Arch expects to fund its capital needs for the
foreseeable future with borrowings under current and future credit facilities,
net cash provided by operations and, depending on Arch's needs and market
conditions, possible sales of equity or debt securities. For additional
information, see Note 3 to Arch's consolidated financial statements. Arch's
ability to borrow in the future will depend, in part, on its ability to continue
to increase its EBITDA. At September 30, 1999, Arch had $131 million in
available borrowing capacity under its secured credit facility.

  Secured Credit Facility

     In June 1998 and March 1999, an Arch subsidiary amended an existing credit
facility to establish senior secured revolving credit and term loan facilities
in the aggregate amount of $581.0 million consisting of:

     - Tranche A: a $175.0 million reducing revolving credit facility;

     - Tranche B: a $100.0 million 364-day revolving credit facility under which
       the principal amount outstanding on June 27, 1999 was converted into a
       term loan; and

     - Tranche C: a $306.0 million term loan of which $125.0 million was made
       available in a single drawing on June 29, 1998 and $181.0 million was
       made available in a single drawing on June 3, 1999.

     The amount of these facilities will reduce as time passes. See "Description
of Other Indebtedness -- Arch -- Senior Credit Facility".

  Recent Issuances of Notes

     In June 1998, a subsidiary of Arch issued $130.0 million principal amount
of 12 3/4% senior notes due 2007 for net proceeds of $122.6 million, after
deducting selling discounts and expenses, in a private placement made pursuant
to Rule 144A under the Securities Act. These notes were sold at an initial price
to investors of 98.049% of the face amount of their investment. On June 3, 1999,
the same subsidiary received the proceeds of an offering of $147.0 million
principal amount of 13 3/4% senior notes due 2008 in another Rule 144A
placement. The notes were sold at 95.091% of the face amount for net proceeds of
$134.6 million. See "Description of Other Indebtedness -- Arch -- Subsidiary's
Senior Notes".

  Equity Issued in Exchange for Debt

     In October 1999, Arch purchased $8.9 million principal amount of its
convertible subordinated debentures from two noteholders in exchange for 809,545
shares of Arch common stock, which had a weighted average closing price of $4.03
per share as of the dates of the transactions, and warrants to purchase 540,487
shares of Arch common stock for $9.03 per share. Arch also purchased $16.3
million

                                       90
<PAGE>   101

accreted value ($19.0 million principal amount at maturity) of discount notes in
exchange for 2,327,120 shares of Arch common stock, which had a weighted average
closing price of $4.01 per share as of the dates of the transactions. Following
these transactions, at October 31, 1999, Arch had $4.5 million principal amount
of the convertible debentures and $387.1 million accreted value ($448.4 million
principal amount at maturity) of discount notes outstanding.

  Sandler Equity Investment

     On June 29, 1998, two partnerships managed by Sandler Capital Management
Company, Inc., an investment management firm, together with certain other
private investors, made an equity investment in Arch of $25.0 million in the
form of Series C preferred stock. Arch used such amount to repay indebtedness
under a former credit facility as part of the establishment of the current
senior credit facility. See "Description of Arch's Equity Securities -- Series C
Preferred Stock".

     During 1999 Arch will accrue dividends of $2.1 million on the Series C
preferred stock, payable upon redemption or conversion of the Series C preferred
stock or liquidation of Arch.

  The MobileMedia Acquisition

     In June 1999, Arch acquired MobileMedia Communications, Inc., which is now
a wholly owned subsidiary of Arch. Immediately prior to the acquisition,
MobileMedia's parent company had contributed all of its assets to MobileMedia
Communications, Inc. Both MobileMedia companies had been operating as
debtors-in-possession under Chapter 11 of the Federal Bankruptcy Act.

     Arch acquired MobileMedia for a combination of cash and Arch securities, as
follows:

     - Arch paid approximately $479.0 million in cash to secured creditors of
       the MobileMedia debtors-in-possession;

     - Arch paid a total of $58.0 million to pay fees and expenses, repay all
       borrowings outstanding under MobileMedia's post-petition credit facility,
       pay pre-petition priority claims and post-petition claims incurred by the
       debtors-in-possession in the ordinary course of business or authorized by
       the bankruptcy court, and pay principal and accrued interest plus
       indenture trustee fees outstanding under senior notes assumed by
       MobileMedia in its acquisition of Dial Page in 1995;

     - Arch issued 4,781,656 shares of its common stock to unsecured creditors
       of MobileMedia;

     - Arch issued and sold 36,207,265 additional shares of its common stock to
       unsecured creditors of MobileMedia for a total purchase price of $217.2
       million; and

     - Arch issued to four unsecured creditors, who had agreed to act as standby
       purchasers and to purchase shares not purchased by other unsecured
       creditors, warrants to acquire up to 1,225,219 shares of its common stock
       on or before September 1, 2001 for $9.03 per share.

     Arch also issued to the holders of its common stock and Series C preferred
stock on January 27, 1999 non-transferable rights to acquire up to 14,964,388
shares of its common stock at a price of $6.00 per share. A total of 102,964
non-transferable rights were exercised. Because non-transferable rights to
acquire 14,861,424 shares were not exercised, Arch issued in their place
warrants to purchase 14,861,424 shares of its common stock for $9.03 per share.

     Subsidiaries of Arch also borrowed a total of $320.8 million, as described
above, to help fund the MobileMedia acquisition.

     During the third quarter of 1999, Arch decided to eliminate redundant
headcount and facilities in connection with the overall integration of
MobileMedia's operations. To the extent that it is determined that headcount and
facilities acquired with MobileMedia should be eliminated, the purchase price of
the acquisition was increased for accounting purposes to cover the costs. It is
expected that the MobileMedia integration process will continue until to end of
2000.

                                       91
<PAGE>   102

     In connection with the MobileMedia acquisition, Arch anticipates a net
reduction of approximately 10% of MobileMedia's workforce and the closing of
certain facilities and tower sites. This resulted in the establishment a $13.1
million acquisition reserve which is included in the purchase price of
MobileMedia for accounting purposes. The initial acquisition reserve consisted
of approximately (i) $5.6 million for employee severance, (ii) $7.0 million for
lease obligations and terminations and (iii) $0.5 million of other costs. The
acquisition reserve will continue to be evaluated in the event that assumptions
change in the future. There can no assurance that the desired cost savings will
be achieved or that the integration of the two companies will be accomplished
smoothly, expeditiously or successfully. See Note (h) to the notes to
consolidated condensed financial statements.

  Inflation

     Inflation has not had a material effect on Arch's operations to date.
Systems equipment and operating costs have not increased in price and Arch's
internal costs per unit have tended to decline in recent years. This reduction
in costs has generally been reflected in lower pager prices charged to
subscribers who purchase their units. Arch's general operating expenses, such as
salaries, employee benefits and occupancy costs, are subject to normal
inflationary pressures.

YEAR 2000 COMPLIANCE

     The Year 2000 problem is the result of computer programs being written
using two digits (rather than four) to define the applicable year or otherwise
inadequately dealing with dates. Any of Arch's programs or internal or external
systems that have date-sensitive software may recognize a date using "00" as the
year 1900 rather than the year 2000. This recognition could result in a system
failure or miscalculations causing disruptions of operations, including, among
other things, a temporary inability to process transactions, send invoices or
engage in similar normal business activities. To date no problems relating to
the transition from December 31, 1999 to January 1, 2000 have been identified.
Arch will continue to monitor and test for potential Year 2000 issues that could
arise in the future, such as those potential issues which could arise as a
result of Year 2000 being a leap year.

     To address these potential issues, Arch created a cross-functional Y2K
project group that analyzed and identified internal and external areas likely to
be affected by the Year 2000 problem. Arch requested information from certain
mission critical vendors and held discussions with equipment and other mission
critical vendors concerning their efforts to identify and address potential
issues associated with their equipment and/or software. Arch created contingency
plans in anticipation of the December 31, 1999 to January 1, 2000 transition. In
addition, Arch tested units and messaging-related equipment used by Arch and its
customers with favorable results. Nevertheless, this equipment is manufactured
by third parties, and, accordingly, Arch has relied, and continues to rely, to a
large extent on the representations of its vendors. Arch cannot offer assurance
as to the accuracy of its vendors' representations or its ability to replicate
its testing results in a real time environment.

     Arch began testing its applications in 1998. This testing detected
applications that may be affected by the Year 2000 problem. Arch has completed
what it believes to be appropriate modifications and/or replacements of its
computerized systems and applications to address these potential issues and to
be Year 2000 ready. The costs associated with such replacements have been
capitalized and amortized in accordance with Arch's existing accounting policies
and future replacement costs, if any, will be capitalized and amortized in a
similar manner. Maintenance or modification costs have been, and will be,
expensed as incurred. To date, Arch does not believe that resolution of the Year
2000 problem has had a material adverse effect on its results of operations or
financial condition. Actual costs and results may vary significantly due to the
uncertainties associated with the problem, which may not be apparent until the
second quarter of 2000.

     Arch's contingency plans for the December 31, 1999 to January 1, 2000
transition included, among other things, the use of (1) backup generators for
some of its operations, (2) some alternate vendors and

                                       92
<PAGE>   103

(3) various communication channels to deploy its work force in a timely and
efficient manner to address potential issues that could arise. Each of these
plans may be used, if necessary, in anticipation of the transition to any other
dates determined to be potentially affected by the Year 2000 problem.

RECENT AND PENDING ACCOUNTING PRONOUNCEMENTS

     In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 130 "Reporting Comprehensive Income". SFAS
No. 130 establishes standards for reporting and display of comprehensive income
and its components (revenues, expenses, gains and losses) in a full set of
general-purpose financial statements. Arch adopted SFAS No. 130 in 1998. The
adoption of this standard did not have an effect on its reporting of income.

     In June 1997, the Financial Accounting Standards Board issued SFAS No. 131
"Disclosures about Segments of an Enterprise and Related Information". SFAS No.
131 establishes standards for reporting information about operating segments in
annual financial statements and requires selected information about operating
segments in interim financial reports. SFAS No. 131 also establishes standards
for related disclosures about products and services, geographic areas and major
customers. Arch adopted SFAS No. 131 for its year ended December 31, 1998.
Adoption of this standard did not have a significant impact on Arch's reporting.

     In March 1998, the Accounting Standards Committee of the Financial
Accounting Standards Board issued Statement of Position 98-1 "Accounting for the
Costs of Computer Software Developed or Obtained for Internal Use". SOP 98-1
establishes criteria for capitalizing costs of computer software developed or
obtained for internal use. Arch adopted SOP 98-1 in 1998. The adoption of SOP
98-1 has not had a material effect on Arch's financial position or results of
operations.

     In April 1998, the Accounting Standards Executive Committee of the
Financial Accounting Standards Board issued Statement of Position 98-5
"Reporting on the Costs of Start-Up Activities". SOP 98-5 requires costs of
start-up activities and organization costs to be expensed as incurred. Arch
adopted SOP 98-5 effective January 1, 1999. The initial application of SOP 98-5
resulted in a $3.4 million charge which was reported as the cumulative effect of
a change in accounting principle. The charge represents the unamortized portion
of start-up and organization costs which had been deferred in prior years. The
adoption of SOP 98-5 is not expected to have a material effect on Arch's
financial position or results of operations.

     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133
"Accounting for Derivative Instruments and Hedging Activities". SFAS No. 133
requires that every derivative instrument be recorded in the balance sheet as
either an asset or liability measured at its fair value and that changes in the
derivative's fair value be recognized currently in earnings. Arch intends to
adopt this standard effective January 1, 2001. Arch has not yet quantified the
impact of adopting SFAS No. 133 on its financial statements; however, adopting
SFAS No. 133 could increase volatility in earnings and other comprehensive
income.

                                       93
<PAGE>   104

   SELECTED HISTORICAL CONSOLIDATED FINANCIAL AND OPERATING DATA--MOBILEMEDIA

     The following table sets forth selected historical consolidated financial
and operating data of MobileMedia for each of the five years in the period ended
December 31, 1998 and the three months ended March 31, 1998 and 1999. The
historical financial and operating data presented under consolidated statements
of operations data and consolidated balance sheet data for each of the five
years in the period ended December 31, 1998 have been derived from MobileMedia's
audited consolidated financial statements and notes. The selected financial and
operating data as of March 31, 1998 and for the three months ended March 31,
1998 and 1999 have been derived from MobileMedia's unaudited consolidated
financial statements and notes. You should read the following consolidated
financial information in conjunction with "MobileMedia Management's Discussion
and Analysis of Financial Condition and Results of Operations" and MobileMedia's
consolidated financial statements and notes set forth below.

     MobileMedia completed its acquisition of the paging and wireless messaging
business of Dial Page, Inc. on August 31, 1995 for a purchase price of $187.4
million. The consolidated statement of operations data includes Dial Page's
results of operations from that date. See Note 3 to MobileMedia's consolidated
financial statements and "Business--Predecessors to the Combined Company; Events
Leading Up to MobileMedia's Bankruptcy Filings". MobileMedia completed the
acquisition of Mobile Communications Corporation of America, commonly known as
MobileComm, on January 4, 1996 for a purchase price of $928.7 million. The
consolidated statement of operations data includes MobileComm results of
operations from that date. See Note 3 to MobileMedia's consolidated financial
statements and "Arch's Business -- The Company".

     In the following table, services, rents and maintenance, selling, general
and administrative expenses includes non-recurring adjustments to record
executive separation expenses of $2.5 million in 1994 and $0.7 million in 1995.

     Impairment of long-lived assets includes a non-recurring adjustment to
record, effective December 31, 1996, a $792.5 million write-down of intangible
assets based upon MobileMedia's determination that an impairment of long-lived
assets existed pursuant to Statement of Financial Accounting Standards No. 121
"Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to
be Disposed of ". See Note 2 to MobileMedia's consolidated financial statements.

     Restructuring costs includes non-recurring adjustments to record
restructuring costs related to MobileMedia's bankruptcy filing on January 30,
1997.

     MobileMedia's adjusted EBITDA represents earnings before other income
(expense), taxes, depreciation, amortization, amortization of deferred gain on
tower sale, impairment of long-lived assets and restructuring costs. EBITDA is a
financial measure commonly used in MobileMedia's industry and should not be
construed as an alternative to operating income, as determined in accordance
with GAAP, as an alternative to cash flows from operating activities, as
determined in accordance with GAAP, or as a measure of liquidity. MobileMedia's
adjusted EBITDA is, however, the primary financial measure by which
MobileMedia's covenants are calculated under the agreements governing
MobileMedia's indebtedness. EBITDA is also one of the financial measures used by
analysts to value MobileMedia. MobileMedia's adjusted EBITDA in 1996 excludes
the impact of the $792.5 million writedown of intangible assets. MobileMedia's
adjusted EBITDA may not necessarily be comparable to similarly titled data of
other paging companies.

     Adjusted EBITDA margin is calculated by dividing MobileMedia's adjusted
EBITDA by total revenues less cost of products sold. EBITDA margin is a measure
commonly used in the paging industry to evaluate a company's EBITDA relative to
total revenues less cost of products sold as an indicator of the efficiency of a
company's operating structure. MobileMedia's adjusted EBITDA margin in 1996
excludes the impact of the $792.5 million writedown of intangible assets. The
interim financial information as of March 31, 1999 and for the three months
ended March, 1998 and 1999 contained in this joint proxy statement/prospectus is
unaudited. However, in the opinion of MobileMedia management, it includes all

                                       94
<PAGE>   105

adjustments of a normal recurring nature that are necessary for a fair
presentation of the financial position, results of operations and cash flows for
the periods presented. Results of operations for the interim periods presented
are not necessarily indicative of results of operations for the entire year or
any future period.

<TABLE>
<CAPTION>
                                                                                                              (UNAUDITED)
                                                                                                             THREE MONTHS
                                                                                                                 ENDED
                                                          YEAR ENDED DECEMBER 31,                              MARCH 31,
                                       --------------------------------------------------------------   -----------------------
                                          1994         1995         1996         1997         1998         1998         1999
                                       ----------   ----------   -----------   ---------   ----------   ----------   ----------
                                                                        (DOLLARS IN THOUSANDS)
<S>                                    <C>          <C>          <C>           <C>         <C>          <C>          <C>
STATEMENTS OF OPERATIONS DATA:
        Total revenues...............  $  203,149   $  252,996   $   640,710   $ 527,392   $  449,681   $  115,163   $  105,824
Cost of products sold................     (18,705)     (26,885)      (72,595)    (35,843)     (22,162)      (5,513)      (3,516)
                                       ----------   ----------   -----------   ---------   ----------   ----------   ----------
                                          184,444      226,111       568,115     491,549      427,519      109,650      102,308
Services, rents and maintenance,
  selling, and general and
  administrative expenses............     136,672      164,037       459,474     388,476      305,698       79,510       72,694
Reduction of liabilities subject to
  compromise.........................          --           --            --          --      (10,461)          --       (3,050)
Impairment of long-lived assets......          --           --       792,478          --           --           --           --
Restructuring costs..................          --           --         4,256      19,811       18,624        4,558        5,067
Depreciation and amortization........      67,651       71,408       348,698     140,238      116,459       31,671       27,969
Amortization of deferred gain on
  tower sale.........................          --           --            --          --       (1,556)          --       (1,167)
                                       ----------   ----------   -----------   ---------   ----------   ----------   ----------
Operating (loss) income..............     (19,879)      (9,334)   (1,036,791)    (56,976)      (1,245)      (6,089)         795
Other income (expense) Interest
  expense............................     (18,237)     (31,745)      (92,663)    (67,611)     (53,043)     (14,626)     (10,018)
(Loss) gain on sale of assets........       1,049           --            68           3       94,165            1         (323)
Other................................          --           --            --          --         (338)          --        2,063
                                       ----------   ----------   -----------   ---------   ----------   ----------   ----------
        Total other income
          (expense)..................     (17,188)     (31,745)      (92,595)    (67,608)      40,784      (14,625)      (8,278)
                                       ----------   ----------   -----------   ---------   ----------   ----------   ----------
Income (loss) before income tax
  provision (benefit)................     (37,067)     (41,079)   (1,129,386)   (124,584)      39,539      (20,714)      (7,483)
Income tax benefit (provision).......          --           --        69,442          --       (3,958)          --         (209)
                                       ----------   ----------   -----------   ---------   ----------   ----------   ----------
Net income (loss)....................  $  (37,067)  $  (41,079)  $(1,059,944)  $(124,584)  $   35,581   $  (20,714)  $   (7,692)
                                       ==========   ==========   ===========   =========   ==========   ==========   ==========
OTHER DATA
Adjusted EBITDA......................  $   47,772   $   62,074   $   108,641   $ 103,073   $  121,821   $   30,140   $   29,614
Adjusted EBITDA margin...............      25.9 %       27.5 %        19.1 %      21.0 %        28.5%        27.5%        28.9%
Units in service (at end of
  period)............................   1,447,352    2,369,101     4,424,107   3,440,342    3,143,968    3,319,553    3,106,775
Capital expenditures.................  $   65,574   $   86,163   $   161,861   $  40,556   $   53,867   $    4,854   $   26,806
Cash flows provided by operating
  activities.........................  $   53,781   $   43,849   $    57,194   $  14,920   $   54,462   $   19,542   $   17,552
Cash flows provided by (used in)
  investing activities...............  $  (50,878)  $ (312,698)  $(1,028,321)  $ (40,556)  $  115,836   $   (4,854)  $  (25,025)
Cash flows provided by (used in)
  financing activities...............  $       --   $  671,794   $   586,111   $  13,396   $ (180,000)  $  (10,000)  $    6,255
</TABLE>

<TABLE>
<CAPTION>
                                                                        AS OF DECEMBER 31,                          AS OF
                                                    ----------------------------------------------------------    MARCH 31,
                                                      1994        1995         1996         1997        1998         1999
                                                    --------   ----------   ----------   ----------   --------   ------------
                                                               (DOLLARS IN THOUSANDS)                            (UNAUDITED)
<S>                                                 <C>        <C>          <C>          <C>          <C>        <C>
CONSOLIDATED BALANCE SHEET DATA
Total assets......................................  $353,703   $1,128,546   $  790,230   $  655,134   $561,454     $554,009
Debt..............................................   195,677      476,156    1,074,196    1,075,681    905,681      910,681
Total stockholders' equity (deficit)..............   101,500      578,753     (468,391)    (589,579)  (553,998)    (561,690)
</TABLE>

                                       95
<PAGE>   106

     The following table reconciles net income to the presentation of
MobileMedia's adjusted EBITDA.

<TABLE>
<CAPTION>
                                                                                                             (UNAUDITED)
                                                                                                             THREE MONTHS
                                                               YEAR ENDED DECEMBER 31,                     ENDED MARCH 31,
                                               --------------------------------------------------------   ------------------
                                                 1994       1995        1996         1997        1998       1998      1999
                                               --------   --------   -----------   ---------   --------   --------   -------
                                                                          (DOLLARS IN THOUSANDS)
<S>                                            <C>        <C>        <C>           <C>         <C>        <C>        <C>
Net income (loss)............................  $(37,067)  $(41,079)  $(1,059,944)  $(124,584)  $ 35,581   $(20,714)  $(7,692)
Interest expense.............................    18,237     31,745        92,663      67,611     53,043     14,626    10,018
Income tax provision (benefit)...............        --         --       (69,442)         --      3,958         --       209
Depreciation and amortization................    67,651     71,408       348,698     140,238    116,459     31,671    27,969
Amortization of deferred gain on tower
  sale.......................................        --         --            --          --     (1,556)        --    (1,167)
Restructuring costs..........................        --         --         4,256      19,811     18,624      4,558     5,067
Impairment of long lived assets..............        --         --       792,478          --         --         --        --
Reduction of liabilities subject to
  compromise.................................        --         --            --          --    (10,461)        --    (3,050)
Gain/loss on sale of assets..................    (1,049)        --           (68)         (3)   (94,165)        (1)      323
Other income/expense.........................        --         --            --          --        338         --    (2,063)
                                               --------   --------   -----------   ---------   --------   --------   -------
Adjusted EBITDA..............................  $ 47,772   $ 62,074   $   108,641   $ 103,073   $121,821   $ 30,140   $29,614
                                               ========   ========   ===========   =========   ========   ========   =======
</TABLE>

                                       96
<PAGE>   107

                MOBILEMEDIA MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     The following discussion and analysis describes MobileMedia's operations
through March 31, 1999. This section should be read in conjunction with
MobileMedia's consolidated financial statements and notes.

     The following are principal components of MobileMedia's operating results:

     - Services, rents and maintenance revenues, also referred to as paging
       revenue:  includes primarily monthly, quarterly, semi-annually and
       annually billed recurring revenue, not dependent on usage, charged to
       subscribers for paging and related services such as voice mail and pager
       repair and replacement.

     - Net revenues:  includes primarily paging revenues and sales of customer
       owned and maintained units less cost of units sold.

     - Services, rents and maintenance expenses:  includes costs related to the
       management, operation and maintenance of MobileMedia's network systems.

     - Selling expenses:  includes salaries, commissions and administrative
       costs for MobileMedia's sales force and related marketing and advertising
       expenses.

     - General and administrative expenses:  includes primarily customer service
       expense, executive management, accounting, office telephone, rents and
       maintenance and information services.

     - Average revenues per unit, or ARPU:  calculated by dividing (1) the
       average monthly services, rents and maintenance revenues for the period
       by (2) the weighted average number of units in service for the period.
       ARPU, as determined by MobileMedia, may not necessarily be comparable to
       similarly titled data of other paging companies.

     - Average monthly operating expense per unit:  calculated by dividing (1)
       the average monthly services, rents and maintenance, selling and general
       and administrative expenses for the period by (2) the weighted average
       number of units in service for the period.

     MobileMedia's adjusted EBITDA represents earnings before other income
(expense), taxes, depreciation, amortization, impairment of long-lived assets,
amortization of deferred gain on its tower sale and restructuring costs. See
notes 2 and 3 to MobileMedia's consolidated financial statements.

     As used below, the term "acquisitions" refers to both the MobileComm
acquisition and the Dial Page acquisition.

     MobileMedia built and operated wireless messaging and communications
systems and generated revenues from the provision of paging and other wireless
communications services. MobileMedia's strategy was to strengthen its industry
leadership position by providing superior paging and messaging services at
competitive prices.

     MobileMedia's revenues were derived primarily from fixed periodic recurring
fees charged to MobileMedia's subscribers for paging services. These fees were
not dependent on usage. While a subscriber remained in MobileMedia's service,
future operating results benefitted from this recurring revenue stream with
minimal requirements for incremental selling expenses or other costs.

     MobileMedia completed its acquisition of MobileComm in January 1996 and
purchased the paging business of Dial Page in August 1995. MobileMedia incurred
integration related costs in excess of those originally anticipated to (1)
transfer units-in-service between paging networks to rationalize capacity, (2)
temporarily operate duplicative functions, primarily customer service, and (3)
hire additional employees and consultants to focus on the integration.
MobileMedia also experienced increased loss of subscribers related to the
integration difficulties. MobileMedia's financial results were negatively
impacted by the higher than anticipated integration costs and increased loss of
subscribers.

                                       97
<PAGE>   108

     On January 30, 1997, MobileMedia and its parent company filed voluntary
petitions for relief under the Bankruptcy Code in order to implement an
operational and financial restructuring. Until Arch's acquisition of MobileMedia
on June 3, 1999, MobileMedia and its parent company operated their business as
debtors-in-possession subject to the jurisdiction of the bankruptcy court.

RESULTS OF OPERATIONS

     The following table presents selected items from MobileMedia's consolidated
statement of operations and selected other information for the periods
indicated:

<TABLE>
<CAPTION>
                                                                       (UNAUDITED)
                                                               THREE MONTHS ENDED MARCH 31,
                                                    --------------------------------------------------
                                                             1998                       1999
                                                    ----------------------     -----------------------
                                                     (IN THOUSANDS, EXCEPT PERCENTAGE AND UNIT DATA)
<S>                                                 <C>            <C>         <C>            <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA
Revenues
  Services, rents and maintenance.................   $108,542        99.0%      $100,631         98.4%
  Equipment sales and activation fees.............      6,621         6.0          5,193          5.1
                                                     --------       -----       --------       ------
Total revenues....................................    115,163       105.0        105,824        103.4
Cost of products sold.............................     (5,513)       (5.0)        (3,516)        (3.4)
                                                     --------       -----       --------       ------
Net revenues......................................    109,650       100.0        102,308        100.0
Operating expenses
  Services, rents and maintenance.................     28,899        26.4         27,077         26.5
  Selling.........................................     15,703        14.5         14,136         13.8
  General and administrative......................     34,908        31.8         31,481         30.8
  Reduction of liabilities subject to
     compromise...................................         --          --         (3,050)        (3.0)
  Restructuring costs.............................      4,558         4.2          5,067          5.0
  Depreciation and amortization...................     31,671        28.9         27,969         27.3
  Amortization of deferred gain on tower sale.....         --          --         (1,167)        (1.1)
                                                     --------       -----       --------       ------
Total operating expenses..........................    115,739       105.6        101,513         99.2
                                                     --------       -----       --------       ------
Operating income (loss)...........................     (6,089)       (5.6)           795          0.8
Other income (expense)
  Interest expense (net)..........................    (14,626)      (13.3)       (10,018)        (9.8)
  Gain (loss) on sale of assets...................          1         0.0           (323)        (0.3)
  Other income....................................         --          --          2,063          2.0
                                                     --------       -----       --------       ------
Total other income (expense)......................    (14,625)      (13.3)        (8,278)        (8.1)
                                                     --------       -----       --------       ------
Income from continuing operations before income
  tax provision...................................    (20,714)      (18.9)        (7,483)        (7.3)
Income tax provision..............................         --          --            209          0.2
                                                     --------       -----       --------       ------
Income from continuing operations.................   $(20,714)      (18.9)%     $ (7,692)        (7.5)%
                                                     ========       =====       ========       ======
</TABLE>

                                       98
<PAGE>   109

<TABLE>
<CAPTION>
                                                                     (UNAUDITED)
                                                                  THREE MONTHS ENDED
                                                                      MARCH 31,
                                                              --------------------------
                                                                 1998           1999
                                                              -----------    -----------
                                                                (IN THOUSANDS, EXCEPT
                                                              PERCENTAGE AND UNIT DATA)
<S>                                                           <C>            <C>
OTHER DATA
Adjusted EBITDA.............................................  $   30,140     $   29,614
Cash flows provided by operating activities.................      19,542         17,553
Cash flows used in investing activities.....................      (4,854)       (25,025)
Cash flows provided by (used in) financing activities.......     (10,000)         6,255
ARPU........................................................       10.70          10.73
Average monthly operating expense per unit..................        7.84           7.75
Units in service (at end of period).........................   3,319,553      3,106,775
</TABLE>

  Three Months Ended March 31, 1999 Compared With Three Months Ended March 31,
1998

     Units in service decreased 212,778 from 3,319,553 as of March 31, 1998 to
3,106,775 as of March 31, 1999, and decrease of 6.4%. The decrease was primarily
attributable to gross additions which were below expectations due to competitive
pressures.

     Services, rents and maintenance revenues decreased 7.3% to $100.6 million
for the three months ended March 31, 1999 compared to $108.5 million for the
three months ended March 31, 1998. The decrease was attributable to fewer units
in service and partially offset by the $0.03 increase in ARPU from $10.70 for
the three months ended March 31, 1998 to $10.73 for the three months ended March
31, 1999. The increase in ARPU was largely due to a greater percentage of
alphanumeric units in service and a smaller percentage in the reseller
distribution channel. Alphanumeric units generally are sold at higher ARPU and
units sold through the reseller distribution channel are generally sold at lower
ARPU.

     Equipment sales and activation fees decreased 21.6% to $5.2 million for the
three months ended March 31, 1999 compared to $6.6 million for the three months
ended March 31, 1998. The decrease in equipment sales was primarily due to a
$0.7 million decrease in equipment sold through the direct distribution channel
and a $0.6 million decrease in billings for non-returned equipment. Equipment
sales and activations fees, less cost of products sold, increased to $1.7
million for the three months ended March 31, 1999 from $1.1 million for the
three months ended March 31, 1998. This increase was primarily attributable to
improved equipment sales margins on units sold through the retail distribution
channel.

     Net revenues decreased 6.7% to $102.3 million for the three months ended
March 31, 1999 compared to $109.7 million for the three months ended March 31,
1998.

     Services, rents and maintenance expenses decreased 6.3% to $27.1 million
for the three months ended March 31, 1999 compared to $28.9 million for the
three months ended March 31, 1998. This decrease resulted primarily from lower
subcontracted paging expenses of approximately $3.2 million arising from billing
reconciliations, increased unit cancellations and customer migration to
company-owned networks, lower paging-related telecommunications expenses of
approximately $0.6 million as a result of continued usage of lower cost
facilities and lower pager repair expenses of $0.4 million. These expense
reductions were offset by an increase in antenna site lease expense of $2.7
million primarily resulting from the leaseback of antenna sites on transmission
towers sold to Pinnacle Towers, Inc. See note 3 to MobileMedia's consolidated
financial statements. As a percentage of net revenue, services, rents and
maintenance expenses were constant at approximately 26.5%.

     Selling expenses for the three months ended March 31, 1999 decreased 10.0%
to $14.1 million compared to $15.7 million for the three months ended March 31,
1998. The decrease resulted primarily from lower sales personnel costs of
approximately $0.8 million attributable to lower sales headcount, lower
advertising expenses of approximately $0.6 million and lower retail distribution
channel selling expenses of

                                       99
<PAGE>   110

approximately $0.2 million resulting from lower retail sales. Selling expenses
as a percentage of net revenue decreased from 14.3% to 13.8%.

     General and administrative expenses decreased 9.8% to $31.5 million for the
three months ended March 31, 1999 compared to $34.9 million for the three months
ended March 31, 1998 and decreased as a percentage of net revenues to 30.8% for
the three months ended March 31, 1999. The decrease primarily resulted from
reduced bad debt expense of $1.3 million due to improvements in MobileMedia's
billing and collections functions, lower administrative telephone expenses of
$1.0 million resulted from lower call volume and lower customer service expenses
of $1.4 million primarily resulting from lower headcount.

     Reduction of liabilities subject to compromise was $3.1 million for the
three months ended March 31, 1999. See note 2 to MobileMedia's consolidated
financial statements.

     Restructuring costs increased 11.2% from $4.6 million for the three months
ended March 31, 1998 to $5.1 million for the three months ended March 31, 1999
due to an increase in professional fees incurred by MobileMedia resulting from
its confirmed plan of reorganization on April 12, 1999. See note 1 to
MobileMedia's consolidated financial statements.

     Depreciation and amortization decreased 11.7% to $28.0 million for the
three months ended March 31, 1999 compared to $31.7 million for the three months
ended March 31, 1998. The decrease was primarily due to lower pager depreciation
attributable to a reduced depreciable base of pager assets and decreased pager
purchases. As a percentage of net revenues, depreciation and amortization
expense decreased to 27.3% for the three months ended March 31, 1999 from 28.9%
for the three months ended March 31, 1998.

     Amortization of deferred gain on tower sale was $1.2 million for the three
months ended March 31, 1999. See note 3 to MobileMedia's consolidated financial
statements.

     Operating income (loss) increased 113.1% to income of $0.8 million for the
three months ended March 31, 1999 form a loss of $6.1 million for the three
months ended March 31, 1998. The increase was primarily due to decreased
operating expenses.

     Interest expense decreased 31.5% to $10.0 million for the three months
ended March 31, 1999 compared to $14.7 million for the three months ended March
31, 1998. The decrease was primarily due to lower interest expense on
MobileMedia's pre-petition credit facility resulting from lower outstanding
borrowings in the three months ended March 31, 1999.

     Gain (loss) on sale of assets of $0.3 million for the three months ended
March 31, 1999 was primarily due to the write off of equipment related to the
resolution of a legal dispute with an equipment provider.

     Other income was $2.1 million for the three months ended March 31, 1999 and
primarily resulted from resolution of a legal dispute with an equipment
provider.

     Loss from continuing operations before income tax provision, as a result of
the above factors, decreased to $7.5 million for the three months ended March
31, 1999 compared to $20.7 million for the three months ended March 31, 1998.

                                       100
<PAGE>   111

     Income tax provision increased to $0.2 million for the three months ended
March 31, 1999 primarily as a result of state income tax expense.

<TABLE>
<CAPTION>
                                                                    YEAR ENDED DECEMBER 31,
                                                       --------------------------------------------------
                                                                1997                       1998
                                                       -----------------------    -----------------------
                                                        (IN THOUSANDS, EXCEPT PERCENTAGE AND UNIT DATA)
<S>                                                    <C>            <C>         <C>            <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA
Revenues
  Services, rents and maintenance....................   $  491,174       99.9%     $  423,059       99.0%
  Equipment sales and activation fees................       36,218        7.4          26,622        6.2
                                                        ----------     ------      ----------     ------
Total revenues.......................................      527,392      107.3         449,681      105.2
Cost of products sold................................      (35,843)      (7.3)        (22,162)      (5.2)
                                                        ----------     ------      ----------     ------
Net revenues.........................................      491,549      100.0         427,519      100.0
Operating expenses
  Services, rents and maintenance....................      139,333       28.3         111,589       26.1
  Selling............................................       69,544       14.2          61,106       14.3
  General and administrative.........................      179,599       36.5         133,003       31.1
  Reduction of liabilities subject to compromise.....           --         --         (10,461)      (2.4)
  Restructuring costs................................       19,811        4.0          18,624        4.4
  Depreciation and amortization......................      140,238       28.6         116,459       27.2
  Amortization of deferred gain on tower sale........           --         --          (1,556)      (0.4)
                                                        ----------     ------      ----------     ------
Total operating expenses.............................      548,525      111.6         428,764      100.3
                                                        ----------     ------      ----------     ------
Operating loss.......................................      (56,976)     (11.6)         (1,245)      (0.3)
Other income (expense)
  Interest expense (net).............................      (67,611)     (13.7)        (53,043)     (12.4)
  Gain on sale of assets.............................            3        0.0          93,827       21.9
                                                        ----------     ------      ----------     ------
Total other income (expense).........................      (67,608)     (13.7)         40,784        9.5
                                                        ----------     ------      ----------     ------
Income (loss) from continuing operations before
  income tax provision...............................   $ (124,584)     (25.3)     $   39,539        9.2
Income tax provision.................................           --         --           3,958        0.9
                                                        ----------     ------      ----------     ------
Income (loss) from continuing operations.............   $ (124,584)     (25.3)%    $   35,581        8.3%
                                                        ==========     ======      ==========     ======
OTHER DATA
Adjusted EBITDA......................................   $  103,073       21.0%     $  121,821       28.5%
Cash flows provided by operating activities..........       14,920                     54,462
Cash flows provided by (used in) investing
  activities.........................................      (40,556)                   115,836
Cash flows provided by (used in) financing
  activities.........................................       13,396                   (180,000)
ARPU.................................................        10.41                      10.71
Average monthly operating expense per unit...........         8.23                       7.74
Units in service (at end of period)..................    3,440,342                  3,143,968
</TABLE>

  Year Ended December 31, 1998 Compared With Year Ended December 31, 1997

     Units in service decreased 296,374 from 3,440,342 as of December 31, 1997
to 3,143,968 as of December 31, 1998, a decrease of 8.6%. The decrease was
primarily attributable to gross additions which were below expectations due to
competitive pressures.

     Services, rents and maintenance revenues decreased 13.9% to $423.1 million
for 1998 compared to $491.2 million for 1997. The decrease was attributable to
fewer units in service and was partially offset by a $0.30 increase in ARPU from
$10.41 for 1997 to $10.71 for 1998. The increase in ARPU was largely

                                       101
<PAGE>   112

due to a greater percentage of alphanumeric units in service, increased units in
service in the direct distribution channel and a smaller percentage in the
reseller distribution channel.

     Equipment sales and activation fees decreased 26.5% to $26.6 million for
1998 compared to $36.2 million for 1997. The decrease in equipment sales was
primarily due to a $2.7 million decrease in equipment sold through the retail
distribution channel and a $5.7 million decrease in billings for non-returned
equipment. Equipment sales and activation fees, less cost of products sold,
increased to $4.5 million for 1998 from $0.4 million for 1997. This increase was
primarily attributable to sales of used pagers with lower net book values
resulting from a change in pager depreciation from a four-year life to a three-
year life as of October 1, 1997.

     Net revenues decreased 13.0% to $427.5 million for 1998 compared to $491.5
million for 1997.

     Services, rents and maintenance expenses decreased 19.9% to $111.6 million
for 1998 compared to $139.3 million for 1997. This decrease resulted primarily
from lower subcontracted paging expenses of approximately $15.9 million arising
from billing reconciliations, increased unit cancellations, increased movement
of customers to company-owned networks and a reduction of approximately $10.4
million in paging-related telecommunications expenses. The decline in
paging-related telecommunications expenses resulted primarily from the FCC's
clarification of its interconnection rules pursuant to the Telecommunications
Act. These rules prohibit local exchange carriers from charging paging carriers
for the cost of dedicated facilities used to deliver local telecommunications
traffic to paging networks. The FCC clarification, however, noted that the FCC
is considering requests for reconsideration of these rules. In addition,
paging-related telecommunications expense declined as a result of a
reconfiguration of MobileMedia's network to maximize usage of lower cost
facilities. As a percentage of net revenue, services, rents and maintenance
expenses decreased from 28.3% to 26.1%.

     Selling expenses for 1998 decreased 12.1% to $61.1 million compared to
$69.5 million for 1997. The decrease resulted primarily from lower sales
personnel costs of approximately $6.4 million attributable to lower sales
headcount and lower retail distribution channel selling expenses of
approximately $2.2 million resulting from lower retail sales. Selling expenses
as a percentage of net revenues were constant at approximately 14.3%.

     General and administrative expenses decreased 25.9% to $133.0 million for
1998 compared to $179.6 million for 1997 and decreased as a percentage of net
revenues to 31.1% for 1998 from 36.5% for 1997. The decrease primarily resulted
from reduced bad debt expense of $27.8 million due to improvements in
MobileMedia's billing and collections functions, lower administrative telephone
expenses of $7.0 million resulting from lower call volume and lower long
distance rates as of October 1, 1997 and lower customer service and retail
activation expenses of $9.7 million primarily resulting from lower headcount.

     Reduction of liabilities subject to compromise was $10.5 million for the
year ended December 31, 1998. See note 2 to MobileMedia's consolidated financial
statements.

     Restructuring costs decreased from $19.8 million for 1997 to $18.6 million
for 1998 due to a decline in professional fees incurred by MobileMedia as a
result of the bankruptcy filing on January 30, 1997.

     Depreciation and amortization decreased 17.0% to $116.5 million for 1998
compared to $140.2 million for 1997. The decrease was primarily due to lower
pager depreciation attributable to a reduced depreciable base of pager assets
resulting from the change in useful life from four to three years on October 1,
1997 and decreased pager purchases. As a percentage of net revenues,
depreciation and amortization expense decreased to 27.2% for 1998 from 28.5% for
1997.

     Amortization of deferred gain on tower sale was $1.6 million for 1998. See
note 3 to MobileMedia's consolidated financial statements.

     Operating loss decreased 97.8% to $1.2 million for 1998 from $57.0 million
for 1997. The decrease was primarily due to decreased operating expenses.

                                       102
<PAGE>   113

     Interest expense decreased 21.5% to $53.0 million for 1998 compared to
$67.6 million for 1997. The decrease was primarily due to lower interest expense
on MobileMedia's debtor-in-possession credit facility resulting from lower
outstanding borrowings in 1998.

     Gain on sale of assets increased to $93.8 million for 1998 primarily as a
result of the sale of transmission towers and related equipment. See note 3 to
MobileMedia's consolidated financial statements.

     Income (loss) from continuing operations before income tax provision, as a
result of the above factors, increased to income of $39.5 million for 1998
compared to a loss of $124.6 million for 1997.

     Income tax provision increased to $4.0 million for 1998 primarily as a
result of the sale of transmission towers.

  Year Ended December 31, 1997 Compared with Year Ended December 31, 1996

     The following table presents selected items from MobileMedia's consolidated
statement of operations and selected other information for the periods
indicated:

<TABLE>
<CAPTION>
                                                                    YEAR ENDED DECEMBER 31,
                                                       -------------------------------------------------
                                                                 1996                      1997
                                                       ------------------------    ---------------------
                                                        (IN THOUSANDS, EXCEPT PERCENTAGE AND UNIT DATA)
<S>                                                    <C>             <C>         <C>           <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA
Revenues
  Services, rents and maintenance....................   $   568,892      100.1%     $ 491,174      99.9%
  Equipment sales and activation fees................        71,818       12.7         36,218       7.4
                                                        -----------     ------      ---------     -----
Total revenues.......................................       640,710      112.8        527,392     107.3
  Cost of products sold..............................       (72,595)     (12.8)       (35,843)     (7.3)
                                                        -----------     ------      ---------     -----
                                                            568,115      100.0        491,549     100.0
Operating expenses
  Services, rents and maintenance....................       144,050       25.4        139,333      28.3
  Selling............................................        96,817       17.0         69,544      14.2
  General and administrative.........................       218,607       38.5        179,599      36.5
  Impairment of long-lived assets....................       792,478      139.5             --        --
  Restructuring costs................................         4,256        0.7         19,811       4.0
  Depreciation and amortization......................       348,698       61.4        140,238      28.6
                                                        -----------     ------      ---------     -----
Total operating expenses.............................     1,604,906      282.5        548,525     111.6
                                                        -----------     ------      ---------     -----
Operating loss.......................................    (1,036,791)    (182.5)       (56,976)    (11.6)
Total other expense..................................       (92,595)     (16.2)       (67,608)    (13.7)
                                                        -----------     ------      ---------     -----
Loss before income tax benefit.......................    (1,129,386)    (198.7)      (124,584)    (25.3)
Income tax benefit...................................       (69,442)      12.2             --        --
                                                        -----------     ------      ---------     -----
Net loss.............................................   $(1,059,944)    (186.5)%    $(124,584)    (25.3)%
                                                        ===========     ======      =========     =====
OTHER DATA
MobileMedia adjusted EBITDA..........................   $   108,641       19.1%     $ 103,073      21.0%
Cash flows provided by operating activities..........   $    57,194                 $  14,920
Cash flows used in investing activities..............   $(1,028,321)                $ (40,556)
Cash flows provided by financing activities..........   $   586,111                 $  13,396
ARPU.................................................   $     11.08                 $   10.41
Average monthly operating expense per unit(1)........   $      8.95                 $    8.23
Units in service (at end of period)..................     4,424,107                 3,440,342
</TABLE>

- ---------------
(1) Does not include impact of $792.5 million asset impairment writedown in
    1996.

                                       103
<PAGE>   114

     Units in service decreased from 4,424,107 as of December 31, 1996 to
3,440,342 as of December 31, 1997, a decrease of 22.2%. The decrease was
attributable to a decrease in gross unit additions and an increase in unit
cancellations primarily resulting from acquisition integration difficulties,
billing system clean up to remove non-revenue generating units and cancellation
of units for non-payment.

     Services, rents and maintenance revenues decreased 13.7% to $491.2 million
for 1997 compared to $568.9 million for 1996 due to fewer units in service and
lower ARPU. ARPU decreased to $10.41 for 1997 from $11.08 for 1996 largely due
to continued competitive market conditions.

     Equipment sales and activation fees decreased 49.6% to $36.2 million for
1997 compared to $71.8 million for 1996. The decrease in equipment sales was
primarily attributable to less equipment sold through the retail distribution
channel. Equipment sales and activation fees, less cost of products sold,
increased from $(0.8) million for 1996 to $0.4 million for 1997 primarily as a
result of lower retail sales of equipment sold at a discount. Cost of products
sold for 1996 included a writedown of $3.2 million, reflecting the establishment
of a lower of cost or market reserve for units held for resale through
MobileMedia's retail and reseller distribution channels.

     Net revenues decreased 13.5% to $491.5 million for 1997 compared to $568.1
million for 1996.

     Services, rents and maintenance expenses decreased 3.3% to $139.3 million
for 1997 compared to $144.1 million for 1996, primarily due to billing
reconciliation and lower nationwide subcontracted paging expenses resulting from
cancellations and customer migration from networks not owned by MobileMedia to
company-owned networks.

     Selling expenses for 1997 decreased 28.2% to $69.5 million from $96.8
million for 1996 primarily due to lower sales personnel costs and lower sales
commissions attributable to lower sales headcount and lower gross additions. In
addition, reseller and retail distribution channel selling expenses declined as
a result of lower sales volume. Selling expenses as a percentage of net revenue
decreased to 14.2% for 1997 from 17.0% for 1996.

     General and administrative expenses decreased 17.8% to $179.6 million for
1997 compared to $218.6 million for 1996. General and administrative expenses
decreased as a percentage of net revenues to 36.5% for 1997 from 38.5% for 1996
primarily due to decreased bad debt expense, customer service expenses related
to the assimilation of MobileComm's customer service functions, and consulting
fees related to the integration of the acquisitions. Bad debt expense decreased
as a result of increased collections resulting from improvements in
MobileMedia's billing and collection functions.

     Restructuring costs increased from $4.2 million for 1996 to $19.8 million
for 1997 due to professional fees constituting administrative expenses incurred
by MobileMedia as a result of the bankruptcy filing on January 30, 1997 as
compared to the 1996 expenses incurred in connection with MobileMedia's attempt
to restructure its debt.

     Depreciation and amortization decreased 59.8% to $140.2 million for 1997
compared to $348.7 million for 1996. The decrease was primarily due to a
writedown of impaired assets by $792.5 million pursuant to Statement of
Financial Standards No. 121, "Accounting for the Impairment of Long-Lived Assets
and Long-Lived Assets to be Disposed Of" effective December 31, 1996, as
described in note 2 to MobileMedia's consolidated financial statements,
amortization of a non-competition agreement related to its MobileComm
acquisition which was fully amortized in 1996 and decreased pager depreciation
resulting from a decrease in expenses related to unrecoverable subscriber
equipment and a reserve established to lower book values of certain pager models
to current market values in 1996. As a percentage of net revenues, depreciation
and amortization expense decreased to 28.6% for 1997 from 61.4% for 1996.

     Operating loss decreased to $57.0 million for 1997 from $1,036.8 million
for 1996. The decrease was primarily due to the $792.5 million asset impairment
writedown effective December 31, 1996 and other factors indicated above.

     Total other expense, principally interest expense, decreased 27.0% to $67.6
million for 1997 compared to $92.6 million for 1996. The decrease was primarily
due to interest expense related to MobileMedia's
                                       104
<PAGE>   115

$250.0 million senior subordinated notes due November 1, 2007 and $210.0 million
senior subordinated deferred coupon notes not being recognized subsequent to the
bankruptcy filing on January 30, 1997.

     Loss before income tax benefit, as a result of the above factors, decreased
to $124.6 million for 1997 from $1,129.4 million for 1996.

     Income tax benefit of $69.4 million resulted from the deferred tax
adjustment attributable to the $792.5 asset impairment writedown effective
December 31, 1996.

LIQUIDITY AND CAPITAL RESOURCES

     MobileMedia's operations and strategy required the availability of
substantial funds to finance the development and installation of wireless
communications systems, to procure subscriber equipment and to service debt.
Historically, these requirements were funded by net cash from operating
activities, additional borrowings and capital contributions from its former
parent company. Following the MobileMedia acquisition, Arch has had to supply
these requirements for MobileMedia. See "Arch Management's Discussion and
Analysis of Financial Condition and Results of Operations -- Liquidity and
Capital Resources".

  Chapter 11 Filing and Related Matters

     On January 30, 1997, MobileMedia and affiliates filed voluntary petitions
for relief under the Bankruptcy Code in order to implement an operational and
financial restructuring. Until consummation of the MobileMedia acquisition, they
operated their businesses as debtors-in-possession subject to the jurisdiction
of the bankruptcy court. In January 1997, the bankruptcy court approved payment
of a total of $47.4 million of the pre-petition claims of MobileMedia's key
suppliers, Motorola, Glenayre, NEC and Panasonic. MobileMedia also entered into
supply agreements with each of the key suppliers. Chase Manhattan Bank and
certain other financial institutions initially provided MobileMedia with up to
$200.0 million of debtor-in-possession financing during its Chapter 11
proceedings.

  Capital Expenditures and Commitments

     Capital expenditures were $26.8 million for the three months ended March
31, 1999 compared to $4.9 million for the three months ended March 31, 1998 and
$53.9 million for the year ended December 31, 1998 compared to $40.6 million for
the year ended December 31, 1997. Capital expenditures increased $21.9 million
for the three months ended March 31, 1999 compared to the three-month period
ended March 31, 1998 primarily as a result of increased pager purchases, and
$13.3 million for the 1998 year compared to the 1997 year principally as a
result of capital spending for the construction of a nationwide N-PCS network.

  Sources of Funds

     MobileMedia's net cash provided by operating activities was $17.6 million
for the three months ended March 31, 1999 compared to $19.5 million for the
three months ended March 31, 1998. Inventories decreased $0.6 million from
December 31, 1998 to March 31, 1999 compared to a decrease of $0.4 million from
December 31, 1997 to March 31, 1998 as a result of utilizing pager inventory
stock and lower sales volume in the retail sales distribution channel. Accounts
payable, accrued expenses and other liabilities decreased $2.0 million from
December 31, 1998 to March 31, 1999 compared to a increase of $1.4 million from
December 31, 1997 to March 31, 1998. Net accounts receivable decreased $1.7
million from December 31, 1998 to March 31, 1999 compared to a decrease of $7.8
million from December 31, 1997 to March 31, 1998 primarily due to collections of
past due accounts receivable in the first quarter of 1998.

     MobileMedia's net cash provided by operating activities was $54.5 million
for the year ended December 31, 1998 compared to $14.9 million for the year
ended December 31, 1997. Inventories increased $1.3 million from December 31,
1997 to December 31, 1998 as a result of additional pagers purchased for sale
through the retail sales distribution channel. Accounts payable, accrued
expenses and

                                       105
<PAGE>   116

other liabilities decreased $7.1 million from $156.4 million as of December 31,
1997 to $149.3 million as of December 31, 1998. Net accounts receivable
decreased $16.5 million from $55.4 million as of December 31, 1997 to $38.9
million as of December 31, 1998 due to improved billing and collections
functions.

  Tower Sale

     On September 3, 1998, MobileMedia completed the sale of 166 transmission
towers for $170.0 million in cash. Under the terms of a 15-year lease with the
buyer, MobileMedia continues to own and utilize transmitters, antennas and other
equipment located on these towers at an aggregate annual rental of $10.7
million. The sale was accounted for in accordance with Statement of Financial
Accounting Standards No. 28, Accounting for Sales with Leasebacks, and resulted
in a recognized gain of $94.2 million and a deferred gain of $70.0 million. The
deferred gain will be amortized over the initial lease period of 15 years. After
the sale, MobileMedia distributed the $170.0 million in proceeds to its secured
creditors, who had a lien on the towers.

  Debt Obligations

     In addition to the debtor-in-possession credit facility, the debt
obligations of MobileMedia during the periods described above also included the
following:

     MobileMedia's 1995 credit facility provided for $750.0 million senior
secured and guaranteed credit facility with a syndicate of lenders including The
Chase Manhattan Bank. This became available on December 4, 1995, in connection
with the financing of the MobileComm acquisition. Commencing in 1996,
MobileMedia was in default under this facility. As a result of such default and
the bankruptcy filing, MobileMedia had no borrowing capacity under this
facility. After filing under Chapter 11, MobileMedia brought current its
interest payments and made monthly adequate protection payments to the lenders
under the 1995 credit facility equal to the amount of interest accruing under
such agreement. On September 3, 1998, MobleMedia repaid $170.0 million of
borrowings under its 1995 credit facility using proceeds from the sale of 166
transmission towers.

     MobleMedia issued $250.0 million senior subordinated 9 3/8% notes in
November 1995, concurrent with MobileMedia's second offering of Class A common
stock. See note 11 to MobileMedia's consolidated financial statements. These
notes bore interest at a rate of 9 3/8% payable semiannually on May 1 and
November 1 of each year. On November 1, 1996, MobileMedia did not make its
scheduled interest payment on the 9 3/8% notes which constituted an event of
default under the indenture.

     MobleMedia issued $210.0 million of senior subordinated deferred coupon
notes, at a discount, in November 1993. These deferred coupon notes accreted at
a rate of 10.5%, compounded semiannually, to an aggregate principal amount of
$210.0 million by December 1, 1998 after which interest was payable in cash at a
rate of 10.5% and was payable semiannually.

LITIGATION CONTINGENCIES

     MobileMedia disclosed in 1996 that misrepresentations and other violations
had occurred during the licensing process for as many as 400 to 500, or
approximately 6% to 7%, of its approximately 8,000 local transmission one-way
paging stations. On January 13, 1997, the FCC announced that it had (1)
automatically terminated approximately 185 authorizations for paging facilities
that were not constructed by the expiration date of their construction permits
and remained unconstructed, (2) dismissed approximately 94 applications for
fill-in sites around existing paging stations (which had been filed under the
so-called "40-mile rule") as defective because they were predicated upon
unconstructed facilities and (3) automatically terminated approximately 99 other
authorizations for paging facilities that were apparently constructed after the
expiration date of their construction permits. With respect to each of these
approximately 99 authorizations where the underlying station was apparently
untimely constructed, the FCC granted MobileMedia interim operating authority
subject to further action by the FCC. On February 5, 1999, the FCC released an
order granting its consent to the transfer of control of
                                       106
<PAGE>   117

MobileMedia to Arch; however, the order conditioned the FCC's consent on Arch
coming into compliance with the N-PCS spectrum aggregation limit contained in
Section 24.101(a) of the FCC's rules by December 3, 1999. The order also
required Arch to terminate the 99 MobileMedia facilities operating under interim
operating authority within six months of consummating the merger (December 3,
1999).

     Since February 5, 1999, Arch has resolved all of the issues related to the
99 facilities operating pursuant to interim operating authority. Specifically,
Arch has determined that (1) 28 of the 99 authorizations were for facilities
that were wholly encompassed by existing, authorized contour and were therefore
properly authorized facilities that did not need to be terminated; (2) 66 of the
99 authorizations were for facilities that were never constructed or were not
being used and were therefore properly terminated; (3) three of the
authorizations were for facilities that Arch has since filed for and obtained
permanent authority to operate; and (4) on November 23, 1999, the FCC granted
Arch interim operating authority to continue operating two facilities until 90
days after Arch is notified by the winner of the geographic area licenses
encompassing the two facilities that the auction winner wants to provide service
on the frequencies Arch is operating pursuant to interim operating authority. If
Arch is the winner of the two geographic area licenses encompassing its two
facilities, Arch will not need to terminate service.

     On December 3, 1999, Arch notified the FCC that, in accordance with the
FCC's February 5, 1999 order, it had come into compliance with the N-PCS
spectrum aggregation limit.

NEW AUTHORITATIVE ACCOUNTING PRONOUNCEMENTS

     See "Arch Management's Discussion and Analysis of Financial Condition and
Results of Operations" for a description of new accounting pronouncements.
Management does not believe that MobileMedia's adoption of SFAS No. 130, SFAS
No. 131 and SOP 98-5 has had or will have any material effects.

                                       107
<PAGE>   118

    SELECTED HISTORICAL CONSOLIDATED FINANCIAL AND OPERATING DATA -- PAGENET

     The following table sets forth selected historical consolidated financial
and operating data of PageNet as of and for the years ended December 31, 1994,
1995, 1996, 1997, and 1998, for the nine months ended September 30, 1998 and
1999, and as of September 30, 1999. The selected financial and operating data as
of December 31, 1994, 1995, 1996, 1997, and 1998 and for each of the five years
ended December 31, 1998, has been derived from PageNet's audited consolidated
financial statements and notes. The selected financial and operating data for
the nine months ended September 30, 1998 and 1999, and as of September 30, 1999,
has been derived from PageNet's unaudited consolidated financial statements and
notes. You should read the following consolidated financial information in
conjunction with "PageNet Management's Discussion and Analysis of Financial
Condition and Results of Operations" and PageNet's consolidated financial
statements and notes.

     The provision for asset impairment for the nine months ended September 30,
1999, represents a charge for the impairment of the assets of PageNet's
majority-owned Spanish subsidiaries. The restructuring charge for the year ended
December 31, 1998, and the nine months ended September 30, 1998, represents a
charge primarily for the abandonment of facilities and property and related
severance costs associated with the reorganization of PageNet's domestic
operations. The non-recurring charge for the year ended December 31, 1996
represents a provision to write off subscriber devices leased by PageNet to
customers under an agreement with a national marketing affiliate. The
non-recurring charge for the year ended December 31, 1997, represents a
provision to write down certain subscriber devices to their net realizable
value. The extraordinary item for the year ended December 31, 1997, represents
the loss on the early retirement of all $200 million of PageNet's outstanding
11.75% senior subordinated notes in May 1997. The cumulative effect of a change
in accounting principle for the nine months ended September 30, 1999, represents
the write-off of all remaining unamortized start-up costs as of January 1, 1999,
upon the adoption of AICPA Statement of Position 98-5 "Reporting on the Costs of
Start-Up Activities". Effective April 1, 1999, PageNet changed the depreciable
lives for its subscriber devices and a portion of its network equipment. As a
result of these changes, depreciation expense increased by approximately $77
million during the nine months ended September 30, 1999. Further discussion of
these items is included in "PageNet Management's Discussion and Analysis of
Financial Condition and Results of Operations" and PageNet's consolidated
financial statements and notes.

     Earnings before interest, income taxes, depreciation, and amortization
(EBITDA) is commonly used by analysts and investors as a principal measure of
financial performance in the wireless messaging industry. EBITDA is also one of
the primary financial measures used to calculate whether PageNet and its
subsidiaries are in compliance with financial covenants under their debt
agreements. These covenants, among other things, limit the ability of PageNet
and its subsidiaries to: incur additional indebtedness, advance funds to some of
PageNet's affiliates, pay dividends, grant liens on its assets, merge, sell or
acquire assets, repurchase or redeem capital stock, incur capital expenditures
and prepay certain indebtedness. EBITDA is also one of the financial measures
used by analysts to value PageNet. Therefore, PageNet's management believes that
the presentation of EBITDA provides relevant information to investors. Adjusted
EBITDA, as determined by PageNet, does not reflect minority interest, equity in
loss of an unconsolidated subsidiary, provision for asset impairment,
restructuring charge, non-recurring charges, extraordinary items, and cumulative
effect of a change in accounting principle; consequently Adjusted EBITDA may not
necessarily be comparable to similarly titled data of other wireless messaging
companies. EBITDA and Adjusted EBITDA should not be construed as an alternative
to operating income or cash flows from operating activities as determined in
accordance with GAAP or as a measure of liquidity. Amounts reflected as EBITDA
or Adjusted EBITDA are not necessarily available for discretionary use as a
result of restrictions imposed by the terms of existing indebtedness and
limitations imposed by applicable law upon the payment of dividends or
distributions, among other things. See "PageNet Management's Discussion and
Analysis of Financial Condition and Results of Operations".

                                       108
<PAGE>   119

     Adjusted EBITDA margin is calculated by dividing PageNet Adjusted EBITDA by
total revenues less cost of products sold. EBITDA margin is a measure commonly
used in the wireless messaging industry to evaluate a company's EBITDA relative
to total revenues less cost of products sold as an indicator of the efficiency
of a company's operating structure.

<TABLE>
<CAPTION>
                                                                                                             (UNAUDITED)
                                                                                                          NINE MONTHS ENDED
                                                         YEAR ENDED DECEMBER 31,                            SEPTEMBER 30,
                                     ---------------------------------------------------------------   -----------------------
                                        1994         1995        1996         1997          1998          1998         1999
                                     ----------   ----------   ---------   -----------   -----------   -----------   ---------
                                                (DOLLARS IN THOUSANDS, EXCEPT PERCENTAGE, PER SHARE AND UNIT DATA)
<S>                                  <C>          <C>          <C>         <C>           <C>           <C>           <C>
CONSOLIDATED STATEMENT OF
  OPERATIONS DATA:
Services, rent and maintenance
revenues...........................  $  389,919   $  532,079   $ 685,960   $   818,461   $   945,524   $   704,722   $ 696,566
Product sales......................      99,765      113,943     136,527       142,515       100,503        80,600      68,969
                                     ----------   ----------   ---------   -----------   -----------   -----------   ---------
Total revenues.....................     489,684      646,022     822,487       960,976     1,046,027       785,322     765,535
Cost of products sold..............     (78,102)     (93,414)   (116,647)     (121,487)      (77,672)      (62,540)    (43,013)
                                     ----------   ----------   ---------   -----------   -----------   -----------   ---------
                                        411,582      552,608     705,840       839,489       968,355       722,782     722,522
Services, rent and maintenance
  expenses.........................      74,453      109,484     146,896       173,058       210,480       158,011     193,705
Selling expenses...................      60,555       67,561      82,790       102,995       104,350        72,320      70,223
General and administrative
  expenses.........................     136,539      174,432     219,317       253,886       320,586       224,035     260,877
Depreciation and amortization
  expense..........................     107,362      148,997     213,440       289,442       281,259       213,220     268,171
Provision for asset impairment.....          --           --          --            --            --            --      17,798
Restructuring charge...............          --           --          --            --        74,000        74,000          --
Non-recurring charges..............          --           --      22,500        12,600            --            --          --
                                     ----------   ----------   ---------   -----------   -----------   -----------   ---------
Total operating expenses...........     378,909      500,474     684,943       831,981       990,675       741,586     810,774
                                     ----------   ----------   ---------   -----------   -----------   -----------   ---------
Operating income (loss)............      32,673       52,134      20,897         7,508       (22,320)      (18,804)    (88,252)
Interest expense...................     (53,717)    (102,846)   (128,014)     (151,380)     (143,762)     (109,353)   (111,097)
Interest income....................       3,079        6,511       3,679         3,689         2,070         1,564       1,986
Minority interest..................          --           --          41            56         2,003         2,174         806
Equity in loss of an unconsolidated
  subsidiary.......................          --           --        (923)       (1,276)           --            --          --
                                     ----------   ----------   ---------   -----------   -----------   -----------   ---------
Loss before extraordinary item and
  cumulative effect of a change in
  accounting principle.............     (17,965)     (44,201)   (104,320)     (141,403)     (162,009)     (124,419)   (196,557)
Extraordinary item.................          --           --          --       (15,544)           --            --          --
Cumulative effect of a change in
  accounting principle.............          --           --          --            --            --            --     (37,446)
                                     ----------   ----------   ---------   -----------   -----------   -----------   ---------
Net loss...........................  $  (17,965)  $  (44,201)  $(104,320)  $  (156,947)  $  (162,009)  $  (124,419)  $(234,003)
                                     ==========   ==========   =========   ===========   ===========   ===========   =========
Per common share data (basic and
  diluted):
  Loss before extraordinary item
    and cumulative effect of a
    change in accounting
    principle......................  $    (0.18)  $    (0.43)  $   (1.02)  $     (1.38)  $     (1.57)  $     (1.20)  $   (1.89)
  Extraordinary item...............          --           --          --         (0.15)           --            --          --
  Cumulative effect of a change in
    accounting principle...........          --           --          --            --            --            --       (0.36)
                                     ----------   ----------   ---------   -----------   -----------   -----------   ---------
  Net loss per share...............  $    (0.18)  $    (0.43)  $   (1.02)  $     (1.53)  $     (1.57)  $     (1.20)  $   (2.25)
                                     ==========   ==========   =========   ===========   ===========   ===========   =========
OTHER OPERATING DATA:
EBITDA.............................  $  140,035   $  201,131   $ 233,455   $   280,186   $   260,942   $   196,590   $ 143,279
Adjusted EBITDA....................     140,035      201,131     256,837       309,550       332,939       268,416     197,717
Adjusted EBITDA margin.............       34.0%        36.4%       36.4%         36.9%         34.4%         37.1%       27.4%
Free cash flow (1).................    (123,911)    (207,493)   (304,886)     (166,506)     (105,794)      (10,668)    (74,224)
Capital expenditures...............     213,308      312,289     437,388       328,365       297,041       171,295     162,830
Cash flows provided by operating
  activities.......................     107,744      160,629     110,382       150,503       276,959       190,744      89,016
Cash flows used in investing
  activities.......................    (260,839)    (589,387)   (601,122)     (459,929)     (314,444)     (172,994)   (175,712)
</TABLE>

                                       109
<PAGE>   120

<TABLE>
<CAPTION>
                                                                                                             (UNAUDITED)
                                                                                                          NINE MONTHS ENDED
                                                         YEAR ENDED DECEMBER 31,                            SEPTEMBER 30,
                                     ---------------------------------------------------------------   -----------------------
                                        1994         1995        1996         1997          1998          1998         1999
                                     ----------   ----------   ---------   -----------   -----------   -----------   ---------
                                                (DOLLARS IN THOUSANDS, EXCEPT PERCENTAGE, PER SHARE AND UNIT DATA)
<S>                                  <C>          <C>          <C>         <C>           <C>           <C>           <C>
Cash flows provided by (used in)
financing activities...............     153,055      624,489     296,335       308,573        37,638        (6,590)    186,580
Units in service at end of
  period...........................   4,409,000    6,738,000   8,588,000    10,344,000    10,110,000    10,484,000   9,314,000
</TABLE>

<TABLE>
<CAPTION>
                                                                                                                 (UNAUDITED)
                                                                      AS OF DECEMBER 31,                            AS OF
                                                  -----------------------------------------------------------   SEPTEMBER 30,
                                                   1994        1995         1996         1997         1998          1999
                                                  -------   ----------   ----------   ----------   ----------   -------------
                                                                                (IN THOUSANDS)
<S>                                               <C>       <C>          <C>          <C>          <C>          <C>
BALANCE SHEET DATA:
Current assets..................................  $39,375   $  259,096   $   95,550   $  105,214   $  108,961    $  203,475
Total assets....................................  706,008    1,228,338    1,439,613    1,597,233    1,581,244     1,520,885
Long-term obligations, less current
  maturities....................................  504,000    1,150,000    1,459,188    1,779,491    1,815,137     1,999,320
Total shareowners' deficit......................  (39,908)     (80,784)    (182,175)    (337,931)    (490,419)     (724,424)
</TABLE>

- ---------------
(1) Free cash flow is defined by PageNet as Adjusted EBITDA less capital
    expenditures (excluding payments for spectrum licenses) and debt service
    (interest expense net of interest income).

     The following table reconciles PageNet's net loss to EBITDA and Adjusted
EBITDA:

<TABLE>
<CAPTION>
                                                                                                            (UNAUDITED)
                                                                                                         NINE MONTHS ENDED
                                                             YEAR ENDED DECEMBER 31,                       SEPTEMBER 30,
                                             -------------------------------------------------------   ---------------------
                                               1994       1995       1996        1997        1998        1998        1999
                                             --------   --------   ---------   ---------   ---------   ---------   ---------
                                                                             (IN THOUSANDS)
<S>                                          <C>        <C>        <C>         <C>         <C>         <C>         <C>
Net loss...................................  $(17,965)  $(44,201)  $(104,320)  $(156,947)  $(162,009)  $(124,419)  $(234,003)
Interest expense...........................    53,717    102,846     128,014     151,380     143,762     109,353     111,097
Interest income............................    (3,079)    (6,511)     (3,679)     (3,689)     (2,070)     (1,564)     (1,986)
Depreciation and amortization expense......   107,362    148,997     213,440     289,442     281,259     213,220     268,171
                                             --------   --------   ---------   ---------   ---------   ---------   ---------
EBITDA.....................................   140,035    201,131     233,455     280,186     260,942     196,590     143,279
Minority interest..........................        --         --         (41)        (56)     (2,003)     (2,174)       (806)
Equity in loss of an unconsolidated
  subsidiary...............................        --         --         923       1,276          --          --          --
Provision for asset impairment.............        --         --          --          --          --          --      17,798
Restructuring charge.......................        --         --          --          --      74,000      74,000          --
Non-recurring charges......................        --         --      22,500      12,600          --          --          --
Extraordinary item.........................        --         --          --      15,544          --          --          --
Cumulative effective of a change in
  accounting principle.....................        --         --          --          --          --          --      37,446
                                             --------   --------   ---------   ---------   ---------   ---------   ---------
Adjusted EBITDA............................  $140,035   $201,131   $ 256,837   $ 309,550   $ 332,939   $ 268,416   $ 197,717
                                             ========   ========   =========   =========   =========   =========   =========
</TABLE>

                                       110
<PAGE>   121

           PAGENET MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                      CONDITION AND RESULTS OF OPERATIONS

INTRODUCTION

     You should read the following discussion and analysis in conjunction with
PageNet's consolidated financial statements and notes.

     PageNet's compliance with the financial covenants in its bank credit
agreement depends upon improvement in PageNet's domestic EBITDA for the fourth
quarter of 1999, which is not anticipated. Therefore, it is likely that PageNet
will no longer be in compliance with the covenants of its credit agreement upon
the finalization of its financial results for the fourth quarter of 1999. If
PageNet is not in compliance with its debt covenants, PageNet would seek to
obtain a waiver or deferral of any action by the lenders for such noncompliance
under the credit agreement. If PageNet is unable to obtain such a waiver or
deferral, the lenders could demand that PageNet immediately pay all indebtedness
outstanding under the credit agreement. This demand would cause PageNet to be in
default under the PageNet senior subordinated notes.

     The terms of PageNet's senior subordinated notes prevent PageNet from
borrowing any more money. As of December 31, 1999, PageNet had approximately $28
million in cash. Interest payments of approximately $34 million are due by
PageNet on February 1, 2000 under the terms of PageNet's 10.125% and 8.875%
senior subordinated notes. PageNet does not expect to make such interest
payments. PageNet believes that its cash, plus the cash expected to be generated
from operations, is sufficient to meet its other obligations through the first
quarter of 2000. However, if PageNet does not improve its domestic EBITDA,
PageNet may not have enough cash to meet its obligations through the first
quarter of 2000 or thereafter. PageNet is considering several alternatives to
ensure that it has sufficient liquidity through the completion of the merger.
However, there can be no guarantees that PageNet's efforts to obtain additional
liquidity will be timely or successful or that the merger will be completed.
PageNet may have to reduce the level of its operations and/or file for
protection under chapter 11 of the Bankruptcy Code to restructure its
obligations. Further, under the terms of the bank credit agreement and the
indentures governing the PageNet notes, the bank lenders or the note holders
will have the right, subject to applicable notice and grace periods, to
accelerate the outstanding indebtedness and to institute an involuntary
bankruptcy proceeding against the company following the non-payment of interest
on the senior subordinated notes, violation of a covenant of the bank credit
agreement, or certain other events. A bankruptcy filing would be likely to have
a material impact on PageNet's results of operations and financial position. In
addition, if the merger is not completed, PageNet may incur significant chargers
for asset impairments and restructuring its operations.

     For more information, see "Liquidity and Capital Resources" on page 117.

     PageNet continues to implement its previously announced restructuring to
eliminate redundant administrative operations by consolidating key support
functions. While progress has been made, PageNet's efforts to convert its
offices to its new billing and customer service software platforms are behind
its original schedule. PageNet planned for the conversions to be substantially
completed during early 1999. PageNet now plans to continue to implement the
restructuring through January 2000, by which time it expects to have converted
100% of its customer units placed in service by its resellers and approximately
50% of its direct customer units to its centralized centers of excellence
operating platforms. Thereafter, PageNet plans to suspend conversions of
additional customers to these platforms pending the decision of the combined
company with respect to the operating platforms to be used going forward after
the merger. As result, PageNet will realize a portion of the anticipated cost
savings resulting from its centers of excellence initiative and will eliminate
some of the duplicative costs that have adversely affected its results from
operations. However, due to the suspension of future conversions, combined with
the impact of the contemplated merger on operations, PageNet is unable to
determine the amount of potential cost savings resulting from the centers of
excellence initiative.

                                       111
<PAGE>   122

     PageNet also has made progress in expanding its advanced wireless network.
PageNet expects the expansion to be completed in January 2000. The expansion
will allow PageNet to more effectively offer a broad variety of wireless
information products and services. In April 1999, PageNet completed a
realignment of its sales and marketing organizations. This realignment is
intended to focus PageNet's sales and marketing organizations on customer needs
and PageNet's overall strategy.

     In June 1999, PageNet announced the establishment of its Vast Solutions
division in order to provide a focus and dedicated resources towards developing
a suite of new wireless solutions. Vast is currently developing the following
new services: (1) the provision of gateway services, which use a single,
transparent "bridge" between different wireless networks, protocols and data
management systems, to enable customers and their employees to receive data
across multiple network technologies, (2) customized wireless information
management services for its corporate clients which involve integrated software
and hardware systems that allow access to vital company information from a
variety of sources, including company intranets, remote industrial assets, or
mobile employees, and (3) content and information services designed to bring a
wide variety of information to its customers' messaging devices from third party
providers and the internet. PageNet formed dedicated groups to launch these
services in 1998, and placed these groups under the umbrella of Vast beginning
in June of 1999. Vast is a development stage company and, since its inception,
has been engaged primarily in product research and development and developing
markets for its products and services. Vast has incurred significant operating
losses as a result of its start-up activities. It began to market its products
and services in late 1999, and believes that revenue from sales of these
products and services will grow rapidly.

RESULTS OF OPERATIONS

     The following table presents selected items from PageNet's consolidated
statements of operations as a percentage of net revenues and certain other items
for the periods indicated. Net revenues are revenues from services, rent and
maintenance plus product sales less the cost of products sold.

<TABLE>
<CAPTION>
                                                                                 NINE MONTHS
                                                                                    ENDED
                                                     YEAR ENDED DECEMBER 31,    SEPTEMBER 30,
                                                     -----------------------    --------------
                                                     1996     1997     1998     1998     1999
                                                     -----    -----    -----    -----    -----
<S>                                                  <C>      <C>      <C>      <C>      <C>
Net Revenues.......................................  100.0%   100.0%   100.0%   100.0%   100.0%
Operating expenses:
  Services, rent and maintenance...................   20.8     20.6     21.7     21.9     26.8
  Selling..........................................   11.7     12.3     10.8     10.0      9.7
  General and administrative.......................   31.1     30.2     33.1     31.0     36.1
  Depreciation and amortization....................   30.2     34.5     29.1     29.5     37.1
  Provision for asset impairment...................     --       --       --       --      2.5
  Restructuring charge.............................     --       --      7.6     10.2       --
  Non-recurring charges............................    3.2      1.5       --       --       --
                                                     -----    -----    -----    -----    -----
Operating income (loss)............................    3.0      0.9     (2.3)    (2.6)   (12.2)
Net loss...........................................  (14.8)   (18.7)   (16.7)   (17.2)   (32.4)
EBITDA.............................................   33.1     33.4     26.9     27.2     19.8
Adjusted EBITDA....................................   36.4     36.9     34.4     37.1     27.4
</TABLE>

     EBITDA is a commonly used measure of financial performance in the wireless
messaging industry and is one of the financial measures used to calculate
whether PageNet is in compliance with the financial covenants under its debt
agreements. EBITDA is defined as earnings before interest, income taxes,
depreciation, and amortization.

     Adjusted EBITDA is defined as earnings before interest, income taxes,
depreciation, amortization, minority interest, equity in loss of an
unconsolidated subsidiary, provision for asset impairment, restructuring charge,
non-recurring charges, extraordinary items, and cumulative effect of a change in
accounting principle. One of PageNet's financial objectives is to increase its
adjusted EBITDA, since adjusted EBITDA is a significant source of funds for
servicing indebtedness and for investment in

                                       112
<PAGE>   123

continued growth, including purchase of paging units and paging system equipment
and the construction and expansion of paging systems. Free cash flow is defined
as adjusted EBITDA less capital expenditures, excluding payments for spectrum
license, and debt service. Another of PageNet's financial objectives is to
increase its free cash flow, since free cash flow represents the adjusted EBITDA
remaining after capital expenditures and debt service costs. Adjusted EBITDA and
free cash flow, as determined by PageNet, may not be comparable to similarly
titled data of other wireless messaging companies. Amounts described as adjusted
EBITDA and free cash flow are not necessarily available for discretionary use as
a result of restrictions imposed by the terms of existing or future
indebtedness, including the repayment of such indebtedness or the payment of
associated interest, limitations imposed by law upon the payment of dividends or
distributions or capital expenditure requirements. Adjusted EBITDA and free cash
flow should not be considered an alternative to operating income or cash flows
from operating activities as determined in accordance with GAAP.

NINE MONTHS ENDED SEPTEMBER 30, 1999 COMPARED WITH THE NINE MONTHS ENDED
SEPTEMBER 30, 1999

     Net revenues for the nine months ended September 30, 1998 and 1999, were
each $723 million. Revenues from services, rent and maintenance, which PageNet
considers its primary business, decreased 1.2% to $697 million for the nine
months ended September 30, 1999, compared to $705 million for the nine months
ended September 30, 1998. The average revenue per unit for PageNet's core
domestic operations increased to $7.96 for the nine months ended September 30,
1999, compared to $7.52 for the nine months ended September 30, 1998. However,
the increases in average revenue per unit, which resulted from the shift of
PageNet's subscriber base toward higher revenue products and services, were
offset by the decrease in revenues due to the reduction of the number of units
in service during the nine months ended September 30, 1999.

     The number of units in service with subscribers at September 30, 1999 was
approximately 9,314,000, compared to 10,110,000 and 10,484,000 units in service
with subscribers at December 31, 1998 and September 30, 1998. This reduction was
mainly due to PageNet's continued rationalization of its customer base,
intensifying price competition in the market for wireless communications
services and the degree to which broadband services, such as those with short
messaging capability built into the units, are subscribed to in lieu of one-way
messaging services such as those offered by PageNet. Approximately two-thirds of
the loss in units in service was a result of continued weakness in PageNet's
reseller channel and most of the losses of subscribers were to lower cost
services. The cancellation of units from a national account relationship and the
bankruptcy of a major reseller resulted in a loss of approximately 120,000 units
from PageNet's reseller channel. In addition, another 122,000 units were lost in
the reconciliation of PageNet's reseller account records as they were converted
to the centers of excellence platform.

     Product sales decreased 14.4% to $69 million for the nine months ended
September 30, 1999, compared to $81 million for the nine months ended September
30, 1998. The decreases in product sales and cost of products sold from 1998 to
1999 resulted primarily from PageNet's efforts to reduce the number of customers
using unprofitable services, and from increased price competition, both of which
resulted in a substantial decrease in sales through PageNet's reseller channel.
In addition, the decrease in cost of products sold from 1998 to 1999 also
resulted from the decrease in the depreciable lives of PageNet's subscriber
devices from three years to two years, effective April 1, 1999. This change had
the effect of increasing depreciation expense and thereby reducing the net book
values of sold subscriber devices.

     Services, rent and maintenance expenses increased 22.6% to $194 million for
the nine months ended September 30, 1999, compared to $158 million for the nine
months ended September 30, 1998. The increase in services, rent and maintenance
expenses for the nine months ended September 30, 1999 was primarily due to:

     - the adoption of SOP 98-5, effective January 1, 1999, which requires
       start-up costs to be expensed as incurred;

                                       113
<PAGE>   124

     - increased contracted dispatch costs related to advanced messaging units
       placed in service during 1998 and the first nine months of 1999;

     - increased pager parts and repairs expense; and

     - additional expenses associated with an increase in transmitter sites in
       connection with the buildout of its advanced messaging network.

     The increase for the nine months ended September 30, 1999 was partially
offset by the decline in the reserve for non-recoverable subscriber devices
resulting from the change in the depreciable lives of its subscriber devices
from three years to two years. Selling expenses decreased 2.9% to $70 million
for the first nine months of 1999, compared to $72 million for the first nine
months of 1998. The decrease in selling expenses for the nine months ended
September 30, 1999 was due to a one-time adjustment to sales commissions made
during the second quarter of 1999 and lower sales commissions paid in
conjunction with the net decrease in units in service as compared to the same
period of 1998. Marketing research, development costs, and advertising expenses
associated with PageNet's core and advanced messaging operations are expected to
be scaled back in future periods.

     General and administrative expenses increased 16.4% to $261 million for the
first nine months of 1999, compared to $224 million for the first nine months of
1998. The increase in general and administrative expenses was primarily related
to the centers of excellence initiative, including:

     - expenses associated with establishing PageNet's centers of excellence;

     - redundant operating costs associated with operating the new centers of
       excellence infrastructure and the traditional decentralized
       infrastructure; and

     - increased levels of contract labor utilized during the transition to the
       centers of excellence.

     Depreciation and amortization expense increased 25.8% to $268 million for
the nine months ended September 30, 1999, compared to $213 million for the nine
months ended September 30, 1998. The increase in depreciation and amortization
expense resulted primarily from PageNet's change in the depreciable lives of its
subscriber devices and certain of its network equipment, effective April 1,
1999. PageNet changed the depreciable lives of its subscriber devices from three
years to two years and the depreciable life of certain of its network equipment
from seven years to ten years. The changes resulted from PageNet's review of the
historical usage periods of its subscriber devices and its network equipment and
PageNet's expectations regarding future usage periods for subscriber devices
considering current and projected technological advances. As a result of these
changes, depreciation expense increased by approximately $77 million during the
nine months ended September 30, 1999 and is expected to increase by
approximately $3 million during the fourth quarter of 1999. PageNet also
commenced depreciation and amortization on the assets related to its centers of
excellence during the third quarter of 1999. This is expected to increase
depreciation and amortization expense during the fourth quarter of 1999 by
approximately $2 million. PageNet expects to commence depreciation and
amortization on the assets related to its advanced messaging operations during
the first quarter of 2000, which is expected to increase depreciation and
amortization expense during 2000 by approximately $25 million.

     PageNet recorded a provision of $18 million during the quarter ended March
31, 1999, for the impairment of the assets of PageNet's majority-owned Spanish
subsidiaries. See note 5 to PageNet's consolidated financial statements for the
quarter ended September 30, 1999.

     As a result of the factors outlined above, adjusted EBITDA decreased 26.3%
to $198 million for the first nine months of 1999, compared to $268 million for
the same period in 1998. Adjusted EBITDA and adjusted EBITDA as a percentage of
net revenues were negatively impacted by PageNet's advanced messaging
operations, the development and implementation of its centers of excellence, its
international operations, and the adoption of SOP 98-5. Adjusted EBITDA and
adjusted EBITDA as a percentage of net revenues for the nine months ended
September 30, 1999 were positively impacted by approximately $3 million as a
result of the change in the depreciable lives of subscriber devices previously
discussed.

                                       114
<PAGE>   125

     Interest expense, net of amounts capitalized, was relatively flat for the
nine months ended September 30, 1999, compared to the same period in 1998.
Interest expense, net of amounts capitalized, was $111 million for the nine
months ended September 30, 1999, compared to $109 million for the nine months
ended September 30, 1998. Interest expense is expected to increase in early 2000
because the amount of interest capitalized is anticipated to decrease after
PageNet's advanced wireless network is completed.

     PageNet adopted the provisions of SOP 98-5 effective January 1, 1999 and
recorded a charge of $37 million as the cumulative effect of a change in
accounting principle to write-off all remaining unamortized start-up costs as of
January 1, 1999. See note 4 to PageNet's consolidated financial statements for
the quarter ended September 30, 1999.

YEAR ENDED DECEMBER 31, 1998 COMPARED WITH THE YEAR ENDED DECEMBER 31, 1997

     Net revenues for the year ended December 31, 1998 were $968 million, an
increase of 15.4% over net revenues of $839 million for the year ended December
31, 1997. Revenues from services, rent and maintenance increased 15.5% to $946
million for the year ended December 31, 1998, compared to $818 million for the
year ended December 31, 1997. The increases in net revenues and revenues from
services, rent and maintenance were primarily due to an increase in average
revenue per unit resulting from the shift of PageNet's subscriber base toward
higher revenue products and services.

     The average revenue per unit for PageNet's core domestic operations
increased to $7.71 for the year ended December 31, 1998, compared to $7.20 for
the corresponding period of 1997. The number of units in service with
subscribers at December 31, 1998, was 10,110,000, compared to 10,344,000 units
in service with subscribers at December 31, 1997.

     Product sales decreased 29.5% to $101 million for the year ended December
31, 1998 compared to $143 million for the year ended December 31, 1997. The
decrease in product sales and corresponding decrease in cost of products sold
from 1997 to 1998 resulted primarily from PageNet's efforts to reduce the number
of customers using unprofitable services through certain pricing initiatives,
which resulted in a substantial decrease in sales through the reseller channel.

     Services, rent, and maintenance expenses increased 21.6% to $210 million
for the year ended December 31, 1998, compared to $173 million for the year
ended December 31, 1997. The increase in services, rent, and maintenance
expenses was partially a result of an increase in telephone expenses associated
with the enactment of regulations requiring that the providers of pay phones be
compensated for all calls placed from pay phones to toll-free numbers. This
requirement increased PageNet's cost of providing toll-free number service
commencing in the fourth quarter of 1997. The increases in services, rent, and
maintenance expenses from 1997 to 1998 were also attributable to the increased
contracted dispatch costs related to advanced messaging units placed in service
during 1998 and expenses associated with an increase in transmitter sites.

     Selling expenses were $104 million for the year ended December 31, 1998,
compared to $103 million for the year ended December 31, 1997. The decrease in
selling expenses as a percentage of net revenues from 1997 to 1998 resulted
primarily from a lower amount of sales commissions paid in conjunction with the
net decline in units in service with subscribers during 1998, and an overall
decrease in marketing research, development costs, and advertising expenses
associated with PageNet's VoiceNow service.

     General and administrative expenses increased 26.3% to $321 million for the
year ended December 31, 1998, compared to $254 million for the year ended
December 31, 1997. The increase in general and administrative expenses from 1997
to 1998 was caused by the same factors that caused increases in general and
administrative expenses from 1998 to 1999.

     Depreciation and amortization expense decreased 2.8% to $281 million for
the year ended December 31, 1998, compared to $289 million for the year ended
December 31, 1997. The decrease in depreciation and amortization expense from
1997 to 1998 resulted primarily from certain property and

                                       115
<PAGE>   126

equipment becoming fully depreciated, certain non-current assets becoming fully
amortized, and the decline in capital expenditures by PageNet.

     PageNet recorded a restructuring charge of $74 million during the quarter
ended March 31, 1998, as a result of a restructuring approved by PageNet's board
of directors in February 1998. See note 2 of PageNet's consolidated financial
statements for the year ended December 31, 1998.

     Adjusted EBITDA increased 7.6% to $333 million for the year ended December
31, 1998, compared to $310 million for the year ended December 31, 1997.
Adjusted EBITDA and adjusted EBITDA as a percentage of net revenues for 1998
were negatively impacted by PageNet's advanced messaging operations, the
formation of its centers of excellence, and its international operations.

     Interest expense, net of amounts capitalized, was $144 million for the year
ended December 31, 1998, compared to $151 million for the year ended December
31, 1997. The decrease in interest expense from 1997 to 1998 was primarily
attributable to an increase in interest capitalized, a decrease in interest
rates on outstanding borrowings under PageNet's credit agreement, and the
redemption of PageNet's 11.75% senior subordinated notes on May 14, 1997 with
lower interest rate funds borrowed under the credit agreement.

YEAR ENDED DECEMBER 31, 1997 COMPARED WITH THE YEAR ENDED DECEMBER 31, 1996

     Net revenues for the year ended December 31, 1997 were $839 million, an
increase of 18.9% over net revenues of $706 million for the year ended December
31, 1996. Revenues from services, rent and maintenance increased 19.3% to $818
million for the year ended December 31, 1997, compared to $686 million for the
year ended December 31, 1996. Product sales, less cost of products sold, were
$21 million for 1997 compared to $20 million for 1996. The increases in net
revenues and revenues from services, rent and maintenance were primarily due to
growth in the number of units in service with subscribers of PageNet.

     The number of units in service with subscribers at December 31, 1997, was
10,344,000, compared to 8,588,000 units in service with subscribers at December
31, 1996. The average revenue per unit for PageNet's core domestic operations
was $7.20 for the year ended December 31, 1997, compared to $7.46 for the year
ended December 31, 1996.

     Services, rent, and maintenance expenses increased 17.8% to $173 million
for the year ended December 31, 1997, compared to $147 million for the year
ended December 31, 1996. The increase in services, rent, and maintenance
expenses was the result of:

     - the growth in the number of units in service with subscribers;

     - expenses associated with an increase in transmitter sites;

     - expansion of nationwide transmission networks;

     - costs incurred by PageNet's Canadian operations; and

     - costs associated with the rollout of VoiceNow

     Selling expenses increased 24.4% to $103 million for the year ended
December 31, 1997, compared to $83 million for the year ended December 31, 1996.
The increase in selling expenses and the increase as a percentage of net
revenues from 1996 to 1997 resulted primarily from marketing research,
development costs, and advertising expenses associated with PageNet's VoiceNow
service, and from the addition of sales personnel to support the growth from
1996 to 1997 in both net revenues and the number of units in service with
subscribers.

     General and administrative expenses increased 15.8% to $254 million for the
year ended December 31, 1997, compared to $219 million for the year ended
December 31, 1996. The increase in general and administrative expenses from 1996
to 1997 occurred to support the growth in the number of units in service with
subscribers.

                                       116
<PAGE>   127

     Depreciation and amortization expense increased 35.6% to $289 million for
the year ended December 31, 1997, compared to $213 million for the year ended
December 31, 1996. The increase in depreciation and amortization expense from
1996 to 1997 resulted primarily from the increase in the number of subscriber
devices owned by PageNet and leased to subscribers, the increase in computer and
wireless messaging equipment used by PageNet in its operations, changes in
subscriber device depreciation, and the commencement of spectrum license
amortization. Effective January 1, 1997, PageNet shortened the depreciable life
of its subscriber devices from four to three years, and revised the related
residual values, in order to better reflect the estimated periods during which
the subscriber devices remain in service. The changes in depreciable lives and
residual values and the commencement of spectrum license amortization and other
costs associated with the introduction of PageNet's VoiceNow service increased
net loss by approximately $27 million for the year ended December 31, 1997.

     The non-recurring charge of $13 million in 1997 represents a write-down of
certain subscriber devices to their net realizable value. The non-recurring
charge of $23 million in 1996 represents a provision to write-off in excess of
400,000 subscriber devices leased by PageNet to customers under an agreement
with a national marketing affiliate. During 1996, PageNet experienced
significant cancellations by the customer base developed through this affiliate
and therefore did not expect to recover the subscriber devices from the former
customers of this marketing affiliate. Adjusted EBITDA increased 20.5% to $310
million for the year ended December 31, 1997, compared to $257 million for the
year ended December 31, 1996. Adjusted EBITDA and adjusted EBITDA as a
percentage of net revenues for 1997 were negatively impacted by the introduction
of PageNet's VoiceNow service and its international operations. Adjusted EBITDA
and adjusted EBITDA as a percentage of net revenues for 1996 were negatively
impacted by PageNet's international operations.

     Interest expense, net of amounts capitalized, was $151 million for the year
ended December 31, 1997, compared to $128 million for the year ended December
31, 1996. The increase in interest expense from 1996 to 1997 was primarily due
to the higher average level of indebtedness outstanding during 1997. The average
level of indebtedness outstanding during 1997 was $1.7 billion, compared to $1.2
billion outstanding during 1996. On May 14, 1997, PageNet redeemed its 11.75%
senior subordinated notes with lower interest rate funds borrowed under the
credit agreement. PageNet recorded an extraordinary loss of $16 million in the
second quarter of 1997 as a result of the early retirement of the 11.75% senior
subordinated notes. The extraordinary loss was comprised of the redemption
premium of $12 million and the write-off of unamortized issuance costs of $4
million.

LIQUIDITY AND CAPITAL RESOURCES

     For discussion of PageNet's anticipated non-compliance with certain debt
covenants and expected non-payment of interest due under certain of its senior
subordinated notes, see "Introduction" on page 111.

     Net cash provided by operating activities was $89 million for the nine
months ended September 30, 1999, compared to $191 million for the nine months
ended September 30, 1998. The decrease resulted primarily from an increase in
net loss before non-cash charges and a decrease in accrued liabilities due to
timing of payments. Net cash provided by operating activities was $277 million
for the year ended December 31, 1998, an increase of $126 million as compared to
the year ended December 31, 1997. The increase resulted primarily from a
decrease in net loss before restructuring charge of $69 million, an increase in
accounts payable of $54 million, and a decrease in inventories of $18 million.
The increase in accounts payable during 1998 resulted from the timing of
invoices at year-end 1998 related to additional capital expenditures incurred in
the fourth quarter of 1998 and additional expenses in the fourth quarter of 1998
related to the centers of excellence.

     PageNet's operations and expansion into new markets and product lines have
required substantial capital investment. Furthermore, PageNet has almost
completed building an advanced messaging network, which will enable it to offer
new enhanced messaging services and customized wireless information, and has
continued to convert certain back office functions from its decentralized field
offices into the centers of excellence. Capital expenditures, excluding payments
for spectrum licenses, were $437 million, $328

                                       117
<PAGE>   128

million, and $297 million, respectively, for the years ended December 31, 1996,
1997, and 1998, and $171 million and $163 million, respectively, for the nine
months ended September 30, 1998 and 1999, and consisted primarily of
expenditures on PageNet's core operations, PageNet's advanced messaging
operations, and the centers of excellence.

     Capital expenditures related to PageNet's core operations, excluding
capital expenditures related to the centers of excellence, were $390 million,
$224 million, and $143 million, respectively, for the years ended December 31,
1996, 1997, and 1998, and $83 million and $66 million, respectively, for the
nine months ended September 30, 1998 and 1999. The decreases in core capital
expenditures have been primarily due to a reduction in PageNet's network-related
expenditures pertaining to geographic coverage and capacity expansion. Also,
during 1997, PageNet began instituting programs to utilize subscriber devices
more effectively and to more closely control subscriber device capital
expenditures. In addition to the programs to utilize subscriber devices more
effectively, the decrease in core capital expenditures in 1997 was also due to
increased efficiencies in infrastructure deployment.

     Capital expenditures related to PageNet's VoiceNow product were $47
million, $104 million, and $97 million, respectively, for the years ended
December 31, 1996, 1997, and 1998, and capital expenditures related to advanced
messaging operations were $58 million and $72 million, respectively, for the
nine months ended September 30, 1998 and 1999. PageNet expects to substantially
complete capital expenditures related to its advanced messaging network during
the first quarter of 2000.

     Capital expenditures related to establishing PageNet's centers of
excellence, including new system implementations, were $57 million for the year
ended December 31, 1998, and $30 million and $25 million, respectively, for the
nine months ended September 30, 1998 and 1999. PageNet plans to spend additional
capital related to the establishment of its centers of excellence in the fourth
quarter of 1999 and the first quarter of 2000, and to suspend expenditure of
additional related capital after that time, pending the development of detailed
integration plans with Arch following the merger.

     The amount of capital expenditures may fluctuate from quarter to quarter
and on an annual basis due to several factors, including the variability of
units in service with subscribers. Based on current expectations, PageNet
expects the total amount of capital expenditures to be approximately $50 million
in the fourth quarter of 1999. With the substantial completion of the expansion
of the advanced messaging network and the suspension of future conversions to
the centers of excellence beyond January 2000, PageNet expects its capital
expenditures in 2000 to decrease as compared to 1999. However, PageNet is
currently unable to estimate its capital expenditures for 2000 due to
uncertainty about the merger and the liquidity matters discussed in note 1 to
PageNet's consolidated financial statements for the quarter ended September 30,
1999.

     The deficiency in free cash flow for PageNet's consolidated operations for
the nine months ended September 30, 1999 was $74 million. The deficiency in free
cash flow for PageNet's consolidated operations for the nine months ended
September 30, 1998 was $11 million. The deficiency in free cash flow for
PageNet's consolidated operations for the years ended December 31, 1996, 1997,
and 1998 was $305 million, $167 million, and $106 million, respectively. The
decline in free cash flow for the nine months ended September 30, 1999 was
primarily the result of a decrease in adjusted EBITDA. The improvements in free
cash flow in 1997 and 1998 were primarily the result of decreases in capital
expenditures and increases in adjusted EBITDA in PageNet's core domestic
operations.

     The two credit agreements of PageNet's Canadian subsidiaries provide for
total borrowings of approximately $75 million. As of September 30, 1999,
approximately $52 million of borrowings were outstanding under the Canadian
credit facilities. Additional borrowings are available to PageNet's Canadian
subsidiaries under these facilities, so long as the borrowings are either
collateralized or certain financial covenants are met.

MARKET RISK

     The risk inherent in PageNet's market risk sensitive instruments is the
potential loss arising from adverse changes in interest rates and foreign
currency exchange rates. PageNet's earnings are affected by changes in interest
rates due to the impact those changes have on the Company's variable-rate debt

                                       118
<PAGE>   129

obligations, which represented approximately 34% and 40% of its total long-term
obligations as of December 31, 1998, and September 30, 1999, respectively. If
interest rates average one percent more in 1999 than they did during 1998,
PageNet's interest expense would increase by approximately $6 million. The
impact of an increase in interest rates was determined based on the impact of
the hypothetical change in interest rates on PageNet's variable-rate long-term
obligations as of December 31, 1998. Market risk for fixed-rate long-term
obligations is estimated as the potential increase in fair value resulting from
a hypothetical one percent decrease in interest rates and amounted to
approximately $68 million as of December 31, 1998, based on discounted cash flow
analyses. The preceding sensitivity analyses do not, however, consider the
effects that such changes in interest rates may have on overall economic
activity, nor does it consider additional actions PageNet may take to mitigate
its exposure to such changes. Actual results may differ from the above analyses.

     PageNet's earnings are also affected by foreign exchange rate fluctuations
between the U.S. dollar and the Canadian dollar. In addition, PageNet is subject
to market risk related to its net investments in its Canadian subsidiaries.
However, the impact of such market risk exposures as a result of foreign
exchange rate fluctuations has not been, and is not expected to be, material
based on the relative insignificance of PageNet's Canadian subsidiaries to
PageNet's financial position or results of operations. As of September 30, 1999,
PageNet was not engaged in other activities that would cause exposure to the
risk of material earnings or cash flow loss due to changes in interest rates,
foreign currency exchange rates, or market commodity prices.

INFLATION

     Inflation has not had a material effect on PageNet's operations to date.
Paging systems equipment and operating costs have not increased in price and
PageNet's pager costs have declined substantially in recent years. This
reduction in costs has generally been reflected in lower pager prices charged to
subscribers who purchase their units. PageNet's general and administrative
operating expenses, such as salaries, employee benefits and occupancy costs, are
subject to normal inflationary pressures.

YEAR 2000 COMPLIANCE

     PageNet implemented a task force and developed a comprehensive plan to
address Year 2000 issues.

     PageNet completed all of the phases for its critical business processes
and, to date, has not experienced any Year 2000-related errors. PageNet
continues to utilize both internal and external resources to evaluate and test
its systems. PageNet expended approximately $4 million correcting Year 2000
problems.

     PageNet believes that all mission critical vendors have successfully
readied their systems for the Year 2000 and, to date, we have not experienced
any Year 2000-related errors in their systems.

     PageNet believes it has met all project deliverables according to schedule
based on management's review and verification of the project documentation.
However, actual results could differ materially from those anticipated,
particularly due to the potential impact of third-party modification plans.
PageNet's business, financial position, or results of operations could be
materially adversely affected by the failure of its computer systems and
applications, or those operated by third parties, to properly operate or manage
dates beyond 1999. In addition, disruptions in the economy generally resulting
from Year 2000 issues could materially adversely affect PageNet. PageNet cannot
estimate the amount of any potential liability or lost revenue.

                                       119
<PAGE>   130

                  MARKET PRICE INFORMATION AND DIVIDEND POLICY

COMPARATIVE PRICE INFORMATION

     Arch common stock is traded on the Nasdaq National Market System under the
symbol "APGR". PageNet common stock is traded on the Nasdaq National Market and
the Chicago Stock Exchange under the symbol "PAGE". The following table sets
forth the high and low trading prices per share of Arch common stock, and the
high and low trading prices per share of PageNet common stock, for the quarterly
periods indicated, which correspond to the companies' respective quarterly
fiscal periods for financial reporting purposes.

<TABLE>
<CAPTION>
                                                          ARCH                  PAGENET
                                                      COMMON STOCK            COMMON STOCK
                                                  --------------------    --------------------
                                                    HIGH        LOW         HIGH        LOW
                                                  --------    --------    --------    --------
<S>                                               <C>         <C>         <C>         <C>
Fiscal Year Ended December 31, 1998:
First Quarter...................................  $18.375     $ 9.00      $16.3750    $      9.5000
  Second Quarter................................  $20.8125    $10.50      $16.6250    $     12.5000
  Third Quarter.................................  $15.00      $ 5.0625    $14.6250    $      4.8125
  Fourth Quarter................................  $ 5.4375    $ 2.0625    $ 7.3750    $      3.5625
Fiscal Year Ended December 31, 1999:
  First Quarter.................................  $ 7.5       $ 3.1875    $ 7.0000    $      3.8750
  Second Quarter................................  $11.625     $ 3.375     $ 4.9375    $      3.0000
  Third Quarter.................................  $ 8.875     $ 4.00      $ 6.8750    $      0.7188
  Fourth Quarter................................  $ 7.75      $ 3.50      $ 1.7188    $      0.5938
Fiscal year ended December 31, 2000:
  First Quarter (through January 27, 2000)......  $ 7.25      $ 5.5625    $ 2.7500    $      0.7500
</TABLE>

     The following table presents trading information for Arch common stock and
PageNet common stock for November 5, 1999 and           , 2000. November 5, 1999
was the last full trading day prior to the public announcement of the proposed
merger.           , 2000 was the last practicable trading day for which
information was available prior to the date of the first mailing of this joint
proxy statement/prospectus. The table provides trading information for (1) one
share of Arch common stock, (2) one share of PageNet common stock and (3) 0.1247
shares of Arch common stock, which is the equivalent of one share of PageNet
common stock based on the exchange ratio to be used in the merger, exclusive of
the value of shares of Vast to be received by PageNet stockholders.

<TABLE>
<CAPTION>
                                  ARCH                          PAGENET                            ARCH
                              COMMON STOCK                    COMMON STOCK                 PRO FORMA EQUIVALENT
                       ---------------------------   ------------------------------   ------------------------------
                        HIGH       LOW      CLOSE      HIGH       LOW       CLOSE       HIGH       LOW       CLOSE
                       -------   -------   -------   --------   --------   --------   --------   --------   --------
<S>                    <C>       <C>       <C>       <C>        <C>        <C>        <C>        <C>        <C>
November 5, 1999.....  $ 7.125   $ 6.375   $6.8125   $1.03125   $0.90625   $0.96875   $0.88849   $0.79496   $0.84952
         , 2000......
</TABLE>

DIVIDEND POLICY

     Arch has never declared or paid any cash dividends on its common stock.
Arch anticipates that substantially all of its earnings in the foreseeable
future will be used to finance the continued growth and development of its
business and has no current intention to pay cash dividends. Arch's future
dividend policy will depend on its earnings, capital requirements and financial
condition, as well as requirements of its financing agreements and other factors
that Arch's board of directors considers relevant. Arch's secured credit
facility prohibits declaration or payment of cash dividends to Arch stockholders
without the written consent of a majority of the lenders. The terms of other
outstanding indebtedness only permit the declaration or payment of cash
dividends if specified leverage and cash flow requirements are met. Arch does
not currently meet these requirements. In addition, the terms of Arch's
outstanding Series C preferred stock generally prohibit the payment of cash
dividends on common stock unless all accrued dividends due on to the Series C
preferred stock have been paid in full. See "Description of Arch's Equity
Securities" and "Description of Indebtedness".

                                       120
<PAGE>   131

         COMPARATIVE HISTORICAL AND UNAUDITED PRO FORMA PER SHARE DATA

     The following table sets forth certain historical per share data of Arch
and PageNet and combined per share data on an unaudited pro forma basis after
giving effect to the merger based on the purchase method of accounting. This
data should be read in conjunction with the selected financial data and the
historical financial statements of Arch and PageNet and notes. The pro forma
information is presented for informational purposes only and is not necessarily
indicative of the financial position or results of operations that would have
occurred if Arch and PageNet had been a single entity during the period
presented nor is it necessarily indicative of the results of operations which
may occur in the future.

<TABLE>
<CAPTION>
                                                                 HISTORICAL       PRO FORMA
                                                              -----------------   ---------
                                                              PAGENET    ARCH     COMBINED
                                                              -------   -------   ---------
<S>                                                           <C>       <C>       <C>
As of and for the nine month period ended September 30,
1999:
  Earnings per common share -- basic and diluted............  $(1.89)   $ (9.00)   $(1.69)
  Book value per common share...............................   (6.97)     (7.21)     4.39
For the twelve month period ended December 31, 1998:
  Earning per common share -- basic and diluted.............   (1.57)    (29.34)    (1.50)
</TABLE>

                                       121
<PAGE>   132

                               INDUSTRY OVERVIEW

     The mobile wireless communications industry has been in existence since
1949 when the FCC allocated a group of radio frequencies for use in providing
one-way and two-way types of mobile communications services. Throughout its
history, the industry has been characterized by rapid changes in technology and
growing consumer demand for mobile wireless communications products with
increased capabilities. Particularly since the 1980s, the number of firms
competing in this business has increased and now includes major
telecommunications companies such as AT&T, SBC Communications, and MCI/
Worldcom.

     The mobile wireless industry now consists of multiple voice and data
providers which compete among one another, both directly and indirectly, for
subscribers. Providers in the mobile wireless industry may offer both two-way
interactive voice services, referred to as voice communications, and traditional
paging services, either separately or through a device which offers the
capability to have both voice communications and traditional paging services,
referred to as short messaging services, or may focus on providing a more narrow
range of services, such as data only. Arch and PageNet presently offer both
numeric and alphanumeric messaging services, as well as 1 1/2 way and two-way
messaging services which have in part been offered initially over facilities of
other carriers. PageNet also offers certain information and content based
services for both mass market and customized application. PageNet provides voice
communications through its VoiceNow product, and Arch provides voice
communications as a distributor for other carriers.

     Technological improvements have generally contributed to strong growth in
the market for mobile wireless communications services and the provision of
better quality services at lower prices to subscribers. Companies providing
traditional one-way paging have benefited from technological advances resulting
from research and development conducted by vendors of paging units and
transmission equipment. These advances include microcircuitry, liquid crystal
display technology and standard digital encoding formats. These advances have
enhanced the capability and capacity of mobile wireless messaging services while
lowering equipment and air time costs.

     Other mobile wireless communications alternatives have similarly
experienced rapid changes through technological improvement which has resulted
in more consumer interest and demand. Much of this development has occurred in
various broadband products and services, such as digital cellular phones and
services, broadband personal communication services, or PCS, and digital SMR,
dedicated data networks and other mobile wireless information services and
equipment. As quality, convenience and availability of broadband offerings has
expanded, prices have decreased and consumer interest has increased.

     Arch and PageNet believe that paging has historically been a cost-effective
form of mobile wireless communications. Paging has traditionally had somewhat of
an advantage over a cellular telephone or broadband PCS or SMR handset because
the handset is smaller and has a longer battery life, and the service has
broader coverage and better building penetration. Moreover, paging units and air
time required to transmit an average message generally have cost less than
equipment and airtime for cellular telephones or broadband PCS or SMR handsets.
However, because a significant percentage of two-way voice services are
combining short messaging services with two-way voice capability in a single
unit, it may be economical and convenient for customers who have traditionally
used both services to discontinue their traditional paging services in favor of
the combined unit and services. Furthermore, as technology continues to develop,
these other communications alternatives are becoming smaller, more durable and
cheaper, and have better transmission quality. Arch and PageNet are committed to
expanding their service offerings, such as 1 1/2 and two-way messaging, to
ensure that their services remain competitive under rapidly changing market
conditions.

     Messaging subscribers such as those served by Arch and PageNet pay a flat
monthly service fee for paging services, unlike cellular telephone or broadband
PCS subscribers, whose bills typically have a significant variable usage
component. However, cellular and PCS firms are beginning to offer one rate, and

                                       122
<PAGE>   133

other plans which lower the price point so that these services compete directly
with the paging services Arch and PageNet offer. Arch and PageNet are sensitive
to these technological and availability changes and are working to design
competitively attractive values for the consumer even in the midst of these
changes by cellular, broadband PCS and digital SMR providers.

     The mobile wireless communications industry originally distributed its
services through direct marketing and sales activities. Later, additional
channels of distribution evolved. These channels include: (1) carrier-operated
stores, (2) resellers, who purchase services on a wholesale basis from carriers
and resell those services on a retail basis to their own customers; (3) agents
who solicit customers for carriers and are compensated on a commission basis;
(4) retail outlets that often sell a variety of merchandise, including pagers
and other telecommunications equipment; and (5) most recently, the Internet.

REGULATION

     Federal Regulation

     Arch's and PageNet's mobile wireless messaging operations are subject to
regulation by the Federal Communications Commission (FCC) under the
Communications Act of 1934, as amended (the Communications Act). The Company's
operations are all classified as Commercial Mobile Radio Services (CMRS) and are
subject to common carrier regulation by the FCC. The FCC has granted Arch and
PageNet licenses to use the radio frequencies necessary to conduct their CMRS
operations. Licenses issued by the FCC to Arch and PageNet set forth the
technical parameters, such as power strength and tower height, under which Arch
and PageNet are authorized to use those frequencies. Each FCC license held by
Arch or PageNet has construction and operational requirements within set time
frames. The Communications Act was amended in August 1993 to permit the FCC to
grant certain applications for licenses which are mutually exclusive by
competitive bidding. The August 1993 amendments do not permit auctions to be
used for license renewals or license modifications. The FCC is currently using
auctions to assign all new licenses over which CMRS can be offered.

     The FCC licenses granted to Arch and PageNet have varying terms of up to 10
years, at the end of which time renewal applications must be approved by the
FCC. In the past, FCC renewal applications have been routinely granted, in most
cases upon a demonstration of compliance with FCC regulations and adequate
service to the public. The FCC has granted each renewal license Arch and PageNet
have filed, other than those which are pending. Although Arch and PageNet are
unaware of any circumstances which would prevent the grant of any pending or
future renewal applications, no assurance can be given that any of Arch's or
PageNet's licenses will be renewed by the FCC. Furthermore, although revocation
and involuntary modification of licenses are extraordinary regulatory measures,
the FCC has the authority to restrict the operation of licensed facilities or
revoke or modify licenses. PageNet is seeking an extension of time in which to
meet construction benchmarks for certain licenses acquired at auction. Failure
to obtain such extensions could result in PageNet or Arch having to make capital
expenditures it would prefer to delay. No license of PageNet or Arch has ever
been revoked or modified involuntarily.

     The FCC's review and revision of rules affecting companies such as Arch and
PageNet, is ongoing. The regulatory requirements to which Arch and PageNet are
subject may change significantly over time. For example, the FCC has decided to
adopt a market area licensing scheme for non-nationwide paging channels under
which carriers would be licensed to operate on a particular channel throughout a
broad geographic area (such as a major economic area as defined by The Bureau of
Economic Affairs of the U.S. Department of Commerce) rather than being licensed
on a transmitter site-by-transmitter site basis. These geographic area licenses
will initially be awarded through an auction. Incumbent paging licensees that do
not acquire licenses at auction will be entitled to interference protection from
the market area licensee.

                                       123
<PAGE>   134

     In many instances Arch and PageNet still require the prior approval of the
FCC before they can implement any significant changes to their radio systems.
Once the FCC's market area licensing rules are implemented, however, these
site-specific licensing obligations will be eliminated, with specific
exceptions.

     The FCC has issued a Further Notice of Proposed Rulemaking in which the FCC
seeks comments on, among other matters, (1) whether it should impose coverage
requirements on licensees with nationwide exclusivity, such as the combined
company, (2) whether these coverage requirements should be imposed on a
nationwide or regional basis, and (3) whether - if such requirements are imposed
- - failure to meet the requirements should result in a revocation of the entire
nationwide license or merely a portion of the license. If the FCC were to impose
additional, stringent coverage requirements on licensees with nationwide
exclusivity, Arch and PageNet might have to accelerate the build out of their
systems in certain areas.

     The Communications Act requires licensees such as Arch and PageNet to
obtain prior approval from the FCC for the transfer of control of any
construction permit or station license. The Communications Act also requires
prior approval by the FCC of acquisitions of other CMRS companies by Arch and
PageNet and transfers by Arch and PageNet of a controlling interest in any of
their licenses or construction permits. The FCC has approved each acquisition
and transfer of control for which Arch or PageNet have sought approval. Arch and
PageNet also regularly apply for FCC authority to use additional frequencies,
modify the technical parameters of existing licenses, expand their service
territory, provide new services, and modify the conditions under which they
provide service. Although there can be no assurance that any requests for
approval of applications filed by Arch and PageNet will be approved or acted
upon in a timely manner by the FCC, or that the FCC will grant the relief
requested, Arch and PageNet know of no reason to believe any such requests,
applications, or relief will not be approved or granted. Neither Arch nor
PageNet make any representations, however, about the continued availability of
additional frequencies used to provide their services.

     The Communications Act also limits foreign ownership of entities that
directly or indirectly hold certain licenses from the FCC, including certain of
those held by Arch or PageNet. Because Arch and PageNet hold licenses from the
FCC only through subsidiaries, up to 25% of either company's common stock can be
owned or voted by aliens or their representatives, a foreign government or its
representatives, or a foreign corporation, without restriction. However, if more
than 25% of either company's common stock is owned or voted by aliens or their
representatives, a foreign corporation, or a foreign government or its
representatives, the Telecommunications Act of 1996 (the 1996 Act) gives the FCC
the right to revoke or refuse to grant licenses if the FCC finds that such
revocation or refusal serves the public interest. The FCC has indicated that,
pursuant to the World Trade Organization Telecommunications Agreement, it would
waive the 25% limitation in appropriate circumstances. Based upon information
obtained by Arch and PageNet, each of Arch and PageNet believe that
substantially less than 25% of their issued and outstanding common stock is
owned by aliens or their representatives, foreign governments or their
representatives, or foreign corporations. Arch and PageNet subsidiaries that are
radio common carrier licensees are subject to more stringent requirements and
may have only up to 20% of their stock owned or voted by aliens or their
representatives, a foreign government or their representatives or a foreign
corporation. This ownership restriction is not subject to waiver.

     Increased demand for telephone numbers, particularly in metropolitan areas,
is causing depletion of numbers in certain area codes. Recent plans to address
this increased demand have included certain elements that could impact Arch's
and PageNet's operations, including the take-back of numbers already assigned
for use and service-specific plans whereby only certain services, such as paging
and cellular, would be assigned numbers using a new area code, or plans which
require the pooling of blocks of numbers for use by multiple carriers. Neither
Arch nor PageNet can provide any assurance that such plans will not be adopted
by a federal or state commission, or that such plans will not require Arch or
PageNet to incur further, substantial expenses in order to continue to obtain
telephone numbers for its subscribers.

                                       124
<PAGE>   135

     The 1996 Act is intended to promote competition in local exchange services
through the removal of legal or other barriers to entry. Under the 1996 Act, the
Regional Bell Operating Companies and other local exchange carriers, or LECs,
may be permitted to jointly market commercial mobile service in conjunction with
their traditional local exchange services. It imposes upon all
telecommunications carriers the duty to interconnect with the facilities and
equipment of other telecommunications carriers. The FCC, and the 9th Circuit
Court of Appeals, among others, have interpreted the 1996 Act to require LECs to
compensate mobile wireless carriers for calls originated by customers of the
LECs which terminate on a mobile wireless carrier's network. The FCC has also
found unlawful certain charges levied against messaging carriers in the past
that have been assessed on a monthly basis by the LECs for the use of
interconnection facilities, including telephone numbers. These findings by the
FCC have been challenged at the FCC and in the courts. Neither Arch nor PageNet
can predict with certainty the ultimate outcome of these proceedings.
Compensation amounts may be determined in subsequent proceedings either at the
federal or state level, or may be determined based on negotiations between the
LECs and the paging companies. Any agreements reached between the LECs and the
paging companies may be required to be submitted to state regulatory commission
for approval. PageNet has negotiated interconnection agreements with certain
major LECs and is in negotiations with other LECs but can provide no assurances
that they will obtain interconnection agreements with all LECs. Arch is also in
negotiations with LECs, but as with PageNet in markets where PageNet has not
reached agreements, it may or may not be successful in securing refunds, future
relief, or both, with respect to charges for termination of LECs originated
local traffic. If these issues are ultimately decided in favor of the LECs,
Arch, and to a lesser extent PageNet because of the agreements it has reached,
may be required to pay past due contested charges and may also be assessed
interest and late charges for amounts withheld.

     While the 1996 Act has had a beneficial effect for mobile wireless
providers, some provisions place or may place additional financial obligations
on Arch, PageNet, and other carriers. As an example, the 1996 Act, as
interpreted by some regulatory and judicial bodies, requires CMRS such as Arch
and PageNet to contribute to "universal service" or other funds to assure the
continued availability of local exchange service to high cost areas, as well as
to contribute funds to cover other designated costs or societal goals. Further,
the 1996 Act requires that providers of payphones be compensated for all calls
placed from pay telephones to toll-free numbers. This latter requirement
increases Arch's and PageNet's costs of providing toll-free number service, and
there are no assurances that either Arch or PageNet will be able to continue to
pass on their costs to their subscribers. Beneficially, the 1996 Act also limits
the circumstances under which states and local governments may deny a request by
a commercial mobile service provider to place transmission facilities, and gives
the FCC the authority to preempt the states in some circumstances.

     The Communications Assistance for Law Enforcement Act, or CALEA, requires
certain telecommunications companies, including the Company, to modify the
design of their equipment or services to ensure that electronic surveillance or
interceptions can be performed. Technical parameters applicable to the messaging
industry have been established but not acknowledged by all governmental bodies
to date. Therefore, neither Arch nor PageNet can determine at this time what
compliance measures will be required or the costs thereof. As part of, and in
addition to, implementation of the 1996 Act, the FCC has instituted proceedings
addressing the manner in which telecommunications carriers are permitted to
jointly market certain types of services, and the manner in which
telecommunications carriers render bills for these services. Depending on the
outcome of these proceedings, PageNet, Arch, and other telecommunications
carriers could incur higher administration and other costs in order to comply.

     State Regulation

     In addition to potential regulation by the FCC, certain states have the
authority to regulate messaging services, except where such regulation
constitutes rate or entry, both of which have been preempted by the August 1993
Amendments, as interpreted by the FCC. States may also petition the FCC for
authority to continue to regulate CMRS rates if certain conditions are met.
State filings seeking rate authority have all been denied by the FCC, although
new petitions seeking such authority may be filed in the future.

                                       125
<PAGE>   136

Furthermore, some states and localities continue to exert jurisdiction over (1)
approval of acquisitions of assets and transfers of licenses of mobile wireless
systems and (2) resolution of consumer complaints. Arch and PageNet believe that
to date all required filings for their respective paging operations have been
made. All state approvals of acquisitions or transfers made by Arch and PageNet
have been approved, and neither Arch nor PageNet knows of any reason to believe
such approvals will not continue to be granted in connection with any future
requests, even if states exercise that review. The August 1993 Amendments do not
preempt state regulatory authority over other aspects of the Company's
operations, and some state may choose to exercise such authority. Some state and
local governments have imposed additional taxes or fees upon certain activities
in which the Company is engaged. In addition, in certain instances, the
construction and operation of radio transmitters also will be subject to zoning,
land use, public health and safety, consumer protection and other state and
local taxes, levies and ordinances. As noted above, states also have authority
over telephone number allocation and assignment that may be delegated them by
the FCC.

                                       126
<PAGE>   137

                                ARCH'S BUSINESS

     Arch is a leading provider of wireless communications services in the
United States, and believes that it is well positioned to compete effectively in
the highly competitive wireless communications industry for the following
reasons. The combination of Arch's recently acquired market presence in major
metropolitan markets with its historical emphasis on middle and small markets
has significantly broadened the geographic scope of Arch's marketing presence
and has positioned Arch to compete more effectively for large corporate
customers with diverse geographic operations. Arch's enlarged subscriber base
enables it to obtain better strategic distribution arrangements, as well as
amortize marketing investments over a larger revenue base. In addition, Arch's
third-party retail distribution agreements complement the more than 175
Arch-operated retail outlets. Similarly, Arch's two nationwide paging networks
and the associated potential for higher-revenue nationwide services enhance
Arch's local coverage and provide an opportunity to take advantage of Arch's
distribution networks. Arch recognizes that changes in competition and the newly
offered products and services that incorporate paging as one of their features
demand that Arch aggressively develop new products with enhanced features and
that Arch do so at a competitive cost for customers.

     Arch's plan to deploy its nationwide N-PCS spectrum using its existing
network infrastructure, together with its recent agreement with Weblink
Wireless, formerly known as PageMart Wireless, described below, should permit
Arch to market N-PCS services, such as multi-market alphanumeric and other
advanced messaging services, sooner than it would otherwise be able to, and
these services are expected to offer higher revenue and more growth potential
than basic paging services. Finally, Arch's investments to date in two national
call centers and additional regional call centers should supplement its
previously developed call center and complement its strategy of evolving to
regional customer service centers. Achieving these intended benefits, however,
will depend on a number of factors and no assurance can be given that the
benefits will be realized, in whole or in part. See "Arch Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
"-- Networks and Licenses".

     The expected effects of the PageNet merger on Arch's business are described
under "The Combined Company -- Business".

BUSINESS STRATEGY

     Arch's strategic objective is to strengthen its position as one of the
leading providers of wireless communications services in the United States and
at the same time begin to position itself to remain competitive in the rapidly
expanding wireless communications market which now includes major
telecommunications companies such as MCI/Worldcom and AT&T.

     Arch is committed to continuing to provide high-quality service to its
current customers while at the same time working to expand the wireless
communications choices it provides them. Arch has already begun to offer
guaranteed or 1.5-way messaging and 2-way messaging and seeks to continue that
development. Arch has recognized that in order to fully serve its current
customers it will need to have a strong presence in the N-PCS market which will
allow it to expand its present offerings even further. The wireless
communications industry is going to continue to change and Arch seeks to
position itself to offer wireless communication options that are broad enough to
meet the needs of most potential customers. At the same time, Arch recognizes
the need to offer a good value to consumers, letting them utilize the services
they need at economical prices. This means providing local, regional and
national services that allow consumers to choose the type of coverage that they
require. Arch is aggressively seeking cost savings and working to continue to
operate more efficiently.

     Operating Strategy.  Arch's operating objectives are to increase its
adjusted EBITDA, deploy its capital efficiently, reduce its financial leverage
and expand its customer relationships. Arch will pursue the following strategies
to achieve its operating objectives:

          - Low-Cost Operating Structure.  Arch has selected a low-cost
     operating strategy as its principal competitive tactic. Management believes
     that a low-cost operating structure, compared to differenti-

                                       127
<PAGE>   138

     ated premium pricing and niche positioning, the other two fundamental
     competitive tactics in the wireless communications industry, will maximize
     its flexibility to offer competitive prices while still achieving target
     margins and adjusted EBITDA. Arch will continue to improve its low-cost
     operating structure by consolidating some operating functions, including
     centralized purchases from key vendors, to achieve economies of scale, and
     installing technologically advanced and reliable transmission systems.

          - Efficient Capital Deployment.  Arch's principal financial objective
     is to reduce financial leverage by reducing capital requirements and
     increasing adjusted EBITDA. To reduce capital expenditures, Arch has
     already implemented a company-wide focus on the sale, rather than lease, of
     pagers. This is because subscriber-owned units require a lower level of
     capital investment than company-owned units.

          - Balanced Distribution.  Arch's combination of direct sales,
     company-owned stores and third party resellers are supplemented by its
     local market direct sales force and its distribution agreements with
     third-party regional and national retailers. In addition, Arch's national
     accounts sales force is enabling Arch to improve distribution to nationwide
     customers.

          - Capitalize on Revenue Enhancement Opportunities.  Arch has one of
     the broadest product offerings in the industry, including traditional
     paging services as well as new services such as guaranteed or 1.5-way
     messaging and 2-way messaging services, wireless e-mail and content
     delivery services. Arch has entered into a strategic alliance with Weblink
     Wireless, formerly known as PageMart Wireless, to accelerate delivery of
     these new services, utilizing portions of Weblink Wireless' N-PCS network
     in conjunction with Arch's own network while sharing specified costs with
     Weblink Wireless. This will provide Arch with more economical and broader
     access to higher ARPU nationwide, regional or text messaging services. To
     date, Arch has marketed these services only on a limited basis through the
     resale of other carriers' services on less attractive terms. Arch believes
     there will be a number of new revenue opportunities associated with its
     approximately 7.0 million units in service, including selling enhanced
     services which add value such as voice mail, resale of long-distance
     service and fax storage and retrieval. See "-- Wireless Communications
     Services, Products and Operations" and "-- Networks and Licenses".

     Arch's strategic plans following the PageNet merger are described under
"The Combined Company -- Strategy".

WIRELESS COMMUNICATIONS SERVICES, PRODUCTS AND OPERATIONS

     Arch is a leading provider of wireless communications services, primarily
wireless messaging services, including digital display, alphanumeric display,
guaranteed messaging and 2-way messaging. Arch operates in all 50 states and the
District of Columbia and in each of the 100 largest markets in the United
States. Arch offers these services on a local, regional and nationwide basis
employing digital networks covering more than 90% of the United States
population.

     The following table sets forth information about the approximate number of
units in service with Arch subscribers and net increases in number of units
through internal growth and acquisitions since 1995:

<TABLE>
<CAPTION>
                                 UNITS IN SERVICE     NET INCREASE IN      INCREASE IN UNITS    UNITS IN SERVICE
                                 AT BEGINNING OF       UNITS THROUGH            THROUGH            AT END OF
YEAR ENDED DECEMBER 31,               PERIOD         INTERNAL GROWTH(1)     ACQUISITIONS(2)          PERIOD
- -----------------------          ----------------    ------------------    -----------------    ----------------
<S>                              <C>                 <C>                   <C>                  <C>
1995...........................       538,000             366,000              1,102,000           2,006,000
  1996.........................     2,006,000             815,000                474,000           3,295,000
  1997.........................     3,295,000             595,000                     --           3,890,000
  1998.........................     3,890,000             386,000                     --           4,276,000
<CAPTION>
NINE MONTHS ENDED
SEPTEMBER 30,
- -----------------
<S>                              <C>                 <C>                   <C>                  <C>
1999...........................     4,276,000             (14,000)             2,762,000           7,024,000
</TABLE>

                                       128
<PAGE>   139

     Net increase in units through internal growth includes internal growth in
acquired paging businesses after their acquisition by Arch and is net of
subscriber cancellations during each applicable period. Increase in units
through acquisitions is based on units in service of acquired paging businesses
at the time of their acquisition by Arch.

     A digital display pager permits a caller to transmit to the subscriber a
numeric message that may consist of a telephone number, an account number or
coded information, and has the capability to store several such numeric messages
in memory for later recall by the subscriber. An alphanumeric display pager
allows subscribers to receive and store messages consisting of both numbers and
letters.

     Digital display paging service, which was introduced by the paging industry
nearly 20 years ago, currently represents a majority of all units in service.
The growth of alphanumeric display service, which was introduced in the
mid-1980s, has been constrained by its difficulties, such as inputting data, its
requirements of specialized equipment and its relatively high use of system
capacity during transmission, which has, to some extent, been relieved by
deploying alternate communications pathways, such as the Internet.

     The following table summarizes the types of Arch's units in service at
specified dates:

<TABLE>
<CAPTION>
                                                          DECEMBER 31,
                                               ----------------------------------     SEPTEMBER 30,
                                                    1997               1998               1999
                                               ---------------    ---------------    ---------------
                                                 UNITS      %       UNITS      %       UNITS      %
                                               ---------   ---    ---------   ---    ---------   ---
<S>                                            <C>         <C>    <C>         <C>    <C>         <C>
Digital display............................    3,284,000    85%   3,586,000    84%   5,391,000    77%
Alphanumeric display.......................      524,000    13      621,000    14    1,195,000    17
Other......................................       82,000     2       69,000     2       62,000    --
Customers with Nationwide Services.........           --    --           --    --      386,000     6
                                               ---------   ---    ---------   ---    ---------   ---
         Total.............................    3,890,000   100%   4,276,000   100%   7,024,000   100%
                                               =========   ===    =========   ===    =========   ===
</TABLE>

     Units reflected in chart include guaranteed and 2-way messaging units.

     Arch provides messaging service to subscribers for a monthly fee.
Subscribers either lease the unit from Arch for an additional fixed monthly fee
or they own the unit, having purchased it either from Arch or from another
vendor. Arch owned units leased to subscribers require capital investment by
Arch while customer-owned and maintained units, commonly referred to as COAM
units, and those owned by resellers do not. The monthly service fee is generally
based upon the type of service provided, the geographic area covered, the number
of units provided to the customer and the period of the subscriber's commitment.
Subscriber-owned units provide a more rapid recovery of Arch's capital
investment than units owned and maintained by Arch, but may generate less
recurring revenue. Arch also sells units to third-party resellers who lease or
resell units to their own subscribers and resell Arch's wireless messaging
services under marketing agreements. Resellers are responsible for sales,
billing, collection and equipment maintenance costs. Arch sells other products
and services, including units and accessories and unit replacement and
maintenance contracts. The following table summarizes the number of Arch-owned
and leased, subscriber-owned and reseller-owned units in service at specified
dates:

<TABLE>
<CAPTION>
                                                 DECEMBER 31        DECEMBER 31       SEPTEMBER 30
                                                    1997               1998               1999
                                               ---------------    ---------------    ---------------
                                                 UNITS      %       UNITS      %       UNITS      %
<S>                                            <C>         <C>    <C>         <C>    <C>         <C>
Arch-owned and leased......................    1,740,000    45%   1,857,000    43%   3,541,000    50%
Subscriber-owned...........................    1,087,000    28    1,135,000    27    1,611,000    23
Reseller-owned.............................    1,063,000    27    1,284,000    30    1,872,000    27
                                               ---------   ---    ---------   ---    ---------   ---
         Total.............................    3,890,000   100%   4,276,000   100%   7,024,000   100%
                                               =========   ===    =========   ===    =========   ===
</TABLE>

     Arch provides enhancements and ancillary services such as voice mail,
wireless information delivery services, personalized greetings, message storage
and retrieval, pager loss protection and pager maintenance services. Voice mail
allows a caller to leave a recorded message that is stored in Arch's
computerized

                                       129
<PAGE>   140

message retrieval center. When a message is left, the subscriber can be
automatically alerted through the subscriber's pager and can retrieve the stored
message by calling Arch's paging terminal. Personalized greetings allow the
subscriber to record a message to greet callers who reach the subscriber's pager
or voice mail box. Message storage and retrieval allows a subscriber who leaves
Arch's service area to retrieve calls that arrived during the subscriber's
absence from the service area. Pager loss protection allows subscribers who
lease pagers to limit their costs of replacement upon loss or destruction of a
pager. Pager maintenance services are offered to subscribers who own their own
equipment. Wireless information delivery allows subscribers to receive stock
quotes, news and weather through their Arch service. Arch is also in the process
of test marketing various other services that add value, and can be integrated
with existing paging services. These include, among other services, fax storage
and retrieval.

NETWORKS AND LICENSES

     Arch operates local, regional and national networks which enable its
customers to receive pages over a broad geographical area. Many of these
networks were acquired in the MobileMedia acquisition. The extensive coverage
provided by this network infrastructure provides Arch with an advantage over
some of its competitors whose networks lack comparable coverage in securing
accounts with large corporate clients and retail chains, which frequently demand
national network coverage from their paging service provider.

     Although Arch's networks provide local, regional and national coverage, its
networks operate over numerous frequencies and are subject to capacity
constraints in certain geographic markets. Although the capacity of Arch's
networks varies significantly market by market, almost all of Arch's markets
have adequate capacity to meet the demands of projected growth for the next
several years. The use of multiple frequencies adds complexity to inventory
management, customer service and order fulfillment processes. Some of Arch's
networks use older technologies and are comparatively costlier to operate.

     Arch is seeking to improve overall network efficiency by deploying paging
terminals, consolidating subscribers on fewer, higher capacity networks and
increasing the transmission speed, or baud rate, of certain of its existing
networks. Arch believes its investments in its network infrastructure will
facilitate and improve the delivery of high quality communications services
while at the same time reducing associated costs of such services.

  Nationwide Wireless Networks

     Arch operates two nationwide 900 MHz networks. As part of its acquisition
of MobileMedia, Arch acquired MobileMedia's fully operational nationwide
wireless "8875" network, which was upgraded in 1996 to incorporate high-speed
FLEX(TM) technology developed by Motorola. In addition, in 1996, MobileMedia
completed the construction of a second nationwide "5375" network that uses
FLEX(TM) technology. The use of FLEX(TM) technology significantly increases
transmission capacity and represents a marked improvement over other systems
that use older paging protocols.

  N-PCS Networks and Licenses

     N-PCS networks enable wireless communications companies to offer 2-way
messaging services and to make more efficient use of radio spectrum than do
non-PCS networks. Arch has taken the following steps to position itself to
participate in new and emerging N-PCS services and applications.

     Arch's N-PCS Licenses.  MobileMedia purchased five regional licenses
through the FCC's 1994 auction of N-PCS licenses, providing the equivalent of a
nationwide 50 kHz outbound/12.5 kHz inbound PCS system. In addition, MobileMedia
acquired a second 2-way N-PCS license for a nationwide 50 kHz outbound/12.5 kHz
inbound system. In order to retain these N-PCS licenses, Arch must comply with
specified minimum buildout requirements. With respect to each of the regional
PCS licenses purchased at the FCC's 1994 auction, Arch would be required to
build out the related PCS system to cover 150,000 sq. km. or 37.5% of each of
the five regional populations by April 27, 2000 and 300,000 sq. km. or 75% of
each of the five regional populations by April 27, 2005. With respect to the
nationwide PCS license acquired as part of the MobileMedia acquisition, Arch
built out the related PCS system to cover 750,000
                                       130
<PAGE>   141

sq. km. or 37.5% of the U.S. population by September 29, 1999 in compliance with
applicable build out requirements and is still required to extend the build out
of the related PCS system to cover 1,500,000 sq. km. or 75% of the U.S.
population by September 29, 2004. In each instance, the population percentage
will be determined by reference to population figures at the time of the
applicable deadline. Arch estimates that the costs of these minimum build-outs
would be approximately $9.0 million. Although these minimum build-outs would be
sufficient to satisfy regulatory requirements, they would not be sufficient for
Arch to provide significant N-PCS applications of the types which the combined
company intends to provide.

     Weblink Wireless, Inc.  In May 1999, Arch and Weblink Wireless, Inc.,
formerly PageMart Wireless, Inc. signed a five-year agreement for the provision
of N-PCS services. The agreement calls for Arch and Weblink to share certain
capital and operating expenses. Under the agreement, Arch can market N-PCS
advanced messaging services, including guaranteed or 1.5-way messaging and 2-way
messaging, using portions of Weblink's network in conjunction with Arch's
network. As demand for advanced messaging increases over time, Arch plans to
expand its own N-PCS network. In the interim, Arch believes its arrangements
with Weblink will provide it with more economical and broader access to N-PCS
services. Weblink previously announced similar agreements with each of
Metrocall, Inc. and Airtouch Communications, Inc.

SUBSCRIBERS AND MARKETING

     Arch's wireless communications accounts are generally businesses with
employees who travel frequently but must be immediately accessible to their
offices or customers. Arch's subscribers have historically included proprietors
of small businesses, professionals, management personnel, field sales personnel
and service forces, members of the construction industry and construction
trades, and real estate brokers and developers. After Arch's acquisition of
MobileMedia, Arch's subscribers now include medical personnel, sales and service
organizations, specialty trade organizations, manufacturing organizations and
governmental agencies. Arch believes that use of wireless communications among
retail consumers will increase significantly in the future, although consumers
do not currently account for a substantial portion of Arch's subscriber base.

     Although today Arch operates in all 50 states and all of the 100 most
populated markets in the United States, Arch originally focused on medium-sized
and small market areas with lower rates of wireless communications penetration
and attractive demographics. Arch believes that these markets will continue to
offer significant opportunities for growth, and that its national scope and
presence will also provide Arch with growth opportunities in larger markets.

     Arch markets its services through three primary sales channels: direct,
reseller and retail.

     Direct.  In the direct channel, Arch leases or sells equipment directly to
its customers and bills and services such customers. Arch markets its services
through a direct marketing and sales organization which operated approximately
375 retail stores as of September 30, 1999. Arch's direct customers range from
individuals and small- and medium-sized businesses to Fortune 500 accounts and
government agencies. Business and government accounts typically experience less
turnover than consumer accounts. The direct channel will continue to have the
highest priority among Arch's marketing and sales efforts, because of its
critical contribution to recurring revenue and projected growth. Arch has been
engaged in efforts to improve sales productivity and strengthen its direct
channel sales force, segments of which had previously suffered from high
turnover and open positions under MobileMedia's ownership and management. In
addition, Arch commenced implementing consumer direct marketing techniques in
1998. As of September 30, 1999, the direct channel accounted for approximately
86.4% of recurring revenue.

     Reseller.  In the reseller channel, Arch sells access to its transmission
networks in bulk to a third party, who then resells such services to consumers
or small businesses or other end users. Arch offers access to its network to
resellers at bulk discounted rates. The third party reseller provides customer
service, is responsible for pager maintenance and repair costs, invoices the end
user and retains the credit

                                       131
<PAGE>   142

risk of the end user, although Arch retains the credit risk of the reseller.
Because resellers are responsible for customer equipment, the capital costs that
would otherwise be borne by Arch are reduced.

     Arch's resellers generally are not exclusive distributors of Arch's
services and often have access to networks of more than one provider.
Competition among service providers to attract and maintain reseller
distribution is based primarily upon price, including the sale of equipment to
resellers at discounted rates. Arch intends to be an active participant in the
reseller channel and to concentrate on accounts that are profitable and where
longer term partnerships can be established with selected resellers. As of
September 30, 1999, the reseller channel accounted for approximately 8.7% of
recurring revenue.

     Retail.  In the retail channel, Arch sells equipment to retailers and,
after the consumer purchases the pager from the retailer, the consumer contacts
Arch to activate service. The retail channel is targeted at the consumer market
and consists primarily of national retail chains. Consumers served by the retail
channel typically purchase, rather than lease, equipment. This reduces Arch's
capital investment requirements. Subscribers obtained through retailers are
billed and serviced directly by Arch. Retail distribution permits Arch to
penetrate the consumer market by supplementing direct sales efforts. As of
September 30, 1999, the retail channel accounted for approximately 4.9% of
recurring revenue.

SOURCES OF EQUIPMENT

     Arch does not manufacture any of the messaging equipment or other equipment
used in operations. The equipment used in Arch's paging operations is generally
available for purchase from multiple sources. Arch centralizes price and
quantity negotiations for all of its operating subsidiaries to achieve cost
savings from volume purchases. Arch buys customer equipment primarily from
Motorola, NEC and Panasonic and purchased terminals and transmitters primarily
from Glenayre and Motorola. Motorola has announced its intention to discontinue
manufacturing transmitters and other paging infrastructure during 2000, although
it will continue to maintain and service existing infrastructure into the
future. Arch anticipates that equipment will continue to be available in the
foreseeable future, consistent with normal manufacturing and delivery lead
times.

     Because of the high degree of compatibility among different models of
transmitters, computers and other equipment manufactured by suppliers, Arch is
able to design its systems without being dependent upon any single source of
such equipment. Arch routinely evaluates new developments in technology in
connection with the design and enhancement of its paging systems and selection
of products to be offered to subscribers. Arch believes that its system
equipment is among the most technologically sophisticated in the paging
industry.

COMPETITION

     The wireless communications industry is highly competitive. Companies in
this industry compete on the basis of price, coverage area offered to
subscribers, available services offered, transmission quality, system
reliability and customer service. Arch believes that it will generally compete
effectively based on these factors.

     Arch has competed by maintaining competitive pricing of its products and
services, by providing broad coverage options through high-quality, reliable
transmission networks and by furnishing subscribers a superior level of customer
service. Several hundred licensed paging companies provide only local basic
numeric or tone paging service. Compared to these companies, Arch offers
wireless messaging services on a local, regional and nationwide basis. Arch also
offers enhanced services such as alphanumeric messaging, guaranteed messaging
and 2-way messaging, voice mail and voice mail notifications, news, sports,
weather reports and stock quotes and other information delivery services.

     However, the products and services Arch offers compete with a broad array
of wireless communications services. For example, 2-way cellular phones are now
offered routinely as a package with short messaging services, which are
substantially similar to numeric and alphanumeric paging. In addition,

                                       132
<PAGE>   143

rates for flat rate broadband PCS and SMR services are dropping to a price point
at which the mobile telephone services compete directly with services Arch
offers.

     Some competitors are small, privately owned companies serving one market
area but others are large diversified telecommunications companies serving many
markets. Some competitors possess financial, technical and other resources
greater than those of Arch. Major wireless messaging carriers that currently
compete with Arch in one or more markets include MCI/Worldcom/SkyTel, Sprint
PCS, Metrocall, AirTouch/Vodafone, Nextel, Bell Atlantic, Ardis Company and
BellSouth Wireless Data.

     The intensity of competition for communications service customers will
continue to increase as wireless communications products continue to be
developed and continue to offer new and different services. For example, the FCC
has created potential sources of competition by auctioning new spectrum for
wireless communications services, local multipoint distribution service and the
220-222 MHz service. Furthermore, the FCC has announced plans to auction
licenses in the general wireless communications service, a service created from
spectrum reallocated from federal government use in 1995. Moreover, entities
offering service on wireless 2-way communications technology, including
cellular, broadband PCS, N-PCS and specialized mobile radio services, as well as
mobile satellite service providers, also compete with the paging services that
Arch provides.

     Arch holds one nationwide and five regional N-PCS licenses. Competitors of
Arch also hold N-PCS licenses. Some of these competitors have substantially
greater resources than Arch. One competitor, SkyTel, currently offers a 2-way
N-PCS wireless data service from its own network. Although Arch cannot predict
the types of N-PCS services which will be offered by those companies, Arch
expects that those services will compete with the N-PCS and paging services
offered by Arch. Moreover, broadbrand PCS, cellular and enhanced SMR compete
with many of the services provided by Arch over N-PCS.

EMPLOYEES

     At September 30, 1999, Arch employed approximately 5,200 persons. None of
Arch's employees is represented by a labor union. Arch believes that its
employee relations are good. As part of its divisional reorganization and the
integration of MobileMedia, Arch anticipates a net reduction of approximately
10% of its current workforce. See "Arch Management's Discussion and Analysis of
Financial Condition and Results of Operations -- Divisional Reorganization".

TRADEMARKS

     In May 1997, Arch established a single national identity, Arch Paging, for
its paging services which previously had been marketed under various trademarks.
In addition, Arch adopted a new corporate logo, developed a corporate-wide
positioning strategy tied to customer service delivery, and launched its
Internet Web site at www.arch.com. At present, Arch has continued to market to
former MobileMedia customers under the MobileComm and MobileMedia brand names,
but is working to transition its marketing under the Arch name.

     Arch owns the service marks "Arch" and "Arch Paging", and holds federal
registrations for the service marks "MobileComm" and "MobileMedia" as well as
various other trademarks. Arch filed an application for federal registration of
the mark "Arch" in October 1999 and for the mark "Arch Communications" in
December 1999.

PROPERTIES

     At September 30, 1999, Arch owned 10 office buildings and leased office
space, including its executive offices, in approximately 375 locations in 42
states for use in its paging operations. Arch leases transmitter sites and/or
owns transmitters on commercial broadcast towers, buildings and other fixed
structures in approximately 4,800 locations in all 50 states, the U.S. Virgin
Islands and Puerto Rico. Arch's leases are for various terms and provide for
monthly lease payments at various rates. Arch believes that it will be able to
obtain additional space as needed at acceptable cost. Substantially all of
Arch's and

                                       133
<PAGE>   144

MobileMedia's tower sites were sold during 1998 and 1999 and Arch currently
rents transmitter space. As part of its divisional reorganization, Arch is
closing some office locations and redeploying other real estate assets. See
"Arch Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Divisional Reorganization".

LITIGATION

     Arch, from time to time, is involved in lawsuits arising in the normal
course of business. Arch believes that its currently pending lawsuits will not
have a material adverse effect on its financial condition or results of
operations.

THE COMPANY

     A predecessor to Arch, also named Arch Communications Group, Inc., was
incorporated in January 1986 in Delaware and conducted its operations through
wholly owned direct and indirect subsidiaries. On September 7, 1995, this
predecessor completed its acquisition of USA Mobile Communications Holdings,
Inc. through the merger of the predecessor with and into USA Mobile, which
simultaneously changed its name to Arch Communications Group, Inc. and continued
in existence as a Delaware corporation. See Note 2 to Arch's consolidated
financial statements. On June 3, 1999, Arch acquired the business of
MobileMedia, which was then operating as a debtor-in-possession under chapter 11
of the Bankruptcy Code.

                                       134
<PAGE>   145

                               ARCH'S MANAGEMENT

DIRECTORS AND EXECUTIVE OFFICERS

     The directors and executive officers of Arch are:

<TABLE>
<CAPTION>
NAME                                   AGE                           POSITION
- ----                                   ---                           --------
<S>                                    <C>    <C>
                                              Chairman of the Board, Chief Executive Officer and
C. Edward Baker, Jr..................  49     Director
Lyndon R. Daniels....................  47     President and Chief Operating Officer
John B. Saynor.......................  59     Executive Vice President and Director
J. Roy Pottle........................  40     Executive Vice President and Chief Financial Officer
                                              Executive Vice President/Technology and Regulatory
Paul H. Kuzia........................  57     Affairs
Edwin M. Banks(2)....................  37     Director
R. Schorr Berman(2)..................  51     Director
James S. Hughes(1)...................  57     Director
John Kornreich.......................  54     Director
H. Sean Mathis(1)....................  52     Director
Allan L. Rayfield(2).................  64     Director
John A. Shane(1).....................  66     Director
</TABLE>

- ---------------
(1) Member of the audit committee

(2) Member of the executive compensation and stock option committee

     C. EDWARD BAKER, JR. has served as Chief Executive Officer and a director
of Arch since 1988. Mr. Baker became Chairman of the Board of Arch in 1989. He
also served as President of Arch from 1988 to January 1998. From 1986 until
joining Arch in March 1988, Mr. Baker was President and Chief Executive Officer
of US West Paging.

     LYNDON R. DANIELS joined Arch in January 1998 as President and Chief
Operating Officer. From November 1993 to January 1998, Mr. Daniels was the
President and Chief Executive Officer of Pacific Bell Mobile Services, a
subsidiary of SBC Communications Inc. From May 1988 until November 1993, Mr.
Daniels was the Chief Financial Officer of Pactel Corp., a mobile telephone
company.

     JOHN B. SAYNOR has served as a director of Arch since 1988. Mr. Saynor has
served as Executive Vice President of Arch since 1990. Mr. Saynor is a founder
of Arch and served as President and Chief Executive Officer of Arch from 1986 to
March 1988 and as Chairman of the Board from 1986 until May 1989.

     J. ROY POTTLE joined Arch in February 1998 as Executive Vice President and
Chief Financial Officer. From October 1994 to February 1998, Mr. Pottle was Vice
President/Treasurer of Jones Intercable, Inc., a cable television operator. From
September 1989 to October 1994, he served as Vice President and Relationship
Manager at The Bank of Nova Scotia, New York Agency.

     PAUL H. KUZIA has served as Executive Vice President/Technology and
Regulatory Affairs of Arch since September 1996. He served as Vice
President/Engineering and Regulatory Affairs of Arch from 1988 to September
1996. Prior to 1988, Mr. Kuzia was director of operations at Message Center Inc.

     EDWIN M. BANKS has been a director of Arch since June 1999. He has been
employed by W.R. Huff Asset Management since 1988 and currently serves as a
portfolio manager. From 1985 until he joined W.R. Huff, Mr. Banks was employed
by Merrill Lynch & Company. Mr. Banks also serves as a director of Magellan
Health Services, formerly Charter Medical Corporation, and e.spire Corporation,
formerly American Communications Services, Inc.

     R. SCHORR BERMAN has been a director of Arch since 1986. Since 1987, he has
been the President and Chief Executive Officer of MDT Advisers, Inc., an
investment adviser. He is a director of Mercury Computer Systems, Inc. as well
as a number of private companies.

                                       135
<PAGE>   146

     JAMES S. HUGHES has been a director of Arch since 1986. Since 1987, he has
been President and Chief Executive Officer of Norwich Corporation, a real estate
investment and service firm.

     JOHN KORNREICH has been a director of Arch since June 1998. Mr. Kornreich
has served as a Managing Director of Sandler Capital Management Co., Inc. since
1988.

     H. SEAN MATHIS has been a director of Arch since June 1999. He has also
been Chairman of the Board and Chief Executive Officer of Allis Chalmers, Inc.
since January 1996 and previously served as a Vice President of that company
since 1989. From July 1996 to September 1997, Mr. Mathis was Chairman of the
Board of Universal Gym Equipment Inc., a privately owned company which filed for
protection under the Bankruptcy Code in July 1997. From 1991 to 1993, Mr. Mathis
was President of RCL Acquisition Corp., and from 1993 to 1995 he was President
and a director of RCL Capital Corporation, which was merged into DISC Graphics
in November 1995. Previously, Mr. Mathis was a director and Chief Operating
Officer of Ameriscribe Corporation. Mr. Mathis is a director of Thousand Trails,
Inc.

     ALLAN L. RAYFIELD has been a director of Arch since 1997. He has been a
consultant since 1995. From November 1993 until December 1994, Mr. Rayfield
served as Chief Executive Officer of M/A Com Inc., a microwave electrical
manufacturing company. From April 1991 until November 1993, he served as Chief
Operating Officer of M/A Com Inc. He is a director of Parker Hannifin
Corporation and Acme Metals Incorporated.

     JOHN A. SHANE has been a director of Arch since 1988. He has been the
President of Palmer Service Corporation since 1972. He has been a general
partner of Palmer Partners L.P., a venture capital firm, since 1981. He serves
as a director of Overland Data, Inc., United Asset Management Corporation and
Gensym Corporation and as a trustee of Nvest Funds.

     Arch's certificate of incorporation and bylaws provide that Arch has a
classified board of directors composed of three classes, each of which serves
for three years, with one class being elected each year. The term of Messrs.
Saynor, Shane and Mathis will expire at Arch's annual meeting of stockholders to
be held in 2000. The term of Messrs. Baker, Berman and Kornreich will expire at
Arch's annual meeting of stockholders to be held in 2001. The term of Messrs.
Hughes, Rayfield and Banks will expire at Arch's annual meeting of stockholders
to be held in 2002.

     Two of Arch's stockholders, W.R. Huff Asset Management and Whippoorwill
Associates, Inc., have the right to designate one member each for election to
Arch's board of directors. This right of designation will continue through 2002
for W.R. Huff and 2003 for Whippoorwill if the designating stockholder is still
entitled to cast at least 5% of all votes at an Arch stockholders' meeting, and
will continue afterwards if the designating stockholder is still entitled to
cast at least 10% of all such votes. Under this arrangement, Mr. Banks has been
designed by W.R. Huff and Mr. Mathis has been designed by Whippoorwill.

     The holders of Series C preferred stock have the right, voting as a
separate class, to elect one member of Arch's board of directors, and such
director has the right to be a member of any committee of the board. Mr.
Kornreich is currently the director elected by the holders of Series C preferred
stock. This right of designation will terminate if less than 50% of the Series C
preferred stock remains outstanding.

     Arch's officers are elected by the board of directors and hold office until
their successors are elected or until their earlier death, resignation or
removal.

     Most of Arch's executive officers have entered into non-competition
agreements with Arch which provide that they will not compete with Arch for one
year following termination, or recruit or hire any other Arch employee for three
years following termination. See "-- Executive Retention Agreements".

     For a discussion of the expected effects of the PageNet merger, see "The
Combined Company -- Management".

                                       136
<PAGE>   147

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     Arch and three other entities have co-founded an offshore corporation to
pursue wireless messaging opportunities in Latin America. Arch and Mr. Hughes
each contributed $250,000 to this offshore corporation and each owns
approximately 12% of its equity. Arch's Board of Directors has approved an
additional investment of $200,000 by Arch, subject to certain conditions.

     Between August 6, 1998 and October 28, 1998, Arch's board of directors
approved three full recourse, unsecured demand loans totaling $279,500 from Arch
to Mr. Baker. The loans bear interest at approximately 5% annually.

BOARD COMMITTEES

     Arch's board of directors has an audit committee and an executive
compensation and stock option committee. The audit committee reviews the annual
consolidated financial statements of Arch and its subsidiaries before their
submission to Arch's board of directors and consults with Arch's independent
public accountants to review financial results, internal financial controls and
procedures, audit plans and recommendations. The audit committee also recommends
the selection, retention or termination of independent public accountants and
approves services provided by independent public accountants prior to the
provision of such services. The compensation committee recommends to Arch's
board the compensation of executive officers, key managers and directors and
administers Arch's stock option plans. Arch's board of directors has no standing
nominating committee.

INDEMNIFICATION AND DIRECTOR LIABILITY

     Arch's certificate of incorporation eliminates the liability of its
directors for monetary damages for breaches of fiduciary duties, except in
certain circumstances involving wrongful acts, such as the breach of a
director's duty of loyalty or acts or omissions that involve intentional
misconduct or a knowing violation of law. The certificate of incorporation also
requires Arch to indemnify its directors and officers to the fullest extent
permitted by the Delaware corporations statute.

                                       137
<PAGE>   148

SUMMARY COMPENSATION TABLE

     The annual and long-term compensation of Arch's Chief Executive Officer and
other executive officers named below was as follows for the years ended December
31, 1997, 1998 and 1999:

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                             ANNUAL COMPENSATION
                                                      ----------------------------------      LONG-TERM
                                                                            OTHER ANNUAL     COMPENSATION
                                                                  BONUS     COMPENSATION    --------------
NAME AND PRINCIPAL POSITION DURING 1999        YEAR   SALARY $     $(1)        ($)(2)       OPTIONS (#)(3)
- ---------------------------------------        ----   --------   --------   ------------    --------------
<S>                                            <C>    <C>        <C>        <C>             <C>
C. Edward Baker, Jr..........................  1999   $434,337   $185,000     $  4,163         150,000
Chairman, President and Chief Executive        1998    373,742    135,000          600         151,554(4)
  Officer                                      1997    353,317    227,500          600          16,545
Lyndon R. Daniels............................  1999    313,735    203,000       23,363(5)       91,667
  President and Chief Operating Officer        1998    295,416         --      113,905(5)       46,666
  (joined Arch in January 1998)
J. Roy Pottle................................  1999    228,896    140,000        2,317          66,666
  Executive Vice President and Chief           1998    179,200         --       99,304(5)       30,000
  Financial Officer (joined Arch in February
  1998)
John B. Saynor...............................  1999    161,667     44,092        1,490          20,000
  Executive Vice President                     1998    157,646     41,770          600          17,247(6)
                                               1997    153,188     72,900          600           5,302
Paul H. Kuzia................................  1999    190,163     64,480        3,373          41,666
  Executive Vice President/Technology          1998    165,489     58,435          600          29,616(7)
  and Regulatory Affairs                       1997    157,633     77,400          600           5,629
</TABLE>

- ---------------
(1) Represents bonus paid in such fiscal year with respect to prior year.

(2) Represents Arch's matching contributions paid under Arch's 401(k) plan.

(3) No restricted stock awards or SARs were granted to any of the named
    executive officers during the years ended December 31, 1997, 1998 or 1999.

(4) Includes options to purchase 136,563 shares granted as part of Arch's
    January 16, 1998 option repricing program.

(5) Represents reimbursement for certain relocation costs and associated taxes.

(6) Includes options to purchase 11,968 shares granted as part of Arch's January
    16, 1998 option repricing program.

(7) Includes options to purchase 23,229 shares granted as part of Arch's January
    16, 1998 option repricing program.

EXECUTIVE RETENTION AGREEMENTS

     Arch is a party to executive retention agreements with a total of 17
executives, including Messrs. Baker, Daniels, Kuzia, Pottle and Saynor.
Following the merger, the PageNet change of control severance plan will provide
similar severance arrangements for PageNet executives. See "PageNet's
Management".

     The purpose of the executive retention agreements is to assure the
continued employment and dedication of the executives without distraction from
the possibility of a change in control of Arch as defined in the executive
retention agreements. The executive will be eligible to receive benefits if a
change in control occurs, and Arch terminates the executive's employment at any
time within the following 12 months except for cause, disability or death, or
the executive terminates employment for good reason, as defined in the executive
retention agreements. Such benefits will include (1) a lump sum cash severance
payment equal to a specified multiple of the executive's annual base salary in
effect at the time of the change in control plus a specified multiple of the
executive's average annual bonus paid during the
                                       138
<PAGE>   149

previous three full calendar years, (2) payment of any accrued but unpaid base
salary plus any other amounts earned but unpaid through the date of termination
and (3) any amounts or benefits required to be paid or provided to the executive
or which the executive is eligible to receive following the executive's
termination under any plan, program, policy, practice, contract or agreement of
Arch. In addition, for up to 12 months after termination, Arch must provide the
executive with life, disability, accident and health insurance benefits similar
to those previously maintained until the executive becomes reemployed with
another employer and is eligible to receive substantially equivalent benefits.
The specified multiple of salary and bonus for Messrs. Baker, Daniels, Kuzia,
Pottle and Saynor is three, and the specified multiple for the other executives
is one or two. Good reason is defined to include, among other things, a material
reduction in employment responsibilities, compensation or benefits. In the case
of Mr. Baker, good reason includes his not becoming the chief executive officer
of any entity succeeding or controlling Arch.

STOCK OPTION GRANTS

     The following options were granted to the five executive officers named in
the summary compensation table during 1998. No SARs were granted during 1999.

                       OPTION GRANTS IN LAST FISCAL YEAR

<TABLE>
<CAPTION>
                                           INDIVIDUAL GRANTS
                        -------------------------------------------------------     POTENTIAL REALIZABLE
                                        PERCENT OF                                    VALUE AT ASSUMED
                                          TOTAL                                        ANNUAL RATES OF
                                       OPTIONS/SARS                               STOCK PRICE APPRECIATION
                        OPTIONS/SARS    GRANTED TO    EXERCISE OR                    FOR OPTIONS TERM(3)
                          GRANTED      EMPLOYEE IN     BASE PRICE    EXPIRATION   -------------------------
                           (#)(1)      FISCAL YEAR    ($/SHARE)(2)      DATE        5% ($)       10% ($)
                        ------------   ------------   ------------   ----------   ----------   ------------
<S>                     <C>            <C>            <C>            <C>          <C>          <C>
C. Edward Baker,
  Jr. ................    150,000         11.64%        $7.8282       06/03/09     $738,467     $1,871,420
Lyndon R. Daniels.....     91,667          7.11          7.8282       06/03/09      451,287      1,143,650
J. Roy Pottle.........     66,666          5.17          7.8282       06/03/09      328,204        831,734
John B. Saynor........     20,000          1.55          7.8282       06/03/09       98,462        249,523
Paul H. Kuzia.........     41,666          3.23          7.8282       06/03/09      205,126        519,831
</TABLE>

- ---------------
(1) Options generally become exercisable at a rate of 20% of the shares subject
    to the option on each of the first five anniversaries of the date of grant.

(2) The exercise price is equal to the fair market value of common stock on the
    date of grant.

(3) Amounts represent hypothetical gains that could be achieved for the options
    if exercised at the end of the option terms. These gains are based on
    assumed rates of stock appreciation of 5% and 10% compounded annually from
    the date the options were granted and are not intended to forecast future
    appreciation of the price of the common stock. The named executive officers
    will realize gain upon the exercise of these options only if there is an
    increase in the price of common stock which benefits all Arch stockholders
    proportionately.

                                       139
<PAGE>   150

OPTION EXERCISES AND YEAR-END OPTION TABLE

     The named executive officers exercised stock options during 1998 as
described below. They held the following stock options as of December 31, 1998:

              AGGREGATED OPTIONS/SAR EXERCISES IN LAST FISCAL YEAR
                       AND FISCAL YEAR-END OPTIONS VALUES

<TABLE>
<CAPTION>
                                                              NUMBER OF SECURITIES   VALUE OF UNEXERCISED
                                                               UNDERLYING OPTIONS    IN-THE-MONEY OPTIONS
                                       SHARES                  AT FISCAL YEAR-END     AT FISCAL YEAR-END
                                     ACQUIRED ON    VALUE        (EXERCISABLE/           (EXERCISABLE/
                                      EXERCISE     REALIZED      UNEXERCISABLE)         UNEXERCISABLE)
NAME                                     (#)        ($)(1)            (#)                   ($)(2)
- ----                                 -----------   --------   --------------------   ---------------------
<S>                                  <C>           <C>        <C>        <C>         <C>         <C>
C. Edward Baker, Jr. ..............        --            --    72,959     228,595          --          --
Lyndon R. Daniels..................        --            --    16,335     121,998          --          --
John B. Saynor.....................        --            --     6,706      30,541          --          --
J. Roy Pottle......................        --            --    10,500      86,166          --          --
Paul H. Kuzia......................        --            --    14,371      56,911          --          --
</TABLE>

- ---------------
(1) Represents the difference between the exercise price and the fair market
    value of common stock on the date of exercise.

(2) Based on the fair market value of common stock on December 31, 1999 ($6.5938
    per share) less the option exercise price.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     The current members of Arch's compensation committee are R. Schorr Berman,
Allan L. Rayfield and John A. Shane. Messrs. Berman, Rayfield and Shane served
on the compensation committee throughout 1998, and Mr. Rayfield joined the
compensation committee upon his election as a director in July 1998.

     C. Edward Baker, Jr., the chairman and chief executive officer of Arch,
makes recommendations and participates in discussions regarding executive
compensation, but he does not participate directly in discussions regarding his
own compensation. No current executive officer of Arch has served as a director
or member of the compensation committee (or other committee serving an
equivalent function) of any other entity that has an executive officer who
serves as a director of Arch or as a member of the compensation committee of
Arch.

                                       140
<PAGE>   151

                         ARCH'S PRINCIPAL STOCKHOLDERS

     The following table sets forth certain information about the beneficial
ownership of Arch's common stock by

     - each person who is known by Arch to beneficially own more than 5% of its
       outstanding shares of common stock;

     - each current director of Arch;

     - Arch's chief executive officer and the other named executive officers;
       and

     - all current directors and executive officers of Arch as a group.

     The table provides information at November 30, 1999 and as adjusted to give
effect to the exchange offer, the PageNet merger and related transactions,
assuming that all of the outstanding discount notes and all of PageNet's
outstanding notes are tendered.

     Beneficial ownership is determined in accordance with the rules of the SEC
based upon voting or investment power over the securities. The number of shares
of common stock outstanding that is used in calculating the percentage for each
listed person includes any shares that person has the right to acquire through
exercise of warrants or options within 60 days after November 30, 1999. These
shares, however, are not deemed to be outstanding for the purpose of calculating
the percentage beneficially owned by any other person.

     Unless otherwise indicated, each person or entity listed in the table has
sole voting power and investment power, or shares such power with his spouse,
with respect to all shares of capital stock listed as owned by such person or
entity. The inclusion of shares in the table does not constitute an admission
that the named stockholder is a direct or indirect beneficial owner of the
shares.

     The table assumes

     - the conversion of Series C preferred stock into common stock at the then
       current conversion ratio of 6.7444 to 1.00; and

     - the conversion of Class B common stock into common stock at a one-for-one
       conversion ratio.

     Because Class B common stock is not entitled to vote in the election of
directors, the voting power of its holders is less than their percentages of
beneficial ownership shown in the table. Thus, the Class B stockholders
identified in notes (7), (8) and (9) to the table would be entitled to cast a
maximum of 28.4% of the votes in the election of directors, assuming that
they -- and only they -- exercised outstanding options and warrants. This
contrasts with the more than 36.2% of beneficial ownership which is obtained by
adding their individual beneficial ownership percentages in the table.

                                       141
<PAGE>   152

                                Number of Shares

<TABLE>
<CAPTION>
                                                   SHARES                     SHARES TO BE
                                                 UNDERLYING                    ISSUED IN
                                                 OPTIONS AND                   CONNECTION
                                                  WARRANTS                      WITH THE           PERCENTAGE
                                    SHARES       EXERCISABLE                    EXCHANGE     -----------------------
                                OUTSTANDING AT    PRIOR TO        TOTAL        OFFER AND          AT
                                 NOVEMBER 30,    JANUARY 29,   BENEFICIALLY     PAGENET      NOVEMBER 30,      AS
NAME                                 1999           2000          OWNED        MERGER(1)         1999       ADJUSTED
- ----                            --------------   -----------   ------------   ------------   ------------   --------
<S>                             <C>              <C>           <C>            <C>            <C>            <C>
C. Edward Baker, Jr. .........       37,434         141,122       178,550                       *             *
Lyndon R. Daniels.............        4,000          25,582        29,582                       *             *
John B. Saynor................       64,642         118,700       185,342                       *             *
J. Roy Pottle.................           --          10,500        10,500                       *             *
Paul H. Kuzia.................        1,320          17,679        18,999                       *             *
R. Schorr Berman(2)...........      655,664       1,140,115     1,795,779                         3.3%        *
James S. Hughes...............       40,196          47,503        87,699                       *             *
John Kornreich(3).............    1,757,810       2,890,373     4,648,183        361,606          8.3%         2.9%
Allan L. Rayfield.............          334           3,576         3,910                       *             *
John A. Shane(4)..............        6,856          17,686        24,542                       *             *
Edwin M. Banks(5).............    8,854,357         569,002     9,423,359                        17.6%         5.4%
H. Sean Mathis................           --           1,000         1,000                       *             *
Sandler Capital
  Management(6)...............    1,677,616       2,751,494     4,429,110        357,425          8.0%         2.7%
W.R. Huff Asset Management
  Co., L.L.C.(7)..............    8,854,357         568,002     9,422,359                        17.6%         5.4%
The Northwestern Mutual Life
  Insurance Company(8)........    3,243,629         207,544     3,451,173                         6.5%         2.0%
Whippoorwill Associates,
  Inc.(9).....................    6,020,045         439,904     6,459,949                        12.1%         3.7%
Resurgence Asset Management
  L.L.C.(10)
Resurgence Asset Management
  International L.L.C.(10)
Re/Enterprise Asset
  Management, L.L.C.(10)......    9,164,096              --     9,164,096                        17.3%         5.3%
Paul Tudor Jones II(11).......    4,080,899         126,176     4,207,075                         7.9%         2.4%
All current directors and
  executive officers of Arch
  as a group (12 persons).....   11,422,613       6,118,842    17,541,455        361,606         29.7%        10.0%
</TABLE>

- ---------------
  *  Less than 1%

 (1) Based upon ownership of Arch discount notes, PageNet common stock and
     PageNet senior subordinated notes, to the extent Arch is aware of that
     ownership.

 (2) Includes 649,330 shares and 1,122,334 shares issuable upon exercise of
     warrants held by Memorial Drive Trust, over which Mr. Berman may be deemed
     to share voting and investment power as administrator and chief executive
     officer of Memorial Drive Trust. Mr. Berman disclaims beneficial ownership
     of such shares held by Memorial Drive Trust.

 (3) Includes 1,677,616 shares and 2,751,495 shares issuable upon exercise of
     warrants beneficially owned by Sandler, over which Mr. Kornreich may be
     deemed to have voting and investment power as managing director, and 63,334
     shares beneficially owned by two limited partnerships, over which Mr.
     Kornreich may be deemed to have voting and investment power as a general
     partner. Mr. Kornreich disclaims beneficial ownership of all such shares.

 (4) Includes 350 shares and 606 shares issuable upon exercise of warrants owned
     by Palmer Service Corporation, over which Mr. Shane may be deemed to have
     voting and investment power as

                                       142
<PAGE>   153

     president and sole stockholder of Palmer Service Corporation, 159 shares
     issuable upon conversion of $8,000 principal amount of Arch's 6 3/4%
     convertible subordinated debentures due 2003 held by Palmer Service
     Corporation, and 418 shares issuable upon conversion of Arch's 6 3/4%
     convertible subordinated debentures held by Mr. Shane. See "Description of
     Outstanding Indebtedness -- Arch Convertible Debentures".

 (5) Includes 8,854,357 shares and 1,704,006 shares issuable upon exercise of
     warrants W.R. Huff manages on behalf of various discretionary accounts and
     1,306,134 shares held by The Huff Alternative Income Fund, L.P., an
     affiliate of W.R. Huff. This director is a portfolio manager of W.R. Huff.
     This director disclaims beneficial ownership of all such shares.

 (6) Sandler has sole voting and investment power over 116,000 of such shares
     and 200,500 of the shares issuable upon exercise of warrants and shared
     voting and investment power over the remaining shares and warrants.

 (7) Consists of 7,528,218 shares and 568,002 shares issuable upon exercise of
     warrants W.R. Huff manages on behalf of various discretionary accounts and
     1,306,139 shares held by The Huff Alternative Income Fund, L.P., an
     affiliate of W.R. Huff. This standby purchaser disclaims beneficial
     ownership of these shares.

 (8) Consists of 2,632,048 shares held by The Northwestern Mutual Life Insurance
     Company, 158,287 of which are issuable upon exercise of warrants, 638,686
     shares held in The Northwestern Mutual Life Insurance Company Group Annuity
     Separate Account (as to which The Northwestern Mutual Life Insurance
     Company has shared voting and investment power), 38,361 of which are
     issuable upon exercise of warrants, and 180,439 shares held by the High
     Yield Bond Portfolio of Northwestern Mutual Series Fund, Inc., a
     wholly-owned subsidiary of The Northwestern Mutual Life Insurance Company
     and a registered investment company, 10,895 shares of which are issuable
     upon exercise of warrants. Northwestern Mutual Investment Services, LLC, a
     wholly-owned subsidiary of The Northwestern Mutual Life Insurance Company
     and a registered investment advisor, serves as investment adviser to the
     High Yield Bond Portfolio of Northwestern Mutual Series Fund, Inc.

 (9) All of such shares are owned by various limited partnerships, a limited
     liability company, a trust and third party accounts for which Whippoorwill
     Associates, Inc. has discretionary authority and acts as general partner or
     investment manager.

(10) Resurgence Asset Management, L.L.C., Resurgence Asset Management
     International L.L.C. and Re/Enterprise Asset Management, L.L.C. exercise
     voting power and investment power over these shares on behalf of certain
     client accounts and accounts managed by their affiliates with which such
     powers are shared. Additionally, employees of Resurgence Asset Management,
     L.L.C., Resurgence Asset Management International L.L.C. and Re/Enterprise
     Asset Management, L.L.C. and their affiliates have an indirect beneficial
     interest in certain of the client entities which own these shares. Each of
     Resurgence Asset Management, L.L.C., Resurgence Asset Management
     International L.L.C. and Re/Enterprise Asset Management, L.L.C. disclaims
     beneficial ownership of shares owned by their clients. James B. Rubin
     shares voting and investment power in the above shares as Chief Investment
     Officer and a Manager of each of Resurgence Asset Management, L.L.C.,
     Resurgence Asset Management International L.L.C. and Re/Enterprise Asset
     Management, L.L.C. Mr. Rubin disclaims beneficial ownership of these
     shares.

(11) Consists of 1,058,816 shares held by Tudor BVI Futures, Ltd., 33,417 of
     which are issuable upon exercise of warrants, 243,346 shares held by Tudor
     Proprietary Trading, L.L.C., 8,181 of which are issuable upon exercise of
     warrants, 496,013 shares held by The Raptor Global Fund, L.P., 16,881 of
     which are issuable upon exercise of warrants, 2,176,353 shares held by The
     Raptor Global Fund Ltd., 59,516 of which are issuable upon exercise of
     warrants and 232,547 shares held by The Upper Mill Capital Appreciation
     Fund Ltd., 8,181 of which are issuable upon exercise of warrants. Mr. Jones
     may be deemed to beneficially own all of these shares because he is the
     indirect controlling equity holder of Tudor Proprietary Trading, L.L.C. and
     the controlling stockholder of Tudor Investment Corporation, which is the
     sole general partner of The Raptor Global Fund L.P.

                                       143
<PAGE>   154

     and provides investment advisory services to the Raptor Global Fund Ltd.,
     The Raptor Global Fund L.P., Tudor BVI Futures, Ltd. and The Upper Mill
     Capital Appreciation Fund Ltd.

     Each person or entity listed in the table has an address c/o Arch except
for:

     - Sandler Capital Management, 767 Fifth Avenue, 45th Floor, New York, New
       York 10153

     - W.R. Huff Asset Management Co., L.L.C., 67 Park Place, Ninth Floor,
       Morristown, NJ 07960

     - Paul Tudor Jones II, c/o Tudor Investment Corporation, 600 Steamboat
       Road, Greenwich, CT 06830

     - The Northwestern Mutual Life Insurance Company, 720 East Wisconsin
       Avenue, Milwaukee, Wisconsin 53202

     - Whippoorwill Associates, Inc., 11 Martine Avenue, White Plains, New York
       10606

     - Resurgence Asset Management L.L.C., 10 New King Street, 1st Floor, White
       Plains, New York 10604.

                                       144
<PAGE>   155

                               PAGENET'S BUSINESS

     PageNet is a leading provider of wireless communications services
throughout the United States and in the U.S. Virgin Islands, Puerto Rico and
Canada. It provides services in all 50 states and the District of Columbia,
including service in the 100 most populated markets in the United States.
PageNet also owns a minority interest in a wireless communications company in
Brazil.

     The main services of PageNet are digital and alphanumeric wireless
messaging services. Digital devices allow a subscriber to receive a numeric
message (such as a telephone number to call back or a pre-arranged code), and
alphanumeric devices allow a subscriber to receive numeric and text messages. As
of September 30, 1999, digital units represented approximately 83.5% of
PageNet's total units in service with subscribers and alphanumeric units
represented approximately 16.2% of PageNet's total units in service with
subscribers. The total units in service has grown from 4,408,000 at December 31,
1994 to more than 9,027,000 at September 30, 1999, representing a compounded
annual growth rate of approximately 17.1%. However, total units in service have
declined each quarter since their high of 10,604,000 at June 30, 1998. In
addition, PageNet sells 1.5-way services, which enable subscribers to receive
acknowledgements that their messages were delivered, 1.75-way services, which
enable subscribers to respond to messages with their messaging devices by using
pre-scripted replies, and 2-way services, which enable subscribers to initiate
messages and to respond to messages with their messaging devices by using
pre-scripted replies or by creating original replies. PageNet is currently
developing other applications for its wireless network through its wholly-owned
subsidiary Vast, as described more fully below.

STRATEGY AND RESTRUCTURING

     In February 1998, PageNet announced its intention to realign its strategy
from rapid expansion and subscriber growth towards profitable growth. The major
components of this realignment have included: (1) centralizing its key support
functions into "centers of excellence"; (2) completing the buildout of its new
advanced messaging network, and launching new, value-added advanced messaging
services for its customers; (3) developing other applications for its network to
provide "wireless solutions" to customers; and (4) focusing PageNet's sales and
marketing efforts on more profitable services, such as alphanumeric and
nationwide paging; and (5) increasing prices to certain existing customers in an
effort to reduce the number of unprofitable customers. As a result of the
restructuring, PageNet recorded a charge of $74.0 million, or $0.72 per share,
during the quarter ended March 31, 1998. In June of 1999, PageNet announced a
further reorganization involving the consolidation of certain previous
initiatives to develop "wireless solutions" into Vast.

     CENTERS OF EXCELLENCE.  In February 1998 PageNet announced it was
restructuring its domestic operations from approximately 50 decentralized field
offices to four centers of excellence. PageNet is restructuring these operations
to eliminate redundant administrative operations by consolidating certain key
support functions into the centers of excellence, including: customer service;
billing and accounting; order fulfillment; inventory management; and technical
operations. PageNet began this consolidation in 1998, and will continue its
consolidation efforts through January 2000. As of November 30, 1999,
approximately 80% of customer units placed in service indirectly through
PageNet's resellers and 38% of directly marketed customer units in service had
been consolidated into the centers of excellence. PageNet intends to suspend any
further consolidation after January 2000 pending a selection following the
merger of the operating platforms to be used by the combined company. PageNet
expects to have completed the conversion of all of customer units placed in
service by PageNet's resellers, and the approximately 50% of the directly
marketed customer units in service, as of January 2000. As a result, PageNet
will realize a portion of the anticipated cost savings resulting from its
centers of excellence initiative and will eliminate some of the duplicative
costs that have adversely affected its results from operations. However, due to
the suspension of future conversions, combined with the impact of the
contemplated merger on operations, PageNet is unable to estimate the amount of
potential cost savings resulting from the centers of excellence initiative.

                                       145
<PAGE>   156

     BUILD-OUT OF ADVANCED MESSAGING NETWORK AND DEPLOYMENT OF ADVANCED
MESSAGING SERVICES. PageNet has nearly completed the build-out of its advanced
wireless messaging network and PageNet expects to launch 2-way services over its
own network in January 2000. PageNet believes that, upon completion, its
advanced wireless messaging network will be one of the largest and most
sophisticated wireless messaging networks in North America. PageNet continues to
prepare for the launch of advanced messaging services in order to generate
additional revenue and cash flow growth and compete within the wireless
communications market.

     ESTABLISHMENT OF VAST.  Through its wholly-owned subsidiary Vast, PageNet
is commencing operations that can provide integrated wireless solutions to
connect businesses with their employees, customers and remote assets, such as
vending machines, automobiles and storage tanks. Using an expandable software
platform (Gateway), provisioning and service and support operations, Vast will
be able to provide customers with a comprehensive end-to-end wireless solution
that seamlessly connects their mobile users with the Internet or corporate data
network using wireless devices. Vast will provide the equipment, servers,
billing systems, training and support needed to offer mobile access to
enterprise applications, Internet services, messaging and e-commerce. Using the
Vast solution, a mobile workforce can stay continuously connected to enterprise
applications and perform necessary tasks while at home, in the office, on the
road, at a meeting or at a job site.

     Vast is a development stage company and, since its inception, has been
engaged primarily in product research and development and developing markets for
its products and services. Vast has incurred significant operating losses as a
result of its start-up activities. It began to market its products and services
in late 1999, and believes that revenues from sales of these products and
services will grow rapidly.

     Annex F to this joint proxy statement/prospectus describes Vast's business
in detail.

     REVIEW OF CUSTOMER ACCOUNTS AND SALES AND MARKETING STRUCTURE. PageNet has
reviewed its customers and prospects in each market in order to design a sales
and marketing structure that is more closely aligned with its customers' needs
and with PageNet's overall goal of profitable growth. This new sales structure,
which was implemented in April of 1999, enables PageNet to sell a diversified
portfolio of products to a sophisticated group of customers. This structure
includes account segmentation and focused selling skills, career paths for all
sales personnel, sales targets, training curriculums for each selling group, and
competitive compensation plans. This structure was designed to increase
PageNet's sales results and effectiveness but has not yet had a positive impact
on sales results. As a result of price increases and increased competition in
the marketplace for wireless communications services, PageNet's units in service
have decreased each quarter from the third quarter of 1998 through the third
quarter of 1999, and this trend is expected to continue through at least the
first quarter of 2000. PageNet experienced its first year-to-year increase in
average revenue per unit in 1998, although average revenue per unit has since
declined during the second and third quarters of 1999. PageNet continues to
review its pricing structure for all of its services.

SALES AND DISTRIBUTION

     PageNet's services are sold to its customers through both direct and
indirect distribution channels. The direct channel consists of selling services
to customers through local sales representatives who are PageNet employees
calling on prospects and customers or taking orders at storefront locations, as
well as sales completed through PageNet's internet store. The indirect channel
consists of selling services to customers primarily through resellers. PageNet
does not depend upon any single subscriber or reseller for a significant portion
of its net revenues.

     As of September 30, 1999, direct sales accounted for approximately 48% of
PageNet's overall units in service, and the indirect sales channel accounted for
approximately 52%. In the direct channel, PageNet charges a monthly fee and
either leases or sells its messaging devices to its customers. In the indirect
channel, PageNet provides services to resellers under marketing agreements at
wholesale monthly service rates. PageNet sells or leases messaging devices to
resellers, who sell PageNet's services to end users.

                                       146
<PAGE>   157

Resellers are responsible for all costs associated with servicing their
customers. However, in some cases, resellers may contract with PageNet to
provide billing and other customer service functions.

MARKETING

     PageNet promotes its products and services through a variety of programs,
including television, print, newspaper, yellow pages advertising, and co-op
programs with manufacturers and other third parties. Traditionally, PageNet has
focused its marketing efforts primarily on business users, who represent the
majority of its subscribers.

MESSAGING DEVICES AND TRANSMISSION EQUIPMENT

     PageNet currently purchases messaging devices from many sources,
transmitters from Glenayre Technologies, Inc. and Motorola, Inc., and wireless
messaging terminals from Glenayre. Motorola has announced its intention to
discontinue manufacturing transmitters and other paging infrastructure during
2000, although it will continue to maintain and service existing infrastructure
into the future. PageNet believes that it will be able to continue to purchase
messaging devices from multiple sources.

     PageNet's technical functions include testing of new messaging devices and
transmission equipment, designing wireless transmission systems and installing
and maintaining transmitters to support PageNet's transmission system. Because
of the compatibility among different transmitters, computers, and other
messaging equipment, PageNet can design its systems without being dependent upon
any single supplier.

     As of September 30, 1999, PageNet owned messaging devices having a net book
value of approximately $198 million.

INTERNATIONAL OPERATIONS

     PageNet provides services in Canada similar to those offered in the United
States through its wholly owned subsidiary, Paging Network of Canada Inc., and
with its Canadian partner, Madison Venture Corp. PageNet has sales operations in
Montreal, Ottawa, Quebec City, Toronto, and Vancouver. PageNet services a
geographic area containing more than 75% of the population of Canada.

     PageNet holds a minority interest in a wireless messaging company in
Brazil. PageNet, through its subsidiaries, also owns frequency licenses in the
United Kingdom, Argentina, and Chile. PageNet recorded a provision for the
impairment of the net assets of its Spanish subsidiary during the first quarter
of 1999. PageNet is not actively considering opportunities for international
expansion at this time.

COMPETITION

     PageNet has numerous competitors in all of the locations in which it
operates. Competition in most geographic markets is based primarily on price,
type and quality of service offered and geographic coverage. In addition to
other wireless messaging companies, PageNet experiences significant competition
from companies which provide real-time wireless voice communications and, more
recently, also offer basic and advanced messaging services and internet access.
Many of these competitors possess financial, technical and other resources
greater than those of PageNet. PageNet's competitors currently include wireless
messaging carriers such as AirTouch Paging/Vodafone, Arch, Bell Atlantic, Bell
South Wireless Data, MCI/WorldCom/Skytel Communications, Inc., Metrocall, Inc.,
Nextel, RSR, Sprint PCS, and WebLink Wireless, Inc. (formerly known as PageMart
Wireless).

     Future technological advances in the industry could create new services or
products which could be competitive with the services provided by PageNet.
PageNet continuously evaluates new technologies and applications in wireless
services. However, PageNet cannot guarantee that it will not be adversely
affected by technological changes in the marketplace.

                                       147
<PAGE>   158

TRADEMARKS

     PageNet markets its services under various names and marks, including
PageNet(R), PageMail(R), PageMate(R), PageNet Nationwide(R), SurePage(R),
FaxNow(R), and MessageNow(R), all of which are federally registered service
marks. PageNet's federal mark registrations must be renewed at various times
between 1999 and 2005. PageNet has filed applications with the United States
patent and trademark office to register additional names and marks.

CORPORATE ORGANIZATION

     Historically, PageNet's subsidiaries operated as independent business units
making their own staffing, administrative, operational and marketing decisions
within guidelines established by the executive officers of PageNet. Effective
December 31, 1998, PageNet merged a substantial number of its operating
subsidiaries into PageNet, Inc., a first tier subsidiary of Paging Network, Inc.
PageNet now has eight wholly-owned domestic subsidiaries. PageNet conducts its
international operations through eleven wholly and partially owned subsidiaries.

SEASONALITY

     Generally, PageNet's results of operations are not significantly affected
by seasonal factors. However, the number of holidays and adverse winter weather
in the fourth and first quarters of the year result in fewer selling days. As a
result, the growth rate of units placed in service has been somewhat lower
during these periods.

EMPLOYEES

     PageNet had approximately 4,400 employees as of September 30, 1999. Of
these, approximately 1,800 were engaged in administrative, customer service, and
technical capacities at PageNet's headquarters and its centers of excellence.
Approximately 2,600, including approximately 1,600 sales personnel, were
employed in PageNet's domestic and international offices. In addition to its
4,400 employees, PageNet had approximately 1,700 temporary workers in various
customer service and administrative roles as of September 30, 1999. As PageNet
restructures its operations, redundant administrative and support positions
currently held by fulltime employees are being eliminated and the number of
temporary workers is being reduced. PageNet eliminated approximately 800
permanent and temporary positions during 1999. None of PageNet's employees is
represented by a labor union, and PageNet believes employee relations are good.

PROPERTIES

     As of December 1, 1999, PageNet leased office space in 110 cities in 35
states in the United States and the District of Columbia, and in seven cities in
four provinces in Canada. These leases expire, subject to renewal options, on
various dates through December 31, 2007. As of December 31, 1999, PageNet is
paying annualized rent of approximately $25 million. This amount includes
amounts paid under leases that are to be closed as part of PageNet's
restructuring, but excludes any potential income from subleasing these
facilities. PageNet has announced its intention to suspend further consolidation
during 2000 pending a determination as to the infrastructure to be used by the
combined company following the merger. There are 15 leases which will be
expiring before the second quarter of 2000, and PageNet will request extensions
of these leases until December 31, 2000 if possible.

     PageNet also leases sites for its transmitters on commercial broadcast
towers, buildings, and other structures. As of December 1, 1999, PageNet leased
transmitter sites for approximately 10,000 -- 12,000 transmitters. A few local
municipalities have imposed moratoria on the designation of new transmitter
locations and/or the addition of new towers. Should these moratoria, or others,
continue for an extended period of time, it could affect PageNet's and other
wireless carriers' ability to offer coverage in those areas.

                                       148
<PAGE>   159

     In July 1996, PageNet purchased 44 acres of undeveloped land at the Legacy
Office Park in Plano, Texas for a new corporate headquarters. During 1998,
PageNet decided to lease, rather than build, a new corporate headquarters and
subsequently entered into an agreement in December 1998 with Electronic Data
Systems Corporation, the owner and developer of the Legacy Office Park, for the
marketing and resale of the property. Beginning in June 1998, PageNet leased
office space for its corporate headquarters in Dallas, Texas under a five-year
lease term.

LEGAL PROCEEDINGS

     PageNet is involved in various lawsuits arising in the normal course of
business. In management's opinion, the ultimate outcome of these lawsuits will
not have a material adverse effect on PageNet's business, financial position, or
results of operations.

                                       149
<PAGE>   160

                              PAGENET'S MANAGEMENT

EXECUTIVE OFFICERS AND DIRECTORS

     The following table sets forth the name, age and position of PageNet's
directors and executive officers as of December 1, 1999:

<TABLE>
<CAPTION>
NAME                                   AGE                           POSITION
- ----                                   ---                           --------
<S>                                    <C>    <C>
Richard C. Alberding.................  68     Director
Lynn A. Bace.........................  46     Executive Vice President and Chief Administrative
                                                Officer
Hermann Buerger......................  55     Director
Julian B. Castelli...................  31     Senior Vice President and Chief Financial Officer and
                                              Acting Chief Financial Officer of Vast
Jeffrey M. Cunningham................  46     Director
J. Barry Duncan......................  42     Vice President and Controller
Gary J. Fernandes....................  55     Director
John P. Frazee, Jr. .................  55     Chairman of the Board of Directors and Chief Executive
                                                Officer
Scott D. Grimes......................  37     Senior Vice President of Vast -- Business Development
Mark A. Knickrehm....................  37     President and Chief Operating Officer of Vast
John S. Llewellyn....................  64     Director
Robert J. Miller.....................  54     Director
Lee M. Mitchell......................  55     Director
Edward W. Mullinix, Jr. .............  46     President and Chief Operating Officer
Timothy J. Paine.....................  45     Senior Vice President -- Customer Service
Douglas R. Ritter....................  41     Senior Vice President -- Sales
William G. Scott.....................  43     Senior Vice President and Chief Technology Officer of
                                              Vast
G. Robert Thompson...................  37     Senior Vice President -- Operations Staff
Ruth Williams........................  43     Senior Vice President, General Counsel and Assistant
                                                Secretary
</TABLE>

     RICHARD C. ALBERDING has been a director of PageNet since 1994. From 1958
through 1991, Mr. Alberding held various management positions with
Hewlett-Packard Co., including Executive Vice President. Mr. Alberding also
serves as a director of Digital Microwave Corporation, Quickturn Design Systems,
Inc., Kennametal, Inc., Digital Link Corp., Sybase, Inc., Walker Interactive
Systems, Inc. and JLK Direct, Inc.

     LYNN A. BACE has served as Executive Vice President and Chief
Administrative Officer of PageNet since June 1999. She served as Executive Vice
President -- Sales and Marketing from December 1998 through June 1999, and as
Senior Vice President -- Marketing from August 1998 to December 1998. Prior to
that, Ms. Bace was employed in several executive positions with Kraft Foods,
Inc. from September 1993 to April 1997, most recently as Executive Vice
President and General Manager for a division of Kraft.

     HERMANN BUERGER has been a director of PageNet since 1998. Mr. Buerger has
held the position of Executive Vice President and General Manager of North
American Operations for Commerzbank AG since 1989. Mr. Buerger also serves as a
director of Security Capital Group, Inc. and United Dominion Industries.

     JULIAN B. CASTELLI has served as Senior Vice President and Chief Financial
Officer since June 1999. He also serves as Acting Chief Financial Officer of
Vast, a position he has held since December 1999. Mr. Castelli served as Vice
President and Treasurer for PageNet from July 1998 to June 1999. Prior to
joining PageNet, Mr. Castelli was employed by McKinsey & Company, an
international consulting firm, from August 1995 to July 1998, serving as
Engagement Manager from June 1997. Mr. Castelli served in the Corporate Finance
Department of Goldman, Sachs & Co. as an analyst from 1990 to 1993.
                                       150
<PAGE>   161

     JEFFREY M. CUNNINGHAM has been a director of PageNet since 1998. Mr.
Cunningham has served as the President of Planet Direct, an internet media
company and majority owned subsidiary of CMGI, Inc., since December 1998.
Previously, Mr. Cunningham served as President and Chief Executive Officer of
Knowledge Universe, an internet media company, from July 1998 through December
1998. From June 1993 through July 1998, Mr. Cunningham was the Group Publisher
for Forbes, Inc. Mr. Cunningham also serves as a director of Countrywide Credit,
Inc., Data General Corp. and Schindler Holdings.

     J. BARRY DUNCAN has served as Vice President and Controller for PageNet
since October 1998 and as Corporate Controller from May 1995 to October 1996.
Mr. Duncan served as Vice President of Finance for the Southwest Region of
Unisource Worldwide, Inc. from October 1996 to October 1998, and as Corporate
Controller for Dal-Tile International from February 1994 to May 1995.

     GARY FERNANDES has been a director of PageNet since 1999. Mr. Fernandes has
held the position of managing partner of Convergent Partners LLC, a private
equity capital investment firm since January 1999. Mr. Fernandes previously held
the position of Vice Chairman as well as other senior management positions with
Electronic Data Systems Corporation from 1969 through 1999. Mr. Fernandes also
serves as a director of 7-Eleven Inc. and John Wiley & Sons, Inc.

     JOHN P. FRAZEE, JR. has been a director of PageNet since 1995 and has
served as Chairman of the Board of Directors and Chief Executive Officer since
June 1999. From August 1997 through June 1999, Mr. Frazee served as Chairman of
the Board, President and Chief Executive Officer of PageNet. Mr. Frazee was a
private investor from August 1993 to August 1997. Mr. Frazee also serves as a
director of Security Capital Group, Inc., Dean Foods Company and Homestead
Village Incorporated.

     SCOTT D. GRIMES has served as Senior Vice President -- Business Development
for Vast since December 1999 and served in a similar capacity for the wireless
solutions operations of PageNet from June 1999 through December 1999. Prior to
that time he served as Senior Vice-President -- Advanced Wireless Integration
Group for PageNet from January 1999 to June 1999, and as Senior Vice
President -- Sales Development and Operations for PageNet from April 1998 to
January 1999. From 1991 to April 1998, Mr. Grimes was employed by McKinsey &
Company, an international consulting firm, where he served as a Partner
beginning in 1996.

     MARK A. KNICKREHM has served as President and Chief Operating Officer of
Vast since December 1999 and has been responsible for the wireless solutions
operations of PageNet since June 1999. He served as Executive Vice President and
Chief Financial Officer for PageNet from February 1998 through June 1999. Mr.
Knickrehm was employed by McKinsey & Company, an international consulting firm,
from 1989 to February 1998, where he served as a Partner beginning in 1995.

     JOHN S. LLEWELLYN, JR. has been a director of PageNet since 1997. From 1982
to his retirement in 1997, Mr. Llewellyn held various management positions with
Ocean Spray Cranberries, Inc., including Chief Executive Officer. Mr. Llewellyn
also serves as a director of Dean Foods Company.

     ROBERT J. MILLER has been a director of PageNet since 1999. From 1989 to
January 1999, Mr. Miller served as the governor of Nevada. Upon his retirement,
Mr. Miller became a partner in the law firm of Jones Vargas in Las Vegas,
Nevada. Mr. Miller also serves as a director of Newmont Mining Corporation and
Zenith National Insurance Corp.

     LEE M. MITCHELL has been a director of PageNet since 1991. Mr. Mitchell is
a partner in Thoma Cressey Equity Partners, successor to Golder, Thoma, Cressey,
Rauner, Inc., an investment firm for which Mr. Mitchell has been a principal
since 1994. Mr. Mitchell also serves as a director of the Chicago Stock
Exchange.

     EDWARD W. MULLINIX, JR. has served as President and Chief Operating Officer
of PageNet since June 1999. He served as Executive Vice President -- Operations
for PageNet from February 1998 through June 1999, and as Senior Vice
President -- Strategic Planning from November 1997 to February 1998. From
September 1995 to October 1997, Mr. Mullinix served as Senior Vice President of
Finance and Administration and Chief Financial Officer of The Haskell Company.
He was Vice President -- Finance for LCI, Ltd. From August 1994 to April 1995.
                                       151
<PAGE>   162

     TIMOTHY J. PAINE has served as Senior Vice President -- Customer Service
for PageNet since March 1998. Prior to joining PageNet, Mr. Paine served in
various positions for American Express Travel Related Services, Inc. from 1982
to March 1998, most recently as Vice President of Credit and Operations for the
new accounts branch of American Express Centurion Bank.

     DOUGLAS R. RITTER has served as Senior Vice President -- Sales for PageNet
since January 1999. Mr. Ritter served as Senior Vice President -- Corporate
Development for PageNet from February 1998 to January 1999 and as Vice
President -- Corporate Development for PageNet from December 1997 to February
1998. Mr. Ritter served as Vice President -- Business Planning for PageNet from
January 1996 to December 1997 and as Vice President -- New Business Development
for PageNet from July 1993 to January 1996.

     WILLIAM G. SCOTT has served as Senior Vice President and Chief Technology
Officer of Vast since December 1999 and served in a similar capacity for the
wireless solutions operations of PageNet from June 1999 through December 1999.
He served as Senior Vice President -- Systems and Technology for PageNet from
February 1997 to June 1999, and as Vice President -- Systems and Technology for
PageNet from December 1995 to February 1997. Prior to joining PageNet, Mr. Scott
served as President of Lion Software, Inc. from 1993 to 1995.

     G. ROBERT THOMPSON has served as Senior Vice President -- Staff Operations
since June 1999. He also served as Senior Vice President -- Process Improvement
for PageNet from November 1998 to June 1999. Mr. Thompson served as Vice
President -- Finance for PageNet from February 1995 to November 1998 and was
Corporate Controller for PageNet from 1990 to 1995.

     RUTH WILLIAMS has served as Senior Vice President, General Counsel and
Assistant Secretary for PageNet since May 1997. Prior to joining PageNet, Ms.
Williams was Associate General Counsel for First Data Corporation from September
1996 to April 1997. Ms. Williams was employed by Automatic Data Processing, Inc.
from 1986 to 1996, most recently as Staff Vice President and Associate General
Counsel.

COMPENSATION OF DIRECTORS

     Directors that are also full-time officers of PageNet do not receive any
additional compensation for serving on the board or its committees. Directors
who are not full-time officers receive an annual retainer of $20,000, plus
$1,500 for each meeting they attend in person, $1,000 for each teleconference
meeting in which they participate, and reimbursement for traveling costs and
other out-of-pocket expenses incurred. Directors who serve on one or more
committees receive $5,000 per year for their service. Directors who serve as a
chairman of one or more of these committees receive an additional $5,000 per
year.

     In addition, pursuant to PageNet's 1992 director compensation plan, each
non-employee director is granted an option to purchase 45,000 shares of PageNet
common stock. The exercise price is the fair market value on the date of grant.
The options vest in five equal annual installments so long as the person remains
a director of PageNet. In addition to these initial grants, subsequent grants to
purchase an additional 45,000 shares are made to each director on the date that
the options granted to such director under the 1992 director compensation plan
become fully exercisable. The exercise price for these options is also the fair
market value on the date of the grant. These options vest in five equal annual
installments so long as the person remains a director of PageNet.

     The 1992 director compensation plan also allows a director to waive his or
her right to the cash retainer and meeting fees and in lieu thereof:

     - receive the number of shares of PageNet common stock equal to the dollar
       amount of the annual retainer, meeting and other fees due for such year;

     - defer receipt of all compensation until a designated future date, and
       invest such compensation in an interest-bearing account; or

     - defer receipt of all compensation until a designated future date, and
       invest such compensation in a phantom stock account whose value will
       increase and decrease with the value of PageNet's stock.
                                       152
<PAGE>   163

In 1998, each director waived his rights to cash payments and elected to receive
deferred shares of PageNet common stock. Messrs. Alberding, Buerger, Fernandes,
Llewellyn, and Mitchell elected to defer their compensation to phantom stock
units in 1999. Messrs. Cunningham and Miller elected to receive their 1999
compensation in cash.

SUMMARY COMPENSATION TABLE

     The following table sets forth information concerning the annual and
long-term compensation paid by PageNet for services rendered in all capacities
for the years ended December 31, 1998, 1997 and 1996 of (i) PageNet's chief
executive officer, (ii) those persons who were, at December 31, 1998, the other
four most highly compensated executive officers of PageNet, and (iii) Lynn A.
Bace, executive vice president and chief administrative officer. Positions
indicated are as of December 1, 1999.

<TABLE>
<CAPTION>
                                            ANNUAL COMPENSATION                LONG-TERM COMPENSATION
                                  ----------------------------------------    ------------------------
                                                                                            SECURITIES
                                                                              RESTRICTED    UNDERLYING          ALL
                                                                                STOCK        OPTIONS           OTHER
                                  YEAR     SALARY      BONUS       OTHER      AWARDS($)      (SHARES)     COMPENSATION(1)
                                  ----    --------    --------    --------    ----------    ----------    ---------------
<S>                               <C>     <C>         <C>         <C>         <C>           <C>           <C>
John P. Frazee, Jr. ............  1998    $671,875    $430,000    $115,246(2)        --     $  100,000        $ 2,333
Chairman and                      1997     279,571(3)  150,000      50,938(4)   100,000(5)     600,000         20,000(6)
  Chief Executive Officer         1996          --          --          --           --             --         16,250(6)
Mark A. Knickrehm(7)............  1998     266,036     230,000(8)       --           --        300,000             --
  Executive Vice President &
  Chief Operating Officer of
  Vast
Edward W. Mullinix, Jr.(9)......  1998     247,916     120,000      43,158(10)        --        50,000          3,750
  President and Chief Operating   1997      45,337      60,000          --                     250,000
  Officer
William G. Scott................  1998     224,583      72,000          --           --         20,000          5,000
  Senior Vice President and
  Chief Technology Officer of     1997     215,000      80,000          --       55,313(11)    113,464          4,750
  Vast                            1996     172,982      75,000       8,942(12)        --            --             --
Ruth Williams...................  1998     220,000      74,800          --           --         20,000             --
  Senior Vice President &         1997     143,333(13)   58,000    115,250(12)        --       125,000          3,123
  General Counsel
Lynn A. Bace(14)................  1998      93,750      51,000          --           --        250,000             --
  Executive Vice President
  and Chief Administrative
  Officer
</TABLE>

- ---------------
 (1) Represents matching contributions to PageNet's 401(k) Plan, except where
     noted.

 (2) Includes housing allowance of $66,158.

 (3) Annual compensation for 1997 represents compensation for the period from
     August 4, 1997, when Mr. Frazee became chairman, president & chief
     executive officer of PageNet, through December 31, 1997.

 (4) Includes payment of $23,214 to defray expenses associated with relocation
     to the Dallas, Texas area.

 (5) Represents the fair market value on the date of grant of 11,510 shares of
     PageNet common stock awarded to Mr. Frazee on August 4, 1997.

 (6) Represents compensation for services rendered as a non-employee director of
     PageNet.

 (7) Annual compensation for 1998 represents compensation for the period from
     February 4, 1998, when Mr. Knickrehm became employed with PageNet as its
     executive vice president and chief financial officer through December 31,
     1998.

 (8) Includes a $100,000 employment bonus and $130,000 paid as an annual bonus
     for performance in 1998.

 (9) Mr. Mullinix joined PageNet on November 3, 1997 as senior vice president of
     strategic planning, and was promoted to executive vice
     president -- operations of PageNet on February 4, 1998.

(10) Includes payment of $41,589 made to Mr. Mullinix to defray expenses
     associated with relocation to the Dallas, Texas area.

                                       153
<PAGE>   164

(11) Represents the fair market value on the date of grant of 5,000 shares of
     PageNet common stock awarded to Mr. Scott on February 2, 1997, vesting at
     the rate of 20% per year beginning on February 2, 1998 through 2002,
     contingent upon meeting certain performance goals.

(12) Represents payments made to defray expenses associated with relocation to
     the Dallas, Texas area.

(13) Annual compensation for 1997 represents compensation for the period from
     May 1, 1997, when Ms. Williams became senior vice president and general
     counsel of PageNet, through December 31, 1997.

(14) Annual compensation for 1998 represents compensation for the period from
     August 19, 1998, when Ms. Bace became senior vice president of marketing
     through December 31, 1998. On December 16, 1998, Ms. Bace was elected to
     the position of executive vice president -- sales and marketing.

OPTION GRANTS IN 1998

     The following table sets forth information on grants of options to purchase
PageNet common stock during the year ended December 31, 1998, to (i) PageNet's
chief executive officer, (ii) those persons who were, at December 31, 1998, the
other four most highly compensated executive officers of PageNet, and (iii) Lynn
A. Bace, executive vice president and chief administrative officer of PageNet.

<TABLE>
<CAPTION>
                                NUMBER OF    PERCENTAGE OF
                                 SHARES      TOTAL OPTIONS
                               UNDERLYING     GRANTED TO                                        PRESENT VALUE
                                 OPTIONS       EMPLOYEES                                           ON DATE
NAME                           GRANTED (1)      IN 1998      EXERCISE PRICE   EXPIRATION DATE    OF GRANT(2)
- ----                           -----------   -------------   --------------   ---------------   -------------
<S>                            <C>           <C>             <C>              <C>               <C>
John P. Frazee, Jr. .........    100,000          2.0%          $12.9375         01/29/08        $  730,000
Mark A. Knickrehm............    300,000          5.9%           12.9375         02/04/08         2,192,100
Edward W. Mullinix, Jr. .....     50,000          1.0%           12.9375         01/29/08           365,000
William G. Scott.............     20,000            *            12.9375         01/29/08           146,000
Ruth Williams................     20,000            *            12.9375         01/29/08           146,000
Lynn A. Bace.................    250,000          4.9%            9.5625         08/19/08         1,372,000
</TABLE>

- ---------------
 *  Less than 1%

(1) All options are exercisable only so long as employment continues or within
    limited periods following termination of employment. All options have a term
    of 10 years. All options vest in five equal annual installments beginning on
    the date of the grant, except that all of such options would vest at the
    closing of the merger by virtue of a change in control of the ownership of
    PageNet.

(2) The determination of the present value of PageNet common stock on the date
    of the grant is based on the Black-Scholes pricing model. Estimated values
    under the Black-Scholes model are based on standard assumptions as to
    variables in the model such as stock price volatility, projected future
    dividend yield and interest rates. In addition, the estimated value is
    discounted for potential forfeiture due to vesting schedules. The discount
    rate is consistent with PageNet's employment turnover experience over time.
    The estimated Black-Scholes values above are based on a range of values for
    the key variable. The range reflects different values in effect on the grant
    date of the option: volatility -- ranged from .559 to .583; dividend
    yield -- 0%; turnover -- 8% per year; risk-free interest rate -- yield to
    maturity of 10-year treasury note at grant date (rates ranged from 5.41% to
    5.56%). The actual value, if any, that an executive may realize will depend
    on the excess of the stock price over the exercise price on the date the
    option is exercised. There is no assurance that the value realized by an
    executive will be at or near the value estimated using a Black-Scholes
    model. Currently, all such stock options have no value because the trading
    price of PageNet shares is below the option exercise prices.

                                       154
<PAGE>   165

AGGREGATE OPTION EXERCISES IN 1998 AND YEAR-END OPTION VALUES

     The following table sets forth information related to the unexercised
options to purchase PageNet common stock that were granted during the year ended
December 31, 1998, and prior years under PageNet's 1991 stock option plan to the
named officers and held by them at December 31, 1998.

<TABLE>
<CAPTION>
                                                                NUMBER OF UNEXERCISED          VALUE OF UNEXERCISED
                                                                    OPTIONS HELD            IN-THE-MONEY OPTIONS HELD
                                SHARES                          AT DECEMBER 31, 1998         AT DECEMBER 31, 1998(1)
                              ACQUIRED ON                    ---------------------------   ----------------------------
NAME                           EXERCISE     VALUE REALIZED   EXERCISABLE   UNEXERCISABLE   EXERCISABLE    UNEXERCISABLE
- ----                          -----------   --------------   -----------   -------------   -----------    -------------
<S>                           <C>           <C>              <C>           <C>             <C>            <C>
John P. Frazee, Jr..........       0              0            476,000        269,000           0               0
Mark A. Knickrehm...........       0              0            120,000        180,000           0               0
Edward W. Mullinix, Jr......       0              0            120,000        180,000           0               0
William G. Scott............       0              0             71,642         61,822           0               0
Ruth Williams...............       0              0             58,000         87,000           0               0
Lynn A. Bace................       0              0             50,000        200,000           0               0
</TABLE>

- ---------------
(1) Based on the difference between the exercise price of each option and $4.68
    the last reported sales price of PageNet common stock on the last trading
    date in 1998.

CONTRACTS RELATED TO EMPLOYMENT

     PageNet and Mr. Frazee entered into an employment agreement on August 4,
1997. This agreement provides that Mr. Frazee is to be employed until July 31,
1998. The agreement is automatically extended for one-year periods unless either
PageNet or Mr. Frazee notifies the other party of termination not less than 90
days prior to the beginning of any one-year renewal period. Mr. Frazee's base
salary is $675,000 and he has a target bonus of $350,000 if PageNet achieves the
objectives established by the board of directors. The employment agreement also
provides that at least 40% of the bonus is to be paid in shares of PageNet
common stock. The board of directors gave Mr. Frazee his 1997 and 1998 bonuses
in cash, with the understanding that he would use 40% or more of the bonus to
purchase Page Net common stock in the public market. In 1997, Mr. Frazee
purchased shares in excess of this requirement. Upon signing the employment
agreement, Mr. Frazee was granted options to purchase 600,000 shares of common
stock, all of which have vested. Mr. Frazee also was awarded 11,510 shares of
PageNet common stock under PageNet's 1997 restricted stock plan. In addition,
PageNet provides Mr. Frazee with transportation to and from his residence in
Florida.

CHANGE OF CONTROL SEVERANCE PLAN

     On January 20, 1999, the board of directors approved a severance plan which
would provide benefits to substantially all of PageNet's employees in the event
of a "change of control" of PageNet. "Change of control" is defined as any
merger, sale or other transaction which results in 35% or more of PageNet common
stock being held by an outsider, or any change in the composition of a majority
of the board of directors. This definition is consistent with the change of
control provisions that trigger accelerated vesting under PageNet's 1991
employee stock option plan. The severance plan provides for severance amounts
ranging from 50% to 200% of an employee's annual salary and bonus compensation.
The amount an employee will receive depends upon the employee's position at
PageNet. Payments are made in one lump sum payment if an employee suffers an
involuntary or deemed termination within 12 months after the change of control.
In contemplation of the merger, PageNet's board of directors approved an
increase in the severance percentages applicable to John P. Frazee, Mark A.
Knickrehm, Edward W. Mullinix, Jr., Lynn A. Bace and up to one other officer
from 200% to 300% of their annual salary and bonus compensation, in December of
1999.

                                       155
<PAGE>   166

                        PAGENET'S PRINCIPAL STOCKHOLDERS

     The following table sets forth information on the beneficial ownership of
PageNet's common stock as of December 1, 1999 by:

     - each person who is known by PageNet to beneficially own more than 5% of
       its outstanding shares of common stock;

     - each current director of PageNet;

     - PageNet's chief executive officer and the other named executive officers
       of PageNet; and

     - all of PageNet's current executive officers and directors as a group.

<TABLE>
<CAPTION>
                                                           NUMBER OF SHARES AND
                                                           NATURE OF BENEFICIAL      PERCENT OF
NAME                                                           OWNERSHIP(1)        COMMON STOCK(2)
- ----                                                       --------------------    ---------------
<S>                                                        <C>                     <C>
Wellington Management Company, LLP.......................       5,770,500(3)             5.6%
  75 State Street, Boston, MA 02109
Richard C. Alberding.....................................          47,307(4)               *
Hermann Buerger..........................................          41,810(5)               *
Jeffrey M. Cunningham....................................          18,000(6)               *
Gary J. Fernandes........................................           9,000(7)               *
John P. Frazee, Jr.......................................       1,006,060(8)               *
Mark A. Knickrehm........................................         166,000(9)               *
John S. Llewellyn, Jr....................................         27,437(10)               *
Robert J. Miller.........................................          9,000(11)               *
Lee M. Mitchell..........................................         71,621(12)               *
Edward W. Mullinix, Jr...................................        227,000(13)               *
William G. Scott.........................................         93,547(14)               *
Ruth Williams............................................         77,000(15)               *
All executive officers and directors as a group (19
  persons)...............................................      2,332,202(16)            2.24%
</TABLE>

- ---------------
  * Less than 1%

 (1) Unless otherwise indicated, each person has sole voting and investment
     power over the shares listed. These numbers include options vested and
     exercisable as of December 1, 1999 or within 60 days after such date.

 (2) The total number of shares of PageNet common stock outstanding as of
     December 1, 1999 is 103,960,240.

 (3) Information has been obtained from the Form 13F filed by Wellington
     Management Company, LLP as of November 15, 1999. Wellington has sole
     investment discretion and sole voting power with respect to 4,250,500 and
     2,260,500 shares, respectively. Wellington has shared investment discretion
     and shared voting power with Wellington Trust Company, NA with respect to
     1,520,000 shares. Wellington has no authority to vote 1,990,000 shares.

 (4) Includes 45,000 shares subject to options that are vested and exercisable
     within 60 days.

 (5) Includes 18,000 shares subject to options that are vested and exercisable
     within 60 days.

 (6) Includes 18,000 shares subject to options that are vested and exercisable
     within 60 days.

 (7) Includes 9,000 shares subject to options that are vested and exercisable
     within 60 days.

 (8) Includes 882,900 shares subject to options that are vested and exercisable
     within 60 days.

 (9) Includes 166,000 shares subject to options that are vested and exercisable
     within 60 days.

(10) Includes 27,000 shares subject to options that are vested and exercisable
     within 60 days.

(11) Includes 9,000 shares subject to options that are vested and exercisable
     within 60 days.

                                       156
<PAGE>   167

(12) Includes 63,000 shares subject to options that are vested and exercisable
     within 60 days.

(13) Includes 226,000 shares subject to options that are vested and exercisable
     within 60 days.

(14) Includes 85,643 shares subject to options that are vested and exercisable
     within 60 days.

(15) Includes 77,000 shares subject to options that are vested and exercisable
     within 60 days.

(16) Includes 2,154,453 shares subject to options that are vested and
     exercisable within 60 days.

                                       157
<PAGE>   168

                              THE COMBINED COMPANY

BUSINESS

     The combined company to be formed by the merger of Arch and PageNet will be
one of the leading wireless communications companies in the United States. On a
pro forma basis at September 30, 1999, the combined company would have had
approximately 16.1 million units in service, total assets of $3.0 billion and
total debt, less current maturities, of $1.8 billion, assuming that all of the
outstanding discount notes of Arch and all of the outstanding senior
subordinated notes of PageNet are exchanged for common stock. For the year ended
December 31, 1998 and the nine months ended September 30, 1999, the combined
company would have had pro forma total revenues of $1.9 billion and $1.4
billion, respectively, adjusted pro forma EBITDA of $599.0 million and $403.5
million, respectively and net loss before extraordinary item and cumulative
effect of accounting change of $257.6 million and $289.9 million, respectively.
This excludes the impact of expected operational cost synergies. For the nine
month period ended September 30, 1999, the combined company's pro forma cash
flows provided by operating activities, used in investing activities and
provided by financing activities would have been $332.6 million, $805.5 million
and $698.9 million. The adjusted pro forma cash flow information assumes that
the merger and related transactions had been effected as of January 1, 1998.
Leverage for the combined company on a pro forma basis, as measured by the ratio
of total debt to annualized adjusted pro forma EBITDA for the nine months ended
September 30, 1999, would have been 3.4:1. This also excludes the impact of
expected operational cost synergies. Adjusted pro forma EBITDA is EBITDA, net of
restructuring charges and bankruptcy related expenses, equity in loss of
affiliates, income tax benefit, interest and non-operating expenses (net),
extraordinary items and amortization of deferred gain on tower sale. See
"Unaudited Pro Forma Condensed Consolidated Financial Statements".

     Arch and PageNet believe that the combined company will be well positioned
to compete effectively in the highly competitive wireless communications
industry for the following reasons. The combination of PageNet's broad range of
wireless products and new advanced wireless network with Arch's extensive
national accounts and strong sales and marketing infrastructure should
significantly benefit both companies' operations and should position the
combined company to compete more effectively. Among other significant benefits,
the merger should give customers of the combined company greater access to an
expanded range of wireless products and services, along with greater ubiquity of
coverage and reliability with the consolidation of the two companies' networks.
Expanded service offerings will include Internet-based wireless information, as
well as such advanced services as guaranteed messaging over PageNet's advanced
wireless network. The market now includes a broader set of wireless competitors
such as broadband PCS and other wireless technologies. Arch and PageNet believe
that the combination of their strong distribution vehicles will provide a base
upon which to more effectively compete and to expand the combined company's
business beyond the historical focus on paging.

STRATEGY

     Arch expects the combined company to execute the following strategy:

     The combined company will offer expanded products and services.  The
combined company will immediately offer a broader spectrum of products and
services to a larger number of customers than either Arch or PageNet currently
offers by itself. Furthermore, the combination of PageNet's existing N-PCS
network, together with Arch's customer base, marketing abilities and innovative
customer service and support platform should facilitate the development,
commercialization and introduction of advanced communications products and
services that management believes Arch must provide in order to compete
effectively in the fast-paced, constantly changing wireless communications
industry.

     Arch intends to combine its expertise in direct marketing and retail
distribution with the technologically-advanced network over which PageNet plans
to offer an expanding array of advanced messaging services. Not only does
PageNet hold N-PCS licenses, it has invested heavily in infrastructure and
software development to develop new services to offer. The combined company will
apply Arch's marketing skill to PageNet's advanced service capabilities to
expand the number of customers using these advanced services. Arch and PageNet
believe that the size of their combined customer base will create

                                       158
<PAGE>   169

greater incentives for equipment manufacturers to engage in research and
development and the deployment of new equipment for its subscribers.

     The combination will create significant economic efficiencies.  The
combined company will also work to identify redundant managerial and
administrative functions to eliminate without material impact on customer
service. In addition, the combined company should be able to reduce its costs by
gradually improving the operating processes of the combined company and by
taking advantage of opportunities to obtain efficiency gains.

     The merger will result in a financially stronger company.  The combined
company will be financially stronger than Arch or PageNet individually. As part
of the merger, as much as $1.594 billion of Arch and PageNet debt (assuming 100%
of the Arch discount notes and PageNet senior subordinated notes are exchanged)
will be converted into Arch common stock. As a result, the combined company will
have a significantly lower overall leverage ratio. The combined company projects
$1.6 billion in annualized revenue and annualized EBITDA of $536.4 million based
on the annualized combined company's first six months of projected operations.
The combined company's leverage ratio would be reduced to less than 3.5 times
EBITDA. This reduction in leverage should assist the combined company in making
the capital investments necessary to execute its strategy.

MANAGEMENT

     The combined company's board of directors will consist of six designees of
the current Arch board, three designees of the PageNet board and up to three
designees of PageNet's three largest noteholders. If any of such noteholders do
not designate directors for themselves, Arch's current board will designate
additional directors instead, so that there may be up to nine Arch nominees.

     The board is expected to consist of the following persons:

<TABLE>
<CAPTION>
             NAME                   TERM EXPIRES      NOMINATED BY
             ----                   ------------      ------------
<S>                              <C>                  <C>           <C>
                                                      Arch
                                                      Arch
                                                      Arch          For biographical information,
                                                      Arch          see "Arch's Management"
                                                      Arch
                                                      Arch
                                                      PageNet
                                                      PageNet       For biographical information,
                                                      PageNet       see "PageNet's Management"
</TABLE>

     None of PageNet's three largest noteholders has informed Arch or PageNet
who it intends to nominate.

     Mr. Frazee will become chairman of the board of the combined company, Mr.
Baker will continue to serve as chief executive officer and Arch's other
executive officers will retain their current positions.

UNAUDITED FINANCIAL PROJECTIONS AND OPERATIONAL COST SYNERGIES

     Arch and PageNet have developed the unaudited combined company projections
contained in Annex H. The projections consist of projected operating and
financial results for the six months ending December 31, 2000 and the year
ending December 31, 2001. The projections assume that the merger and related
transactions will take place as of June 30, 2000. The projections have been
prepared for filing with the bankruptcy court if PageNet commences a bankruptcy
case.

                                       159
<PAGE>   170

     THE COMBINED COMPANY PROJECTIONS WERE NOT PREPARED TO COMPLY WITH THE
GUIDELINES FOR PROSPECTIVE FINANCIAL STATEMENTS PUBLISHED BY THE AMERICAN
INSTITUTE OF CERTIFIED PUBLIC ACCOUNTANTS. NEITHER THE INDEPENDENT ACCOUNTANTS
FOR ARCH NOR THE INDEPENDENT AUDITORS FOR PAGENET HAVE EXAMINED OR COMPILED THE
ACCOMPANYING PROJECTIONS AND ACCORDINGLY DO NOT EXPRESS AN OPINION OR ANY OTHER
FORM OF ASSURANCE WITH RESPECT TO THE PROJECTIONS, ASSUME NO RESPONSIBILITY FOR
THE PROJECTIONS AND DISCLAIM ANY ASSOCIATION WITH THE PROJECTIONS.

     ARCH AND PAGENET DO NOT PUBLISH PROJECTIONS OF THEIR RESPECTIVE ANTICIPATED
FINANCIAL POSITION OR RESULTS OF OPERATIONS. ACCORDINGLY, ARCH AND PAGENET DO
NOT INTEND, AND DISCLAIM ANY OBLIGATION TO:

     - FURNISH UPDATED COMBINED COMPANY PROJECTIONS,

     - INCLUDE SUCH UPDATED INFORMATION IN ANY DOCUMENTS WHICH MAY BE REQUIRED
       TO BE FILED WITH THE SEC, OR

     - OTHERWISE MAKE SUCH UPDATED INFORMATION PUBLICLY AVAILABLE.

     THE PROJECTIONS, ALTHOUGH PRESENTED WITH NUMERICAL SPECIFICITY, ARE BASED
UPON A SERIES OF ESTIMATES AND ASSUMPTIONS WHICH, ALTHOUGH CONSIDERED REASONABLE
BY ARCH AND PAGENET, MAY NOT BE REALIZED, AND ARE INHERENTLY SUBJECT TO
SIGNIFICANT BUSINESS, ECONOMIC AND COMPETITIVE UNCERTAINTIES AND CONTINGENCIES,
MANY OF WHICH ARE BEYOND THE CONTROL OF ARCH AND PAGENET. NO REPRESENTATIONS CAN
BE OR ARE MADE AS TO THE ACCURACY OF THE COMBINED COMPANY PROJECTIONS. SOME
ASSUMPTIONS INEVITABLY WILL NOT MATERIALIZE, AND EVENTS AND CIRCUMSTANCES
OCCURRING SUBSEQUENT TO THE DATE ON WHICH THE PROJECTIONS WERE PREPARED MAY BE
DIFFERENT FROM THOSE ASSUMED OR MAY BE UNANTICIPATED AND, ACCORDINGLY, MAY
AFFECT FINANCIAL RESULTS IN A MATERIAL AND POSSIBLY ADVERSE MANNER. THE
PROJECTIONS, THEREFORE, MAY NOT BE RELIED UPON AS A GUARANTEE OR OTHER ASSURANCE
OF THE ACTUAL RESULTS THAT WILL OCCUR. SEE "FORWARD-LOOKING STATEMENTS".

                                       160
<PAGE>   171

                    DESCRIPTION OF ARCH'S EQUITY SECURITIES

     Arch's authorized capital stock consists of 65,000,000 shares of common
stock, 10,000,000 shares of Class B common stock and 10,000,000 shares of
preferred stock, consisting of 300,000 shares of Series B preferred stock,
250,000 shares of Series C preferred stock and 9,450,000 additional shares of
preferred stock. Each share has a par value of $.01. On December 31, 1999, there
were 47,263,514 outstanding shares of common stock held by approximately
  stockholders of record, 3,968,150 outstanding shares of Class B common stock
held by three stockholders of record and 250,000 outstanding shares of Series C
preferred stock held by nine stockholders of record.

     The following summary of certain provisions of Arch common stock, Class B
common stock, preferred stock, Series C preferred stock, warrants and Arch's
certificate of incorporation and bylaws is not intended to be complete and is
qualified by reference to the provisions of applicable law and to the
certificate of incorporation and bylaws. To learn how to obtain copies of the
certificate of incorporation and bylaws, see "Where You Can Find More
Information".

COMMON STOCK

     Holders of common stock are entitled to one vote per share. They are
entitled to receive dividends when and if declared by Arch's board of directors
and to share, on the basis of their shareholdings, in the assets of Arch that
are available for distribution to its stockholders in the event of liquidation.
These rights of the common stock are subject to any preferences or participating
or similar rights of any series of preferred stock that is outstanding at the
time. Holders of common stock have no preemptive, subscription, redemption or
conversion rights. All outstanding shares of common stock are fully paid and
nonassessable. Holders of common stock do not have cumulative voting rights.

CLASS B COMMON STOCK

     The Class B common stock is identical to common stock, except that holders
of Class B common stock are not entitled to vote in the election of directors
and are entitled to 1/100th of a vote per share on all other matters. Class B
common stock and common stock vote together as a single class, except as
otherwise required by law.

     Class B common stock was originally issued only to four stockholders, who
acted as standby purchasers in connection with Arch's acquisition of
MobileMedia. Shares of Class B common stock were issued only to the extent that
the standby purchasers and their affiliates would otherwise have owned, in the
aggregate, more than 49.0% of the outstanding shares of capital stock of Arch
generally entitled to vote in the election of directors or more than 49.0% of
the voting power of the outstanding voting shares upon consummation of the
MobileMedia acquisition, assuming the conversion of all convertible securities
and assuming the exercise of all warrants held by the standby purchasers and
their affiliates. Any shares of Class B common stock transferred by any standby
purchaser to any transferee other than another standby purchaser automatically
convert into an equal number of shares of common stock. Class B Common Stock has
been used so that the issuance of stock to the standby purchasers in connection
with the MobileMedia acquisition would not trigger the change of control
repurchase provisions contained in the indentures governing certain outstanding
indebtedness of Arch. See "Description of Indebtedness".

PREFERRED STOCK

     Arch's board of directors is authorized, without any further action by the
stockholders of Arch, to issue preferred stock from time to time in one or more
series and to fix the voting, dividend, conversion, redemption and liquidation
rights and preferences of any such series and whatever other designations,
preferences and special rights Arch's board of directors may decide upon. Arch
does not have any present plans to issue shares of its preferred stock, other
than the shares of Series C preferred stock currently outstanding.

                                       161
<PAGE>   172

SERIES C PREFERRED STOCK

     The Series C preferred stock has the rights and preferences summarized
below:

     Conversion.  The Series C preferred stock was convertible into common stock
at an initial conversion rate of 6.06 shares of common stock for each share of
Series C preferred stock, subject to certain adjustments. These adjustments
include the issuance of common stock, or rights or options for common stock, at
a price less than the market price of common stock. The conversion of the Series
C preferred stock automatically adjusts on a quarterly basis to reflect the
accrual of dividends to the extent that dividends are not paid on a current
basis in cash or stock. Until April 1, 2000, the conversion rate will be
6.8804-to-1, so that 1,720,100 shares of common stock are issuable upon the
conversion of all shares of Series C preferred stock in the aggregate. This
aggregate number of common shares increases by approximately 34,000 shares per
quarter.

     Dividends.  The Series C preferred stock earns dividends at an annual rate
of 8.0% payable when declared quarterly in cash or, at Arch's option, through
the issuance of shares of common stock valued at 95% of the then prevailing
market price. If not paid quarterly, dividends accumulate and become payable
upon redemption or conversion of the Series C preferred stock or upon
liquidation of Arch.

     Voting Rights.  So long as at least 50% of the Series C preferred stock
remains outstanding, the holders of the Series C preferred stock have the right,
voting as a separate class, to designate one member of the boards of directors
of Arch and a principal subsidiary. The director has the right to be a member of
any committee of either board of directors. On all other matters, the Series C
preferred stock and the common stock vote together as a single class. Each share
of Series C preferred stock is entitled to as many votes as the number of shares
of common stock into which it is convertible (6.8804 prior to April 1, 2000).

     Redemption.  Holders of Series C preferred stock may require Arch to redeem
the Series C preferred stock in the year 2005. Arch may elect to pay the
redemption price in cash or in common stock valued at 95% of its then prevailing
market price. Series C preferred stock is subject to redemption for cash or
common stock at Arch's option in specified circumstances.

     Liquidation Preference.  Upon liquidation, dissolution or winding up of
Arch, before any distribution or payment is made to holders of common stock,
Arch must pay to the holders of Series C preferred stock $100.00 per share of
Series C preferred stock, subject to specified adjustments, plus any accrued and
unpaid dividends on such shares of Series C preferred stock. If the assets of
Arch are insufficient to permit full payment of such liquidation preferences to
the holders of Series C preferred stock, then the assets will be distributed pro
rata among the holders of the Series C preferred stock.

WARRANTS

     In connection with the MobileMedia acquisition, Arch issued:

     - warrants to acquire up to 1,225,220 shares of common stock to the standby
       purchasers and

     - warrants to acquire up to 14,861,424 shares of common stock to persons
       who were holders of record of common stock and Series C preferred stock
       on January 27, 1999.

     Each warrant represents the right to purchase one-third of one share of
common stock. The warrant exercise price is $3.01 per warrant ($9.03 per share).
This exercise price was determined by negotiations between Arch and MobileMedia.
These warrants will expire on September 1, 2001.

     As partial payment for the convertible subordinated debentures Arch
repurchased in October 1999, Arch issued warrants to purchase 540,487 shares of
common stock at $9.03 per share. These warrants expire on September 1, 2001.

     The warrant exercise price or the number of shares purchasable upon
exercise of the warrants is subject to adjustment from time to time upon the
occurrence of stock dividends, stock splits, reclassifications, issuances of
stock or options at prices below prevailing market prices and other events
                                       162
<PAGE>   173

described in the warrant agreement. Arch may irrevocably reduce the warrant
exercise price for any period of at least 20 calendar days to any amount that
exceeds the par value of common stock.

FOREIGN OWNERSHIP RESTRICTIONS

     Under the Communications Act, not more than 25% of Arch's capital stock may
be owned or voted by aliens or their representatives, a foreign government or
its representative or a foreign corporation if the FCC finds that the public
interest would be served by denying such ownership. See "Industry Overview --
Regulation". Accordingly, Arch's certificate of incorporation provides that Arch
may redeem outstanding shares of its stock from certain holders if the continued
ownership of such stock by such holders, because of their foreign citizenship or
otherwise, would place the FCC licenses held by Arch in jeopardy. Required
redemptions, if any, will be made at a price per share equal to the lesser of
the fair market value of the shares, as defined in the certificate of
incorporation, or, if such shares were purchased within one year prior to the
redemption, the purchase price of such shares.

ANTI-TAKEOVER PROVISIONS

     Certain provisions of Delaware law and Arch's certificate of incorporation
and bylaws may have the effect of delaying, making more difficult or preventing
a change in control or acquisition of Arch by means of a tender offer, a proxy
contest or otherwise. These provisions, as summarized below, are expected to
discourage certain types of coercive takeover practices and inadequate takeover
bids and to encourage persons seeking to acquire control of Arch to first
negotiate with Arch. Arch believes that the benefits of increased protection of
Arch's potential ability to negotiate with the proponent of an unfriendly or
unsolicited proposal to acquire or restructure Arch outweigh the disadvantages
of discouraging such proposals because, among other things, negotiations with
respect to such proposals could result in an improvement of their terms.

  Rights Plan

     Under Arch's preferred stock rights plan, each outstanding share of common
stock has attached to it one purchase right. Each purchase right entitles its
holder to purchase from Arch a unit consisting of one one-thousandth of a share
of Series B preferred stock at a cash purchase price of $150.00 per preferred
stock unit, subject to adjustment. The purchase rights automatically attach to
and trade together with each share of common stock.

     The purchase rights are not exercisable or transferable separately from the
shares of common stock to which they are attached until ten business days
following the earlier of:

     - a public announcement that an acquiring person, or group of affiliated or
       associated acquiring persons, has acquired, or obtained the right to
       acquire, beneficial ownership of 15% or more of the outstanding shares of
       the common stock, or up to 33% in certain specified circumstances
       described below, or

     - the commencement of a tender offer or exchange offer that would result in
       a person or group individually owning 30% or more of then outstanding
       shares of common stock.

     The purchase rights will not become exercisable, however, if the acquiring
person offers to purchase all outstanding shares of common stock and Arch's
independent directors determine that such offer is fair to Arch's stockholders
and in their best interests.

     If the purchase rights become exercisable, each holder of a purchase right,
other than the acquiring person, will have the right to use the exercise price
of the purchase right ($150.00) to purchase shares of common stock at one-half
of their then current market price. All purchase rights that are beneficially
owned by an acquiring person will become null and void in such circumstances.

                                       163
<PAGE>   174

     If an acquiring person acquires common stock and either:

     - Arch is acquired in a merger or other business combination transaction in
       which Arch is not the surviving corporation or the common stock is
       changed or exchanged, except for a merger that follows an offer
       determined to be fair by Arch's independent directors as described above,
       or

     - 50% or more of Arch's assets or earning power is sold or transferred,

then each holder of a purchase right, other than the acquiring person, will have
the right to use the exercise price of the purchase right ($150.00) to purchase
shares of common stock of the acquiring company at one-half of their then
current market price.

     The purchase rights are not currently exercisable. In connection with the
MobileMedia acquisition, Arch amended the preferred stock rights plan to permit
each standby purchaser to acquire, without becoming an acquiring person, up to
(1) the number of shares distributed to it or purchased by it in connection with
the MobileMedia acquisition, plus (2) an additional 5% of the outstanding common
stock, but in no event more than a total of 33% of such outstanding stock for
W.R. Huff, 27% for Whippoorwill, 26% for CS First Boston, 15.5% for Northwestern
Mutual or 19.0% for Resurgence. The standby purchasers will not be considered to
be a group for purposes of the preferred stock rights plan solely because of
performance of their contractual commitments as standby purchasers.

     Arch has further amended the plan to permit the PageNet merger to take
place without causing the purchase rights to become exercisable.

  Classified Board of Directors

     Arch's certificate of incorporation and bylaws provide that Arch's board of
directors will be divided into three classes, with the terms of each class
expiring in a different year. The bylaws provide that the number of directors
will be fixed from time to time exclusively by the board of directors, but shall
consist of not more than 15 nor less than three directors. A majority of the
board of directors then in office has the sole authority to fill in any
vacancies on the board of directors. The certificate of incorporation provides
that directors may be removed only by the affirmative vote of holders of at
least 80% of the voting power of all then outstanding shares of stock, voting
together as a single class.

  Stockholder Actions and Meetings

     Arch's certificate of incorporation provides that stockholder action can be
taken only at an annual or special meeting of stockholders and prohibits
stockholder action by written consent in lieu of a meeting. The certificate of
incorporation and bylaws provide that special meetings of stockholders can be
called by the chairman of the board, pursuant to a resolution approved by a
majority of the total number of directors which Arch would have if there were no
vacancies on the board of directors, or by stockholders owning at least 20% of
the stock entitled to vote at the meeting. The business permitted to be
conducted at any special meeting of stockholders is limited to the business
brought before the meeting by the chairman of the board, or at the request of a
majority of the members of the board of directors, or as specified in the
stockholders' call for a meeting.

     The bylaws set forth an advance notice procedure with regard to the
nomination of candidates for election as directors who are not nominees of the
board of directors. The bylaws provide that any stockholder entitled to vote in
the election of directors generally may nominate one or more persons for
election as directors only if detailed written notice has been given to the
Secretary of Arch within specified time periods.

  Amendment of Certain Provisions of Arch's Certificate of Incorporation and
Bylaws

     Arch's certificate of incorporation requires the affirmative vote of the
holders of at least 80% of the voting power of all then outstanding shares of
stock, voting together as a single class, to amend specified provisions of the
certificate of incorporation. These include provisions relating to the removal
of directors,

                                       164
<PAGE>   175

the prohibition on stockholder action by written consent instead of a meeting,
the procedural requirements of stockholder meetings and the adoption, amendment
and repeal of certain articles of the bylaws.

  Consideration of Non-Economic Factors in Acquisitions

     Arch's certificate of incorporation empowers Arch's board of directors,
when considering a tender offer or merger or acquisition proposal, to take into
account factors in addition to potential economic benefits to stockholders.
These factors may include: (1) comparison of the proposed consideration to be
received by stockholders in relation to the then current market price of the
capital stock, the estimated current value of Arch in a freely negotiated
transaction, and the estimated future value of Arch as an independent entity;
(2) the impact of such a transaction on the subscribers and employees of Arch
and its effect on the communities in which Arch operates; and (3) the ability of
Arch to fulfill its objectives under applicable statutes and regulations.

  Restrictions on Purchases of Stock by Arch

     Arch's certificate of incorporation prohibits Arch from repurchasing any
shares of Arch's stock from any person, entity or group that beneficially owns
5% or more of Arch's then outstanding voting stock at a price exceeding the
average closing price for the twenty trading business days prior to the purchase
date, unless a majority of Arch's disinterested stockholders approves the
transaction. A disinterested stockholder is a person who holds less than 5% of
the voting power of Arch. This restriction on purchases by Arch does not apply
to (1) any offer to purchase a class of Arch's stock which is made on the same
terms and conditions to all holders of the class of stock, (2) any purchase of
stock owned by such a 5% stockholder occurring more than two years after such
stockholder's last acquisition of Arch's stock, (3) any purchase of Arch's stock
in accordance with the terms of any stock option or employee benefit plan, or
(4) any purchase at prevailing marketing prices pursuant to a stock repurchase
program.

  "Blank Check" Preferred Stock

     Arch's board of directors is authorized, without any further action by the
stockholders of Arch, to issue preferred stock from time to time in one or more
series and to fix the voting, dividend, conversion, redemption and liquidation
rights and preferences of any such series and whatever other designations,
preferences and special rights the board of directors may determine. The
issuance of preferred stock, while providing desirable flexibility in connection
with possible financings, acquisitions and other corporate purposes, could,
among other things, adversely affect the voting power of the holders of common
stock and, under certain circumstances, be used as a means of discouraging,
delaying or preventing a change of control in Arch.

  Delaware Anti-Takeover Statute

     Section 203 of the Delaware corporations statute is applicable to publicly
held corporations organized under the laws of Delaware, including Arch. Subject
to various exceptions, Section 203 provides that a corporation may not engage in
any "business combination" with any "interested stockholder" for a three-year
period after such stockholder becomes an interested stockholder unless the
interested stockholder attained that status with the approval of the board of
directors or the business combination is approved in a prescribed manner. A
"business combination" includes mergers, asset sales and other transactions
which result in a financial benefit to the interested stockholder. Subject to
various exceptions, an interested stockholder is a person who, together with
affiliates and associates, owns 15% or more of the corporation's outstanding
voting stock or was the owner of 15% or more of the outstanding voting stock
within the previous three years. Under certain circumstances, Section 203 makes
it more difficult for an interested stockholder to effect various business
combinations with a corporation for a three-year period. The stockholders may
elect not to be governed by Section 203, by adopting an amendment to the
corporation's certificate of incorporation or bylaws which becomes effective
twelve months after adoption. Arch's certificate of incorporation and bylaws do
not exclude Arch from the restrictions imposed by Section 203.

                                       165
<PAGE>   176

It is anticipated that the provisions of Section 203 may encourage companies
interested in acquiring Arch to negotiate in advance with Arch's board of
directors.

TRANSFER AGENT AND REGISTRAR

     The transfer agent and registrar for common stock is The Bank of New York,
101 Barclay Street, New York, New York 10286.

REGISTRATION RIGHTS

     Each holder of Class B common stock has demand registration rights which
may be exercised no more than twice. Arch has also agreed to provide these
stockholders "piggyback" registration rights with respect to other offerings
filed by Arch. The holders of Series C preferred stock and the former
stockholders of PageCall are also entitled to registration rights.

                                       166
<PAGE>   177

                          DESCRIPTION OF INDEBTEDNESS

ARCH

     Arch and its principal operating subsidiaries each have substantial amounts
of outstanding indebtedness that provide necessary funding and impose various
limitations on Arch's operations.

  SENIOR CREDIT FACILITY

     A principal operating subsidiary has a senior credit facility in the
current total amount of $577.9 million with The Bank of New York, Royal Bank of
Canada, Toronto Dominion (Texas), Inc., Barclays Bank, PLC and other financial
institutions.

     The facility consists of a $175.0 million reducing revolving tranche A
facility, a $100.0 million tranche B facility and a $302.9 million tranche C
facility. The tranche A facility will be reduced on a quarterly basis commencing
on September 30, 2000 and will mature on June 30, 2005. The tranche B facility
converted into a term loan on June 27, 1999 and will be amortized in quarterly
installments commencing September 30, 2000, with an ultimate maturity date of
June 30, 2005. The tranche C facility will be amortized in annual installments
commencing December 31, 1999, with an ultimate maturity date of June 30, 2006.

     Arch and substantially all of its operating subsidiaries are either
borrowers or guarantors under the secured credit facility. Direct obligations
and guarantees under the facility are secured by a pledge of the capital stock
of various principal operating subsidiaries and by security interests in various
assets.

     Borrowings under the secured credit facility bear interest based on a
reference rate equal to either The Bank of New York's alternate base rate or The
Bank of New York's LIBOR rate, in each case plus a margin determined by
specified ratios of total debt to annualized EBITDA.

     The secured credit facility requires payment of fees on the daily average
amount available to be borrowed under the tranche A facility. These fees vary
depending on specified ratios of total debt to annualized EBITDA.

     The secured credit facility contains restrictions that limit, among other
things, Arch's operating subsidiaries' ability to:

     - declare dividends or redeem or repurchase capital stock;

     - prepay, redeem or purchase debt;

     - incur liens and engage in sale/leaseback transactions;

     - make loans and investments;

     - incur indebtedness and contingent obligations;

     - amend or otherwise alter debt instruments and other material agreements;

     - engage in mergers, consolidations, acquisitions and asset sales;

     - engage in transactions with affiliates; and

     - alter its lines of business or accounting methods.

     In addition, the secured credit facility requires Arch and its subsidiaries
to meet certain financial covenants, including ratios of EBITDA to fixed
charges, EBITDA to debt service, EBITDA to interest service and total
indebtedness to EBITDA. The senior credit facility will be amended and restated
on the date of the merger and will include a restriction on capital
expenditures, a minimum revenues test and, if less than 100% of the Arch lenders
consent to the merger, two new leverage ratio tests. For a full description of
the current version of the amended and restated senior credit facility, which is
still being

                                       167
<PAGE>   178

negotiated, see the Arch credit facilities term sheet attached to this joint
proxy statement/prospectus as Annex G.

  SUBSIDIARY'S SENIOR NOTES

     Another principal operating subsidiary has the following issues of
unsecured senior notes outstanding:

<TABLE>
<CAPTION>
         PRINCIPAL
      AMOUNT ACCRETED        INTEREST        MATURITY          INTEREST PAYMENT
    SEPTEMBER 30, 1999         RATE            DATE                 DATES
    ------------------       --------    ----------------    --------------------
<S>                          <C>         <C>                 <C>
$125.0 million.............   9 1/2%     February 1, 2004    February 1, August 1
$100.0 million.............      14%     November 1, 2004    May 1, November 1
$127.5 million.............  12 3/4%     July 1, 2007        January 1, July 1
$139.8 million.............  13 3/4%     April 15, 2008      April 15, October 1
</TABLE>

  Redemption

     The subsidiary may choose to redeem any amounts of these senior notes
during the periods indicated in the following table. The redemption prices will
equal the indicated percentages of the principal amount of the notes, together
with accrued and unpaid interest to the redemption date:

                              9 1/2% SENIOR NOTES

<TABLE>
<CAPTION>
REDEMPTION DATE                                               REDEMPTION PRICE
- ---------------                                               ----------------
<S>                                                           <C>
February 1, 1999 to January 31, 2000........................      104.750%
February 1, 2000 to January 31, 2001........................      103.167%
February 1, 2001 to January 31, 2002........................      101.583%
On or after February 1, 2002................................      100.000%
</TABLE>

                                14% SENIOR NOTES

<TABLE>
<CAPTION>
REDEMPTION DATE                                               REDEMPTION PRICE
- ---------------                                               ----------------
<S>                                                           <C>
November 1, 1999 to October 31, 2000........................      107.000%
November 1, 2000 to October 31, 2001........................      104.625%
November 1, 2001 to October 31, 2002........................      102.375%
On or after November 1, 2002................................      100.000%
</TABLE>

                              12 3/4% SENIOR NOTES

<TABLE>
<CAPTION>
REDEMPTION DATE                                               REDEMPTION PRICE
- ---------------                                               ----------------
<S>                                                           <C>
July 1, 2003 to June 30, 2004...............................      106.375%
July 1, 2004 to June 30, 2005...............................      104.250%
July 1, 2005 to June 30, 2006...............................      102.125%
On or after July 1, 2006....................................      100.000%
</TABLE>

                              13 3/4% SENIOR NOTES

<TABLE>
<CAPTION>
REDEMPTION DATE                                               REDEMPTION PRICE
- ---------------                                               ----------------
<S>                                                           <C>
April 15, 2004 to April 14, 2005............................      106.875%
April 15, 2005 to April 14, 2006............................      104.583%
April 15, 2006 to April 14, 2007............................      102.291%
On or after April 15, 2007..................................      100.000%
</TABLE>

                                       168
<PAGE>   179

     In addition, until July 1, 2001, the subsidiary may elect to use the
proceeds of a qualifying equity offering to redeem up to 35% in principal amount
of the 12 3/4% senior notes until July 1, 2001, or up to 35% in principal amount
of the 13 3/4% senior notes until April 15, 2002, at a redemption price equal to
112.75% of the principal amount of the 12 3/4 senior notes or 113.75% of the
principal amount of the 13 3/4% senior notes, together with accrued interest.
The subsidiary may make such redemption, however, only if 12 3/4% senior notes
with an aggregate principal amount of at least $84.5 million remain outstanding
immediately after giving effect to any such redemption of 12 3/4% senior notes,
and only if 13 3/4% senior notes with an aggregate principal amount of at least
$95.6 million remain outstanding immediately after giving effect to any such
redemption of 13 3/4% senior notes. Arch is not, however, obligated to redeem
any 12 3/4% senior notes or 13 3/4% senior notes with the proceeds of any equity
offering.

  Restrictive Covenants

     The indentures for the senior notes limit the ability of specified
subsidiaries to pay dividends, incur secured or unsecured indebtedness, incur
liens, dispose of assets, enter into transactions with affiliates, guarantee
parent company obligations, sell or issue stock and engage in any merger,
consolidation or sale of substantially all of their assets.

  Changes in Control

     Upon the occurrence of a change of control of Arch or a principal operating
subsidiary, each holder of senior notes has the right to require repurchase of
its senior notes for cash. The repurchase prices for the four series of senior
notes vary from 101% to 102% of the principal amount of such notes plus accrued
and unpaid interest to the date of repurchase. A change of control of a
corporation, as defined in the indentures, includes:

     - the acquisition by a person or group of beneficial ownership of the
       majority of securities having the right to vote in the election of
       directors;

     - specified types of changes in the board of directors;

     - the sale or transfer of all or substantially all of the corporation's
       assets or

     - merger or consolidation with another corporation which results in a
       person or group becoming the beneficial owner of a majority of the
       securities of the surviving corporation having the right to vote in the
       election of directors.

  Events of Default

     The following constitute events of default under the indentures:

     - a default in the timely payment of interest on the senior notes if such
       default continues for 30 days;

     - a default in the timely payment of principal of, or premium, if any, on
       any of the senior notes either at maturity, upon redemption or
       repurchase, by declaration or otherwise;

     - the borrowers' failure to observe or perform any of their other covenants
       or agreements in the senior notes or in the indenture, but generally only
       if the failure continues for a period of 30 or 60 days after written
       notice of default;

     - specified events of bankruptcy, insolvency or reorganization involving
       the borrowers;

     - a default in timely payment of principal, premium or interest on any
       indebtedness for borrowed money aggregating $5.0 million or more in
       principal amount;

     - the occurrence of an event of default as defined in any indenture or
       instrument involving at least $5.0 million aggregate principal amount of
       indebtedness for borrowed money that gives rise to the acceleration of
       such indebtedness;

                                       169
<PAGE>   180

     - the entry of one or more judgments, orders or decrees for the payment of
       more than a total of $5.0 million, net of any applicable insurance
       coverage, against the borrowers or any of their properties; or

     - the holder of any secured indebtedness aggregating at least $5.0 million
       in principal amount seeks foreclosure, set-off or other recourse against
       assets of the borrowers having an aggregate fair market value of more
       than $5.0 million.

  Arch's Discount Notes

     In March 1996, Arch issued discount notes representing $467.4 million in
aggregate principal amount at maturity. The discount notes are scheduled to
mature on March 15, 2008. The discount notes were issued at a substantial
discount from the principal amount due at maturity. Interest does not accrue on
the discount notes prior to March 15, 2001. After that date, interest will
accrue at the rate of 10 7/8% per year, payable semi-annually on March 15 and
September 15, commencing September 15, 2001.

     Arch may choose to redeem any amount of discount notes on or after March
15, 2001 at the following redemption prices, together with accrued and unpaid
interest to the redemption date:

<TABLE>
<CAPTION>
REDEMPTION DATE                                         REDEMPTION PRICE
- ---------------                                   ----------------------------
<S>                                               <C>
March 15, 2001 to March 14, 2002                  104.078% of principal amount
March 15, 2002 to March 14, 2003                  102.719% of principal amount
March 15, 2003 to March 14, 2004                  101.359% of principal amount
On or after March 15, 2004                        100.000% of principal amount
</TABLE>

     The indenture for the discount notes contains restrictive covenants, change
in control provisions and events of default that are generally comparable to
those of the senior notes described above.

     In accordance with the merger agreement, Arch will offer to exchange
66.1318 shares of Arch common stock for each $1,000 principal amount at maturity
of the discount notes. See "The Merger -- The Exchange Offers."

  Arch's Convertible Debentures

     Arch has outstanding $4.5 million in principal amount of 6 3/4% convertible
subordinated debentures due 2003. Interest is payable twice a year on June 1 and
December 1. The convertible debentures are scheduled to mature on December 1,
2003. The principal amount of the convertible debentures is currently
convertible into common stock at a conversion price of $50.25 per share at any
time prior to redemption or maturity.

     Arch may choose to redeem any amount of the convertible debentures at any
time, at the following redemption prices, together with accrued and unpaid
interest to the redemption date:

<TABLE>
<CAPTION>
REDEMPTION DATE                                         REDEMPTION PRICE
- ---------------                                   ----------------------------
<S>                                               <C>
December 1, 1997 to November 30, 1998             104.050% of principal amount
December 1, 1998 to November 30, 1999             103.375% of principal amount
December 1, 1999 to November 30, 2000             102.700% of principal amount
December 1, 2000 to November 30, 2001             102.025% of principal amount
December 1, 2001 to November 30, 2002             101.350% of principal amount
December 1, 2002 to November 30, 2003             100.675% of principal amount
On or after December 1, 2003                      100.000% of principal amount
</TABLE>

     The convertible debentures represent senior unsecured obligations of Arch
and are subordinated to senior indebtedness of Arch, as defined in the
indenture. The indenture does not contain any limitation or restriction on the
incurrence of senior indebtedness or other indebtedness or securities of Arch or
its subsidiaries.

                                       170
<PAGE>   181

     Upon the occurrence of a fundamental change, as defined in the indenture,
each holder of convertible debentures has the right to require Arch to
repurchase its convertible debentures for cash, at a repurchase price of 100% of
the principal amount of the convertible debentures, plus accrued interest to the
repurchase date. The following constitute fundamental changes:

     - acquisition by a person or a group of beneficial ownership of stock of
       Arch entitled to exercise a majority of the total voting power of all
       capital stock, unless such beneficial ownership is approved by the board
       of directors;

     - specified types of changes in Arch's board of directors;

     - any merger, share exchange, or sale or transfer of all or substantially
       all of the assets of Arch to another person, with specified exceptions;

     - the purchase by Arch of beneficial ownership of shares of its common
       stock if the purchase would result in a default under any senior debt
       agreements to which Arch is a party; or

     - distributions of common stock by Arch to its stockholders in specified
       circumstances.

     The following constitute events of default under the indenture:

     - a default in the timely payment of any interest on the convertible
       debentures if such default continues for 30 days;

     - a default in the timely payment of principal or premium on any
       convertible debenture at maturity, upon redemption or otherwise;

     - a default in the performance of any other covenant or agreement of Arch
       that continues for 30 days after written notice of such default;

     - a default under any indebtedness for money borrowed by Arch that results
       in more than $5.0 million of indebtedness being accelerated; or

     - the occurrence of certain events of bankruptcy, insolvency or
       reorganization with respect to Arch.

PAGENET INDEBTEDNESS TO BE ASSUMED BY ARCH

     The maximum aggregate principal amount of the PageNet notes that may remain
outstanding after the merger is $30 million, because the PageNet exchange offer
is subject to the requirement that at least 97.5% of the PageNet notes are
tendered and not withdrawn in the exchange offer. If any PageNet notes remain
outstanding after the merger, they will remain obligations of PageNet, which
will be a wholly owned subsidiary of Arch. Alternatively, if PageNet's exchange
offer is fully subscribed or if the merger is approved in accordance with the
terms of the prepackaged plan of reorganization under chapter 11 of the
Bankruptcy Code, none of the PageNet notes will be outstanding after the merger.

     The terms of the PageNet notes are as follows:

  8.875% senior subordinated notes due 2006

     The 8.875% notes are limited in aggregate principal amount to $300,000,000
and bear interest at the rate of 8.875% per annum, payable semi-annually on
February 1 and August 1 of each year. The 8.875% notes are subject to
redemption, as a whole or in part, at any time after February 1, 1999, at the
following redemption prices: 104.438% of the face amount in 1999, 102.959% of
the face amount in 2000, 101.479% of the face amount in 2001, and at 100% of the
face amount each year thereafter, together with accrued interest up to the date
of the redemption.

  10.125% senior subordinated notes due 2007

     The 10.125% notes are limited in aggregate principal amount to $400,000,000
and bear interest at the rate of 10.125% per annum, payable semi-annually on
February 1 and August 1 of each year. The 10.125%

                                       171
<PAGE>   182

notes are subject to redemption, as a whole or in part, at any time after August
1, 2000, at the following redemption prices: 105.0625% of the face amount in
2000, 103.3750% of the face amount in 2001, 101.6875% of the face amount in 2002
and at 100% of the face amount each year thereafter, together with accrued
interest up to the date of the redemption.

  10% senior subordinated notes due 2008

     The 10% notes are limited in aggregate principal amount to $500,000,000 and
bear interest at the rate of 10% per annum, payable semi-annually on April 15
and October 15 of each year. The 10% notes are subject to redemption, as a whole
or in part, at any time after October 15, 2001, at the following redemption
prices: 105% of the face amount in 2001, 103.333% of the face amount in 2002,
101.667% of the face amount in 2003 and at 100% of the face amount each year
thereafter, together with accrued interest up to the date of the redemption.

                                       172
<PAGE>   183

                            COMPARISON OF RIGHTS OF
                   PAGENET STOCKHOLDERS AND ARCH STOCKHOLDERS

     The rights of PageNet stockholders are currently governed by Delaware
corporate law and PageNet's certificate of incorporation and bylaws. Upon
completion of the merger, PageNet's stockholders will become stockholders of
Arch and their rights as Arch stockholders will be governed by Delaware
corporate law and Arch's certificate of incorporation and bylaws. There are a
number of differences between the rights of PageNet stockholders and Arch
stockholders. The following is a brief summary of the material differences
between the rights of Arch stockholders and the rights of PageNet stockholders.

AUTHORIZED CAPITAL

  Arch

     Arch is authorized to issue 85,000,000 shares of all classes of stock,
65,000,000 of which are shares of common stock, par value $.01 per share,
10,000,000 of which are shares of Class B common stock, par value $.01 per
share, and 10,000,000 of which are shares of preferred stock, par value $.01 per
share. Arch's board of directors is authorized, subject to Delaware corporate
law and without further approval of its stockholders, to issue shares of
preferred stock from time to time in one or more series and to fix the
designations, powers, preferences and other rights and qualifications,
limitations and restrictions on any series of preferred stock. As of December
20, 1999, there were 47,229,297 shares of common stock issued and outstanding,
3,968,150 shares of Class B common stock issued and outstanding, no shares of
Series B preferred stock issued and outstanding and 250,000 shares of Series C
convertible preferred stock issued and outstanding.

     Class B Common Stock.  Shares of Arch's Class B common stock are identical
in all respects to shares of Arch's common stock, except that:

     - a holder of Class B common stock is not entitled to vote in the election
       of directors and is entitled to 1/100th vote per share of common stock on
       all other matters voted on by Arch's stockholders;

     - shares of Class B common stock will automatically convert into an
       identical number of shares of common stock upon the transfer of Class B
       common shares to any person or entity, other than a Class B holder. A
       "Class B holder" is defined as:

        - any person or entity that received shares of Class B common stock in
          the initial distribution of those shares;

        - any person or entity that, when taken together with any person or
          entity that received shares of Class B common stock in the initial
          distribution, constitutes a "person" or "group," as defined in
          sections 13(d) and 14(d) of the Securities and Exchange Act of 1934;
          or

        - any affiliate of the preceding persons or entities.

     The holder that is transferring its shares of Class B common stock must
certify to Arch:

        - the number of shares of Class B common stock being transferred; and

        - that, to its knowledge, after due inquiry, the shares of Class B
          common stock are not being transferred to a Class B holder; and

     Shares of Class B common stock may be converted at any time into an
identical number of shares of common stock, if the holder of the Class B common
shares certifies to Arch that:

        - the holder has transferred a stated number of shares of Class B common
          stock; and

        - that, to its knowledge, after due inquiry, the shares of common stock
          are not being transferred to a Class B holder; and

provided, that the number of shares of Class B common stock being converted may
not exceed the number of shares of common stock being transferred.

                                       173
<PAGE>   184

     Series C Preferred Stock.  Arch's Series C preferred stockholders are
entitled to receive annual dividends, payable quarterly, of 8% per share. So
long as Arch's common stock remains listed on the Nasdaq National Market, Arch,
at its option, may pay dividends on the Series C preferred stock in fully
registered, fully paid and nonassessable shares of common stock, valued at 95%
of its then prevailing market price. Arch's Series C preferred stock ranks
senior to Arch's common stock and Series B preferred stock as to the payment of
dividends. Dividends on the Series C preferred stock are cumulative and accrue
on a daily basis whether or not declared by Arch's board of directors and
whether or not any funds are legally available for the payment of dividends.

     In the event of Arch's liquidation, dissolution or winding up, Arch must
pay to the holders of Series C preferred stock $100.00 per share of Series C
preferred stock plus all accrued and unpaid dividends. If the assets of Arch are
insufficient to permit full payment of such liquidation preferences to the
holders of Series C preferred stock, then the assets will be distributed pro
rata among the holders of Series C preferred stock. Arch's Series C preferred
stock ranks senior to Arch's common stock and Series B junior preferred stock,
as to the distribution of assets upon the liquidation, dissolution or winding up
of Arch.

     Series C preferred stockholders may convert their shares of Series C
preferred stock into shares of Arch common stock at a rate determined by
dividing $100.00 per share, plus all accrued and unpaid dividends, by a
conversion price of $16.38 per share. The conversion of Series C preferred stock
automatically adjusts on a quarterly basis to reflect the accrual of dividends
to the extent that dividends are not paid on a current basis in cash or stock.
Until April 1, 2000, the conversion rate will be 6.8804 to 1, so that 1,720,100
shares of Arch common stock are issuable upon the conversion of all shares of
Series C preferred stock in the aggregate. This aggregate number of common
shares increases by approximately 34,000 shares per quarter.

     In addition, on or after the third anniversary of the issuance of the
Series C preferred stock, Arch is entitled to cause the conversion of all of the
shares of Series C preferred stock into shares of Arch common stock at a rate
determined by dividing $100.00 per share, plus all accrued and unpaid dividends,
by a conversion price of $16.38 per share, provided, however, that Arch may not
convert the Series C preferred stock unless the average closing price for its
common stock for the thirty trading days prior to the conversion is greater than
$32.76 per share. Arch is not entitled to cause the conversion of any Series C
preferred stock at any time prior to the third anniversary of the issuance of
the Series C preferred stock.

     On or after the seventh anniversary of the issuance of the Series C
preferred stock, each Series C preferred stockholder may require Arch, at Arch's
sole option, to either:

     - redeem its shares of Series C preferred stock, in whole or in part, in
       cash, at a price equal to $100.00 per share, plus all accrued and unpaid
       dividends; or

     - so long as Arch's common stock is listed on the Nasdaq National Market
       System or other national securities exchange, convert its shares of
       Series C preferred stock into fully registered, fully paid and
       nonassessable shares of Arch common stock, valued at 95% of its then
       prevailing market price.

     On or after the third anniversary of the issuance of the Series C preferred
stock, Arch has the right to redeem all, but not less than all, of the
outstanding shares of Series C preferred stock, in cash, at a price equal to
$100.00 per share, plus all accrued and unpaid dividends, plus a "make whole
payment". The "make whole payment" is equal to:

     - On or after the seventh anniversary of the issuance of the Series C
       preferred stock, zero;

     - On or after the fifth anniversary, but prior to the seventh anniversary,
       of the issuance of the Series C preferred stock, an amount equal to the
       excess, if any, of:

        - an amount sufficient to provide a Series C preferred stockholder with
          a compounded internal rate of return of 20%, measured from the
          original issuance date of the Series C preferred stock

                                       174
<PAGE>   185

          to the date of redemption, based on an initial investment of $100.00
          per share of Series C preferred stock, over

        - $100.00, plus all accrued and unpaid dividends, per share of Series C
          preferred stock; and

     - On or after the third anniversary, but prior to the fifth anniversary, of
       the issuance of the Series C preferred stock, an amount equal to the
       excess, if any, of:

        - an amount sufficient to provide a Series C preferred stockholder with
          a compounded internal rate of return of 25%, measured from the
          original issuance date of the Series C preferred stock to the date of
          redemption, based on an initial investment of $100.00 per share of
          Series C preferred stock, over

        - $100.00, plus all accrued and unpaid dividends, per share of Series C
          preferred stock.

     Upon a change of control of Arch, each Series C preferred stockholder will
have the right to require Arch, at Arch's option, to either:

     - redeem its shares of Series C preferred stock, in cash, at a price equal
       to 105% of $100.00 per share, plus all accrued and unpaid dividends; or

     - convert its shares of Series C preferred stock, at a price equal to 105%
       of $100.00 per share, plus all accrued and unpaid dividends, into fully
       registered, fully paid and nonassessable shares of Arch common stock,
       valued at 95% of their market price.

     Each share of Arch's Series C preferred stock is entitled to one vote for
each share of Arch common stock into which a share of Series C preferred stock
could then be converted. Series C preferred stockholders are entitled to vote,
together with common stockholders, upon all matters submitted to a vote of
Arch's common stockholders. In addition, so long as at least 50% of the shares
of Series C preferred stock remains outstanding, the holders of Series C
preferred stock have the right voting as a separate class, to designate one
member of the boards of directors of Arch and a principal subsidiary. The
director has the right to be a member of any committee of either board of
directors. Each share of Series C preferred stock is entitled to as many votes
as the number of shares of Arch common stock into which it is convertible
(6.8804 prior to April 1, 2000).

     Unless approved by a majority of the outstanding shares of Series C
preferred stock, voting together as a single class, Arch may not:

     - authorize, increase the authorized number of, or issue any shares of
       stock ranking senior to the Series C preferred stock or, so long as at
       least 50% of the shares of Series C preferred stock issued on the
       original issuance date remain outstanding, on a parity with the Series C
       preferred stock;

     - increase the authorized number of, or issue any shares of Series C
       preferred stock;

     - amend Arch's certificate of incorporation so as to reduce the number of
       authorized shares of Series C preferred stock below the number then
       outstanding or adversely affect the powers, preferences or special rights
       of the Series C preferred stock; or

     - reclassify any shares of stock so as to rank senior to the Series C
       preferred stock or, so long as at least 50% of the shares of Series C
       preferred stock issued on the original issuance date remain outstanding,
       on a parity with the Series C preferred stock.

     In addition, at any time prior to the third anniversary of the issuance of
the Series C preferred stock, Arch may not participate in any merger or
consolidation, in which its outstanding securities are converted into
securities, cash or other property, or sell all or substantially all of its
assets without the prior approval a majority of the outstanding shares of Series
C preferred stock, voting as a single class, unless the conditions in any of the
following paragraphs are satisfied:

     - at least 50% of the total consideration to be received by Arch or its
       stockholders is cash and the consideration payable to the Series C
       preferred stockholders for each share of Series C preferred

                                       175
<PAGE>   186

       stock or on an "as converted" basis with respect to the common stock
       underlying each share of Series C preferred stock is not less than the
       greater of (i) $150.00 or (ii) an amount sufficient to provide a Series C
       preferred stockholder with a compounded internal rate of return of 30%,
       measured from the original issuance date of the Series C preferred stock
       to the date of redemption, based on an initial investment of $100.00 per
       share of Series C preferred stock, provided that this is not meant to
       limit the amount that a Series C preferred stockholder may be entitled to
       receive on an "as converted" basis;

     - less than 50% of the total consideration to be received by Arch or its
       stockholders is cash, the Series C preferred stock is assumed by the
       surviving entity and the surviving entity maintains a ratio of total
       consolidated debt, including preferred stock, to total consolidated
       operating cash flow that does not exceed 6.5 to 1; or

     - if the conditions in the preceding two paragraphs are not satisfied, Arch
       has offered, at its election, to redeem the Series C preferred stock in
       cash at a price per share equal to the greater of (i) $150.00 or (ii) an
       amount sufficient to provide a Series C preferred stockholder with a
       compounded internal rate of return of 30%, measured from the original
       issuance date of the Series C preferred stock to the date of redemption,
       based on an initial investment of $100.00 per share of Series C preferred
       stock.

     Each Series C preferred stockholder is entitled to a preemptive right,
unless waived by a majority of the outstanding shares of Series C preferred
stock, to purchase on a pro rata basis any "new securities" that Arch proposes
to issue if the issuance reflects a price per share for Arch's common stock that
is less than $16.38. "New securities" are defined as any shares of Arch common
stock, any rights, options or warrants to purchase shares of common stock and
any securities that may be converted into shares of common stock, except that
the definition of "new securities" does not include:

     - securities issued in the acquisition of another corporation;

     - shares of, or options or other rights to purchase, common stock issued to
       employees, officers, directors or consultants of Arch pursuant to any
       arrangement approved by Arch's board of directors;

     - shares of common stock issuable upon conversion of outstanding preferred
       stock or other convertible securities; or

     - stock issued in connection with a stock split, stock dividend,
       recapitalization, reclassification or other similar events.

  PageNet

     PageNet is authorized to issue 275,000,000 shares of all classes of stock,
250,000,000 of which are shares of common stock, par value $.01 per share, and
25,000,000 of which are shares of preferred stock, par value $.01 per share. As
of December 1, 1999, there were 103,960,240 shares of common stock issued and
outstanding and no shares of preferred stock issued and outstanding.

STOCKHOLDERS RIGHTS AGREEMENT

  Arch

     Arch's preferred stock rights plan is described under "Description of
Arch's Equity Securities -- Anti-takeover Provisions -- Rights Plan".

  PageNet

     Under PageNet's stock purchase rights plan, each outstanding share of
PageNet common stock has attached to it one common share purchase right. Each
purchase right entitles its holder to purchase from PageNet one share of PageNet
common stock at a cash purchase price of $150.00 per share. The purchase rights
automatically attach to and trade together with each share of PageNet common
stock.

                                       176
<PAGE>   187

     The purchase rights are not exercisable or transferable separately from the
shares of PageNet common stock to which they are attached until ten business
days following the earlier of:

     - a public announcement that an acquiring person, or group of affiliated or
       associated acquiring persons, has acquired, or obtained the right to
       acquire, beneficial ownership of 20%;

     - the commencement or announcement of a tender offer or exchange offer that
       would result in a person or group individually owning 20% or more of the
       then outstanding shares of PageNet common stock; or

     - the declaration of the board of directors that a person which has become
       the beneficial owner of more than 10% of PageNet's then outstanding
       shares of common stock is an adverse person. A person may be deemed an
       adverse person if (a) the board determines, after a reasonable inquiry,
       that such person's ownership is likely to cause PageNet to either
       repurchase such shares or place pressure on PageNet to enter into a
       transaction that not serve the long term best interests of PageNet but
       would provide such person with a short term financial gain or (b) such
       ownership is likely to have a material adverse impact on the business or
       prospects of PageNet.

     PageNet's board of directors may redeem the rights at a price of $.01 per
right, in whole or in part, at any time prior to ten business days following:

     - the first public announcement that a person has become an acquiring
       person;

     - the declaration by the board of directors that a person is an adverse
       person; or

     - the expiration of the rights on September 24, 2004.

Thereafter, the rights may be redeemed in connection with certain acquisitions
not involving any acquiring person or adverse person or in certain circumstances
following a disposition of shares by the acquiring person or adverse person.

     If a purchase right becomes exercisable, each holder of a purchase right,
other than an acquiring person, will have the right to purchase at an exercise
price of $150.00, shares of PageNet common stock at a price equal to one-half of
their current market price. All purchase rights that are beneficially owned by
an acquiring person will become null and void in such circumstances.

     If an acquiring person acquires common stock and:

     - PageNet is acquired in a merger or other business combination transaction
       in which PageNet is not the surviving corporation or the common stock is
       changed or exchanged; or

     - 50% or more of PageNet's assets or earning power is sold or transferred;

each holder of a purchase right, other than the acquiring person, will have the
right to use the exercise price of the purchase right ($150.00) to purchase
shares of common stock of the acquiring company at one-half of their then
current market price.

BOARDS OF DIRECTORS

  Arch

     Arch's certificate of incorporation divides its board of directors, not
including any directors that may be elected by the preferred stockholders, into
three classes of directors that are as nearly equal in number as possible with
three-year terms. As a result, approximately one-third of PageNet's directors,
not including the directors elected by preferred stockholders, if any, are
elected each year. A quorum of directors consists of a majority of Arch's board
of directors.

  PageNet

     PageNet's certificate of incorporation divides its board of directors into
three classes of directors that are as nearly equal in number as possible with
three-year terms. As a result, approximately one-third of

                                       177
<PAGE>   188

PageNet's board of directors is elected each year. A quorum of directors
consists of a majority of PageNet's directors then in office.

NUMBER, FILLING OF VACANCIES AND REMOVAL OF DIRECTORS

  Arch

     Currently, Arch's board of directors has nine members. Directors can be
removed, with or without cause, at any annual or special meeting of
stockholders, the notice for which must state that the removal of a director is
among the purposes of the meeting, by the vote of stockholders holding at least
80% of the voting power of Arch's outstanding stock entitled to vote generally
in the election of directors, voting together as a single class.

     Directors elected to Arch's board of directors by the series B preferred
stockholders can be removed, with or without cause, only by the series B
preferred stockholders entitled to vote in the election of those directors.
Vacancies created by the resignation, death or removal of a director elected by
the series B preferred stockholders will be filled at a special meeting called
for that purpose by the series B preferred stockholders.

     The holders of Series C preferred stock have the right, voting as a
separate class, to elect one member of Arch's board of directors, and such
director has the right to be a member of any committee of the board.

  PageNet

     Currently, PageNet has eight members on its board of directors. Directors
can be removed, with or without cause, at any annual or special meeting of
stockholders, the notice for which must state that the removal of a director is
among the purposes of the meeting, by the vote of stockholders holding at least
80% of the voting power of PageNet's outstanding stock entitled to vote
generally in the election of directors, voting together as a single class.

INDEMNIFICATION

  Arch

     Arch's certificate of incorporation provides that, to the fullest extent
permitted by Delaware corporate law, Arch will indemnify any person who was or
is a party, or is threatened to be made a party, to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative, other than an action by or in the right of Arch, because the
person:

     - was a director, officer, employee or agent of Arch; or

     - is or was serving as a director, officer, employee or agent of any other
       entity at Arch's request, against any and all expenses (including
       attorneys' fees), judgments, fines and amounts paid in settlement
       actually or reasonably incurred by the person in connection with the
       action, suit or proceeding.

     The person must have acted in good faith and in a manner that the person
reasonably believed to be in, or not opposed to, the best interests of Arch and,
with respect to any criminal actions, had no reasonable cause to believe the
conduct was unlawful. The termination of any action, suit or proceedings by
judgment, order, settlement, conviction or upon a plea of nolo contendere or its
equivalent, will not, by itself, create a presumption that the person did not
meet the required standard of conduct.

                                       178
<PAGE>   189

     Arch's certificate of incorporation provides that Arch may indemnify any
person who was or is a party, or is threatened to be made a party, to any
threatened, pending or completed action or suit by or in the right of Arch to
procure a judgment in its favor, because the person:

     - is or was a director, officer, employee or agent of Arch; or

     - is or was serving as a director, officer, employee or agent of any other
       entity at Arch's request, against expenses (including attorneys' fees)
       actually and reasonably incurred by the person in connection with the
       defense or settlement of the action or suit.

     The person must have acted in good faith and in a manner that the person
reasonably believed to be in, or not opposed to, the best interests of Arch,
except that Arch will not indemnify any person for any claim, issue or matter in
which the person has been adjudged to be liable to Arch, unless and only to the
extent that the court in which the action or suit was brought determines
otherwise.

     Arch's bylaws provide that Arch's obligation, if any, to indemnify any
person will be reduced by any amount that the person may receive as
indemnification from any other entity or from insurance.

     Arch's bylaws provide that to the extent a director, officer, employee or
agent of Arch, or person serving as a director, officer, employee or agent of
another entity at Arch's request, has been successful on the merits or otherwise
in the defense of any action, suit or proceeding, or in the defense of any
claim, issue or matter therein, he or she will be indemnified against expenses
(including attorneys' fees) actually and reasonably incurred by him or her in
connection with the defense of the action, suit, proceeding, claim, issue or
matter.

     Arch's bylaws provide that Arch's indemnification provisions will apply to
a resulting corporation and, to the extent the board of directors of the
resulting corporation decides, all constituent corporations, including any
constituent of a constituent, absorbed in a consolidation or merger which, if
its separate existence had continued, would have had the power and authority to
indemnify its directors, officers and employees or agents. Therefore, any person
who is or was a director, officer, employee or agent of a constituent
corporation, or is or was serving as a director, officer, employee or agent of
another entity at the request of the constituent corporation, will stand in the
same position under Arch's indemnification provisions with respect to the
resulting or surviving corporation as he or she would have stood with respect to
the constituent corporation if its separate existence had continued.

     Arch's certificate of incorporation enables Arch to advance expenses to an
officer or director who is defending any civil, criminal, administrative or
investigative action, suit or proceeding if the person promises to repay the
expenses if he or she is ultimately determined not to qualify for
indemnification by Arch. Expenses incurred by other employees and agents may be
similarly paid on terms and conditions, if any, as Arch's board of directors
deems appropriate.

     Arch's indemnification and advancement of expenses continues after the
person is no longer a director, officer, employee or agent and inures to the
benefit of the person's heirs, executor and administrators. Indemnification and
advancement of expenses are not exclusive of any other rights to which those
seeking indemnification or advancement of expenses may be entitled under any:

     - bylaw;

     - agreement; or

     - vote of stockholders or disinterested directors.

     Arch may purchase and maintain insurance on behalf of any person who is or
was a director, officer, employee or agent of Arch, or is or was serving as a
director, officer, employee or agent of any other entity at Arch's request,
against any liability asserted against and incurred by the person in his or her
capacity, or arising out of his or her status, as a director, officer, employee
or agent, whether or not Arch would have the power under its certificate of
incorporation to indemnify the person against the liability.

                                       179
<PAGE>   190

     If the claim for indemnification is not paid in full by Arch within 30 days
after receipt of a written claim, the claimant may, at any time thereafter, sue
Arch to recover the unpaid amount plus, if successful in whole or in part, the
expenses incurred in prosecuting the claim. Arch may use as a defense to such
action that the claimant did not meet the required standard of conduct as set
forth in Delaware corporate law for Arch to indemnify the claimant for the
amount claimed, but the burden of proving the defense will be on Arch. Neither
Arch's failure to make a prior determination that indemnification of the
claimant is proper because he or she met the applicable standard of conduct nor
its actual determination that the claimant has not met the applicable standard
of conduct, will be a defense to the action or create a presumption that the
claimant did not meet the applicable standard of conduct.

  PageNet

     PageNet's certificate of incorporation provides that, to the fullest extent
authorized by Delaware corporate law, PageNet will indemnify any person who was
or is a party, or is threatened to be made a party, to any threatened, pending
or completed action, suit or proceeding, whether civil, criminal,
administrative, investigative or other, including appeals, because the person:

     - is or was a director, officer, employee or agent of PageNet; or

     - is or was serving as a director, officer, employee or agent of any other
       entity at PageNet's request, against all expenses, liability and loss
       (including attorneys' fees, judgments, fines, ERISA excise taxes and
       penalties, and amounts paid or to be paid in settlement) reasonably
       incurred or suffered by the person in connection with the action, suit or
       proceeding.

     PageNet's bylaws provide that PageNet will indemnify any person who was or
is a party, or is threatened to be made a party, to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative, other than an action by or in the right of PageNet, because the
person:

     - is or was an officer of PageNet; or

     - is or was serving as a director or officer of any other entity at
       PageNet's request, against expenses (including attorneys' fees),
       judgments, fines and amounts paid in settlement actually and reasonably
       incurred by the person in connection with the action, suit or proceeding.

     The person must have acted in good faith and in a manner that the person
reasonably believed to be in, or not opposed to, the best interests of PageNet
and, with respect to any criminal actions, had no reasonable cause to believe
the conduct was unlawful. The termination of any action, suit or proceedings by
judgment, order, settlement, conviction or upon a plea of nolo contendere or its
equivalent, will not, by itself, create a presumption that the person did not
meet the required standard of conduct.

     PageNet's bylaws provide that PageNet will indemnify any person who was or
is a party, or is threatened to be made a party, to any threatened, pending or
completed action, suit or proceeding by or in the right of PageNet to procure a
judgment in its favor, because the person:

     - is or was an officer of PageNet; or

     - is or was serving as a director or officer of any other entity at
       PageNet's request, against expenses (including attorneys' fees) actually
       and reasonably incurred by the person in connection with the defense or
       settlement of the action or suit.

     The person must have acted in good faith and in a manner that the person
reasonably believed to be in, or not opposed to, the best interests of PageNet,
except that PageNet will not indemnify any person for any claim, issue or matter
in which the person has been adjudged to be liable to PageNet, unless and only
to the extent that the court in which the action or suit was brought determines
otherwise.

     PageNet's bylaws provide that to the extent an officer of PageNet, or
person serving as a director or officer of another entity at PageNet's request,
has been successful on the merits or otherwise in the defense of any action,
suit or proceeding, or in the defense of any claim, issue or matter therein, he
or she
                                       180
<PAGE>   191

will be indemnified against expenses (including attorneys' fees) actually and
reasonably incurred by him or her in connection with the defense of the action,
suit, proceeding, claim, issue or matter.

     PageNet's bylaws provide that PageNet's indemnification provisions will
apply, in addition to a resulting corporation, to any constituent corporation,
including any constituent of a constituent, absorbed in a consolidation or
merger which, if its separate existence had continued, would have had the power
and authority to indemnify its directors and officers. Therefore, any person who
is or was a director or officer of a constituent corporation, or is or was
serving as a director or officer of another corporation at the request of the
constituent corporation, will stand in the same position with respect to the
resulting corporation under PageNet's indemnification provisions as he or she
would have stood with respect to the constituent corporation if its separate
existence had continued.

     PageNet's bylaws enable PageNet to advance expenses to an officer of
PageNet, or a person serving as a director or officer of any other entity at
PageNet's request, who is defending any civil or criminal action, suit or
proceeding if the person promises to repay the expenses if he or she is
ultimately determined not to qualify for indemnification by PageNet.

     PageNet's indemnification and advancement of expenses continues after the
person is no longer an officer, employee or person serving as a director or
officer of any other entity at PageNet's request, and inures to the benefit of
the person's heirs, executors and administrators. Indemnification and
advancement of expenses are not exclusive of any other rights to which those
seeking indemnification or advancement of expenses may be entitled under any:

     - bylaw;

     - agreement; or

     - vote of stockholders or disinterested directors.

     PageNet may purchase and maintain insurance on behalf of any person who is
or was an officer of PageNet, or is or was serving as a director or officer of
any other entity at PageNet's request, against any liability asserted against
and incurred by the person in his or her capacity, or arising out of his or her
status, as a director, officer, employee or agent, whether or not PageNet would
have the power to indemnify the person against the liability.

SPECIAL MEETINGS OF STOCKHOLDERS

  Arch

     Arch's certificate of incorporation provides that only the chairman of the
board, a majority of the total number of directors which Arch would have if
there were no vacancies or holders of not less than 20% of the shares of Arch's
outstanding stock entitled to vote generally in the election of directors,
voting together as a single class, may call a special meeting of stockholders.
The business permitted to be conducted at any special stockholders' meeting is
limited to business brought before the meeting by the chairman of the board, at
the request of a majority of the board of directors or as specified in a written
request by the holders of 20% of the shares of Arch's outstanding stock entitled
to vote generally in the election of directors, voting together as a single
class.

  PageNet

     PageNet's certificate of incorporation provides that only the chairman of
the board or the president may call a special meeting of stockholders, within
ten days after receipt of a written request of a majority of PageNet's board of
directors. The business permitted to be conducted at any special stockholders'
meeting is limited to business brought before the meeting by the chairman of the
board, the president, or at the request of a majority of the board of directors.

                                       181
<PAGE>   192

ADVANCE NOTICE PROVISIONS FOR STOCKHOLDER PROPOSALS OTHER THAN ELECTION OF
DIRECTORS AT AN ANNUAL MEETING

  Arch

     Arch's bylaws provide that a stockholder may propose that business be
brought before an annual stockholders' meeting if written notice of such
proposal is delivered to and received by Arch's secretary at Arch's principal
executive office not less than 80 days prior to the annual meeting. If notice of
the date of the annual meeting or public disclosure of the date of the annual
meeting is given less than 90 days prior to the date of the annual meeting, then
the stockholder's notice must be received not later than the 10th day following
the date on which notice of the meeting was mailed or was publicly announced.

  PageNet

     PageNet's bylaws provide that a stockholder may propose that business be
brought before an annual stockholders' meeting if written notice of such
proposal is delivered to and received by PageNet's senior vice president,
general counsel and assistant secretary at PageNet's principal executive office
not more than 120 days nor less than 80 days prior to the anniversary date of
the preceding year's annual meeting. If the date of the meeting has changed more
than 30 days from the preceding year, then the stockholder's notice must be
received not later than the 15th day following the date on which notice of the
meeting was mailed or was publicly announced, whichever occurred first.

ADVANCE NOTICE PROVISIONS FOR STOCKHOLDER NOMINATIONS OF DIRECTORS

  Arch

     Arch's bylaws provide that a stockholder may nominate a person for election
to the board of directors at an annual or special stockholders' meeting if
written notice is delivered to and received by Arch's secretary at Arch's
principal executive office not less than 80 days prior to the annual or special
meeting. If notice of the date of the annual or special meeting or public
disclosure of the date of the meeting is given less than 90 days prior to the
date of the annual or special meeting, then the stockholder's nomination must be
received not later than the 10th day following the date on which the
announcement of the meeting date was communicated to stockholders.

  PageNet

     PageNet's bylaws provide that a stockholder may nominate a person for
election to the board of directors at an annual or special stockholders' meeting
if written notice is delivered to and received by PageNet's senior vice
president, general counsel and assistant secretary at PageNet's principal
executive office not more than 120 days nor less than 80 days prior to the
anniversary date of the preceding year's annual meeting or the date of the
special meeting. If the date of the annual meeting has changed more than 30 days
from the preceding year or the date of the special meeting was not publicly
announced more than 90 days prior to the meeting, then the stockholder's notice
must be received not later than the 15th day following the date on which notice
of the annual or special meeting was mailed or was publicly announced, whichever
occurred first.

LIQUIDATION

  Arch

     Arch's certificate of incorporation contains no liquidation provision.

  PageNet

     PageNet's certificate of incorporation provides that any vote authorizing
liquidation of PageNet or proceedings for its dissolution may provide, subject
to the rights of creditors and the rights expressly provided for particular
classes or series of stock, for the pro rata distribution of PageNet's assets to
its

                                       182
<PAGE>   193

stockholders, wholly or in part in kind, whether in cash or other property. The
vote may also authorize PageNet's board of directors to determine the valuation
of PageNet's assets for the purpose of liquidation and may divide, or authorize
the board of directors to divide, PageNet's assets, or any part of them, among
its stockholders in a manner that each stockholder will receive a proportionate
amount in value of PageNet's cash or property upon liquidation or dissolution,
even though each stockholder may not receive a strictly proportionate share of
each asset.

AMENDMENTS TO BYLAWS

  Arch

     Arch's certificate of incorporation provides that its board of directors is
authorized to adopt, amend or repeal Arch's bylaws. Bylaws adopted by Arch's
board of directors may be amended or repealed by the board of directors or by a
majority stockholder vote, except that Arch's certificate of incorporation
requires the vote of at least 80% of Arch's outstanding shares of capital stock
entitled to vote generally in the election of directors, voting together as a
single class, to amend, repeal or adopt any provisions inconsistent with the
bylaws related to:

     - when and where stockholders' meetings may be held and the business
       permitted to be conducted at annual meetings of stockholders;

     - the business permitted to be conducted at special meetings of
       stockholders and who may call those special meetings;

     - the notice and quorum requirements for stockholder meetings;

     - the requirements for stockholders to bring proposals before an annual
       meeting of stockholders;

     - the voting procedures at meetings of stockholders and the use of
       inspectors of election;

     - the requirements for stockholders to nominate persons for election as
       directors;

     - the size of the board of directors;

     - the election and classification of directors;

     - the removal of directors and the filling of vacancies on the board of
       directors; and

     - the amendment of Arch's bylaws.

  PageNet

     The provisions in PageNet's certificate of incorporation relating to the
amendment of PageNet's bylaws are similar to those in Arch's certificate of
incorporation, except that, PageNet's certificate of incorporation does not
require an 80% vote of PageNet's outstanding shares of capital stock to amend,
repeal or adopt provisions inconsistent with the bylaws related to when and
where stockholders' meetings may be held, the business permitted to be conducted
at annual meetings of stockholders or the voting procedures at meetings of
stockholders and the use of inspectors of election.

REDEMPTION

  Arch

     Outstanding shares of Arch's stock are always subject to redemption by
Arch, by action of Arch's board of directors, if, in the judgment of the board
of directors, the action should be taken to prevent the loss of, or to secure
the reinstatement of, any license or franchise from any governmental agency that
is held by Arch or any of its subsidiaries to conduct any portion of their
business and which license or

                                       183
<PAGE>   194

franchise is conditioned upon some or all of Arch's stockholders possessing
prescribed qualifications. The terms and conditions of any such redemption will
be as follows:

     - the redemption price will equal the lesser of (i) the average closing
       price for the shares of stock for the 45 days preceding the notice of
       redemption, or (ii) the purchase price of shares of stock, if the shares
       were purchased within one year of the redemption date by a person whose
       stockholdings, either individually or taken together with the
       stockholdings of any other person, may result in the loss of, or the
       failure to secure the reinstatement of, any license or franchise from any
       governmental agency;

     - the redemption price may be paid in cash, in debt or equity securities of
       Arch or any of its subsidiaries or in any combination of cash and
       securities;

     - if Arch is to redeem less than all the shares of stock held by a person
       whose stockholdings, either individually or taken together with the
       stockholdings of any other person, may result in the loss of, or the
       failure to secure the reinstatement of, any license or franchise from any
       governmental agency, the selection of the shares to be redeemed will be
       determined by Arch's board of directors;

     - at least 30 days' written notice of the redemption date must be given to
       the holders of the shares of stock to be redeemed, provided that the date
       of the written notice may be the redemption date if the cash and/or
       securities used effect the redemption are placed in trust for the benefit
       of the holders of the shares of stock to be redeemed and are subject to
       immediate withdrawal upon surrender of the stock certificates;

     - from and after the redemption date, any and all rights of the holders of
       the shares of stock to be redeemed will terminate and the holders will
       only be entitled to receive the cash and/or securities payable upon
       redemption; and

     - any other terms and conditions as Arch's board of directors may
       determine.

  PageNet

     Shares of PageNet's common stock are not subject to redemption by PageNet.
Shares of any series of PageNet's preferred stock will be subject to redemption
by PageNet as set forth in the resolutions adopted by PageNet's board of
directors that authorize the issuance of that series of preferred stock.

                                       184
<PAGE>   195

                             ARCH'S SPECIAL MEETING

     We are furnishing this joint proxy statement/prospectus to the holders of
Arch common stock, Class B common stock and Series C preferred stock in
connection with the solicitation of proxies by the Arch board of directors for
use at the special meeting of Arch stockholders to be held on [DAY], [DATE],
2000, and any adjournment or postponement of the meeting. We have included a
form of proxy for use at the special meeting with each copy of this joint proxy
statement/prospectus.

     This joint proxy statement/prospectus and the accompanying form of proxy
are first being furnished to the Arch stockholders on or about [DATE], 2000.
This joint proxy statement/prospectus is also being furnished to PageNet
stockholders as a proxy statement of PageNet and as a prospectus of Arch in
connection with the issuance by Arch of shares of Arch common stock as
contemplated by the merger agreement.

DATE, TIME AND PLACE

     The special meeting will be held on [DATE], 2000 at 10:00 a.m., local time,
at the offices of Hale and Dorr LLP, 60 State Street, Boston, MA 02109.

MATTERS TO BE CONSIDERED

     At the special meeting and any adjournment or postponement of the special
meeting, Arch stockholders will be asked:

     - to consider and vote upon a proposal to issue shares of Arch's common
       stock, $.01 par value per share, pursuant to the agreement and plan of
       merger, dated as of November 7, 1999, as subsequently amended, among
       Arch, Paging Network, Inc., and St. Louis Acquisition Corp., a wholly
       owned subsidiary of Arch;

     - to consider and vote upon a proposal to amend Arch's restated certificate
       of incorporation to: (1) increase the number of authorized shares of Arch
       common stock from 65,000,000 to 200,000,000 shares and (2) convert all of
       the shares of Series C convertible preferred stock into 2,104,142 shares
       of Arch common stock; and

     - to transact such other business as may properly come before the special
       meeting.

     In addition, the holders of Series C convertible preferred stock will be
asked to consider separately and vote as a class upon a proposal to convert all
outstanding shares of Series C preferred stock into 2,104,142 shares of Arch
common stock.

     The approval of each of the proposals, including the proposal to be
separately considered by holders of the Series C preferred stock, is conditioned
upon approval of the others. Accordingly, a vote against any of the proposals
will have the same effect as a vote against all.

VOTING AND REVOCATION OF PROXIES

     If you attend the special meeting, you may vote by ballot. The Arch board
of directors is soliciting proxies, however, to ensure that Arch stockholders
have the opportunity to vote on the proposals to be considered at the special
meeting if they are unable to attend. Accordingly, we request that you complete,
date and sign the accompanying proxy and promptly return it in the accompanying
postage-paid envelope or otherwise mail it to Arch. Brokers holding shares in
"street name" may vote the shares only if the beneficial stockholder provides
instructions on how to vote. Brokers will provide beneficial owners instructions
on how to direct the brokers to vote the shares. All properly executed proxies
that Arch receives prior to the vote at the special meeting that are not revoked
will be voted in accordance with the instructions indicated on the proxies. If
no direction is indicated, the proxies will be voted to approve each of the
proposals.

                                       185
<PAGE>   196

     The Arch board of directors does not currently intend to bring any other
business before the special meeting and, so far as the Arch board of directors
knows, no other matters are to be brought before the special meeting. If any
other matters are properly presented for consideration, including, among other
things, consideration of a motion to adjourn or postpone such meeting to another
time and/or place for the purposes of soliciting additional proxies or allowing
additional time for the satisfaction of conditions to the merger agreement, the
persons named in the enclosed form of proxy and acting thereunder generally will
have discretion to vote on such matters in accordance with their best judgment.

     Stockholders may revoke their proxies at any time prior to its use by

     - delivering to the secretary of Arch a signed notice of revocation or a
       later-dated, signed proxy; or

     - attending the special meeting and voting in person.

     Attendance at the special meeting does not in itself constitute the
revocation of a proxy.

VOTE REQUIRED

     At the close of business on [RECORD DATE], 2000, the record date, there
were 47,263,514 shares of Arch common stock outstanding and entitled to
47,263,514 votes, 3,968,150 shares of Class B common stock outstanding and
entitled to 39,681 votes and 250,000 shares of Series C preferred stock
outstanding and entitled to 1,720,100 votes.

     The holders of shares of Arch's Series C preferred stock will vote
separately as a class at the special meeting on the proposal to convert their
shares of Series C preferred stock into shares of Arch common stock. Under the
certificate of designation for the Series C preferred stock, the approval of
this proposal will require the affirmative vote of the holders of a majority of
the outstanding shares of the Series C preferred stock. Holders of shares of
Arch common stock, Class B common stock and Series C preferred stock will vote
together as a single class on each of the other proposals.

     The approval of the issuance of shares of Arch common stock pursuant to the
merger agreement will require the affirmative vote of the holders of a majority
of the shares present and entitled to vote. The approval of this proposal is
required by the rules of the NASD governing corporations with securities
approved for quotation on the Nasdaq National Market System. Under Delaware law,
the adoption of the amendments to the certificate of incorporation will require
the affirmative vote of the holders of a majority of all shares of Arch common
stock, Class B common stock and Series C preferred stock, whether present or not
at the special meeting.

     The special meeting may be adjourned, and additional proxies may be
solicited, if the vote necessary to approve a proposal has not been obtained.
Any adjournment of the special meeting will require the affirmative vote of the
holders of the shares represented, whether in person or by proxy, of the special
meeting (regardless of whether these shares constitute a quorum).

QUORUM; ABSTENTIONS AND BROKER NON-VOTES

     The required quorum for the transaction of business at the special meeting
is a majority of the outstanding shares of Arch common stock, Class B common
stock and Series C preferred stock (calculated on an as-converted basis,
assuming conversion of all Class B common stock and Series C preferred stock,
and voting together as a single class) entitled to vote at the special meeting.
Abstentions and broker non-votes will be counted for purposes of determining the
presence of a quorum. In determining whether the proposal to issue shares of
Arch's common stock pursuant to the merger agreement has received the requisite
number of affirmative votes for approval, abstentions and broker non-votes will
not be counted as votes in favor of the proposal, and also will not be counted
as shares voting on the proposal. Accordingly, abstentions and broker non-votes
will have no effect on the outcome of the proposal. Because approval of the
other proposals requires the affirmative vote of a majority of the shares
entitled to on each proposal, abstentions and broker non-votes will not be
counted as votes in favor of the proposals. Accordingly, abstentions and broker
non-votes will have the same effect as a vote against those

                                       186
<PAGE>   197

proposals. In addition, the failure of an Arch stockholder to return a proxy or
vote in person will have the effect of a vote against the proposals. Brokers
holding shares for a beneficial owner cannot vote on the actions proposed in the
joint proxy statement/prospectus without the beneficial owner's specific
instructions. Arch stockholders therefore are urged to return the enclosed proxy
card marked to indicate their vote.

SOLICITATION OF PROXIES AND EXPENSES

     All expenses of Arch's solicitation of proxies will be paid by Arch. The
cost of preparing and mailing this joint proxy statement/prospectus, will be
shared equally by Arch and PageNet. In addition to solicitation by mail, proxies
may be solicited by directors, officers and employees of Arch in person or by
telephone, facsimile, email or other means of communication. Any directors,
officers and employees soliciting proxies will not be additionally compensated,
but may be reimbursed for reasonable expenses incurred in connection with the
solicitation.

     Arch has retained [PROXY FIRM], to assist in the solicitation of proxies
from its stockholders. The fees to be paid to [PROXY FIRM] for its services are
expected to be $[PROXY FIRM FEES], plus reasonable expenses. Brokerage houses,
nominees, fiduciaries and other custodians will be requested to forward
soliciting materials to beneficial owners and will be reimbursed for their
reasonable expenses incurred in sending proxy materials to beneficial owners.

APPRAISAL RIGHTS

     Holders of Arch common stock, Class B common stock and Series C preferred
stock will not be entitled to any appraisal rights in connection with the
matters to be voted upon at the special meeting.

RECOMMENDATION OF THE ARCH BOARD OF DIRECTORS

     THE ARCH BOARD OF DIRECTORS HAS DETERMINED THAT EACH OF THE PROPOSALS IS
FAIR TO, AND IN THE BEST INTERESTS OF, ARCH AND ITS STOCKHOLDERS. ACCORDINGLY,
THE ARCH BOARD OF DIRECTORS HAS UNANIMOUSLY APPROVED THE MERGER AGREEMENT AND
THE TRANSACTIONS CONTEMPLATED BY THE MERGER AGREEMENT AND RECOMMENDS THAT YOU
VOTE FOR EACH OF THE PROPOSALS ON WHICH YOU ARE ENTITLED TO VOTE.

     THE MATTERS TO BE CONSIDERED AT THE SPECIAL MEETING ARE OF GREAT IMPORTANCE
TO THE ARCH STOCKHOLDERS. ACCORDINGLY, ARCH STOCKHOLDERS ARE URGED TO READ AND
CAREFULLY CONSIDER THE INFORMATION PRESENTED IN THIS JOINT PROXY
STATEMENT/PROSPECTUS, AND TO COMPLETE, DATE, SIGN AND PROMPTLY RETURN THE
ENCLOSED PROXY IN THE ENCLOSED POSTAGE-PAID ENVELOPE.

                                       187
<PAGE>   198

                           PAGENET'S SPECIAL MEETING

     We are furnishing this proxy statement/prospectus to the holders of PageNet
common stock in connection with the solicitation of proxies by the PageNet board
of directors for use at the special meeting of PageNet stockholders to be held
on [DAY], [DATE], 2000, and any adjournment or postponement of the meeting. We
have included a form of proxy for use at the special meeting with each copy of
this joint proxy statement/prospectus.

     This joint proxy statement/prospectus and the accompanying form of proxy
are first being furnished to the PageNet stockholders on or about [DATE], 2000.

DATE, TIME AND PLACE

     The special meeting will be held on [DATE], 2000 at 10:00 a.m., local time,
at [ADDRESS].

MATTERS TO BE CONSIDERED

     At the special meeting and any adjournment or postponement of the special
meeting, PageNet stockholders will be asked:

     - to consider and vote upon a proposal to adopt the merger agreement and
       approve the merger;

     - to consider and vote upon a proposal to amend PageNet's restated
       certificate of incorporation to increase the number of authorized shares
       of PageNet common stock from 250,000,000 to 750,000,000 shares;

     - to consider and vote upon a proposal to issue shares of PageNet's common
       stock in an amount sufficient to complete the PageNet exchange offer; and

     - to transact such other business as may properly come before the special
       meeting.

     The approval of each of the proposals is conditioned upon approval of the
others. Accordingly, a vote against any of the proposals will have the same
effect as a vote against all.

VOTING AND REVOCATION OF PROXIES

     If you attend the special meeting, you may vote by ballot. The PageNet
board of directors is soliciting proxies, however, to ensure that PageNet
stockholders have the opportunity to vote on the proposals to be considered at
the special meeting if they are unable to attend.

     Accordingly, we request that you complete, date and sign the accompanying
proxy and promptly return it in the accompanying postage-paid envelope or
otherwise mail it to PageNet. Brokers holding shares in "street name" may vote
the shares only if the beneficial stockholder provides instructions on how to
vote. Brokers will provide beneficial owners instructions on how to direct the
brokers to vote the shares. All properly executed proxies that PageNet receives
prior to the vote at the special meeting that are not revoked will be voted in
accordance with the instructions indicated on the proxies. If no direction is
indicated, the proxies will be voted to approve each of the proposals.

     The PageNet board of directors does not currently intend to bring any other
business before the special meeting and, so far as the PageNet board of
directors knows, no other matters are to be brought before the special meeting.
If any other matters are properly presented for consideration, including, among
other things, consideration of a motion to adjourn or postpone such meeting to
another time and/or place for the purposes of soliciting additional proxies or
allowing additional time for the satisfaction of conditions to the merger
agreement, the persons named in the enclosed form of proxy and acting thereunder
generally will have discretion to vote on such matters in accordance with their
best judgment.

     Stockholders may revoke their proxies at any time prior to its use by

     - delivering to the secretary of PageNet a signed notice of revocation or a
       later-dated, signed proxy; or

     - attending the special meeting and voting in person.

                                       188
<PAGE>   199

     Attendance at the special meeting does not in itself constitute the
revocation of a proxy.

VOTE REQUIRED

     At the close of business on [RECORD DATE], 2000, the record date, there
were [       ] shares of PageNet common stock outstanding and entitled to vote.

     Each share of PageNet common stock is entitled to one vote on the matters
presented.

     Under Delaware law, the adoption of the merger agreement and the adoption
of the amendment to the restated certificate of incorporation will require the
affirmative vote of the holders of a majority of all shares of PageNet common
stock outstanding and entitled to vote, whether present or not at the special
meeting.

     The approval of the issuance of shares of PageNet common stock in an amount
sufficient to complete the PageNet exchange offer will require the affirmative
vote of the holders of a majority of the shares present. The approval of this
proposal is required by the rules of the NASD governing corporations with
securities approved for quotation on the Nasdaq National Market System.

     The chairman of the board of directors or the president may adjourn the
special meeting, and additional proxies may be solicited, if the vote necessary
to approve a proposal has not been obtained.

QUORUM; ABSTENTIONS AND BROKER NON-VOTES

     The required quorum for the transaction of business at the special meeting
is a majority of the outstanding shares of PageNet common stock entitled to vote
at the special meeting. Abstentions and broker non-votes will be counted for
purposes of determining the presence of a quorum. In determining whether the
proposal to issue shares of PageNet's common stock pursuant to the merger
agreement has received the requisite number of affirmative votes for approval,
abstentions and broker non-votes will not be counted as votes in favor of the
proposal, and also will not be counted as shares voting on the proposals.
Accordingly, abstentions and broker non-votes will have the same effect as a
vote against those proposals. In addition, the failure of a PageNet stockholder
to return a proxy or vote in person will have the effect of a vote against the
proposals. Brokers holding shares for a beneficial owner cannot vote on the
actions proposed in the proxy statement/prospectus without the beneficial
owner's specific instructions. PageNet stockholders therefore are urged to
return the enclosed proxy card marked to indicate their vote.

SOLICITATION OF PROXIES AND EXPENSES

     All expenses of PageNet's solicitation of proxies will be paid by PageNet.
The cost of preparing and mailing this proxy statement/prospectus, will be
shared equally by Arch and PageNet. In addition to solicitation by mail, proxies
may be solicited by directors, officers and employees of PageNet in person or by
telephone, facsimile, e-mail or other means of communication. Any directors,
officers and employees soliciting proxies will not be additionally compensated,
but may be reimbursed for reasonable expenses incurred in connection with the
solicitation.

     PageNet has retained [PROXY FIRM], to assist in the solicitation of proxies
from its stockholders. The fees to be paid to [PROXY FIRM] for its services are
expected to be $[PROXY FIRM FEES], plus reasonable expenses. Brokerage houses,
nominees, fiduciaries and other custodians will be requested to forward
soliciting material to beneficial owners and will be reimbursed for their
reasonable expenses incurred in sending proxy materials to beneficial owners.

APPRAISAL RIGHTS

     Holders of PageNet common stock will not be entitled to any appraisal
rights in connection with the matters to be voted upon at the special meeting
except in the circumstances described under "Risk Factors -- PageNet may be
delisted from the Nasdaq National Market Systems and the Chicago Stock

                                       189
<PAGE>   200

Exchange prior to the completion of the merger, resulting in reduced trading
liquidity for the shares of its common stock".

RECOMMENDATION OF THE PAGENET BOARD OF DIRECTORS

     THE PAGENET BOARD OF DIRECTORS HAS DETERMINED THAT EACH OF THE PROPOSALS IS
FAIR TO, AND IN THE BEST INTERESTS OF, PAGENET AND ITS STOCKHOLDERS.
ACCORDINGLY, THE PAGENET BOARD OF DIRECTORS HAS UNANIMOUSLY APPROVED THE MERGER
AGREEMENT AND THE TRANSACTIONS CONTEMPLATED BY THE MERGER AGREEMENT AND
RECOMMENDS THAT YOU VOTE FOR EACH OF THE PROPOSALS ON WHICH YOU ARE ENTITLED TO
VOTE.

     THE MATTERS TO BE CONSIDERED AT THE SPECIAL MEETING ARE OF GREAT IMPORTANCE
TO THE PAGENET STOCKHOLDERS. ACCORDINGLY, PAGENET STOCKHOLDERS ARE URGED TO READ
AND CAREFULLY CONSIDER THE INFORMATION PRESENTED IN THIS PROXY
STATEMENT/PROSPECTUS, AND TO COMPLETE, DATE, SIGN AND PROMPTLY RETURN THE
ENCLOSED PROXY IN THE ENCLOSED POSTAGE-PAID ENVELOPE.

                                       190
<PAGE>   201

                             STOCKHOLDER PROPOSALS

     Arch expects to hold its annual meeting of stockholders on May 16, 2000.
Stockholder proposals for inclusion in the proxy materials for Arch's 2000
annual meeting of stockholders, including stockholder nominations for election
to Arch's board of directors, must be submitted to the secretary of Arch in
writing and received at the executive offices of Arch by February 25, 2000. Any
proposals must meet the requirements of the rules of the SEC relating to
stockholder proposals and must satisfy the notice requirements of procedures for
stockholder proposals set forth in the Arch bylaws.

     Arch's bylaws require that a stockholder's notice to the secretary include
a brief description of the stockholder's proposal, the reasons for the proposal,
the name and address, as they appear on Arch's stock ledger, of the stockholder
making the proposal, the number of Arch shares beneficially owned by the
stockholder and any material interest of the stockholder in the proposal.

     PageNet has not set a date for its 2000 annual meeting. Stockholder
proposals for inclusion in the proxy materials for PageNet's 2000 annual meeting
of stockholders must be submitted to the senior vice president, general counsel
and assistant secretary of PageNet in writing and received at the principal
executive offices of PageNet not more than 120 days and not less than 80 days
prior to the first anniversary date of the preceding year's annual meeting. If
the date of the meeting has changed more than 30 days from the preceding year,
then the stockholder's notice must be received not later than the 15th day
following the date on which notice of the meeting was mailed or was publicly
announced, whichever occurred first. The written notice must include a brief
description of the proposal to be brought before the meeting, the reasons for
the proposal, the name and address as they appear on PageNet's stock ledger of
the stockholder making the proposal, the number and class of shares beneficially
owned by the stockholder and any material interest of the stockholder in the
proposal.

     Stockholders of PageNet may nominate one or more persons for election as a
director at a meeting only if written notice of such stockholder's intent to
make such nomination or nominations has been given, either by personal delivery
or by United States mail, postage prepaid, to the senior vice president, general
counsel and assistant secretary of PageNet not more than 120 days and not less
than 80 days prior to the first anniversary of the preceding year's annual
meeting. If the date of the annual meeting has changed more than 30 days from
the preceding year, then the stockholder's notice must be received not later
than the 15th day following the date on which notice of the annual meeting was
mailed or was publicly announced, whichever occurred first. The written notice
must include the stockholder's name and address, the nominee's name and address,
a representation that the stockholder is a holder of PageNet stock entitled to
vote at the meeting and intends to appear in person or by proxy at the meeting,
a description of all arrangements between the stockholder and the nominee
pursuant to which the nomination is being made, any other information regarding
the nominee that would be required under the proxy rules of the SEC had the
person been nominated by PageNet's board of directors and the nominee's written
consent to be named as a nominee and to serve as a director if elected.

                                       191
<PAGE>   202

                                 LEGAL MATTERS

     The validity of the common stock offered by Arch in the merger will be
passed upon for Arch by Hale and Dorr LLP, 60 State Street, Boston,
Massachusetts.

                                    EXPERTS

     The financial statements of Arch included in this joint proxy
statement/prospectus have been audited by Arthur Andersen LLP, independent
public accountants, as indicated in their reports which are included in this
joint proxy statement/prospectus in reliance upon their authority as experts in
accounting and auditing in giving those reports.

     The consolidated financial statements of MobileMedia as of December 31,
1997 and 1998, and for each of the three years in the period ended December 31,
1998, included in this joint proxy statement/prospectus have been audited by
Ernst & Young LLP, independent auditors, as set forth in their report (which
contains an explanatory paragraph describing conditions that raise substantial
doubt about MobileMedia's ability to continue as a going concern as described in
Note 1 of MobileMedia's notes to the consolidated financial statements)
appearing elsewhere herein, and are included in reliance upon such report given
on the authority of such firm as experts in accounting and auditing.

     The consolidated financial statements of Paging Network, Inc. as of
December 31, 1997 and 1998, and for each of the three years in the period ended
December 31, 1998, included in this joint proxy statement/prospectus have been
audited by Ernst & Young LLP, independent auditors, as set forth in their report
thereon appearing elsewhere herein, and are included in reliance upon such
report given on the authority of such firm as experts in accounting and
auditing.

     The descriptions of the regulatory requirements under the Communications
Act and associated regulations set forth under "Risk Factors -- Government
regulation may burden operations" and under "Industry Overview -- Regulation" in
this proxy statement/prospectus, except for matters that are unique to PageNet,
have been included under the authority of Wilkinson, Barker, Knauer LLP, as
experts in telecommunications law. Stockholders of Arch should not rely on
Wilkinson, Barker, Knauer LLP with respect to any other matters.

                      WHERE YOU CAN FIND MORE INFORMATION

     Arch and PageNet file reports, proxy statements and other information with
the SEC as required by the Exchange Act.

     MobileMedia Communications, Inc. and MobileMedia Corporation were also
subject to the informational requirements of the Exchange Act but filed only
limited reports after the commencement of their bankruptcy proceedings in
January 1997. Financial statements included in MobileMedia Communications, Inc.
and MobileMedia Corporation's periodic reports from February 1997 through June
1998 were not prepared in accordance with generally accepted accounting
principles due to those companies' inability at the time of such filings to
determine the amount of an impairment loss related to long-lived assets pursuant
to Financial Accounting Standard No. 121. Those financial statements are
unaudited and have been revised periodically based on subsequent determinations
of changes in facts and circumstances impacting previously filed unaudited
financial statements. The audited financial statements of MobileMedia contained
in this joint proxy statement/prospectus reflect adjustments from the unaudited
statements, including an impairment adjustment of $792.5 million recorded as of
December 31, 1996.

     You can find, copy and inspect information filed by Arch, by PageNet and,
to the extent available, by MobileMedia Communications, Inc. and MobileMedia
Corporation with the SEC at the public reference facilities maintained by the
SEC at Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549 and at the
SEC's regional offices at 7 World Trade Center, Suite 1300, New York, New York
10048 and 500 West Madison Street, Suite 1400, Chicago, Illinois 60661. You can
obtain copies of information filed by Arch with the SEC at prescribed rates by
writing to the SEC's Public Reference Section, 450 Fifth
                                       192
<PAGE>   203

Street, N.W., Washington, D.C. 20549. You can call the SEC at 1-800-SEC-0330 for
further information about the public reference rooms. You can review Arch's,
PageNet's, MobileMedia Communications, Inc. and MobileMedia Corporation's
electronically filed reports, proxy and information statements on the SEC's
world wide web site at http://www.sec.gov. Arch's and PageNet's common stock
trades on the Nasdaq National Market under the symbols "APGR" and "PAGE",
respectively. Therefore, you can inspect reports, proxy statements and other
information concerning Arch and PageNet at the offices of the National
Association of Securities Dealers, Inc., Market Listing Section, 1735 K Street,
N.W., Washington, D.C. 20006. Arch maintains a world wide web site at
http://www.arch.com. PageNet maintains a world wide web site at
http://www.pagenet.com. Neither Arch's nor PageNet's web site is a part of this
joint proxy statement/prospectus.

     Arch has filed with the SEC a registration statement on Form S-4 under the
Securities Act to register the common stock offered by this joint proxy
statement/prospectus. The term "registration statement" includes all amendments,
exhibits, annexes and schedules. This joint proxy statement/prospectus does not
contain all the information you can find in the registration statement or the
exhibits and schedules to the registration statement. For further information
about Arch, PageNet, MobileMedia Communications, Inc., MobileMedia Corporation
and Arch's and PageNet's common stock, please refer to the registration
statement, including its exhibits and schedules. You may inspect and copy the
registration statement, including exhibits and schedules, as described above.
Statements contained in this proxy statement/ prospectus about the contents of
any contract or other document are not necessarily complete, and we refer you,
in each case, to the copy of such contract or other document filed as an exhibit
to the registration statement.

     YOU MAY REQUEST A COPY OF ARCH'S, PAGENET'S AND MOBILEMEDIA'S FILINGS WITH
THE SEC, AT NO COST, BY WRITING OR TELEPHONING ARCH AT THE FOLLOWING ADDRESS:

                        ARCH COMMUNICATIONS GROUP, INC.
                        1800 WEST PARK DRIVE, SUITE 250
                        WESTBOROUGH, MASSACHUSETTS 01581
                         ATTENTION: INVESTOR RELATIONS
                            TELEPHONE (508) 870-6700

                                       193
<PAGE>   204

INCORPORATION OF DOCUMENTS BY REFERENCE

     All documents and reports filed by Arch or PageNet pursuant to Section
13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this joint proxy
statement/prospectus are incorporated by reference in this joint proxy
statement/prospectus and will be deemed a part of this joint proxy
statement/prospectus from the dates of filing of such documents or reports.

     Statements contained in subsequently filed documents incorporated or deemed
to be incorporated by reference will modify and supersede statements in the
joint proxy statement/prospectus or in any previously filed documents to the
extent the new information differs from the old information. Any statements
modified or superseded will no longer constitute a part of this joint proxy
statement/prospectus in their original form.

                                       194
<PAGE>   205

                         INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
ARCH COMMUNICATIONS GROUP, INC. AND SUBSIDIARIES
Report of Independent Public Accountants....................   F-2
Consolidated Balance Sheets as of December 31, 1997 and
  1998......................................................   F-3
Consolidated Statements of Operations for Each of the Three
  Years in the Period Ended December 31, 1998...............   F-4
Consolidated Statements of Stockholders' Equity (Deficit)
  for Each of the Three Years in the Period Ended December
  31, 1998..................................................   F-5
Consolidated Statements of Cash Flows for Each of the Three
  Years in the Period Ended December 31, 1998...............   F-6
Notes to Consolidated Financial Statements..................   F-7
Interim Financial Statements (Unaudited):
  Consolidated Condensed Balance Sheets as of December 31,
     1998 and September 30, 1999............................  F-21
  Consolidated Condensed Statements of Operations for Three
     and Nine Month Periods Ended September 30, 1998 and
     1999...................................................  F-22
  Consolidated Condensed Statements of Cash Flows for the
     Nine Months Ended September 30, 1998 and 1999..........  F-23
  Notes to Consolidated Condensed Financial Statements......  F-24

PAGING NETWORK, INC. AND SUBSIDIARIES
Report of Independent Auditors..............................  F-30
Consolidated Balance Sheets as of December 31, 1997 and
  1998......................................................  F-31
Consolidated Statements of Operations for Each of the Three
  Years in the Period Ended December 31, 1998...............  F-32
Consolidated Statements of Cash Flows for Each of the Three
  Years in the Period Ended December 31, 1998...............  F-33
Consolidated Statements of Shareowners' Deficit for each of
  the Three Years in the Period Ended December 31, 1998.....  F-34
Notes to Consolidated Financial Statements..................  F-35
Interim Financial Statements (Unaudited):
  Consolidated Balance Sheets as of September 30, 1999 and
     December 31, 1998......................................  F-48
  Consolidated Statements of Operations for Three and Nine
     Month Periods Ended September 30, 1999 and 1998........  F-49
  Consolidated Statements of Cash Flows for the Nine Months
     Ended September 30, 1999 and 1998......................  F-50
  Notes to Consolidated Condensed Financial Statements......  F-51

MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES
Report of Independent Auditors..............................  F-58
Consolidated Balance Sheets as of December 31, 1997 and 1998
  and March 31, 1999 (unaudited)............................  F-59
Consolidated Statements of Operations for Each of the Three
  Years in the Period Ended December 31, 1998 and for the
  Three Months Ended March 31, 1998 and 1999 (unaudited)....  F-60
Consolidated Statement of Changes in Stockholders' Equity
  (Deficit) for Each of the Three Years in the Period Ended
  December 31, 1998 and for the Three Months Ended March 31,
  1999 (unaudited)..........................................  F-61
Consolidated Statements of Cash Flows for Each of the Three
  Years in the Period Ended December 31, 1998 and for the
  Three Months Ended March 31, 1998 and 1999 (unaudited)....  F-62
Notes to Consolidated Financial Statements..................  F-63
</TABLE>

                                       F-1
<PAGE>   206

                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To Arch Communications Group, Inc.:

     We have audited the accompanying consolidated balance sheets of Arch
Communications Group, Inc. (a Delaware corporation) (the "Company") and
subsidiaries as of December 31, 1997 and 1998, and the related consolidated
statements of operations, stockholders' equity (deficit) and cash flows for each
of the three years in the period ended December 31, 1998. These consolidated
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these consolidated financial
statements, based on our audits.

     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the consolidated financial position of
Arch Communications Group, Inc. and subsidiaries as of December 31, 1997 and
1998, and the results of their operations and their cash flows for each of the
three years in the period ended December 31, 1998, in conformity with generally
accepted accounting principles.

                                            ARTHUR ANDERSEN LLP

Boston, Massachusetts
February 24, 1999 (except with respect to the matters
discussed in Note 12, as to which the date is June 28, 1999)

                                       F-2
<PAGE>   207

                        ARCH COMMUNICATIONS GROUP, INC.

                          CONSOLIDATED BALANCE SHEETS
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              -----------------------
                                                                 1997         1998
                                                              ----------   ----------
<S>                                                           <C>          <C>
                                       ASSETS
Current assets:
     Cash and cash equivalents..............................  $    3,328   $    1,633
     Accounts receivable (less reserves of $5,744 and $6,583
      in 1997 and 1998, respectively).......................      30,147       30,753
     Inventories............................................      12,633       10,319
     Prepaid expenses and other.............................       4,917        8,007
                                                              ----------   ----------
          Total current assets..............................      51,025       50,712
                                                              ----------   ----------
Property and equipment, at cost:
     Land, buildings and improvements.......................      10,089       10,480
     Paging and computer equipment..........................     361,713      400,312
     Furniture, fixtures and vehicles.......................      16,233       17,381
                                                              ----------   ----------
                                                                 388,035      428,173
     Less accumulated depreciation and amortization.........     146,542      209,128
                                                              ----------   ----------
     Property and equipment, net............................     241,493      219,045
                                                              ----------   ----------
Intangible and other assets (less accumulated amortization
  of $260,932 and $372,122 in 1997 and 1998,
  respectively).............................................     728,202      634,528
                                                              ----------   ----------
                                                              $1,020,720   $  904,285
                                                              ==========   ==========

                   LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
     Current maturities of long-term debt...................  $   24,513   $    1,250
     Accounts payable.......................................      22,486       25,683
     Accrued restructuring charges..........................          --       11,909
     Accrued expenses.......................................      11,894       11,689
     Accrued interest.......................................      11,249       20,997
     Customer deposits......................................       6,150        4,528
     Deferred revenue.......................................       8,787       10,958
                                                              ----------   ----------
          Total current liabilities.........................      85,079       87,014
                                                              ----------   ----------
Long-term debt, less current maturities.....................     968,896    1,003,499
                                                              ----------   ----------
     Other long-term liabilities............................          --       27,235
                                                              ----------   ----------
Commitments and contingencies
Stockholders' equity (deficit):
     Preferred stock--$.01 par value, authorized 10,000,000
      shares; issued 250,000 shares (aggregate liquidation
      preference of $26,030 in 1999)........................          --            3
     Common stock--$.01 par value, authorized 75,000,000
      shares, issued and outstanding: 6,954,521 and
      7,071,861 shares in 1997 and 1998, respectively.......          70           71
     Additional paid-in capital.............................     351,349      378,218
     Accumulated deficit....................................    (384,674)    (591,755)
                                                              ----------   ----------
          Total stockholders' equity (deficit)..............     (33,255)    (213,463)
                                                              ----------   ----------
                                                              $1,020,720   $  904,285
                                                              ==========   ==========
</TABLE>

  The accompanying notes are an integral part of these consolidated financial
                                  statements.
                                       F-3
<PAGE>   208

                        ARCH COMMUNICATIONS GROUP, INC.

                     CONSOLIDATED STATEMENTS OF OPERATIONS
               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                               YEARS ENDED DECEMBER 31,
                                                          -----------------------------------
                                                            1996         1997         1998
                                                          ---------    ---------    ---------
<S>                                                       <C>          <C>          <C>
Service, rental and maintenance revenues................  $ 291,399    $ 351,944    $ 371,154
Product sales...........................................     39,971       44,897       42,481
                                                          ---------    ---------    ---------
          Total revenues................................    331,370      396,841      413,635
Cost of products sold...................................    (27,469)     (29,158)     (29,953)
                                                          ---------    ---------    ---------
                                                            303,901      367,683      383,682
                                                          ---------    ---------    ---------
Operating expenses:
     Service, rental and maintenance....................     64,957       79,836       80,782
     Selling............................................     46,962       51,474       49,132
     General and administrative.........................     86,181      106,041      112,181
     Depreciation and amortization......................    191,871      232,347      221,316
     Restructuring charge...............................         --           --       14,700
                                                          ---------    ---------    ---------
          Total operating expenses......................    389,971      469,698      478,111
                                                          ---------    ---------    ---------
Operating income (loss).................................    (86,070)    (102,015)     (94,429)
Interest expense........................................    (76,303)     (96,482)    (104,019)
Interest income.........................................      1,426          904        1,766
Other expense...........................................     (1,050)      (1,581)      (1,960)
Equity in loss of affiliate.............................     (1,968)      (3,872)      (5,689)
                                                          ---------    ---------    ---------
Income (loss) before income tax benefit, extraordinary
  item and accounting change............................   (163,965)    (203,046)    (204,331)
Benefit from income taxes...............................     51,207       21,172           --
                                                          ---------    ---------    ---------
Income (loss) before extraordinary item and accounting
  change................................................   (112,758)    (181,874)    (204,331)
Extraordinary charge from early extinguishment of
  debt..................................................     (1,904)          --       (1,720)
Cumulative effect of accounting change..................         --           --           --
                                                          ---------    ---------    ---------
Net income (loss).......................................   (114,662)    (181,874)    (206,051)
Accretion of redeemable preferred stock.................       (336)         (32)          --
Preferred stock dividend................................         --           --       (1,030)
                                                          ---------    ---------    ---------
Net income (loss) applicable to common stockholders.....  $(114,998)   $(181,906)   $(207,081)
                                                          =========    =========    =========
Basic/diluted income (loss) per common share before
  extraordinary item and accounting change..............  $  (16.59)   $  (26.31)   $  (29.34)
Extraordinary charge from early extinguishment of debt
  per basic/diluted common share........................      (0.27)          --        (0.24)
                                                          ---------    ---------    ---------
Basic/diluted net income (loss) per common share........  $  (16.86)   $  (26.31)   $  (29.58)
                                                          =========    =========    =========
Basic/diluted weighted average number of common shares
  outstanding...........................................  6,815,314    6,915,413    6,997,730
                                                          =========    =========    =========
</TABLE>

  The accompanying notes are an integral part of these consolidated financial
                                  statements.
                                       F-4
<PAGE>   209

                        ARCH COMMUNICATIONS GROUP, INC.

           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                                                  TOTAL
                                                                 ADDITIONAL                   STOCKHOLDERS'
                                          PREFERRED    COMMON      PAID-IN     ACCUMULATED        EQUITY
                                            STOCK       STOCK      CAPITAL       DEFICIT        (DEFICIT)
                                          ---------    ------    ----------    -----------    -------------
<S>                                       <C>          <C>       <C>           <C>            <C>
Balance, December 31, 1995..............     $--         $66      $334,956      $ (88,138)      $ 246,884
     Exercise of options to purchase
       56,436 shares of common stock....      --           1         1,470             --           1,471
     Issuance of 15,614 shares of common
       stock under Arch's Employee Stock
       Purchase Plan....................      --          --           373             --             373
     Issuance of 281,013 shares of
       common stock upon conversion of
       convertible subordinated
       debentures.......................      --           3        14,118             --          14,121
     Accretion of redeemable preferred
       stock............................      --          --          (336)            --            (336)
     Net loss...........................      --          --            --       (114,662)       (114,662)
                                             ---         ---      --------      ---------       ---------
Balance, December 31, 1996..............      --          70       350,581       (202,800)        147,851
     Issuance of 50,447 shares of common
       stock under Arch's Employee Stock
       Purchase Plan....................      --          --           800             --             800
     Accretion of redeemable preferred
       stock............................      --          --           (32)            --             (32)
     Net loss...........................      --          --            --       (181,874)       (181,874)
                                             ---         ---      --------      ---------       ---------
Balance, December 31, 1997..............      --          70       351,349       (384,674)        (33,255)
     Exercise of options to purchase
       31,344 shares of common stock....      --          --           294             --             294
     Issuance of 250,000 shares of
       preferred stock..................       3          --        24,997             --          25,000
     Issuance of 85,996 shares of common
       stock under Arch's Employee Stock
       Purchase Plan....................      --           1           548             --             549
     Preferred stock dividend...........      --          --         1,030         (1,030)             --
     Net loss...........................      --          --            --       (206,051)       (206,051)
                                             ---         ---      --------      ---------       ---------
Balance, December 31, 1998..............     $ 3         $71      $378,218      $(591,755)      $(213,463)
                                             ===         ===      ========      =========       =========
</TABLE>

  The accompanying notes are an integral part of these consolidated financial
                                  statements.
                                       F-5
<PAGE>   210

                        ARCH COMMUNICATIONS GROUP, INC.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                  YEARS ENDED DECEMBER 31,
                                                              ---------------------------------
                                                                1996        1997        1998
                                                              ---------   ---------   ---------
<S>                                                           <C>         <C>         <C>
Cash flows from operating activities:
     Net income (loss)......................................  $(114,662)  $(181,874)  $(206,051)
     Adjustments to reconcile net income (loss) to net cash
       provided by operating activities:
     Depreciation and amortization..........................    191,871     232,347     221,316
     Deferred income tax benefit............................    (51,207)    (21,172)         --
     Extraordinary charge from early extinguishment of
       debt.................................................      1,904          --       1,720
     Equity in loss of affiliate............................      1,968       3,872       5,689
     Accretion of discount on senior notes..................     24,273      33,259      37,115
     Gain on Tower Site Sale................................         --          --      (2,500)
     Accounts receivable loss provision.....................      8,198       7,181       8,545
     Changes in assets and liabilities, net of effect from
       acquisitions of paging companies:
          Accounts receivable...............................    (15,513)    (11,984)     (9,151)
          Inventories.......................................      1,845      (2,394)      2,314
          Prepaid expenses and other........................         89        (386)     (3,090)
          Accounts payable and accrued expenses.............    (12,520)      3,683      24,649
          Customer deposits and deferred revenue............      1,556       1,058         549
                                                              ---------   ---------   ---------
Net cash provided by operating activities...................     37,802      63,590      81,105
                                                              ---------   ---------   ---------
Cash flows from investing activities:
     Additions to property and equipment, net...............   (138,899)    (87,868)    (79,249)
     Additions to intangible and other assets...............    (26,307)    (14,901)    (33,935)
     Net proceeds from Tower Site Sale......................         --          --      30,316
     Acquisition of paging companies, net of cash
       acquired.............................................   (325,420)         --          --
                                                              ---------   ---------   ---------
Net cash used for investing activities......................   (490,626)   (102,769)    (82,868)
                                                              ---------   ---------   ---------
Cash flows from financing activities:
     Issuance of long-term debt.............................    676,000      91,000     463,239
     Repayment of long-term debt............................   (225,166)    (49,046)   (489,014)
     Repayment of redeemable preferred stock................         --      (3,744)         --
     Net proceeds from sale of preferred stock..............         --          --      25,000
     Net proceeds from sale of common stock.................      1,844         800         843
                                                              ---------   ---------   ---------
Net cash provided by financing activities...................    452,678      39,010          68
                                                              ---------   ---------   ---------
Net (decrease) increase in cash and cash equivalents........       (146)       (169)     (1,695)
Cash and cash equivalents, beginning of period..............      3,643       3,497       3,328
                                                              ---------   ---------   ---------
Cash and cash equivalents, end of period....................  $   3,497   $   3,328   $   1,633
                                                              =========   =========   =========
Supplemental disclosure:
     Interest paid..........................................  $  48,905   $  62,231   $  57,151
                                                              =========   =========   =========
     Issuance of common stock for convertible debentures....  $  14,121   $      --   $      --
                                                              =========   =========   =========
     Accretion of redeemable preferred stock................  $     336   $      32   $      --
                                                              =========   =========   =========
     Preferred stock dividend...............................  $      --   $      --   $   1,030
                                                              =========   =========   =========
     Liabilities assumed in acquisition of paging
       companies............................................  $  58,233   $      --   $      --
                                                              =========   =========   =========
</TABLE>

  The accompanying notes are an integral part of these consolidated financial
                                  statements.
                                       F-6
<PAGE>   211

                        ARCH COMMUNICATIONS GROUP, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES

     Organization--Arch Communications Group, Inc. ("Arch" or the "Company") is
a leading provider of wireless messaging services, primarily paging services,
and is the third largest paging company in the United States (based on units in
service).

     Principles of Consolidation--The accompanying consolidated financial
statements include the accounts of the Company and its wholly-owned
subsidiaries. All significant intercompany accounts and transactions have been
eliminated in consolidation.

     Revenue Recognition--Arch recognizes revenue under rental and service
agreements with customers as the related services are performed. Maintenance
revenues and related costs are recognized ratably over the respective terms of
the agreements. Sales of equipment are recognized upon delivery. Commissions are
recognized as an expense when incurred.

     Use of Estimates--The preparation of financial statements in conformity
with generally accepted accounting principles requires management to make
estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the financial statements and the reported amounts of revenues and expenses
during the reporting period. Actual results could differ from those estimates.

     Cash Equivalents--Cash equivalents include short-term, interest-bearing
instruments purchased with remaining maturities of three months or less. The
carrying amount approximates fair value due to the relatively short period to
maturity of these instruments.

     Inventories--Inventories consist of new pagers which are held primarily for
resale. Inventories are stated at the lower of cost or market, with cost
determined on a first-in, first-out basis.

     Property and Equipment--Pagers sold or otherwise retired are removed from
the accounts at their net book value using the first-in, first-out method.
Property and equipment is stated at cost and is depreciated using the
straight-line method over the following estimated useful lives:

<TABLE>
<CAPTION>
                 ASSET CLASSIFICATION                    ESTIMATED USEFUL LIFE
                 --------------------                    ---------------------
<S>                                                      <C>
Buildings and improvements.............................        20 Years
Leasehold improvements.................................       Lease Term
Pagers.................................................         3 Years
Paging and computer equipment..........................        5-8 Years
Furniture and fixtures.................................        5-8 Years
Vehicles...............................................         3 Years
</TABLE>

     Depreciation and amortization expense related to property and equipment
totaled $87.5 million, $108.0 million and $101.1 million for the years ended
December 31, 1996, 1997 and 1998, respectively.

                                       F-7
<PAGE>   212
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     Intangible and Other Assets--Intangible and other assets, net of
accumulated amortization, are composed of the following (in thousands):

<TABLE>
<CAPTION>
                                                          DECEMBER 31,
                                                       -------------------
                                                         1997       1998
                                                       --------   --------
<S>                                                    <C>        <C>
Goodwill.............................................  $312,017   $271,808
Purchased FCC licenses...............................   293,922    256,519
Purchased subscriber lists...........................    87,281     56,825
Deferred financing costs.............................     8,752     22,072
Investment in Benbow PCS Ventures, Inc...............     6,189     11,347
Investment in CONXUS Communications, Inc.............     6,500      6,500
Non-competition agreements...........................     2,783      1,790
Other................................................    10,758      7,667
                                                       --------   --------
                                                       $728,202   $634,528
                                                       ========   ========
</TABLE>

     Amortization expense related to intangible and other assets totaled $104.4
million, $124.3 million and $120.2 million for the years ended December 31,
1996, 1997 and 1998, respectively.

     Subscriber lists, Federal Communications Commission ("FCC") licenses and
goodwill are amortized over their estimated useful lives, ranging from five to
ten years using the straight-line method. Non-competition agreements are
amortized over the terms of the agreements using the straight-line method. Other
assets consist of contract rights, organizational and FCC application and
development costs which are amortized using the straight-line method over their
estimated useful lives not exceeding ten years. Development and start up costs
include nonrecurring, direct costs incurred in the development and expansion of
paging systems, and are amortized over a two-year period. In April 1998, the
Accounting Standards Executive Committee of the Financial Accounting Standards
Board issued Statement of Position 98-5 ("SOP 98-5") "Reporting on the Costs of
Start-Up Activities". SOP 98-5 requires costs of start-up activities and
organization costs to be expensed as incurred. Arch adopted SOP 98-5 effective
January 1, 1999. Initial application of SOP 98-5 will be reported as the
cumulative effect of a change in accounting principle.

     Deferred financing costs incurred in connection with Arch's credit
agreements (see Note 3) are being amortized over periods not to exceed the terms
of the related agreements. As credit agreements are amended and restated,
unamortized deferred financing costs are written off as an extraordinary charge.
During 1996 and 1998, charges of $1.9 million and $1.7 million, respectively,
were recognized in connection with the closing of new credit facilities.

     In connection with Arch's May 1996 acquisition of Westlink Holdings, Inc.
("Westlink") (see Note 2), Arch acquired Westlink's 49.9% share of the capital
stock of Benbow PCS Ventures, Inc. ("Benbow"). Benbow has exclusive rights to a
50kHz outbound/12.5kHz inbound narrowband personal communications license in
each of the central and western regions of the United States. Arch is obligated,
to the extent such funds are not available to Benbow from other sources, and
subject to the approval of Arch's designee on Benbow's Board of Directors, to
advance Benbow sufficient funds to service debt obligations incurred by Benbow
in connection with its acquisition of its narrowband PCS licenses and to finance
the build out of a regional narrowband PCS system. Arch's investment in Benbow
is accounted for under the equity method whereby Arch's share of Benbow's
losses, since the acquisition date of Westlink, are recognized in Arch's
accompanying consolidated statements of operations under the caption equity in
loss of affiliate.

     On November 8, 1994, CONXUS Communications, Inc. ("CONXUS"), formerly PCS
Development Corporation, was successful in acquiring the rights to a 2-way
paging license in five designated regions in

                                       F-8
<PAGE>   213
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

the United States in the FCC narrowband wireless spectrum auction. As of
December 31, 1998, Arch's investment in CONXUS totaled $6.5 million and is
accounted for under the cost method.

     In accordance with Statement of Financial Accounting Standards ("SFAS") No.
121 "Accounting for the Impairment of Long-Lived Assets and Long-Lived Assets To
Be Disposed Of" Arch evaluates the recoverability of its carrying value of the
Company's long-lived assets and certain intangible assets based on estimated
undiscounted cash flows to be generated from each of such assets as compared to
the original estimates used in measuring the assets. To the extent impairment is
identified, Arch reduces the carrying value of such impaired assets. To date,
Arch has not had any such impairments.

     Fair Value of Financial Instruments--Arch's financial instruments, as
defined under SFAS No. 107 "Disclosures about Fair Value of Financial
Instruments", include its cash, its debt financing and interest rate protection
agreements. The fair value of cash is equal to the carrying value at December
31, 1997 and 1998.

     As discussed in Note 3, Arch's debt financing primarily consists of (1)
senior bank debt, (2) fixed rate senior notes and (3) convertible subordinated
debentures. Arch considers the fair value of senior bank debt to be equal to the
carrying value since the related facilities bear a current market rate of
interest. Arch's fixed rate senior notes are traded publicly. The following
table depicts the fair value of the fixed rate senior notes and the convertible
subordinated debentures based on the current market quote as of December 31,
1997 and 1998 (in thousands):

<TABLE>
<CAPTION>
                                      DECEMBER 31, 1997       DECEMBER 31, 1998
                                    ---------------------   ---------------------
                                    CARRYING                CARRYING
           DESCRIPTION               VALUE     FAIR VALUE    VALUE     FAIR VALUE
           -----------              --------   ----------   --------   ----------
<S>                                 <C>        <C>          <C>        <C>
10 7/8% Senior Discount Notes due
2008..............................  $332,532    $288,418    $369,506    $221,704
9 1/2% Senior Notes due 2004......   125,000     122,488     125,000     112,500
14% Senior Notes due 2004.........   100,000     112,540     100,000     103,000
12 3/4% Senior Notes due 2007.....        --          --     127,604     127,604
6 3/4% Convertible Subordinated
  Debentures due 2003.............    13,364       7,968      13,364       6,682
</TABLE>

     Arch had off-balance-sheet interest rate protection agreements consisting
of interest rate swaps and interest rate caps with notional amounts of $140.0
million and $80.0 million, respectively, at December 31, 1997 and $265.0 million
and $40.0 million, respectively, at December 31, 1998. The fair values of the
interest rate swaps and interest rate caps were $47,000 and $9,000,
respectively, at December 31, 1997. The cost to terminate the outstanding
interest rate swaps and interest rate caps at December 31, 1998 would have been
$6.4 million. See Note 3.

     Basic/Diluted Net Income (Loss) Per Common Share -- In February 1997, the
Financial Accounting Standards Board issued SFAS No. 128 "Earnings Per Share".
The Company adopted this standard in 1997. The adoption of this standard did not
have an effect on the Company's financial position, results of operations or
income (loss) per share. Basic net income (loss) per common share is based on
the weighted average number of common shares outstanding. Shares of stock
issuable pursuant to stock options and upon conversion of the subordinated
debentures (see Note 3) or the Series C Preferred Stock (see Note 4) have not
been considered, as their effect would be anti-dilutive and thus diluted net
income (loss) per common share is the same as basic net income (loss) per common
share.

     Reclassifications--Certain amounts of prior periods were reclassified to
conform with the 1998 presentation.

                                       F-9
<PAGE>   214
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

2.  ACQUISITIONS

     In May 1996, Arch completed its acquisition of all the outstanding capital
stock of Westlink for $325.4 million in cash, including direct transaction
costs. The purchase price was allocated based on the fair values of assets
acquired and liabilities assumed (including deferred income taxes arising in
purchase accounting), which amounted to $383.6 million and $58.2 million,
respectively.

     This acquisition has been accounted for as a purchase, and the results of
its operations have been included in the consolidated financial statements from
the date of the acquisition. Goodwill resulting from the acquisition is being
amortized over a ten-year period using the straight-line method.

     The following unaudited pro forma summary presents the consolidated results
of operations as if the acquisition had occurred at the beginning of the period
presented, after giving effect to certain adjustments, including depreciation
and amortization of acquired assets and interest expense on acquisition debt.
These pro forma results have been prepared for comparative purposes only and do
not purport to be indicative of what would have occurred had the acquisition
been made at the beginning of the period presented, or of results that may occur
in the future.

<TABLE>
<CAPTION>
                                                                YEAR ENDED
                                                            DECEMBER 31, 1996
                                                            -----------------
                                                       (UNAUDITED AND IN THOUSANDS
                                                      EXCEPT FOR PER SHARE AMOUNTS)
<S>                                                   <C>
Revenues............................................             $358,900
Income (loss) before extraordinary item.............             (128,444)
Net income (loss)...................................             (130,348)
Basic/diluted net income (loss) per common share....                (6.39)
</TABLE>

3.  LONG-TERM DEBT

     Long-term debt consisted of the following (in thousands):

<TABLE>
<CAPTION>
                                                             DECEMBER 31,
                                                         ---------------------
                                                           1997        1998
                                                         --------   ----------
<S>                                                      <C>        <C>
Senior Bank Debt.......................................  $422,500   $  267,000
10 7/8% Senior Discount Notes due 2008.................   332,532      369,506
9 1/2% Senior Notes due 2004...........................   125,000      125,000
14% Senior Notes due 2004..............................   100,000      100,000
12 3/4% Senior Notes due 2007..........................        --      127,604
Convertible Subordinated Debentures....................    13,364       13,364
Other..................................................        13        2,275
                                                         --------   ----------
                                                          993,409    1,004,749
Less -- Current maturities.............................    24,513        1,250
                                                         --------   ----------
Long-term debt.........................................  $968,896   $1,003,499
                                                         ========   ==========
</TABLE>

     Senior Bank Debt -- The Company, through its operating subsidiary, Arch
Paging, Inc. ("API") entered into senior secured revolving credit and term loan
facilities in the aggregate amount of $400.0 million (collectively, the "API
Credit Facility") consisting of (i) a $175.0 million reducing revolving credit
facility (the "Tranche A Facility"), (ii) a $100.0 million 364-day revolving
credit facility under which the principal amount outstanding on June 27, 1999
will convert to a term loan (the "Tranche B Facility") and (iii) a $125.0
million term loan (the "Tranche C Facility").

                                      F-10
<PAGE>   215
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     The Tranche A Facility will be subject to scheduled quarterly reductions
commencing on September 30, 2000 and will mature on June 30, 2005. The term loan
portion of the Tranche B Facility will be amortized in quarterly installments
commencing September 30, 2000, with an ultimate maturity date of June 30, 2005.
The Tranche C Facility will be amortized in annual installments commencing
December 31, 1999, with an ultimate maturity date of June 30, 2006.

     API's obligations under the API Credit Facility are secured by its pledge
of its interests in Arch LLC and Arch Connecticut Valley, Inc. The API Credit
Facility is guaranteed by Arch, Arch Communications, Inc. ("ACI") and Arch LLC
and Arch Connecticut Valley, Inc. Arch's guarantee is secured by a pledge of
Arch's stock and notes in ACI, and the guarantees of Arch LLC and Arch
Connecticut Valley, Inc. are secured by a security interest in those assets that
were pledged under ACE's former credit facility.

     Borrowings under the API Credit Facility bear interest based on a reference
rate equal to either the Bank's Alternate Base Rate or LIBOR, in each case plus
a margin based on ACI's or API's ratio of total debt to annualized Adjusted
EBITDA.

     The API Credit Facility requires payment of fees on the daily average
amount available to be borrowed under the Tranche A Facility and the Tranche B
Facility, which fees vary depending on ACI's or API's ratio of total debt to
annualized Adjusted EBITDA.

     The API Credit Facility requires that at least 50% of total ACI debt,
including outstanding borrowings under the API Credit Facility, be subject to a
fixed interest rate or interest rate protection agreements. Entering into
interest rate cap and swap agreements involves both the credit risk of dealing
with counterparties and their ability to meet the terms of the contracts and
interest rate risk. In the event of nonperformance by the counterparty to these
interest rate protection agreements, API would be subject to the prevailing
interest rates specified in the API Credit Facility.

     Under the interest rate swap agreements, the Company will pay the
difference between LIBOR and the fixed swap rate if the swap rate exceeds LIBOR,
and the Company will receive the difference between LIBOR and the fixed swap
rate if LIBOR exceeds the swap rate. Settlement occurs on the quarterly reset
dates specified by the terms of the contracts. The notional principal amount of
the interest rate swaps outstanding was $65.0 million at December 31, 1998. The
weighted average fixed payment rate was 5.93%, while the weighted average rate
of variable interest payments under the API Credit Facility was 5.30% at
December 31, 1998. At December 31, 1997 and 1998, the Company had a net
receivable of $18,000 and a net payable of $47,000, respectively, on the
interest rate swaps.

     The interest rate cap agreements will pay the Company the difference
between LIBOR and the cap level if LIBOR exceeds the cap levels at any of the
quarterly reset dates. If LIBOR remains below the cap level, no payment is made
to the Company. The total notional amount of the interest rate cap agreements
was $40.0 million with cap levels between 7.5% and 8% at December 31, 1998. The
transaction fees for these instruments are being amortized over the terms of the
agreements.

     The API Credit Facility contains restrictions that limit, among other
things: additional indebtedness and encumbrances on assets; cash dividends and
other distributions; mergers and sales of assets; the repurchase or redemption
of capital stock; investments; acquisitions that exceed certain dollar
limitations without the lenders' prior approval; and prepayment of indebtedness
other than indebtedness under the API Credit Facility. In addition, the API
Credit Facility requires API and its subsidiaries to meet certain financial
covenants, including covenants with respect to ratios of EBITDA to fixed
charges, EBITDA to debt service, EBITDA to interest service and total
indebtedness to EBITDA. As of December 31, 1998, API and its operating
subsidiaries were in compliance with the covenants of the API Credit Facility.

                                      F-11
<PAGE>   216
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     As of December 31, 1998, $267.0 million was outstanding and $93.5 million
was available under the API Credit Facility. At December 31, 1998, such advances
bore interest at an average annual rate of 8.45%.

     On November 16, 1998, the lenders to API approved an increase in API's
existing credit facility from $400.0 million to $600.0 million, subject to
completing the MobileMedia Merger and certain other conditions. The increase of
$200.0 million (the "API Credit Facility Increase") was to fund a portion of the
cash necessary for Arch to complete the MobileMedia Merger. The API Credit
Facility Increase was to be provided by four of API's existing lenders, provided
the MobileMedia Transactions were completed prior to March 31, 1999. The four
API lenders that were to fund the API Credit Facility Increase have indicated
their willingness to seek approval to extend $135.0 million of the API Credit
Facility Increase through June 30, 1999, subject to formal approval, definitive
documentation and negotiation of certain terms.

     Senior Notes--On March 12, 1996, Arch completed a public offering of
10 7/8% Senior Discount Notes due 2008 (the "Senior Discount Notes") in the
aggregate principal amount at maturity of $467.4 million ($275.0 million initial
accreted value). Interest does not accrue on the Senior Discount Notes prior to
March 15, 2001. Commencing September 15, 2001, interest on the Senior Discount
Notes is payable semi-annually at an annual rate of 10 7/8%. The $266.1 million
net proceeds from the issuance of the Senior Discount Notes, after deducting
underwriting discounts and commissions and offering expenses, were used
principally to fund a portion of the purchase price of Arch's acquisition of
Westlink (see Note 2).

     Interest on ACI's 14% Senior Notes due 2004 (the "ACI 14% Notes") and ACI's
9 1/2% Senior Notes due 2004 (the "ACI 9 1/2% Notes") (collectively, the "Senior
Notes") is payable semiannually. The Senior Discount Notes and Senior Notes
contain certain restrictive and financial covenants, which, among other things,
limit the ability of Arch or ACI to: incur additional indebtedness; pay
dividends; grant liens on its assets; sell assets; enter into transactions with
related parties; merge, consolidate or transfer substantially all of its assets;
redeem capital stock or subordinated debt; and make certain investments.

     Arch has entered into interest rate swap agreements in connection with the
ACI 14% Notes. Under the interest rate swap agreements, the Company has
effectively reduced the interest rate on the ACI 14% Notes from 14% to the fixed
swap rate of 9.45%. In the event of nonperformance by the counterparty to these
interest rate protection agreements, the Company would be subject to the 14%
interest rate specified on the notes. As of December 31, 1998, the Company had
received $2,275,000 in excess of the amounts paid under the swap agreements,
which is included in long-term debt in the accompanying balance sheet. At
December 31, 1998, the Company had a net receivable of $733,500 on these
interest rate swaps.

     On June 29, 1998, ACI issued and sold $130.0 million principal amount of
12 3/4% Senior Notes due 2007 (the "ACI 12 3/4% Notes") for net proceeds of
$122.6 million (after deducting the discount to the initial purchasers and
estimated offering expenses payable by ACI). The ACI 12 3/4% Notes were sold at
an initial price to investors of 98.049%. The ACI 12 3/4% Notes mature on July
1, 2007 and bear interest at a rate of 12 3/4% per annum, payable semi-annually
in arrears on January 1 and July 1 of each year, commencing January 1, 1999.

     The indenture under which the ACI 12 3/4% Notes were issued ("the
Indenture") contains certain covenants that, among other things, limit the
ability of ACI to incur additional indebtedness, issue preferred stock, pay
dividends or make other distributions, repurchase Capital Stock (as defined in
the Indenture), repay subordinated indebtedness or make other Restricted
Payments (as defined in the Indenture), create certain liens, enter into certain
transactions with affiliates, sell assets, issue or sell Capital Stock of ACI's
Restricted Subsidiaries (as defined in the Indenture) or enter into certain
mergers and consolidations.

                                      F-12
<PAGE>   217
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     Convertible Subordinated Debentures--On March 6, 1996, the holders of $14.1
million principal amount of Arch's 6 3/4% Convertible Subordinated Debentures
due 2003 ("Arch Convertible Debentures") elected to convert their Arch
Convertible Debentures into Arch common stock at a conversion price of $50.25
per share and received approximately 281,000 shares of Arch common stock
together with a $1.6 million cash premium.

     Interest on the remaining outstanding Arch Convertible Debentures is
payable semiannually on June 1 and December 1. The Arch Convertible Debentures
are unsecured and are subordinated to all existing indebtedness of Arch.

     The Arch Convertible Debentures are redeemable, at the option of Arch, in
whole or in part, at certain prices declining annually to 100% of the principal
amount at maturity plus accrued interest. The Arch Convertible Debentures also
are subject to redemption at the option of the holders, at a price of 100% of
the principal amount plus accrued interest, upon the occurrence of certain
events.

     The Arch Convertible Debentures are convertible at their principal amount
into shares of Arch's common stock at any time prior to redemption or maturity
at an initial conversion price of $50.25 per share, subject to adjustment.

     Maturities of Debt--Scheduled long-term debt maturities at December 31,
1998, are as follows (in thousands):

<TABLE>
<CAPTION>
                        YEAR ENDING DECEMBER 31,
                        ------------------------
<S>                                                           <C>
1999........................................................  $    1,250
2000........................................................      17,725
2001........................................................      29,650
2002........................................................      29,650
2003........................................................      43,014
Thereafter..................................................     883,460
                                                              ----------
                                                              $1,004,749
                                                              ==========
</TABLE>

4.  REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY

     Redeemable Preferred Stock--In connection with the its merger (the "USAM
Merger") with USA Mobile Communications Holdings, Inc. ("USA Mobile"), Arch
assumed the obligations associated with 22,530 outstanding shares of Series A
Redeemable Preferred Stock issued by USA Mobile. The preferred stock is recorded
at its accreted redemption value, based on 10% annual accretion through the
redemption date. On January 30, 1997, all outstanding preferred stock was
redeemed for $3.7 million in cash.

     Redeemable Series C Cumulative Convertible Preferred Stock--On June 29,
1998, two partnerships managed by Sandler Capital Management Company, Inc., an
investment management firm ("Sandler"), together with certain other private
investors, made an equity investment in Arch of $25.0 million in the form of
Series C Convertible Preferred Stock of Arch ("Series C Preferred Stock"). The
Series C Preferred Stock: (i) is convertible into Common Stock of Arch at an
initial conversion price of $5.50 per share, subject to certain adjustments;
(ii) bears dividends at an annual rate of 8.0%, (A) payable quarterly in cash
or, at Arch's option, through the issuance of shares of Arch's Common Stock
valued at 95% of the then prevailing market price or (B) if not paid quarterly,
accumulating and payable upon redemption or conversion of the Series C Preferred
Stock or liquidation of Arch; (iii) permits the holders after seven years to
require Arch, at Arch's option, to redeem the Series C Preferred Stock for cash
or convert such shares into Arch's Common Stock valued at 95% of the then
prevailing market price of Arch's Common Stock; (iv) is subject to redemption
for cash or conversion into Arch's Common Stock at Arch's option in

                                      F-13
<PAGE>   218
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

certain circumstances; (v) in the event of a "Change of Control" as defined in
the indenture governing Arch's 10 7/8% Senior Discount Notes due 2008 (the
"Senior Discount Notes Indenture"), requires Arch, at its option, to redeem the
Series C Preferred Stock for cash or convert such shares into Arch's Common
Stock valued at 95% of the then prevailing market price of Arch's Common Stock,
with such cash redemption or conversion being at a price equal to 105% of the
sum of the original purchase price plus accumulated dividends; (vi) limits
certain mergers or asset sales by Arch; (vii) so long as at least 50% of the
Series C Preferred Stock remains outstanding, limits the incurrence of
indebtedness and "restricted payments" in the same manner as contained in the
Senior Discount Notes Indenture; and (viii) has certain voting and preemptive
rights. Upon an event of redemption or conversion, Arch currently intends to
convert such Series C Preferred Stock into shares of Arch Common Stock.

     Stock Options--Arch has a 1989 Stock Option Plan (the "1989 Plan") and a
1997 Stock Option Plan (the "1997 Plan"), which provide for the grant of
incentive and nonqualified stock options to key employees, directors and
consultants to purchase Arch's common stock. Incentive stock options are granted
at exercise prices not less than the fair market value on the date of grant.
Options generally vest over a five-year period from the date of grant with the
first such vesting (20% of granted options) occurring one year from the date of
grant and continuing ratably at 5% on a quarterly basis thereafter. However, in
certain circumstances, options may be immediately exercised in full. Options
generally have a duration of 10 years. The 1989 Plan provides for the granting
of options to purchase a total of 376,315 shares of common stock. All
outstanding options on September 7, 1995, under the 1989 Plan, became fully
exercisable and vested as a result of the USAM Merger. The 1997 Plan provides
for the granting of options to purchase a total of 2,000,000 shares of common
stock.

     Effective October 23, 1996, the Compensation Committee of the Board of
Directors of Arch authorized the grant of new options to each employee who had
an outstanding option at a price greater than $37.50 (the fair market value of
Arch's common stock on October 23, 1996). The new option would be for the total
number of shares (both vested and unvested) subject to each employee's
outstanding stock option agreement(s). As a result of this action 141,402
options were terminated and regranted at a price of $37.50. The Company treated
this as a cancellation and reissuance under APB opinion No. 25, "Accounting for
Stock Issued to Employees".

     As a result of the USAM Merger, Arch assumed a stock option plan originally
adopted by USA Mobile in 1994 and amended and restated on January 26, 1995 (the
"1994 Plan"), which provides for the grant of up to 200,500 options to purchase
Arch's common stock. Under the 1994 Plan, incentive stock options may be granted
to employees and nonqualified stock options may be granted to employees,
directors and consultants. Incentive stock options are granted at exercise
prices not less than the fair market value on the date of grant. Option duration
and vesting provisions are similar to the 1989 Plan. All outstanding options
under the 1994 Plan became fully exercisable and vested as a result of the USAM
Merger.

     In January 1995, Arch adopted a 1995 Outside Directors' Stock Option Plan
(the "1995 Directors' Plan"), which terminated upon completion of the USAM
Merger. Prior to termination of the 1995 Directors' Plan, 5,000 options were
granted at an exercise price of $55.50 per share. Options have a duration of ten
years and vest over a five-year period from the date of grant with the first
such vesting (20% of granted options) occurring one year from the date of grant
and continuing ratably at 5% on a quarterly basis thereafter.

     As a result of the USAM Merger, Arch assumed from USA Mobile the
Non-Employee Directors' Stock Option Plan (the "Outside Directors Plan"), which
provides for the grant of up to 26,733 options to purchase Arch's common stock
to non-employee directors of Arch. Outside directors receive a grant of 1,000
options annually under the Outside Directors Plan, and newly elected or
appointed outside directors receive options to purchase 1,000 shares of common
stock as of the date of their initial election or

                                      F-14
<PAGE>   219
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

appointment. Options are granted at fair market value of Arch's common stock on
the date of grant. Options have a duration of ten years and vest over a
three-year period from the date of grant with the first such vesting (25% of
granted options) occurring on the date of grant and future vesting of 25% of
granted options occurring on each of the first three anniversaries of the date
of grant.

     On December 16, 1997, the Compensation Committee of the Board of Directors
of Arch authorized the Company to offer an election to its employees who had
outstanding options at a price greater than $15.19 to cancel such options and
accept new options at a lower price. In January 1998, as a result of this
election by certain of its employees, the Company canceled 361,072 options with
exercise prices ranging from $17.82 to $61.88 and granted the same number of new
options with an exercise price of $15.19 per share, the fair market value of the
stock on December 16, 1997.

     On December 29, 1997, Arch adopted a Deferred Compensation Plan for
Nonemployee Directors. Under this plan, outside directors may elect to defer,
for a specified period of time, receipt of some or all of the annual and meeting
fees which would otherwise be payable for service as a director. A portion of
the deferred compensation may be converted into phantom stock units, at the
election of the director. The number of phantom stock units granted equals the
amount of compensation to be deferred as phantom stock divided by the fair value
of Arch's common stock on the date the compensation would have otherwise been
paid. At the end of the deferral period, the phantom stock units will be
converted to cash based on the fair market value of the Company's common stock
on the date of distribution. Deferred compensation is expensed when earned.
Changes in the value of the phantom stock units are recorded as income/expense
based on the fair market value of the Company's common stock.

     The following table summarizes the activity under Arch's stock option plans
for the periods presented:

<TABLE>
<CAPTION>
                                                                       WEIGHTED
                                                                       AVERAGE
                                                          NUMBER OF    EXERCISE
                                                           OPTIONS      PRICE
                                                          ---------    --------
<S>                                                       <C>          <C>
Options Outstanding at December 31, 1995................   335,250      $39.06
     Granted............................................   231,738       46.37
     Exercised..........................................   (56,436)      26.07
     Terminated.........................................  (161,487)      64.79
                                                          --------      ------
Options Outstanding at December 31, 1996................   349,065       34.11
     Granted............................................   166,785       20.03
     Exercised..........................................        --          --
     Terminated.........................................   (62,207)      31.97
                                                          --------      ------
Options Outstanding at December 31, 1997................   453,643       29.22
     Granted............................................   656,096       14.27
     Exercised..........................................   (31,344)       9.38
     Terminated.........................................  (430,127)      28.52
                                                          --------      ------
Options Outstanding at December 31, 1998................   648,268      $15.51
                                                          ========      ======
Options Exercisable at December 31, 1998................   111,249      $20.77
                                                          ========      ======
</TABLE>

                                      F-15
<PAGE>   220
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     The following table summarizes the options outstanding and options
exercisable by price range at December 31, 1998:

<TABLE>
<CAPTION>
                                               WEIGHTED
                                                AVERAGE     WEIGHTED                 WEIGHTED
                                               REMAINING    AVERAGE                  AVERAGE
            RANGE OF EXERCISE     OPTIONS     CONTRACTUAL   EXERCISE     OPTIONS     EXERCISE
                 PRICES         OUTSTANDING      LIFE        PRICE     EXERCISABLE    PRICE
            -----------------   -----------   -----------   --------   -----------   --------
            <S>                 <C>           <C>           <C>        <C>           <C>
            $ 4.31 -- $12.38       54,178        9.38        $10.08        1,500      $ 5.66
             13.59 --  13.59      170,389        9.17         13.59           --          --
             13.69 --  14.81       50,875        9.00         14.72        2,209       13.78
             15.19 --  15.19      323,018        9.04         15.19       77,321       15.19
             18.75 --  82.68       49,808        7.02         30.86       30,219       36.32
             ---------------      -------        ----        ------      -------      ------
            $ 4.31 -- $82.68      648,268        8.94        $15.51      111,249      $20.77
             ===============      =======        ====        ======      =======      ======
</TABLE>

     Employee Stock Purchase Plans--On May 28, 1996, the stockholders approved
the 1996 Employee Stock Purchase Plan (the "1996 ESPP"). The 1996 ESPP allows
eligible employees the right to purchase common stock, through payroll
deductions not exceeding 10% of their compensation, at the lower of 85% of the
market price at the beginning or the end of each six-month offering period.
During 1996, 1997 and 1998, 15,614, 50,447 and 85,996 shares were issued at an
average price per share of $23.91, $15.87 and $6.39, respectively. At December
31, 1998, 14,609 shares are available for future issuance.

     On January 26, 1999, the stockholders approved the 1999 Employee Stock
Purchase Plan ( the "1999 ESPP"). The 1999 ESPP allows eligible employees the
right to purchase common stock, through payroll deductions not exceeding 10% of
their compensation, at the lower of 85% of the market price at the beginning or
the end of each six-month offering period. The stockholders authorized 500,000
shares for future issuance under this plan.

     Accounting for Stock-Based Compensation--Arch accounts for its stock option
and stock purchase plans under APB Opinion No. 25 "Accounting for Stock Issued
to Employees". Since all options have been issued at a grant price equal to fair
market value, no compensation cost has been recognized in the Statement of
Operations. Had compensation cost for these plans been determined consistent
with SFAS No. 123, "Accounting for Stock-Based Compensation", Arch's net income
(loss) and income (loss) per share would have been increased to the following
pro forma amounts:

<TABLE>
<CAPTION>
                                                               YEARS ENDED DECEMBER 31,
                                                      ------------------------------------------
                                                          1996           1997           1998
                                                          ----           ----           ----
                                                       (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                     <C>           <C>            <C>            <C>
Net income (loss):
                                        As reported    $(114,662)     $(181,874)     $(206,051)
                                        Pro forma       (115,786)      (183,470)      (208,065)
Basic net income (loss) per common      As reported       (16.86)        (26.31)        (29.58)
  share
                                        Pro forma         (17.04)        (26.55)        (29.88)
</TABLE>

     Because the SFAS No. 123 method of accounting has not been applied to the
options granted prior to January 1, 1995, the resulting pro forma compensation
cost may not be representative of that to be expected in future years. The fair
value of each option grant is estimated on the date of grant using the
Black-Scholes option pricing model. In computing these pro forma amounts, Arch
has assumed risk-free interest rates of 4.5% - 6%, an expected life of 5 years,
an expected dividend yield of zero and an expected volatility of 50% - 85%.

     The weighted average fair values (computed consistent with SFAS No. 123) of
options granted under all plans in 1996, 1997 and 1998 were $14.85, $10.11 and
$8.34, respectively. The weighted average fair value of shares sold under the
ESPP in 1996, 1997 and 1998 was $16.38, $8.49 and $5.64, respectively.

                                      F-16
<PAGE>   221
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     Stockholders Rights Plan--Upon completion of the USAM Merger, Arch's
existing stockholders rights plan was terminated. In October 1995, Arch's Board
of Directors adopted a new stockholders rights plan (the "Rights") and declared
a dividend of one preferred stock purchase right (a "Right") for each
outstanding share of common stock to stockholders of record at the close of
business on October 25, 1995. Each Right entitles the registered holder to
purchase from Arch one one-thousandth of a share of Series B Junior
Participating Preferred Stock, at a cash purchase price of $150, subject to
adjustment. Pursuant to the Plan, the Rights automatically attach to and trade
together with each share of common stock. The Rights will not be exercisable or
transferable separately from the shares of common stock to which they are
attached until the occurrence of certain events. The Rights will expire on
October 25, 2005, unless earlier redeemed or exchanged by Arch in accordance
with the Plan.

5.  INCOME TAXES

     Arch accounts for income taxes under the provisions of SFAS No. 109
"Accounting for Income Taxes". Deferred tax assets and liabilities are
determined based on the difference between the financial statement and tax bases
of assets and liabilities, given the provisions of enacted laws.

     The components of the net deferred tax asset (liability) recognized in the
accompanying consolidated balance sheets at December 31, 1997 and 1998 are as
follows (in thousands):

<TABLE>
<CAPTION>
                                                       1997        1998
                                                       ----        ----
<S>                                                  <C>         <C>
Deferred tax assets................................  $134,944    $179,484
Deferred tax liabilities...........................   (90,122)    (67,652)
                                                     --------    --------
                                                       44,822     111,832
Valuation allowance................................   (44,822)   (111,832)
                                                     --------    --------
                                                     $     --    $     --
                                                     ========    ========
</TABLE>

     The approximate effect of each type of temporary difference and
carryforward at December 31, 1997 and 1998 is summarized as follows (in
thousands):

<TABLE>
<CAPTION>
                                                           1997        1998
                                                         --------    --------
<S>                                                      <C>         <C>
Net operating losses...................................  $106,214    $128,213
Intangibles and other assets...........................   (87,444)    (62,084)
Depreciation of property and equipment.................    24,388      39,941
Accruals and reserves..................................     1,664       5,762
                                                         --------    --------
                                                           44,822     111,832
Valuation allowance....................................   (44,822)   (111,832)
                                                         --------    --------
                                                         $     --    $     --
                                                         ========    ========
</TABLE>

     The effective income tax rate differs from the statutory federal tax rate
primarily due to the nondeductibility of goodwill amortization and the inability
to recognize the benefit of current net operating loss ("NOL") carryforwards.
The NOL carryforwards expire at various dates through 2013. The Internal Revenue
Code contains provisions that may limit the NOL carryforwards available to be
used in any given year if certain events occur, including significant changes in
ownership, as defined.

     The Company has established a valuation reserve against its net deferred
tax asset until it becomes more likely than not that this asset will be realized
in the foreseeable future.

                                      F-17
<PAGE>   222
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

6.  COMMITMENTS AND CONTINGENCIES

     In the ordinary course of business, the Company and its subsidiaries are
defendants in a variety of judicial proceedings. In the opinion of management,
there is no proceeding pending, or to the knowledge of management threatened,
which, in the event of an adverse decision, would result in a material adverse
change in the financial condition of the Company.

     Arch has operating leases for office and transmitting sites with lease
terms ranging from one month to approximately ten years. In most cases, Arch
expects that, in the normal course of business, leases will be renewed or
replaced by other leases.

     Future minimum lease payments under noncancellable operating leases at
December 31, 1998 are as follows (in thousands):

<TABLE>
<CAPTION>
YEAR ENDING DECEMBER 31,
- ------------------------
<S>                                                           <C>
1999........................................................  $21,372
2000........................................................   13,826
2001........................................................    8,853
2002........................................................    6,026
2003........................................................    2,495
Thereafter..................................................    1,516
                                                              -------
          Total.............................................  $54,088
                                                              =======
</TABLE>

     Total rent expense under operating leases for the years ended December 31,
1996, 1997 and 1998 approximated $14.7 million, $19.8 million and $19.6 million,
respectively.

7.  EMPLOYEE BENEFIT PLANS

     Retirement Savings Plan--Arch has a retirement savings plan, qualifying
under Section 401(k) of the Internal Revenue Code covering eligible employees,
as defined. Under the plan, a participant may elect to defer receipt of a
liquidation percentage of the compensation which would otherwise be payable to
the participant for any plan year (the deferred amount) provided, however, that
the deferred amount shall not exceed the maximum amount permitted under Section
401(k) of the Internal Revenue Code. The plan provides for employer matching
contributions. Matching contributions for the years ended December 31, 1996,
1997 and 1998 approximated $217,000, $302,000 and $278,000, respectively.

8.  TOWER SITE SALE

     In April 1998, Arch announced an agreement to sell certain of its tower
site assets (the "Tower Site Sale") for approximately $38.0 million in cash
(subject to adjustment), of which $1.3 million was paid to entities affiliated
with Benbow in payment for certain assets owned by such entities and included in
the Tower Site Sale. In the Tower Site Sale, Arch is selling communications
towers, real estate, site management contracts and/or leasehold interests
involving 133 sites in 22 states and will rent space on the towers on which it
currently operates communications equipment to service its own paging network.
Arch used its net proceeds from the Tower Site Sale to repay indebtedness under
the API Credit Facility. Arch held the initial closing of the Tower Site Sale on
June 26, 1998 with gross proceeds to Arch of approximately $12.0 million
(excluding $1.3 million which was paid to entities affiliated with Benbow for
certain assets which such entities sold as part of this transaction) and held a
second closing on September 29, 1998 with gross proceeds to Arch of
approximately $20.4 million.

     Arch entered into options to repurchase each site and until this continuing
involvement ends the gain is deferred and included in other long-term
liabilities. At December 31, 1998, Arch had sold 117 of the

                                      F-18
<PAGE>   223
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

133 sites, which resulted in a total gain of approximately $23.5 million and
through December 31, 1998 approximately $2.5 million of this gain had been
recognized in the statement of operations and is included in operating income.

9.  DIVISIONAL REORGANIZATION

     In June 1998, Arch's Board of Directors approved a reorganization of Arch's
operations (the "Divisional Reorganization"). As part of the Divisional
Reorganization, which is being implemented over a period of 18 to 24 months,
Arch has consolidated its former Midwest, Western and Northern divisions into
four existing operating divisions and is in the process of consolidating certain
regional administrative support functions, such as customer service,
collections, inventory and billing, to reduce redundancy and take advantage of
various operating efficiencies. In connection with the Divisional
Reorganization, Arch (i) anticipates a net reduction of approximately 10% of its
workforce, (ii) is closing certain office locations and redeploying other assets
and (iii) recorded a restructuring charge of $14.7 million, or $2.10 per share
(basic and diluted) in 1998. The restructuring charge consisted of approximately
(i) $9.7 million for employee severance, (ii) $3.5 million for lease obligations
and terminations and (iii) $1.5 million of other costs.

     The provision for lease obligations and terminations relates primarily to
future lease commitments on local, regional and divisional office facilities
that will be closed as part of the Divisional Reorganization. The charge
represents future lease obligations, on such leases past the dates the offices
will be closed by the Company, or for certain leases, the cost of terminating
the leases prior to their scheduled expiration. Cash payments on the leases and
lease terminations will occur over the remaining lease terms, the majority of
which expire prior to 2001.

     Through the elimination of certain local and regional administrative
operations and the consolidation of certain support functions, the Company will
eliminate approximately 280 net positions. As a result of eliminating these
positions, the Company will involuntarily terminate an estimated 900 personnel.
The majority of the positions to be eliminated will be related to customer
service, collections, inventory and billing functions in local and regional
offices which will be closed as a result of the Divisional Reorganization. As of
December 31, 1998, 217 employees had been terminated due to the Divisional
Reorganization. The majority of the remaining severance and benefits costs to be
paid by the Company will be paid during 1999.

     The Company's restructuring activity as of December 31, 1998 is as follows
(in thousands):

<TABLE>
<CAPTION>
                                             RESERVE
                                            INITIALLY     UTILIZATION OF    REMAINING
                                           ESTABLISHED       RESERVE         RESERVE
                                           -----------    --------------    ---------
<S>                                        <C>            <C>               <C>
Severance costs..........................    $ 9,700          $2,165         $ 7,535
Lease obligation costs...................      3,500             366           3,134
Other costs..............................      1,500             260           1,240
                                             -------          ------         -------
          Total..........................    $14,700          $2,791         $11,909
                                             =======          ======         =======
</TABLE>

10.  SEGMENT REPORTING

     The Company operates in one industry: providing wireless messaging
services. On December 31, 1998, the Company operated approximately 175 retail
stores in 35 states of the United States.

                                      F-19
<PAGE>   224
                        ARCH COMMUNICATIONS GROUP, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

11.  QUARTERLY FINANCIAL RESULTS (UNAUDITED)

     Quarterly financial information for the years ended December 31, 1997 and
1998 is summarized below (in thousands, except per share amounts):

<TABLE>
<CAPTION>
                                                 FIRST      SECOND     THIRD      FOURTH
                                                QUARTER    QUARTER    QUARTER    QUARTER
                                                --------   --------   --------   --------
<S>                                             <C>        <C>        <C>        <C>
YEAR ENDED DECEMBER 31, 1997:
Revenues......................................  $ 95,539   $ 98,729   $101,331   $101,242
     Operating income (loss)..................   (26,632)   (29,646)   (27,208)   (18,529)
     Net income (loss)........................   (45,815)   (49,390)   (47,645)   (39,024)
Basic net income (loss) per common share:
     Net income (loss)........................     (6.63)     (7.14)     (6.87)     (5.64)
YEAR ENDED DECEMBER 31, 1998:
     Revenues.................................  $102,039   $103,546   $104,052   $103,998
     Operating income (loss)..................   (19,418)   (35,356)   (20,783)   (18,872)
     Income (loss) before extraordinary
       item...................................   (45,839)   (62,277)   (47,994)   (48,221)
     Extraordinary charge.....................        --     (1,720)        --         --
     Net income (loss)........................   (45,839)   (63,997)   (47,994)   (48,221)
Basic net income (loss) per common share:
  Income (loss) before extraordinary item.....     (6.60)     (8.91)     (6.90)     (6.93)
  Extraordinary charge........................        --       (.24)        --         --
  Net income (loss)...........................     (6.60)     (9.15)     (6.90)     (6.93)
</TABLE>

12.  SUBSEQUENT EVENT

     On June 28, 1999, Arch effected a one for three reverse stock split. All
share and per share data included in these financial statements for all periods
presented have been adjusted to give effect to this reverse split.

                                      F-20
<PAGE>   225

                        ARCH COMMUNICATIONS GROUP, INC.

                     CONSOLIDATED CONDENSED BALANCE SHEETS
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                              DECEMBER 31,   SEPTEMBER 30,
                                                                  1998           1999
                                                              ------------   -------------
                                                                              (UNAUDITED)
<S>                                                           <C>            <C>
                                          ASSETS
Current assets:
     Cash and cash equivalents..............................   $    1,633     $   21,488
     Accounts receivable, net...............................       30,753         57,570
     Inventories............................................       10,319         10,163
     Prepaid expenses and other.............................        8,007          9,959
                                                               ----------     ----------
          Total current assets..............................       50,712         99,180
                                                               ----------     ----------
Property and equipment, at cost.............................      428,173        697,337
Less accumulated depreciation and amortization..............     (209,128)      (288,281)
                                                               ----------     ----------
Property and equipment, net.................................      219,045        409,056
                                                               ----------     ----------
Intangible and other assets, net............................      634,528        916,282
                                                               ----------     ----------
                                                               $  904,285     $1,424,518
                                                               ==========     ==========
                      LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
     Current maturities of long-term debt...................   $    1,250     $    3,060
     Accounts payable.......................................       25,683         23,444
     Accrued restructuring..................................       11,909         18,239
     Accrued interest.......................................       20,997         31,861
     Accrued expenses and other liabilities.................       27,175         93,110
                                                               ----------     ----------
          Total current liabilities.........................       87,014        169,714
                                                               ----------     ----------
Long-term debt..............................................    1,003,499      1,357,743
                                                               ----------     ----------
Other long-term liabilities.................................       27,235         77,953
                                                               ----------     ----------
Stockholders' equity (deficit):
     Preferred stock -- $.01 par value......................            3              3
     Common stock -- $.01 par value.........................           71            481
     Additional paid-in capital.............................      378,218        639,559
     Accumulated deficit....................................     (591,755)      (820,935)
                                                               ----------     ----------
          Total stockholders' equity (deficit)..............     (213,463)      (180,892)
                                                               ----------     ----------
                                                               $  904,285     $1,424,518
                                                               ==========     ==========
</TABLE>

  The accompanying notes are an integral part of these consolidated financial
                                  statements.
                                      F-21
<PAGE>   226

                        ARCH COMMUNICATIONS GROUP, INC.
                CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS
        (UNAUDITED AND IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                               THREE MONTHS ENDED           NINE MONTHS ENDED
                                                 SEPTEMBER 30,                SEPTEMBER 30,
                                            ------------------------    -------------------------
                                               1998         1999           1998          1999
                                            ----------   -----------    ----------    -----------
<S>                                         <C>          <C>            <C>           <C>
Service, rental, and maintenance
revenues................................    $   93,546   $   190,798    $  277,826    $   403,607
Product sales...........................        10,506        15,391        31,811         36,963
                                            ----------   -----------    ----------    -----------
          Total revenues................       104,052       206,189       309,637        440,570
Cost of products sold...................        (7,173)      (10,459)      (21,863)       (24,988)
                                            ----------   -----------    ----------    -----------
                                                96,879       195,730       287,774        415,582
                                            ----------   -----------    ----------    -----------
Operating expenses:
     Service, rental, and maintenance...        20,403        43,035        60,812         91,421
     Selling............................        12,658        26,545        36,902         57,589
     General and administrative.........        28,011        60,622        84,527        123,643
     Depreciation and amortization......        56,590        94,803       164,990        222,836
     Restructuring charge...............            --        (2,200)       14,700         (2,200)
                                            ----------   -----------    ----------    -----------
          Total operating expenses......       117,662       222,805       361,931        493,289
                                            ----------   -----------    ----------    -----------
Operating income (loss).................       (20,783)      (27,075)      (74,157)       (77,707)
Interest expense, net...................       (26,863)      (39,740)      (76,658)       (98,927)
Other expense...........................          (348)         (924)       (1,676)       (44,396)
Equity in loss of affiliate.............            --            --        (2,219)        (3,200)
                                            ----------   -----------    ----------    -----------
Income (loss) before extraordinary item
  and accounting change.................       (47,994)      (67,739)     (154,710)      (224,230)
                                            ----------   -----------    ----------    -----------
Extraordinary charge from early
  extinguishment of debt................            --            --        (1,720)            --
Cumulative effect of accounting
  change................................            --            --                       (3,361)
                                            ----------   -----------    ----------    -----------
Net income (loss).......................       (47,994)      (67,739)     (156,430)      (227,591)
Preferred stock dividend................          (515)         (546)         (515)        (1,589)
                                            ----------   -----------    ----------    -----------
Net income (loss) to common
  stockholders..........................    $  (48,509)  $   (68,285)   $ (156,945)   $  (229,180)
                                            ==========   ===========    ==========    ===========
Basic/diluted net income (loss) per
  common share before extraordinary
  charge and accounting change..........    $    (6.91)  $     (1.42)   $   (22.20)   $     (9.00)
Extraordinary charge per basic/diluted
  common share..........................            --            --         (0.25)            --
Cumulative effect of accounting change
  per basic/diluted common share........            --            --            --          (0.13)
                                            ----------   -----------    ----------    -----------
Basic/diluted net income (loss) per
  common share..........................    $    (6.91)  $     (1.42)   $   (22.45)   $     (9.13)
                                            ==========   ===========    ==========    ===========
Basic/diluted weighted average number of
  common shares outstanding.............     7,022,370    48,060,782     6,989,427     25,088,969
                                            ==========   ===========    ==========    ===========
</TABLE>

  The accompanying notes are an integral part of these consolidated financial
                                  statements.
                                      F-22
<PAGE>   227

                        ARCH COMMUNICATIONS GROUP, INC.

                CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
                          (UNAUDITED AND IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                NINE MONTHS ENDED
                                                                  SEPTEMBER 30,
                                                              ---------------------
                                                                1998        1999
                                                              ---------   ---------
<S>                                                           <C>         <C>
Net cash provided by operating activities...................  $  61,276   $  76,422
                                                              ---------   ---------
Cash flows from investing activities:
     Additions to property and equipment, net...............    (58,029)    (65,035)
     Additions to intangible and other assets...............    (27,756)    (18,151)
     Net proceeds from tower site sale......................     30,139       3,046
     Acquisition of paging company, net of cash acquired....         --    (518,729)
                                                              ---------   ---------
Net cash used for investing activities......................    (55,646)   (598,869)
                                                              ---------   ---------
Cash flows from financing activities:
     Issuance of long-term debt.............................    455,964     466,058
     Repayment of long-term debt............................   (484,013)   (140,999)
     Net proceeds from sale of preferred stock..............     25,000          --
     Net proceeds from sale of common stock.................        662     217,243
                                                              ---------   ---------
Net cash provided by (used for) financing activities........     (2,387)    542,302
                                                              ---------   ---------
Net increase in cash and cash equivalents...................      3,243      19,855
Cash and cash equivalents, beginning of period..............      3,328       1,633
                                                              ---------   ---------
Cash and cash equivalents, end of period....................  $   6,571   $  21,488
                                                              =========   =========
Supplemental disclosure:
     Interest paid..........................................  $  42,962   $  58,734
     Accretion of discount on senior notes..................  $  27,430   $  30,995
     Issuance of common stock in acquisition of paging
      company...............................................  $      --   $  20,083
     Liabilities assumed in acquisition of paging company...  $      --   $ 135,676
</TABLE>

  The accompanying notes are an integral part of these consolidated financial
                                  statements.
                                      F-23
<PAGE>   228
                        ARCH COMMUNICATIONS GROUP, INC.

              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                  (UNAUDITED)

     (a) Preparation of Interim Financial Statements -- The consolidated
condensed financial statements of Arch Communications Group, Inc. ("Arch" or the
"Company") have been prepared in accordance with the rules and regulations of
the Securities and Exchange Commission. The financial information included
herein, other than the consolidated condensed balance sheet as of December 31,
1998, has been prepared by management without audit by independent accountants
who do not express an opinion thereon. The consolidated condensed balance sheet
at December 31, 1998 has been derived from, but does not include all the
disclosures contained in, the audited consolidated financial statements for the
year ended December 31, 1998. In the opinion of management, all of these
unaudited statements include all adjustments and accruals consisting only of
normal recurring accrual adjustments which are necessary for a fair presentation
of the results of all interim periods reported herein. These consolidated
condensed financial statements should be read in conjunction with the
consolidated financial statements and accompanying notes included in Arch's
Annual Report on Form 10-K for the year ended December 31, 1998. The results of
operations for the periods presented are not necessarily indicative of the
results that may be expected for a full year.

     (b) Intangible and Other Assets -- Intangible and other assets, net of
accumulated amortization, are comprised of the following (in thousands):

<TABLE>
<CAPTION>
                                                       SEPTEMBER 30,   DECEMBER 31,
                                                           1999            1998
                                                       -------------   ------------
                                                        (UNAUDITED)
<S>                                                    <C>             <C>
Goodwill.............................................    $259,877        $271,808
Purchased FCC licenses...............................     367,014         256,519
Purchased subscriber lists...........................     258,530          56,825
Deferred financing costs.............................      25,318          22,072
Investment in Benbow PCS Ventures, Inc. ("Benbow")...          --          11,347
Investment in CONXUS Communications, Inc.
  ("CONXUS").........................................          --           6,500
Non-competition agreements...........................       1,063           1,790
Other................................................       4,480           7,667
                                                         --------        --------
                                                         $916,282        $634,528
                                                         ========        ========
</TABLE>

     In June 1999, Arch, Benbow and Ms. June Walsh, who holds a 50.1% equity
interest in Benbow, agreed that:

     -  the stockholders agreement, the management agreement and the employment
        agreement governing the establishment and operation of Benbow will be
        terminated

     -  Benbow will not make any further FCC payments and will not pursue
        construction of an N-PCS system

     -  Arch will not be obligated to fund FCC payments or construction of an
        N-PCS system by Benbow

     -  the parties will seek FCC approval of the forgiveness of Benbow's
        remaining payment obligations and the transfer of Ms. Walsh's equity
        interest in Benbow to Arch

     -  the closing of the transaction will occur on the earlier of January 23,
        2001 or receipt of FCC approval

     -  Arch will pay Ms. Walsh, in installments, an aggregate amount of $3.5
        million (if the transaction closes before January 23, 2001) or $3.8
        million (if the transaction closes on January 23, 2001)

                                      F-24
<PAGE>   229
                        ARCH COMMUNICATIONS GROUP, INC.

              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                  (UNAUDITED)

As a result of these arrangements, Benbow will not have any meaningful business
operations and is unlikely to retain its N-PCS licenses. Therefore, Arch has
written off substantially all of its investment in Benbow in the amount of $8.2
million. Arch has also accrued the payment to Ms. Walsh of $3.8 million and
legal and other expenses of approximately $1.0 million which is included in
accrued expenses. In addition, Arch guaranteed Benbow's obligations in
conjunction with Benbow's purchase of the stock of PageCall in June 1998. Since
it is unlikely that Benbow will be able to meet these obligations and Arch is
currently required to settle the obligation in stock, Arch has recorded the
issuance of $22.8 million of its common stock in additional paid-in capital as a
charge to operations, to satisfy the obligation in April 2000.

     On May 18, 1999, CONXUS filed for Chapter 11 protection in the U.S.
Bankruptcy Court in Delaware, which case was converted to a case under Chapter 7
on August 17, 1999. In June 1999, Arch wrote-off its $6.5 million investment in
CONXUS. On November 3, 1999, in order to document its disposition of any
interest it has, if any, in CONXUS, Arch offered to transfer to CONXUS its
shares in CONXUS for no consideration.

     (c) Acquisition of MobileMedia -- On June 3, 1999 Arch completed its
acquisition of MobileMedia Communications, Inc. ("MobileMedia") for $674.5
million, consisting of cash paid of $518.7 million, including direct transaction
costs, 4,781,656 shares of Arch common stock valued at $20.1 million and the
assumption of liabilities of $135.7 million. The cash payments were financed
through the issuance of approximately 36.2 million shares of Arch common stock
in a rights offering for $6.00 per share, the issuance of $147.0 million
principal amount of 13 3/4% senior notes due 2008 (see note (d)) and additional
borrowings under the Company's credit facility.

     The purchase price was allocated based on the fair values of assets
acquired and liabilities assumed. The allocation is subject to change based on
finalization of asset appraisals. The acquisition has been accounted for as a
purchase, and the results of MobileMedia's operations have been included in the
consolidated financial statements from the date of the acquisition. Goodwill
resulting from the acquisition is being amortized over a ten-year period using
the straight-line method.

     The liabilities assumed, referred to above, include an unfavorable lease
accrual related to MobileMedia's rentals on communications towers which were in
excess of market rental rates. This accrual amounted to approximately $52.4
million and is included in other long-term liabilities. This accrual will be
amortized over the remaining lease term of 14 1/4 years.

     Concurrent with the consummation of the acquisition, Arch commenced the
development of a plan to integrate the operations of MobileMedia. The
liabilities assumed, referred to above, also included a $13.1 million
restructuring accrual to cover the costs to eliminate redundant headcount and
facilities in connection with the overall integration of operations (see note
(h)).

     The following unaudited pro forma summary presents the consolidated results
of operations as if the acquisition had occurred at the beginning of the periods
presented, after giving effect to certain adjustments, including depreciation
and amortization of acquired assets and interest expense on acquisition debt.
These pro forma results have been prepared for comparative purposes only and do
not purport to be indicative of what would have occurred had the acquisition
been made at the beginning of the period presented, or of results that may occur
in the future.

                                      F-25
<PAGE>   230
                        ARCH COMMUNICATIONS GROUP, INC.

              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                              NINE MONTHS ENDED
                                                                SEPTEMBER 30,
                                                          -------------------------
                                                             1999          1998
                                                          -----------   -----------
                                                          (IN THOUSANDS, EXCEPT PER
                                                               SHARE AMOUNTS)
<S>                                                       <C>           <C>
Revenues................................................   $616,432      $643,665
Income (loss) before extraordinary item.................   (251,632)     (127,165)
Net income (loss).......................................   (251,632)     (128,885)
Basic/diluted net income (loss) per common share........      (5.27)        (2.67)
</TABLE>

     In connection with the acquisition of MobileMedia, Arch issued
approximately 48.3 million warrants to purchase Arch common stock. Each warrant
represents the right to purchase one-third of one share of Arch common stock at
an exercise price of $3.01 ($9.03 per share). The warrants expire on September
1, 2001.

     (d) Senior Notes -- On June 3, 1999, Arch Communications, Inc. ("ACI"), a
wholly-owned subsidiary of Arch, received the proceeds of an offering of $147.0
million principal amount at maturity of 13 3/4% Senior

     Notes due 2008 (the "13 3/4% Notes") to qualified institutional buyers
under Rule 144A promulgated under the Securities Act of 1933, as amended. The
13 3/4% Notes were sold at an initial price to investors of 95.091% for net
proceeds of $134.6 million (after deducting the discount to the Initial
Purchasers and offering expenses). The 13 3/4% Notes mature on April 15, 2008
and bear interest at a rate of 13 3/4% per annum, payable semi-annually in
arrears on April 15 and October 15 of each year, commencing October 15, 1999.

     The indenture governing the 13 3/4% Notes (the "Indenture") contains
certain covenants that, among other things, limit the ability of ACI to incur
additional indebtedness, issue preferred stock, pay dividends or make other
distributions, repurchase Capital Stock (as defined in the Indenture), repay
subordinated indebtedness or make other Restricted Payments (as defined in the
Indenture), create certain liens, enter into certain transactions with
affiliates, sell assets, issue or sell Capital Stock of ACI's Restricted
Subsidiaries (as defined in the Indenture) or enter into certain mergers and
consolidations.

     (e) Reverse Stock Split -- On June 28, 1999, Arch effected a one for three
reverse stock split. All share and per share data included in this Quarterly
Report for all periods presented have been adjusted to give effect to this
reverse split.

     (f) Change in Accounting Principle -- In April 1998, the Accounting
Standards Executive Committee of the Financial Accounting Standards Board issued
Statement of Position 98-5 ("SOP 98-5") "Reporting on the Costs of Start-Up
Activities". SOP 98-5 requires costs of start-up activities and organization
costs to be expensed as incurred. Arch adopted SOP 98-5 effective January 1,
1999. Initial application of SOP 98-5 resulted in a $3.4 million charge, which
was reported as the cumulative effect of a change in accounting principle. This
charge represents the unamortized portion of start-up and organization costs,
which had been deferred in prior years.

     (g) Divisional Reorganization -- In conjunction with the completion of the
MobileMedia merger, the timing and implementation of the divisional
reorganization announced in June 1998 was reviewed by Arch management. The plan
was reviewed within the context of the combined company integration plan which
was approved by the Company in the third quarter of 1999. After a thorough
review it was decided that significant changes needed to be made to the
divisional reorganization plan. In the quarter ended September 30, 1999 the
Company identified certain of its facilities and network leases that will not be
utilized following the integration of the Company and MobileMedia, resulting in
an additional charge of

                                      F-26
<PAGE>   231
                        ARCH COMMUNICATIONS GROUP, INC.

              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                  (UNAUDITED)

$2.6 million. This charge was offset by reductions to previously provided
severance and other costs of $4.8 million. As of September 30, 1999, 426
employees had been terminated due to the divisional reorganization.

     The Company's restructuring activity as of September 30, 1999 was as
follows (in thousands):

<TABLE>
<CAPTION>
                                               RESERVE
                                              INITIALLY    UTILIZATION OF    RESERVE     REMAINING
                                             ESTABLISHED      RESERVE       ADJUSTMENT    RESERVE
                                             -----------   --------------   ----------   ---------
<S>                                          <C>           <C>              <C>          <C>
Severance costs............................    $ 9,700         $4,541        $(3,547)     $1,612
Lease obligation costs.....................      3,500            737          2,570       5,333
Other costs................................      1,500            277         (1,223)         --
                                               -------         ------        -------      ------
          Total............................    $14,700         $5,555        $(2,200)     $6,945
                                               =======         ======        =======      ======
</TABLE>

     (h) MobileMedia Acquisition Reserve -- On June 3, 1999, Arch completed its
acquisition of MobileMedia and commenced the development of plans to integrate
the operations of MobileMedia. During the third quarter of 1999, Arch approved
plans covering the elimination of redundant headcount and facilities in
connection with the overall integration of operations. To the extent that it is
determined that headcount and facilities acquired with MobileMedia should be
eliminated, the purchase price of the acquisition will be increased to cover the
costs of executing the plan. It is expected that the integration activity
relating to the MobileMedia merger, which commenced on July 1, 1999, will take
approximately 18 months.

     In connection with the MobileMedia acquisition, Arch anticipates a net
reduction of approximately 10% of MobileMedia's workforce and the closing of
certain facilities and tower sites. This resulted in the establishment of a
$13.1 million acquisition reserve which is included as part of the purchase
price of MobileMedia. The initial acquisition reserve consisted of approximately
(i) $5.6 million for employee severance, (ii) $7.0 million for lease obligations
and terminations and (iii) $0.5 million of other costs. As of September 30,
1999, 77 former MobileMedia employees had been terminated due to the
acquisition. The acquisition reserve will continue to be evaluated in the event
that certain assumptions change in the future.

     The MobileMedia acquisition reserve activity as of September 30, 1999 was
as follows (in thousands):

<TABLE>
<CAPTION>
                                                 RESERVE
                                                INITIALLY    UTILIZATION OF   REMAINING
                                               ESTABLISHED      RESERVE        RESERVE
                                               -----------   --------------   ---------
<S>                                            <C>           <C>              <C>
Severance costs..............................    $ 5,658         $1,839        $ 3,819
Lease obligation costs.......................      6,975             --          6,975
Other costs..................................        500             --            500
                                                 -------         ------        -------
          Total..............................    $13,133         $1,839        $11,294
                                                 =======         ======        =======
</TABLE>

     (i) Subsequent Event -- Equity Issued in Exchange for Debt -- In October
1999, Arch completed transactions with four bondholders in which Arch issued an
aggregate of 3,136,665 shares of Arch common stock and warrants to purchase
540,487 shares of Arch common stock for $9.03 per share in exchange for $25.2
million accreted value of debt securities. Under two of the exchange agreements,
Arch issued 809,545 shares of Arch common stock and warrants to purchase 540,487
shares of Arch common stock for $9.03 per share in exchange for $8.9 million
principal amount of Arch 6 3/4% Convertible Subordinated Debentures Due 2003
(the "Convertible Debentures"). Under the remaining exchange agreements, Arch
issued 2,327,120 shares of Arch common stock in exchange for $16.3 million
accreted value ($19.0 million maturity value) of its 10 7/8% Senior Discount
Notes due 2008 (the "Senior Discount Notes"). Following

                                      F-27
<PAGE>   232
                        ARCH COMMUNICATIONS GROUP, INC.

              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                  (UNAUDITED)

these transactions, Arch has $4.5 million in principal amount of the Convertible
Debentures and $387.1 million accreted value (at October 31, 1999) ($448.4
million maturity value) of the Senior Discount Notes outstanding.

     (j) Subsequent Event -- Merger Agreement -- In November 1999, Arch signed a
definitive agreement (the "Merger Agreement") with Paging Network, Inc.
("PageNet") pursuant to which PageNet will merge with a wholly owned subsidiary
of Arch (the "Merger"). Each outstanding share of PageNet common stock will be
converted into 0.1247 share of Arch common stock in the Merger.

     Under the Merger Agreement, PageNet is required to make an exchange offer
(the "PageNet Exchange Offer") of PageNet common stock to holders of its
outstanding 8.875% Senior Subordinated Notes due 2006 (the "8.875% Notes"), its
10.125% Senior Subordinated Notes due 2007 (the "10.125% Notes") and its 10%
Senior Subordinated Notes due 2008 (the "10% Notes"), having an aggregate
outstanding principal amount of $1.2 billion. Under the PageNet Exchange Offer,
an aggregate of 616,830,757 shares of PageNet common stock, together with 68.9%
of the equity interest in PageNet's subsidiary, Vast Solutions, would be
exchanged for all of the 8.875% Notes, 10.125% Notes and 10% Notes
(collectively, the "PageNet Notes"), in the aggregate. In connection with the
Merger, PageNet would distribute to its stockholders (other than holders who
received shares in the PageNet Exchange Offer), 11.6% of the equity interests in
Vast Solutions. After the Merger, PageNet would retain 19.5% of the equity
interests of Vast Solutions.

     Under the Merger Agreement Arch is required to make an exchange offer (the
"Arch Exchange Offer") of 29,651,984 shares of its common stock (in the
aggregate) for all of its Senior Discount Notes, and to convert all of its
outstanding shares of Series C Convertible Preferred Stock ("Series C Preferred
Stock") into 2,104,142 shares of its common stock.

     If the PageNet Exchange Offer and the Arch Exchange Offer were fully
subscribed, immediately following the Merger (and the issuance of Arch common
stock in exchange for PageNet common stock, in the Arch Exchange Offer and upon
the conversion of Series C Preferred Stock), current holders of Arch's common
stock would own approximately 29.6% of the outstanding Arch common stock,
holders of Series C Preferred Stock would own approximately 1.2% of the
outstanding Arch common stock, holders of the Senior Discount Notes would own
approximately 17.6% of the outstanding Arch common stock, current holders of
PageNet common stock would own approximately 7.5% of the outstanding Arch common
stock and current holders of the PageNet Notes (in the aggregate) would own
approximately 44.5% of the outstanding Arch common stock. In addition, following
the Merger Arch would have, on a pro forma basis, total debt of approximately
$1.8 billion.

     Under the Merger Agreement, the Arch Board of Directors at the closing
would consist of 12 individuals, at least six of whom would be designated by the
existing Arch Board of Directors. The PageNet Board of Directors would designate
three members, and the three largest holders of PageNet Notes would each be
entitled to designate one member. To the extent any such holder of PageNet Notes
did not elect to designate a director, the number of directors designated by the
Arch Board of Directors would increase.

     Arch expects the Merger, which has been approved by the Boards of Directors
of Arch and PageNet, but is subject to customary regulatory review, stockholder
approval, other third-party consents and the completion of the exchange offers
and preferred stock conversion, to be completed during the first half of 2000.
Each of the PageNet Exchange Offer and the Arch Exchange Offer is conditioned
upon acceptance by the holders of 97.5% of the PageNet Notes and Senior Discount
Notes, respectively.

     Under the Merger Agreement, PageNet is required to include a "prepackaged"
plan of reorganization under Chapter 11 of the U.S. Bankruptcy Code in the
materials relating to the PageNet Exchange Offer,

                                      F-28
<PAGE>   233
                        ARCH COMMUNICATIONS GROUP, INC.

              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                  (UNAUDITED)

and to solicit consents for this prepackaged plan from holders of the PageNet
Notes and its senior creditors. In certain circumstances PageNet has agreed
either to file the prepackaged plan in lieu of completing the PageNet Exchange
Offer or to pay to Arch a termination fee.

     The Merger Agreement provides that under certain circumstances a fee may be
payable by Arch or PageNet upon termination of the agreement. These
circumstances include withdrawal of the recommendation or approval of the Merger
Agreement or the Merger by the Arch or PageNet Board of Directors, the failure
of stockholders or noteholders to approve the transaction or exchange followed
by the making of an alternative proposal and Arch or PageNet entering into an
agreement with a third party within 12 months of such termination, and PageNet's
failure to file a prepackaged plan in certain circumstances. The termination fee
payable by Arch or PageNet under the Merger Agreement is $40.0 million.

     The Merger Agreement provides that either party may terminate the agreement
if the Merger is not consummated by June 30, 2000. This termination date is
subject to extension for 90 days for regulatory approval and is subject to
extension to as late as December 31, 2000 under certain circumstances where
PageNet files for protection under the U.S. Bankruptcy Code.

                                      F-29
<PAGE>   234

                         REPORT OF INDEPENDENT AUDITORS

The Board of Directors and shareowners
Paging Network, Inc.

     We have audited the accompanying consolidated balance sheets of Paging
Network, Inc. as of December 31, 1997 and 1998, and the related consolidated
statements of operations, cash flows and shareowners' deficit for each of the
three years in the period ended December 31, 1998. These financial statements
arc the responsibility of the Company's management. Our responsibility is to
express an opinion on these financial statements based on our audits.

     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of Paging Network,
Inc. as of December 31, 1997 and 1998, and the consolidated results of its
operations and its cash flows for each of the three years in the period ended
December 31, 1998, in conformity with generally accepted accounting principles.

                                            /S/  ERNST & YOUNG LLP

Dallas, Texas
February 15, 1999

                                      F-30
<PAGE>   235

                              PAGING NETWORK, INC.

                          CONSOLIDATED BALANCE SHEETS
                    (IN THOUSANDS, EXCEPT SHARE INFORMATION)

<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              -----------------------
                                                                 1997         1998
                                                              ----------   ----------
<S>                                                           <C>          <C>
                                       ASSETS
Current assets:
     Cash and cash equivalents..............................  $    2,924   $    3,077
     Accounts receivable (less allowance for doubtful
      accounts of $6,670 and $11,119 in 1997 and 1998,
      respectively).........................................      63,288       84,440
     Inventories............................................      24,114        6,379
     Prepaid expenses and other assets......................      14,888       15,065
                                                              ----------   ----------
          Total current assets..............................     105,214      108,961
Property, equipment, and leasehold improvements, at cost....   1,387,560    1,452,870
     Loss accumulated depreciation..........................    (469,526)    (547,599)
                                                              ----------   ----------
          Net property, equipment and leasehold
            improvements....................................     918,034      905,271
Other non-current assets, at cost...........................     659,661      629,372
     Less accumulated amortization..........................     (85,676)     (62,360)
                                                              ----------   ----------
                                                                 573,985      567,012
                                                              ----------   ----------
                                                              $1,597,233   $1,581,244
                                                              ==========   ==========
                        LIABILITIES AND SHAREOWNERS' DEFICIT
Current liabilities:
     Accounts payable.......................................  $   42,640   $   96,478
     Accrued expenses.......................................      36,854       49,692
     Accrued interest.......................................      40,085       43,209
     Accrued restructuring costs, current portion...........          --        8,256
     Customer deposits......................................      24,460       22,735
     Deferred revenue.......................................      11,634       15,874
                                                              ----------   ----------
          Total current liabilities.........................     155,673      236,244
                                                              ----------   ----------
Long-term obligations.......................................   1,779,491    1,815,137
Accrued restructuring costs, non-current portion............          --       18,765
Minority interest...........................................          --        1,517
Commitments and contingencies...............................          --           --
Shareowners' deficit:
     Common Stock -- $.01 par, authorized 250,000,000
      shares: issued and outstanding 102,659,915 shares at
      December 31, 1997 and 103,640,554 shares at December
      31, 1998..............................................       1,027        1,036
     Paid-in capital........................................     124,908      132,950
     Accumulated other comprehensive income.................         908        2,378
     Accumulated deficit....................................    (464,774)    (626,783)
                                                              ----------   ----------
          Total shareowners' deficit........................    (337,931)    (490,419)
                                                              ----------   ----------
                                                              $1,597,233   $1,581,244
                                                              ==========   ==========
</TABLE>

                                      F-31
<PAGE>   236

                              PAGING NETWORK, INC.

                      CONSOLIDATED STATEMENT OF OPERATIONS
                    (IN THOUSANDS, EXCEPT SHARE INFORMATION)

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31,
                                                              ----------------------------------
                                                                1996        1997         1998
                                                              ---------   ---------   ----------
<S>                                                           <C>         <C>         <C>
Services, rent and maintenance revenues.....................  $ 685,960   $ 818,461   $  945,524
Product sales...............................................    136,527     142,515      100,503
                                                              ---------   ---------   ----------
          Total revenues....................................    822,487     960,976    1,046,027
Cost of products sold.......................................   (116,647)   (121,487)     (77,672)
                                                              ---------   ---------   ----------
                                                                705,840     839,489      968,355
Operating expenses:
     Services, rent and maintenance.........................    146,896     173,058      210,480
     Selling................................................     82,790     102,995      104,350
     General and administrative.............................    219,317     253,886      320,586
     Depreciation and amortization..........................    213,440     289,442      281,259
     Restructuring charge...................................         --          --       74,000
     Non-recurring charges..................................     22,500      12,600           --
                                                              ---------   ---------   ----------
          Total operating expenses..........................    684,943     831,981      990,675
                                                              ---------   ---------   ----------
Operating income (loss).....................................     20,897       7,508      (22,320)
Other income (expense):
     Interest expense.......................................   (128,014)   (151,380)    (143,762)
     Interest income........................................      3,679       3,689        2,070
     Minority interest......................................         41          56        2,003
     Equity in loss of an unconsolidated subsidiary.........       (923)     (1,276)          --
                                                              ---------   ---------   ----------
          Total other income (expense)......................   (125,217)   (148,911)    (139,689)
                                                              ---------   ---------   ----------
Loss before extraordinary item..............................   (104,320)   (141,403)    (162,009)
Extraordinary loss..........................................         --     (15,544)          --
                                                              ---------   ---------   ----------
Net loss....................................................  $(104,320)  $(156,947)  $ (162,009)
                                                              =========   =========   ==========
Net loss per share (basic and diluted):
     Loss before extraordinary item.........................  $   (1.02)  $   (1.38)  $    (1.57)
     Extraordinary loss.....................................         --       (0.15)          --
                                                              ---------   ---------   ----------
Net loss per share..........................................  $   (1.02)  $   (1.53)  $    (1.57)
                                                              =========   =========   ==========
</TABLE>

                                      F-32
<PAGE>   237

                              PAGING NETWORK, INC.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                    (IN THOUSANDS, EXCEPT SHARE INFORMATION)

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31,
                                                              ---------------------------------
                                                                1996        1997        1998
                                                              ---------   ---------   ---------
<S>                                                           <C>         <C>         <C>
Operating activities:
  Net loss..................................................  $(104,320)  $(156,947)  $(162,009)
  Adjustments to reconcile net loss to cash provided by
     operating activities:
       Restructuring charge.................................         --          --      74,000
       Extraordinary loss...................................         --      15,544          --
       Depreciation.........................................    191,471     258,798     252,234
       Amortization.........................................     21,969      30,644      29,025
       Provision for doubtful accounts......................     14,033      18,343      20,516
       Amortization of debt issuance costs..................      5,261       8,418       4,430
       Minority interest....................................        (41)        (56)     (2,003)
       Non-recurring charges................................     22,500      12,600          --
       Other................................................        923       1,276          --
  Changes in operating assets and liabilities:
       Accounts receivable..................................    (32,787)    (21,542)    (35,081)
       Inventories..........................................     (8,728)     (1,302)     18,349
       Prepaid expenses and other assets....................     (3,377)     (6,016)      9,133
       Accounts payable.....................................     (9,919)    (18,397)     51,626
       Accrued expenses and accrued interest................      7,548       4,286      16,203
       Accrued restructuring costs..........................         --          --      (1,979)
       Customer deposits and deferred revenue...............      5,849       4,854       2,515
                                                              ---------   ---------   ---------
Net cash provided by operating activities...................    110,382     150,503     276,959
                                                              ---------   ---------   ---------
Investing activities:
     Capital expenditures...................................   (437,388)   (328,365)   (297,041)
     Payments for spectrum licenses.........................   (109,236)    (92,856)    (13,065)
     Business acquisitions and joint venture investments....     (9,352)     (7,253)     (7,322)
     Deposits for purchase of subscriber devices............         --     (13,493)         --
     Restricted cash invested in money market instruments...    (27,039)     (6,422)         --
     Other, net.............................................    (18,107)    (11,540)      2,984
                                                              ---------   ---------   ---------
Net cash used in investing activities.......................   (601,122)   (459,929)   (314,444)
                                                              ---------   ---------   ---------
Financing activities:
     Borrowings of long-term obligations....................    223,438     558,317     305,587
     Repayments of long-term obligations....................   (414,250)    (39,000)   (275,555)
     Proceeds from exercise of stock options................      2,825          87       7,606
     Redemption of $200 million senior subordinated notes...         --    (211,750)         --
     Proceeds from Senior Notes offerings...................    500,000          --          --
     Debt issuance costs on Senior Notes offerings..........    (11,250)         --          --
     Debt issuance costs on credit agreements...............     (3,766)         --          --
     Other, net.............................................       (662)        919          --
                                                              ---------   ---------   ---------
Net cash provided by financing activities...................    296,335     308,573      37,638
                                                              ---------   ---------   ---------
Net increase (decrease) in cash and cash equivalents........   (194,405)       (853)        153
Cash and cash equivalents at beginning of year..............    198,182       3,777       2,924
                                                              ---------   ---------   ---------
Cash and cash equivalents at end of year....................  $   3,777   $   2,924   $   3,077
                                                              =========   =========   =========
</TABLE>

                                      F-33
<PAGE>   238

                              PAGING NETWORK, INC.

                CONSOLIDATED STATEMENTS OF SHAREOWNERS' DEFICIT
                  YEAR ENDED DECEMBER 31, 1996, 1997, AND 1998
                    (IN THOUSANDS, EXCEPT SHARE INFORMATION)

<TABLE>
<CAPTION>
                                                               ACCUMULATED
                                                                  OTHER
                                          COMMON   PAID-IN    COMPREHENSIVE   ACCUMULATED   SHAREOWNERS'
                                          STOCK    CAPITAL       INCOME         DEFICIT       DEFICIT
                                          ------   --------   -------------   -----------   ------------
<S>                                       <C>      <C>        <C>             <C>           <C>
Balance, December 31, 1995..............  $1,022   $121,701      $   --        $(203,507)    $ (80,784)
     Net loss...........................     --          --          --         (104,320)     (104,320)
     Foreign currency translation
       adjustments......................     --          --         104               --           104
                                          ------   --------      ------        ---------     ---------
          Total comprehensive loss......                                                      (104,216)
     Issuance of 375,270 shares of
          Common Stock pursuant to stock
            option plans................      4       2,821          --               --         2,825
                                          ------   --------      ------        ---------     ---------
Balance, December 31, 1996..............  1,026     124,522         104         (307,827)     (182,175)
     Net loss...........................     --          --          --         (156,947)     (156,947)
     Foreign currency translation
       adjustments......................     --          --         804               --           804
                                          ------   --------      ------        ---------     ---------
          Total comprehensive loss......                                                      (156,143)
     Issuance of 38,838 shares of
          Common Stock pursuant to stock
            option and compensation
            plans.......................      1         386          --               --           387
                                          ------   --------      ------        ---------     ---------
Balance, December 31, 1997..............  1,027     124,908         908         (464,774)     (337,931)
     Net loss...........................     --          --          --         (162,009)     (162,009)
     Foreign currency translation
       adjustments......................     --          --       1,470               --         1,470
                                          ------   --------      ------        ---------     ---------
          Total comprehensive loss......                                                      (160,539)
     Issuance of 980,639 shares of
          Common Stock pursuant to stock
            option and compensation
            plans.......................      9       8,042          --               --         8,051
                                          ------   --------      ------        ---------     ---------
Balance, December 31, 1998..............  $1,036   $132,950      $2,378        $(626,783)    $(490,419)
                                          ======   ========      ======        =========     =========
</TABLE>

                                      F-34
<PAGE>   239

                              PAGING NETWORK, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES

     Paging Network, Inc. (the Company) is a provider of wireless messaging and
information delivery services. The Company provides service in all 50 states,
the District of Columbia, the U.S. Virgin Islands, Puerto Rico, Canada, and
Spain, including service in all of the largest 100 markets (in population) in
the United States, and owns a minority interest in a wireless messaging company
in Brazil. The consolidated financial statements include the accounts of all of
its wholly and majority-owned subsidiaries. Effective January 1, 1998, the
Company began consolidating the results of its Spanish subsidiary, which had
previously been accounted for under the equity method of accounting. All
intercompany transactions have been eliminated.

     Use of estimates -- The preparation of financial statements in conformity
with generally accepted accounting principles requires management to make
estimates and assumptions that affect the amounts reported in the financial
statements and accompanying notes. Actual results could differ from those
estimates.

     Inventories -- Inventories consist of subscriber devices which are held
specifically for resale. Inventories are stated at the lower of cost or market,
with cost determined on a first-in, first-out basis.

     Property, equipment, and leasehold improvements -- Property, equipment, and
leasehold improvements are liquidation at cost, less accumulated depreciation.
Expenditures for maintenance are charged to expense as incurred. Upon retirement
of units of equipment, the costs of units retired and the related accumulated
depreciation amounts are removed from the accounts. Depreciation is computed
using the straight-line method based on the following estimated useful lives:

<TABLE>
<S>                                                           <C>
Machinery and equipment.....................................  3 to 7 years(1)
Subscriber devices..........................................       3 years(2)
Furniture and fixtures......................................       7 years(1)
Leasehold improvements......................................       5 years(1)(3)
Building and building improvements..........................      20 years
</TABLE>

- ---------------
(1) Certain assets written down as a result of the Company's restructuring
    described in Note 2 are being depreciated to a common retirement date of
    November 30, 1999.

(2) Effective January 1, 1997, the Company changed the estimated useful life of
    subscriber devices from 4 years to 3 years, with estimated residual value
    ranging up to $20 (see Note 3).

(3) Or term of lease if shorter.

     The Company reserves for subscriber devices which it estimates to be
non-recoverable.

     Other non-current assets -- Other non-current assets are liquidation at
cost, less accumulated amortization. Amortization is computed using the
straight-line method based upon the following estimated useful lives:

<TABLE>
<S>                                                       <C>
Licenses and frequencies................................              40 years
Goodwill................................................              20 years
Other intangible assets.................................  18 months to 3 years
Other non-current assets................................  10 years to 12 years
</TABLE>

     Deferred revenues and customer deposits -- Deferred revenues represent
billing to customers in advance for services not yet performed and are
recognized as revenue in the month the service is provided. Deposits are
received from some customers at the time a service agreement is signed and are
recognized as a liability of the Company until such time as the deposits are
applied, generally against the customer's final bill.

                                      F-35
<PAGE>   240
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     Revenue recognition -- Services, rent and maintenance revenues are
recognized in the month the related services are performed. Product sales are
recognized upon delivery of product to the customer.

     Employee stock options -- The Company has elected to follow Accounting
Principles Board Opinion No. 25, "Accounting for Stock Issued to Employees" (APB
25) and related interpretations in accounting for its employee stock option
plans. Under APB 25, because the exercise price of the Company's employee stock
options has historically equalled the market price of the underlying stock on
the date of grant, no compensation expense has been recognized.

     Advertising costs -- The Company expenses the costs of advertising as
incurred. Advertising expense for the years ended December 31, 1996, 1997, and
1998, was $12.5 million, $21.9 million, and $19.1 million, respectively.

     Capitalization of internally developed software -- In March 1998, the
Accounting Standards Executive Committee of the American Institute of Certified
Public Accountants issued Statement of Position 98-1, "Accounting for the Costs
of Computer Software Developed For or Obtained for Internal Use" (SOP 98-1). SOP
98-1 requires the capitalization of certain costs of developing or acquiring
computer software for internal use. The Company adopted the provisions of SOP
98-1 effective January 1, 1999; however, the adoption is not expected to have a
material impact on the Company's results of operations or financial position as
the Company's current policy for accounting for the costs of developing or
acquiring computer software for internal use is generally consistent with the
provisions of SOP 98-1.

     Comprehensive income (loss) -- As of January 1, 1998, the Company adopted
Statement of Financial Accounting Standards No. 130, "Reporting Comprehensive
Income" (SFAS 130), which establishes new rules for the reporting and display of
comprehensive income (loss) and its components. SFAS 130 requires certain items,
which prior to adoption were reported separately in shareowners' deficit, to be
included in other comprehensive income (loss). Other comprehensive income as of
December 31, 1996, 1997, and 1998, consists solely of foreign currency
translation adjustments. The adoption of SFAS 130 had no impact on the Company's
net loss or shareowners' deficit.

     Reclassifications -- Certain 1996 and 1997 amounts have been reclassified
to conform with the 1998 presentation.

2.  RESTRUCTURING CHARGE

     On February 8, 1998, the Company's Board of Directors approved a
restructuring of the Company's domestic operations (the Restructuring). As part
of the Restructuring, the Company is reorganizing its operations to expand its
sales organization, eliminate local and redundant administrative operations, and
consolidate certain key support functions. The Company expects to eliminate
approximately 1,600 positions, net of positions added, through the consolidation
of redundant administrative operations and certain key support functions located
in offices throughout the country into centralized facilities (the Centers of
Excellence). As a result of the Restructuring, the Company recorded a charge of
$74.0 million, or $0.72 per share (basic and diluted), during the quarter ended
March 31, 1998. The components of the charge included (in thousands):

<TABLE>
<S>                                                           <C>
Write-down of property and equipment........................  $38,900
Lease obligations and terminations..........................   18,900
Severance and related benefits..............................   12,700
Other                                                           3,500
                                                              -------
          Total restructuring charge........................  $74,000
                                                              =======
</TABLE>

     The write-down of property and equipment related to a non-cash charge to
reduce the carrying amount of certain machinery and equipment, furniture and
fixtures, and leasehold improvements, that the

                                      F-36
<PAGE>   241
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

Company will not continue to utilize following the Restructuring, to their
estimated net realizable value as of the date such assets are projected to be
disposed of or abandoned by the Company, allowing for the recognition of normal
depreciation expense on such assets through their projected disposal date. The
net realizable value of these assets was determined based on management
estimates, which considered such factors as the nature and age of the assets to
be disposed of, the timing of the assets' disposal, and the method and potential
costs of the disposal. Such estimates are subject to change.

     The provision for lease obligations and terminations related primarily to
future lease commitments on local and regional office facilities that will be
closed as part of the Restructuring. The charge represents future lease
obligations, net of projected sublease income, on such leases past the dates the
offices will be closed by the Company, or, for certain leases, the cost of
terminating the leases prior to their scheduled expiration. Projected sublease
income was based on management estimates, which are subject to change. Cash
payments on the leases and lease terminations will occur over the remaining
lease terms, the majority of which expire prior to 2003.

     Through the elimination of certain local and regional administrative
operations and the consolidation of certain support functions, the Company
expects to eliminate approximately 1,600 net positions, the majority of which
are non-sales related positions in local and regional offices. As a result of
eliminating these positions, the Company will involuntarily terminate an
estimated 1,950 employees. The majority of the severance and benefits costs to
be paid by the Company will be paid during 1999.

     During the fourth quarter of 1998, the Company identified additional
furniture, fixtures, and equipment that will not be utilized following the
Restructuring, resulting in an additional non-cash charge of $2.6 million. This
charge was offset by reductions in the provisions for lease obligations and
terminations and severance costs as a result of refinements to the Company's
schedule for local and regional office closures. Also as a result of the
refinements to the office closing schedule, the Company adjusted, effective
October 1, 1998, the depreciable lives of certain of the assets written down in
the first quarter of 1998, resulting in a decrease in depreciation expense of
approximately $3.3 million for the fourth quarter of 1998.

     The Company's restructuring activity through December 31, 1998 is as
follows (in thousands):

<TABLE>
<CAPTION>
                                                                   UTILIZATION OF RESERVE
                                         INITIAL    ADJUSTMENTS    ----------------------    REMAINING
                                         CHARGE      TO CHARGE       CASH       NON-CASH      RESERVE
                                         -------    -----------    --------    ----------    ---------
<S>                                      <C>        <C>            <C>         <C>           <C>
Fixed assets impairments...............  $38,900      $2,600        $   --       $41,500      $    --
Lease obligation costs.................   18,900      (1,300)          683            --       16,917
Severance costs........................   12,700      (1,300)        1,296            --       10,104
Other..................................    3,500          --            --         3,500           --
                                         -------      ------        ------       -------      -------
                                         $74,000      $   --        $1,979       $45,000      $27,021
                                         =======      ======        ======       =======      =======
</TABLE>

3.  PROPERTY, EQUIPMENT, AND LEASEHOLD IMPROVEMENTS

     The cost of property, equipment, and leasehold improvements consisted of
the following:

<TABLE>
<CAPTION>
                                                         1997          1998
            (IN THOUSANDS) DECEMBER 31,               ----------    ----------
<S>                                                   <C>           <C>
Machinery and equipment.............................  $  761,208    $  871,870
Subscriber devices..................................     506,026       497,238
Furniture and fixtures..............................      63,772        59,996
Leasehold improvements..............................      36,704        20,609
Land, buildings, and building improvements..........      19,850         3,157
                                                      ----------    ----------
          Total cost................................  $1,387,560    $1,452,870
                                                      ==========    ==========
</TABLE>

     The Company does not manufacture any of the subscriber devices or related
transmitting and computerized terminal equipment used in the Company's
operations. The Company purchases its

                                      F-37
<PAGE>   242
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

subscriber devices from multiple competing sources. The Company anticipates that
subscriber devices will continue to be available for purchase from multiple
sources, consistent with normal manufacturing and delivery lead times.

     Effective January 1, 1997, the Company shortened the depreciable lives of
its subscriber devices from four to three years, and revised the related
residual values. This change increased net loss for the year ended December 31,
1997 by $16.5 million and net loss per share by $0.16.

4.  OTHER NON-CURRENT ASSETS

     The cost of other non-current assets consisted of the following:

<TABLE>
<CAPTION>
                                                           1997        1998
              (IN THOUSANDS) DECEMBER 31,                --------    --------
<S>                                                      <C>         <C>
Licenses and frequencies...............................  $452,551    $473,211
Goodwill...............................................    49,246      50,495
Restricted cash invested in money market instruments,
  at fair value........................................    33,461      33,461
Other intangible assets................................    59,460      13,920
Deposits for purchase of subscriber devices............    13,493          --
Other non-current assets...............................    51,450      58,285
                                                         --------    --------
          Total cost...................................  $659,661    $629,372
                                                         ========    ========
</TABLE>

     Licenses and frequencies consist of amounts paid in conjunction with the
purchase of three nationwide narrowband personal communications services (PCS)
frequencies at a Federal Communications Commission (FCC) auction held in 1994,
amounts paid in conjunction with the purchase of blocks of 2-way 900 MHz
specialized mobile radio (SMR) major trading area based licenses, amounts paid
to purchase exclusive rights to certain of the SMR frequencies from incumbent
operators, and amounts paid to secure other licenses.

     At December 31, 1998, the carrying value of the Company's net assets
related to its Spanish subsidiary was $17.7 million, including goodwill of $11.5
million. The Company is currently evaluating certain alternatives with respect
to this subsidiary. It is reasonably possible, depending upon the outcome of
this evaluation and other factors, that the Company's estimate that it will
recover the carrying value of the net assets of its Spanish subsidiary will
change in the near term. As a result, a provision for the impairment of such
assets may be recorded during the year ending December 31, 1999.

     In April 1998, the Accounting Standards Executive Committee of the American
Institute of Certified Public Accountants issued Statement of Position 98-5
"Reporting on the Costs of Start-Up Activities" (SOP 98-5), effective for years
beginning after December 15, 1998. SOP 98-5 requires the expensing of all
start-up costs as incurred as well as the writing off of the remaining
unamortized balance of capitalized start-up costs at the date of adoption of SOP
98-5. The Company adopted the provisions of SOP 98-5 effective January 1, 1999
and recorded a charge of $37.0 million as the cumulative effect of a change in
accounting principle to write-off all unamortized start-up costs as of January
1, 1999.

                                      F-38
<PAGE>   243
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

5.  LONG-TERM OBLIGATIONS

     Long-term obligations consisted of the following:

<TABLE>
<CAPTION>
                                                       1997                          1998
                                            --------------------------    --------------------------
                                            (CARRYING                     (CARRYING
       (IN THOUSANDS) DECEMBER 31,            VALUE)      (FAIR VALUE)      VALUE)      (FAIR VALUE)
<S>                                         <C>           <C>             <C>           <C>
Borrowings under Credit Agreement.........  $  539,000     $  539,000     $  565,000     $  565,000
10% Senior Subordinated Notes due October
  15, 2008................................     500,000        517,900        500,000        477,473
10.125% Senior Subordinated Notes due
  August 1, 2007..........................     400,000        418,080        400,000        382,964
8.875% Senior Subordinated Notes due
  February 1, 2006........................     300,000        295,770        300,000        292,484
Other.....................................      40,491         40,491         50,137         50,137
                                            ----------     ----------     ----------     ----------
          Total long-term obligations.....  $1,779,491     $1,811,241     $1,815,137     $1,768,058
                                            ==========     ==========     ==========     ==========
</TABLE>

     Under the Company's $1.0 billion domestic revolving credit agreement (the
Credit Agreement), the Company is able to borrow, provided it meets certain
financial covenants, the lesser of $1.0 billion or an amount based primarily
upon the Company's domestic earnings before interest, income taxes,
depreciation, and amortization (EBITDA) for the most recent fiscal quarter. As
of December 31, 1998, the Company had $565.0 million of borrowings outstanding
under the Credit Agreement, and $65.8 million was available for additional
borrowings as of that date based on the Company's domestic EBITDA for the fourth
quarter of 1998. The availability of additional borrowings in periods subsequent
to December 31, 1998 is based upon the Company's domestic EBITDA for such future
periods. The Company's maximum borrowings under the Credit Agreement are
permanently reduced beginning on June 30, 2001, by the following amounts:
2001 -- $150.0 million; 2002 -- $200.0 million; 2003 -- $250.0 million; and
2004 -- $400.0 million. The Company's Credit Agreement expires on December 31,
2004.

     Under the Credit Agreement, the Company may designate all or a portion of
outstanding borrowings to be either a Base Rate Loan or a loan based on the
London Interbank Offered Rate (LIBOR). As of December 31, 1998, the Company had
designated $552.0 million of borrowings as LIBOR loans, which bear interest at a
rate equal to LIBOR plus a spread of 1.50%, and $13.0 million of borrowings as a
Base Rate Loan, which bears interest at a rate equal to the prime rate plus a
spread of 0.50%, based on the Company's total leverage ratio as defined. The
interest rates for the $552.0 million of LIBOR loans as of December 31, 1998
ranged from 6.47% to 6.81%. The interest rate for the $13.0 million Base Rate
Loan as of December 31, 1998 was 8.25%.

     The Credit Agreement prohibits the Company from paying cash dividends or
other cash distributions to shareowners. The Credit Agreement also prohibits the
Company from paying more than a total of $2.0 million in connection with the
purchase of Common Stock owned by employees whose employment with the Company is
terminated. The Credit Agreement contains other covenants that, among other
things, limit the ability of the Company and its subsidiaries to incur
indebtedness, engage in transactions with affiliates, dispose of assets, and
engage in mergers, consolidations, and other acquisitions. Amounts owing under
the Credit Agreement are secured by a security interest in substantially all of
the Company's assets, the assets of the Company's subsidiaries, and the capital
stock of the subsidiaries of the Company.

     The two credit agreements of the Company's Canadian subsidiaries provide
for total borrowings of approximately $70 million. As of December 31, 1998,
approximately $45.1 million of borrowings were outstanding under the credit
facilities. Such borrowings were collateralized by $33.5 million of restricted
cash included in other non-current assets. Additional borrowings are available
under these facilities, provided such borrowings are either collaterized or
certain financial conditions are met. As of December 31, 1998, the Company's
Canadian subsidiaries are in compliance with all financial covenants of

                                      F-39
<PAGE>   244
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

their separate credit agreements; however, the Company has entered into
negotiations with its lenders to modify certain covenants that the Company
believes may not be satisfied during the second and third quarters of 1999.
Although the Company anticipates that these negotiations will be successful and
will not result in a material change in borrowing capacity or interest expense,
no assurance can be made that such result will be attained. Maximum borrowings
that may be outstanding under the credit facilities are permanently reduced
beginning on March 31, 2001, by the following amounts: 2001 -- $7 million;
2002 -- $21 million; 2003 -- $21 million; and 2004 -- $21 million. Both credit
agreements expire on December 31, 2004.

     The 8.875% Senior Subordinated Notes (8.875% Notes), the 10.125% Senior
Subordinated Notes (10.125% Notes), and the 10% Senior Subordinated Notes (10%
Notes) are redeemable on or after February 1, 1999; August 1, 2000; and October
15, 2001; respectively, at the option of the Company, in whole or in part from
time to time, at certain prices declining annually to 100 percent of the
principal amount on or after February 1, 2002; August 1, 2003; and October 15,
2004; respectively, plus accrued interest. The 8.875% Notes, the 10.125% Notes,
and the 10% Notes are subordinated in right of payment to all senior debt, and
contain various covenants that, among other things, limit the ability of the
Company and its subsidiaries to incur indebtedness, pay dividends, engage in
transactions with affiliates, sell assets, and engage in mergers,
consolidations, and other acquisitions. The fair values of the 8.875% Notes, the
10.125% Notes, and the 10% Notes were based on quoted market prices and
discounted cash flow analyses.

     On May 14, 1997, the Company redeemed all $200.0 million of its outstanding
11.75% Senior Subordinated Notes (11.75% Notes), utilizing funds borrowed under
the Company's Credit Agreement. The Company recorded an extraordinary loss of
$15.5 million in the second quarter of 1997 on the early retirement of the
11.75% Notes. The extraordinary loss was comprised of the redemption premium of
$11.8 million and the write-off of unamortized issuance costs of $3.7 million.

6.  INCOME TAXES

     For the years ended December 31, 1996, 1997, and 1998, the Company had no
provision or benefit for income taxes because the deferred benefit from the
operating losses was offset by an increase in the valuation allowance of $36.9
million, $56.4 million, and $57.6 million, respectively. Significant components
of the Company's deferred tax assets and liabilities are as follows:

<TABLE>
<CAPTION>
                                                           1997        1998
              (IN THOUSANDS) DECEMBER 31,                --------    --------
<S>                                                      <C>         <C>
Deferred tax assets:
     Net operating loss carryforwards..................  $167,330    $197,983
     Deferred revenue..................................     4,394       5,982
     Bad debt reserve..................................     2,561       3,768
     Other tax credit carryforwards....................       691         679
     Other.............................................     6,445      28,482
                                                         --------    --------
          Total deferred tax assets....................   181,421     236,894
     Valuation allowance...............................  (143,897)   (201,496)
                                                         --------    --------
          Net deferred tax assets......................    37,524      35,398
Deferred tax liabilities:
     Depreciation......................................   (29,232)    (23,450)
     Amortization......................................    (8,292)    (11,948)
                                                         --------    --------
          Total deferred tax liabilities...............   (37,524)    (35,398)
                                                         --------    --------
                                                         $     --    $     --
                                                         ========    ========
</TABLE>

                                      F-40
<PAGE>   245
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     As of December 31, 1998, the Company has net operating loss carryforwards
of approximately $508 million that expire in years 1999 through 2018. Of such
amounts, $5.0 million expire in 1999 and $5.1 million expire in 2001. Loss
before income taxes attributable to the Company's foreign operations was $13.1
million, $13.9 million, and $11.8 million for the years ended December 31, 1996,
1997, and 1998.

7.  STOCK OPTIONS

     The 1982 Incentive Stock Option Plan, as amended (1982 Plan), for officers
and key employees of the Company provides for the granting of stock options
intended to qualify as Incentive Stock Options (ISOs) to purchase Common Stock
at not less than 100% of the fair market value on the date the option is
granted, as determined by the Board of Directors. No further options may be
granted under the 1982 Plan. As of December 31, 1998, options for 297,111 shares
were exercisable under the 1982 Plan. All options outstanding and exercisable
under the 1982 Plan are fully vested.

     Options granted were exercisable immediately, or in installments as the
Board of Directors determined at the time it granted such options, and have a
duration of ten years from the date of grant. Any stock issued is subject to
repurchase at the option of the Company, which occurs at the exercise price for
the unvested portion of the shares issued and at fair market value, as defined
or allowed in the Stock Option Agreement, for the vested portion. Such options
vest ratably over a five-year period from the date they first become
exercisable. However, in the event of a change in ownership control of the
Company, all options vest immediately.

     The 1991 Stock Option Plan (1991 Plan) for officers and key employees of
the Company provides for the granting of ISOs and non-statutory options to
purchase Common Stock at not less than 100% of the fair market value on the date
the options are granted. The 1991 Plan is administered by the Compensation and
Management Development Committee of the Board of Directors (the Committee).
Approximately 4.7 million shares remained available for grant under the 1991
Plan as of December 31, 1998. A total of 2,645,400 shares were vested and
exercisable under the 1991 Plan as of December 31, 1998. Options granted under
the 1991 Plan are non-transferable except by the laws of descent and
distribution and are exercisable upon vesting, which occurs in installments, as
the Board of Directors or the Committee may determine at the time it grants such
options.

     On May 21, 1998, the Company's shareowners approved an amendment to its
1991 Plan to broaden the group of employees eligible to receive stock options
under such plan to include all employees of the Company and its subsidiaries. On
May 22, 1998, the Company granted approximately 2.1 million of options under the
1991 Plan to approximately 2,700 employees at an exercise price of $13.94 per
share, which represented the market price of the Company's Common Stock at the
date of grant. Grants of stock options to eligible new employees are made
following the completion of three months of service.

     The Amended and Restated 1992 Directors Compensation Plan (Directors'
Plan), for non-employee Directors of the Company, provides for the granting of
non-statutory options to purchase Common Stock at not less than 100% of the fair
market value on the date the options are granted. The Directors' Plan is
administered by the Committee. The total number of shares of Common Stock with
respect to which options may be granted under the Directors' Plan may not exceed
750,000. Approximately 165,000 shares remain available for grant under the
Directors' Plan as of December 31, 1998. A total of 261,000 shares were vested
and exercisable as of December 31, 1998. Options granted under the Directors'
Plan are non-transferable except by the laws of descent and distribution and are
exercisable upon vesting, which occurs in installments, as the Board of
Directors or the Committee may determine at the time it grants such options.

     With respect to the 1991 Plan and the Directors' Plan, notwithstanding the
above, ten business days before a merger or a change in the ownership control of
the Company or a sale of substantially all the

                                      F-41
<PAGE>   246
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

assets of the Company, all options issued vest immediately and become
exercisable in full; upon a merger or a change in ownership control of the
Company or the sale of substantially all the assets of the Company, all options
issued under the 1991 Plan and Directors' Plan which have not been exercised
terminate.

     On June 12, 1997, the Company offered an election to its employees with
options granted during 1995 and 1996 under the 1991 Plan to cancel such options
and accept a lesser number of new options at a lower exercise price, with the
vesting dates being restarted with the new grant dates. As a result of the
election by certain of its employees, the Company canceled 2.9 million of
options with exercise prices ranging from $13.69 to $26.50 and granted
approximately 1.1 million of options to the same optionees with an exercise
price of $8.25 per share.

     Information concerning options as of December 31, 1996, 1997, and 1998 is
as follows:

<TABLE>
<CAPTION>
                                                   1996           1997           1998
                                               ------------   ------------   ------------
<S>                                            <C>            <C>            <C>
Outstanding at January 1.....................     4,664,735      5,968,605      5,687,335
     Granted.................................     2,307,100      3,435,873      5,066,000
     Canceled................................      (627,960)    (3,705,609)    (1,241,982)
     Exercised...............................      (375,270)       (11,534)      (931,785)
                                               ------------   ------------   ------------
Outstanding at December 31...................     5,968,605      5,687,335      8,579,568
                                               ============   ============   ============
Exercisable at December 31...................     1,920,085      2,450,795      3,253,511
                                               ============   ============   ============
Option price range-options outstanding.......  $2.67-$26.50   $2.67-$25.50   $2.67-$25.50
Option price range-options exercised.........  $2.73-$14.38   $2.73-$ 9.25   $2.67-$14.38
</TABLE>

     Weighted-average exercise prices are as follows:

<TABLE>
<CAPTION>
                                                               1996     1997    1998
                                                              ------   ------   -----
<S>                                                           <C>      <C>      <C>
Outstanding at January 1....................................  $12.22   $15.90   $9.47
     Granted................................................   22.33     9.54   12.59
     Canceled...............................................   17.19    19.89   12.79
     Exercised..............................................    7.53     7.49    8.16
Outstanding at December 31..................................   15.90     9.47   10.98
Exercisable at December 31..................................    9.65     9.12    9.85
</TABLE>

     Certain information is being presented based on a range of exercise prices
as of December 31, 1998, as follows:

<TABLE>
<S>                                           <C>            <C>             <C>
                                              $ 2.67-$8.69   $9.06-$13.38    $13.63-$25.50
                                              ------------   ------------    -------------
Number of shares outstanding................     2,946,560      2,877,468        2,755,540
Weighted-average exercise price.............  $       7.18   $      11.97    $       14.00
Weighted-average remaining contractual
  life......................................          7.06           8.28             9.11
Number of shares exercisable................     1,622,223        960,468          670,820
Weighted-average exercise price of shares
  exercisable...............................  $       7.02   $      11.69    $       14.07
</TABLE>

     The Company adopted the pro forma disclosure provisions of the Statement of
Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation" (SFAS 123) in 1996. As required by SFAS 123, pro forma information
regarding net loss and net loss per share has been determined as if the Company
had accounted for employee stock options and stock-based awards granted
subsequent to December 31, 1994 under the fair value method provided for under
SFAS 123. The weighted-average fair value of stock options granted during 1996,
1997, and 1998 was $13.58, $5.98, and $7.21, respectively. The fair value for
the stock options granted to officers and key employees of the Company after
January 1,

                                      F-42
<PAGE>   247
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

1995 was estimated at the date of the grant using the Black-Scholes option
pricing model with the following assumptions: risk-free interest ranging from
5.54% to 6.83% for 1996, ranging from 5.46% to 6.89% for 1997, and ranging from
4.09% to 5.72% for 1998; a dividend yield of 0%; volatility factors of the
expected market price of the Company's Common Stock ranging from 53.2% to 54.4%
for 1996, ranging from 54.4% to 57.6% for 1997, and ranging from 56.8% to 60.0%
for 1998; and a weighted average expected life of each option ranging from 5.5
years to 6.7 years for 1996, 1997, and 1998.

     For purposes of the pro forma disclosures, the estimated fair market value
of the options and stock-based awards is amortized to expense over the vesting
period. The Company's pro forma information is as follows (in thousands, except
for net loss per common share information):

<TABLE>
<CAPTION>
                                                         1996        1997        1998
                                                       ---------   ---------   ---------
<S>                                   <C>              <C>         <C>         <C>
Net loss                              As reported      $(104,320)  $(156,947)  $(162,009)
                                        Pro forma      $(110,533)  $(172,884)  $(179,834)
Net loss per common share (basic and
  diluted)                            As reported      $   (1.02)  $   (1.53)  $   (1.57)
                                        Pro forma      $   (1.08)  $   (1.68)  $   (1.74)
</TABLE>

     Because SFAS 123 is applicable only to options and stock-based awards
granted subsequent to December 31, 1994, its pro forma effect will not be fully
reflected until 2001.

8.  COMMITMENTS

     The Company has operating leases for office and transmitting sites with
lease terms ranging from a month to approximately ten years. There are no
significant renewal or purchase options. Total rent expense for 1996, 1997, and
1998 was approximately $60.7 million, $69.5 million, and $80.5 million,
respectively.

     The following is a schedule by year of future minimum rental payments
required under operating leases that have remaining noncancelable lease terms in
excess of one year as of December 31, 1998.

<TABLE>
<CAPTION>
          YEAR ENDING DECEMBER 31: (IN THOUSANDS)
          ---------------------------------------
<S>                                                           <C>
1999........................................................  $24,225
          2000..............................................   18,680
          2001..............................................   13,004
          2002..............................................    8,019
          2003..............................................    3,671
          Later years.......................................    4,941
                                                              -------
                    Total minimum payments required.........  $72,540
                                                              =======
</TABLE>

     As part of the Company's Restructuring, certain leases will be terminated
prior to their scheduled expiration, generally upon the payment of a termination
fee, and certain office space and facilities will be subleased through the
expiration of the related leases, generally for amounts less than the Company's
lease commitments for such space. The aforementioned leases are included in the
table above based on the term of the lease without consideration of any
potential sublease income.

9.  CONTINGENCIES

     The Company is involved in various lawsuits arising in the normal course of
business. In management's opinion, the ultimate outcome of these lawsuits will
not have a material adverse effect on the Company's business, financial
position, or results of operations.

                                      F-43
<PAGE>   248
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

10.  COMMON STOCK AND NET LOSS PER SHARE

     Net loss per share amounts are computed based on the weighted average
number of common shares outstanding. The number of shares used to compute per
share amounts for the years ended December 31, 1996, 1997, and 1998, was 102.5
million, 102.6 million, and 103.4 million, respectively. The average number of
options to purchase shares of the Company's Common Stock during the years ended
December 31, 1996, 1997, and 1998, were 5.6 million, 6.0 million, and 7.8
million, respectively, at exercise prices ranging from $2.67 per share to $25.50
per share. These stock options were not included in the computation of diluted
earnings per share because the effect of assuming their exercise would have been
antidilutive.

     The Company has 275.0 million of authorized shares, of which 250.0 million
are Common Stock and 25.0 million are preferred stock. As of December 31, 1998,
approximately 15.8 million shares of Common Stock were reserved for the issuance
of shares under the Company's stock option and other plans. As of December 31,
1998, there were no preferred shares issued or outstanding.

     On May 23, 1996, the Company's shareowners approved an employee stock
purchase plan of up to 2.0 million shares of the Company's Common Stock. Under
the employee stock purchase plan, an employee may elect to purchase shares of
the Company's Common Stock at the end of a predetermined period at a price equal
to 85% of the fair market value of the Company's Common Stock at the beginning
or end of such period, whichever is lower. The Company implemented two-year
employee stock purchase plans on January 1, 1997 and 1998, and a one-year plan
on January 1, 1999.

11.  NON-RECURRING CHARGES

     During the year ended December 31, 1997, the Company recorded a provision
of $12.6 million to write-down certain subscriber devices to their net
realizable value. During the year ended December 31, 1996, the Company recorded
a provision of $22.5 million to write-off certain subscriber devices deemed to
be unrecoverable that had been distributed through a national marketing
affiliate to customers who later discontinued service.

12.  STATEMENT OF CASH FLOWS INFORMATION

     Cash and cash equivalents include highly liquid debt instruments with an
original maturity of three months or less. As of December 31, 1998, cash
equivalents also include investments in money market instruments, which are
carried at fair market value. Cash payments made for interest for the years
ended December 31, 1996, 1997, and 1998 were approximately $115.5 million,
$143.5 million, and $136.2 million, respectively, net of $15.9 million and $21.9
million, respectively, of interest capitalized during the years ended December
31, 1997 and 1998. During the year ended December 31, 1998, the Company utilized
$13.5 million of deposits made in 1997 for the purchase of subscriber devices.
There were no significant federal or state income taxes paid or refunded for the
years ended December 31, 1996, 1997, and 1998.

13.  EMPLOYEE BENEFIT PLANS

     The Company has adopted a plan to provide retirement benefits under the
provisions of Section 401(k) of the Internal Revenue Code (the Code) for all
employees who have completed a specified term of service. Effective January 1,
1996, Company contributions equal 50% of employee contributions up to a maximum
of 6% of the employee's compensation. Employees may elect to contribute up to
15% of their compensation on a pre-tax basis, not to exceed the maximum amount
allowed as determined by the Code. The Company's contributions aggregated
approximately $1.9 million in 1996, $2.2 million in 1997, and $2.8 million in
1998.

                                      F-44
<PAGE>   249
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

14.  STOCK PURCHASE RIGHTS

     In September 1994, the Board of Directors of the Company adopted a Stock
Purchase Rights Plan and declared a distribution of one common share purchase
right for each outstanding share of the Company's Common Stock. As of September
28, 1994, certificates representing shares of the Company's Common Stock also
represent ownership of one common share purchase right. In January 1999, the
Board of Directors of the Company amended the Rights Plan to eliminate certain
provisions held to be unenforceable under Delaware law.

     Generally, the rights will become exercisable only if a person or group (I)
acquires 20% or more of the Company's Common Stock or (ii) announces a tender
offer that would result in ownership of 20% or more of the Company's Common
Stock or (iii) is declared to be an "Adverse Person" by the Board of Directors.
Adverse Person includes any person or group who owns at least 10% of the
Company's Common Stock and attempts an action that would adversely impact the
Company.

     Once a person or group has acquired 20% or more of the outstanding Common
Stock of the Company, each right may entitle its holder (other than the 20%
person or group) to purchase, at an exercise price of $150, shares of Common
Stock of the Company (or of any company that acquires the Company) at a price
equal to 50% of their current market price. Under certain circumstances, the
Board of Directors may exchange the rights for Common Stock (or equivalent
securities) on a one-for-one basis.

     Until declaration of an Adverse Person, or ten (10) days after public
announcement that any person or group has acquired 20% or more of the Common
Stock of the Company, the rights are redeemable at the option of the Board of
Directors. Thereafter, they may be redeemed by the Board of Directors in
connection with certain acquisitions not involving any acquiring person or
Adverse Person or in certain circumstances following a disposition of shares by
the acquiring person or Adverse Person. The redemption price is $0.01 per right.
The rights will expire on September 27, 2004, unless redeemed prior to that
date.

15.  SEGMENT INFORMATION

     In June 1997, the Financial Accounting Standards Board (FASB) issued
Statement of Financial Accounting Standards No. 131, "Disclosures about Segments
of an Enterprise and Related Information" (SFAS 131). The Company has adopted
SFAS 131 in its 1998 annual financial statements. SFAS 131 requires that a
public company report annual and interim financial and descriptive information
about its reportable operating segments pursuant to criteria that differ from
current accounting practice. Operating segments, as defined, are components of
an enterprise about which separate financial information is available that is
evaluated regularly by the chief operating decision-maker in deciding how to
allocate resources and in assessing performance.

     The Company has determined that it has two reportable segments, core
operations and advanced messaging operations. The Company's basis for the
segments relates to the types of products and services each segment provides.
The core operating segment includes the traditional display and alphanumeric
services, which are basic one-way services, and 1  1/2-way paging services. The
advanced messaging operating segment includes the new 2-way wireless messaging
services, advanced wireless integration products, consumer content, VoiceNow
service, Iridium WorldPage, and other future advanced messaging products.

                                      F-45
<PAGE>   250
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     The following table presents certain information related to the Company's
business segments as of December 31, 1996, 1997, and 1998 or for the years ended
December 31, 1996, 1997, and 1998.

<TABLE>
<CAPTION>
                                                          1996            1997            1998
                   (IN THOUSANDS)                      ----------      ----------      ----------
<S>                                                    <C>             <C>             <C>
Net Revenues (1):
     Core(2).........................................  $  705,840      $  839,217      $  966,204
     Advanced Messaging..............................          --             272           2,151
                                                       ----------      ----------      ----------
                                                       $  705,840      $  839,489      $  968,355
                                                       ==========      ==========      ==========
Depreciation and amortization:
     Core(2).........................................  $  213,440      $  276,590      $  266,319
     Advanced Messaging..............................          --          12,852          14,940
                                                       ----------      ----------      ----------
                                                       $  213,440      $  289,442      $  281,259
                                                       ==========      ==========      ==========
Operating income (loss):
     Core(2).........................................  $   20,897(3)   $   31,399(4)   $   17,406(5)
     Advanced Messaging..............................          --         (23,891)        (39,726)(6)
                                                       ----------      ----------      ----------
                                                       $   20,897      $    7,508      $  (22,320)
                                                       ==========      ==========      ==========
Adjusted EBITDA(7):
     Core(2).........................................  $  256,837      $  320,589      $  357,725
     Advanced Messaging..............................          --         (11,039)        (24,786)
                                                       ----------      ----------      ----------
                                                       $  256,837      $  309,550      $  332,939
                                                       ==========      ==========      ==========
Capital expenditures:
     Core(2).........................................  $  390,685      $  224,459      $  199,610
     Advanced Messaging..............................      46,703         103,906          97,431
                                                       ----------      ----------      ----------
                                                       $  437,388      $  328,365      $  297,041
                                                       ==========      ==========      ==========
Net interest expense(8):
     Core(2).........................................  $   96,365      $   90,458      $   74,729
     Advanced Messaging..............................      27,970          57,233          66,963
                                                       ----------      ----------      ----------
                                                       $  124,335      $  147,691      $  141,692
                                                       ==========      ==========      ==========
Free Cash Flow(9):
     Core(2).........................................  $ (230,213)     $    5,672      $   83,386
     Advanced Messaging..............................     (74,673)       (172,178)       (189,180)
                                                       ----------      ----------      ----------
                                                       $ (304,886)     $ (166,506)     $ (105,794)
                                                       ==========      ==========      ==========
Total assets:
     Core(2).........................................  $1,077,772      $1,045,761      $  932,889
     Advanced Messaging..............................     361,841         551,472         648,355
                                                       ----------      ----------      ----------
                                                       $1,439,613      $1,597,233      $1,581,244
                                                       ==========      ==========      ==========
</TABLE>

- ---------------

(1) Net Revenues are revenues from services, rent, and maintenance plus product
    sales less the cost of products sold.

(2) The international operations of the Company currently consist entirely of
    core services and accordingly are included in the Company's core business
    segment.

(3) Operating income for the core business segment for 1996 includes a $22.5
    million non-recurring charge related to the write-off of certain subscriber
    devices deemed to be unrecoverable that had been distributed through a
    national marketing affiliate to customers who later discontinued service.
    See Note 11.

(4) Operating income for the core business segment for 1997 includes a $12.6
    million non-recurring charge to write-down certain subscriber devices to
    their net realizable value. See Note 11.

                                      F-46
<PAGE>   251
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

(5) Operating income for the core business segment for 1998 includes a
    restructuring charge of $74.0 million. See Note 2.

(6) Operating loss for the advanced messaging business segment for 1998 includes
    a provision of $4.1 million to write-off a deposit determined to be
    non-recoverable.

(7) Adjusted EBITDA is earnings before interest, income taxes, depreciation,
    amortization, minority interest, equity in loss of an unconsolidated
    subsidiary, restructuring charge, non-recurring charges, and extraordinary
    loss.

(8) Net interest expense is interest expense less interest income.

(9) Free Cash Flow is Adjusted EBITDA less capital expenditures (excluding
    payments for spectrum licenses) and debt service.

     Adjusted EBITDA and Free Cash Flow are not measures defined in generally
accepted accounting principles and should not be considered in isolation or as a
substitute for measures of performance in accordance with generally accepted
accounting principles.

16.  QUARTERLY FINANCIAL RESULTS (UNAUDITED)

     Quarterly financial information for the two years ended December 31, 1998
is summarized below.

<TABLE>
<CAPTION>
                                                      FIRST        SECOND     THIRD      FOURTH
                                                     QUARTER      QUARTER    QUARTER    QUARTER
    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)       ------------   --------   --------   --------
<S>                                                <C>            <C>        <C>        <C>
1997
     Services, rent and maintenance revenues.....  $    188,880   $199,584   $210,611   $219,386
     Product sales...............................        36,368     33,666     35,753     36,728
                                                   ------------   --------   --------   --------
          Total revenues.........................       225,248    233,250    246,364    256,114
     Cost of products sold.......................       (31,357)   (28,805)   (30,341)   (30,984)
                                                   ------------   --------   --------   --------
                                                        193,891    204,445    216,023    225,130
  Operating income (loss)........................          (188)     6,120      8,263     (6,687)(1)
     Loss before extraordinary item..............       (37,314)   (31,963)   (29,401)   (42,725)(1)
     Extraordinary loss..........................            --    (15,544)        --         --
     Net loss....................................       (37,314)   (47,507)   (29,401)   (42,725)(1)
  Net loss per share (basic and diluted):
     Loss before extraordinary item..............         (0.36)     (0.31)     (0.29)     (0.42)(1)
     Extraordinary loss..........................            --      (0.15)        --         --
     Net loss per share..........................         (0.36)     (0.46)     (0.29)     (0.42)(1)
  1998
     Services, rent and maintenance revenues.....  $    229,861   $235,172   $239,689   $240,802
     Product sales...............................        25,889     29,329     25,382     19,903
                                                   ------------   --------   --------   --------
          Total revenues.........................       255,750    264,501    265,071    260,705
     Cost of products sold.......................       (21,103)   (23,161)   (18,276)   (15,132)
                                                   ------------   --------   --------   --------
                                                        234,647    241,340    246,795    245,573
     Operating income (loss).....................       (56,605)(2)   19,803   17,998     (3,516)(3)
     Net loss....................................       (92,372)(2)  (15,619)  (16,428)  (37,590)(3)
     Net loss per share (basic and diluted)......         (0.90)(2)    (0.15)    (0.16)    (0.36)(3)
</TABLE>

- ---------------
(1) Operating loss for the fourth quarter of 1997 includes a $12.6 million
    non-recurring charge related to the write-down of certain subscriber devices
    to their net realizable value. See Note 11.

(2) Operating loss for the first quarter of 1998 includes a restructuring charge
    of $74.0 million. See Note 2.

(3) Operating loss for the fourth quarter of 1998 includes a provision of $4.1
    million to write-off a deposit determined to be non-recoverable during the
    fourth quarter of 1998.

                                      F-47
<PAGE>   252

                              PAGING NETWORK, INC.

                          CONSOLIDATED BALANCE SHEETS
                    (IN THOUSANDS, EXCEPT SHARE INFORMATION)
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                              DECEMBER 31,   SEPTEMBER 30,
                                                                  1998           1999
                                                              ------------   -------------
<S>                                                           <C>            <C>
                                          ASSETS
Current assets:
     Cash and cash equivalents..............................   $    3,077     $  102,961
     Accounts receivable, less allowance for doubtful
      accounts..............................................       84,440         77,253
     Inventories............................................        6,379         10,278
     Prepaid expenses and other assets......................       15,065         12,983
                                                               ----------     ----------
          Total current assets..............................      108,961        203,475
Property, equipment, and leasehold improvements, at cost....    1,452,870      1,511,209
     Less accumulated depreciation..........................     (547,599)      (727,712)
                                                               ----------     ----------
     Net property, equipment, and leasehold improvements....      905,271        783,497
Other non-current assets, at cost...........................      629,372        612,231
     Less accumulated amortization..........................      (62,360)       (78,318)
                                                               ----------     ----------
     Net other non-current assets...........................      567,012        533,913
                                                               ----------     ----------
                                                               $1,581,244     $1,520,885
                                                               ==========     ==========
                           LIABILITIES AND SHAREOWNERS' DEFICIT
Current liabilities:
     Accounts payable.......................................   $   96,478     $  109,962
     Accrued expenses.......................................       49,692         33,800
     Accrued interest.......................................       43,209         38,585
     Accrued restructuring costs, current portion...........        8,256         12,521
     Customer deposits......................................       22,735         17,785
     Deferred revenue.......................................       15,874         20,553
                                                               ----------     ----------
          Total current liabilities.........................      236,244        233,206
                                                               ----------     ----------
Long-term obligations.......................................    1,815,137      1,999,320
Accrued restructuring costs, non-current portion............       18,765         12,783
Minority interest...........................................        1,517             --
Commitments and contingencies...............................           --             --
Shareowners' deficit:
     Common Stock -- $.01 par, authorized 250,000,000
      shares; 103,640,554 and 103,960,240 shares issued and
      outstanding as of December 31, 1998 and September 30,
      1999, respectively....................................        1,036          1,040
     Paid-in capital........................................      132,950        134,161
     Accumulated other comprehensive income.................        2,378          1,161
     Accumulated deficit....................................     (626,783)      (860,786)
                                                               ----------     ----------
          Total shareowners' deficit........................     (490,419)      (724,424)
                                                               ----------     ----------
                                                               $1,581,244     $1,520,885
                                                               ==========     ==========
</TABLE>

                             See accompanying notes
                                      F-48
<PAGE>   253

                              PAGING NETWORK, INC.

                     CONSOLIDATED STATEMENTS OF OPERATIONS
                  (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                      THREE MONTHS ENDED      NINE MONTHS ENDED
                                                        SEPTEMBER 30,           SEPTEMBER 30,
                                                     --------------------   ---------------------
                                                       1998       1999        1998        1999
                                                     --------   ---------   ---------   ---------
<S>                                                  <C>        <C>         <C>         <C>
Services, rent and maintenance revenues............  $239,689   $ 223,063   $ 704,722   $ 696,566
Product sales......................................    25,382      24,347      80,600      68,969
                                                     --------   ---------   ---------   ---------
          Total revenues...........................   265,071     247,410     785,322     765,535
Cost of products sold..............................   (18,276)    (16,374)    (62,540)    (43,013)
                                                     --------   ---------   ---------   ---------
                                                      246,795     231,036     722,782     722,522
Operating expenses:
     Services, rent and maintenance................    52,643      63,033     158,011     193,705
     Selling.......................................    27,284      24,231      72,320      70,223
     General and administrative....................    79,811      84,648     224,035     260,877
     Depreciation and amortization.................    69,059      72,623     213,220     268,171
     Provision for asset impairment................        --          --          --      17,798
     Restructuring charge..........................        --          --      74,000          --
                                                     --------   ---------   ---------   ---------
          Total operating expenses.................   228,797     244,535     741,586     810,774
                                                     --------   ---------   ---------   ---------
Operating income (loss)............................    17,998     (13,499)    (18,804)    (88,252)
Other income (expense):
Interest expense...................................   (35,822)    (37,296)   (109,353)   (111,097)
Interest income....................................       534         681       1,564       1,986
Minority interest..................................       862         626       2,174         806
                                                     --------   ---------   ---------   ---------
          Total other income (expense).............   (34,426)    (35,989)   (105,615)   (108,305)
                                                     --------   ---------   ---------   ---------
Loss before cumulative effect of a change in
  accounting principle.............................   (16,428)    (49,488)   (124,419)   (196,557)
Cumulative effect of a change in accounting
  principle........................................        --          --          --     (37,446)
                                                     --------   ---------   ---------   ---------
Net loss...........................................  $(16,428)  $ (49,488)  $(124,419)  $(234,003)
                                                     ========   =========   =========   =========
Net loss per share (basic and diluted):
Loss before cumulative effect of a change in
  accounting principle.............................  $  (0.16)  $   (0.48)  $   (1.20)  $   (1.89)
Cumulative effect of a change in accounting
  principle........................................        --          --          --       (0.36)
                                                     --------   ---------   ---------   ---------
Net loss per share.................................  $  (0.16)  $   (0.48)  $   (1.20)  $   (2.25)
                                                     ========   =========   =========   =========
</TABLE>

                             See accompanying notes
                                      F-49
<PAGE>   254

                              PAGING NETWORK, INC.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                                NINE MONTHS ENDED
                                                                  SEPTEMBER 30,
                                                              ---------------------
                                                                1998        1999
                                                              ---------   ---------
<S>                                                           <C>         <C>
Operating activities:
     Net loss...............................................  $(124,419)  $(234,003)
     Adjustments to reconcile net loss to net cash provided
      by operating activities:
     Provision for asset impairment.........................         --      17,798
     Cumulative effect of a change in accounting
      principle.............................................         --      37,446
     Restructuring charge...................................     74,000          --
     Depreciation...........................................    193,242     254,884
     Amortization...........................................     19,978      13,287
     Provision for doubtful accounts........................     13,780      20,896
     Amortization of debt issuance costs....................      3,316       3,411
     Minority interest......................................     (2,174)       (806)
     Other..................................................      4,160          --
     Changes in operating assets and liabilities:
          Accounts receivable...............................    (11,990)    (14,841)
          Inventories.......................................      2,512      (4,066)
          Prepaid expenses and other assets.................      2,430       1,939
          Accounts payable..................................     11,752      15,132
          Accrued expenses and accrued interest.............      3,248     (20,147)
          Accrued restructuring costs.......................     (2,101)     (1,717)
          Customer deposits and deferred revenue............      3,010        (197)
                                                              ---------   ---------
Net cash provided by operating activities...................    190,744      89,016
                                                              ---------   ---------
Investing activities:
     Capital expenditures...................................   (171,295)   (162,830)
     Payments for spectrum licenses.........................     (6,044)     (3,835)
     Business acquisitions and joint venture investments....     (6,528)         --
     Other, net.............................................     10,873      (9,047)
                                                              ---------   ---------
Net cash used in investing activities.......................   (172,994)   (175,712)
                                                              ---------   ---------
Financing activities:
     Borrowings of long-term obligations....................    216,710     321,353
     Repayments of long-term obligations....................   (230,907)   (135,979)
     Proceeds from exercise of stock options................      7,607       1,206
                                                              ---------   ---------
Net cash provided by (used in) financing activities.........     (6,590)    186,580
                                                              ---------   ---------
Net increase in cash and cash equivalents...................     11,160      99,884
Cash and cash equivalents at beginning of period............      2,924       3,077
                                                              ---------   ---------
Cash and cash equivalents at end of period..................  $  14,084   $ 102,961
                                                              =========   =========
</TABLE>

                             See accompanying notes
                                      F-50
<PAGE>   255

                              PAGING NETWORK, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                               SEPTEMBER 30, 1999
                                  (UNAUDITED)

1.  MERGER AGREEMENT AND LIQUIDITY

     On November 8, 1999, Paging Network, Inc. (the Company) announced that the
Company had signed a definitive agreement (the Merger Agreement) to merge (the
Merger) with Arch Communications Group, Inc. (Arch). Under the terms of the
Merger Agreement, each share of the Company's common stock will be exchanged for
0.1247 share of Arch common stock. Under the terms of the Merger Agreement, the
Company's 8.875% senior subordinated notes due 2006, its 10% senior subordinated
notes due 2008, and its 10.125% senior subordinated notes due 2007
(collectively, the Notes), along with all accrued interest thereon, will be
exchanged in a registered exchange offer under which the holders of each $1,000
of outstanding principal of Notes will receive, upon consummation of the Merger,
approximately 64 shares of common stock of Arch. The Merger Agreement also
requires that certain senior notes and preferred stock of Arch be converted into
Arch common stock as part of a recapitalization of the combined company.

     As part of the Merger, the Company intends to distribute 80.5% of its
interest in Silverlake Communications, Inc., a wholly-owned subsidiary of the
Company doing business as Vast Solutions (Vast Solutions), to holders of the
Notes and the Company's common stock. Holders of the Notes will receive an
effective 68.9% interest in Vast Solutions, while holders of the Company's
common stock will receive an effective 11.6% interest. The remaining 19.5%
interest will be held by the combined company following the Merger.

     The Merger Agreement and related recapitalization of the combined company
require a 97.5% acceptance by the holders of the Notes and Arch's senior
discount noteholders, in addition to the affirmative votes of a majority of the
Company's stockholders, Arch's stockholders, and Arch's Series C preferred
stockholders, to complete the Merger. Consent of the lenders under the Company's
$1 billion revolving credit facility (the Credit Agreement) is also required.
The Merger Agreement also provides for the Company to file a "pre-packaged"
Chapter 11 reorganization plan if the level of acceptances from the holders of
the Notes is below 97.5%, but greater than 66.7%, the level required for
consummation of a "pre-packaged" Chapter 11 reorganization plan.

     Consummation of the Merger is subject to completion of the recapitalization
described, customary regulatory review, certain third-party consents, and the
approvals noted above. The Company anticipates the Merger to be completed during
the first half of 2000.

     The Company is currently in compliance with the financial covenants set
forth in all of its U.S. and Canadian debt agreements. The Company is pursuing
various efforts to improve the Company's domestic earnings before interest,
income taxes, depreciation, and amortization (EBITDA) for the fourth quarter of
1999. However, if these efforts prove unsuccessful, the Company will cease to
remain in compliance with the interest coverage covenant set forth in the
Company's Credit Agreement following the close of the fourth quarter of 1999. In
that event, the Company would seek to obtain a waiver for such non-compliance
under the Credit Agreement. If the Company is unable to obtain a waiver for such
non-compliance, the lenders will have various rights, including the right to
accelerate the outstanding indebtedness. Such acceleration would also result in
the Company being in default under the cross-default provisions of the Notes.

     The Company is currently precluded from further borrowings by the terms of
its Notes. As of November 5, 1999, the Company had approximately $50 million in
cash, which, combined with cash expected to be generated from operations, the
Company believes is sufficient to meet its obligations into the first quarter of
2000. If the Company does not achieve an improvement in its domestic EBITDA, the
Company may not have sufficient cash or borrowing capacity to meet its
obligations through the first

                                      F-51
<PAGE>   256
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                               SEPTEMBER 30, 1999
                                  (UNAUDITED)

quarter of 2000. The Company is currently exploring certain strategic and
financing alternatives to ensure continued liquidity through the consummation of
the Merger. However, there can be no assurance that the Company's efforts to
obtain additional liquidity will prove timely or successful or that the Merger
will be completed, and the Company may be required to reduce the level of its
operations and/or file for protection under Chapter 11 of the U.S. Bankruptcy
Code to restructure its obligations, including those under the Notes. Such a
filing would likely have a material impact on the Company's results of
operations and financial position. Furthermore, if the Merger is not ultimately
consummated, the Company may incur significant charges, including charges for
asset impairments and restructuring the Company's operations.

2.  THE COMPANY

     The Company is a provider of wireless messaging and information delivery
services. The Company provides service in all 50 states, the District of
Columbia, the U.S. Virgin Islands, Puerto Rico, Canada, and Spain, including
service in all of the largest 100 markets (in population) in the United States,
and owns a minority interest in a wireless messaging company in Brazil. The
consolidated financial statements include the accounts of all of its wholly and
majority-owned subsidiaries. All intercompany transactions have been eliminated.

3.  UNAUDITED INTERIM FINANCIAL STATEMENTS

     The interim consolidated financial information contained herein is
unaudited but, in the opinion of management, includes all adjustments, which are
of a normal recurring nature, except for the cumulative effect of a change in
accounting principle discussed in Note 4, the provision for asset impairment
discussed in Note 5, and the restructuring charge discussed in Note 6, necessary
for a fair presentation of the financial position, results of operations, and
cash flows for the periods presented. These financial statements have been
prepared in accordance with generally accepted accounting principles for interim
financial information and the instructions to Form 10-Q and Article 10 of
Regulation S-X. Accordingly, these financial statements do not include all of
the information and footnotes required by generally accepted accounting
principles for complete financial statements. The balance sheet as of December
31, 1998, has been derived from the audited financial statements as of that
date. Results of operations for the periods presented herein are not necessarily
indicative of results of operations for the entire year. These financial
statements and related notes should be read in conjunction with the financial
statements and notes included in the Company's Annual Report on Form 10-K for
the year ended December 31, 1998.

4.  ACCOUNTING CHANGES

     The Company adopted the provisions of Statement of Position 98-5 "Reporting
on the Costs of Start-Up Activities" (SOP 98-5), effective January 1, 1999. SOP
98-5 requires the expensing of all start-up costs as incurred as well as writing
off the remaining unamortized balance of capitalized start-up costs at the date
of adoption of SOP 98-5. The impact of the Company's adoption of SOP 98-5 was a
charge of $37 million representing the cumulative effect of a change in
accounting principle to write-off all unamortized start-up costs as of January
1, 1999, and an increase in services, rent and maintenance expenses of $5
million and $16 million, respectively, for the three and nine months ended
September 30, 1999, and a decrease in depreciation and amortization expense of
$1 million and $4 million, respectively, for the three and nine months ended
September 30, 1999.

                                      F-52
<PAGE>   257
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                               SEPTEMBER 30, 1999
                                  (UNAUDITED)

     Effective April 1, 1999, the Company changed the depreciable lives for its
subscriber devices and certain network equipment. The Company changed the
depreciable lives of its subscriber devices from three years to two years and
the depreciable life of certain of its network equipment from seven years to ten
years. The changes resulted from a review by the Company of the historical usage
periods of its subscriber devices and its network equipment and the Company's
expectations regarding future usage periods for subscriber devices considering
current and projected technological advances. As a result of these changes,
depreciation expense increased by approximately $8 million and $77 million,
respectively, during the three and nine months ended September 30, 1999.

     In March 1998, the Accounting Standards Executive Committee of the American
Institute of Certified Public Accountants issued Statement of Position 98-1,
"Accounting for the Costs of Computer Software Developed For of Obtained for
Internal Use" (SOP 98-1). SOP 98-1 requires the capitalization of certain costs
of developing or acquiring computer software for internal use. The Company
adopted the provisions of SOP 98-1, effective January 1, 1999. The adoption of
SOP 98-1 did not have a significant impact on the Company's results of
operations or financial position, as the Company's policy for accounting for the
costs of developing or acquiring computer software for internal use prior to the
adoption of SOP 98-1 was generally consistent with the provisions of SOP 98-1.

5.  PROVISION FOR ASSET IMPAIRMENT

     The Company recorded a provision of $18 million during the quarter ended
March 31, 1999, for the impairment of the assets of the Company's majority-owned
Spanish subsidiaries in accordance with Statement of Financial Accounting
Standards No. 121, "Accounting for the Impairment of Long-Lived Assets and for
Long-Lived Assets to Be Disposed Of ", which requires impairment losses to be
recorded on long-lived assets used in operations when indicators of impairment
are present and the undiscounted cash flows estimated to be generated by those
assets are less than the assets' carrying amount. During the first quarter of
1999, the Company made the decision to narrow its focus to its North American
operations and, as a result, made the decision to sell or otherwise dispose of
its operations in Spain. As a result of this decision, the Company analyzed the
estimated future cash flows expected to be generated from its Spanish operations
and determined that they would not be sufficient to recover the net book value
of the assets of the subsidiaries and, accordingly, recorded a provision to
write down the assets of the Spanish subsidiaries based on the estimated value
of the Company's investment in its Spanish subsidiaries as of March 31, 1999. No
cash costs have been incurred or are expected as a result of the provision for
the impairment of the assets of the Company's Spanish subsidiaries.

6.  RESTRUCTURING CHARGE

     In February 1998, the Company's Board of Directors approved a restructuring
of the Company's domestic operations (the Restructuring). As part of the
Restructuring, the Company is in the process of reorganizing its operations to
expand its sales organization, eliminate local and redundant administrative
operations, and consolidate certain key support functions. Subject to the
potential merger described in Note 1, the Company expects to eliminate a total
of approximately 1,600 positions, including positions already eliminated and net
of positions added, through the consolidation of redundant administrative
operations and certain key support functions located in offices throughout the
country into central facilities (the Centers of Excellence). As a result of the
Restructuring, the Company recorded a charge of

                                      F-53
<PAGE>   258
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                               SEPTEMBER 30, 1999
                                  (UNAUDITED)

$74 million, or $0.72 per share (basic and diluted), during the quarter ended
March 31, 1998. The components of the charge included (in thousands):

<TABLE>
<S>                                                           <C>
Write-down of property and equipment........................  $38,900
Lease obligations and terminations..........................   18,900
Severance and related benefits..............................   12,700
Other.......................................................    3,500
                                                              -------
          Total restructuring charge........................  $74,000
                                                              =======
</TABLE>

     The writedown of property and equipment related to a non-cash charge to
reduce the carrying amount of certain machinery and equipment, furniture and
fixtures, and leasehold improvements that the Company would not continue to
utilize following the Restructuring to their estimated net realizable value as
of the date such assets were projected to be disposed of or abandoned by the
Company, allowing for the recognition of normal depreciation expense on such
assets through their projected disposal date. The net realizable value of these
assets was determined based on management estimates, which considered such
factors as the nature and age of the assets to be disposed of, the timing of the
assets' disposal, and the method and potential costs of the disposal. Such
estimates are subject to change.

     The provision for lease obligations and terminations related primarily to
future lease commitments on local and regional office facilities that would be
closed as part of the Restructuring. The charge represented future lease
obligations, net of projected sublease income, on such leases past the dates the
offices would be closed by the Company, or, for certain leases, the cost of
terminating the leases prior to their scheduled expiration. Projected sublease
income was based on management estimates, which are subject to change. Cash
payments on the leases and lease terminations will occur over the remaining
lease terms, the majority of which expire prior to 2003.

     Through the elimination of certain local and regional administrative
operations and the consolidation of certain support functions, the Company
expects to eliminate a total of approximately 1,600 net positions, including
positions already eliminated, the majority of which are non-sales related
positions in local and regional offices. As a result of eliminating these
positions, the Company expects to involuntarily terminate an estimated 1,950
employees. The majority of the remaining severance and benefits costs to be paid
by the Company will be paid during 2000. The number of positions eliminated and
employees involuntarily terminated may be significantly impacted if the Merger
discussed in Note 1 is consummated.

     During the fourth quarter of 1998, the Company identified additional
furniture, fixtures, and equipment that would not be utilized following the
Restructuring, resulting in an additional non-cash charge of $3 million. This
charge was offset by reductions in the provisions for lease obligations and
terminations and severance costs as a result of refinements to the Company's
schedule for local and regional offices closures. Also as a result of the
refinements to the office closing schedule, the Company adjusted, effective
October 1, 1998, the depreciable lives of certain of the assets written down in
the first quarter of 1998, resulting in a decrease in depreciation expense of
approximately $5 million for the third quarter of 1999 and $15 million for the
nine months ended September 30, 1999.

                                      F-54
<PAGE>   259
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                               SEPTEMBER 30, 1999
                                  (UNAUDITED)

     The Company's restructuring activity from January 1, 1999 through September
30, 1999 is as follows (in thousands):

<TABLE>
<CAPTION>
                                                  UTILIZATION OF RESERVE
                                     BEGINNING    ----------------------    REMAINING
                                      RESERVE       CASH       NON-CASH      RESERVE
                                     ---------    --------    ----------    ---------
<S>                                  <C>          <C>         <C>           <C>
Lease obligation costs.............   $16,917      $  527       $    --      $16,390
Severance costs....................    10,104       1,190            --        8,914
                                      -------      ------       -------      -------
          Total....................   $27,021      $1,717       $    --      $25,304
                                      =======      ======       =======      =======
</TABLE>

7.  LONG-TERM OBLIGATIONS

     As of September 30, 1999, the Company had $745 million of borrowings
outstanding under its Credit Agreement.

8.  INCOME TAX PROVISION

     No provision or benefit for income taxes has been made for the three and
nine months ended September 30, 1998 and 1999, as the deferred benefit from
operating losses was offset by an increase in the valuation allowance.

9.  COMMON STOCK AND NET LOSS PER SHARE

     Net loss per share amounts are computed based on the weighted average
number of common shares outstanding. The number of shares used to compute per
share amounts for both the three months ended September 30, 1998 and 1999 were
104 million. The number of shares used to compute per share amounts for the nine
months ended September 30, 1998 and 1999 were 103 million and 104 million,
respectively. The average number of options to purchase shares of the Company's
Common Stock during the three and nine months ended September 30, 1998 were 8
million and 7 million, respectively, at exercise prices ranging from $2.67 per
share to $25.50 per share. The average number of options to purchase shares of
the Company's Common Stock during the three and nine months ended September 30,
1999 were 10 million, at exercise prices ranging from $2.73 per share to $17.13
per share. These stock options were not included in the computation of diluted
earnings per share because the effect of assuming their exercise would have been
antidilutive.

     The Company has 275 million authorized shares, of which 250 million are
Common Stock and 25 million are preferred stock. As of September 30, 1999, there
were no preferred shares issued or outstanding.

10.  COMPREHENSIVE LOSS

     Comprehensive loss for the three and nine months ended September 30, 1998
and 1999, is as follows (in thousands):

<TABLE>
<CAPTION>
                                                    THREE MONTHS             NINE MONTHS
                                                ENDED SEPTEMBER 30,      ENDED SEPTEMBER 30,
                                                --------------------    ----------------------
                                                  1998        1999        1998         1999
                                                --------    --------    ---------    ---------
<S>                                             <C>         <C>         <C>          <C>
Net loss......................................  $(16,428)   $(49,488)   $(124,419)   $(234,003)
Foreign currency translation adjustments......       526        (210)       1,636       (1,217)
                                                --------    --------    ---------    ---------
          Total comprehensive loss............  $(15,902)   $(49,698)   $(122,783)   $(235,220)
                                                ========    ========    =========    =========
</TABLE>

                                      F-55
<PAGE>   260
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                               SEPTEMBER 30, 1999
                                  (UNAUDITED)

11.  STATEMENT OF CASH FLOWS INFORMATION

     Cash and cash equivalents include highly liquid debt instruments with an
original maturity of three months or less. As of September 30, 1999, cash
equivalents also include investments in money market instruments, which are
carried at fair market value. Cash payments made for interest during the nine
months ended September 30, 1998 and 1999, were approximately $108 million and
$112 million, respectively, net of interest capitalized during the nine months
ended September 30, 1998 and 1999 of $14 million and $17 million, respectively.
There were no significant federal or state income taxes paid or refunded for the
nine months ended September 30, 1998 and 1999.

12.  SEGMENT INFORMATION

     The Company has determined that it has two reportable segments, core
operations and advanced messaging operations. The Company's basis for the
segments relates to the types of products and services each segment provides.
The core operating segment includes the traditional display and alphanumeric
services, which are basic one-way services, and 1 1/2-way paging services. The
advanced messaging operating segment consists of the Company's new 2-way
wireless messaging services, VoiceNow service and Iridium WorldPage, and the
operations of Vast Solutions, which include wireless integration products,
consumer content, and wireless software development and sales.

     The following table presents certain information related to the Company's
business segments for the three and nine months ended September 30, 1998 and
1999.

<TABLE>
<CAPTION>
                                                     THREE MONTHS             NINE MONTHS
                                                 ENDED SEPTEMBER 30,      ENDED SEPTEMBER 30,
                                                 --------------------    ---------------------
                                                   1998        1999        1998        1999
                                                 --------    --------    --------    ---------
<S>                                              <C>         <C>         <C>         <C>
Net Revenues (1):
     Core (2)..................................  $246,134    $227,238    $721,960    $ 712,469
     Advanced Messaging........................       661       3,798         822       10,053
                                                 --------    --------    --------    ---------
                                                 $246,795    $231,036    $722,782    $ 722,522
                                                 ========    ========    ========    =========
Operating income (loss):
     Core (2)..................................  $ 28,353    $   (379)   $  1,778(3) $ (54,625)(4)
     Advanced Messaging........................   (10,355)    (13,120)    (20,582)     (33,627)
                                                 --------    --------    --------    ---------
                                                 $ 17,998    $(13,499)   $(18,804)   $ (88,252)
                                                 ========    ========    ========    =========
Adjusted EBITDA (5):
     Core (2)..................................  $ 92,759    $ 71,694    $276,855    $ 229,551
     Advanced Messaging........................    (5,702)    (12,570)     (8,439)     (31,834)
                                                 --------    --------    --------    ---------
                                                 $ 87,057    $ 59,124    $268,416    $ 197,717
                                                 ========    ========    ========    =========
Free Cash Flow (6):
     Core (2)..................................  $ 30,432    $ 29,009    $107,255    $  91,176
     Advanced Messaging........................   (62,232)    (63,374)   (117,923)    (165,400)
                                                 --------    --------    --------    ---------
                                                 $(31,800)   $(34,365)   $(10,668)   $ (74,224)
                                                 ========    ========    ========    =========
</TABLE>

- ---------------

(1) Net Revenues are revenues from services, rent, and maintenance plus product
    sales less the cost of products sold.

(2) The international operations of the Company currently consist entirely of
    core services and accordingly are included in the Company's core business
    segment.

(3) Operating loss for the core business segment for the first nine months of
    1998 includes a restructuring charge of $74 million. See Note 6.

                                      F-56
<PAGE>   261
                              PAGING NETWORK, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                               SEPTEMBER 30, 1999
                                  (UNAUDITED)

(4) Operating loss for the core business segment for the first nine months of
    1999 includes a provision for asset impairment of $18 million. See Note 5.

(5) Adjusted EBITDA is earnings before interest, income taxes, depreciation,
    amortization, minority interest, restructuring charge, provision for asset
    impairment, and cumulative effect of a change in accounting principle.

(6) Free Cash Flow is Adjusted EBITDA less capital expenditures (excluding
    payments for spectrum licenses) and debt service.

     The Company's method for allocating costs to business segments is not
consistent with the contemplated asset transfer in connection with the intended
distribution of Vast Solutions in connection with the Merger. See Note 1.

     Adjusted EBITDA and Free Cash Flow are not measures defined in generally
accepted accounting principles and should not be considered in isolation or as
substitutes for measures of performance in accordance with generally accepted
accounting principles.

                                      F-57
<PAGE>   262

                         REPORT OF INDEPENDENT AUDITORS

The Board of Directors
MobileMedia Communications, Inc.

     We have audited the accompanying consolidated balance sheets of MobileMedia
Communications, Inc. and Subsidiaries ("MobileMedia") as of December 31, 1997
and 1998, and the related consolidated statements of operations, stockholders'
equity (deficit) and cash flows for each of the three years in the period ended
December 31, 1998. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
consolidated financial statements based on our audits.

     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the consolidated financial position of
MobileMedia Communications, Inc. and Subsidiaries at December 31, 1997 and 1998
and the consolidated results of their operations and cash flows for each of the
three years in the period ended December 31, 1998 in conformity with generally
accepted accounting principles.

     The accompanying financial statements have been prepared assuming that
MobileMedia will continue as a going concern. As more fully described in Note 1,
on January 30, 1997, MobileMedia Corporation and substantially all of its
subsidiaries filed voluntary petitions for reorganization under Chapter 11 of
the United States Bankruptcy Code in the United States Bankruptcy Court for the
District of Delaware (the Bankruptcy Court). Additionally, as more fully
described in Note 11, on April 8, 1997, the Federal Communications Commission
("FCC") issued a Public Notice commencing an administrative hearing into the
qualification of MobileMedia to remain a licensee. These events, and
circumstances relating to the Chapter 11 filing with the Bankruptcy Court,
including MobileMedia's highly leveraged financial structure, non-compliance
with certain covenants of loan agreements with banks and note indentures, net
working capital deficiency and recurring losses from operations, raise
substantial doubt about MobileMedia's ability to continue as a going concern.
Although MobileMedia is currently operating the business as a debtor-in-
possession under the jurisdiction of the Bankruptcy Court, the continuation of
the business as a going concern is contingent upon, among other things, the
ability to (a) gain approval of the creditors and confirmation by the Bankruptcy
Court of a plan of reorganization, (b) maintain compliance with all covenants
under the debtor-in-possession financing agreement, (c) achieve satisfactory
levels of future operating profit and (d) retain FCC qualification as a
licensee. The financial statements do not include any adjustments to reflect the
possible future effects on the recoverability and classification of assets or
the amounts and classification of liabilities that may result from the outcome
of these uncertainties.

                                            /S/ ERNST & YOUNG LLP

MetroPark, New Jersey
February 12, 1999, except for the eighth paragraph of Note 1 and
  the second paragraph of Note 6, as to which the date is March 26, 1999
  and the ninth paragraph of Note 1, as to which the date is April 12, 1999

                                      F-58
<PAGE>   263

               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES
                          CONSOLIDATED BALANCE SHEETS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                    DECEMBER 31,
                                                              -------------------------    MARCH 31,
                                                                 1997          1998          1999
                                                              -----------   -----------   -----------
                                                                                          (UNAUDITED)
<S>                                                           <C>           <C>           <C>
                                               ASSETS
Current assets
    Cash and cash equivalents...............................  $    10,920   $     1,218   $        --
    Accounts receivable (less allowance for uncollectible
       accounts of $26,500, $15,000 and $14,893 in 1997,
       1998 and 1999, respectively).........................       55,432        38,942        37,270
    Inventories.............................................          868         2,192         1,609
    Prepaid expense.........................................        5,108         5,523         5,261
    Other current assets....................................        2,783         4,855         4,900
                                                              -----------   -----------   -----------
         Total current assets...............................       75,111        52,730        49,040
                                                              -----------   -----------   -----------
Investment in net assets of equity affiliate................        1,788         1,400            --
Property and equipment, net.................................      257,937       219,642       225,566
Intangible assets, net......................................      295,358       266,109       258,793
Other assets................................................       24,940        21,573        20,610
                                                              -----------   -----------   -----------
         Total assets.......................................  $   655,134   $   561,454   $   554,009
                                                              ===========   ===========   ===========

                                LIABILITIES AND STOCKHOLDERS' DEFICIT
Liabilities not subject to compromise
    Debtor-In-Possession (DIP) credit facility..............  $    10,000   $        --   $     5,000
    Accrued restructuring costs.............................        4,897         5,163         7,197
    Accrued wages, benefits and payroll.....................       11,894        12,033         9,944
    Book cash overdraft.....................................           --            --         1,255
    Accounts payable--post petition.........................        2,362         1,703         7,334
    Accrued interest........................................        4,777         3,692         3,566
    Accrued expenses and other current liabilities..........       35,959        35,735        30,061
    Current income taxes payable............................           --         2,871         1,200
    Advance billing and customer deposits...................       34,252        28,554        28,892
    Deferred gain on tower sale.............................           --        68,444        67,278
                                                              -----------   -----------   -----------
         Total liabilities not subject to compromise........      104,141       158,195       161,727
                                                              -----------   -----------   -----------
Liabilities subject to compromise
    Accrued wages, benefits and payroll taxes...............          562           647           476
    Accrued interest........................................       18,450        17,579        17,578
    Accounts payable--pre petition..........................       19,646        15,410        15,351
    Accrued expenses and other current liabilities..........       20,663        15,285        12,231
    Debt....................................................    1,075,681       905,681       905,681
    Other liabilities.......................................        2,915            --            --
                                                              -----------   -----------   -----------
         Total liabilities subject to compromise............    1,137,917       954,602       951,317
                                                              -----------   -----------   -----------
    Deferred tax liabilities................................        2,655         2,655         2,655
Stockholders' deficit
    Common stock (1 share, no par value, issued and
       outstanding at December 31, 1997 and 1998 and March
       31, 1999)............................................           --            --            --
Additional paid-in-capital..................................      676,025       676,025       676,025
Accumulated deficit--pre petition...........................   (1,154,420)   (1,154,420)   (1,154,420)
Accumulated deficit--post petition..........................     (111,184)      (75,603)      (83,295)
                                                              -----------   -----------   -----------
         Total stockholders' deficit........................     (589,579)     (553,998)     (561,690)
                                                              -----------   -----------   -----------
         Total liabilities and stockholders' deficit........  $   655,134   $   561,454   $   554,009
                                                              ===========   ===========   ===========
</TABLE>

                            See accompanying notes.
                                      F-59
<PAGE>   264

               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                   THREE MONTHS
                                                YEAR ENDED DECEMBER 31,           ENDED MARCH 31,
                                           ----------------------------------   -------------------
                                              1996         1997        1998       1998       1999
                                           -----------   ---------   --------   --------   --------
                                                                                    (UNAUDITED)
<S>                                        <C>           <C>         <C>        <C>        <C>
Revenue
     Services, rents and maintenance.....  $   568,892   $ 491,174   $423,059   $108,542   $100,631
     Product sales.......................       71,818      36,218     26,622      6,621      5,193
                                           -----------   ---------   --------   --------   --------
          Total revenues.................      640,710     527,392    449,681    115,163    105,824
Cost of products sold....................      (72,595)    (35,843)   (22,162)    (5,513)    (3,516)
                                           -----------   ---------   --------   --------   --------
                                               568,115     491,549    427,519    109,650    102,308
Operating expenses
     Services, rents and maintenance.....      144,050     139,333    111,589     28,899     27,077
     Selling.............................       96,817      69,544     61,106     15,703     14,136
     General and administrative..........      218,607     179,599    133,003     34,908     31,481
     Reduction of liabilities subject to
       compromise........................           --          --    (10,461)        --     (3,050)
     Impairment of long-lived assets.....      792,478          --         --         --         --
     Restructuring costs.................        4,256      19,811     18,624      4,558      5,067
     Depreciation........................      136,434     110,376     86,624     24,193     20,501
     Amortization........................      212,264      29,862     29,835      7,478      7,468
     Amortization of deferred gain on
       tower sale........................           --          --     (1,556)        --     (1,167)
                                           -----------   ---------   --------   --------   --------
          Total operating expenses.......    1,604,906     548,525    428,764    115,739    101,513
                                           -----------   ---------   --------   --------   --------
Operating Income (loss)..................   (1,036,791)    (56,976)    (1,245)    (6,089)       795
Other income (expense)
     Interest expense, net...............      (92,663)    (67,611)   (53,043)   (14,626)   (10,018)
     Gain (loss) on sale/disposal of
       assets............................           68           3     94,165          1       (323)
     Other...............................           --          --       (338)        --      2,063
                                           -----------   ---------   --------   --------   --------
          Total other expense............      (92,595)    (67,608)    40,784    (14,625)    (8,278)
                                           -----------   ---------   --------   --------   --------
Income (loss) before income taxes
  (benefit)..............................   (1,129,386)   (124,584)    39,539    (20,714)    (7,483)
Income taxes (benefit)...................      (69,442)         --      3,958         --        209
                                           -----------   ---------   --------   --------   --------
Net income (loss)........................  $(1,059,944)  $(124,584)  $ 35,581   $(20,714)  $ (7,692)
                                           ===========   =========   ========   ========   ========
</TABLE>

                            See accompanying notes.
                                      F-60
<PAGE>   265

               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES
      CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                 ADDITIONAL   ACCUMULATED     ACCUMULATED
                                                  PAID IN       DEFICIT         DEFICIT
                                                  CAPITAL     PRE-PETITION   POST-PETITION      TOTAL
                                                 ----------   ------------   -------------   -----------
<S>                                              <C>          <C>            <C>             <C>
Balance at December 31, 1995...................   $659,829    $   (81,076)     $       0     $   578,753
Capital contribution from MobileMedia..........     12,800             --             --          12,800
Net loss.......................................         --     (1,059,944)            --      (1,059,944)
                                                  --------    -----------      ---------     -----------
Balance at December 31, 1996...................    672,629     (1,141,020)             0        (468,391)
Capital contribution from MobileMedia..........      3,396             --             --           3,396
Net loss.......................................         --        (13,400)      (111,184)       (124,584)
                                                  --------    -----------      ---------     -----------
Balance at December 31, 1997...................    676,025     (1,154,420)      (111,184)       (589,579)
Net income.....................................         --             --         35,581          35,581
                                                  --------    -----------      ---------     -----------
Balance at December 31, 1998...................    676,025     (1,154,420)       (75,603)       (553,998)
Net loss (unaudited)...........................         --             --         (7,692)         (7,692)
                                                  --------    -----------      ---------     -----------
Balance at March 31, 1999 (unaudited)..........   $676,025    $(1,154,420)     $ (83,295)    $  (561,690)
                                                  ========    ===========      =========     ===========
</TABLE>

                            See accompanying notes.
                                      F-61
<PAGE>   266

               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                     THREE MONTHS ENDED
                                                     YEAR ENDED DECEMBER 31,              MARCH 31,
                                               -----------------------------------   -------------------
                                                  1996         1997        1998        1998       1999
                                               -----------   ---------   ---------   --------   --------
                                                                                         (UNAUDITED)
<S>                                            <C>           <C>         <C>         <C>        <C>
Operating activities
    Net income (loss)........................  $(1,059,944)  $(124,584)  $  35,581   $(20,714)  $ (7,692)
Adjustments to reconcile net loss to net cash
  provided by (used in) Operating activities:
    Depreciation and amortization............      348,698     140,238     116,459     31,672     27,969
    Amortization of deferred gain on tower
       sale..................................           --          --      (1,556)        --     (1,167)
    Income tax benefit.......................      (69,442)         --          --         --         --
    Accretion of note payable discount.......       16,792       1,485          --         --         --
    Provision for uncollectible accounts.....       56,556      65,181      14,841      4,981      2,131
    Reduction of liabilities subject to
       compromise............................           --          --     (10,461)        --     (3,050)
    Recognized gain on sale of tower
       assets................................           --          --     (94,165)        --         --
    Impairment of long-lived assets..........      792,478          --          --         --         --
    Undistributed earnings of affiliate,
       net...................................          160          69         (87)        22         --
Change in operating assets and liabilities:
    Accounts receivable......................      (55,965)    (53,904)      1,649      2,813       (459)
    Inventories..............................        2,433      12,514      (1,324)       407        583
    Prepaid expenses and other assets........       12,145        (686)        590     (1,052)     1,028
    Accounts payable, accrued expenses and
       other liabilities.....................       13,283     (25,393)     (7,065)     1,413     (1,791)
                                               -----------   ---------   ---------   --------   --------
    Net cash provided by (used in) operating
       activities............................       57,194      14,920      54,462     19,542     17,552
                                               -----------   ---------   ---------   --------   --------
Investing activities:
    Construction and capital expenditures,
       including net changes in pager
       assets................................     (161,861)    (40,556)    (53,867)    (4,854)   (26,806)
    Net proceeds from the sale of tower
       assets................................           --          --     169,703         --         --
    Net proceeds from the sale of investment
       in Abacus.............................           --          --          --         --      1,400
    Net loss on the disposal of fixed
       assets................................           --          --          --         --        381
    Acquisition of businesses................     (866,460)         --          --         --         --
                                               -----------   ---------   ---------   --------   --------
Net cash provided by (used in) investing
  activities.................................   (1,028,321)    (40,556)    115,836     (4,854)   (25,025)
                                               -----------   ---------   ---------   --------   --------
Financing activities:
    Book cash overdraft......................           --          --          --         --      1,255
    Capital contribution by MobileMedia
       Corporation...........................       12,800       3,396          --         --         --
    Payment of debt issue costs..............       (6,939)         --          --         --         --
    Borrowing from revolving credit
       facilities............................      580,250          --          --         --         --
    Repayments on revolving credit
       facilities............................           --          --    (170,000)        --         --
    Borrowing from DIP credit facilities.....           --      47,000          --         --      5,000
    Repayments on DIP credit facilities......           --     (37,000)    (10,000)   (10,000)        --
                                               -----------   ---------   ---------   --------   --------
Net cash provided by (used in) financing
  activities.................................      586,111      13,396    (180,000)   (10,000)     6,255
                                               -----------   ---------   ---------   --------   --------
Net (decrease) increase in cash, cash
  equivalents designated and cash designated
  for the MobileComm acquisition.............     (385,016)    (12,240)     (9,702)     4,688     (1,218)
Cash and cash equivalents at beginning of
  period.....................................      408,176      23,160      10,920     10,920      1,218
                                               -----------   ---------   ---------   --------   --------
Cash and cash equivalents at end of period...  $    23,160   $  10,920   $   1,218   $ 15,608   $      0
                                               ===========   =========   =========   ========   ========
</TABLE>

                            See accompanying notes.
                                      F-62
<PAGE>   267

               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                             (DOLLARS IN THOUSANDS)

1.  CHAPTER 11 REORGANIZATION AND BASIS OF PRESENTATION

     On January 30, 1997 (the "Petition date"), MobileMedia Corporation
("Parent"), its wholly owned subsidiary MobileMedia Communications, Inc., and
all seventeen of MobileMedia Communications, Inc.'s subsidiaries ("MobileMedia")
(collectively with Parent, the "Debtors"), filed for protection under Chapter 11
of Title 11 of the United States Code (the "Bankruptcy Code"). The Debtors are
operating as debtors-in-possession and are subject to the jurisdiction of the
United States Bankruptcy Court for the District of Delaware (the "Bankruptcy
Court"). Chapter 11 is the principal business reorganization chapter of the
Bankruptcy Code. Under Chapter 11 of the Bankruptcy Code, a debtor is authorized
to reorganize its business for the benefit of its creditors and stockholders. In
addition to permitting rehabilitation of the debtor, another goal of Chapter 11
is to promote equality of treatment of creditors and equity security holders of
equal rank with respect to the restructuring of debt. In furtherance of these
two goals, upon the filing of a petition for reorganization under Chapter 11,
section 362(a) of the Bankruptcy Code generally provides for an automatic stay
of substantially all acts and proceedings against the debtor and its property,
including all attempts to collect claims or enforce liens that arose prior to
the commencement of the debtor's case under Chapter 11.

     The Bankruptcy Court has exercised supervisory powers over the operations
of the Debtors with respect to the employment of attorneys, investment bankers
and other professionals, and transactions out of the Debtors' ordinary course of
business or otherwise requiring bankruptcy court approval under the Bankruptcy
Code. The Debtors have been paying undisputed obligations that have arisen
subsequent to the Petition date on a timely basis.

     Since the Petition date, the Bankruptcy Court has entered orders, among
other things, allowing the Debtors (i) to pay certain customer refunds and
deposits in the ordinary course of business, (ii) to pay wages, salaries and
benefits owing to employees, and (iii) to pay specified pre-petition taxes owing
to various governmental entities. On February 6, 1997, the Bankruptcy Court
entered an order authorizing the Debtors to pay approximately $46,000 in
pre-petition amounts owing to certain essential vendors.

     Under the Bankruptcy Code, the Debtors may elect to assume or reject real
estate leases, employment contracts, personal property leases, service contracts
and other unexpired executory pre-petition leases and contracts, subject to
Bankruptcy Court approval. Assumption of a contract requires the Debtors, among
other things, to cure all defaults under the contract, including payment of all
pre-petition liabilities. Rejection of a contract constitutes a breach of that
contract as of the moment immediately preceding the Chapter 11 filing and the
other party has the right to assert a general, unsecured claim against the
bankruptcy estate for damages arising out of such breach. These parties may also
seek to assert post-petition administrative claims against the Debtors to the
extent that the Debtors utilize the collateral or services of such parties
subsequent to the commencement of the Chapter 11 proceedings. The Debtors cannot
presently determine or reasonably estimate the ultimate liability that may
result from payments required to cure defaults under assumed leases and
contracts or from the filing of claims for all leases and contracts which may be
rejected.

     In connection with the Chapter 11 filing, the Debtors notified all known
claimants that pursuant to an order of the Bankruptcy Court, all proofs of
claims, on account of pre-petition obligations, other than for certain
governmental entities, were required to be filed by June 16, 1997 (the "Bar
Date"). As of March 31, 1999, approximately 2,581 proofs of claim had been filed
against the Debtors. Included among the claims filed are claims of unspecified
and undeterminable amounts. The Debtors consider the amounts set forth in
certain proofs of claim to be inaccurate estimates of the Debtors' liabilities.
As of March 31, 1999, the Debtors had secured orders of the Bankruptcy Court
reducing approximately 1,607 claims filed in an aggregate amount of
approximately $143,362 to an allowed amount of $10,239. As of March 31,

                                      F-63
<PAGE>   268
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

1999, the Debtors had also analyzed and resolved an additional 876 proofs of
claim, representing an aggregate allowed amount of $8,389. The Debtors expect
the objection process to continue.

     On August 20, 1998, MobileMedia announced that it had executed a merger
agreement with Arch Communications Group, Inc. ("Arch"), pursuant to which
MobileMedia Communications, Inc. will be merged with and into a wholly-owned
subsidiary of Arch. Immediately prior to the Merger, Parent will contribute all
of its assets to MobileMedia Communications, Inc. Also on August 20, 1998, the
Debtors filed a First Amended Joint Plan of Reorganization that reflects the
proposed merger with Arch. On September 3, 1998, Arch and MobileMedia executed
an amendment to the merger agreement and the Debtors filed a subsequent Second
Amended Joint Plan of Reorganization. On December 1, 1998 Arch and MobileMedia
executed a second amendment to the merger agreement and on December 2, 1998, the
Debtors filed a Third Amended Joint Plan of Reorganization (the "Plan"). As of
February 9, 1999, Arch and MobileMedia executed a third amendment to the merger
agreement. Under the Plan, the Debtors' secured creditors will receive cash in
an amount equal to their allowed pre-petition claims and the Debtors' unsecured
creditors will receive cash or equity securities of Arch in satisfaction of
their pre-petition claims against the Debtors. Because there are a variety of
conditions precedent to the consummation of the Plan and the merger with Arch,
there can be no assurance that the transactions contemplated thereby will be
consummated.

     In December 1998 and January 1999, MobileMedia solicited the votes of its
creditors on the Plan. 100% of the voting creditors in Class 4 voted to accept
the Plan. As to Allowed Claims in Class 5, 83% in number and 91% in amount of
those voting voted to accept the Plan. Of the Allowed Claims in Class 6 that
voted on the Plan, 968 of such holders (approximately 94% in number and 69% in
amount) voted to accept the Plan, and 61 of such holders (approximately 6% in
number and 31% in amount) voted to reject the Plan.

     Objections to confirmation were filed by New Generation Advisors, Inc.
("New Generation"), Merrill Lynch Phoenix Fund, Inc., Merrill Lynch Corporate
Bond Fund, Inc.--High Income Portfolio and State Street Research High Income
Fund (the "Objectors"). On February 12, 1999, at a continued hearing on
confirmation of the Plan, the Bankruptcy Court ordered MobileMedia to provide
due diligence to a nominee of New Generation, to prepare supplemental disclosure
to the holders of Allowed Claims in Class 6, and to resolicit the votes of such
holders on the Plan. At a hearing held before the Bankruptcy Court on February
18, 1999, the Bankruptcy Court entered an order approving a form of Notice and
Supplemental Disclosure, directing MobileMedia to resolicit the votes of all
holders of Allowed Class 6 Claims and establishing March 23, 1999 as (a) the
Supplemental Voting Deadline for Class 6 and (b) the deadline for any further
objections to confirmation of the Plan arising out of the matters set forth in
the Notice of Supplemental Disclosure. No further objections to the Plan were
received by March 23, 1999. Taking into account the resolicitation of Class 6,
the Plan was accepted by 59.6% in number and 69.3% in dollar amount of voting
Class 6 creditors.

     On March 22, 1999, the Debtors and various other parties (including the
Objectors, Arch, the Committee and the Agent for the Company's pre-petition
secured lenders) executed a stipulation (the "Stipulation") that was approved by
the Bankruptcy Court, effective as of March 23, 1999. The Stipulation resolved
the pending objections to the Plan by providing for the withdrawal of the
Objectors' objections and the waiver of all appeal rights of the Objectors. The
Plan was confirmed by the Bankruptcy Court on April 12, 1999.

     The consolidated financial statements at December 31, 1997, 1998 and March
31, 1999 (unaudited) have been prepared on a going concern basis which assumes
continuity of operations and realization of assets and liquidation of
liabilities in the ordinary course of business. As discussed herein, there are
significant uncertainties relating to the ability of MobileMedia to continue as
a going concern.

                                      F-64
<PAGE>   269
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

The consolidated financial statements do not include any adjustments relating to
the recoverability and classification of recorded asset amounts, or the amounts
and classification of liabilities that might be necessary as a result of the
outcome of the uncertainties discussed herein.

2.  THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

  The Company

     MobileMedia provides paging and wireless messaging services in the United
States, including the 100 largest metropolitan areas.

  Consolidation

     The consolidated financial statements include the accounts of MobileMedia
and its wholly-owned subsidiaries (MobileMedia Communications, Inc.
(California), MobileMedia Paging, Inc., MobileMedia DP Properties, Inc., Dial
Page Southeast, Inc., Radio Call Company of Va., Inc., MobileMedia PCS, Inc.,
Mobile Communications Corporation of America, MobileComm of Florida, Inc.,
MobileComm of Tennessee, Inc., MobileComm of the Midsouth, Inc., MobileComm
Nationwide Operations, Inc., MobileComm of the West, Inc., MobileComm of the
Northeast, Inc., MobileComm of the Southeast, Inc., MobileComm of the Southeast
Private Carrier Operations, Inc., MobileComm of the Southwest, Inc. and FWS
Radio, Inc.). All significant intercompany accounts and transactions have been
eliminated.

  Cash Equivalents

     MobileMedia considers all highly-liquid securities with an original
maturity of less than three months to be cash equivalents.

  Concentrations of Credit Risk

     Financial instruments that potentially subject MobileMedia to
concentrations of credit risk consist principally of temporary cash investments
and accounts receivable. MobileMedia places its cash with high-quality
institutions and, by policy, limits its credit exposure to any one institution.
Although MobileMedia faces significant credit risk from its customers, such risk
does not result from a concentration of credit risk as a result of the large
number of customers which comprise MobileMedia's customer base. MobileMedia
generally does not require collateral or other security to support customer
receivables.

  Inventories

     MobileMedia values inventories at the lower of specific cost or market
value. Inventories consist of pagers held specifically for resale by
MobileMedia.

  Revenue Recognition

     MobileMedia recognizes revenue under service, rent and maintenance
agreements with customers at the time the related services are performed.
Advance billings for services are deferred and recognized as revenue when
earned. MobileMedia leases (as lessor) certain pagers under operating leases.
Sales of pagers are recognized upon delivery.

                                      F-65
<PAGE>   270
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

  Estimates

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ from these estimates.

  Property and Equipment

     Effective October 1, 1997, MobileMedia shortened the estimated useful life
of pagers from four to three years. This change resulted in additional
depreciation expense of approximately $2,500 in 1997.

     Property and equipment are stated at cost, less accumulated depreciation.

     MobileMedia purchases a significant percentage of its pagers from one
supplier. Any disruption of such supply could have a material impact on
MobileMedia's operations.

     Expenditures for maintenance are charged to expense as incurred.

     Upon retirement of pagers, the cost and related accumulated depreciation
are removed from the accounts and the net book value, if any, is charged to
depreciation expense. Upon the sale of pagers, the net book value is charged to
cost of products sold.

     Depreciation and amortization are computed using the straight-line method
over the following estimated useful lives:

<TABLE>
<S>                                                           <C>
Pagers......................................................     3 years
Radio transmission equipment................................    10 years
Computer equipment..........................................     4 years
Furniture and fixtures......................................     5 years
Leasehold improvements......................................  1-10 years
Buildings...................................................    30 years
</TABLE>

  Intangible Assets

     Intangible assets consist primarily of customer lists and FCC licenses
which are being amortized principally using the straight-line method over
periods ranging from 3 to 25 years. In connection with the impairment writedown
discussed below, MobileMedia revised the useful lives of FCC licenses and
customer lists to 25 years and 3 years, respectively.

  Impairment of Long-Lived Assets

     In accordance with Statement of Financial Accounting Standards No. 121,
"Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to
be Disposed Of", MobileMedia records impairment losses on long-lived assets used
in operations when events and circumstances indicate that the assets might be
impaired and the undiscounted cash flows estimated to be generated by those
assets are less than the net book value of those assets. In 1997, MobileMedia
determined impairment existed with respect to its long-lived assets as of
December 31, 1996. Such determination was based upon the existence of adverse
business circumstances, such as MobileMedia's bankruptcy, its 1996 operating
results and the uncertainty associated with the pending FCC proceeding. In July
1998, MobileMedia evaluated the ongoing value of its long-lived assets effective
December 31, 1996 and, based on this evaluation, MobileMedia determined that
intangible assets with a net book value of $1,118,231 were impaired and wrote
them down by $792,478 to their estimated fair value. Fair value was determined
through the

                                      F-66
<PAGE>   271
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

application of generally accepted valuation methods to MobileMedia's projected
cash flows, discounted at an estimated market rate of interest. The remaining
carrying amount of long-lived assets are expected to be recovered based on
MobileMedia's estimates of cash flows. However, it is possible that such
estimates could change based upon the uncertainties of the bankruptcy process
and because future operating and financial results may differ from those
projected which may require further writedowns to fair value.

  Debt Issue Costs

     Debt issue costs, which relate to the long term debt discussed in Note 6,
are reported as "Other assets" in the accompanying balance sheets. Such costs
amounted to $22,939 at December 31, 1997 and $19,295 at December 31, 1998 and
$18,384 at March 31, 1999 (unaudited) and are being amortized on a straight line
basis over the term of the related debt.

  Book Cash Overdraft

     Under MobileMedia's cash management system, checks issued but not presented
to banks occasionally result in overdraft balances for accounting purposes and
are classified as "Book cash overdraft" in the balance sheet.

  Liabilities Subject to Compromise

     Liabilities subject to compromise consists of pre-petition liabilities that
may be affected by a plan of reorganization. In accordance with AICPA Statement
of Position 90-7 "Financial Reporting by Entities in Reorganization under the
Bankruptcy Code", MobileMedia records liabilities subject to compromise based on
the expected amount of the allowed claims related to these liabilities.
Accordingly, in December 1998 and March 1999 MobileMedia reduced such
liabilities by approximately $10,461 and $3,050 (unaudited), respectively, to
reflect changes in estimated allowed claims.

  Restructuring Costs

     Restructuring costs are primarily comprised of professional fees
constituting administrative expenses incurred by MobileMedia as a result of
reorganization under Chapter 11 of the Bankruptcy Code.

  Income Taxes

     Income taxes are accounted for by the liability method in accordance with
Statement of Financial Accounting Standards No. 109, "Accounting for Income
Taxes".

  New Authoritative Accounting Pronouncements

     In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 131 "Disclosures about Segments of an
Enterprise and Related Information" ("SFAS No. 131"), which is effective for
years beginning after December 15, 1997. SFAS No. 131 establishes standards for
the way that public business enterprises report information about operating
segments in annual financial statements and requires that those enterprises
report selected information about operating segments in interim financial
reports. It also establishes standards for related disclosures about products
and services, geographic areas, and major customers. SFAS No. 131 is effective
for financial statements for fiscal years beginning after December 15, 1997.
MobileMedia has adopted SFAS No. 131 as of December 31, 1998. Such adoption did
not have an impact on MobileMedia's financial reporting.

     In April 1998, the Accounting Standards Executive Committee of the
Financial Accounting Standards Board issued Statement of Position 98-5 ("SOP
98-5") "Reporting on the Costs of Start-Up

                                      F-67
<PAGE>   272
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

Activities". SOP 98-5 requires costs of start-up activities and organization
costs to be expensed as incurred. Initial application of SOP 98-5 will be
reported as the cumulative effect of a change in accounting principle.
MobileMedia has adopted SOP 98-5 effective January 1, 1999. Such adoption did
not have any effect on MobileMedia's financial position or results of
operations.

3.  ACQUISITIONS AND DIVESTITURES

     On September 3, 1998, MobileMedia completed the sale of 166 transmission
towers to Pinnacle Towers, Inc. ("Pinnacle") for $170,000 in cash (the "Tower
Sale"). Under the terms of a lease with Pinnacle, MobileMedia will lease antenna
sites located on these towers for an initial period of 15 years at an aggregate
annual rental of $10,700. The sale was accounted for in accordance with
Statement of Financial Accounting Standards No. 28, Accounting for Sales with
Leasebacks, and resulted in a recognized gain of $94,200 and a deferred gain of
$70,000. The deferred gain will be amortized on a straight-line basis over the
initial lease period of 15 years. Subsequent to the sale, MobileMedia
distributed the $170,000 in proceeds to its secured creditors, who had a lien on
such assets.

     On January 4, 1996, MobileMedia completed its acquisition of MobileComm,
BellSouth's paging and wireless messaging unit, and an associated nationwide
2-way narrowband 50/12.5 kHz PCS license, and BellSouth agreed to enter into a
two-year non-compete agreement and a five-year reseller agreement with
MobileMedia (the "MobileComm Acquisition"). The aggregate consideration paid for
the MobileComm Acquisition (excluding fees and expenses and related financing
costs) was approximately $928,709.

     The MobileComm Acquisition has been accounted for as a purchase transaction
in accordance with Accounting Principles Board Opinion No. 16 and, accordingly,
the financial statements for the periods subsequent to January 4, 1996 reflect
the purchase price and transaction costs of $24,328, allocated to tangible and
intangible assets acquired and liabilities assumed based on their estimated fair
values as of January 4, 1996. The allocation of the purchase price is summarized
as follows:

<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
Current assets............................................      $  55,301
Property and equipment....................................        112,986
Intangible assets.........................................        934,269
Other assets..............................................            143
Liabilities assumed.......................................       (149,662)
                                                                ---------
                                                                $ 953,037
                                                                =========
</TABLE>

                                      F-68
<PAGE>   273
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

4.  PROPERTY AND EQUIPMENT

     Property and equipment are summarized as follows:

<TABLE>
<CAPTION>
                                              DECEMBER 31,
                                          --------------------     MARCH 31,
                                            1997        1998         1999
                                          --------    --------    -----------
                                             (IN THOUSANDS)       (UNAUDITED)
<S>                                       <C>         <C>         <C>
Pagers..................................  $196,791    $176,610      $190,903
Radio transmission equipment............   202,296     203,048       204,054
Computer equipment......................    30,896      32,679        32,866
Furniture and fixtures..................    20,918      22,019        21,187
Leasehold improvements..................    14,652      16,516        16,745
Construction in progress................     1,128      11,624        13,140
Land, buildings and other...............     7,911       6,697         6,591
                                          --------    --------      --------
                                           474,592     469,193       485,486
Accumulated depreciation................   216,655     249,551       259,920
                                          --------    --------      --------
Property and equipment, net.............  $257,937    $219,642      $225,566
                                          ========    ========      ========
</TABLE>

5.  INTANGIBLE ASSETS

<TABLE>
<CAPTION>
                                                     DECEMBER 31,                                     MARCH 31, 1999 (UNAUDITED)
                        -----------------------------------------------------------------------   ----------------------------------
                                       1997                                 1998
                        ----------------------------------   ----------------------------------
                                   ACCUMULATED                          ACCUMULATED                          ACCUMULATED
                          COST     AMORTIZATION     NET        COST     AMORTIZATION     NET        COST     AMORTIZATION     NET
                        --------   ------------   --------   --------   ------------   --------   --------   ------------   --------
<S>                     <C>        <C>            <C>        <C>        <C>            <C>        <C>        <C>            <C>
FCC Licenses..........  $261,323     $ (8,918)    $252,405   $261,523     $(16,891)    $244,632   $261,623     $(18,937)    $242,686
Customer lists........    64,430      (21,477)      42,953     64,430      (42,953)      21,477     64,430      (48,323)      16,107
                        --------     --------     --------   --------     --------     --------   --------     --------     --------
                        $325,753     $(30,395)    $295,358   $325,953     $(59,844)    $266,109   $326,053     $(67,260)    $258,793
                        ========     ========     ========   ========     ========     ========   ========     ========     ========
</TABLE>

     MobileMedia is not amortizing the cost of two nationwide Personal
Communications Services ("PCS") licenses, one acquired directly from the FCC and
the other as a result of the MobileComm acquisition, because the construction of
paging networks related to such licenses has not been completed. These networks
are expected to begin commercial operation in 1999 and, accordingly,
amortization of these licenses will begin at such time.

                                      F-69
<PAGE>   274
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

6.  DEBT

     Debt is summarized as follows:

<TABLE>
<CAPTION>
                                                           DECEMBER 31,
                                                       ---------------------    MARCH 31,
                                                          1997        1998        1999
                                                       ----------   --------   -----------
                                                                               (UNAUDITED)
<S>                                                    <C>          <C>        <C>
DIP credit facility..................................  $   10,000   $     --    $  5,000
Revolving loan.......................................      99,000     72,900      72,900
Term loan............................................     550,000    406,100     406,100
10 1/2% Senior Subordinated Deferred Coupon Notes due
  December 1, 2003...................................     174,125    174,125     174,125
9 3/8% Senior Subordinated Notes due November 1,
  2007...............................................     250,000    250,000     250,000
Dial Page Notes......................................       1,570      1,570       1,570
Note Payable.........................................         986        986         986
                                                       ----------   --------    --------
     Total debt......................................  $1,085,681   $905,681    $910,681
                                                       ==========   ========    ========
</TABLE>

     The debt obligations of MobileMedia include:

          1) A debtor-in-possession credit facility ("DIP Facility") with a
     syndicate of lenders including The Chase Manhattan Bank, as Agent (the "DIP
     Lenders"). As of March 31, 1999 there was $5,000 of borrowings outstanding
     under this facility, as of December 31, 1998 there were no funded
     borrowings and as of December 31, 1997, there was $10,000 of borrowings
     outstanding under this facility. MobileMedia is subject to certain
     financial and operating restrictions customary to credit facilities of this
     type including a limitation on periodic capital expenditures, minimum
     allowable periodic EBITDA and retention of a turnaround professional.
     Additionally, MobileMedia is required to make monthly interest payments to
     the DIP Lenders and pay a commitment fee of 0.5% on any unused portion of
     the DIP Facility. The DIP Facility bears interest at a rate of LIBOR plus
     250 basis points or Base Rate plus 150 basis points, at the option of
     MobileMedia. During 1997, the Debtors drew down $47,000 of borrowings and
     repaid $37,000 under the DIP Facility. During January and February, 1998
     the Debtors repaid an additional $10,000. On January 27, 1998, the DIP
     Facility was amended and reduced from $200,000 to $100,000. On August 12,
     1998, MobileMedia received approval from the Bankruptcy Court to extend the
     DIP Facility to March 31, 1999 and further reduce it from $100,000 to
     $75,000. MobileMedia has negotiated an extension of the DIP Facility
     through and including December 31, 1999.

          2) A $750,000 senior secured and guaranteed credit agreement (the
     "Pre-Petition Credit Agreement") with a syndicate of lenders including The
     Chase Manhattan Bank, as Agent. As of March 31, 1999 and December 31, 1998
     there was $479,000 outstanding under this facility consisting of term loans
     of $101,500 and $304,600 and loans under a revolving credit facility
     totaling $72,900. This agreement was entered into on December 4, 1995, in
     connection with the financing of the MobileComm Acquisition. Commencing in
     1996 MobileMedia was in default under this agreement. As a result of such
     default and the bankruptcy filing, MobileMedia has no borrowing capacity
     under this agreement. Since the Petition date, MobileMedia has brought
     current its interest payments and has been making monthly payments to the
     lenders under the Pre-Petition Credit Agreement equal to the amount of
     interest accruing under such agreement. On September 3, 1998, MobileMedia
     repaid $170,000 of borrowings under the Pre-Petition Credit Agreement with
     proceeds from the Tower Sale (see Note 3).

                                      F-70
<PAGE>   275
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

          3) $250,000 Senior Subordinated Notes due November 1, 2007 (the
     "9 3/8% Notes") issued in November 1995. These notes bear interest at a
     rate of 9 3/8% payable semi-annually on May 1 and November 1 of each year.
     On November 1, 1996, MobileMedia did not make its scheduled interest
     payment on its 9 3/8% Notes which constituted an event of default. The note
     holders have not exercised any rights or remedies afforded holders (which
     rights include, but are not limited to, acceleration of the liquidation
     maturity of the notes). Since the Petition date, any such right or remedy
     is subject to the automatic stay created by the Bankruptcy Code.

          4) $210,000 of Senior Subordinated Deferred Coupon Notes (the
     "Deferred Coupon Notes") issued, at a discount, in November 1993. The
     Deferred Coupon Notes accrete at a rate of 10 1/2%, compounded
     semi-annually, to an aggregate principal amount of $210,000 by December 1,
     1998 after which interest is paid in cash at a rate of 10 1/2% and is
     payable semi-annually. By virtue of the missed interest payments on the
     9 3/8% Notes and the Pre-Petition Credit Agreement an event of default has
     occurred. The note holders have not exercised any rights or remedies
     afforded such holders (which rights include, but are not limited to,
     acceleration of the stated maturity of the notes). Since the Petition date,
     any such right or remedy is subject to the automatic stay created by the
     Bankruptcy Code.

  Interest Expense on Debt

     Interest paid during the years ended December 31, 1996, 1997 and 1998, and
the three months ended March 31, 1998 and 1999 (unaudited) was $65,978, $70,817,
$51,560, $13,915 and $9,383 respectively. Total interest cost incurred for the
years ended December 31, 1996, 1997 and 1998 was $94,231, $68,409 and $53,982,
respectively of which $1,292, $176 and $228 was capitalized. Total interest cost
incurred for the three months ended March 31, 1998 and 1999 (unaudited), was
$14,793 and $10,248, respectively, of which $21 and $149 was capitalized.

     Subsequent to the Petition date, interest was accrued and paid only on the
Pre-Petition Credit Agreement and the DIP Facility. If not for the filing,
interest expense for the year ended December 31, 1997 and 1998 and March 31,
1998 and 1999 (unaudited), would have been approximately $104,152, $97,776,
$25,724 and $21,187, respectively.

7.  INCOME TAXES

     The components of income tax benefit (expense) are as follows:

<TABLE>
<CAPTION>
                                               YEAR ENDED DECEMBER 31,
                                            ------------------------------
                                             1996        1997       1998
                                            -------    --------    -------
<S>                                         <C>        <C>         <C>
Current:
     Federal..............................  $    --    $     --    $(1,757)
     State and local......................       --          --     (2,201)
                                            -------    --------    -------
                                                 --          --     (3,958)
  Deferred:
     Federal..............................   52,081          --         --
     State and local......................   17,361          --         --
                                            -------    --------    -------
          Total...........................  $69,442    $     --    $(3,958)
                                            =======    ========    =======
</TABLE>

                                      F-71
<PAGE>   276
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

     MobileMedia is included in the Parent's consolidated federal income tax
return. Income taxes are presented in the accompanying financial statements as
if MobileMedia filed tax returns as a separate consolidated entity.

     A reconciliation of income tax benefit (expense) and the amount computed by
applying the statutory federal income tax rate to loss before income taxes is as
follows:

<TABLE>
<CAPTION>
                                               YEAR ENDED DECEMBER 31,
                                           -------------------------------
                                             1996        1997       1998
                                           ---------   --------   --------
<S>                                        <C>         <C>        <C>
Tax benefit (expense) at federal
statutory rate...........................  $ 395,285   $ 43,604   $(13,838)
Goodwill and intangible amortization and
  writedown..............................    (95,362)        --         --
State income taxes.......................         --         --     (1,783)
Nondeductible expenses...................         --         --     (4,765)
Valuation allowance on federal deferred
  tax assets.............................   (230,481)   (43,604)    16,428
                                           ---------   --------   --------
          Total..........................  $  69,442   $     --   $ (3,958)
                                           =========   ========   ========
</TABLE>

     Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for federal and state income tax purposes. The
components of deferred tax liabilities are as follows:

<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                              ---------------------
                                                                1997        1998
                                                              ---------   ---------
<S>                                                           <C>         <C>
Deferred tax liabilities:
     Difference in book and tax basis of fixed assets.......  $  10,206   $  19,974
     Other..................................................         68          27
                                                              ---------   ---------
          Deferred tax liabilities..........................     10,274      20,001
Deferred tax assets:
     Tax credit carryforwards...............................         --       1,757
     Accounts receivable reserves...........................     10,578       6,000
     Differences between the book and tax basis of
       intangible assets....................................    128,462     121,526
     Difference between book and tax basis of accrued
       liabilities..........................................      5,089       4,794
     Net operating loss carryforward........................    161,840     135,458
     Deferred gain on tower sale............................         --      27,378
                                                              ---------   ---------
          Total deferred assets.............................    305,969     296,913
          Valuation allowances for deferred tax assets......   (298,350)   (279,567)
                                                              ---------   ---------
          Deferred tax assets...............................      7,619      17,346
                                                              =========   =========
          Net deferred tax liabilities......................  $   2,655   $   2,655
                                                              =========   =========
</TABLE>

     As of December 31, 1998, MobileMedia has available net operating loss
carryforwards for tax purposes of approximately $330,000 which expire in years
2008 through 2012. Utilization of these losses may be limited under Section 382
of the Internal Revenue Code.

     MobileMedia believes consummation of the public offering of 15,525,000
shares of Parent's Class A Common Stock on November 7, 1995 caused an ownership
change for MobileMedia for purposes of

                                      F-72
<PAGE>   277
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

Section 382 of the Code. As a result, the use of MobileMedia's pre-ownership
change net operating loss carryforwards will be limited annually by the Section
382 Limitation, which is estimated to be approximately $40,000. In addition, if
a second ownership change has occurred subsequent to November 7, 1995, which has
not yet been determined, use of MobileMedia's net operating losses would be
severely limited. It is also anticipated that the net operating loss
carryforwards and certain other tax attributes of MobileMedia will be
substantially reduced and their utilization significantly limited as a result of
consummation of the Plan.

8.  LEASES

     Certain facilities and equipment used in operations are held under
operating leases. Rental expenses under operating leases were $44,574, $43,453,
$40,936, $10,423 and $12,989 for the years ended December 31, 1996, 1997 and
1998 and the three months ended March 31, 1998 and 1999 (unaudited),
respectively. At December 31, 1998, the aggregate minimum rental commitments
under leases were as follows:

<TABLE>
<S>                                                           <C>
1999........................................................  $ 48,951
2000........................................................    25,457
2001........................................................    19,250
2002........................................................    15,726
2003........................................................    13,327
Thereafter..................................................    15,783
                                                              --------
                                                              $138,494
                                                              ========
</TABLE>

9.  EMPLOYEE BENEFIT PLANS

     MobileMedia has adopted a retirement savings plan that allows all employees
who have been employed for one year and have at least 1,000 hours of credited
service to contribute and defer up to 15% of their compensation. Effective
February 1, 1996, MobileMedia began a matching contribution of 50% of the first
2% of the elected deferral plus an additional 25% of the next 4% of the elected
deferral. MobileMedia's matching contribution was $700 in 1996, $730 in 1997 and
$692 in 1998 and $160 and $178 for the three months ended March 31, 1998 and
1999 (unaudited), respectively.

10.  STOCK OPTION PLANS

     MobileMedia has two stock option plans under which approximately 1.3
million options are currently outstanding. Under the proposed Plan of
Reorganization, MobileMedia's equity holders will receive no value for their
ownership interests in the Company, and accordingly, the options are also deemed
to have no value.

11.  COMMITMENTS AND CONTINGENCIES

     MobileMedia is party to a number of lawsuits and other matters arising in
the ordinary course of business.

     As announced on September 27, 1996 and October 21, 1996, MobileMedia
disclosed that misrepresentations and other violations had occurred during the
licensing process for as many as 400 to 500, or approximately 6% to 7%, of its
approximately 8,000 local transmission one-way paging stations. MobileMedia
caused an investigation to be conducted by its outside counsel, and a
comprehensive report regarding these matters was provided to the FCC in the fall
of 1996.

                                      F-73
<PAGE>   278
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

     On January 13, 1997, the FCC issued a Public Notice relating to the status
of certain FCC authorizations held by MobileMedia. Pursuant to the Public
Notice, the FCC announced that it had (i) automatically terminated approximately
185 authorizations for paging facilities that were not constructed by the
expiration date of their construction permits and remained unconstructed, (ii)
dismissed as defective approximately 94 applications for fill-in sites around
existing paging stations because they were predicated upon unconstructed
facilities and (iii) automatically terminated approximately 99 other
authorizations for paging facilities that were constructed after the expiration
date of their construction permits. However, the FCC granted MobileMedia interim
operating authority to operate transmitters in this last category subject to
further action by the FCC.

     On April 8, 1997, the FCC adopted an order commencing an administrative
hearing into the qualification of MobileMedia to remain a licensee. The order
directed an Administrative Law Judge to take evidence and develop a full factual
record on directed issues concerning MobileMedia's filing of false forms and
applications. MobileMedia was permitted to operate its licensed facilities and
provide service to the public during the pendency of the hearing.

     On June 6, 1997, the FCC issued an order staying the hearing proceeding in
order to allow MobileMedia to develop and consummate a plan of reorganization
that provides for a change of control of MobileMedia and a permissible transfer
of MobileMedia's FCC licenses. The grant of the stay was premised on the
availability of an FCC doctrine known as Second Thursday, which provides that,
if there is a change of control that meets certain conditions, the regulatory
issues designated for administrative hearing will be resolved by the transfer of
MobileMedia's FCC licenses to the new owners of MobileMedia and the hearing will
not proceed. The stay was originally granted for ten months and was extended by
the FCC through October 6, 1998.

     On September 2, 1998, MobileMedia and Arch Communications Group, Inc.
("Arch") filed a joint Second Thursday application. The FCC released an order
granting the application on February 5, 1999. The order, which is conditioned on
confirmation of the plan and consummation thereof within nine months, expressly
terminated the administrative hearing and resolved the issues designated
therein. The order denied the parties' request for permanent authority to
operate transmitters for which MobileMedia was granted interim authority on
January 13, 1997. If the Merger is consummated, Arch must cease operating these
facilities within 6 months after the merger. The order also denied the parties'
request for a waiver of the spectrum cap (which prohibits narrowband PCS
licensees from having ownership interest in more than three channels in any
geographic area). Arch must divest any excess channels within 6 months after the
merger.

     Prior to the Petition date, five actions allegedly arising under the
federal securities laws were filed against MobileMedia and certain of its
present and former officers, directors and underwriters in the United States
District Court for the District of New Jersey (the "New Jersey District Court").
These actions were subsequently consolidated as In re MobileMedia Securities
Litigation, No. 96-5723 (AJL) (the "New Jersey Actions"). A consolidated amended
complaint (the "Complaint") was filed on November 21, 1997. The Complaint does
not name MobileMedia as a defendant.

     In June 1997, the Debtors initiated an Adversary Proceeding in the
Bankruptcy Court to stay the prosecution of the New Jersey Actions. Pursuant to
a Stipulation entered into among the Debtors and the plaintiffs in the New
Jersey Actions and "So Ordered" by the Bankruptcy Court on October 31, 1997, the
plaintiffs in the New Jersey Actions could conduct only limited discovery in
connection with the New Jersey Actions and could not file any pleadings, except
responses to motions to dismiss, until the earlier of September 30, 1998 and the
effective date of a plan of reorganization. On October 21, 1998, the defendants'
motion to dismiss the New Jersey Actions filed with the New Jersey District
Court on January 16, 1998 was denied.
                                      F-74
<PAGE>   279
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

     In addition to the New Jersey Actions, two lawsuits (together, the
"California Actions" and, together with the New Jersey Actions, the "Securities
Actions") were filed in September 1997 in the United States District Court for
the Northern District of California and the Superior Court of California naming
as defendants certain former officers and certain present and former directors
of MobileMedia, certain investment entities and the Debtors' independent
auditors. None of the Debtors is named as defendant in the California Actions.

     On November 4, 1997, the Debtors commenced an adversary proceeding in the
Bankruptcy Court seeking to stay the prosecution of the California Actions
against the named defendants. At hearings held on December 10, 1997 and May 29,
1998, the Bankruptcy Court enjoined the plaintiffs in the California Actions
until September 15, 1998 from taking certain actions in connection with the
California Actions, with certain exceptions.

     The plaintiffs in both the New Jersey Actions and California Actions are
currently conducting discovery of MobileMedia in connection with their
prosecution of the actions against the named defendants. Following consummation
of the Plan of Reorganization, the Company may be subject to further discovery
in these proceedings.

     Neither the New Jersey Actions nor the California Actions name any of the
Debtors as a defendant. However, proofs of claim have been filed against the
Debtors by the plaintiffs in the New Jersey Actions, and both the New Jersey
Actions and the California Actions may give rise to claims against the Debtors'
Directors, Officers and Corporate Liability Insurance Policy. It is anticipated
that under any plan of reorganization for MobileMedia these Claims will receive
no distributions.

12.  OTHER INVESTMENTS

     On March 21, 1995, MobileMedia purchased a 33% interest in Abacus
Communications Partners, L.P., ("Abacus") a Delaware limited partnership, from
Abacus Business Services, Inc. for $1,641. Abacus Communications Partners, L.P.
is one of MobileMedia's alphanumeric dispatch services providers. The investment
has been accounted for under the equity method in accordance with Accounting
Principles Board Opinion No. 18. Under the equity method, original investments
are recorded at cost and adjusted by MobileMedia's share of undistributed
earnings or losses of the purchased company. MobileMedia's share of income
(loss) of affiliate, net of distribution, for the years ended December 31, 1996,
1997 and 1998, was $160, $69, and $(87), respectively. On December 30, 1998
MobileMedia reached an agreement to sell its interest in Abacus to Abacus
Exchange Inc. for $1,400 and subsequently completed the sale on January 25,
1999. Accordingly, MobileMedia wrote down its investment in Abacus from $1,612
to $1,400 as of December 31, 1998.

13.  IMPACT OF YEAR 2000 (UNAUDITED)

GENERAL

     Computer systems were originally designed to recognize calendar years by
the last two digits in the date code field. Beginning in the year 2000, these
date code fields will need to accept four digit entries to distinguish
twenty-first century dates from twentieth century dates. Any of MobileMedia's
computer programs that have time-sensitive software may recognize a date using
"00" as the year 1900 rather than the year 2000. This could result in a system
failure or miscalculations causing disruptions of operations, including, among
other things, a temporary inability to process transactions, send invoices, or
engage in similar normal business activities. As a result, in less than two
years, the computerized systems (including both information and non-information
technology systems) and applications used by MobileMedia will

                                      F-75
<PAGE>   280
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

need to be reviewed, evaluated and, if and where necessary, modified or replaced
to ensure that all financial, information and operating systems are Year 2000
compliant.

  State of Readiness

     MobileMedia has formed an internal task force comprised of representatives
of its various relevant departments to address Year 2000 compliance matters. The
task force has undertaken a preliminary review of internal and external areas
that are likely to be affected by Year 2000 compliance matters and has
classified the various areas as mission critical, important or
non-critical/non-important. MobileMedia also expects to hire outside consultants
to review MobileMedia's testing methodology and test results, to assess its
contingency planning and to provide general oversight relating to Year 2000
compliance matters.

     With respect to internal matters, MobileMedia has completed a review of its
hardware and software to determine whether its business-related applications
(including applications relating to distribution, finance, inventories,
operations, pager activation, purchasing and sales/marketing) will be Year 2000
compliant. In addition, in the last quarter of 1998, programs designed to
identify Year 2000 problems associated with dates embedded in certain
business-related files were created and executed to identify any Year 2000
compliance issues. The testing unearthed a few Year 2000 problems all of which
have been addressed and retested for Year 2000 readiness. Additional testing
took place the first quarter of 1999, which included testing of MobileMedia's
financial and human resource software packages. Although the results of these
tests are still being analyzed, relatively few Year 2000 problems were
identified. There can be no assurance, however, that such testing has detected,
or will detect, all compliance issues related to the Year 2000 problem.

     With respect to external matters, MobileMedia has distributed
questionnaires and requests for certification to its mission-critical vendors
and is in the process of obtaining and reviewing the responses thereto. The
questionnaires have requested information concerning embedded technologies of
such vendors, the hardware and software applications used by such vendors and
the Year 2000 compliance efforts of such vendors relating thereto.

  Estimated Year 2000 Compliance Costs

     MobileMedia has an information technology staff of approximately 68 people
that has addressed technical issues relating to Year 2000 compliance matters.
Through December 31, 1998, MobileMedia has incurred approximately $50 in costs
(excluding in-house labor and hardware) in connection with Year 2000 compliance
matters. In addition, MobileMedia has purchased upgraded hardware at a cost of
approximately $175 for use as redundant equipment in testing for Year 2000
problems in an isolated production environment. MobileMedia estimates that it
will expend approximately $500 on additional hardware, software and other items
related to the Year 2000 compliance matters.

     In addition, MobileMedia estimates that it will incur approximately $200 in
costs relating to Year 2000 remediation efforts for its paging network hardware.
MobileMedia also upgraded its paging network hardware during 1998 and plans
further upgrades in fiscal year 1999. Such upgrades have not been and are not
expected to be purchased solely for remediation of the Year 2000 compliance
problems; such upgrades are not themselves expected to have Year 2000 compliance
problems.

  Risks Relating to Year 2000 Compliance Matters

     MobileMedia has a goal to become Year 2000 compliant with respect to
internal matters during 1999. Although MobileMedia has begun testing of its
internal business-related hardware and software applications, there can be no
assurances that such testing will detect all applications that may be affected

                                      F-76
<PAGE>   281
               MOBILEMEDIA COMMUNICATIONS, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)

by Year 2000 compliance problems. With respect to external matters, due to the
multi-dependent and interdependent issues raised by Year 2000 compliance,
including many factors beyond its control, MobileMedia may face the possibility
that one or more of its mission-critical vendors, such as its utilities,
telephone carriers, equipment manufacturers or satellite carriers, may not be
Year 2000 compliant on a timely basis. Because of the unique nature of such
vendors, alternate providers may not be available. Finally, MobileMedia does not
manufacture any of the pagers, paging-related hardware or network equipment used
by MobileMedia or its customers in connection with MobileMedia's paging
operations. Although MobileMedia has tested such equipment, it has also relied
upon the representations of its vendors with respect to their Year 2000
readiness. MobileMedia can give no assurance as to the accuracy of such vendors'
representations.

  Contingency Planning

     MobileMedia has begun the process of assessing contingency plans that might
be available in the event of either internal or external Year 2000 compliance
problems. To this end, MobileMedia's various internal departments have begun to
prepare assessments of potential contingency alternatives. The task force will
undertake a review of these assessments on a department-by-department basis and
on a company-wide basis. MobileMedia intends to complete its contingency
planning during the second quarter of 1999.

                                      F-77
<PAGE>   282

                                                                         ANNEX A
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                          AGREEMENT AND PLAN OF MERGER
                                     AMONG
                             PAGING NETWORK, INC.,
                        ARCH COMMUNICATIONS GROUP, INC.
                                      AND
                          ST. LOUIS ACQUISITION CORP.

                          DATED AS OF NOVEMBER 7, 1999
                       AND AMENDED AS OF JANUARY 7, 2000

                                                                  COMPOSITE COPY

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   283

                               TABLE OF CONTENTS

                                   ARTICLE I.

                      The Merger; Closing; Effective Time

<TABLE>
<CAPTION>
                                                                     PAGE
                                                                     ----
<C>    <S>                                                           <C>
1.1.   The Merger..................................................   A-1
1.2.   Closing.....................................................   A-1
1.3.   Effective Time..............................................   A-1

                               ARTICLE II.
  Certificate of Incorporation and Bylaws of the Surviving Corporation

2.1.   The Certificate of Incorporation............................   A-2
2.2.   The Bylaws..................................................   A-2

                              ARTICLE III.
                          Directors & Officers

3.1.   Directors of Arch...........................................   A-2
3.2.   Directors of the Surviving Corporation......................   A-2
3.3.   Officers of the Surviving Corporation.......................   A-2

                               ARTICLE IV.
     Effect of the Merger on Capital Stock; Exchange of Certificates

4.1.   Effect on Capital Stock.....................................   A-2
4.2.   Exchange of Certificates for Shares.........................   A-3
4.3.   Dissenters' Rights..........................................   A-5
4.4.   Adjustments to Prevent Dilution.............................   A-5
4.5.   Alternate Transaction Structure.............................   A-5

                               ARTICLE V.
                     Representations and Warranties

5.1.   Representations and Warranties of PageNet, Arch and Merger     A-5
       Sub.........................................................

                               ARTICLE VI.
                                Covenants

6.1.   Interim Operations..........................................  A-16
6.2.   Acquisition Proposals.......................................  A-19
6.3.   The Certificate Amendments..................................  A-20
6.4.   Information Supplied........................................  A-20
6.5.   Stockholders Meetings.......................................  A-21
6.6.   Filings; Other Actions; Notification........................  A-22
6.7.   Access; Consultation........................................  A-24
</TABLE>

                                        i
<PAGE>   284

<TABLE>
<CAPTION>
                                                                     PAGE
                                                                     ----
<C>    <S>                                                           <C>
6.8.   Affiliates..................................................  A-24
6.9.   Stock Exchange Listing......................................  A-24
6.10.  Publicity...................................................  A-24
6.11.  Benefits....................................................  A-24
6.12.  Expenses....................................................  A-25
6.13.  Indemnification; Directors' and Officers' Insurance.........  A-25
6.14.  Takeover Statute............................................  A-26
6.15.  Confidentiality.............................................  A-27
6.16.  Tax-Free Reorganization.....................................  A-27
6.17.  Senior Credit Facilities....................................  A-27
6.18.  The Exchange Offers.........................................  A-27
6.19.  Bankruptcy Provisions.......................................  A-30
6.20.  Rights Agreement............................................  A-34
6.21.  Preferred Stock.............................................  A-35
6.22.  Spinoff.....................................................  A-35
                              ARTICLE VII.
                               Conditions
7.1.   Conditions to Each Party's Obligation to Effect the           A-35
       Merger......................................................
7.2.   Conditions to Obligations of Arch and Merger Sub............  A-37
7.3.   Conditions to Obligation of PageNet.........................  A-37
                              ARTICLE VIII.
                               Termination
8.1.   Termination by Mutual Consent...............................  A-38
8.2.   Termination by Either Arch or PageNet.......................  A-38
8.3.   Termination by PageNet......................................  A-39
8.4.   Termination by Arch.........................................  A-39
8.5.   Effect of Termination and Abandonment.......................  A-40
                               ARTICLE IX.
                        Miscellaneous and General
9.1.   Survival....................................................  A-41
9.2.   Modification or Amendment...................................  A-41
9.3.   Waiver of Conditions........................................  A-41
9.4.   Counterparts................................................  A-41
9.5.   Governing Law and Venue; Waiver of Jury Trial...............  A-42
9.6.   Notices.....................................................  A-42
9.7.   Entire Agreement............................................  A-43
9.8.   No Third Party Beneficiaries................................  A-43
9.9.   Obligations of Arch and of PageNet..........................  A-43
9.10.  Severability................................................  A-43
9.11.  Interpretation..............................................  A-43
</TABLE>

                                       ii
<PAGE>   285

<TABLE>
<CAPTION>
                                                                     PAGE
                                                                     ----
<C>    <S>                                                           <C>
9.12.  Captions....................................................  A-44
9.13.  Assignment..................................................  A-44
</TABLE>

<TABLE>
<S>                                                           <C>
                               Exhibits

Certificate of Incorporation of the Surviving Corporation...  Exhibit A
Arch Rights Agreement Amendment.............................  Exhibit B
PageNet Affiliates Agreement................................  Exhibit C
</TABLE>

                                       iii
<PAGE>   286

                             INDEX OF DEFINED TERMS

<TABLE>
<CAPTION>
TERM                                                          SECTION
- ----                                                          --------
<S>                                                           <C>
Acquisition Proposal........................................    6.2 (a)
Agreement...................................................  preamble
Alternative Merger..........................................    4.5
Alternative Merger Notice...................................    4.5
Arch........................................................  preamble
Arch Class B Common Stock...................................    5.1 (b)(ii)
Arch Common Stock...........................................    4.1 (a)
Arch Companies..............................................    4.1 (a)
Arch Conditions to the Prepackaged Plan.....................    6.19
Arch Disclosure Letter......................................    5.1
Arch Exchange Offer.........................................    6.18(a)
Arch Exchange Prospectus....................................    6.18(d)
Arch Exchange Registration Statement........................    6.18(d)
Arch Minimum Condition......................................    6.18(b)
Arch Notes..................................................    6.18(a)
Arch Preferred Shares.......................................    5.1 (b)(ii)
Arch Required Consents......................................    5.1 (d)(i)
Arch Requisite Vote.........................................    5.1 (c)(ii)
Arch Rights Agreement.......................................    5.1 (b)(ii)
Arch Series B Preferred Share...............................    5.1 (b)(ii)
Arch Series C Preferred Share...............................    5.1 (b)(ii)
Arch Stock Plans............................................    5.1 (b)(ii)
Arch Stockholders Approval..................................    6.5 (b)
Arch Stockholders Meeting...................................    6.5 (b)
Arch Termination Fee........................................    8.5 (c)
Audit Date..................................................    5.1 (f)
Bankruptcy and Equity Exception.............................    5.1 (c)(i)
Bankruptcy Case.............................................    6.19
Bankruptcy Code.............................................    6.19
Bankruptcy Court............................................    6.19
Bylaws......................................................    2.2
Certificate.................................................    4.1 (a)
Certificate Amendments......................................  recitals
Certificate of Merger.......................................    1.3
Charter.....................................................    2.1
Closing.....................................................    1.2
Closing Date................................................    1.2
Code........................................................  recitals
Communications Act..........................................    5.1 (d)(i)
Compensation and Benefit Plans..............................    5.1 (h)(i)
Confidentiality Agreement...................................    6.15
Contracts...................................................    5.1 (d)(ii)
Costs.......................................................    6.13(a)
</TABLE>

                                       iv
<PAGE>   287

<TABLE>
<CAPTION>
TERM                                                          SECTION
- ----                                                          --------
<S>                                                           <C>
Current Premium.............................................    6.13(c)
D&O Insurance...............................................    6.13(c)
Delaware Courts.............................................    9.5 (a)
DGCL........................................................    1.1
Disclosure Letter...........................................    5.1
Dismissal Order.............................................    6.19(a)(v)
Distributed Interests.......................................    6.22
Distributed Subsidiary......................................    6.22
Effective Time..............................................    1.3
Environmental Law...........................................    5.1 (n)
ERISA.......................................................    5.1 (h)(i)
ERISA Affiliate.............................................    5.1 (h)(i)
Exchange Act................................................    5.1 (b)(i)
Exchange Agent..............................................    4.2 (a)
Exchange Offers.............................................    6.18(a)
Exchange Offers Expiration Date.............................    6.18(h)
Exchange Ratio..............................................    4.1 (a)
Exchange Prospectus.........................................    6.18(d)
Exchange Registration Statements............................    6.18(d)
Excluded PageNet Shares.....................................    4.1 (a)
Exclusivity Provision.......................................    6.19(d)
Exit Financing..............................................    6.19
Extended Determination Date.................................    6.19(a)(iii)
FCC.........................................................    5.1 (d)(i)
FCC Regulations.............................................    5.1 (d)(i)
Final Confirmation Order....................................    6.19
Final Order.................................................    7.1 (c)
GAAP........................................................    5.1 (e)
Governmental Entity.........................................    5.1 (d)(i)
Governmental Regulations....................................    5.1 (d)(i)
Hazardous Substance.........................................    5.1 (n)
HSR Act.....................................................    5.1 (d)(i)
Indemnified Parties.........................................    6.13(a)
Indenture Amendments........................................    6.18(c)
Initial Determination Date..................................    6.19
Initial Merger Motion.......................................    6.19(d)
Initial Merger Order........................................    6.19(d)
Interim Financing...........................................    6.19
Involuntary Insolvency Event................................    6.19(a)(v)
Involuntary Insolvency Event Date...........................    6.19(a)(v)
IRS.........................................................    5.1 (h)(ii)
Knowledgeable Executives....................................    5.1 (g)
Laws........................................................    5.1 (i)
Material Adverse Effect.....................................    5.1 (a)
</TABLE>

                                        v
<PAGE>   288

<TABLE>
<CAPTION>
TERM                                                          SECTION
- ----                                                          --------
<S>                                                           <C>
Merger......................................................  recitals
Merger Consideration........................................    4.1 (a)
Merger Sub..................................................  preamble
NASDAQ......................................................    6.9
Note Consents...............................................    6.18(b)
Note Waivers................................................    6.18(c)
Notes.......................................................    6.18(a)
Notes Exchange Agent........................................    6.18(i)
Order.......................................................    7.1 (d)
PageNet.....................................................  preamble
PageNet Affiliates Agreement................................    6.8
PageNet Conditions to the Prepackaged Plan..................    6.19
PageNet Disclosure Letter...................................    5.1
PageNet Exchange Offer......................................    6.18(a)
PageNet Exchange Prospectus.................................    6.18(d)
PageNet Minimum Condition...................................    6.18(b)
PageNet Notes...............................................    6.18(a)
PageNet Option..............................................    6.11(a)(i)
PageNet Required Consents...................................    5.1 (d)(i)
PageNet Rights Agreement....................................    5.1 (b)(i)
PageNet Secured Creditors...................................    6.17
PageNet Share...............................................    4.1 (a)
PageNet Stock Plans.........................................    5.1 (b)(i)
PageNet Stockholders Approval...............................    6.5 (a)
PageNet Stockholders Meeting................................    6.5 (a)
PageNet Termination Fee.....................................    8.5 (b)
Pension Plan................................................    5.1 (h)(ii)
Permits.....................................................    5.1 (i)
Person......................................................    4.2 (a)
Prepackaged Plan............................................    6.19
Prospectus/Proxy Statement..................................    6.4
PUC.........................................................    5.1 (d)(i)
Reports.....................................................    5.1 (e)
Representatives.............................................    6.2 (a)
Requisite Bankruptcy Vote of the PageNet Notes..............    6.19
Requisite Bankruptcy Vote of the PageNet Secured
  Creditors.................................................    6.19
Requisite Conditions to the Prepackaged Plan................    6.19
Rule 145 Affiliates.........................................    6.8
S-4 Registration Statement..................................    6.4
SEC.........................................................    5.1 (e)
Section 16 Person...........................................    6.11(a)(iii)
Securities Act..............................................    5.1 (d)(i)
Series C Consent Agreement..................................    6.21(a)
Series C Consideration......................................    6.21(a)
</TABLE>

                                       vi
<PAGE>   289

<TABLE>
<CAPTION>
TERM                                                          SECTION
- ----                                                          --------
<S>                                                           <C>
Series C Exchange Ratio.....................................    6.21(a)
Significant Investees.......................................    5.1 (d)(ii)
Significant Subsidiaries....................................    5.1 (b)(i)
Spinoff.....................................................    6.22
Spinoff Dividend............................................    6.22
Spinoff Record Date.........................................    6.22
State Laws..................................................    5.1 (d)(i)
Subsidiary..................................................    5.1 (a)
Substitute Option...........................................    6.11(a)(i)
Superior Proposal...........................................    6.2 (a)
Surviving Corporation.......................................    1.1
Takeover Statute............................................    5.1 (j)
Tax.........................................................    5.1 (l)
Tax Return..................................................    5.1 (l)
Taxable.....................................................    5.1 (l)
Termination Date............................................    8.2
</TABLE>

                                       vii
<PAGE>   290

                          AGREEMENT AND PLAN OF MERGER

     This AGREEMENT AND PLAN OF MERGER ("Agreement"), dated as of November 7,
1999 and amended as of January 7, 2000, is among Paging Network, Inc., a
Delaware corporation ("PageNet"), Arch Communications Group, Inc., a Delaware
corporation ("Arch"), and St. Louis Acquisition Corp., a Delaware corporation
that is a wholly owned subsidiary of Arch ("Merger Sub").

                                    RECITALS

     WHEREAS, the respective Boards of Directors of each of Arch, Merger Sub and
PageNet have approved, recommended and declared advisable this Agreement and the
merger of Merger Sub with and into PageNet (the "Merger") upon the terms and
subject to the conditions set forth in this Agreement;

     WHEREAS, the parties hereto intend, by executing and delivering this
Agreement, to adopt a plan of reorganization within the meaning of Section
368(a) of the Internal Revenue Code of 1986, as amended (the "Code"), and to
cause the Merger and the other transactions which are part of this plan of
reorganization to qualify as a "reorganization" as therein defined;

     WHEREAS, the Arch Board of Directors has approved, recommended and declared
advisable certain amendments to its Certificate of Incorporation to effectuate
the actions described herein (the "Certificate Amendments"), contemporaneously
upon and in connection with the Merger;

     WHEREAS, Arch, Merger Sub and PageNet desire to make certain
representations, warranties, covenants and agreements in connection with this
Agreement.

     NOW, THEREFORE, in consideration of the premises, and of the
representations, warranties, covenants and agreements contained in this
Agreement, the parties hereto agree as follows:

                                   ARTICLE I.

                      THE MERGER; CLOSING; EFFECTIVE TIME

     1.1.  The Merger.  Upon the terms and subject to the conditions set forth
in this Agreement, at the Effective Time (as defined in Section 1.3), Merger Sub
shall be merged with and into PageNet and the separate corporate existence of
Merger Sub shall thereupon cease. PageNet shall be the surviving corporation in
the Merger (sometimes referred to as the "SURVIVING CORPORATION") and shall
continue to be governed by the laws of the State of Delaware, and the separate
corporate existence of PageNet with all its rights, privileges, immunities,
powers and franchises shall continue unaffected by the Merger, except as set
forth in Article III of this Agreement. The Merger shall have the effects
specified in the Delaware General Corporation Law, as amended (the "DGCL").

     1.2.  Closing.  The closing of the Merger (the "Closing") shall take place:
(i) at the offices of Hale and Dorr LLP, 60 State Street, Boston, Massachusetts,
at 9:00 A.M., local time, on the second business day after the date on which the
last to be fulfilled or waived of the conditions set forth in Article VII (other
than those conditions that by their nature are to be satisfied at the Closing,
but subject to the fulfillment or waiver of those conditions) shall be satisfied
or waived in accordance with this Agreement; or (ii) at such other place and
time and/or on such other date as Arch and PageNet may agree in writing (the
"Closing Date").

     1.3.  Effective Time.  At the Closing, Arch and PageNet will cause a
Certificate of Merger (the "Certificate of Merger") to be executed,
acknowledged, and filed with the Secretary of State of the State of Delaware as
provided in Section 251 of the DGCL. The Merger shall become effective at the
time when the Certificate of Merger has been duly filed with the Secretary of
State of the State of Delaware or such other later time as shall be agreed upon
by the parties and set forth in the Certificate of Merger in accordance with the
DGCL (the "Effective Time").

                                       A-1
<PAGE>   291

                                  ARTICLE II.

      CERTIFICATE OF INCORPORATION AND BYLAWS OF THE SURVIVING CORPORATION

     2.1.  The Certificate of Incorporation.  The certificate of incorporation
of PageNet, amended and restated in its entirety as set forth in Exhibit A,
shall be the certificate of incorporation of the Surviving Corporation (the
"Charter"), until duly amended as provided therein or by applicable law.

     2.2.  The Bylaws.  The bylaws of Merger Sub, as in effect immediately prior
to the Effective Time, shall be the bylaws of the Surviving Corporation (the
"Bylaws"), until thereafter amended as provided therein or by applicable law.

                                  ARTICLE III.

                              DIRECTORS & OFFICERS

     3.1.  Directors of Arch.  Arch shall take all actions necessary (subject to
applicable law and any necessary stockholder approval) to cause, at the
Effective Time, the number of directors comprising the full Board of Directors
of Arch to be comprised of twelve directors, six of which shall be nominated by
the Board of Directors of Arch, and six of which shall be nominated by the Board
of Directors of PageNet, each such person to serve from the Effective Time until
his or her successor has been duly elected and qualified, or until his or her
earlier death, resignation, or removal in accordance with the Charter and the
Bylaws; provided, however, that of the six directors nominated by the Board of
Directors of PageNet, one shall be designated by each of the three holders of
PageNet Notes holding the greatest percentage in aggregate principal amount of
the PageNet Notes; and if and to the extent that any such holder declines to
make such designation, the number of directors nominated by the Board of
Directors of PageNet shall be decreased and the number of directors nominated by
the Board of Directors of Arch shall be increased. The directors nominated by
PageNet shall be divided as nearly evenly as is possible among the classes of
directors of Arch.

     3.2.  Directors of the Surviving Corporation.  The directors of Merger Sub
at the Effective Time shall, from and after the Effective Time, be the directors
of the Surviving Corporation until his or her successor has been duly elected
and qualified, or until his or her earlier death, resignation, or removal in
accordance with the Charter and the Bylaws;

     3.3.  Officers of the Surviving Corporation.  The officers of PageNet at
the Effective Time shall at the Effective Time, be the officers of the Surviving
Corporation until his or her successor has been duly elected and qualified, or
until their earlier death, resignation, or removal in accordance with the
Charter and the Bylaws.

                                  ARTICLE IV.

        EFFECT OF THE MERGER ON CAPITAL STOCK; EXCHANGE OF CERTIFICATES

     4.1.  Effect on Capital Stock.  At the Effective Time, the Merger shall
have the following effects on the capital stock of Arch, Merger Sub and PageNet,
without any action on the part of the holder of any capital stock of Arch,
Merger Sub or PageNet:

          (a) Merger Consideration.  Each share of common stock, par value $0.01
     per share, of PageNet (each, a "PageNet Share") issued and outstanding
     immediately prior to the Effective Time (excluding PageNet Shares
     (collectively, "Excluded PageNet Shares") that are owned by Arch, Merger
     Sub or any direct or indirect, wholly owned subsidiary of Arch or Merger
     Sub (collectively, the "Arch Companies")), shall be converted into and
     become exchangeable for 0.1247 of a share (the "Exchange Ratio") of common
     stock, par value $0.01 per share, of Arch (the "Arch Common Stock"),
     subject to adjustment as provided in Section 4.4, (the "Merger
     Consideration"). At the Effective Time, all PageNet Shares shall no longer
     be outstanding, shall be canceled and retired and shall cease to exist, and
     each certificate (a "Certificate") formerly representing any of such
     PageNet

                                       A-2
<PAGE>   292

     Shares (other than Excluded PageNet Shares) shall thereafter represent only
     the right to receive the Merger Consideration and the right, if any, to
     receive a distribution or dividend pursuant to Section 4.2(b)(i), in each
     case without interest, or to vote pursuant to Section 4.2(b)(ii).

          (b) Cancellation of Excluded PageNet Shares.  At the Effective Time,
     each Excluded PageNet Share shall no longer be outstanding, shall be
     canceled and retired without payment of any consideration therefor, and
     shall cease to exist.

          (c) Merger Sub Capital Stock.  At the Effective Time, each share of
     Common Stock, par value $0.01 per share, of Merger Sub issued and
     outstanding immediately prior to the Effective Time shall be converted into
     one share of common stock of the Surviving Corporation, and the Surviving
     Corporation shall thereby become a wholly owned subsidiary of Arch.

     4.2.  Exchange of Certificates for Shares.

          (a) Exchange Procedures.  Promptly after the Effective Time, Arch
     shall cause its transfer agent or another exchange agent selected by Arch
     with PageNet's prior approval (the "Exchange Agent"), which shall not be
     unreasonably withheld, to mail to each holder of record as of the Effective
     Time of a Certificate: (i) a letter of transmittal specifying that delivery
     of the Certificates shall be effected, and that risk of loss and title to
     the Certificates shall pass, only upon delivery of the Certificates (or
     affidavits of loss in lieu thereof) to the Exchange Agent in accordance
     with the terms and conditions of such letter of transmittal, such letter of
     transmittal to be in such form and have such other provisions as Arch and
     PageNet may reasonably agree; and (ii) instructions for exchanging the
     Certificates for: (A) certificates representing shares of Arch Common
     Stock; and (B) any unpaid dividends and other distributions due to such
     holder with respect to such shares, including, with respect to holders of
     PageNet Shares at the Spinoff Record Date (as defined in Section 6.22), the
     Distributed Interests (as defined in Section 6.22). Subject to Section
     4.2(g), upon proper surrender of a Certificate for cancellation (or
     affidavits of loss in lieu thereof) to the Exchange Agent together with
     such letter of transmittal, duly executed, the holder of such Certificate
     shall be entitled to receive in exchange therefor: (x) a certificate
     representing that number of shares of Arch Common Stock that such holder is
     entitled to receive pursuant to this Article IV and, with respect to
     PageNet Shares at the Spinoff Record Date, certificates representing the
     Distributed Interests that such holder is entitled pursuant to Section
     6.22; and (y) a check in the amount (after giving effect to any required
     tax withholdings) of any dividends or other distributions that such holder
     has the right to receive pursuant to the provisions of this Article IV. The
     Certificate so surrendered shall forthwith be canceled. No interest will be
     paid or accrued on any amount payable upon due surrender of any
     Certificate. In the event of a transfer of ownership of PageNet Shares that
     is not registered in the transfer records of PageNet, a certificate
     representing the proper number of shares of Arch Common Stock and, with
     respect to PageNet Shares at the Spinoff Record Date, certificates
     representing the Distributed Interests, together with a check for any
     dividends or distributions with respect thereto, may be issued and/or paid
     to such a transferee if the Certificate formerly representing such PageNet
     Shares is presented to the Exchange Agent, accompanied by all documents
     required to evidence and effect such transfer and to evidence that all
     applicable stock transfer taxes have been paid. If any certificate for
     shares of Arch Common Stock is to be issued in a name other than that in
     which the Certificate surrendered in exchange therefor is registered, it
     shall be a condition of such exchange that the Person (as defined below)
     requesting such exchange shall pay all transfer and other taxes required by
     reason of the issuance of certificates for shares of Arch Common Stock
     and/or Distributed Interests in a name other than that of the registered
     holder of the Certificate surrendered, or shall establish to the
     satisfaction of Arch or the Exchange Agent that such tax has been paid or
     is not applicable.

                                       A-3
<PAGE>   293

     The term "Person" means any individual, corporation (including
not-for-profit), general or limited partnership, limited liability company,
joint venture, estate, trust, association, organization, Governmental Entity (as
defined in Section 5.1(d)(i)), or other entity of any kind or nature.

          (b) Distributions with Respect to Unexchanged Shares; Voting.

             (i) Whenever a dividend or other distribution is declared by Arch
        with respect to Arch Common Stock, the record date for which is at or
        after the Effective Time, that declaration shall include dividends or
        other distributions with respect to all shares of Arch Common Stock
        issuable pursuant to this Agreement. No dividends or other distributions
        with respect to such Arch Common Stock shall be paid to any holder of
        any unsurrendered Certificate until such Certificate is surrendered for
        exchange in accordance with this Article IV. Subject to the effect of
        applicable Laws, following surrender of any such Certificate, there
        shall be issued or paid to the holder of the certificates representing
        shares of Arch Common Stock issued in exchange therefor, without
        interest: (A) at the time of such surrender, the dividends or other
        distributions with a record date after the Effective Time and a payment
        date on or prior to the date of issuance of such shares of Arch Common
        Stock and not previously paid; and (B) at the appropriate payment date,
        the dividends or other distributions payable with respect to such shares
        of Arch Common Stock with a record date after the Effective Time and
        prior to the date of issuance of such shares of Arch Common Stock but
        with a payment date subsequent to surrender. For purposes of dividends
        or other distributions with respect to shares of Arch Common Stock, all
        such shares to be issued pursuant to the Merger shall be deemed issued
        and outstanding as of the Effective Time.

             (ii) At any meeting of stockholders of Arch with a record date at
        or after the Effective Time, registered holders of unsurrendered
        Certificates shall be entitled to vote the number of shares of Arch
        Common Stock represented by such Certificates, regardless of whether
        such holders have exchanged their Certificates; provided, however, that
        any such vote shall be at the times, upon the conditions, and in the
        manner prescribed by the certificate of incorporation and bylaws of
        Arch.

          (c) Transfers.  From and after the Effective Time, there shall be no
     transfers of PageNet Shares or Arch Series C Preferred Shares that were
     outstanding immediately prior to the Effective Time recorded on the stock
     transfer books of PageNet or Arch, as the case may be.

          (d) Fractional Shares.  Notwithstanding any other provision of this
     Agreement to the contrary, no certificates or scrip representing fractional
     shares of Arch Common Stock will be issued in the Merger, but in lieu
     thereof, each holder of Certificates otherwise entitled to a fractional
     share of Arch Common Stock will be entitled to receive, from the Exchange
     Agent in accordance with the provisions of this Section 4.2(d), a cash
     payment in lieu of such fractional shares of Arch Common Stock determined
     by multiplying such fraction (rounded to the nearest one-hundredth of a
     share) by the average closing price of a share of Arch Common Stock, as
     reported in The Wall Street Journal, New York City edition, on the ten (10)
     days immediately prior to the Effective Time. As soon as practicable after
     the determination of the amount of cash, if any, to be paid to the holders
     of Certificates in lieu of any fractional shares of Arch Common Stock, the
     Exchange Agent shall make available such amounts of cash to such holders of
     Certificates, without interest thereon.

          (e) Termination of Exchange Period; Unclaimed Stock.  Any shares of
     Arch Common Stock, and any portion of the dividends or other distributions
     with respect to the Arch Common Stock deposited by Arch with the Exchange
     Agent (including the proceeds of any investments thereof) that remain
     unclaimed by the holders of Certificates 180 days after the Effective Time
     shall be re-delivered to Arch. Any holders of Certificates who have not
     theretofore complied with this Article IV shall thereafter be entitled to
     look only to the Surviving Corporation for exchange of shares of Arch
     Common Stock, and any dividends and other distributions with respect
     thereto issuable and/or payable pursuant to Section 4.1, Section 4.2(b),
     and Section 4.2(d) upon due surrender of their Certificates (or affidavits
     of loss in lieu thereof), in each case, without any interest thereon.

                                       A-4
<PAGE>   294

     Notwithstanding the foregoing, none of Arch, the Exchange Agent, nor any
     other Person shall be liable to any former holder of Certificates for any
     amount properly delivered to a public official pursuant to applicable
     abandoned property, escheat or similar laws.

          (f) Lost, Stolen or Destroyed Certificates.  In the event any
     Certificate shall have been lost, stolen or destroyed, upon the making of
     an affidavit of that fact by the Person claiming such Certificate to be
     lost, stolen or destroyed, and the posting by such Person of a bond in the
     form customarily required by Arch as indemnity against any claim that may
     be made against it with respect to such Certificate, Arch will issue the
     shares of Arch Common Stock and the Exchange Agent will issue stock and any
     dividends and other distributions with respect thereto issuable or payable
     in exchange for such lost, stolen, or destroyed Certificate pursuant to
     Section 4.1, Section 4.2(b) and Section 4.2(d), in each case, without
     interest.

          (g) Affiliates.  Notwithstanding anything in this Agreement to the
     contrary, Certificates surrendered for exchange by any Rule 145 Affiliate
     (as determined pursuant to Section 6.8) of PageNet shall not be exchanged
     until Arch has received a written agreement from such Person as provided in
     Section 6.8.

     4.3.  Dissenters' Rights.  In accordance with Section 262 of the DGCL, no
appraisal rights will be available to holders of PageNet Shares in connection
with the Merger.

     4.4.  Adjustments to Prevent Dilution.  In the event that prior to the
Effective Time, solely as a result of a distribution, reclassification, stock
split (including a reverse split), stock dividend or stock distribution, or
other similar transaction, there is a change in the number of PageNet Shares,
Arch Series C Preferred Shares, Arch Common Stock, or securities convertible or
exchangeable into, or exercisable for, PageNet Shares, Arch Series C Preferred
Shares or Arch Common Stock issued and outstanding, the Exchange Ratio and the
Series C Exchange Ratio shall be equitably adjusted to eliminate the effects of
such event.

     4.5.  Alternate Transaction Structure.  At any time prior to the
effectiveness of the S-4 Registration Statement (as defined herein), either Arch
or PageNet may notify the other party (the "Alternative Merger Notice") that it
desires to restructure the Merger or the other transactions contemplated hereby
in a manner contemplated to (i) increase the likelihood that the Merger would be
treated as a tax-free reorganization within the meaning of Section 368(a) of the
Code, (ii) decrease any potential tax liability of PageNet, Arch or the
Surviving Corporation after the Effective Time, (iii) provide greater
operational flexibility to Arch and the Surviving Corporation after the
Effective Time, or (iv) increase the number of PageNet Shares (or Distributed
Interests) offered to holders of PageNet Notes or the number of shares of Arch
Common Stock offered to holders of Arch Notes in the Exchange Offers (with a
corresponding reduction in the number of shares offered to the holders of
PageNet Shares (or Distributed Interests) or the holders of Arch Common Stock,
respectively). Upon delivery of the Alternative Merger Notice, the parties to
this Agreement shall cooperate with each other and use their respective
reasonable best efforts to determine the manner in which the Merger, the
Agreement and the transactions contemplated hereby shall be restructured (the
Merger, restructured as contemplated by the parties pursuant to this Section
4.5, shall be referred to herein as the "Alternative Merger"). With the written
consent of each of the parties to this Agreement (such consent not to be
unreasonably withheld), the Merger, this Agreement and the other transactions
contemplated hereby may be modified to reflect the Alternative Merger with a
view to ensuring that the parties hereto are not adversely affected by the
restructuring.

                                   ARTICLE V.

                         REPRESENTATIONS AND WARRANTIES

     5.1.  Representations and Warranties of PageNet, Arch and Merger Sub.
Except as set forth in the corresponding sections or subsections of the
respective disclosure letters, dated as of the date of this Agreement, and
delivered by PageNet to Arch or by Arch to PageNet (each a "Disclosure Letter,"
and the "Pagenet Disclosure Letter" and the "Arch Disclosure Letter,"
respectively), as the case may be,

                                       A-5
<PAGE>   295

PageNet (except for subparagraphs (b)(ii), (c)(ii), (j)(ii) and (o)(ii) below
and references in subparagraphs (a) and (e) below to documents made available by
Arch to PageNet) represents and warrants to Arch and Merger Sub, and Arch, on
behalf of itself and Merger Sub (except for subparagraphs (b)(i), (c)(i),
(j)(i), and (o)(i) below, and references in subparagraphs (a) and (e) below to
documents made available by PageNet to Arch) represents and warrants to PageNet,
that:

          (a) Organization, Good Standing and Qualification.  Each of it and its
     Subsidiaries is a corporation duly organized, validly existing, and in good
     standing under the laws of its respective jurisdiction of organization and
     has all requisite corporate or similar power and authority to own and
     operate its properties and assets and to carry on its business as presently
     conducted, and is qualified to do business and is in good standing as a
     foreign corporation in each jurisdiction where the ownership or operation
     of its properties or conduct of its business requires such qualification,
     except when the failure to be so qualified or in good standing, when taken
     together with all other such failures, is not reasonably likely to have a
     Material Adverse Effect (as defined below) on it. It has made available to
     Arch, in the case of PageNet, and to PageNet, in the case of Arch, a
     complete and correct copy of its certificate of incorporation and bylaws,
     each as amended to date. Such certificates of incorporation and bylaws are
     in full force and effect.

     The term "Subsidiary" means, with respect to PageNet or Arch, as the case
may be, any entity, whether incorporated or unincorporated, of which at least a
majority of the securities or other ownership interests having by their terms
ordinary voting power to elect at least a majority of the Board of Directors or
other persons performing similar functions is directly or indirectly owned by
such party.

     The term "Material Adverse Effect" means, with respect to any Person, a
material adverse effect on the business, assets (including licenses, franchises
and other intangible assets), financial condition and results of operations of
such Person and its Subsidiaries, taken as a whole; provided, however, that
Material Adverse Effect shall exclude any effect resulting from, or related to,
changes or developments involving: (1) a prospective change arising out of any
proposed or adopted legislation, or any other proposal or enactment by any
governmental, regulatory, or administrative authority; (2) general conditions
applicable to the U.S. economy, including changes in interest rates; or (3)
conditions affecting the U.S. wireless telecommunications industry, in each case
taken as a whole.

     Reference to "the other party" means, with respect to PageNet, Arch and
means, with respect to Arch, PageNet.

          (b) Capital Structure.

          (i) The authorized capital stock of PageNet consists of 250,000,000
     PageNet Shares, of which 103,960,240 PageNet Shares were issued and
     outstanding and no PageNet Shares were held in treasury as of the close of
     business on November 5, 1999, and 25,000,000 shares of preferred stock, of
     which no shares were issued and outstanding as of the close of business on
     November 5, 1999. All of the outstanding PageNet Shares have been duly
     authorized and are validly issued, fully paid and nonassessable. There are
     no PageNet Shares reserved for issuance pursuant to the Stockholder Rights
     Agreement, dated as of September 8, 1994, between PageNet and The First
     National Bank of Boston, as Rights Agent, as amended (the "PageNet Rights
     Agreement"), and PageNet Shares subject to issuance as set forth below, as
     of the date of this Agreement, and PageNet has no PageNet Shares or
     preferred stock reserved for, or subject to, issuance. As of November 5,
     1999, there were 9,887,588 PageNet Shares that PageNet was obligated to
     issue pursuant to PageNet's stock plans, at a weighted average exercise
     price of $9.2637 per PageNet Share, and each of such plans is listed in
     Section 5.1(b)(i) of the PageNet Disclosure Letter (collectively, the
     "PageNet Stock Plans"). Each of the outstanding shares of capital stock or
     other securities of each of PageNet's "Significant Subsidiaries" (as
     defined in Rule 1.02(w) of Regulation S-X promulgated pursuant to the
     Securities Exchange Act of 1934, as amended (the "Exchange Act"), including
     any Subsidiaries that, if aggregated, would together constitute a
     Significant Subsidiary) is duly authorized, validly issued, fully paid and
     nonassessable and owned by PageNet or a direct or indirect wholly owned
     subsidiary of PageNet, free and clear of any lien, pledge, security
     interest, claim or other encumbrance. Except as

                                       A-6
<PAGE>   296

     set forth above, as of the date of this Agreement there are no preemptive
     or other outstanding rights, options, warrants, conversion rights, stock
     appreciation rights, redemption rights, repurchase rights, agreements,
     arrangements or commitments to issue or to sell any shares of capital stock
     or other securities of PageNet or any of its Significant Subsidiaries or
     any securities or obligations convertible or exchangeable into, or
     exercisable for, or giving any Person a right to subscribe for or acquire,
     any securities of PageNet or any of its Significant Subsidiaries, and no
     securities or obligation evidencing such rights are authorized, issued or
     outstanding. As of the date hereof, PageNet does not have outstanding any
     bonds, debentures, notes or other debt obligations, the holders of which
     have the right to vote (or convertible into or exercisable for securities
     having the right to vote) with the stockholders of PageNet on any matter.
     No PageNet Shares are held by a Subsidiary of PageNet.

          (ii) The authorized capital stock of Arch consists of 65,000,000
     shares of Arch Common Stock, of which 45,837,186 shares of Arch Common
     Stock were issued and outstanding and no shares of Arch Common Stock were
     held in treasury as of the close of business on November 5, 1999,
     10,000,000 shares of Class B common stock, par value $0.01 per share, of
     Arch (the "Arch Class B Common Stock") of which 5,360,261 shares of Arch
     Class B Common Stock were issued and outstanding as of the close of
     business on November 5, 1999, and 10,000,000 shares of preferred stock, of
     which (x) 250,000 were designated Series C Convertible Preferred Stock, par
     value $0.01 per share (each a "Arch Series C Preferred Share"), of which
     250,000 shares were issued and outstanding as of the close of business on
     November 5, 1999, and (y) 300,000 shares of which were designated Series B
     Junior Participating Preferred Stock, par value $0.01 per share (each a
     "Arch Series B Preferred Share," collectively the "Arch Series B Preferred
     Shares"), none of which were outstanding as of the close of business on
     November 5, 1999 (the Arch Series B Preferred Shares together with the Arch
     Series C Preferred Shares, the "Arch Preferred Shares"). All of the
     outstanding shares of Arch Common Stock, Arch Class B Common Stock and Arch
     Preferred Shares have been duly authorized and are validly issued, fully
     paid and nonassessable. Other than 300,000 Arch Series B Preferred Shares
     reserved for issuance pursuant to the Rights Agreement, dated as of October
     13, 1995, between Arch and The Bank of New York, as Rights Agent, as
     amended (the "Arch Rights Agreement"), and Arch Common Stock subject to
     issuance as set forth below, and Arch Preferred Shares, Arch has not
     authorized, issued, or reserved for issuance any common stock, preferred
     stock, or other shares of capital stock as of the date of this Agreement.
     As of November 5, 1999, there were 1,834,253 shares of Arch Common Stock
     that Arch was obligated to issue pursuant to Arch' stock plans, at a
     weighted average exercise price of $10.18 per share of Arch Common Stock,
     each of such plans is listed in Section 5.1(b)(ii) of the Arch Disclosure
     Letter (collectively the "Arch Stock Plans"), and 5,902,702 shares of Arch
     Common Stock that Arch was obligated to issue pursuant to outstanding
     warrants having an expiration date of September 1, 2001 and an effective
     exercise price of $9.03 per Share of Arch Common Stock. As of the date
     hereof, each outstanding Arch Series C Preferred Share is convertible into
     6.7444 shares of Arch Common Stock. Each of the outstanding shares of
     capital stock or other securities of each of Arch' Significant Subsidiaries
     is duly authorized, validly issued, fully paid and nonassessable and owned
     by Arch or a direct or indirect wholly owned Subsidiary of Arch, free and
     clear of any lien, pledge, security interest, claim, or other encumbrance.
     Except as set forth above and except pursuant to the Arch Series B
     Preferred Shares or the Arch Series C Preferred Shares, there are no
     preemptive or other outstanding rights, options, warrants, conversion
     rights, stock appreciation rights, redemption rights, repurchase rights,
     agreements, arrangements or commitments to issue or sell any shares of
     capital stock or other securities of Arch or any of its Significant
     Subsidiaries or any securities or obligations convertible or exchangeable
     into, or exercisable for, or giving any Person a right to subscribe for or
     acquire, any securities of Arch or any of its Significant Subsidiaries, and
     no securities or obligations evidencing such rights are authorized, issued
     or outstanding. Arch does not have outstanding any bonds, debentures, notes
     or other debt obligations, the holders of which have the right to vote (or
     convertible into or exercisable for securities having the right to vote)
     with the stockholders of Arch on any matter. No shares of Arch Common Stock
     or Arch Preferred Shares are held by a Subsidiary of Arch. The authorized
     capital stock of Merger Sub consists of 1,000 shares of Common Stock, par

                                       A-7
<PAGE>   297

     value $0.01 per share, all of which are validly issued and outstanding. All
     of the issued and outstanding capital stock of Merger Sub is, and at the
     Effective Time will be, owned by Arch, and there are (i) no other shares of
     capital stock or other voting securities of Merger Sub, (ii) no securities
     of Merger Sub convertible into or exchangeable for shares of capital stock
     or other voting securities of Merger Sub and (iii) no options or other
     rights to acquire from Merger Sub, and no obligations of Merger Sub to
     issue, any capital stock, other voting securities or securities convertible
     into or exchangeable for capital stock or other voting securities of Merger
     Sub. Merger Sub has not conducted any business prior to the date of this
     Agreement and has no, and prior to the Effective Time will have no, assets,
     liabilities or obligations of any nature other than those incident to its
     formation and pursuant to this Agreement and the Merger and the other
     transactions contemplated by this Agreement.

          (c) Corporate Authority; Approval and Fairness.

          (i) PageNet has all requisite corporate power and authority and has
     taken all corporate action necessary in order to execute, deliver and
     perform its obligations under this Agreement and, subject only to adoption
     of this Agreement and approval of the Merger and the amendment to the
     PageNet certificate of incorporation to increase the number of PageNet
     Shares authorized to the amount sufficient to complete the transactions
     contemplated by this Agreement by the holders of a majority of the PageNet
     Shares in accordance with applicable law and PageNet's bylaws and charter
     and to the receipt of PageNet Required Consents (as defined in Section
     5.1(d)(i)), to consummate the Merger. This Agreement has been duly executed
     and delivered by PageNet and is a valid and binding agreement of PageNet,
     enforceable against PageNet in accordance with its terms, subject to
     bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and
     similar laws of general applicability relating to or affecting creditors'
     rights and to general equity principles (the "Bankruptcy and Equity
     Exception"). The Board of Directors of PageNet: (A) has unanimously
     approved and declared advisable this Agreement and the other transactions
     contemplated by this Agreement; and (B) has received the opinion of each of
     its financial advisors, Houlihan Lokey Howard & Zukin Capital, Goldman,
     Sachs & Co. and Morgan Stanley Dean Witter, in a customary form and to the
     effect that the Merger Consideration and the Distributed Interests, taken
     as a whole, to be received by the holders of PageNet Shares, on the date of
     such opinion, is fair to such holders from a financial point of view. The
     PageNet Shares when issued pursuant to the PageNet Exchange Offer (as
     defined in Section 6.18(a)), will be validly issued, fully paid and
     nonassessable, and no stockholder of PageNet will have any preemptive right
     of subscription or purchase with respect thereto.

          (ii) Arch and Merger Sub each has all requisite corporate power and
     authority and has taken all corporate action necessary in order to execute,
     deliver and perform its obligations under this Agreement and the Series C
     Consent Agreement and, subject only to adoption of the Certificate
     Amendments (or this Agreement and the Alternative Merger if Arch is a party
     to the Alternative Merger) and the other transactions contemplated by this
     Agreement pursuant to this Agreement by a majority of the votes of the Arch
     Common Stock and Arch Series C Preferred Shares voting together and a
     majority of the votes of the Arch Series C Preferred Shares (for certain of
     the Certificate Amendments) in accordance with applicable law and Arch
     certificate of incorporation and bylaws (the "Arch Requisite Vote"), and to
     the receipt of the Arch Required Consents (as defined in Section
     5.1(d)(i)), to consummate the Merger. This Agreement has been duly executed
     and delivered by Arch and Merger Sub and is a valid and binding agreement
     of Arch and Merger Sub, enforceable against Arch and Merger Sub in
     accordance with its terms, subject to the Bankruptcy and Equity Exception.
     The Board of Directors of Arch: (A) has unanimously approved and declared
     advisable this Agreement and the Series C Consent Agreement and the other
     transactions contemplated by this Agreement and the Series C Consent
     Agreement; and (B) has received the opinion of its financial advisor, Bear,
     Stearns & Co. Inc., in a customary form and to the effect that the Exchange
     Ratio, as of the date of such opinion, is fair to the public stockholders
     of Arch from a financial point of view. The shares of Arch Common Stock,
     when issued pursuant to this Agreement

                                       A-8
<PAGE>   298

     or the Arch Exchange Offer, will be validly issued, fully paid and
     nonassessable, and no stockholder of Arch will have any preemptive right of
     subscription or purchase with respect thereto.

          (d) Government Filings; No Violations.

          (i) Other than the filings, notices and/or approvals: (A) pursuant to
     Section 1.3 of this Agreement, or, in connection with the Bankruptcy Case
     and the Prepackaged Plan, the Final Confirmation Order; (B) under the
     Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the "HSR
     Act"), the Exchange Act, and the Securities Act of 1933, as amended (the
     "Securities Act"); (C) of the Federal Communications Commission (the "FCC")
     pursuant to the Communications Act of 1934, as amended (the "Communications
     Act"), or the rules, regulations, and policies of the FCC (the "FCC
     Regulations"); (D) of any state public utility commissions or similar state
     regulatory bodies (each, a "PUC") identified in its respective Disclosure
     Letter pursuant to applicable state laws (as defined in Section 5.1(i))
     regulating the paging or other telecommunications business ("State Laws");
     (E) to comply with state securities or "blue-sky" laws; and (F) of any
     local, state or federal governmental authorities required for a change in
     ownership of transmission sites (all of such filings and/or notices of Arch
     being referred to as the "Arch Required Consents" and of PageNet being
     referred to as the "PageNet Required Consents"), no notices, reports or
     other filings are required to be made by it with, nor are any consents,
     registrations, approvals, permits or authorizations required to be obtained
     by it from, any governmental or regulatory authority, court, agency,
     commission, body or other governmental entity ("Governmental Entity"), in
     connection with the execution and delivery of this Agreement by it and the
     consummation by it of the Merger and the other transactions contemplated by
     this Agreement, except those that the failure to make or obtain are not,
     individually or in the aggregate, reasonably likely to have a Material
     Adverse Effect on it or prevent, materially delay or materially impair its
     ability to (x) consummate the transactions contemplated by this Agreement
     or (y) operate its business following the Effective Time.

     The term "Governmental Regulations" includes the HSR Act, the
Communications Act, the FCC Regulations, State Laws, and any other antitrust,
competition, or telecommunications Law of the United States of America or any
other nation, province, territory or jurisdiction that must be satisfied or
complied with in order to consummate and make effective the Merger and the other
transactions contemplated by this Agreement.

          (ii) The execution, delivery and performance of this Agreement by it
     do not, and the consummation by it of the Merger and the other transactions
     contemplated by this Agreement will not, constitute or result in: (A) a
     breach or violation of, or a default under, its certificate of
     incorporation or bylaws or the comparable governing instruments of any of
     its Significant Subsidiaries or any entity in which it has an equity
     interest of 20% or more (collectively, with Significant Subsidiaries,
     "Significant Investees"); (B) a breach or violation of, or a default under,
     the acceleration of any obligations or the creation of a lien, pledge,
     security interest or other encumbrance on its assets or the assets of any
     of its Significant Investees (with or without notice, lapse of time or
     both) pursuant to, any agreement, lease, contract, note, mortgage,
     indenture, arrangement or other obligation ("Contracts") binding upon it or
     any of its Significant Investees or any Law or governmental or
     non-governmental permit or license to which it or any of its Significant
     Investees is subject or is a party; or (C) any change in the rights or
     obligations of any party under any Contracts to which it or any of its
     Significant Investees is subject or is a party, except for such defaults,
     breaches, violations or accelerations as may result from the Bankruptcy
     Case or the Prepackaged Plan, and except, in the case of clauses (B) or (C)
     above for any breach, violation, default, acceleration, creation or change
     that, individually or in the aggregate, is not reasonably likely to have a
     Material Adverse Effect on it or prevent, materially delay or materially
     impair its ability to (x) consummate the transactions contemplated by this
     Agreement or (y) operate its business following the Effective Time. The
     PageNet Disclosure Letter, with respect to PageNet, and the Arch Disclosure
     Letter, with respect to Arch, sets forth a correct and complete list of
     Contracts to which it or any of its Significant Investees is a party,
     pursuant to which consents or waivers are or may be required prior to
     consummation of the transactions contemplated by this Agreement, other than
     as

                                       A-9
<PAGE>   299

     may be required in connection with the Bankruptcy Case or the Prepackaged
     Plan, or those where the failure to obtain such consents or waivers is not,
     individually or in the aggregate, reasonably likely to have a Material
     Adverse Effect on it or prevent or materially impair its (x) ability to
     consummate the transactions contemplated by this Agreement or (y) operate
     its business following the Effective Time.

          (e) Reports; Financial Statements.  It has made available to the other
     party each registration statement, report, proxy statement or information
     statement prepared by it since December 31, 1996, including without
     limitation its Annual Report on Form 10-K for the years ended December 31,
     1996, December 31, 1997 and December 31, 1998 in the form (including
     exhibits, annexes and any amendments thereto) filed with the Securities and
     Exchange Commission (the "SEC") (collectively, including any such reports
     filed subsequent to the date of this Agreement, its "Reports"). As of their
     respective dates, its Reports complied, as to form, with all applicable
     requirements under the Securities Act, the Exchange Act, and the rules and
     regulations thereunder, and (together with any amendments thereto filed
     prior to the date hereof) did not contain any untrue statement of a
     material fact or omit to state a material fact required to be liquidation
     therein or necessary to make the statements made therein, in light of the
     circumstances in which they were made, not misleading. Each of the
     consolidated balance sheets included in, or incorporated by reference into,
     its Reports (including the related notes and schedules) fairly presents the
     consolidated financial position of it and its Subsidiaries as of its date
     and each of the consolidated statements of income, stockholders' equity,
     and of cash flows included in, or incorporated by reference into, its
     Reports (including any related notes and schedules) fairly presents the
     consolidated results of operations, retained earnings and cash flows, as
     the case may be, of it and its Subsidiaries for the periods set forth
     therein (subject, in the case of unaudited statements, to notes and normal
     year-end audit adjustments that will not be material in amount or effect),
     in each case in accordance with generally accepted accounting principles
     ("GAAP") consistently applied during the periods involved, except as may be
     noted therein. It has made available to the other party all correspondence
     since December 31, 1996 between it or its representatives, on the one hand,
     and the SEC, on the other hand. To its knowledge, as of the date of this
     Agreement, there are no pending or threatened SEC inquiries or
     investigations relating to it or any of its Reports. To its knowledge and
     except as disclosed in its Reports or in filings by its holders with the
     SEC, as of the date of this Agreement, no Person or "group" "beneficially
     owns" 5% or more of its outstanding voting securities, with the terms
     "beneficially owns" and "group" having the meanings ascribed to them under
     Rule 13d-3 and Rule 13d-5 under the Exchange Act.

          (f) Absence of Certain Changes.  Except as disclosed in its Reports
     filed prior to the date of this Agreement or as expressly contemplated by
     this Agreement, since December 31, 1998 (the "Audit Date"), it and its
     Subsidiaries have conducted their respective businesses only in, and have
     not engaged in any material transaction other than according to, the
     ordinary and usual course of such businesses and there has not been: (i)
     any change in the business, assets (including licenses, franchises and
     other intangible assets), financial condition and results of operations of
     it and its Subsidiaries, except those changes that are not, individually or
     in the aggregate, reasonably likely to have a Material Adverse Effect on
     it; (ii) any damage, destruction or other casualty loss with respect to any
     asset or property owned, leased or otherwise used by it or any of its
     Subsidiaries, whether or not covered by insurance, which damage,
     destruction or loss is reasonably likely, individually or in the aggregate,
     to have a Material Adverse Effect on it; (iii) any declaration, setting
     aside or payment of any dividend or other distribution with respect to its
     capital stock; or (iv) any change by it in accounting principles, practices
     or methods, except as required by GAAP. Since the Audit Date, except as
     provided for in this Agreement, in its respective Disclosure Letter, or as
     disclosed in its Reports filed prior to the date of this Agreement, there
     has not been any increase in the salary, wage, bonus, grants, awards,
     benefits or other compensation payable or that could become payable by it
     or any of its respective Subsidiaries, to directors, officers or key
     employees as identified in the corresponding section of each party's
     Disclosure Letter or any amendment of any of its Compensation and Benefit
     Plans (as defined in Section 5.1(h)(i)), other than increases or amendments
     in the ordinary and usual course of its business (which may include normal
     periodic performance reviews

                                      A-10
<PAGE>   300

     and related compensation and benefit increases and the provision of new
     individual compensation and benefits for promoted or newly hired officers
     and employees on terms consistent with past practice).

          (g) Litigation and Liabilities.  Except as disclosed in its Reports
     filed prior to the date of this Agreement, there are no: (x) (i) civil,
     criminal or administrative actions, suits, claims, hearings, investigations
     or proceedings pending or, to the actual knowledge of its executive
     officers identified in the corresponding section of each party's Disclosure
     Letter ("Knowledgeable Executives"), threatened against it or any of its
     Affiliates (as defined in Rule 12b-2 under the Exchange Act); or (ii)
     obligations or liabilities, whether or not accrued, contingent or
     otherwise, and whether or not required to be disclosed, including those
     relating to matters involving any Environmental Law, or (y) any other facts
     or circumstances, in any such case, of which the Knowledgeable Executives
     have actual knowledge and that are reasonably likely to result in any
     claims against or obligations or liabilities of it or any of its
     Affiliates, except, in the case of (x) or (y), those that are not,
     individually or in the aggregate, reasonably likely to have a Material
     Adverse Effect on it or prevent, materially delay or materially impair its
     ability to consummate the transactions contemplated by this Agreement.

          (h) Employee Benefits.

             (i) Neither it nor any of its respective ERISA Affiliates (as
        defined below) maintains, is a party to, participates in, or has any
        liability or contingent liability with respect to, any employee benefit
        plan (within the meaning of Section 3(3) of the Employee Retirement
        Income Security Act of 1974, as amended ("ERISA"), or any bonus,
        deferred compensation, pension, retirement, profit-sharing, thrift,
        savings, employee stock ownership, stock bonus, change-of-control, stock
        purchase, restricted stock, stock option, employment, consulting,
        termination, severance, compensation, medical, health or fringe benefit
        plan, or other plan, program, agreement, policy or arrangement for any
        of its agents, consultants, employees, directors, former employees or
        former directors and/or any of its respective ERISA Affiliates which
        does not constitute an employee benefit plan under ERISA (which employee
        benefit plans and other plans, programs, agreements, policies and
        arrangements are collectively referred to as the "Compensation and
        Benefit Plans"). A true and correct copy of each Compensation and
        Benefit Plan which have been reduced to writing and, to the extent
        applicable, copies of the most recent annual report, actuarial report,
        accountant's opinion of the plan's financial statements, summary plan
        description and Internal Revenue Service determination letter with
        respect to any Compensation and Benefit Plans and any trust agreements
        or insurance contracts forming a part of such Compensation and Benefit
        Plans has been made available by PageNet and Arch to the other party
        prior to the date of this Agreement. In the case of any Compensation and
        Benefit Plan which is not in written form, PageNet and Arch has supplied
        to the other party an accurate description of such Compensation and
        Benefit Plan as in effect on the date of this Agreement. For purposes of
        this Agreement, the term "ERISA Affiliate" means any corporation or
        trade or business which, together with PageNet or Arch, as applicable,
        is a member of a controlled group of Persons or a group of trades or
        businesses under common control with PageNet or Arch, as applicable,
        within the meaning of Sections 414(b), (c), (m) or (o) of the Code.

             (ii) All Compensation and Benefit Plans, other than a multiemployer
        plan (as defined in Section 3(37) of ERISA), are in substantial
        compliance with all requirements of applicable law, including the Code
        and ERISA and no event has occurred which will or could cause any such
        Compensation and Benefit Plan to fail to comply with such requirements
        and no notice has been issued by any governmental authority questioning
        or challenging such compliance. There have been no acts or omissions by
        it or any of its respective ERISA Affiliates, which have given rise to
        or may give rise to material fines, penalties, taxes or related charges
        under Section 502 of ERISA or Chapters 43, 47, 68 or 100 of the Code for
        which PageNet, Arch, as applicable, or any of its respective ERISA
        Affiliates may be liable. Each of the Compensation and Benefit Plans
        that is an "employee pension benefit plan" within the meaning of Section
        3(2) of ERISA, other than a multiemployer plan (each a "Pension Plan"),
        and that is intended to be qualified under Section 401(a) of the Code
        has received a favorable determination letter from the Internal

                                      A-11
<PAGE>   301

        Revenue Service (the "IRS") which covers all changes in law for which
        the remedial amendment period (within the meaning of Section 401(b) of
        the Code and applicable regulations) has expired and neither it, nor any
        of its respective ERISA Affiliates is aware of any circumstances
        reasonably likely to result in revocation of any such favorable
        determination letter. There is no pending or, to the actual knowledge of
        PageNet's or Arch', as applicable, Knowledgeable Executives, threatened
        material litigation relating to its Compensation and Benefit Plans.
        Neither it, nor any of its respective ERISA Affiliates, has engaged in a
        transaction with respect to any of the Compensation and Benefit Plans
        that, assuming the taxable period of such transaction expired as of the
        date of this Agreement, would subject it or any of the ERISA Affiliates
        to a material tax or penalty imposed by either Section 4975 of the Code
        or Section 502 of ERISA.

             (iii) As of the date of this Agreement, no liability under Title IV
        of ERISA (other than the payment of prospective premium amounts to the
        Pension Benefit Guaranty Corporation in the normal course) has been or
        is expected to be incurred by it or any of its respective ERISA
        Affiliates with respect to any Compensation and Benefit Plan. No notice
        of a "reportable event," within the meaning of Section 4043 of ERISA for
        which the 30-day reporting requirement has not been waived, has been
        required to be filed for any Pension Plans within the 12-month period
        ending on the date of this Agreement or will be required to be filed in
        connection with the transactions contemplated by this Agreement.

             (iv) All contributions required to be made under the terms of any
        of the Compensation and Benefit Plans as of the date of this Agreement
        have been timely made or have been reflected on the most recent
        consolidated balance sheet filed or incorporated by reference in its
        Reports prior to the date of this Agreement. None of the Pension Plans
        has an "accumulated funding deficiency" (whether or not waived) within
        the meaning of Section 412 of the Code or Section 302 of ERISA. Neither
        it, nor any of its respective ERISA Affiliates has provided, or is
        required to provide, security to any Pension Plans pursuant to Section
        401(a)(29) of the Code or to the PBGC pursuant to Title IV or ERISA.

             (v) Under each of the Pension Plans as of the last day of the most
        recent plan year ended prior to the date of this Agreement, the
        actuarially determined present value of all "benefit liabilities,"
        within the meaning of Section 4001(a)(16) of ERISA (as determined on the
        basis of the actuarial assumptions contained in such Pension Plan's most
        recent actuarial valuation), did not exceed the then current value of
        the assets of such Pension Plan, and there has been no material change
        in the financial condition of such Pension Plan since the last day of
        the most recent plan year.

             (vi) Neither it, nor any of its respective ERISA Affiliates, have
        any obligations for post-termination health and life benefits under any
        of the Compensation and Benefit Plans, except as set forth in its
        Reports filed prior to the date of this Agreement or as required by
        applicable law.

             (vii) The consummation of the Merger (or the approval thereof by
        its respective stockholders) and the other transactions contemplated by
        this Agreement, will not (except as may result from, or be contemplated
        by, the Bankruptcy Case or the Prepackaged Plan): (x) entitle any of its
        employees or directors or any employees of any of its ERISA Affiliates,
        as applicable, to severance pay, directly or indirectly, upon
        termination of employment or otherwise; (y) accelerate the time of
        payment or vesting or trigger any payment of compensation or benefits
        under, or increase the amount payable or trigger any other material
        obligation pursuant to, any of the Compensation and Benefit Plans; or
        (z) result in any breach or violation of, or a default under, any of the
        Compensation and Benefit Plans.

             (viii) None of the Compensation and Benefit Plans is a
        multiemployer plan and neither it, nor any of its respective ERISA
        Affiliates, have contributed or been obligated to contribute to a
        multiemployer plan at any time.

          (i) Compliance with Laws. Except as set forth in its Reports filed
     prior to the date of this Agreement, the businesses of each of it and its
     Subsidiaries have not been, and are not being,

                                      A-12
<PAGE>   302

     conducted in violation of any law, statute, ordinance, regulation,
     judgment, order, decree, injunction, arbitration award, license,
     authorization, opinion, agency requirement or permit of any Governmental
     Entity or common law (collectively, "Laws"), except for violations or
     possible violations that are not, individually or in the aggregate,
     reasonably likely to have a Material Adverse Effect on it or prevent,
     materially delay or materially impair its ability to consummate the
     transactions contemplated by this Agreement. Except as set forth in its
     Reports filed prior to the date of this Agreement, no investigation or
     review by any Governmental Entity with respect to it or any of its
     Subsidiaries is pending or, to the actual knowledge of the Knowledgeable
     Executives, threatened, nor has any Governmental Entity indicated an
     intention to conduct the same, except for those the outcome of which are
     not, individually or in the aggregate, reasonably likely to have a Material
     Adverse Effect on it or prevent, materially delay or materially impair its
     ability to consummate the transactions contemplated by this Agreement. To
     the actual knowledge of the Knowledgeable Executives, no material change is
     required in its or any of its Subsidiaries' processes, properties or
     procedures in connection with any such Laws, and it has not received any
     notice or communication of any material noncompliance with any such Laws
     that has not been cured as of the date of this Agreement, except for such
     changes and noncompliance that are not, individually or in the aggregate,
     reasonably likely to have a Material Adverse Effect on it or prevent,
     materially delay or materially impair its ability to consummate the
     transactions contemplated by this Agreement. Each of it and its
     Subsidiaries has all permits, licenses, franchises, variances, exemptions,
     orders, operating rights, and other governmental authorizations, consents
     and approvals (collectively, "Permits"), necessary to conduct their
     business as presently conducted, except for those the absence of which are
     not, individually or in the aggregate, reasonably likely to have a Material
     Adverse Effect on it or prevent, materially delay or materially impair its
     ability to consummate the transactions contemplated by this Agreement.

          (j) Takeover Statutes; Charter and Bylaw Provisions.

             (i) The PageNet Board of Directors has taken all appropriate and
        necessary actions to exempt the Merger, this Agreement and the other
        transactions contemplated hereby from the restrictions of Section 203 of
        the DGCL. No other "control share acquisition," "fair price,"
        "moratorium" or other anti-takeover laws or regulations enacted under
        U.S. liquidation or federal laws (each a "Takeover Statute") apply to
        the Merger, this Agreement, or any of the other transactions
        contemplated hereby. PageNet and the PageNet Board of Directors have
        taken all appropriate and necessary actions to (A) render the PageNet
        Rights Agreement inapplicable to the Merger and the other transactions
        contemplated by this Agreement, (B) provide that (I) neither Arch nor
        Merger Sub shall be deemed an Acquiring Person (as defined in the
        PageNet Rights Agreement) as a result of this Agreement or the
        transactions contemplated hereby and thereby, (II) no Distribution Date
        (as defined in the PageNet Rights Agreement) shall be deemed to have
        occurred as a result of this Agreement or the transactions contemplated
        hereby and (III) the rights issuable pursuant to the PageNet Rights
        Agreement will not separate from the shares of PageNet Common Stock, as
        a result of the approval, execution or delivery of this Agreement or the
        consummation of the transactions contemplated hereby, and (C) render any
        anti-takeover or other provision contained in the certificate of
        incorporation or by-laws of PageNet inapplicable to the Merger, this
        Agreement and the other transactions contemplated hereby.

             (ii) The Arch Board of Directors has taken all appropriate and
        necessary actions to exempt the Merger, this Agreement and the
        transactions contemplated hereby from the restrictions of Section 203 of
        the DGCL. No other Takeover Statute applies to this Agreement or any of
        the transactions contemplated hereby. Arch and the Arch Board of
        Directors have taken all appropriate and necessary actions to (A) amend
        the Arch Rights Agreement as set forth in Exhibit B to this Agreement,
        (B) provide that (I) PageNet shall not be deemed an Acquiring Person (as
        defined in the Arch Rights Agreement) as a result of this Agreement or
        the transactions contemplated thereby, (II) no Distribution Date (as
        defined in the Arch Rights Agreement) shall be deemed to have occurred
        as a result of this Agreement or the transactions contemplated thereby
        unless the ownership threshold set forth in Exhibit B shall be exceeded,
        and (III) the rights issuable pursuant to the Arch

                                      A-13
<PAGE>   303

        Rights Agreement will not separate from the shares of Arch Common Stock,
        as a result of the approval, execution or delivery of this Agreement or
        the consummation of the transactions contemplated hereby unless the
        ownership threshold set forth in Exhibit B shall be exceeded, and (C)
        render any anti-takeover or other provision contained in the certificate
        of incorporation or by-laws of Arch inapplicable to the Merger, this
        Agreement and the other transactions contemplated hereby.

          (k) Tax Matters.  As of the date of this Agreement, neither it nor any
     of its Subsidiaries has taken or agreed to take any action, nor do the
     Knowledgeable Executives have any actual knowledge of any fact or
     circumstance (excluding possible uncertainties regarding valuation of
     securities to be issued in the Merger and Exchange Offers), that would
     prevent the Merger and the other transactions contemplated by this
     Agreement from qualifying as a "reorganization" within the meaning of
     Section 368(a) of the Code.

          (l) Taxes.  It and each of its Subsidiaries have prepared in good
     faith and duly and timely filed (taking into account any extension of time
     within which to file) all material Tax Returns required to be filed by any
     of them at or before the Effective Time and all such filed Tax Returns are
     complete and accurate in all material respects. It and each of its
     Subsidiaries as of the Effective Time: (x) will have paid all Taxes and
     estimated Taxes (including all amounts shown to be due on all filed Tax
     Returns) that they are required to pay prior to the Effective Time; and (y)
     will have withheld or collected all federal, state and local income taxes,
     FICA, FUTA and other Taxes, including, without limitation, similar foreign
     Taxes, required to be withheld from amounts owing to any employee,
     creditor, or third party, and to the extent required, will have paid such
     amounts to the proper governmental authority. As of the date of this
     Agreement, (i) there are not pending or threatened in writing, any audits,
     examinations, investigations or other proceedings with respect to Taxes or
     Tax matters, and (ii) there are not, to the actual knowledge of its
     Knowledgeable Executives, any unresolved questions, claims or outstanding
     proposed or assessed deficiencies concerning its or any of its
     Subsidiaries' Tax liability which, if determined adversely would have a
     Material Adverse Effect on it. Neither it nor any of its Subsidiaries has
     any liability with respect to income, franchise or similar Taxes in excess
     of the amounts accrued with respect to such Taxes that are reflected in the
     financial statements included in its Reports. Neither it nor any of its
     Subsidiaries has executed any waiver of any statute of limitations on, or
     extended the period for the assessment or collection of, any Tax. There are
     no tax liens (other than liens for current Taxes not yet due and payable)
     upon its assets or the assets of any Subsidiary. There is no "Section 382
     limitation," as defined in Section 382(b) of the Code, currently applicable
     to its or its Subsidiaries' net operating loss, investment credit, or other
     tax attribute carryforwards. Neither it nor any of its Subsidiaries: (A) is
     a party to any tax sharing agreement; or (B) is liable for the Tax
     obligations of any person other than it or one of its Subsidiaries.

     The term "Tax" (including, with correlative meaning, the terms "Taxes," and
"Taxable") includes all federal, state, local and foreign income, profits,
franchise, gross receipts, environmental, customs duty, capital stock,
severance, stamp, payroll, sales, employment, unemployment, disability, use,
property, withholding, excise, production, value added, occupancy and other
taxes, duties, charges, fees, or assessments of any nature whatsoever, together
with all interest, penalties and additions imposed with respect to such amounts
and any interest with respect to such penalties and additions. The term "Tax
Return" includes all federal, state, local and foreign returns and reports
(including elections, declarations, disclosures, schedules, estimates and
information returns) required to be supplied to a Tax authority relating to
Taxes.

          (m) Labor Matters.  Neither it nor any of its Subsidiaries is the
     subject of any material proceeding asserting that it or any of its
     Subsidiaries has committed an unfair labor practice or is seeking to compel
     it to bargain with any labor union or labor organization, nor is there
     pending or, to the actual knowledge of its Knowledgeable Executives,
     threatened, nor has there been for the past five years, any labor strike,
     dispute, walkout, work stoppage, slow-down or lockout involving it or any
     of its Subsidiaries, except in each case as is not, individually or in the
     aggregate, reasonably likely to have a Material Adverse Effect on it. None
     of the employees of PageNet or Arch or any of their respective

                                      A-14
<PAGE>   304

     Subsidiaries is subject to a collective bargaining agreement, no collective
     bargaining agreement is currently being negotiated, and no attempt is
     currently being made or during the past three (3) years has been made to
     organize any of its employees to form or enter into any labor union or
     similar organization.

          (n) Environmental Matters.  Except as disclosed in its Reports filed
     prior to the date of this Agreement and except for such matters that,
     individually or in the aggregate, are not reasonably likely to have a
     Material Adverse Effect on it: (i) each of it and its Subsidiaries has
     complied with all applicable Environmental Laws; (ii) the properties
     currently owned or operated by it or any of its Subsidiaries (including
     soils, groundwater, surface water, buildings, or other structures) do not
     contain any Hazardous Substances; (iii) the properties formerly owned or
     operated by it or any of its Subsidiaries did not contain any Hazardous
     Substances during the period of ownership or operation by it or any of its
     Subsidiaries; (iv) neither it nor any of its Subsidiaries is subject to
     liability for any Hazardous Substance disposal or contamination on any
     third party property; (v) neither it nor any Subsidiary has been associated
     with any release or threat of release of any Hazardous Substance; (vi)
     neither it nor any Subsidiary has received any notice, demand, letter,
     claim, or request for information alleging that it or any of its
     Subsidiaries may be in violation of or liable under any Environmental Law;
     (vii) neither it nor any of its Subsidiaries is subject to any orders,
     decrees, injunctions, or other arrangements with any Governmental Entity or
     is subject to any indemnity or other agreement with any third party
     relating to liability under any Environmental Law or relating to Hazardous
     Substances; and (viii) there are no circumstances or conditions involving
     it or any of its Subsidiaries that could reasonably be expected to result
     in any claims, liability, investigations, costs, or restrictions on the
     ownership, use, or transfer of any of its properties pursuant to any
     Environmental Law.

     The term "Environmental Law" means any Law relating to: (A) the protection,
investigation or restoration of the environment, health, safety, or natural
resources; (B) the handling, use, presence, disposal, release, or threatened
release of any Hazardous Substance; or (C) noise, odor, wetlands, pollution,
contamination, or any injury or threat of injury to persons or property or
notifications to government agencies or the public in connection with any
Hazardous Substance.

     The term "Hazardous Substance" means any substance that is listed,
classified, or regulated pursuant to any Environmental Law, including any
petroleum product or by-product, asbestos- containing material, lead-containing
paint or plumbing, polychlorinated biphenyls, electromagnetic fields, microwave
transmission, radioactive materials, or radon.

          (o) Brokers and Finders.  Neither it nor any of its officers,
     directors or employees has employed any broker or finder or incurred any
     liability for any brokerage fees, commissions or finders' fees in
     connection with the Merger or the other transactions contemplated in this
     Agreement or, the Series C Consent Agreement, as applicable, except that:
     (i) PageNet has employed Houlihan Lokey Howard & Zukin Capital, Goldman,
     Sachs & Co. and Morgan Stanley Dean Witter as its financial advisors, the
     arrangements with which have been disclosed to Arch prior to the date of
     this Agreement; and (ii) Arch has employed Bear, Stearns & Co. Inc. as its
     financial advisor, the arrangements with which have been disclosed to
     PageNet prior to the date of this Agreement.

          (p) Computer Systems.  Except as set forth in its Reports: (i) its
     computer system performs and shall perform properly all date-sensitive
     functions with respect to dates prior to and after December 31, 1999; and
     (ii) it has developed feasible contingency plans to ensure uninterrupted
     and unimpaired business operation in the event of a failure of its own or a
     third party's computer system or equipment on or about January 1, 2000
     (including, those of vendors, customers, and suppliers, and a general
     failure of, or interruption in, its communications and delivery
     infrastructure).

          (q) FCC Licenses.  Each of Arch and PageNet, and each of its
     respective Subsidiaries, is the authorized and legal holder of, or
     otherwise has all rights to, all Permits issued under or pursuant to the
     Communications Act, the FCC Regulations, and State Laws which are necessary
     for the operation of their respective businesses as presently operated,
     except as would not, individually or in

                                      A-15
<PAGE>   305

     aggregate, have a Materially Adverse Effect on it. All such Permits and
     licenses are validly issued and in full force and effect, except as would
     not, individually or in the aggregate, have a Material Adverse Effect on
     it. Each of Arch and PageNet, and each of its respective Subsidiaries, is
     in compliance in all respects with the terms and conditions of each such
     Permit and with all applicable Governmental Regulations, except where the
     failure to be in compliance would not have a Material Adverse Effect on it.
     There is not pending, and to the actual knowledge of the Knowledgeable
     Executives of Arch and PageNet, as applicable, any threatened, action by or
     before the FCC or any governmental or regulatory authority to revoke,
     suspend, cancel, rescind, or modify in any material respect any of such
     party's Permits rights under the Communications Act, the FCC Regulations or
     State Laws. Each party has made all regulatory filings required, and paid
     all fees and assessments imposed, by any Governmental Entity, and all such
     filings and the calculation of such fees, are accurate in all material
     respects, except where the failure to make such filing or pay such fees or
     assessments would not have a Material Adverse Effect on such party.

                                  ARTICLE VI.

                                   COVENANTS

     6.1.  Interim Operations.

     (a) PageNet covenants and agrees as to itself and its Subsidiaries that,
from and after the date of this Agreement and prior to the Effective Time
(unless Arch shall otherwise approve in writing, and except as otherwise
expressly contemplated by this Agreement, disclosed in the PageNet Disclosure
Letter, or required by applicable Law):

          (i) Its business and the business of its Subsidiaries shall be
     conducted only in the ordinary and usual course and, to the extent
     consistent therewith, it and its Subsidiaries shall use their reasonable
     best efforts to preserve their respective business organizations intact and
     maintain their respective existing relations and goodwill with customers,
     suppliers, regulators, distributors, creditors, lessors, employees and
     business associates;

          (ii) It shall not: (A) amend its certificate of incorporation or
     bylaws; (B) split, combine, subdivide or reclassify its outstanding shares
     of capital stock; (C) declare, set aside or pay any dividend payable in
     cash, stock or property with respect to any capital stock; or (D)
     repurchase, redeem or otherwise acquire, except in connection with existing
     commitments under PageNet Stock Plans but subject to PageNet's obligations
     under subparagraph (iii) below, or permit any of its Subsidiaries to
     purchase or otherwise acquire, any shares of its capital stock or any
     securities convertible into, or exchangeable or exercisable for, any shares
     of its capital stock;

          (iii) Neither it nor any of its Subsidiaries shall take any action
     that would prevent the Merger from qualifying as a "reorganization" within
     the meaning of Section 368(a) of the Code or that would cause any of its
     representations and warranties in this Agreement to become untrue in any
     material respect;

          (iv) Neither it nor any of its ERISA Affiliates shall: (A) accelerate,
     amend or change the period of exercisability of or terminate, establish,
     adopt, enter into, make any new grants or awards of stock-based
     compensation or other benefits under any Compensation and Benefit Plans;
     (B) amend or otherwise modify any Compensation and Benefit Plan; or (C)
     increase the salary, wage, bonus or other compensation of any directors,
     officers or key employees, except: (x) for grants or awards to directors,
     officers and employees of it or its Subsidiaries under existing
     Compensation and Benefit Plans in such amounts and on such terms as are
     consistent with past practice; (y) in the ordinary and usual course of its
     business (which may include normal periodic performance reviews and related
     compensation and benefit increases and the provision of individual PageNet
     Compensation and Benefit Plans consistent with past practice for promoted
     or newly hired officers and employees on terms consistent with past
     practice);or (z) for actions necessary to satisfy existing contractual
     obligations under Compensation and Benefit Plans existing as of the date of
     this Agreement;

                                      A-16
<PAGE>   306

          (v) Neither it nor any of its Subsidiaries shall incur, repay or
     retire prior to maturity or refinance any indebtedness for borrowed money
     or guarantee any such indebtedness or issue, sell, repurchase or redeem
     prior to maturity any debt securities or warrants or rights to acquire any
     debt securities or guarantee any debt securities of others, except (A) in
     the ordinary and usual course of its business, (B) for any refinancing of
     such indebtedness or debt securities on terms no less favorable in the
     aggregate to PageNet and which would not prevent, materially delay or
     materially impair PageNet's ability to consummate the transactions
     contemplated by this Agreement, and (C) for any retirement in exchange for
     PageNet Shares consistent with past practice;

          (vi) Neither it nor any of its Subsidiaries shall make any capital
     expenditures in an aggregate amount in excess of the aggregate amount
     reflected in PageNet's capital expenditure budget for the fiscal years
     ending December 31, 1999 and 2000, a copy of which has been provided to
     Arch;

          (vii) Neither it nor any of its Subsidiaries shall issue, deliver,
     sell, pledge or encumber shares of any class of its capital stock or any
     securities convertible or exchangeable into, or any rights, warrants or
     options to acquire, or any bonds, debentures, notes, or other debt
     obligations having the right to vote or that are convertible or exercisable
     for, any such shares, except PageNet may issue PageNet Shares in exchange
     for indebtedness or debt securities pursuant to clause (v) above;

          (viii) Neither it nor any of its Subsidiaries shall authorize, propose
     or announce an intention to authorize or propose, or enter into an
     agreement with respect to, any merger, consolidation or business
     combination (other than the Merger), or any purchase, sale, lease, license
     or other acquisition or disposition of any business or of a material amount
     of assets or securities, except for transactions entered into in the
     ordinary and usual course of its business, except for any acquisition of
     assets or any investment having a cash purchase price of $25,000,000 or
     less in any single instance and $50,000,000 or less in the aggregate where
     such acquisition or investment would not prevent, materially delay or
     materially impair PageNet's ability to consummate the transactions
     contemplated by this Agreement;

          (ix) PageNet shall not make any material change in its accounting
     policies or procedures, other than any such change that is required by
     GAAP;

          (x) PageNet shall not release, assign, settle or compromise any
     material claims or litigation in excess of $300,000 or make any material
     tax election or settle or compromise any material federal, state, local or
     foreign tax liability; and

          (xi) Neither it nor any of its Subsidiaries shall authorize or enter
     into any agreement to do any of the foregoing.

     (b) Arch covenants and agrees as to itself and its Subsidiaries that, from
and after the date of this Agreement and prior to the Effective Time (unless
PageNet shall otherwise approve in writing and except as otherwise expressly
contemplated by this Agreement, disclosed in the Arch Disclosure Letter, or
required by applicable Law):

          (i) Its business and the business of its Subsidiaries shall be
     conducted only in the ordinary and usual course and, to the extent
     consistent therewith, it and its Subsidiaries shall use their reasonable
     best efforts to preserve their respective business organizations intact and
     maintain their respective existing relations and goodwill with customers,
     suppliers, regulators, distributors, creditors, lessors, employees and
     business associates;

          (ii) It shall not: (A) amend its certificate of incorporation or
     bylaws; (B) split, combine, subdivide or reclassify its outstanding shares
     of capital stock; (C) declare, set aside or pay any dividend payable in
     cash, stock or property with respect to any capital stock, except for a
     dividend that would be received by holders of PageNet Shares on an
     equivalent post-Merger basis per share of Arch Common Stock after the
     Effective Time; or (D) repurchase, redeem or otherwise acquire, except in
     connection with existing commitments under Arch Stock Plans but subject to
     Arch' obligations under subparagraph (iii) below, or permit any of its
     Subsidiaries to purchase or otherwise

                                      A-17
<PAGE>   307

     acquire, any shares of its capital stock or any securities convertible
     into, or exchangeable or exercisable for, any shares of its capital stock;

          (iii) Neither it nor any of its Subsidiaries shall take any action
     that would prevent the Merger from qualifying as a "reorganization" within
     the meaning of Section 368(a) of the Code or that would cause any of its
     representations and warranties in this Agreement to become untrue in any
     material respect;

          (iv) Neither it nor any of its ERISA Affiliates shall: (A) accelerate,
     amend or change the period of exercisability of or terminate, establish,
     adopt, enter into, make any new grants or awards of stock-based
     compensation or other benefits under any Compensation and Benefit Plans;
     (B) amend or otherwise modify any Compensation and Benefit Plan; or (C)
     increase the salary, wage, bonus or other compensation of any directors,
     officers or key employees, except: (x) for grants or awards to directors,
     officers and employees of it or its Subsidiaries under existing
     Compensation and Benefit Plans in such amounts and on such terms as are
     consistent with past practice; (y) in the ordinary and usual course of its
     business (which may include normal periodic performance reviews and related
     compensation and benefit increases and the provision of individual Arch
     Compensation and Benefit Plans consistent with past practice for promoted
     or newly hired officers and employees on terms consistent with past
     practice); or (z) for actions necessary to satisfy existing contractual
     obligations under its Compensation and Benefit Plans existing as of the
     date of this Agreement;

          (v) Neither it nor any of its Subsidiaries shall incur, repay or
     retire prior to maturity or refinance any indebtedness for borrowed money
     or guarantee any such indebtedness or issue, sell, repurchase or redeem
     prior to maturity any debt securities or warrants or rights to acquire any
     debt securities or guarantee any debt securities of others, except in (A)
     the ordinary and usual course of its business, (B) for any refinancing of
     such indebtedness or debt securities on terms no less favorable in the
     aggregate to Arch and which would not prevent, materially delay or
     materially impair Arch' or Merger Sub's ability to consummate the
     transactions contemplated by this Agreement, and (C) for any retirement in
     exchange for shares of Arch Common Stock consistent with past practice;

          (vi) Neither it nor any of its Subsidiaries shall make any capital
     expenditures in an aggregate amount in excess of the aggregate amount
     reflected in Arch' capital expenditure budget for the fiscal years ending
     December 31, 1999 and 2000, a copy of which has been provided to PageNet;

          (vii) Neither it nor any of its Subsidiaries shall issue, deliver,
     sell, pledge or encumber shares of any class of its capital stock or any
     securities convertible or exchangeable into, or any rights, warrants or
     options to acquire, or any bonds, debentures, notes, or other debt
     obligations having the right to vote or that are convertible or exercisable
     for, any such shares, except Arch may issue shares of Arch Common Stock
     issued in exchange for indebtedness or debt securities pursuant to clause
     (v) above;

          (viii) Neither it nor any of its Subsidiaries shall authorize, propose
     or announce an intention to authorize or propose, or enter into an
     agreement with respect to, any merger, consolidation or business
     combination (other than the Merger), or any purchase, sale, lease, license
     or other acquisition or disposition of any business or of a material amount
     of assets or securities, except for transactions entered into in the
     ordinary and usual course of its business, except for any acquisition of
     assets or any investment having a cash purchase price of $25,000,000 or
     less in any single instance and $50,000,000 or less in the aggregate where
     such acquisition or investment would not prevent, materially delay or
     materially impair Arch' or Merger Sub's ability to consummate the
     transactions contemplated by this Agreement;

          (ix) Arch shall not make any material change in its accounting
     policies or procedures, other than any such change that is required by
     GAAP;

          (x) Arch shall not release, assign, settle or compromise any material
     claims or litigation in excess of $300,000 or make any material tax
     election or settle or compromise any material federal, state, local or
     foreign tax liability; and

                                      A-18
<PAGE>   308

          (xi) Neither it nor any of its Subsidiaries shall authorize or enter
     into any agreement to do any of the foregoing.

     (c) Arch and PageNet agree that any written approval obtained under this
Section 6.1 must be signed, if on behalf of Arch, by the Chief Executive Officer
or the Chief Financial Officer of Arch, or if on behalf of PageNet, by the
Chairman of the Board and Chief Executive Officer or President and Chief
Operating Officer of PageNet.

     (d) Notwithstanding any other provision hereof to the contrary, PageNet
may, after the date hereof (i) issue, deliver, sell, pledge or encumber in
arms-length transactions with unaffiliated third parties shares of any class of
capital stock of the Distributed Subsidiary or any securities convertible or
exchangeable into, or any rights, warrants or options to acquire, or any bonds,
debentures, notes, or other debt obligations having the right to vote or that
are convertible or exercisable for, any such shares of the Distributed
Subsidiary, (ii) cause the Distributed Subsidiary to incur any indebtedness for
borrowed money, if all proceeds thereof are used solely by the Distributed
Subsidiary, (iii) transfer the assets set forth in the corresponding section of
the PageNet Disclosure Letter to the Distributed Subsidiary, (iv) determine the
form of security or securities representing the equity ownership of the
Distributed Subsidiary to be distributed to the holders of PageNet Shares or
PageNet Notes pursuant to Sections 6.18 and 6.22 of this Agreement and designate
the rights and restrictions applicable to such securities, (v) establish an
employee stock option, stock ownership or other similar plan and set aside
common equity (of the same type as the Distributed Interests or any securities
underlying such Distributed Interests) representing up to 20% of the equity
ownership of the Distributed Subsidiary for such purpose, or (vi) enter into
such transactions, arrangements or agreements with the Distributed Subsidiary on
terms and conditions approved by Arch or cause the Distributed Subsidiary to
enter into arms-length transactions, arrangements or agreements with third
parties, in each case, as are reasonably necessary and appropriate to permit the
Distributed Subsidiary to continue its business and operations in the ordinary
course following the Merger; provided, that the taking of such action shall not
cause Arch or the Surviving Corporation (other than through its ownership of
capital stock in the Distributed Subsidiary after the Effective Time) to incur
any liability or obligation which would not have been incurred by the Surviving
Corporation pursuant to the Merger or the other transactions contemplated
hereby. It is understood and agreed by the parties to this Agreement, that in
the event that, prior to or at the Effective Time, PageNet shall take any action
set forth in (i), (ii), (v) or (vi) above that reduces the aggregate amount of
Distributed Interests available to be distributed to the parties, the
distribution of the Distributed Interests will be ratably adjusted such that
holders of PageNet Shares at the Spinoff Record Date and holders of PageNet
Notes immediately prior to the Effective Time receive 80.5% of the remaining
interests in the Distributed Subsidiary and the Surviving Corporation receives
19.5% of the remaining interests in the Distributed Subsidiary.

     6.2.  Acquisition Proposals.

     (a) Except as set forth in Section 6.1(d) of this Agreement, PageNet and
Arch each agree that neither it nor any of its Subsidiaries nor any of the
officers and directors of it or its Subsidiaries shall, and that each shall
direct and use its best efforts to cause its and its Subsidiaries' employees,
agents and representatives (including any investment banker, attorney or
accountant retained by it or any of its Subsidiaries) (PageNet or Arch, as the
case may be, its respective Subsidiaries and their officers, directors,
employees, agents and representatives being referred to as its
"Representatives") not to, directly or indirectly, initiate, solicit, encourage
or otherwise facilitate any inquiries or the making of any proposal or offer
with respect to a merger, reorganization, acquisition, share exchange,
consolidation, business combination, recapitalization, liquidation, dissolution
or similar transaction involving it, or any purchase or sale of the consolidated
assets (including without limitation stock of Subsidiaries) of it or any of its
Subsidiaries, taken as a whole, having an aggregate value equal to 10% or more
of its assets, or any purchase or sale of, or tender or exchange offer for, 15%
or more of its equity securities (any such proposal or offer being referred to
as an "Acquisition Proposal"). PageNet and Arch further agree that neither it
nor any of its Subsidiaries nor any of the officers and directors of it or its
Subsidiaries shall, and that it shall direct and use its best efforts to cause
its Representatives not to, directly or indirectly, have any

                                      A-19
<PAGE>   309

discussion with, or provide any confidential information or data to, any Person
relating to, or in contemplation of, an Acquisition Proposal or engage in any
negotiations concerning an Acquisition Proposal, or otherwise facilitate any
effort or attempt to make or implement an Acquisition Proposal; provided,
however, that nothing contained in this Agreement shall prevent PageNet, Arch or
their respective Board of Directors from: (A) complying with Rule 14e-2
promulgated under the Exchange Act with regard to an Acquisition Proposal; (B)
engaging in any discussions or negotiations with or providing any information
to, any Person in response to an unsolicited bona fide written Acquisition
Proposal by any such Person; or (C) subject to the obligation of (x) PageNet
pursuant to Section 6.5(a) to duly convene a PageNet Stockholders Meeting at
which a vote of the stockholders of PageNet shall be taken regarding the
adoption of this Agreement and the approval of the Merger and the other
transactions contemplated by this Agreement, and (y) Arch pursuant to Section
6.5(b) to duly convene a Arch Stockholders Meeting at which a vote of the
stockholders of Arch shall be taken with respect to the matters set forth in
Section 6.5(b) of this Agreement, recommending such an unsolicited bona fide
written Acquisition Proposal to its stockholders if, and only to the extent
that, with respect to the actions referred to in clauses (B) or (C): (i) its
Board of Directors concludes in good faith (after consultation with its outside
legal counsel and its financial advisor) that such Acquisition Proposal is
reasonably capable of being completed, taking into account all legal, financial,
regulatory and other aspects of the proposal and the Person making the proposal,
and would, if consummated, result in a transaction more favorable to its
stockholders from a financial point of view than the transaction contemplated by
this Agreement (any such Acquisition Proposal being referred to herein as a
"Superior Proposal"); (ii) its Board of Directors determines in good faith after
consultation with outside legal counsel that such action is necessary for the
Board of Directors to comply with its fiduciary duty to its stockholders under
applicable Law; and (iii) prior to providing any information or data to any
Person in connection with a Superior Proposal by any such Person, its Board of
Directors shall receive from such Person an executed confidentiality agreement
on terms substantially similar to those contained in the Confidentiality
Agreement (as defined in Section 6.15); provided, that such confidentiality
agreement shall contain terms that allow it to comply with its obligations under
this Section 6.2.

     (b) PageNet and Arch each agree that it will immediately cease and cause to
be terminated any existing activities, discussions or negotiations with any
parties conducted heretofore with respect to any Acquisition Proposal. PageNet
and Arch each agree that it will take the necessary steps to promptly inform
each of its Representatives of the obligations undertaken in Section 6.2(a).
PageNet and Arch each agree that it will notify the other party immediately if
any such inquiries, proposals or offers are received by, any such information is
requested from, or any such discussions or negotiations are sought to be
initiated or continued with, any of its Representatives indicating, in
connection with such notice, the name of such Person making such inquiry,
proposal, offer or request and the substance of any such inquiries, proposals or
offers. Such party thereafter shall keep the other informed, on a current basis,
of the status and terms of any such inquiries, proposals or offers and the
status of any such discussions or negotiations. PageNet and Arch each also agree
that it will promptly request each Person that has heretofore executed a
confidentiality agreement in connection with its consideration of any
Acquisition Proposal to return all confidential information heretofore furnished
to such Person by, or on behalf of, it or any of its Subsidiaries.

     6.3.  The Certificate Amendments.  Arch shall take all actions necessary
(subject to applicable law and any necessary stockholder approval) to adopt the
Certificate Amendments. The Certificate Amendments shall provide for (i) an
increase in the authorized number of shares of Arch Common Stock to an amount
sufficient to effectuate the actions contemplated hereby and (ii) the conversion
of each Arch Series C Preferred Share into shares of Arch Common Stock as
described in this Agreement. Some or all of the Certificate Amendments may, in
the discretion of Arch, be made contingent upon the consummation of the Merger
or the Alternative Merger (as the case may be).

     6.4.  Information Supplied.  PageNet and Arch each agrees, as to itself and
its Subsidiaries, that none of the information supplied or to be supplied by it
or its Subsidiaries for inclusion or incorporation by reference in: (i) the
Registration Statement on Form S-4 to be filed with the SEC by Arch in
connection

                                      A-20
<PAGE>   310

with the issuance of shares of Arch Common Stock in the Merger (including the
joint proxy statement and prospectus (the "Prospectus/Proxy Statement")
constituting a part thereof) (the "S-4 Registration Statement") will, at the
time the S-4 Registration Statement becomes effective under the Securities Act;
and (ii) the Prospectus/Proxy Statement and any amendment or supplement thereto
will, at the date of mailing to stockholders and at the time of each of the
PageNet Stockholders Meeting and the Arch Stockholders Meeting to be held in
connection with the Merger, in any such case, contain any untrue statement of a
material fact or omit to state any material fact required to be liquidation
therein or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading. If at any time prior
to the Effective Time any information relating to Arch or PageNet, or any of
their respective affiliates (as defined in SEC Rule 12b-2), officers or
directors, is discovered by Arch or PageNet which should be set forth in an
amendment or supplement to any of the S-4 Registration Statement or the
Prospectus/Proxy Statement, so that any of such documents would not include any
misstatement of a material fact or would omit to state any material fact
required to be liquidation therein or necessary to make the statements therein,
in the light of the circumstances under which they were made, not misleading,
the party which discovers such information shall promptly notify the other
parties to this Agreement and an appropriate amendment or supplement describing
such information shall be promptly filed with the SEC and, to the extent
required by law, disseminated to the stockholders of PageNet and Arch.

     6.5.  Stockholders Meetings.

     (a) PageNet will take, in accordance with applicable Law and its
certificate of incorporation and bylaws, all action necessary to convene a
meeting of its stockholders (the "PageNet Stockholders Meeting") as promptly as
practicable after the S-4 Registration Statement is declared effective to
consider and vote upon the adoption of this Agreement, and to approve the
Merger, an amendment to the PageNet certificate of incorporation to increase the
number of PageNet Shares authorized to an amount sufficient to complete the
transactions contemplated by this Agreement and the other transactions
contemplated by this Agreement. PageNet will take all necessary action to obtain
the adoption of this Agreement, the approval of the Merger, the amendment to the
PageNet certificate of incorporation to increase the number of PageNet Shares
authorized to the amount sufficient to complete the transactions contemplated by
this Agreement and the other transactions contemplated by this Agreement by the
holders of the PageNet Shares (the "PageNet Stockholders Approval"). The Board
of Directors of PageNet shall: (i) recommend that the stockholders adopt this
Agreement and thereby approve the Merger and the other transactions contemplated
by this Agreement (including without limitation adoption of the Prepackaged Plan
and authorization of the Bankruptcy Case) and the amendment to the PageNet
certificate of incorporation to increase the number of PageNet Shares authorized
to the amount sufficient to complete the transactions contemplated by this
Agreement; and (ii) take all lawful action to solicit such adoption and
approval; provided, however, that PageNet's Board of Directors may, at any time
prior to the Effective Time, withdraw, modify or change any such recommendation
to the extent that PageNet's Board of Directors determines in good faith, after
consultation with outside legal counsel, that such withdrawal, modification or
change of its recommendation is required by its fiduciary duties to PageNet's
stockholders under applicable Law; provided, further, that, unless this
Agreement is terminated by Arch pursuant to Section 8.4, PageNet shall, as
promptly as practicable after the S-4 Registration Statement is declared
effective, duly convene and complete the PageNet Stockholders Meeting regarding
the adoption of this Agreement and the approval of the Merger, the amendment to
the PageNet certificate of incorporation set forth above and the other
transactions contemplated by this Agreement, regardless of whether PageNet's
Board of Directors has withdrawn, modified, or changed its recommendation to the
stockholders regarding the adoption of this Agreement or the approval of the
Merger, the amendment to the PageNet certificate of incorporation set forth
above or the other transactions contemplated by this Agreement prior to such
PageNet Stockholders Meeting. Notwithstanding the foregoing or any other
provision of this Agreement to the contrary, PageNet shall not be required to
convene a PageNet Stockholders Meeting after (x) the Bankruptcy Case has
commenced or (y) PageNet stipulates to bankruptcy relief after the occurrence of
an Involuntary Insolvency Event pursuant to Section 6.19(a)(v) hereof.

                                      A-21
<PAGE>   311

     (b) Arch will take, in accordance with applicable Law and its certificate
of incorporation and bylaws, all action necessary to convene a meeting of its
stockholders (the "Arch Stockholders Meeting") as promptly as practicable after
the S-4 Registration Statement is declared effective to (i) consider and vote
upon (A) the Certificate Amendments and the issuance of shares of Arch Common
Stock pursuant to the Merger, the conversion of the Arch Series C Preferred
Shares and the Arch Exchange Offer or (B) if the Alternative Merger is elected
pursuant to Section 4.5 and Arch is a party to the Alternative Merger, the
adoption of this Agreement and the approval of the Alternative Merger and the
other transactions contemplated by this Agreement (including the actions
contemplated by the Certificate Amendments, which may be effectuated pursuant to
a certificate of merger filed in connection with such Alternative Merger); and
(ii) to approve any actions necessary pursuant to Section 3.1 hereof (the "Arch
Stockholders Approval"). Arch will take all necessary action to obtain such
consents and approvals. The Board of Directors of Arch shall: (i) recommend that
the stockholders adopt the Certificate Amendments and approve the issuance of
Arch Common Stock pursuant to the Merger, the conversion of the Arch Series C
Preferred Shares and the Arch Exchange Offer (or this Agreement and the
Alternative Merger if Arch is a party to the Alternative Merger) and the other
transactions contemplated by this Agreement; and (ii) take all lawful action to
solicit such adoption; provided, however, that Arch' Board of Directors may, at
any time prior to the Effective Time, withdraw, modify or change any such
recommendation to the extent that Arch' Board of Directors determines in good
faith, after consultation with outside legal counsel, that such withdrawal,
modification or change of its recommendation is required by its fiduciary duties
to Arch' stockholders under applicable Law; provided, further, that, unless this
Agreement is terminated by PageNet pursuant to Section 8.3, Arch shall, as
promptly as practicable after the S-4 Registration Statement is declared
effective, duly convene and complete the Arch Stockholders Meeting regarding the
adoption of the Certificate Amendments and the issuance of shares of Arch Common
Stock pursuant to the Merger, the conversion of the Arch Series C Preferred
Shares and the Arch Exchange Offer (or this Agreement and the Alternative Merger
if Arch is a party to the Alternative Merger) and the other transactions
contemplated by this Agreement, regardless of whether Arch' Board of Directors
has withdrawn, modified, or changed its recommendation to the stockholders
regarding the adoption of the Certificate Amendments and the issuance of shares
of Arch Common Stock pursuant to the Merger, the conversion of the Arch Series C
Preferred Shares and the Arch Exchange Offer (or this Agreement and the
Alternative Merger if Arch is a party to the Alternative Merger) or the other
transactions contemplated by this Agreement prior to such Arch Stockholders
Meeting.

     6.6.  Filings; Other Actions; Notification.

     (a) Arch and PageNet shall promptly prepare and file with the SEC the
Prospectus/Proxy Statement, and Arch shall prepare and file with the SEC the S-4
Registration Statement as promptly as practicable. Arch and PageNet each shall
use its reasonable best efforts to have the S-4 Registration Statement declared
effective under the Securities Act as promptly as practicable and on the same
day as each of the Exchange Registration Statements, and promptly thereafter
mail the Prospectus/Proxy Statement to the stockholders of Arch and PageNet.
Arch shall also use its reasonable best efforts to obtain prior to the effective
date of the S-4 Registration Statement all necessary state securities law or
"blue sky" permits and approvals required in connection with the Merger and the
other transactions contemplated by this Agreement and will pay all expenses
incident thereto. Each party shall notify the other of the receipt of the
comments of the SEC and of any requests by the SEC for amendments or supplements
to the Prospectus/Proxy Statement or the S-4 Registration Statement or for
additional information and shall promptly supply one another with copies of all
correspondence between any of them (or their Representatives) and the SEC (or
its staff) with respect thereto. If, at any time prior to either of the Arch
Stockholders Meeting or the PageNet Stockholders Meeting, any event shall occur
relating to or affecting Arch, PageNet, or their respective officers or
directors, which event should be described in an amendment or supplement to the
Prospectus/Proxy Statement or the S-4 Registration Statement, the parties shall
promptly inform one another and shall cooperate in promptly preparing filing and
clearing with the SEC and, if required by applicable securities laws, mailing to
Arch' or PageNet's stockholders, as the case may be, such amendment or
supplement.

                                      A-22
<PAGE>   312

     (b) PageNet and Arch each shall use its respective reasonable best efforts
to cause to be delivered to the other party and its directors a letter of its
independent auditors, dated: (i) the date on which the S-4 Registration
Statement and the Exchange Registration Statements shall become effective; and
(ii) the Closing Date, and addressed to the other party and its directors, in
form and substance customary for "comfort" letters delivered by independent
public accountants in connection with registration statements similar to the S-4
Registration Statement and the Exchange Registration Statements.

     (c) PageNet and Arch shall cooperate with each other and use (and shall
cause their respective Subsidiaries to use) their respective reasonable best
efforts: (i) to take or cause to be taken all actions, and do or cause to be
done all things, necessary, proper or advisable on its part under this Agreement
and applicable Laws to consummate and make effective the Merger, the Exchange
Offers and the other transactions contemplated by this Agreement (including, if
necessary, the Prepackaged Plan) as soon as practicable, including: (A)
obtaining opinions of their respective attorneys referred to in Article VII
below; (B) preparing and filing as promptly as practicable all documentation to
effect all necessary applications, notices, petitions, filings and other
documents; and (C) instituting court actions or other proceedings necessary to
obtain the approvals required to consummate the Merger, the Exchange Offers or
the other transactions contemplated by this Agreement or defending or otherwise
opposing all court actions or other proceedings instituted by a Governmental
Entity or other Person under the Governmental Regulations for purposes of
preventing the consummation of the Merger, the Exchange Offers and the other
transactions contemplated by this Agreement; and (ii) to obtain as promptly as
practicable all consents, registrations, approvals, permits and authorizations
necessary or advisable to be obtained from any third party and/or any
Governmental Entity in order to consummate the Merger, the Exchange Offers or
any of the other transactions contemplated by this Agreement; provided, however,
that nothing in this Section 6.5 shall require either Arch or PageNet to agree
to any divestitures or hold separate or similar arrangements if such
divestitures or arrangements would reasonably be expected to have a material
adverse effect on Arch or PageNet, or a material adverse effect on the expected
benefits of the Merger to it. Neither Arch nor PageNet will agree to any
divestitures or hold separate or similar arrangements without the prior written
approval of the other party. Subject to applicable laws relating to the exchange
of information, Arch and PageNet shall have the right to review in advance, and
to the extent practicable each will consult the other party on, all the
information relating to Arch or PageNet, as the case may be, and any of their
respective Subsidiaries, that appear in any filing made with, or written
materials submitted to, any third party and/or any Governmental Entity in
connection with the Merger and the other transactions contemplated by this
Agreement. In exercising the foregoing right, each of PageNet and Arch shall act
reasonably and as promptly as practicable.

     (d) PageNet and Arch each shall, upon request by the other party, furnish
the other party with all information concerning itself, its Subsidiaries,
directors, officers and stockholders and such other matters as may be reasonably
necessary or advisable in connection with the Prospectus/Proxy Statement, the
S-4 Registration Statement, the Exchange Registration Statements or any other
statement, filing, notice or application made by, or on behalf of, Arch, PageNet
or any of their respective Subsidiaries to any third party and/or any
Governmental Entity in connection with the Merger, the Exchange Offers and the
transactions contemplated by this Agreement.

     (e) PageNet and Arch each shall keep the other party apprised of the status
of matters relating to completion of the transactions contemplated by this
Agreement, including promptly furnishing the other party with copies of notices
or other communications received by Arch or PageNet, as the case may be, or any
of its Subsidiaries, from any third party and/or any Governmental Entity with
respect to the Merger, the Exchange Offers and the other transactions
contemplated by this Agreement. Each of PageNet and Arch shall give prompt
notice to the other party of any change that is reasonably likely to result in a
Material Adverse Effect on it or of any failure of any conditions to the other
party's obligations to effect the Merger set forth in Article VII.

     (f) Each of PageNet and Arch agrees that if a bona fide Acquisition
Proposal is made to acquire shares of the other party to this Agreement, then
upon the request of the party not receiving the Acquisition Proposal, the party
receiving the Acquisition Proposal will cooperate with the other party to

                                      A-23
<PAGE>   313

this Agreement to make such filings and take such other actions as may be
permitted or required under the FCC's Policy Statement in Tender Offers and
Proxy Contests, in order to allow the parties to this Agreement to take all
steps as are necessary to consummate the transactions contemplated hereby
pending FCC approval of the transaction.

     6.7.  Access; Consultation.  Upon reasonable notice, and except as may be
prohibited by applicable Law, PageNet and Arch each shall (and shall cause its
Subsidiaries to) afford the other and its respective Representatives, reasonable
access, during normal business hours throughout the period prior to the
Effective Time, to its properties, books, contracts and records and, during such
period, each shall (and shall cause its Subsidiaries to) furnish promptly to the
other party all information concerning its business, properties and personnel as
may reasonably be requested; provided that no investigation pursuant to this
section shall affect or be deemed to modify any representation or warranty made
by PageNet or Arch under this Agreement; and provided, further, that the
foregoing shall not require PageNet or Arch to permit any inspection, or to
disclose any information, that in the reasonable judgment of PageNet or Arch, as
the case may be, would result in the disclosure of any trade secrets of it or
third parties, or violate any of its obligations with respect to confidentiality
if PageNet or Arch, as the case may be, shall have used all reasonable efforts
to obtain the consent of such third party to such inspection or disclosure. All
requests for information made pursuant to this section shall be directed to an
executive officer of PageNet or Arch, as the case may be, or such Person as may
be designated by any such executive officer, as the case may be.

     6.8.  Affiliates.  PageNet shall deliver to Arch a letter identifying all
Persons whom PageNet believes to be, at the date of its Stockholders Meeting,
affiliates of PageNet for purposes of Rule 145 under the Securities Act ("Rule
145 Affiliates"). PageNet shall use all reasonable efforts to cause each Person
who is identified as a Rule 145 Affiliate in the letter referred to above to
deliver to Arch on or prior to the date of such party's respective Stockholders
Meeting a written agreement, in the form attached as Exhibit C (the "PageNet
Affiliates Agreement"). Prior to the Effective Time, PageNet shall use all
reasonable efforts to cause each additional Person who is identified as a Rule
145 Affiliate after the date of its Stockholders Meeting to execute the
applicable written agreement as set forth in this Section 6.8, as soon as
practicable after such Person is identified.

     6.9.  Stock Exchange Listing.  To the extent they are not already listed,
Arch shall use its reasonable best efforts to cause the shares of Arch Common
Stock to be issued pursuant to the Merger, Arch Exchange Offer and pursuant to
the Certificate Amendments to be approved for listing on the Nasdaq National
Market (the "NASDAQ") and on all other stock exchanges on which shares of Arch
Common Stock are then listed, subject to official notice of issuance, prior to
the Closing Date.

     6.10.  Publicity.  The initial press release with respect to the Merger
shall be a joint press release. Thereafter PageNet and Arch shall consult with
each other prior to issuing any press releases or otherwise making public
announcements with respect to the Merger, the Exchange Offers and the other
transactions contemplated by this Agreement and prior to making any filings with
any third party and/or any Governmental Entity (including any securities
exchange) with respect thereto, except as may be required by Law or by
obligations pursuant to any listing agreement with, or rules of, any securities
exchange.

     6.11.  Benefits.

     (a) Stock Options.

          (i) At the Effective Time, each outstanding option to purchase PageNet
     Shares (a "PageNet Option") under PageNet Stock Plans, and which has not
     vested prior to the Effective Time, shall become fully exercisable and
     vested as of the Effective Time. At the Effective Time, each PageNet Option
     shall be converted to an option to acquire, on the same terms and
     conditions as were applicable under such PageNet Option, the same number of
     shares of Arch Common Stock as the holder of such PageNet Option would have
     been entitled to receive pursuant to the Merger had such holder exercised
     such PageNet Option in full immediately prior to the Effective Time
     (rounded down to the nearest whole number) (a "Substitute Option"), at an
     exercise price per share (rounded to the

                                      A-24
<PAGE>   314

     nearest whole cent) equal to: (y) the aggregate exercise price for PageNet
     Shares otherwise purchasable by such holder pursuant to such PageNet
     Option; divided by (z) the number of full shares of Arch Common Stock
     deemed purchasable pursuant to such PageNet Option in accordance with the
     foregoing.

          (ii) Notwithstanding the foregoing provisions, in the case of any
     option to which Code Section 421 applies, the option price, the number of
     shares subject to such option, and the terms and conditions of exercise of
     such option shall be determined in order to comply with Code Section
     424(a). As promptly as practicable after the Effective Time, Arch shall
     deliver to the participants in PageNet Stock Plans appropriate notices
     setting forth such participants' rights pursuant to the Substitute Options.

          (iii) With respect to each of the directors and officers of PageNet
     identified in Section 6.11(a)(iii) of the PageNet Disclosure Letter (each,
     a "Section 16 Person"), the full Board of Directors of PageNet shall
     approve the disposition by each such Section 16 Person of the PageNet
     equity securities (including derivative securities) set forth next to such
     Section 16 Person's name in Section 6.11(a)(iii) of the PageNet Disclosure
     Letter and the full Board of Directors of Arch shall approve the
     acquisition by each such Section 16 Person of the Arch equity securities
     (including derivative securities) set forth next to such Section 16
     Person's name in Section 6.11(a)(iii) of the PageNet Disclosure Letter.
     Each such approval shall specify, in the form set forth in Section
     6.11(a)(iii) of the PageNet Disclosure Letter, the material terms of the
     derivative securities and each such approval shall specify that the
     approval is granted for purposes of exempting the transaction under Rule
     16b-3 under the Exchange Act.

     (b) Conversion and Registration.  At or prior to the Effective Time,
PageNet shall make all necessary arrangements with respect to PageNet Stock
Plans to permit the conversion of the unexercised PageNet Options into
Substitute Options pursuant to this section and, as soon as practicable after
the Effective Time, Arch shall use its reasonable best efforts to register under
the Securities Act on Form S-8 or other appropriate form (and use its best
efforts to maintain the effectiveness thereof) shares of Arch Common Stock
issuable pursuant to all Substitute Options.

     (c) Amendment to 401(k) Plan.  Prior to the Effective Time, PageNet shall
(i) amend the PageNet Employees Savings Plan and the related trust to prohibit
the investment of Employer Salary Reduction Contributions in equity securities
of PageNet (ii) deregister interests under such plan and any registered but
unsold equity securities of PageNet under the Securities Act of 1933 and the
Exchange Act.

     6.12.  Expenses.  Whether or not the Merger is consummated, all costs and
expenses incurred in connection with this Agreement, the Merger, the Exchange
Offers and the other transactions contemplated by this Agreement shall be paid
by the party incurring such cost and expense, except that costs and expenses
incurred in connection with the filing fee for the S-4 Registration Statement
and the Exchange Registration Statements, printing and mailing the
Prospectus/Proxy Statement, the S-4 Registration Statement and the Exchange
Registration Statements, and the filing fees under the HSR Act, any other
filings fees under any Governmental Regulations, and any filings fees in
connection with obtaining approvals under the Communications Act, FCC
Regulations and State Laws shall be shared equally by Arch and PageNet.

     6.13.  Indemnification; Directors' and Officers' Insurance.

     (a) For six years from and after the Effective Time, Arch will indemnify
and hold harmless each present and former director and officer of PageNet
(solely when acting in such capacity) determined as of the Effective Time (the
"Indemnified Parties"), against any costs or expenses (including reasonable
attorneys' fees), judgments, fines, losses, claims, damages or liabilities
(collectively, "Costs") incurred in connection with any claim, action, suit,
proceeding or investigation, whether civil, criminal, administrative or
investigative, arising out of or pertaining to matters existing or occurring at,
or prior to, the Effective Time, whether asserted or claimed prior to, at or
after the Effective Time, to the fullest extent that PageNet would have been
permitted under Delaware law and its certificate of incorporation or bylaws in

                                      A-25
<PAGE>   315

effect on the date of this Agreement to indemnify such Person (and the Surviving
Corporation shall also advance expenses as incurred to the fullest extent
permitted under applicable law, provided the Person to whom expenses are
advanced provides an undertaking to repay such advances if it is ultimately
determined that such Person is not entitled to indemnification).

     (b) Any Indemnified Party wishing to claim indemnification under paragraph
(a) of this Section 6.13 shall promptly notify Arch, upon learning of any such
claim, action, suit, proceeding or investigation, but the failure to so notify
shall not relieve Arch of any liability it may have to such Indemnified Party if
such failure does not materially prejudice the ability of Arch to defend such
claims. In the event of any such claim, action, suit, proceeding or
investigation (whether arising before or after the Effective Time), (i) Arch
shall have the right to assume the defense thereof and Arch shall not be liable
to such Indemnified Parties for any legal expenses of other counsel or any other
expenses subsequently incurred by such Indemnified Parties in connection with
the defense thereof, except that if Arch elects not to assume such defense or
counsel for the Indemnified Parties advises that there are actual conflicts of
interest between Arch and the Indemnified Parties, the Indemnified Parties may
retain counsel satisfactory to them, and Arch shall pay all reasonable fees and
expenses of such counsel for the Indemnified Parties promptly as statements
therefor are received; provided, however, that Arch shall be obligated pursuant
to this paragraph (b) to pay for only one firm of counsel for all Indemnified
Parties in any jurisdiction (unless there is such an actual conflict of
interest), (ii) the Indemnified Parties will cooperate in the defense of any
such matter and (iii) Arch shall not be liable for any settlement effected
without its prior written consent.

     (c) Arch shall maintain a policy of officers' and directors' liability
insurance for acts and omissions occurring prior to the Effective Time ("D&O
Insurance") with coverage in amount and scope at least as favorable as PageNet's
existing directors' and officers' liability insurance coverage for a period of
six years after the Effective Time; provided, however, if the existing D&O
Insurance expires, is terminated or canceled, or if the annual premium therefor
is increased to an amount in excess of 200% of the last annual premium paid
prior to the date of this Agreement (the "Current Premium"), in each case during
such six year period, Arch will use its best efforts to obtain D&O Insurance in
an amount and scope as great as can be obtained for the remainder of such period
for a premium not in excess (on an annualized basis) of 200% of the Current
Premium. The provisions of this Section 6.13(c) shall be deemed to have been
satisfied if prepaid policies shall have been obtained by PageNet prior to the
Closing, which policies provide such directors and officers with coverage for an
aggregate period of six years with respect to claims arising from facts or
events that occurred on, or prior to, the Effective Time, including, without
limitation, with respect to the transactions contemplated by this Agreement. If
such prepaid policies shall have been obtained by PageNet prior to the Closing,
then Arch shall maintain such policies in full force and effect and shall
continue to honor PageNet's obligations thereunder.

     (d) If Arch or any of its successors or assigns: (i) shall consolidate
with, or merge into, any other corporation or entity and shall not be the
continuing or surviving corporation or entity of such consolidation or merger;
or (ii) shall transfer all or substantially all of its properties and assets to
any individual, corporation or other entity, then and in each such case, proper
provisions shall be made so that the successors and assigns of Arch shall assume
all of the obligations set forth in this section. At the Effective Time, Arch
shall assume and be bound by all of PageNet's indemnity obligations with respect
to officers, directors and employees of corporations it previously acquired that
are identified in the corresponding section of the PageNet Disclosure Letter.

     (e) The provisions of this section are intended to be for the benefit of,
and shall be enforceable by, each of the Indemnified Parties, their heirs and
their representatives.

     6.14.  Takeover Statute.  If any Takeover Statute or similar statute or
regulation is or may become applicable to this Agreement or to the other
transactions contemplated hereby or thereby, each of the parties and its Board
of Directors shall grant such approvals and take all such actions as are legally
permissible so that the transactions contemplated under such agreements may be
consummated as promptly as practicable on the terms contemplated under such
agreements and otherwise act to eliminate

                                      A-26
<PAGE>   316

or minimize the effects of any such statute or regulation on the transactions
contemplated under such agreements.

     6.15.  Confidentiality.  PageNet and Arch each acknowledges and confirms
that it has entered into a Confidentiality Agreement, dated as of August 26,
1999 (the "Confidentiality Agreement"), and that the Confidentiality Agreement
shall remain in full force and effect in accordance with its terms.

     6.16.  Tax-Free Reorganization.  Arch, Merger Sub and PageNet shall each
use its best efforts to cause the Merger to be treated as a reorganization with
the meaning of Section 368(a) of the Code and to obtain an opinion of its
respective counsel as contemplated by Sections 7.2(d) and 7.3(d), respectively.

     6.17.  Senior Credit Facilities.  PageNet and Arch shall use their
reasonable best efforts to secure, through the amendment or restatement of their
respective current credit facilities, through a new credit facility or through
the operation of the Prepackaged Plan, or any combination of the foregoing,
senior secured debt financing in an amount not less than $1.3 billion on terms
reasonably acceptable to the parties to this Agreement. Simultaneously with the
Exchange Offers, PageNet shall solicit the consent of the holders of PageNet's
senior credit facilities (the "PageNet Secured Creditors") to the Prepackaged
Plan. The solicitation of the PageNet Secured Creditors shall be made in
accordance with the standards and requirements set forth in Section 6.18(e).

     6.18.  The Exchange Offers.

     (a) Provided that nothing shall have occurred that would result in a
failure to satisfy any other conditions set forth in Section 6.18(b) of this
Agreement, Arch and PageNet shall, as promptly as practicable, commence separate
exchange offers (the "Arch Exchange Offer" and the "PageNet Exchange Offer" and
together, the "Exchange Offers") to issue an aggregate of up to: (i) 29,651,984
shares of Arch Common Stock in exchange for the $448.4 million in aggregate
principal amount of Arch' 10 7/8% Senior Discount Notes due March 15, 2008
issued under and pursuant to an Indenture, dated as of March 12, 1996, between
Arch and IBJ Schroder Bank & Trust Company, as Trustee (the "Arch Notes"); and
(ii) in the case of PageNet, 616,830,757 PageNet Shares and, subject to Section
6.1(d) of this Agreement, Distributed Interests representing 68.9% of the equity
ownership in the Distributed Subsidiary in exchange for the $1.2 billion in
aggregate principal amount, together with all accrued interest thereon, of: (x)
10% Senior Subordinated Notes Due October 15, 2008 issued under and pursuant to
an Indenture, dated as of July 15, 1995, between PageNet and Shawmut Bank, N.A.,
as Trustee, as supplemented by a Second Supplemental Indenture, dated as of
October 15, 1996, between PageNet and Fleet National Bank; (y) 10.125% Senior
Subordinated Notes Due August 1, 2007 issued under and pursuant to an Indenture,
dated as of July 15, 1995, between PageNet and Shawmut Bank, N.A., as Trustee,
as supplemented by a First Supplemental Indenture, dated as of July 15, 1995,
between PageNet and Shawmut Bank, N.A.; and (z) 8.875% Senior Subordinated Notes
Due February 1, 2006 issued under and pursuant to an Indenture, dated as of
January 15, 1994, between PageNet and Shawmut Bank, N.A., as Trustee, as
supplemented by a First Supplemental Indenture, dated as of January 15, 1994,
between PageNet and Shawmut Bank, N.A. (collectively, the "PageNet Notes" and
together with the Arch Notes, the "Notes"). In the Exchange Offers, (i) Arch
will offer to exchange 66.1318 shares of Arch Common Stock for each $1,000
principal amount, together with all accreted or accrued interest thereon, of
outstanding Arch Notes and (ii) PageNet will offer to exchange a pro rata
portion of 616,830,757 PageNet Shares and, subject to Section 6.1(d) of this
Agreement, Distributed Interests representing the portion of such equity
ownership in the Distributed Subsidiary equal to 68.9% of the total equity
ownership of the Distributed Subsidiary for each PageNet Note (such pro rata
portion to be computed immediately prior to the Effective Time by dividing the
principal amount, together with all accrued interest thereon, of each PageNet
Note by the principal amount, together with all accrued interest thereon, of all
PageNet Notes). Calculations of share amounts for such purpose will be rounded
down to the nearest whole share and no fractional shares of Arch Common Stock or
PageNet Shares will be issued for Notes.

     (b) The obligations of Arch and PageNet under the Exchange Offers shall be
subject to the satisfaction of the conditions to the consummation of the Merger
set forth in Article VII of this

                                      A-27
<PAGE>   317

Agreement and, to the further condition that, (i) in the case of the PageNet
Exchange Offer, not less than 97.5% of the aggregate outstanding principal
amount of PageNet Notes and not less than a majority of the outstanding
principal amount of each series of PageNet Notes shall have been validly
tendered in accordance with the terms of the PageNet Exchange Offer prior to the
expiration date of the PageNet Exchange Offer and not withdrawn (such 97.5% of
the outstanding principal amount of the PageNet Notes and no less than a
majority of the outstanding principal amount of each series of PageNet Notes
tendered and not withdrawn being herein referred to as the "PageNet Minimum
Condition") and (ii) in the case of the Arch Exchange Offer, not less than 97.5%
(the "Arch Minimum Percent") of the aggregate outstanding principal amount of
Arch Notes shall have been validly tendered in accordance with the terms of the
Arch Exchange Offer prior to the expiration date of the Arch Exchange Offer and
not withdrawn; provided, however, that (x) PageNet may elect, in its sole
discretion, to waive the Arch Minimum Percent, or to lower such Arch Minimum
Percent to any level, and require the Arch Exchange Offer to be consummated at
such specified level (subject to applicable Law and the other provisions of this
Agreement), and (y) at any time after either the PageNet Minimum Condition or
the PageNet Conditions to the Prepackaged Plan have been satisfied, Arch may
elect, in its sole discretion, to lower the Arch Minimum Percent to any
percentage equal to or greater than 67% (such amount of Arch Notes tendered and
not withdrawn, as may be adjusted by either PageNet or Arch as set forth above,
being herein referred to as the "Arch Minimum Condition"). Except as otherwise
provided in this Agreement, no term or condition of the Exchange Offers may be
amended or modified without the written consent of the parties hereto, which
consent shall not be unreasonably withheld.

     (c) Holders of Notes who tender into the Exchange Offers will be required,
as a condition to a valid tender, to give their consent (the "Note Consents")
with respect to all Notes tendered by them to, with respect to the PageNet
Notes, the Prepackaged Plan and, with respect to all Notes (including the Arch
Notes), the following amendments to the respective indenture or supplemental
indentures, together with such additional amendments thereto or waivers thereof
as shall be determined and consented to by each of Arch and PageNet to be
necessary or desirable (the "Indenture Amendments"): (i) amendment of each such
indenture to the extent necessary, if any, to permit the completion of the
Merger, the Prepackaged Plan and the other transactions contemplated by this
Agreement; and (ii) amendments to eliminate (A) any covenants which may be
modified or eliminated by majority vote of the Notes, including without
limitation any covenants which restrict (s) the sale of assets, (t) any change
of control, (u) the incurrence of indebtedness, (v) the making of restricted
payments, (w) the existence of limitations on distributions by subsidiaries, (x)
the existence of liens, (y) transactions with affiliates or related persons or
(z) the issuance and sale of stock of subsidiaries, (B) any events of default
which relate to (x) the non-payment or acceleration of other indebtedness (or
notification of foreclosure proceedings with respect to property secured by
other indebtedness), (y) the failure to discharge judgments for the payment of
money, or (z) the bankruptcy or insolvency of subsidiaries, and (C) any
provisions which condition mergers or consolidations on compliance with any
financial criteria. Such holders will also be required, as a condition to a
valid tender, to waive (the "Note Waivers") any and all existing defaults on or
with respect to the Notes and any and all rights to rescind their acceptance of
the Exchange Offer after the Exchange Offers Expiration Date (as defined in
Section 6.18(h) hereof), such waiver of rescission rights to be subject,
however, to their withdrawal rights under applicable law and regulations, or to
claim any payments relating to the Notes tendered under applicable law and
regulations, and for any other relief, legal or equitable, based on any possible
future judicial, administrative or other governmental or legal determination
that the Note Consents or the adoption of any of the Indenture Amendments are
invalid or unenforceable. Notwithstanding anything to the contrary herein, the
Note Waivers shall not be deemed to cover claims for violations of federal or
state securities laws relating to the Exchange Offers.

     (d) PageNet and Arch each agrees, as to itself and its Subsidiaries, that
none of the information supplied or to be supplied by it or its Subsidiaries for
inclusion or incorporation by reference in: (i) (x) the Registration Statement
on Form S-4 to be filed with the SEC by Arch in connection with the issuance of
shares of Arch Common Stock in the Arch Exchange Offer (including the consent
solicitation and prospectus (the "Arch Exchange Prospectus" constituting a part
thereof) (the "Arch Exchange Registration Statement")) and (y) the Registration
Statement on Form S-4 to be filed with the SEC by

                                      A-28
<PAGE>   318

PageNet in connection with the issuance of PageNet Shares and Distributed
Interests in the PageNet Exchange Offer (including the consent solicitation and
prospectus (the "PageNet Exchange Prospectus" and, together with the Arch
Exchange Statement, the "Exchange Prospectuses" constituting a part thereof)
(the "PageNet Exchange Registration Statement" and, together with the Arch
Exchange Registration Statement, the "Exchange Registration Statements")) will,
at the time the Exchange Registration Statements become effective under the
Securities Act; and (ii) the Exchange Prospectuses and any amendment or
supplement thereto will, at the date of mailing to noteholders contain any
untrue statement of a material fact or omit to state any material fact required
to be liquidation therein or necessary in order to make the statements therein,
in light of the circumstances under which they were made, not misleading. If at
any time prior to the Effective Time any information relating to Arch or
PageNet, or any of their respective affiliates (as defined in SEC Rule 12b-2),
officers or directors, is discovered by Arch or PageNet which should be set
forth in an amendment or supplement to any of the Exchange Registration
Statements or the Exchange Prospectuses, so that any of such documents would not
include any misstatement of a material fact or would omit to state any material
fact required to be liquidation therein or necessary to make the statements
therein, in the light of the circumstances under which they were made, not
misleading, the party which discovers such information shall promptly notify the
other parties to this Agreement and an appropriate amendment or supplement
describing such information shall be promptly filed with the SEC and, to the
extent required by law, disseminated to the noteholders.

     (e) The PageNet Exchange Prospectus sent to the holders of the PageNet
Notes in connection with the PageNet Exchange Offer will also constitute a
disclosure statement for the purpose of soliciting the acceptances of such
holders for the Prepackaged Plan (as defined in Section 6.19). PageNet and Arch
shall consult with each other prior to sending the PageNet Exchange Prospectus
to the holders of the PageNet Notes for purposes of ensuring that such materials
comply with the disclosure requirements of the Bankruptcy Code and other
applicable law insofar as they relate to prepackaged plans.

     (f) Arch and PageNet shall promptly prepare Exchange Prospectuses, and
shall prepare and file with the SEC the Exchange Registration Statements as
promptly as practicable. Arch and PageNet each shall use its reasonable best
efforts to have each of the Exchange Registration Statements declared effective
under the Securities Act as promptly as practicable and on the same day as the
S-4 Registration Statement, and promptly thereafter mail the Exchange
Prospectuses to the noteholders of Arch and PageNet. Each party shall notify the
other of the receipt of the comments of the SEC and of any requests by the SEC
for amendments or supplements to the Exchange Prospectuses or the Exchange
Registration Statements or for additional information and shall promptly supply
one another with copies of all correspondence between any of them (or their
Representatives) and the SEC (or its staff) with respect thereto. If, at any
time prior to the expiration date of the Exchange Offers, any event shall occur
relating to or affecting Arch, PageNet, or their respective officers or
directors, which event should be described in an amendment or supplement to the
Exchange Prospectuses or the Exchange Registration Statements, the parties shall
promptly inform one another and shall cooperate in promptly preparing, filing
and clearing with the SEC and, if required by applicable securities laws,
mailing to Arch' or PageNet's noteholders, as the case may be, such amendment or
supplement.

     (g) Provided the conditions to the Exchange Offers referred to in Section
6.18(b) above have been satisfied or waived and Arch or PageNet, as the case may
be, has accepted for exchange Notes properly tendered and not withdrawn, Notes
that are not tendered into or accepted in the Exchange Offers will remain
outstanding as obligations of Arch or the Surviving Corporation, as the case may
be, after consummation of the Merger and Arch or the Surviving Corporation, as
the case may be, alone shall be obligated to comply with the terms thereof,
except as may otherwise be provided in the Prepackaged Plan or the Final
Confirmation Order (as defined in Section 6.19) if the Bankruptcy Case (as
defined in Section 6.19) is commenced. Such Notes shall be modified only to the
extent provided in the Indenture Amendments and the Note Consents.

     (h) The Exchange Offers will expire at 12:00 midnight, New York City time,
on the twentieth business day after such commencement, or, consistent with this
Agreement and the provisions of

                                      A-29
<PAGE>   319

Section 6.19, at such later time and date as PageNet and Arch shall select
consistent with applicable law and regulations (the "Exchange Offers Expiration
Date").

     (i) The Arch Common Stock or PageNet Shares and Distributed Interests, as
the case may be, to be issued in exchange for the Notes tendered and accepted in
the Exchange Offers will be so issued only after timely receipt by the exchange
agent selected jointly by Arch and PageNet (the "Notes Exchange Agent") of: (i)
certificates for all physically delivered Notes in proper form for transfer, or
timely confirmation of book-entry transfer of such Notes for such purposes; (ii)
a properly completed and duly executed letter of transmittal in the form
provided on behalf of Arch or the Surviving Corporation, as the case may be, for
such purpose; (iii) a duly executed form of Note Consent and Note Waiver; and
(iv) any other documents required by the letter of transmittal.

     (j) For purposes of the Exchange Offers, Arch or PageNet, as the case may
be, shall be deemed to have accepted for exchange the tendered Notes as, if and
when Arch or PageNet, as the case may be, gives oral or written notice to the
Notes Exchange Agent of such party's acceptance of such Notes for exchange. Each
of Arch and PageNet agree to simultaneously accept for exchange the Notes
pursuant to their respective Exchange Offers. The Notes Exchange Agent will act
as agent for the tendering holders for the purpose of receiving the Notes and
transmitting the Arch Common Stock, PageNet Shares or Distributed Interests, as
the case may be, in exchange therefor.

     (k) Arch and PageNet shall jointly establish such additional procedures and
requirements with respect to the conduct of the Exchange Offers and shall cause
the same to be communicated to holders of the Notes in such manner as they shall
determine to be necessary or appropriate, including procedures and requirements
as may be necessary to obtain confirmation of the Prepackaged Plan if the
Bankruptcy Case is commenced. All questions concerning the timeliness, validity,
form, eligibility, and acceptance for exchange or withdrawal of any tender of
the Notes pursuant to any of the procedures described herein or any additional
procedures established by the parties shall be determined jointly by the
parties, whose determinations shall be final and binding. Arch and PageNet, as
the case may be, also reserve in connection with their respective Exchange
Offers, the absolute right to: (i) waive any defect or irregularity in any
tender with respect to any particular Note or any particular holder; (ii) permit
a defect or irregularity to be corrected within such time as it may determine;
or (iii) reject the purported tender of any Note and interest coupons
appertaining thereto. Tenders shall not be deemed to have been received or
accepted until all defects and irregularities have been cured or waived within
such time as Arch or PageNet, as the case may be, may determine in its sole
discretion. None of Arch, PageNet or the Notes Exchange Agent or any other
person shall be under any duty to give notification of any defects or
irregularities relating to tenders or incur any liability for failure to give
such notification.

     (l) Each of PageNet and Arch shall accept the Notes tendered in their
respective Exchange Offer as of immediately prior to the Effective Time.

     (m) Promptly upon receipt of the consents of the holders of at least a
majority of the outstanding principal amount of a series of Notes, Arch or
PageNet, as the case may be, shall execute the applicable supplemental indenture
to be effective as of the Effective Time.

     6.19.  Bankruptcy Provisions.  As used in this Agreement, the term:

     "Bankruptcy Case" shall mean the bankruptcy case filed or stipulated to by
PageNet and its Subsidiaries under Chapter 11 of the Bankruptcy Code pursuant to
the terms hereof;

     "Bankruptcy Code" shall mean Title 11 of the United States Code, 11
U.S.C.sec.101 et seq., as now in effect or hereafter amended;

     "Bankruptcy Court" shall mean the court in which the Bankruptcy Case may be
filed or otherwise administered, including any court to which the Bankruptcy
Case may be transferred at any time under applicable law. PageNet and Arch
hereby agree that the U.S. bankruptcy court for the District of Delaware is the
appropriate venue for the Bankruptcy Case and that if the Bankruptcy Case is
filed by PageNet it will be filed in the District of Delaware;

                                      A-30
<PAGE>   320

     "Exit Financing" shall mean the senior secured debt financing referred to
in Section 6.17 hereof;

     "Final Confirmation Order" shall mean an order of the bankruptcy court
confirming the Prepackaged Plan in form and substance reasonably acceptable to
PageNet and Arch, which has not been amended, modified and added to without the
express consent of PageNet and Arch and as to which order as of the Effective
Time there is no stay or injunction;

     "Initial Determination Date" shall mean the date which is 60 days after the
date upon which the S-4 Registration Statement and the Exchange Registration
Statements are declared effective by the SEC;

     "Interim Financing" shall mean debt financing in an amount and on terms
reasonably acceptable to Arch and appropriate to permit PageNet to continue its
business and operations in the ordinary course following the filing of the
Bankruptcy Case;

     "Prepackaged Plan" shall mean the "prepackaged" plan of reorganization for
PageNet and its Subsidiaries that (1) is prepared by PageNet and its
Subsidiaries in accordance with, and intended by PageNet and its Subsidiaries to
be confirmed under, the provisions of Chapter 11 of the Bankruptcy Code
(including the confirmation requirements set forth in Section 1129 thereof), (2)
consists of terms, conditions and provisions that are mutually acceptable to
Arch and PageNet (it being understood and agreed by PageNet and Arch that
neither party will unreasonably withhold its consent to proposed amendments to
non-material provisions of the Prepackaged Plan) and are not inconsistent with
the terms, conditions and provisions of this Agreement, (3) is included in the
SEC disclosure materials sent to holders of the PageNet Notes in connection with
the Exchange Offers pursuant to Sections 6.18(a) and (e) of this Agreement and
(4) which contains terms intended to implement this Agreement and other terms
which are not inconsistent with this Agreement, together with any and all
changes, amendments or modifications to, or restatements of, such prepackaged
plan which with respect to material provisions have been agreed to by Arch and
PageNet, without regard to whether such changes, amendments, modifications and
restatements are made to the Prepackaged Plan before or after the commencement
of the Bankruptcy Case;

     "PageNet Conditions to the Prepackaged Plan" shall mean (i) the Requisite
Bankruptcy Vote of the PageNet Notes, (ii) the Requisite Bankruptcy Vote of the
PageNet Secured Creditors and (iii) the Interim Financing;

     "Requisite Bankruptcy Vote of the PageNet Notes" shall mean a vote in favor
of the Prepackaged Plan by the holders of at least two-thirds of the outstanding
principal amount of the PageNet Notes that are actually voted, and a vote in
favor of the Prepackaged Plan by a majority in number of the holders of the
PageNet Notes that actually vote;

     "Requisite Bankruptcy Vote of the PageNet Secured Creditors" shall mean a
vote in favor of the Prepackaged Plan by the holders of at least two-thirds of
the outstanding indebtedness owed under the PageNet senior credit facilities
that are actually voted, and a vote in favor of the Prepackaged Plan by a
majority in number of the holders of the indebtedness under the PageNet senior
credit facilities that actually vote;

     "Requisite Conditions to the Prepackaged Plan" shall mean (i) the PageNet
Conditions to the Prepackaged Plan, (ii) the Arch Conditions to the Prepackaged
Plan, and (iii) that either the Exit Financing has been obtained or upon entry
of the Final Order will be obtained;

     "Arch Conditions to the Prepackaged Plan" shall mean the (i) Arch Minimum
Condition and (ii) Arch Stockholders Approval.

     (a) Notwithstanding any other provision of this Agreement to the contrary,
in the event that:

          (i) prior to or at the Initial Determination Date the PageNet Minimum
     Condition and the Arch Minimum Condition are satisfied, and the PageNet
     Stockholders Approval and the Arch Stockholders Approvals are obtained,
     then the Exchange Offers shall be consummated pursuant to the terms hereof,
     the Bankruptcy Case shall not be filed and the Prepackaged Plan shall be
     abandoned, unless

                                      A-31
<PAGE>   321

     PageNet and Arch agree that the filing of the Bankruptcy Case and the
     confirmation of the Prepackaged Plan are in the best interests of PageNet
     and Arch, notwithstanding satisfaction of the PageNet Minimum Condition and
     the Arch Minimum Condition;

          (ii) at the Initial Determination Date, the PageNet Minimum Condition
     is not satisfied or the PageNet Stockholders Approval is not obtained but
     the Requisite Conditions to the Prepackaged Plan are satisfied, then either
     (x) (1) PageNet shall file the Bankruptcy Case (in the U.S. Bankruptcy
     Court for the District of Delaware or such other bankruptcy court as
     PageNet and Arch mutually agree) and seek confirmation of the Prepackaged
     Plan by the bankruptcy court, and (2) Arch shall be bound by all of the
     terms hereof, and shall consummate the Merger through the Prepackaged Plan
     if such plan is confirmed by the bankruptcy court by a Final Confirmation
     Order within 120 days of the commencement of the Bankruptcy Case, or such
     later date as is mutually agreed to in writing by Arch and PageNet, and if
     the other conditions to the Merger set forth in Article VII hereof (other
     than Section 7.1(a)(2) and 7.1(g)(ii), which shall have been satisfied by
     entry of the Final Confirmation Order) are satisfied after entry of the
     Final Confirmation Order but prior to the Termination Date, as such date
     may be extended in accordance with Section 8.2, or (y) PageNet shall
     terminate this Agreement and simultaneously pay to Arch the Arch
     Termination Fee pursuant to Section 8.5(c) hereof. In the event the
     Bankruptcy Case is commenced, Arch shall:

             (w) support assumption of this Agreement by PageNet as a
        debtor-in-possession pursuant to 11 U.S.C. sec.365;

             (x) enter into a new agreement identical to the terms of this
        Agreement with PageNet as a debtor-in-possession after commencement of
        the Bankruptcy Case, in the event PageNet and Arch agree (upon the
        advice of counsel) or the bankruptcy court determines that applicable
        law prohibits assumption of this Agreement by PageNet as a
        debtor-in-possession pursuant to 11 U.S.C. sec.365(c)(2);

             (y) support confirmation of the Prepackaged Plan and all actions
        and pleadings reasonably undertaken by PageNet in the Bankruptcy Case to
        achieve confirmation thereof; and

             (z) oppose any effort by any party to (1) dismiss the Bankruptcy
        Case or convert the Bankruptcy Case to a case under chapter 7 of the
        Bankruptcy Code, or (2) defeat confirmation of the Prepackaged Plan;

          (iii) at the Initial Determination Date, the PageNet Minimum Condition
     is not satisfied or the PageNet Stockholders Approval is not obtained and
     the Requisite Conditions to the Prepackaged Plan are not satisfied, then
     the Initial Determination Date shall be extended to the earlier of (x) the
     date upon which the PageNet Minimum Condition and the Arch Minimum
     Condition are satisfied, and the PageNet Stockholders Approval and the Arch
     Stockholders Approval are obtained, (y) the date upon which the Requisite
     Conditions to the Prepackaged Plan are satisfied and (z) June 30, 2000 (the
     "Extended Determination Date"). If the PageNet Minimum Condition and the
     Arch Minimum Condition are satisfied and the PageNet Stockholders Approval
     and the Arch Stockholders Approval are obtained prior to June 30, 2000,
     then the provisions of Section 6.19(a)(i) of this Agreement shall apply. If
     the Requisite Conditions to the Prepackaged Plan are satisfied prior to
     June 30, 2000, then the provisions of Section 6.19(a)(ii) of this Agreement
     shall apply;

          (iv) at any time after the date of this Agreement, the Board of
     Directors of PageNet determines that the filing of the Bankruptcy Case is
     in the best interests of PageNet, then (1) PageNet may file the Bankruptcy
     Case and shall seek, to the extent not already satisfied, to satisfy the
     PageNet Conditions to the Prepackaged Plan and otherwise seek confirmation
     of the Prepackaged Plan by the bankruptcy court, and (2) Arch shall (x)
     seek, to the extent not already satisfied, to satisfy the Arch Conditions
     to the Prepackaged Plan and (y) be bound by all of the terms hereof, and
     shall consummate the Merger through the Prepackaged Plan if such plan is
     confirmed by the bankruptcy court by a Final Confirmation Order (provided
     that such Final Confirmation Order shall be entered by no later than
     December 31, 2000, or such later date as is mutually agreed to by Arch and

                                      A-32
<PAGE>   322

     PageNet) and if the other conditions to the Merger set forth in Article VII
     hereof (other than Section 7.1(a)(2) and 7.1(g)(ii), which shall have been
     satisfied by entry of the Final Confirmation Order) are satisfied after
     entry of the Final Confirmation Order but prior to the Termination Date, as
     such date may be extended in accordance with Section 8.2;

          (v) an Involuntary Insolvency Event occurs prior to a voluntary
     commencement of the Bankruptcy Case pursuant to Sections 6.19(a)(ii), (iii)
     or (iv), (1) (A) if the date of the Insolvency Event (the "Involuntary
     Insolvency Event Date") is prior to the Initial Determination Date, PageNet
     shall have up to 120 days after such Involuntary Insolvency Event Date to
     obtain from the appropriate court an order which dismisses such Involuntary
     Insolvency Event (including, with respect to an involuntary petition filed
     in any bankruptcy court, an order which holds or requires that the court
     abstain from adjudicating the petition pursuant to 11 U.S.C. sec.305) and
     which order is not subject to a stay or injunction and is not subject to an
     appeal and all periods for taking an appeal shall have expired (the
     "Dismissal Order"), so that the Exchange Offers may be completed, and this
     Agreement shall remain in full force and effect and Arch shall be bound by
     all of the terms hereof or (B) if an Involuntary Insolvency Event occurs
     after the Initial Determination Date, and as of the Involuntary Insolvency
     Event Date the PageNet Minimum Condition and the Arch Minimum Condition
     have been satisfied and the PageNet Stockholders Approval and Arch
     Stockholders Approval have been obtained, then (x) PageNet shall have up to
     120 days after such Involuntary Insolvency Event Date to obtain entry of
     the Dismissal Order, and (y) this Agreement shall remain in full force and
     effect and Arch shall consummate the Merger (outside of bankruptcy, unless
     PageNet and Arch mutually consent to file the Bankruptcy Case as
     contemplated by Section 6.19(a)(i) hereof) pursuant to the terms hereof
     provided that such Dismissal Order has been obtained before the expiration
     of such 120-day period, (2) if on the Involuntary Insolvency Event Date the
     PageNet Minimum Condition has not been satisfied or PageNet Stockholders
     Approval has not been obtained but the Requisite Conditions to the
     Prepackaged Plan have been satisfied, then PageNet shall stipulate to
     bankruptcy relief under Chapter 11 of the Bankruptcy Code and the
     provisions of Section 6.19(a)(ii)(x)(1) of this Agreement shall apply
     (including the provisions therein requiring Arch to be obligated to
     consummate the Merger pursuant to the Prepackaged Plan); and (3) if on the
     Involuntary Insolvency Event Date the PageNet Minimum Condition has not
     been satisfied or PageNet Stockholders Approval or Arch Stockholders
     Approval has not been obtained and the Requisite Conditions to the
     Prepackaged Bankruptcy have not been obtained, then PageNet may (but shall
     not be obligated to) stipulate to bankruptcy relief under Chapter 11 of the
     Bankruptcy Code and the provisions of Section 6.19(a)(iv) of this Agreement
     shall apply (including the provisions therein requiring Arch to be
     obligated for a period of time to consummate the Merger pursuant to the
     Prepackaged Plan). For purposes hereof, an "Involuntary Insolvency Event"
     shall mean any filing of an involuntary bankruptcy petition against PageNet
     or any of its Subsidiaries by any party, or the appointment under other
     applicable state or federal law of a liquidator or a trustee for PageNet or
     any of its Subsidiaries.

     (b) As soon as practicable after entering into this Agreement, PageNet and
Arch shall jointly prepare the Prepackaged Plan in form and substance
satisfactory to PageNet and Arch. PageNet shall include the Prepackaged Plan and
related solicitation materials (including a ballot) in the PageNet Exchange
Prospectus, the solicitation materials sent to the PageNet Secured Creditors,
and (to the extent PageNet and Arch deem necessary) in any materials sent to the
holders of PageNet Shares. PageNet and Arch shall cooperate to ensure that the
Exchange Offers, including the disclosures to holders of PageNet Notes made in
connection therewith, and the solicitation of PageNet Secured Creditors comply
with the disclosure requirements of the Bankruptcy Code and applicable law. The
Prepackaged Plan may not be amended, modified or added to in any material
respect without the written consent of PageNet and Arch.

     (c) Notwithstanding any other provision hereof to the contrary, (i) the
filing of the Bankruptcy Case, the operation of PageNet's business in accordance
with the Bankruptcy Code or the pendency of the Bankruptcy Case, or (ii) the
occurrence of an Involuntary Insolvency Event with respect to PageNet shall not
be considered in and of itself a Material Adverse Effect for purposes of this
Agreement.

                                      A-33
<PAGE>   323

     (d) On the same day that the Bankruptcy Case is filed, an order for relief
is consented to under Section 6.19(a)(v) of this Agreement or an order for
relief is entered, as applicable, PageNet shall file a motion (the "Initial
Merger Motion") for expedited determination of approval of Section 6.2 hereof
concerning Acquisition Proposals (the "Exclusivity Provision"), Section 8.5(c)
concerning the Arch Termination Fee and Section 8.5(b) concerning the PageNet
Termination Fee in form and substance acceptable to Arch, PageNet shall use its
best efforts to obtain an order approving the Initial Merger Motion (the
"Initial Merger Order") within 15 days of the commencement of the Bankruptcy
Case, but in no event not later than 30 days after the commencement thereof,
which order shall be in form and substance acceptable to Arch.

     (e) PageNet shall promptly provide to Arch with drafts of all documents,
motions, orders, filings or pleadings that PageNet proposes to file with the
bankruptcy court and will provide Arch with reasonable opportunity prior to the
filing thereof to review such filings to the extent reasonably practicable.
PageNet shall consult and cooperate with Arch with respect to all such filings.

     (f) PageNet and Arch shall use their best efforts to cause the transactions
contemplated by this Agreement and the Prepackaged Plan to be consummated in
accordance with the terms hereof and thereof, and without limiting the
generality of the foregoing shall use their best efforts to obtain all necessary
approvals, waivers, consents, permits, licenses, registrations and other
authorizations required in connection with this Agreement and the Prepackaged
Plan and the transactions contemplated hereby and thereby, including without
limitation, entry of the Final Confirmation Order.

     (g) PageNet shall cause its Subsidiaries to take all actions and to execute
all agreements and documents which are necessary or useful in the preparation of
and commencement of the Bankruptcy Case, the preparation, filing and prosecution
of the Prepackaged Plan and the entry of the Final Confirmation Order.

     (h) Concurrent with the commencement of the Exchange Offers, PageNet shall
send solicitation and disclosure materials to its creditors as would bind such
creditors to the Prepackaged Plan under the provisions of the Bankruptcy Code.
PageNet shall make such solicitations of its creditors (in addition to
solicitations of holders of the PageNet Notes) as PageNet and Arch determine is
necessary to facilitate and expedite the confirmation of the Prepackaged Plan in
the event of any potential Bankruptcy Case.

     (i) If the Bankruptcy Case is commenced pursuant to Section 6.19(a)(iv) or
(v), then Arch shall not be subject to the restrictions set forth in Section 6.2
or the restrictions on the conduct of its business set forth in Section
6.1(b)(viii) with respect to merger or acquisition transactions or the other
restrictions set forth in Section 6.1(b), to the extent such restrictions would
impede or prohibit Arch from entering into another merger or acquisition
transaction; provided, however, that Arch may not enter into another merger or
acquisition transaction that would prevent, materially impair or materially
delay its ability to consummate the Merger or the other transactions
contemplated hereby; provided, further, that if Arch enters into a merger or
acquisition transaction following the commencement of the Bankruptcy Case
pursuant to Section 6.19(a)(iv) or (v) and as a result of such event PageNet is
required to amend its disclosure statement and resolicit the votes of its
creditors, then the time within which the Final Confirmation Order must be
obtained shall be extended for an additional 90 days.

     6.20.  Rights Agreement.  At or prior to the Effective Time, the Arch Board
of Directors shall take all action required to render inapplicable the Arch
Rights Agreement to the Merger and the transactions contemplated by this
Agreement. At or prior to the Effective Time, the Arch Board of Directors shall
take all action required by Section 5.1(j)(ii) of this Agreement and the PageNet
Board of Directors shall take all action required by Section 5.1(j)(i) of this
Agreement.

                                      A-34
<PAGE>   324

     6.21.  Preferred Stock.

     (a) Arch shall use its reasonable best efforts to obtain, as soon as
practicable after the date of this Agreement, the written agreement of each
holder of Arch Series C Preferred Shares (such written agreement referred to
herein as the "Series C Consent Agreement"), pursuant to which: (i) such holder
agrees to vote in favor of an amendment to the Arch certificate of incorporation
pursuant to which each Series C Convertible Preferred Share shall be converted
at the Effective Time into 8.416568 shares (the "Series C Exchange Ratio") of
Arch Common Stock, subject to adjustment as provided in Section 4.4 (the "Series
C Consideration"), (ii) waive any and all rights such holder may have under
section 7A of the Certificate of Designations, Preferences and Relative,
Participating, Optional or other Special Rights of Series C Convertible Stock of
Arch; and (iii) Arch agrees to register for sale by such holder and certain
transferees, the shares of Arch Common Stock received by such holder, unless
such shares would be freely tradeable under applicable securities laws. When
executed and delivered by Arch, the Series C Consent Agreement will be a valid
and binding agreement of Arch, enforceable against Arch in accordance with its
terms, subject to the Bankruptcy and Equity Exception.

     (b) The exchange of certificates formerly representing Arch Series C
Preferred Shares shall be effected by the Exchange Agent (as defined in Section
4.2) pursuant to the provisions set forth in Section 4.2 of this Agreement. The
term "Certificate" shall include certificates formerly representing Arch Series
C Preferred Shares.

     6.22.  Spinoff.  Prior to the Closing, the Board of Directors of PageNet
will declare a dividend (the "Spinoff Dividend"), payable to those holders of
PageNet Shares who hold PageNet Shares immediately prior to the acceptance of
PageNet Notes in the PageNet Exchange Offer (the "Spinoff Record Date"), of
interests (the "Distributed Interests") representing the portion of such equity
ownership in Silverlake Communications, Inc. (also doing business as VAST
Solutions, Inc. and VAST Solutions) (the "Distributed Subsidiary") equal to (x)
subject to Section 6.1(d), 11.6% of the total equity ownership of the
Distributed Subsidiary divided by (y) the number of PageNet Shares issued and
outstanding at the Spinoff Record Date (the issuance of the Spinoff Dividend
shall be referred to herein as the "Spinoff"). Payment of the Spinoff Dividend
declared by the Board of Directors of PageNet shall be conditioned upon the
occurrence of (i) either (A) the satisfaction of the PageNet Minimum Condition
and the acceptance of the PageNet Notes or (B) the filing of the Final
Confirmation Order and (ii) the consummation of the Merger. PageNet and the
Distributed Subsidiary shall take such action reasonably necessary (including
filings with and no- action requests of the SEC and communications with
stockholders) to effectuate the Spinoff. Upon satisfaction of the conditions to
the Spinoff Dividend, Arch shall use its reasonable best efforts to consummate,
or cause to be consummated the Spinoff as promptly as practicable after the
Effective Time.

                                  ARTICLE VII.

                                   CONDITIONS

     7.1.  Conditions to Each Party's Obligation to Effect the Merger.  The
respective obligation of each party to effect the Merger is subject to the
satisfaction or waiver, if applicable, at or prior to the Effective Time of each
of the following conditions:

          (a) Stockholder Approval.  The Arch Stockholders Approval shall have
     been obtained, and PageNet shall have obtained either (1) the PageNet
     Stockholders Approval or (2) entry of the Final Confirmation Order
     confirming the Prepackaged Plan, such that this Agreement and the
     transactions contemplated hereby can be accomplished without the approval
     of the holders of the PageNet Shares.

          (b) NASDAQ Listing.  The shares of Arch Common Stock issuable pursuant
     to this Agreement shall have been approved for listing (either before or
     after the execution of this Agreement) on the NASDAQ.

                                      A-35
<PAGE>   325

          (c) Governmental Regulations.  The waiting period applicable to the
     consummation of the Merger under the HSR Act shall have expired or been
     terminated, and all other consents, permits, licenses, and approvals for
     the Merger and the other transactions contemplated by this Agreement
     required by the Governmental Regulations, as well as all other material
     PageNet Required Consents and Arch Required Consents, shall have been
     obtained and shall have become Final Orders. For purposes of this
     agreement, a "Final Order" shall mean an action taken or order issued by
     the applicable Governmental Entity as to which (i) no request for stay by
     such Governmental Entity of the action or order is pending, no such stay is
     in effect, and, if any deadline for filing any such request is designated
     by statute or regulation, it is passed; (ii) no petition for rehearing or
     reconsideration of the action or order is pending before the Governmental
     Entity and the time for filing any such petition is passed; (iii) the
     Governmental Entity does not have the action or order under reconsideration
     on its own motion and the time for such reconsideration has passed; (iv)
     the action or order is not then under active judicial review, there is no
     notice of appeal or other application for judicial review pending, and the
     deadline for filing such notice of appeal or other application for judicial
     review has passed; and (v) with respect to an action taken or order issued
     by the Governmental Entity granting consent to the Merger, such consent
     shall be without material adverse conditions, other than conditions that
     have been agreed to by PageNet and Arch or that are routine conditions with
     respect to transfer of this nature.

          (d) Laws and Orders.  No Governmental Entity of competent jurisdiction
     shall have enacted, issued, promulgated, enforced or entered any Law
     (whether temporary, preliminary or permanent) that is in effect and
     restrains, enjoins or otherwise prohibits consummation of the Merger, the
     Exchange Offers, the Spinoff or the other transactions contemplated by this
     Agreement (collectively, an "Order"), and no Governmental Entity shall have
     instituted any proceeding or threatened to institute any proceeding seeking
     any such Order.

          (e) S-4.  The S-4 Registration Statement and the Exchange Registration
     Statements shall have become effective under the Securities Act. No stop
     order suspending the effectiveness of the S-4 Registration Statement or the
     Exchange Registration Statements shall have been issued, and no proceedings
     for that purpose shall have been initiated or be threatened by the SEC.

          (f) Senior Credit Facilities.  Arch and its subsidiaries, including
     PageNet after giving effect to the Merger, will have senior credit
     facilities in an amount not less than $1.3 billion.

          (g) Exchange Offers/Bankruptcy.  Either (i) the PageNet Minimum
     Condition and the Arch Minimum Condition shall have been satisfied or (ii)
     if the PageNet Minimum Condition has not been satisfied, the Final
     Confirmation Order shall have been entered confirming the Prepackaged Plan
     and the Arch Minimum Condition shall have been obtained and all conditions
     to the Effective Time occurring under the Prepackaged Plan shall have been
     satisfied.

          (h) Blue Sky Approvals.  Arch shall have received all state securities
     and "blue sky" permits and approvals necessary to consummate the
     transactions contemplated by this Agreement.

          (i) Expected Out-of-Pocket Income Tax Liability.  PageNet, Arch,
     Merger Sub and their respective subsidiaries shall not be reasonably
     expected to incur out-of-pocket income tax liability in their respective
     taxable periods which include the Effective Time resulting directly from
     the consummation of the Merger, the Exchange Offers and the Spinoff in
     excess of $25 million in the aggregate. In making this determination the
     following shall be taken into account: (1) the amount of cancellation of
     indebtedness income, if any, includible in gross income, (2) gain, if any,
     incurred as a result of the distribution or transfer of appreciated assets,
     and (3) the amount of losses, credits or deductions, including both
     available net operating loss or credit carryforwards and losses, deductions
     or credits expected to be generated in the taxable periods which include
     the Effective Time, but excluding any expected carrybacks from subsequent
     taxable periods.

                                      A-36
<PAGE>   326

     7.2.  Conditions to Obligations of Arch and Merger Sub.  The obligations of
Arch and Merger Sub to effect the Merger are also subject to the satisfaction or
waiver by Arch at or prior to the Effective Time of the following conditions:

          (a) Representations and Warranties.  The representations and
     warranties of PageNet set forth in this Agreement (other than those
     representations and warranties which would be breached as a result of the
     filing or conduct of the Bankruptcy Case or the occurrence of an
     Involuntary Insolvency Event with respect to PageNet): (i) to the extent
     qualified by materiality, shall be true and correct; and (ii) to the extent
     not qualified by materiality, shall be true and correct (except that this
     clause (ii) shall be deemed satisfied so long as any failures of such
     representations and warranties to be true and correct, taken together,
     would not reasonably be expected to have a Material Adverse Effect on
     PageNet and would not reasonably be expected to have a material adverse
     effect on the expected benefits of the Merger to Arch), in the case of each
     of clauses (i) and (ii), as of the date of this Agreement and (except to
     the extent such representations and warranties speak as of an earlier date)
     as of the Closing Date as though made on and as of the Closing Date, and
     Arch shall have received a certificate signed on behalf of PageNet by an
     executive officer of PageNet to such effect.

          (b) Performance of Obligations of PageNet.  PageNet shall have
     performed in all material respects all of its covenants, agreements and
     obligations set forth in this Agreement at or prior to the Closing Date,
     and Arch shall have received a certificate signed on behalf of PageNet by
     an executive officer of PageNet to such effect.

          (c) Consents Under Agreements.  PageNet shall have obtained the
     consent or approval of each Person whose consent or approval shall be
     required in order to consummate the transactions contemplated by this
     Agreement under any Contract to which PageNet or any of its Subsidiaries is
     a party (other than consents or waivers relating to the Bankruptcy Case or
     the occurrence of an Involuntary Insolvency Event), except those for which
     the failure to obtain such consent or approval, individually or in the
     aggregate, is not reasonably likely to have, a Material Adverse Effect on
     PageNet or a material adverse effect on the expected benefits of the Merger
     to Arch.

          (d) Tax Opinion.  Arch shall have received the opinion of Hale and
     Dorr LLP, counsel to Arch, dated the Closing Date, to the effect that the
     Merger will be treated for federal income tax purposes as a reorganization
     within the meaning of Section 368(a) of the Code, and that each of Arch,
     Merger Sub and PageNet will be a party to that reorganization within the
     meaning of Section 368(b) of the Code. Such opinion shall be based on
     certain assumptions concerning the fair market value of stock and
     securities to be surrendered and issued in the Merger, the Exchange Offers
     and the Spinoff, which PageNet, Arch and, with respect to PageNet, Houlihan
     Lokey Howard & Zukin Financial Advisors, Inc., and, with respect to Arch,
     Bear, Stearns & Co. Inc. will certify as being reasonable. In addition, in
     rendering such opinions, counsel may rely upon representations and
     certificates given for this purpose by responsible officers of PageNet,
     Arch and Merger Sub.

          (e) Certificate.  PageNet shall have delivered to Arch a certificate
     (without qualification as to knowledge or materiality or otherwise) to the
     effect that each of the conditions specified in Section 7.2 is satisfied in
     all respects, that the PageNet Stockholders Meeting has been convened
     (unless the Bankruptcy Case precedes the scheduled date of such meeting),
     and that the actions set forth in Section 6.5(a) of this Agreement have
     been adopted and approved in accordance with such section (except to the
     extent such approval is not required by reason of the entry of the Final
     Confirmation Order).

     7.3.  Conditions to Obligation of PageNet.  The obligation of PageNet to
effect the Merger is also subject to the satisfaction or waiver by PageNet at or
prior to the Effective Time of the following conditions:

          (a) Representations and Warranties.  The representations and
     warranties of Arch and Merger Sub set forth in this Agreement: (i) to the
     extent qualified by materiality, shall be true and correct; and (ii) to the
     extent not qualified by materiality, shall be true and correct (except that
     this clause (ii) shall be deemed satisfied so long as any failures of such
     representations and warranties to be true and correct, taken together,
     would not reasonably be expected to have a Material Adverse Effect and

                                      A-37
<PAGE>   327

     would not reasonably be expected to have a material adverse effect on the
     expected benefits of the Merger to PageNet), in the case of each of clauses
     (i) and (ii), as of the date of this Agreement and (except to the extent
     such representations and warranties speak as of an earlier date) as of the
     Closing Date as though made on and as of the Closing Date, and PageNet
     shall have received a certificate signed on behalf of Arch and Merger Sub
     by an executive officer of Arch to such effect.

          (b) Performance of Obligations of Arch.  Each of Arch and Merger Sub
     shall have performed in all material respects all of its covenants,
     agreements and obligations set forth in this Agreement at or prior to the
     Closing Date, and PageNet shall have received a certificate signed on
     behalf of Arch and Merger Sub by an executive officer of Arch to such
     effect.

          (c) Consents Under Agreements.  Arch shall have obtained the consent
     or approval of each Person whose consent or approval shall be required in
     order to consummate the transactions contemplated by this Agreement under
     any Contract to which Arch or any of its Subsidiaries is a party, except
     those for which the failure to obtain such consent or approval,
     individually or in the aggregate, is not reasonably likely to have, a
     Material Adverse Effect on Arch or a material adverse effect on the
     expected benefits of the Merger to PageNet.

          (d) Tax Opinion.  PageNet shall have received the opinion of Mayer,
     Brown & Platt, counsel to PageNet, dated the Closing Date, to the effect
     that the Merger will be treated for federal income tax purposes as a
     reorganization within the meaning of Section 368(a) of the Code, and that
     each of Arch, Merger Sub and PageNet will be a party to that reorganization
     within the meaning of Section 368(b) of the Code. Such opinion shall be
     based on certain assumptions concerning the fair market value of stock and
     securities to be surrendered and issued in the Merger, the Exchange Offers
     and the Spinoff, which PageNet, Arch and, with respect to PageNet, Houlihan
     Lokey Howard & Zukin Financial Advisors, Inc., and, with respect to Arch,
     Bear, Stearns & Co. Inc. will certify as being reasonable. In addition, in
     rendering such opinions, counsel may rely upon representations and
     certificates given for this purpose by responsible officers of PageNet and
     Arch.

          (e) Certificate.  Arch shall have delivered to PageNet a certificate
     (without qualification as to knowledge or materiality or otherwise) to the
     effect that each of the conditions specified in Section 7.3 (a)-(d) is
     satisfied in all respects, that the Arch Stockholders Meeting has been
     convened, and that the actions set forth in Section 6.5(b) have been
     adopted and approved in accordance with such section.

          (f) Series C Consent Agreement.  The Series C Consent Agreement will
     be in full force and effect, Arch shall not be in breach or default of the
     Series C Consent Agreement, and to the actual knowledge of the
     Knowledgeable Executives of Arch, there shall not exist a breach or default
     under the Series C Consent Agreement by any other party thereto.

          (g) Spinoff.  The Spinoff Dividend may be declared pursuant to Section
     6.22 of this Agreement or the Final Confirmation Order shall have been
     entered confirming the Prepackaged Plan.

                                 ARTICLE VIII.

                                  TERMINATION

     8.1.  Termination by Mutual Consent.  This Agreement may be terminated and
the Merger may be abandoned at any time prior to the Effective Time, whether
before or after the approval by stockholders of PageNet or Arch referred to in
Section 7.1(a), by mutual written consent of PageNet and Arch, through action of
their respective Boards of Directors.

     8.2.  Termination by Either Arch or PageNet.  This Agreement may be
terminated and the Merger may be abandoned at any time prior to the Effective
Time by action of the Board of Directors of either Arch or PageNet if: (i) the
Merger shall not have been consummated by June 30, 2000 if no Bankruptcy Case
has been filed by that date or 30 days following the date by which the Final
Confirmation Order must be entered under Section 6.19(a) (the "Termination
Date"); provided, however, that either party

                                      A-38
<PAGE>   328

shall have the option, in its sole discretion, to extend the Termination Date
for an additional period of time not to exceed 90 days if the sole reason that
the Merger has not been consummated by such date is that the condition set forth
in Section 7.1(c) has not been satisfied due to the failure to obtain the
necessary consents and approvals under applicable Governmental Regulations and
Arch or PageNet are still attempting to obtain such necessary consents and
approvals under applicable Governmental Regulations or are contesting the
refusal of the relevant Government Entities to give such consents or approvals
in court or through other applicable proceedings; (ii) the PageNet Stockholders
Meeting and the Arch Stockholders Meeting shall have been held and completed,
but the PageNet Stockholders Approval or the Arch Stockholders Approval, to the
extent required by Section 7.1(a), shall not have occurred; or (iii) any Order
permanently restraining, enjoining or otherwise prohibiting consummation of the
Merger shall become final and non-appealable (whether before or after the
PageNet Stockholders Approval or the Arch Stockholders Approval); provided,
further, that the right to terminate this Agreement pursuant to clause (i) above
shall not be available to any party that has breached in any material respect
its obligations under this Agreement in any manner that shall have proximately
contributed to the failure of the Merger to be consummated.

     8.3.  Termination by PageNet.  This Agreement may be terminated and the
Merger may be abandoned at any time prior to the Effective Time, before or after
the PageNet Stockholder Approval referred to in Section 7.1(a), by action of the
Board of Directors of PageNet if:

          (a) the Board of Directors of Arch shall have withdrawn or adversely
     modified its approval or recommendation of this Agreement;

          (b) there has been a breach by Arch or Merger Sub of any
     representation, warranty, covenant or agreement contained in this Agreement
     which both: (i) would result in a failure of a condition set forth in
     Section 7.3(a) or 7.3(b); and (ii) cannot be or is not cured prior to the
     Termination Date;

          (c) PageNet has received a Superior Proposal, has otherwise complied
     with the requirements of Section 6.2, provides Arch with all of the
     material terms of Superior Proposal at least two business days prior to
     termination and simultaneously with such termination pays to Arch the Arch
     Termination Fee required by Section 8.5(c); or

          (d) pursuant to Section 6.19(a)(ii), PageNet shall not file the
     Bankruptcy Case and seek confirmation of the Prepackaged Plan by the
     bankruptcy court and simultaneously pays to Arch the Arch Termination Fee.

     8.4.  Termination by Arch.  This Agreement may be terminated and the Merger
may be abandoned at any time prior to the Effective Time, before or after the
Arch Stockholder Approval referred to in Section 7.1(a), by action of the Board
of Directors of Arch if:

          (a) the Board of Directors of PageNet shall have withdrawn or
     adversely modified its approval or recommendation of this Agreement to do
     so;

          (b) there has been a breach by PageNet of any representation,
     warranty, covenant or agreement contained in this Agreement which both: (i)
     would result in a failure of a condition set forth in Section 7.2(a) or
     7.2(b); and (ii) cannot be or is not cured prior to the Termination Date,
     other than a breach that results solely from the filing or conduct of the
     Bankruptcy Case consistent with the terms of this Agreement or solely from
     the occurrence of an Involuntary Insolvency Event with respect to PageNet;

          (c) the Initial Merger Order has not been entered within 30 days of
     the commencement of the Bankruptcy Case;

          (d) the Final Confirmation Order is not entered within the time
     permitted by Section 6.19(a);

          (e) the Prepackaged Plan is amended, modified or added to in violation
     of Section 6.19(b); or

          (f) Arch has received a Superior Proposal, has otherwise complied with
     the requirements of Section 6.2, provides PageNet with all of the material
     terms of the Superior Proposal at least two business days prior to such
     termination and simultaneously pays to PageNet the PageNet Termination Fee
     required by Section 8.5(b).

                                      A-39
<PAGE>   329

     8.5.  Effect of Termination and Abandonment.

          (a) In the event of termination of this Agreement and the abandonment
     of the Merger pursuant to this Article VIII, this Agreement (other than as
     set forth in Section 9.1) shall become void and of no effect with no
     liability (other than as set forth in Section 8.5(b) or (c), or in the
     proviso at the end of this sentence) on the part of any party to this
     Agreement or of any of its directors, officers, employees, agents, legal or
     financial advisors or other representatives; provided, however, no such
     termination shall relieve any party to this Agreement from any liability
     for damages resulting from any breach of this Agreement.

     (b) In the event that: (i) an Acquisition Proposal shall have been made to
Arch or have been made directly to Arch' stockholders or noteholders generally
or any Person shall have publicly announced an intention (whether or not
conditional) to make an Acquisition Proposal and thereafter: (A) Arch'
stockholders do not adopt this Agreement or the other transactions contemplated
hereby at the Arch Stockholders Meeting or Arch' noteholders do not satisfy the
Arch Minimum Condition with respect to the Arch Notes; (B) this Agreement is
terminated by either Arch or PageNet pursuant to the terms of this Agreement and
(C) Arch enters into an agreement with a third party with respect to an
Acquisition Proposal within 12 months of the termination of this Agreement; (ii)
this Agreement is terminated by PageNet pursuant to Section 8.3(a) or (b)
provided that, with respect to Section 8.3(b), it is terminated solely with
respect to a breach of (A) Section 6.2 or (B) Section 6.5 (but, only with
respect to Arch' obligation in accordance with such Section to duly convene and
complete the Arch Stockholders Meeting regarding the adoption of this Agreement
and the matters set forth in Section 6.5(b) of this Agreement); or (iii) this
Agreement is terminated by Arch pursuant to Section 8.4(f), then Arch and its
Subsidiaries (jointly and severally) shall pay PageNet a fee equal to $40.0
million (the "PageNet Termination Fee"), which amount shall be in addition to
any expenses to be paid pursuant to Section 6.12, payable by wire transfer of
same day funds. A PageNet Termination Fee payable pursuant to Section 8.5(b)(i),
or (ii) shall be paid no later than two days after the date of termination and a
PageNet Termination Fee payable pursuant to Section 8.5(b)(iii) shall be paid
simultaneously with (and such payment shall be a condition of) termination
pursuant to Section 8.4(f). Arch acknowledges that the agreements contained in
this Section 8.5(b) are an integral part of the transactions contemplated by
this Agreement, and that, without these agreements, PageNet would not enter into
this Agreement. Accordingly, if Arch fails to pay promptly the amount due
pursuant to this Section 8.5(b), and, in order to obtain such payment, PageNet
commences a suit which results in a judgment against Arch for the fee set forth
in this paragraph (b), Arch shall pay to PageNet its costs and expenses
(including attorneys' fees) in connection with such suit, together with interest
on the amount of the fee at the prime rate of Citibank N.A. in effect on the
date such payment was required to be made.

     (c) In the event that: (i) an Acquisition Proposal shall have been made to
PageNet or have been made directly to PageNet's stockholders or noteholders
generally or any Person shall have publicly announced an intention (whether or
not conditional) to make an Acquisition Proposal and thereafter: (A) PageNet's
stockholders do not adopt this Agreement or the other transactions contemplated
hereby at the PageNet Stockholders Meeting or PageNet's noteholders do not
satisfy the PageNet Minimum Condition with respect to the PageNet Notes, and the
bankruptcy court fails to enter the Final Confirmation Order which would
otherwise enable the transactions set forth in this Agreement to occur without
approval by the holders of PageNet Shares; (B) this Agreement is terminated by
either Arch or PageNet pursuant to the terms of this Agreement and (C) either
(x) PageNet executes and delivers an agreement with respect to an Acquisition
Proposal or (y) an Acquisition Proposal with respect to PageNet is consummated,
in either case, within 12 months of the date this Agreement is terminated; (ii)
this Agreement is terminated by Arch pursuant to Section 8.4(a) or (b) provided
that, with respect to Section 8.4(b), it is terminated solely with respect to a
breach of (A) Section 6.2 or (B) Section 6.5 (but, only with respect to
PageNet's obligation in accordance with such Section to duly convene and
complete the PageNet Stockholders Meeting (unless the Bankruptcy Case has
commenced or PageNet has stipulated to bankruptcy relief after the occurrence of
an Involuntary Insolvency Event pursuant to Section 6.19(a)(iv) hereof)
regarding the adoption of this Agreement and the approval of the matters set

                                      A-40
<PAGE>   330

forth in Section 6.5(a) of this Agreement); (iii) the Prepackaged Plan is
withdrawn without the prior written consent of Arch, or PageNet files any other
plan of reorganization or amends, modifies or adds to any material provision of
the Prepackaged Plan in each case without the prior written consent of Arch;
(iv) any other plan of reorganization filed by a person other than PageNet is
confirmed by the bankruptcy court; (v) PageNet files a motion to sell or
otherwise transfer all or a substantial portion of its assets as part of a sale
pursuant to Section 363 of the Bankruptcy Code without the prior written consent
of Arch; or (vi) this Agreement is terminated by PageNet pursuant to Section
8.3(c) or (d), then PageNet and its Subsidiaries (jointly and severally) shall
pay Arch a fee equal to $40.0 million (the "Arch Termination Fee"), which amount
shall be in addition to any expenses to be paid pursuant to Section 6.12,
payable by wire transfer of same day funds. A Arch Termination Fee payable
pursuant to Section 8.5(c)(i), (ii), (iii), (iv) or (v) shall be paid no later
than two days after the date of termination and a Arch Termination Fee payable
pursuant to Section 8.5(c)(vi) shall be paid simultaneously with (and such
payment shall be a condition of) termination pursuant to Section 8.3(c) or (d).
PageNet acknowledges that the agreements contained in this Section 8.5(c) are an
integral part of the transactions contemplated by this Agreement, and that,
without these agreements, Arch and Merger Sub would not enter into this
Agreement. Accordingly, if PageNet fails to pay promptly the amount due pursuant
to this Section 8.5(c) (and in any case in which the Bankruptcy Case has been
commenced, the Initial Merger Order approves this provision), and, in order to
obtain such payment, Arch commences a suit which results in a judgment against
PageNet for the fee set forth in this paragraph (c), PageNet shall pay to Arch
its costs and expenses (including attorneys' fees) in connection with such suit,
together with interest on the amount of the fee at the prime rate of Citibank
N.A. in effect on the date such payment was required to be made.

                                  ARTICLE IX.

                           MISCELLANEOUS AND GENERAL

     9.1.  Survival.  Article II, Article III, Article IV and this Article IX
(other than Section 9.4 (Counterparts)), and the agreements of PageNet, Arch and
Merger Sub contained in Sections 6.8 (Affiliates), 6.11 (Benefits), 6.12
(Expenses) and 6.13 (Indemnification; Directors' and Officers' Insurance) shall
survive the consummation of the Merger. This Article IX (other than Section 9.2
(Modification or Amendment), Section 9.3 (Waiver of Conditions) and Section 9.13
(Assignment)) and the agreements of PageNet, Arch and Merger Sub contained in
Section 6.12 (Expenses), Section 6.14 (Takeover Statute), Section 6.15
(Confidentiality) and Section 8.5 (Effect of Termination and Abandonment) shall
survive the termination of this Agreement. All other representations,
warranties, covenants and agreements in this Agreement shall not survive the
consummation of the Merger or the termination of this Agreement.

     9.2.  Modification or Amendment.  Subject to the provisions of the
applicable law, at any time prior to the Effective Time, the parties to this
Agreement may modify or amend this Agreement, by written agreement executed and
delivered by duly authorized officers of the respective parties.

     9.3.  Waiver of Conditions.

          (a) Any provision of this Agreement may be waived prior to the
     Effective Time if, and only if, such waiver is in writing and signed by an
     authorized representative or the party against whom the waiver is to be
     effective.

          (b) No failure or delay by any party in exercising any right, power or
     privilege under this Agreement shall operate as a waiver thereof nor shall
     any single or partial exercise thereof preclude any other or further
     exercise thereof or the exercise of any other right, power or privilege.
     Except as otherwise provided in this Agreement, the rights and remedies
     herein provided shall be cumulative and not exclusive of any rights or
     remedies provided by Law.

     9.4.  Counterparts.  This Agreement may be executed in any number of
counterparts, each such counterpart being deemed to be an original instrument,
and all such counterparts shall together constitute the same agreement.

                                      A-41
<PAGE>   331

     9.5.  Governing Law and Venue; Waiver of Jury Trial.

          (a) This Agreement shall be deemed to be made in and in all respects
     shall be interpreted, construed, and governed by, and in accordance with,
     the substantive laws of the State of Delaware, without regard to the
     conflict of law principles thereof. The parties hereby irrevocably and
     unconditionally consent to submit to the exclusive jurisdiction of the
     courts of the State of Delaware and of the United States of America located
     in Wilmington, Delaware, including the U.S. Bankruptcy Court for the
     District of Delaware (the "Delaware Courts"), for any litigation arising
     out of or relating to this Agreement or the Prepackaged Plan and the
     transactions contemplated by this Agreement (and agree not to commence any
     litigation relating thereto except in such Delaware Courts), waive any
     objection to the laying of venue of any such litigation in the Delaware
     Courts and agree not to plead or claim in any Delaware Court that such
     litigation brought therein has been brought in an inconvenient forum.

          (b) EACH PARTY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY
     ARISE UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT
     ISSUES, AND THEREFORE, EACH SUCH PARTY HEREBY IRREVOCABLY AND
     UNCONDITIONALLY WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY
     WITH RESPECT TO ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, OR
     RELATING TO, THIS AGREEMENT, OR THE TRANSACTIONS CONTEMPLATED BY THIS
     AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT: (i) NO
     REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED,
     EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF
     LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER; (ii) EACH SUCH PARTY
     UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER; (iii) EACH
     PARTY MAKES THIS WAIVER VOLUNTARILY; AND (iv) EACH SUCH PARTY HAS BEEN
     INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL
     WAIVERS AND CERTIFICATIONS IN THIS SECTION 9.5.

     9.6.  Notices.  Notices, requests, instructions or other documents to be
given under this Agreement shall be in writing and shall be deemed given: (i)
when sent if sent by facsimile, provided that receipt of the fax is promptly
confirmed by telephone; (ii) when delivered, if delivered personally to the
intended recipient; and (iii) one business day later, if sent by overnight
delivery via a national courier service, and in each case, addressed to a party
at the following address for such party:

        If to Arch or Merger Sub:

               Arch Communications Group, Inc.
               1800 West Park Drive, Suite 250
               Westborough, Massachusetts 01581
               Attention: Chief Executive Officer
               Fax: (508) 870-6076

        with a copy to:

               Hale and Dorr LLP
               60 State Street
               Boston, Massachusetts 02109
               Attention: Jay E. Bothwick
               Fax: (617) 526-5000

        and if to PageNet:

               Paging Network, Inc.
               14911 Quorum Drive
               Dallas, Texas 75240
               Attention: Chief Executive Officer
               Fax: (972) 801-8950

        and

                                      A-42
<PAGE>   332

               Paging Network, Inc.
               14911 Quorum Drive
               Dallas, Texas 75240
               Attention: Senior Vice President and General Counsel
               Fax: (972) 801-8978

        with a copy to:

               Mayer, Brown & Platt
               190 South LaSalle Street
               Chicago, Illinois 60603-3441
               Attention: John R. Schmidt
               Fax: (312) 701-7711

or to such other persons or addresses as may be designated in writing by the
party to receive such notice as provided above.

     9.7.  Entire Agreement.  This Agreement (including any exhibits and annexes
to this Agreement), Series C Consent Agreement, the Confidentiality Agreement,
the PageNet Disclosure Letter, and the Arch Disclosure Letter constitute the
entire agreement, and supersede all other prior agreements, understandings,
representations and warranties, both written and oral, among the parties with
respect to the subject matter of this Agreement. EACH PARTY TO THIS AGREEMENT
AGREES THAT, EXCEPT FOR THE REPRESENTATIONS AND WARRANTIES CONTAINED IN THIS
AGREEMENT, NEITHER ARCH AND MERGER SUB NOR PAGENET MAKES ANY REPRESENTATIONS OR
WARRANTIES, AND EACH HEREBY DISCLAIMS ANY OTHER REPRESENTATIONS OR WARRANTIES
MADE BY ITSELF OR ANY OF ITS OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, FINANCIAL
AND LEGAL ADVISORS OR OTHER REPRESENTATIVES, WITH RESPECT TO THE EXECUTION AND
DELIVERY OF THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT,
NOTWITHSTANDING THE DELIVERY OR DISCLOSURE TO THE OTHER PARTY OR THE OTHER
PARTY'S REPRESENTATIVES OF ANY DOCUMENTATION OR OTHER INFORMATION WITH RESPECT
TO ANY ONE OR MORE OF THE FOREGOING.

     9.8.  No Third Party Beneficiaries.  Except as provided in Section 6.11
(Benefits), and Section 6.13 (Indemnification; Directors' and Officers'
Insurance), this Agreement is not intended to confer upon any Person other than
the parties to this Agreement any rights or remedies under this Agreement.

     9.9.  Obligations of Arch and of PageNet.  Whenever this Agreement requires
a Subsidiary of Arch to take any action, such requirement shall be deemed to
include an undertaking on the part of Arch to cause such Subsidiary to take such
action. Whenever this Agreement requires a Subsidiary of PageNet to take any
action, such requirement shall be deemed to include an undertaking on the part
of PageNet to cause such Subsidiary to take such action and, after the Effective
Time, on the part of the Surviving Corporation to cause such Subsidiary to take
such action.

     9.10.  Severability.  The provisions of this Agreement shall be deemed
severable and the invalidity or unenforceability of any provision shall not
affect the validity or enforceability or the other provisions of this Agreement.
If any provision of this Agreement, or the application thereof to any Person or
any circumstance, is invalid or unenforceable: (a) a suitable and equitable
provision shall be substituted therefor in order to carry out, so far as may be
valid and enforceable, the intent and purpose of such invalid or unenforceable
provision; and (b) the remainder of this Agreement and the application of such
provision to other Persons or circumstances shall not be affected by such
invalidity or unenforceability, nor shall such invalidity or unenforceability
affect the validity or enforceability of such provision, or the application
thereof, in any other jurisdiction.

     9.11.  Interpretation.  Where a reference in this Agreement is made to a
section or exhibit, such reference shall be to a section of, or exhibit or annex
to this Agreement unless otherwise indicated. Whenever the words "include,"
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed by the words "without limitation".

                                      A-43
<PAGE>   333

     9.12.  Captions.  The table of contents, article, section, and paragraph
captions in this Agreement are for convenience of reference only, do not
constitute part of this Agreement and shall not be deemed to limit or otherwise
affect any of the provisions of this Agreement.

     9.13.  Assignment.  This Agreement shall not be assignable by operation of
law or otherwise, provided, that the parties agree that this Agreement may be
assumed by PageNet as a debtor-in-possession in the Bankruptcy Case and may be
assumed by Arch should Arch become a debtor in any bankruptcy case under the
Bankruptcy Code. Any assignment in contravention of the preceding sentence shall
be null and void.

                                   * * * * *

                                      A-44
<PAGE>   334

     IN WITNESS WHEREOF, this Agreement has been duly executed and delivered by
the duly authorized officers of the parties to this Agreement as of the date
first written above.

                                            PAGING NETWORK, INC.

                                            By: /s/ JOHN P. FRAZEE, JR.
                                              ----------------------------------
                                                Name: John P. Frazee, Jr.
                                              Title: Chairman of the Board and
                                              Chief Executive Officer

                                            ARCH COMMUNICATIONS GROUP, INC.

                                            By: /s/ C.E. BAKER, JR.
                                              ----------------------------------
                                                Name: C.E. Baker, Jr.
                                                Title: Chairman of the Board and
                                                Chief Executive Officer

                                            ST. LOUIS ACQUISITION CORP.

                                            By: /s/ C.E. BAKER, JR.
                                              ----------------------------------
                                                Name: C.E. Baker, Jr.
                                                Title: Chief Executive Officer

                                      A-45
<PAGE>   335

                                                                         ANNEX B

                          [LETTERHEAD OF BEAR STEARNS]

November 7, 1999

The Board of Directors
Arch Communications Group, Inc.
1800 West Park Drive, Suite 250
Westborough, Massachusetts 01581

Gentlemen:

     We understand that Arch Communications Group, Inc. ("Arch"), St. Louis
Acquisition Corp., a wholly owned subsidiary of Arch ("Merger Sub") and Paging
Network, Inc. ("PageNet") have entered into an Agreement and Plan of Merger (the
"Agreement") dated November 7, 1999, pursuant to which Merger Sub shall merge
with and into PageNet (the "Merger") and each PageNet Share (other than the
Excluded PageNet Shares) shall be converted into and become exchangeable for
0.124677 of a share (the "Exchange Ratio") of Arch Common Stock, subject to
adjustment as set forth in the Agreement. You have provided us with a copy of
the Agreement; all capitalized terms in this letter have the meanings assigned
to them in the Agreement, unless otherwise defined in this letter.

     You have asked us to render our opinion as to whether the Exchange Ratio is
fair, from a financial point of view, to the stockholders of Arch as of the date
of this letter.

     In the course of performing our review and analyses for rendering this
opinion, we have:

     - reviewed the Agreement;

     - reviewed Arch's and PageNet's Annual Reports to Stockholders and Annual
       Reports on Form 10-K for the years ended December 31, 1996 through 1998,
       and their Quarterly Reports on Form 10-Q for the periods ended March 31
       and June 30, 1999;

     - reviewed all Reports on Form 8-K of Arch and PageNet for the period
       commencing January 1, 1996 through the date hereof;

     - reviewed certain operating and financial information, including
       projections and synergy estimates, provided to us by Arch's and PageNet's
       management relating to the business and prospects of Arch and PageNet,
       respectively;

     - met with certain members of Arch's and PageNet's senior management to
       discuss the business, operations, historical and projected financial
       results and prospects of Arch and PageNet, respectively, as well as the
       potential synergies for the combined company resulting from the Merger
       (the "Combined Company");

     - reviewed the historical prices, trading multiples and trading volumes of
       the Arch Common Stock and the PageNet Shares;

     - reviewed publicly available financial data, stock market performance data
       and trading multiples of companies which we deemed generally comparable
       to Arch and PageNet, as appropriate;

                                       B-1
<PAGE>   336
Arch Communications Group, Inc.
November 7, 1999
Page  2

     - reviewed the terms of recent merger and acquisition transactions
       involving companies which we deemed generally comparable to Arch and
       PageNet;

     - performed discounted cash flow analyses based on the projections for Arch
       and the Combined Company furnished to us by Arch;

     - reviewed the pro forma financial results, financial condition and
       capitalization of the Combined Company; and

     - conducted such other studies, analyses, inquiries and investigations as
       we deemed appropriate.

     We have relied upon and assumed, with your permission, without independent
verification, the accuracy and completeness of the financial and other
information, including without limitation the projections and synergy estimates,
provided to us by Arch and PageNet. With respect to Arch's and PageNet's
projected financial results and the potential synergies that could be achieved
upon consummation of the Merger, we have assumed that they have been reasonably
prepared on bases reflecting the best currently available estimates and
judgments of the senior managements of Arch and PageNet as to the expected
future performance of Arch, PageNet and the Combined Company. We have not
assumed any responsibility for the independent verification of any such
information or of the projections and synergy estimates provided to us, and we
have further relied upon the assurances of the senior managements of Arch and
PageNet that they are unaware of any facts that would make the information,
projections and synergy estimates provided to us incomplete or misleading.

     In arriving at our opinion, we have not performed or obtained any
independent appraisal of the assets or liabilities of Arch and PageNet, nor have
we been furnished with any such appraisals. We have assumed that the Merger will
qualify as a tax-free "reorganization" within the meaning of Section 368(a) of
the Internal Revenue Code. We have assumed that the Merger will be consummated
without any regulatory limitations, restrictions, conditions, amendments or
modifications that collectively would have a material effect on Arch, PageNet or
the Combined Company. We have assumed that the other transactions contemplated
in connection with the Merger are in fact consummated as described in the
Agreement. Our opinion is necessarily based on economic, market and other
conditions, and the information made available to us, as of the date hereof.

     We do not express any opinion as to the price or range of prices at which
the shares of Arch Common Stock and the PageNet Shares may trade subsequent to
the announcement of the Merger or as to the price or range of prices at which
the shares of common stock of the Combined Company may trade subsequent to the
consummation of the Merger.

     We have acted as a financial advisor to Arch in connection with the Merger
and will receive a customary fee for such services. Bear Stearns has been
previously engaged by Arch to provide certain investment banking and financial
advisory services in connection with Arch's acquisition of MobileMedia
Communications, Inc. and Arch's issuance of 12 3/4% Senior Notes, 13 3/4% Senior
Notes and Series C Preferred Stock, for which transactions Bear Stearns received
customary fees. In the ordinary course of business, Bear Stearns may actively
trade the equity and debt securities of Arch and/or PageNet for our own account
and for the account of our customers and, accordingly, may at any time hold a
long or short position in such securities.

     It is understood that this letter is intended for the benefit and use of
the Board of Directors of Arch and does not constitute a recommendation to the
Board of Directors of Arch or any holders of Arch Common Stock as to how to vote
in connection with the Merger. This letter is not intended for the benefit or
use of the holders of the Arch Notes. This opinion does not address Arch's
underlying business decision to pursue the Merger. This letter is not to be used
for any other purpose, or reproduced, disseminated, quoted to or referred to at
any time, in whole or in part, without our prior written consent; provided,

                                       B-2
<PAGE>   337
Arch Communications Group, Inc.
November 7, 1999
Page  3

however, that this letter may be included in its entirety in any joint proxy
statement/prospectus to be distributed to the holders of Arch Common Stock in
connection with the Merger.

     Based on and subject to the foregoing, it is our opinion that, as of the
date hereof, the Exchange Ratio is fair, from a financial point of view, to the
stockholders of Arch.

                                          Very truly yours,

                                          BEAR, STEARNS & CO. INC.

                                          By:
                                            ------------------------------------
                                                  Senior Managing Director

                                       B-3
<PAGE>   338

                                                                         ANNEX C

                      [ANNEX C TO BE FILED BY AMENDMENT.]

                                       C-1
<PAGE>   339

                                                                         ANNEX D

                      [ANNEX D TO BE FILED BY AMENDMENT.]

                                       D-1
<PAGE>   340

                                                                         ANNEX E

                      [ANNEX E TO BE FILED BY AMENDMENT.]

                                       E-1
<PAGE>   341

        The information in this prospectus is not complete and may be changed.
        We may not sell these securities until the registration statement filed
        with the Securities and Exchange Commission is effective. This
        prospectus is not an offer to sell these securities and it is not
        soliciting an offer to buy these securities in any state where the offer
        or sale is not permitted.

                                                                         ANNEX F

                 SUBJECT TO COMPLETION, DATED JANUARY 27, 2000

PROSPECTUS

                                   VAST LOGO

                               16,100,000 SHARES

                              VAST SOLUTIONS, INC.
                              CLASS B COMMON STOCK
                           -------------------------

     Of the 16,100,000 shares of our Class B common stock covered by this
prospectus, 13,780,000 are being offered by Paging Network, Inc. in exchange for
its outstanding senior subordinated indebtedness and 2,320,000 are being
distributed by PageNet to its stockholders. PageNet currently owns all of our
outstanding Class A and Class B common stock.

     The PageNet exchange offer and the distribution of our common stock to
PageNet stockholders are part of a merger transaction between PageNet and Arch
Communications Group, Inc. Both the exchange offer and the distribution will be
completed immediately prior to the merger. After the merger, Arch will
indirectly own all of our Class A common stock, which will constitute 19.5% of
our outstanding common stock.

     We have the option to redeem shares of our Class B common stock, in whole
or in part, at any time following the sale by us of additional shares of Class A
common stock, or any shares of our capital stock convertible into shares of our
Class A common stock, other than sales pursuant to an employee benefit plan. See
"Description of Vast Capital Stock -- Common Stock -- Redemption." All shares of
Class B common stock will automatically convert into Class A common stock two
years after completion of the Arch merger or, if earlier, one year after we
complete an underwritten public offering of common stock with net proceeds of
more than $25 million.

     Neither our Class A nor our Class B common stock is listed on any
securities exchange. We do not intend to apply for listing of our Class B common
stock on any securities exchange or quotation system.

     AN INVESTMENT IN OUR CLASS B COMMON STOCK INVOLVES RISKS WHICH ARE
DESCRIBED IN THE "RISK FACTORS" SECTION BEGINNING ON PAGE F-5.

     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                           -------------------------

        The date of this prospectus is                          , 2000.
<PAGE>   342

                               TABLE OF CONTENTS

<TABLE>
<S>                                                             <C>
Prospectus Summary..........................................       3
Risk Factors................................................       5
Forward-Looking Statements..................................      14
Dividend Policy.............................................      15
Use of Proceeds.............................................      15
Selected Financial Data.....................................      16
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................      17
Business....................................................      21
Management..................................................      27
Arrangements Between Vast and PageNet.......................      31
Principal Stockholders......................................      31
Security Ownership of Management............................      32
Description of Vast Capital Stock...........................      33
Shares Eligible for Future Sale.............................      39
Legal Matters...............................................      40
Experts.....................................................      40
Where You Can Find More Information.........................      40
Index to Financial Statements...............................    FF-1
</TABLE>

                                        2
<PAGE>   343

                               PROSPECTUS SUMMARY

     You should read the following summary together with the more detailed
information regarding us, our Class B common stock being offered by this
prospectus and our financial statements and notes relating to those financial
statements appearing elsewhere in this prospectus. References in this prospectus
to "Vast" mean Vast Solutions, Inc. References in this prospectus to "PageNet"
mean Paging Network, Inc. and its consolidated subsidiaries other than Vast.
References in this prospectus to "Arch" mean Arch Communications Group, Inc. and
its consolidated subsidiaries.

     Information contained in this prospectus regarding our business and
operations, including information discussed in "Risk Factors," "Management's
Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources," "Business -- Wireless Network,
Content and Equipment Providers" and "Business -- Intellectual Property Rights,"
assumes the completion of the merger between PageNet and Arch and the completion
of certain related transactions. The related transactions include the transfer,
contribution or assignment of certain assets from PageNet to us, including
certain components of our Gateway, and PageNet's forgiveness of various
intercompany loans. The completion of the Arch merger and the related
transactions require the approval of PageNet's noteholders, stockholders and
bank lenders, Arch's stockholders and certain additional third parties.
Additional information regarding the Arch merger can be found in the joint
proxy/statement prospectus to which this prospectus is attached as Annex F.
Additional information regarding the nature of the related transactions can be
found in "Selected Financial Data" and "Arrangements Between Vast and PageNet."

                                  THE COMPANY

     We offer integrated wireless solutions that connect businesses to their
employees, customers and remote assets, such as vending machines, automobiles
and storage tanks. We can provide these solutions on a full-service basis,
allowing our customers to completely outsource complex wireless solutions. Using
our expandable software platform (our Gateway), provisioning and service and
support operations, we are able to provide our customers with a comprehensive
end-to-end wireless solution that seamlessly connects their mobile users with
the Internet or corporate data network using wireless devices. We believe our
principal assets are our wireless software and software development
capabilities, our Gateway, our enterprise application provider partners and our
ability to manage our customers' wireless data operations.

     Vast is a development stage company and, since its inception, has been
engaged primarily in product research and development and developing markets for
its products and services. We have incurred significant operating losses as a
result of these start-up activities. We began offering some of our integrated
wireless solutions products and services in late 1999, and believe that revenues
from sales of these products and services will grow rapidly.

     Our historical revenues consist primarily of sales of software developed by
Silverlake Communications, Inc., which PageNet acquired in December 1998.
Silverlake's product line is a suite of software products focusing on wireless
communications, including one-way messaging and two-way advanced communications.
Although we intend to maintain both sales and service of this product line, it
is not a material part of our future growth strategy.

     Vast was incorporated in the State of Delaware in 1999. The operations of
Vast include the activities of PageNet's wireless solutions division since its
formation in September 1998, as well as the operations of Silverlake. Our
principal executive offices are located at 14131 Midway Road, Suite 500,
Addison, Texas 75001, telephone number: (972) 801-8800. Our website, which is
not part of this prospectus, is located at www.vast.com.

                                        3
<PAGE>   344

                               THE EXCHANGE OFFER

     PageNet is offering to exchange a pro rata portion of 616,830,757 shares of
PageNet common stock and a pro rata portion of 13,780,000 shares of our Class B
common stock for each of PageNet's:

     - 8.875% senior subordinated notes due 2006;

     - 10.125% senior subordinated notes due 2007; and

     - 10% senior subordinated notes due 2008.

     The pro rata portion will be computed immediately prior to the time when
the Arch merger occurs by dividing

     - the principal amount, together with all accrued interest, of each PageNet
       senior subordinated note; by

     - the principal amount, together with all accrued interest, of all PageNet
       senior subordinated notes outstanding at the time of the PageNet
       exchange.

                            THE SPINOFF DISTRIBUTION

     The merger agreement between PageNet and Arch provides that PageNet will
distribute to its stockholders interests in Vast representing up to 11.6% of our
total equity. In accordance with the merger agreement, the PageNet board of
directors will declare a dividend, payable to the persons who are PageNet
stockholders immediately prior to the acceptance of senior subordinated notes in
the exchange offer, consisting of 2,320,000 shares of our Class B common stock.
The dividend will not be paid unless all of the conditions to the Arch merger
have been satisfied. Because the dividend will be declared prior to acceptance
of PageNet senior subordinated notes in the exchange offer, noteholders who
become stockholders of PageNet in the exchange offer will not be entitled to
receive any portion of this distribution.

                       PREPACKAGED PLAN OF REORGANIZATION

     PageNet noteholders will be required, as a condition to tendering their
notes in the exchange offer, to give their consent to a prepackaged plan of
reorganization of PageNet. If PageNet files a prepackaged reorganization plan
under Chapter 11 of the United States Bankruptcy Code and the prepackaged plan
is confirmed by the bankruptcy court and consummated, then 100% of the senior
subordinated notes will be converted into shares of Arch common stock and our
Class B common stock. The number of shares of our Class B common stock which the
holders of PageNet senior subordinated notes will receive under the prepackaged
plan and the exchange offer are the same. PageNet stockholders will also receive
the same number of shares of our Class B common stock under the prepackaged plan
as they would receive pursuant to the spinoff distribution.

                                        4
<PAGE>   345

                                  RISK FACTORS

     As our stockholder, you may be subject to risks inherent in our business.
The performance of your shares will reflect the performance of our business
related to, among other things, our competition, general economic and market
conditions and industry conditions. The price of our common stock may decline
and the value of your investment could decrease. You should carefully consider
the following factors as well as other information contained in this prospectus
before deciding whether to participate in the PageNet exchange offer or to vote
in favor of the PageNet plan of reorganization.

THE ARCH MERGER MAY NOT TAKE PLACE.

     The Arch merger will not take place unless many conditions are satisfied or
waived. These conditions include stockholder and noteholder approvals,
governmental approvals and the availability of senior credit facilities.
Moreover, PageNet may be required in some circumstances to file a prepackaged
plan under Chapter 11 of the United States Bankruptcy Code to implement the
merger. There can be no assurance that the proposed plan of reorganization would
be approved by the bankruptcy court if filed. If the Arch merger does not take
place, the contemplated exchange and distribution of shares of our Class B
common stock will not occur. If the Arch merger does not take place, it is
unlikely that we would be able to arrange for independent sources of debt or
equity financing. In addition, if the Arch merger does not take place, it is
unlikely that PageNet will be able to transfer certain assets to us, including
PageNet's rights under certain software licenses on which our business is
substantially dependent, and we may be unable to continue our current
operations.

PAGENET MAY BE REQUIRED TO REDUCE ITS OPERATIONS, INCLUDING THOSE OF VAST,
AND/OR SEEK IMMEDIATE REPAYMENT OF ITS FUNDING OF VAST AS PART OF A
RESTRUCTURING OF ITS OBLIGATIONS UNDER THE UNITED STATES BANKRUPTCY CODE.

     If PageNet is unable to improve its domestic earnings before interest,
taxes, depreciation and amortization, or EBITDA, it may not have sufficient cash
or borrowing capacity to meet its obligations through the end of the first
quarter of 2000. While PageNet is currently exploring various alternatives to
ensure that it has sufficient liquidity through the consummation of the Arch
merger, there can be no assurance that such efforts will be timely or
successful. There also can be no assurance that the merger will be completed or
will not be substantially delayed. If PageNet's strategies to obtain additional
liquidity are not timely or successful, or the merger is not completed or is
delayed, PageNet may be required to reduce the level of its operations,
including the operations of Vast, and/or commence a proceeding under Chapter 11
of the United States Bankruptcy Code to restructure its obligations. PageNet may
also seek our immediate repayment of a $30.0 million non-interest bearing note
payable, and other amounts due, to PageNet. A bankruptcy filing by PageNet would
likely have a material impact on our results of operations and financial
position.

WE MAY NOT BE ABLE TO OBTAIN ADEQUATE FINANCING TO CONTINUE OUR CURRENT
OPERATIONS.

     To date our operations have been funded primarily through investments by
PageNet, which we do not expect to continue following the merger of PageNet and
Arch. We may be required to reduce our current level of operations unless we are
able to obtain capital through additional debt or equity financings. We cannot
assure you that debt or equity financings will be available as required. Even if
financing is available, it may not be on terms that are favorable to us or
sufficient for our needs. If we are unable to obtain sufficient financing, we
may be unable to continue our current operations.

MANY OF OUR WIRELESS SOLUTIONS PRODUCTS AND SERVICES ARE IN DEVELOPMENT AND ARE
NOT NOW AVAILABLE FOR COMMERCIAL USE.

     Several of our wireless solutions products and services are in "beta"
testing with various customers. A limited number of our customers are currently
using our wireless solutions products and services on a commercial basis. If one
or more of our customers decide not to place our products and services into

                                        5
<PAGE>   346

service, our revenues will not grow as anticipated. Further, if we are unable to
achieve market acceptance of our wireless solutions products and services, our
business would be materially adversely affected.

OUR LIMITED OPERATING HISTORY MAKES FINANCIAL FORECASTING DIFFICULT AND, IN
ASSESSING OUR PROSPECTS, YOU SHOULD CONSIDER OUR EARLY STAGE OF DEVELOPMENT AND
PRESENCE IN A NEW AND RAPIDLY EVOLVING INDUSTRY.

     Since our inception, we have been engaged primarily in the product
development and initial marketing activities of our wireless solutions business.
Therefore, it is difficult to forecast our future operating results. Our
operations began in September 1998 when PageNet established a separate wireless
solutions business unit. We have generated limited revenues to date.
Accordingly, you should assess our prospects in light of the risks and
difficulties frequently encountered by companies in the early stage of
development, particularly companies in new and rapidly evolving industries.

WE HAVE HISTORICALLY INCURRED LOSSES AND WE MAY NOT ACHIEVE PROFITABILITY.

     We have not operated profitably to date. We incurred net losses during our
development stage of $4,163,733 for the four months we operated in 1998 and
$22,489,299 for the nine-month period ended September 30, 1999. At September 30,
1999, we had accumulated losses since inception of $26,653,032. We intend to
continue to make significant investments in our research and development,
marketing, services and sales operations. We anticipate that these expenses
could significantly precede any revenues generated by the increased spending. As
a result, we are likely to continue to experience losses and negative cash flow
from operations in future periods. If we do become profitable, we may not
sustain or increase our profitability. See "Management's Discussion and Analysis
of Financial Condition and Results of Operations."

WE HAVE NO INDEPENDENT OPERATING HISTORY.

     We have no independent operating history. Most of our current business
operations include various operations of PageNet which were conducted as a
separate business unit within PageNet. Following the Arch merger, we will be
required to supplement our administrative and other resources to provide
services necessary to operate as an independent company. Although the costs of
the services provided to us by PageNet are reflected in our historical financial
results and we believe the amounts allocated to us are a reasonable allocation
of the costs PageNet incurred on our behalf, financial information included in
this prospectus may not necessarily reflect what our results of operations would
have been had we been a separate, stand-alone entity during the periods
presented.

WE HAVE A LENGTHY SALES CYCLE.

     We have generally experienced a lengthy sales cycle, averaging
approximately four to nine months. The lengthy sales cycle is one of the factors
that may cause our revenues and operating results to vary significantly from
quarter to quarter. Because of the unique characteristics of our products and
services, our prospective customers' decisions to license our products and/or
purchase our services often require significant investment and executive level
decision making. We believe that many companies currently are not aware of the
benefits of our wireless solutions products and services. For this reason, we
must provide a significant level of information to prospective customers about
the use and benefits of our products and services. This lengthy process can
cause potential customers to take many months to make these decisions. As a
result, sales cycles for customer orders vary substantially from customer to
customer. Excessive delay in completing sales could materially adversely affect
our business, financial condition or results of operations.

     The length of the sales cycle for customer orders depends on a number of
other factors over which we have little or no control, including:

     - a customer's budgetary constraints;

     - the timing of a customer's budget cycles;

                                        6
<PAGE>   347

     - concerns by customers about the introduction of new products or services
       by us or our competitors; and

     - potential downturns in general economic conditions, including reductions
       in demand for wireless data services.

THE LOSS OF A MAJOR CUSTOMER COULD ADVERSELY AFFECT OUR REVENUES AND OUR
OPERATING RESULTS.

     No single customer accounted for more than 10% of our revenues in 1999.
However, our wireless solutions business is in the development stage, and we
have a limited number of customer relationships established. We expect to have a
high degree of customer concentration in our wireless solutions business,
although not necessarily involving the same customers from period to period. To
the extent that any significant customer reduces the scope of its relationship
with us, or terminates its relationship with us, our revenues for the relevant
fiscal period could substantially decline. As a result, the loss of any major
customer could materially harm our business.

OUR INABILITY TO SUCCESSFULLY MANAGE OUR INTENDED GROWTH OR OUR INCREASINGLY
COMPLEX THIRD-PARTY RELATIONSHIPS COULD ADVERSELY AFFECT US.

     If we are not able to manage our intended growth successfully, we will not
grow as planned and our business could be adversely affected. Our existing
management, operational, financial and human resources, as well as our
management information systems and controls, may be inadequate to support our
future operations. In addition, as the complexity of our product technology and
our third-party relationships have increased, the management of those
relationships and the negotiation of contractual terms sufficient to protect our
rights and limit our potential liabilities has become more complicated, and we
expect this trend to continue in the future. As a result, our inability to
successfully manage these relationships or negotiate sufficient contractual
terms could have a material adverse effect on us.

COMPETITIVE PRESSURES MAY HAVE A MATERIAL ADVERSE EFFECT ON US.

     Because our industry is new and evolving and characterized by rapid
technological change, it is difficult for us to predict whether, when and by
whom new competing technologies or new competitors may be introduced into our
markets. Currently, we believe our competition will come from several different
market segments, including wireless data service providers, wireless
communications software companies, wireless systems integrators, wireless device
manufacturers and wireless network carriers. Many of our existing and potential
competitors have substantially greater financial, technical, marketing and
distribution resources than we do. Additionally, many of these companies have
greater name recognition and more established relationships with our target
customers. Furthermore, these competitors may be able to adopt more aggressive
pricing policies and offer customers more attractive terms than we can. Any one
of these factors could have a material adverse effect on our business, financial
condition or results of operations. See "Business -- Competition."

WE MAY NOT BE ABLE TO GROW OUR BUSINESS AS PLANNED IF WE DO NOT MAINTAIN
SUCCESSFUL RELATIONSHIPS WITH ENTERPRISE APPLICATION PROVIDERS AND CONTINUE TO
DEVELOP NEW RELATIONSHIPS WITH OTHER PROVIDERS.

     Our ability to achieve revenue growth in the future will depend in part on
our success in maintaining successful relationships with enterprise application
providers and in developing new relationships with additional providers. We use
these relationships to jointly market and sell our products and services. Rapid
technological changes may result in certain providers no longer offering the
products or services desired by our customers, and we may be unable to attract
additional providers with the types of products and/or services that our
customers require. We do not have long-term or exclusive agreements with
enterprise application providers, and the loss of these relationships could
materially adversely affect our business, financial condition or results of
operations.

                                        7
<PAGE>   348

WE DEPEND UPON WIRELESS NETWORKS OWNED AND CONTROLLED BY OTHERS. IF WE DO NOT
HAVE CONTINUED ACCESS TO SUFFICIENT CAPACITY ON RELIABLE NETWORKS, WE MAY BE
UNABLE TO DELIVER SERVICES AND OUR SALES COULD DECREASE.

     Our ability to grow and achieve profitability partly depends on our ability
to buy sufficient capacity on the networks of the wireless carriers, such as
PageNet, BellSouth, MCI Worldcom and others, and on the reliability and security
of their systems. All of our services are delivered using airtime purchased from
third parties. We depend on these companies to provide uninterrupted and "bug
free" service. We would not be able to satisfy our customers' needs if our
wireless carriers failed to provide the required capacity or needed level of
service. In addition, our expenses would increase and our profitability could be
materially adversely affected if wireless carriers were to increase the prices
of their services. Some of these wireless carriers are, or could become, our
competitors.

THE RESOURCES OF PAGENET WILL NOT BE AVAILABLE TO US AFTER THE MERGER.

     Since our inception, we have operated as a division of PageNet. Following
the Arch merger, we will not be able to rely on PageNet or Arch for financial
support or benefit from our relationships with PageNet to receive favorable
terms for the purchase or sale of various goods and services. In addition,
except as may be provided in agreements we expect to enter into with PageNet
prior to the Arch merger, we will be responsible after the merger for obtaining
our own sources of financing and for our own corporate administrative services
such as tax, treasury, risk management and insurance, accounting, payroll,
legal, information systems and human resources. We anticipate that these
agreements will allow for a transition period of 12 to 18 months, during which
PageNet will continue to provide many, if not all, of these services. Following
this transition period, we will need to outsource these functions to third
parties or hire additional staff to perform them internally.

AN INTERRUPTION IN THE SUPPLY OF PRODUCTS AND SERVICES THAT WE OBTAIN FROM THIRD
PARTIES COULD CAUSE A DECLINE IN SALES OF OUR SERVICES.

     In designing, developing and supporting our wireless data products and
services, we rely on wireless carriers, wireless handheld device manufacturers,
content providers and computer hardware and software providers. These suppliers
may experience difficulty in supplying us products or services sufficient to
meet our needs, or they may terminate or fail to renew contracts for supplying
us these products or services on terms we find acceptable. Any significant
interruption in the supply of any of these products or services could cause a
decline in sales of our products and services unless and until we are able to
replace the functionality provided by these products and services. We also
depend on third parties to deliver and support reliable products, enhance their
current products, develop new products on a timely and cost-effective basis and
respond to emerging industry standards and other technological changes. In
addition, we will rely on the ability of our content providers to provide us
with uninterrupted access to the news and financial information we expect to
provide to our customers. The failure of third parties to meet these criteria,
or their refusal or failure to deliver the information for whatever reason,
could materially harm our business.

A FAILURE IN OUR GATEWAY FACILITY WOULD ADVERSELY AFFECT OUR OPERATING RESULTS
AND OUR FINANCIAL CONDITION.

     Our operations are dependent upon our ability to prevent interruptions to
our Gateway services due to fire, power loss, natural disaster or a similar
event. A substantial portion of the computer equipment that is essential to the
operation of our Gateway facility is located at PageNet's Technical Operations
Center in Richardson, Texas. We believe our Gateway facility is supported by
sufficient available back-up computing and electric power sources on site to
maintain the provision of Gateway services without interruption. Although we
intend to establish a second Gateway facility at a remote location, we currently
do not have the financial resources to create or operate a second facility. We
would be materially adversely affected by substantial damage to our current
Gateway facility or other catastrophic failure that causes significant
interruption in our operations. Our property and business interruption insurance
may not be adequate to compensate us for all losses that may occur.
                                        8
<PAGE>   349

NEW LAWS AND REGULATIONS THAT IMPACT OUR INDUSTRY COULD INCREASE OUR COSTS OR
REDUCE OUR OPPORTUNITIES TO EARN REVENUE.

     We are not currently subject to direct regulation by the Federal
Communications Commission or any other governmental agency, other than
regulations applicable to businesses in general. However, in the future, we may
become subject to regulation by the FCC or another regulatory agency. In
addition, the wireless carriers who supply us airtime are subject to regulation
by the FCC and regulations that affect them could increase our costs or reduce
our ability to continue selling and supporting our services.

OUR MARKETS ARE CHARACTERIZED BY RAPID TECHNOLOGICAL CHANGE WHICH MAY CAUSE US
TO INCUR SIGNIFICANT DEVELOPMENT COSTS.

     The markets for our products and services are characterized by rapid
technological change, frequent new product and service introductions and
enhancements, uncertain product life cycles and changing customer demands. The
introduction of services embodying new technologies and the emergence of new
industry standards could render our existing products and services obsolete or
unmarketable and cause us to incur significant development costs to create new
or modify our existing products and services to utilize new technologies or
industry standards.

OUR FUTURE BUSINESS PROSPECTS DEPEND IN PART ON OUR ABILITY TO MAINTAIN AND
IMPROVE OUR CURRENT WIRELESS DATA SERVICES AND DEVELOP NEW SERVICES.

     We believe that our future business prospects depend in large part on our
ability to maintain and improve our current services and to develop new services
on a timely basis. Our services will have to achieve market acceptance, maintain
technological competitiveness and meet an expanding range of customer
requirements. As a result of the complexities inherent in our services, major
new wireless data services and service enhancements require long development and
testing periods. We may not be successful in developing and marketing, on a
timely and cost-effective basis, service enhancements or new services that
respond to technological change, evolving industry standards or customer
requirements. We may also experience difficulties that could delay or prevent
the successful development, introduction or marketing of service enhancements,
and our new services and service enhancements may not achieve market acceptance.
If we cannot effectively maintain, improve and develop services, we may not be
able to recover our fixed costs or otherwise become profitable. Significant
delays in the general availability of our services or significant problems in
the implementation of new services could have a material effect on our business,
financial condition or results of operations.

SLOWER THAN ANTICIPATED GROWTH IN DEMAND FOR WIRELESS ENTERPRISE SOLUTIONS OF
THE TYPE WE OFFER COULD MATERIALLY ADVERSELY AFFECT OUR GROWTH PROSPECTS.

     If the demand for wireless enterprise solutions of the type we offer does
not continue to grow as anticipated within our targeted markets, our ability to
grow our business as planned could be materially adversely affected. We expect
these solutions to account for the majority of our revenues for the foreseeable
future.

WE MAY NOT BE ABLE TO PROTECT OUR PROPRIETARY RIGHTS ADEQUATELY, WHICH COULD
ALLOW THIRD PARTIES TO COPY OR OTHERWISE OBTAIN AND USE OUR TECHNOLOGY WITHOUT
AUTHORIZATION.

     We regard our software products as proprietary. In an effort to protect our
proprietary rights, we rely primarily on a combination of copyright, trademark
and trade secret laws, as well as licensing and other agreements with
consultants, suppliers, strategic partners and customers, and employee and
third-party non-disclosure agreements. These laws and agreements provide only
limited protection of our proprietary rights. In addition, we have not signed
agreements containing these types of protective provisions in every case, and
the contractual provisions that are in place and the protection they provide
vary and may not provide us with adequate protection in all circumstances.
Although PageNet has agreed to transfer to us a provisional patent application
it holds for an invention embodied in our Gateway, we currently have no

                                        9
<PAGE>   350

patents or registered copyrights. In addition, we do not have any federal
trademark registrations in the name "Vast" and we may not be able to obtain such
registration due to conflicting marks or otherwise. Because our means of
protecting our proprietary rights may not be adequate, it may be possible for a
third party to copy or otherwise obtain and use our technology without
authorization. A third party could also develop similar technology
independently. Unauthorized copying, use or reverse engineering of our products
could materially adversely affect our business, results of operations or
financial condition.

     We license technology that is embedded in our products from others. If one
or more of these licenses terminates or cannot be renewed on satisfactory terms,
we would have to modify the affected products to use alternative technology or
eliminate the affected product function, either of which could have a material
adverse effect on us.

INFRINGEMENT CLAIMS COULD ADVERSELY AFFECT US.

     A third party could claim that our technology infringes its proprietary
rights. As the number of software products in our target markets increases and
the functionality of these products overlap, we believe that wireless software
developers may face infringement claims.

     Infringement claims, even if without merit, can be time consuming and
expensive to defend. A third party asserting infringement claims against us or
our customers with respect to our current or future products may require us to
enter into costly royalty arrangements or litigation, or otherwise materially
adversely affect us. See "Business -- Intellectual Property Rights."

OUR BUSINESS MAY SUFFER IF WE HAVE DISPUTES OVER OUR RIGHT TO RESELL OR REUSE
INTELLECTUAL PROPERTY DEVELOPED FOR SPECIFIC CUSTOMERS.

     Part of our business involves the development of software applications for
discrete customer engagements. Ownership of customer-specific software is often
retained by the customer, although we typically retain the right to reuse some
of the applications, processes and other intellectual property developed in
connection with customer engagements. Issues relating to the rights to
intellectual property can be complicated, and we cannot give any assurance that
disputes will not arise that affect our ability to resell or reuse such
applications, processes and other intellectual property. Such disputes could
damage our relationships with our customers, divert our management's attention
and have a material adverse effect on our business, financial condition or
results of operations.

WE DEPEND ON KEY PERSONNEL AND WILL NEED TO RECRUIT ADDITIONAL SKILLED
PERSONNEL, FOR WHICH COMPETITION IS INTENSE, TO CONDUCT AND GROW OUR BUSINESS
EFFECTIVELY.

     Our success depends in large part on our ability to retain our key
personnel, particularly members of our engineering staff. The loss of the
services of a large number of these individuals could have a material adverse
effect on our business, financial condition or results of operations. Our future
success also depends upon our ability to attract, train, assimilate and retain
additional qualified personnel. Competition for persons with skills in the
software industry is intense, particularly for those with relevant technical
experience. We cannot assure you that we will be able to retain our key
employees or that we can attract, train, assimilate or retain other highly
qualified personnel in the future.

WE MAY PURSUE ACQUISITIONS THAT BY THEIR NATURE PRESENT RISKS AND THAT MAY NOT
BE SUCCESSFUL.

     In the future we may pursue acquisitions to diversify our product offerings
and customer base or for other strategic purposes. We have made only one prior
acquisition and we cannot assure you that any future acquisitions will be
successful. The following are some of the risks associated with acquisitions
that could have a material adverse effect on our business, financial condition
or results of operations:

     - We cannot ensure that any acquired businesses will achieve anticipated
       revenues, earnings or cash flow.

                                       10
<PAGE>   351

     - We may be unable to integrate acquired businesses successfully and
       realize anticipated economic, operational and other benefits in a timely
       manner, particularly if we acquire a business in a market in which we
       have limited or no current expertise, or with a corporate culture
       different from our own. If we are unable to integrate acquired businesses
       successfully, we could incur substantial costs and delays or experience
       other operational, technical or financial problems.

     - Acquisitions could disrupt our ongoing business, distract management,
       divert resources and make it difficult to maintain our current business
       standards, controls and procedures.

     - We may finance future acquisitions by issuing common stock for some or
       all of the purchase price. This could dilute the ownership interests of
       our stockholders. We may also incur additional debt or be required to
       recognize amortization expense related to goodwill and other intangible
       assets purchased in future acquisitions.

     - We would be competing with other firms, many of which have greater
       financial and other resources, to acquire attractive companies. We
       believe this competition will increase, making it more difficult to
       acquire suitable companies on acceptable terms.

OUR PRODUCTS COULD HAVE DEFECTS FOR WHICH WE ARE POTENTIALLY LIABLE AND WHICH
COULD RESULT IN LOSS OF REVENUE, INCREASED COSTS OR LOSS OF OUR CREDIBILITY OR
DELAY IN ACCEPTANCE OF OUR PRODUCTS IN THE MARKET.

     Our products, including components supplied by others, may contain errors
or defects, especially when first introduced or when new versions are released.
Errors in new products or releases could be found after commencement of
commercial shipments, and this could result in additional development costs,
diversion of technical and other resources from our other development efforts,
or the loss of credibility with current or future customers. This could result
in a loss of revenue or delay in market acceptance of our products, which could
have a material adverse effect upon our business, financial condition or results
of operations.

     Our license agreements with our customers typically contain provisions
designed to limit our exposure to potential product liability and some contract
claims. However, not all of these agreements contain these types of provisions
and, where present, these provisions vary as to their terms and may not be
effective under the laws of some jurisdictions. A product liability, warranty,
or other claim brought against us could have a material adverse effect on our
business, financial condition or results of operations.

YEAR 2000 ISSUES MAY ADVERSELY AFFECT OUR BUSINESS.

     In the course of our business, we test and evaluate our software products
for Year 2000 compliance and, to date, we have not experienced any Year
2000-related errors. Based on this testing and evaluation, we believe that the
current versions of our products are capable of adequately distinguishing 21st
century dates from 20th century dates. We have attempted to limit our exposure
to Year 2000-related liability in our customer agreements. However, if any of
our customers experience Year 2000 problems as a result of their use of our
products, those customers could assert claims against us for damages which, if
successful, could materially adversely affect our business, financial condition
or results of operations. In addition, many of our products have third-party
technologies embedded in them, and our products, at times, are integrated into
enterprise systems involving sophisticated hardware and complex software
products. We cannot adequately evaluate these technologies or products for Year
2000 compliance. Not all of our material suppliers have warranted that their
products are Year 2000 compliant. A reasonable worst case scenario is that we
could lose current or potential customers, incur costs related to replacing
third party products or face claims under our warranties, or otherwise, based on
Year 2000 problems in other companies' products, or issues arising from the
integration of multiple products within an overall system, any of which could
have a material adverse effect on our business, financial condition or results
of operations. Since we are in the business of selling software products and
services, our risk of facing claims relating to Year 2000 issues is greater than
that of companies in some other industries.

     We will rely on many of PageNet's systems and operations during the time
period when Year 2000 issues may arise. PageNet implemented a task force and
developed a comprehensive plan to address

                                       11
<PAGE>   352

Year 2000 issues and, to date, it has not experienced any Year 2000-related
errors. However, our business, financial position, or results of operations
could be materially adversely affected by the failure of PageNet's computer
systems and applications, or those operated by other third parties, to properly
operate or manage dates beyond 1999.

     We believe that the purchasing patterns of customers and potential
customers may be affected by Year 2000 issues as companies expend significant
resources to correct or upgrade their current software systems for Year 2000
compliance. These expenditures may reduce the funds available to license
software products and purchase services such as those we offer. To the extent
Year 2000 issues significantly disrupt decisions to license our products or
purchase our services, our business, financial condition or results of
operations could be materially adversely affected.

     For a more detailed description of our Year 2000 assessment, see
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Year 2000 Compliance."

A LIQUID TRADING MARKET FOR OUR CLASS B COMMON STOCK LIKELY WILL NOT DEVELOP AND
THE MARKET PRICE OF OUR CLASS B COMMON STOCK COULD BE ADVERSELY AFFECTED.

     There is no established trading market for our Class B common stock. A
liquid trading market likely will not develop for our Class B common stock,
which would adversely impact its market price. We do not intend to apply for
listing of our Class B common stock on any securities exchange, or for quotation
through any quotation system. Further, our Class B common stock will not be
convertible into shares of our Class A common stock until the earlier of (1) the
second anniversary of the completion of the merger or (2) one year following the
completion of an underwritten public offering of common stock by us in which the
net proceeds of the offering exceeds $25 million. It is likely that an
underwritten public offering, if made, would be of our Class A common stock.

     The liquidity of any market and the market price for our Class B common
stock will depend on, among other things: (a) the number of holders of the Class
B common stock; (b) our performance; (c) the market for similar securities; (d)
the desire of former stockholders and debtholders of PageNet to continue to hold
our Class B common stock; and (e) the interest of securities dealers in making a
market in our Class B common stock. Even if a market for our Class B common
stock does develop there can be no assurance that it will continue.

OUR STOCK PRICE COULD BE HIGHLY VOLATILE.

     Our stock price could be highly volatile due to a number of factors,
including:

     - actual or anticipated fluctuations in our operating results;

     - announcements by us, our competitors or our customers;

     - changes in financial estimates of securities analysts or investors
       regarding our industry, our competitors or our customers;

     - technological innovations by us or by others;

     - the operating and stock price performance of other comparable companies
       or of our competitors or customers; and

     - general market or economic conditions.

     This risk may be heightened because our industry is new and evolving,
characterized by rapid technological change and susceptible to the introduction
of new competing technologies or competitors.

     In addition, the stock market has experienced significant price and volume
fluctuations that have particularly affected the trading prices of equity
securities of many technology companies. These price and volume fluctuations
often have been unrelated to the operating performance of the affected
companies. In the past, following periods of volatility in the market price of a
company's securities, securities class action

                                       12
<PAGE>   353

litigation has often been instituted against that company. This type of
litigation, regardless of the outcome, could result in substantial costs and a
diversion of management's attention and resources, which could materially and
adversely affect our business, financial condition or results of operations.

AVAILABILITY OF SIGNIFICANT AMOUNTS OF COMMON STOCK FOR SALE IN THE FUTURE COULD
ADVERSELY AFFECT THE PRICE OF YOUR CLASS B COMMON STOCK, AND SALES BY US OF
ADDITIONAL SHARES OF COMMON STOCK WOULD DILUTE YOUR OWNERSHIP INTEREST.

     Sales, or the availability for sale, of a substantial number of shares of
our Class B common stock in the public market or otherwise following the merger
could adversely affect the market price for our Class B common stock and make it
more difficult for us to sell common stock in the future at an appropriate time
and price. In addition, sales by us of common stock or other securities, such as
preferred stock or debentures convertible into shares of common stock, would
substantially reduce your percentage ownership of Vast. See "Shares Eligible for
Future Sale" for information regarding the number of shares of common stock
eligible for sale after the Arch merger.

ANTITAKEOVER PROVISIONS IN OUR ORGANIZATIONAL DOCUMENTS AND DELAWARE LAW MAKE
ANY CHANGE IN CONTROL OF US MORE DIFFICULT, MAY DISCOURAGE BIDS AT A PREMIUM
OVER THE MARKET PRICE AND MAY ADVERSELY AFFECT THE MARKET PRICE OF OUR STOCK.

     Our certificate of incorporation and bylaws contain provisions that may
have the effect of delaying, deferring or preventing a change in control of
Vast, may discourage bids at a premium over the market price of our common stock
and may adversely affect the market price of our common stock, and the voting
and other rights of the holders of our common stock. These provisions include:

     - the division of our board of directors into three classes serving
       staggered three-year terms;

     - removal of directors only for cause and only upon a 66 2/3% stockholder
       vote;

     - prohibiting stockholders from taking action by written consent or calling
       a special meeting of stockholders;

     - the ability to issue shares of our preferred stock without stockholder
       approval;

     - advance notice requirements for raising business or making nominations at
       stockholders' meetings; and

     - the adoption of a rights plan that would cause substantial dilution to a
       person or group that attempts to acquire us on terms not approved by our
       board of directors.

     Delaware corporation law also contains provisions that may delay, deter or
inhibit a future acquisition of Vast. See "Description of Vast Capital Stock"
for a description of these provisions.

                                       13
<PAGE>   354

                           FORWARD-LOOKING STATEMENTS

     This prospectus includes forward-looking statements. You can identify these
statements by forward-looking words such as "may," "will," "expect,"
"anticipate," "intend," "believe," "estimate" and "continue" or similar words.
You should read statements that contain these words carefully because they:

     - discuss our future expectations;

     - contain projections of our future results of operations or financial
       condition; or

     - state other "forward-looking" information.

     These forward-looking statements are subject to risks, uncertainties and
assumptions. The "Risk Factors" set forth above, as well as other cautionary
language in this prospectus, provide examples of risks, uncertainties and events
that may cause our actual results to differ materially from the expectations
described in these forward-looking statements.

                                       14
<PAGE>   355

                                DIVIDEND POLICY

     We have never declared or paid any dividends on our common stock. Further,
we do not anticipate paying any dividends on our common stock in the foreseeable
future and intend to retain all available funds for use in the operation and
development of our business.

                                USE OF PROCEEDS

     We will not receive any proceeds from the PageNet exchange offer or the
distribution of shares of our Class B common stock by PageNet to its
stockholders.

                                       15
<PAGE>   356

                            SELECTED FINANCIAL DATA

     The following table sets forth our selected historical and unaudited pro
forma financial data as of December 31, 1998 and September 30, 1999, and for the
four month period from September 1, 1998 (inception) through December 31, 1998
and the nine months ended September 30, 1999. The selected historical financial
data has been derived from our audited financial statements and notes. The
unaudited selected pro forma financial data gives effect to the following
transactions as if they were consummated as of September 30, 1999 with respect
to the unaudited pro forma condensed balance sheet, and as of September 1, 1998
with respect to the unaudited pro forma statements of operations:

     - the repayment of $10.0 million of the amounts due PageNet in October
       1999;

     - the anticipated contribution by PageNet of assets comprising a portion of
       the Gateway to Vast;

     - the anticipated forgiveness by PageNet of the $30.0 million, non-interest
       bearing note payable to PageNet; and

     - the anticipated forgiveness by PageNet of other amounts due PageNet.

     We expect the contribution of the assets comprising the Gateway and the
forgiveness of the $30.0 million, non-interest bearing note payable and other
amounts due PageNet to occur simultaneously with the completion of the Arch
merger and spinoff of Vast by PageNet. However, these transactions are subject
to certain approvals, including the approvals of PageNet's lenders under its
domestic credit facility.

     The following unaudited selected pro forma financial data is presented for
illustrative purposes only and does not necessarily predict the operating
results or financial position that would have occurred if the transactions had
been consummated on the dates indicated above, nor is it necessarily indicative
of future results of operations. You should read the following financial
information in conjunction with "Management's Discussion and Analysis of
Financial Condition and Results of Operations" and our financial statements and
related notes.

<TABLE>
<CAPTION>
                                                     HISTORICAL                     PRO FORMA
                                            ----------------------------   ----------------------------
                                            SEPTEMBER 1                    SEPTEMBER 1
                                            (INCEPTION)     NINE MONTHS    (INCEPTION)     NINE MONTHS
                                              THROUGH          ENDED         THROUGH          ENDED
                                            DECEMBER 31,   SEPTEMBER 30,   DECEMBER 31,   SEPTEMBER 30,
                                                1998           1999            1998           1999
                                            ------------   -------------   ------------   -------------
                                                                                   (UNAUDITED)
<S>                                         <C>            <C>             <C>            <C>
STATEMENTS OF OPERATIONS DATA
Total operating revenues..................  $    90,035    $    809,298    $    90,035    $    809,298
Total operating costs and expenses........    4,163,149      22,324,508      4,163,149      22,324,508
Loss from operations......................   (4,073,114)    (21,515,210)    (4,073,114)    (21,515,210)
Net loss..................................   (4,163,733)    (22,489,299)    (4,073,112)    (21,518,048)
Loss per common share -- basic and
  diluted.................................        (0.21)          (1.12)         (0.20)          (1.08)
</TABLE>

<TABLE>
<CAPTION>
                                             DECEMBER 31,   SEPTEMBER 30,                  SEPTEMBER 30,
                                                 1998           1999                           1999
                                             ------------   -------------                  -------------
                                                                                            (UNAUDITED)
<S>                                          <C>            <C>             <C>            <C>
BALANCE SHEET DATA
Current assets.............................  $   220,110    $ 30,464,605                    $20,424,605
Total assets...............................    2,355,685      33,000,017                     26,110,017
Amounts due PageNet........................    6,302,220      28,715,177                             --
Note payable to PageNet....................           --      30,000,000                             --
Stockholder's equity (deficit).............   (3,963,733)    (26,453,032)                    25,372,145
</TABLE>

                                       16
<PAGE>   357

                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     The following discussion and analysis of our financial condition and
results of operations should be read in conjunction with our financial
statements and notes appearing elsewhere in this prospectus. See
"Forward-Looking Statements."

BACKGROUND

     We began operation in September 1998, when PageNet formed a wireless
solutions division. Our historical financial results consist primarily of the
results of operations of Silverlake, which PageNet acquired in December 1998,
and the losses we have accumulated during the development and initial marketing
of the wireless solutions products and services we began offering on a limited
basis in late 1999. Silverlake's product line is a suite of software products
focusing on wireless communications, including one-way messaging and two-way
advanced communications. Although we intend to maintain both sales and service
of this product line, it is not a material part of our future growth strategy.

     We intend to derive future revenue from the sale of our wireless solutions
products and services which include custom product development, wireless access
to our Gateway, software licenses, maintenance contracts and monthly service
fees. Maintenance fee revenue will be based on a percentage of software license
fees. Development revenue will come from the development of custom applications
for specific customers. Monthly service revenue will be associated with airtime
on wireless networks, transactions that pass through our Gateway and information
content.

     Since our inception, we have been engaged primarily in product research and
development and developing markets for our wireless solutions products and
services. We have incurred significant operating losses as a result of these
start-up activities. However, we began offering some of these products and
services in late 1999, and believe that revenues from sales of these products
and services will grow rapidly.

RESULTS OF OPERATIONS

     Our historical financial statements include our results of operations from
September 1, 1998 and the results of operations of Silverlake from the date of
its acquisition, December 9, 1998. The assets and liabilities of PageNet
transferred to us have been accounted for on the basis of their historical cost.
Since our historical financial statements reflect our results of operations,
financial condition and cash flows as a component of PageNet, they may not be
indicative of our results of operations and financial position as an independent
company. As a result of our relationship with PageNet and its affiliates, we
have extensive related party transactions. These transactions have been
recognized on a basis determined by PageNet and Vast, which may not be
representative of the terms we could have negotiated with third parties.
Management believes the historical financial results include a reasonable
allocation of research and overhead costs incurred by PageNet on our behalf.
However, these amounts may not be indicative of the costs we would incur if
these services were performed by us or obtained from an independent third party.

     Because of our limited operating history, comparisons with prior periods
are not meaningful.

     Revenues. Total revenues were $90,035 for the four months ended December
31, 1998 and $809,298 for the nine months ended September 30, 1999. Revenues
consisted primarily of the sale of Silverlake products.

     Costs of revenues. Costs of revenues generally consisted of packaging,
material and other costs associated with our software products and amortization
of acquired developed technology which had been capitalized as a result of the
Silverlake acquisition. Costs of revenues were $23,963 for the four months ended
December 31, 1998 and $314,350 for the nine months ended September 30, 1999.

     Selling, general and administrative expenses. Selling, general and
administrative expenses primarily consist of personnel costs associated with
selling, marketing, general management and software management, as well as fees
for professional services and other related costs. Selling, general and

                                       17
<PAGE>   358

administrative expenses were $2,204,673 for the four months ended December 31,
1998 and $10,744,115 for the nine months ended September 30, 1999. Selling,
general and administrative expenses consisted primarily of salaries and benefits
for our direct sales force, our customer service and distribution personnel, and
our non-research and development technical and corporate staff. Salaries and
benefits for our corporate personnel, which include our executive officers, and
our business development, financial planning and human resources staff, also are
included. Other items included are professional fees, rent, travel, marketing
and trade shows.

     Research and development expenses. Research and development expenses
consist primarily of compensation and related costs from our technical area, for
both employees and outside consultants engaged in research and development
activities and, to a lesser extent, costs of materials relating to these
activities. We expense research and development costs as they are incurred.
Research and development costs were $340,013 for the four months ended December
31, 1998 and $2,975,043 for the nine months ended September 30, 1999.

     Allocated research and overhead expenses. PageNet allocated expenses of
$1,442,000 and $8,291,000 to us during the four months ended December 31, 1998
and nine months ended September 30, 1999, respectively, for information
technology support, management services, human resources management, and other
services, covering both research and development and general and administrative
activities. Amounts allocated to us for information technology support were
$114,800 for the four months ended December 31, 1998 and $3,894,000 for the nine
months ended September 30, 1999, and included services such as research and
development activities, maintenance of our Gateway and other technology used by
us, and other technology support services. Amounts allocated to us for
management services were $1,232,000 for the four months ended December 31, 1998
and $2,891,000 for the nine months ended September 30, 1999, and included
charges for executive functions, accounting and legal services, purchasing,
treasury, and other administrative functions. We were also allocated expenses of
$11,100 during the four months ended December 31, 1998 and $424,000 during the
nine months ended September 30, 1999 for human resources management and $84,100
during the four months ended December 31, 1998 and $1,082,000 during the nine
months ended September 30, 1999 for other general and administrative services.
These allocations are generally based on employee headcount or estimated usage
of the services provided by PageNet. We believe the expenses we have recognized
for the research and overhead services performed for us by PageNet are a
reasonable allocation of the costs incurred by PageNet on our behalf. However,
these amounts may not be indicative of the costs we would incur if we performed
these services or obtained them from an independent third party.

     Purchased in-process research and development. In connection with the
acquisition of Silverlake, we recorded a charge of $152,500 during the four
months ended December 31, 1998 for research and development activities in
process at the date of the acquisition. We used an independent third-party
appraiser to assess and value the in-process research and development. The
amount of the Silverlake purchase price allocated to in-process research and
development represents the estimated fair value, based on risk-adjusted cash
flows, of the one in-process research project that had not yet reached
technological feasibility and for which no alternative future use existed at the
date of the acquisition. The value assigned to the purchased in-process research
and development was determined by estimating the costs to develop Silverlake's
purchased in-process research and development into a commercially viable
product, estimating the resulting net cash flows from the project and
discounting the net cash flows to their present value. At the acquisition date,
the one in-process research and development project underway was approximately
60% complete, and total continuing costs to complete the project were expected
to be approximately $45,000. The project was successfully completed during 1999.
The rate utilized to discount the net cash flows to their present value was
based on Silverlake's weighted average cost of capital. However, given the
nature of the risks associated with the estimated growth, profitability and
developmental projects, Silverlake's weighted average cost of capital was
adjusted. The discount rate we utilized of 23% was intended to be commensurate
with Silverlake's corporate maturity and the uncertainties in the economic
estimates described above. The revenue estimates used to value the in-process
research and development were based on estimates of relevant market sizes and
growth factors, expected trends in technology and the

                                       18
<PAGE>   359

nature and expected timing of new product introductions. The estimates we used
in valuing in-process research and development were based upon assumptions we
believe to be reasonable but which are inherently uncertain and unpredictable.
However, our assumptions may be incomplete or inaccurate, and no assurance can
be given that unanticipated events and circumstances will not occur.

     Other income and expense. Other income and expense consists primarily of
interest expense on amounts due to PageNet. Interest expense on amounts due
PageNet was $90,621 for the four months ended December 31, 1998 and $971,251 for
the nine months ended September 30, 1999. Since our inception, PageNet has
funded the majority of our disbursements, transferred assets used in our
business to us, funded the acquisition of Silverlake, and performed various
administrative services for us. To the extent that PageNet has provided funds,
paid expenses and performed services on our behalf, we have been charged
interest at the rate PageNet pays under its domestic credit facility. The
weighted average interest rate on the amounts due PageNet, which is reset
monthly, was 7.59% and 7.51% during the four months ended December 31, 1998, and
the nine months ended September 30, 1999, respectively. This arrangement
resulted in interest expense that may not be representative of what we would
have paid if we were not affiliated with PageNet.

LIQUIDITY AND CAPITAL RESOURCES

     As of December 31, 1999, we had approximately $9.6 million in cash, which
we believe is sufficient to meet our obligations through the first quarter of
2000. However, we may not have sufficient liquidity to meet our obligations
through the second quarter of 2000. We are currently involved in discussions
with third parties regarding potential private equity investments, which, if
consummated, we would expect to close simultaneously with the Arch merger and
the spinoff of Vast. However, there can be no assurance that our efforts to
obtain such an equity investment will prove successful or that we will have
adequate liquidity to meet our obligations through the date of the spinoff.
Furthermore, we do not anticipate additional financing from PageNet, which is
currently precluded by the terms of its public indebtedness from further
borrowings under its domestic credit facility. PageNet is also currently
exploring certain strategic and financing alternatives to ensure its continued
liquidity through the consummation of the Arch merger. If PageNet's efforts are
unsuccessful or are delayed, or if its proposed merger with Arch is not
completed, PageNet may be required to reduce the level of its operations and/or
file for protection under Chapter 11 of the United States Bankruptcy Code to
restructure its obligations. These events would preclude any further investments
in Vast by PageNet and negatively impact our operations. The possibility of the
occurrence of these events also makes it more difficult for us to obtain
separate debt or equity financing prior to the spinoff of Vast.

     Since our inception, PageNet has funded our operations. Net cash used in
operating activities was $4,040,335 for the four months ended December 31, 1998
and $20,827,754 for the nine months ended September 30, 1999. The principal use
of cash in operating activities for both periods was to fund our losses from
operations. Net cash used in investing activities was $2,419,179 for the four
months ended December 31, 1998 and $1,280,816 for the nine months ended
September 30, 1999. Cash used in investing activities for the four months ended
December 31, 1998 was primarily for the purchase of Silverlake and includes the
cash portion of the purchase price along with the reimbursement to PageNet of
the value of the PageNet common stock issued in connection with the acquisition.
Cash used in investing activities for both periods also includes the acquisition
of property and equipment to support the expansion of our operations. As of
September 30, 1999, we owed PageNet $28,715,177 for funds provided, expenses
paid and services performed by PageNet on our behalf. In October 1999, we repaid
$10,040,000 of the amounts due PageNet.

     On September 30, 1999, we borrowed $30.0 million from PageNet under a
promissory note agreement. The PageNet note is due on demand by PageNet, has no
stated maturity, and does not bear interest. For financial reporting purposes,
we will recognize interest expense on the PageNet note in subsequent periods
based on the interest rate PageNet pays under its domestic credit facility,
which was the source of the funds loaned to us by PageNet, with a corresponding
increase to stockholder's equity. As

                                       19
<PAGE>   360

the PageNet note is payable on demand by PageNet, it has been classified as a
current liability in our September 30, 1999 balance sheet.

     In connection with the spinoff of Vast, we anticipate that PageNet will
forgive all amounts owed by Vast, including the $30.0 million, non-interest
bearing note. However, the forgiveness of the amounts we owe PageNet is subject
to certain approvals, including the approvals of PageNet's lenders under its
domestic credit facility. If PageNet does not forgive these amounts, we will not
be able to repay them unless we obtain other sources of financing.

     Successful implementation of our growth strategy will likely require access
to additional capital in the future. We currently have no credit facilities or
sources of additional capital in place other than our relationship with PageNet.
Since we do not anticipate any additional funding from PageNet or Arch following
their merger, we will likely seek additional debt and/or equity financings to
fund our future operations and growth strategy. Our ability to continue our
current operations and to grow our business could be limited unless we are able
to obtain additional capital through future debt or equity financings.

YEAR 2000 COMPLIANCE

     In the course of our business, we test and evaluate our software products
for Year 2000 compliance and, to date, we have not experienced any Year
2000-related errors. We will rely on many of PageNet's systems and operations
during the time period when Year 2000 issues may arise. PageNet has implemented
a task force and developed a comprehensive plan to address Year 2000 issues.
PageNet has completed all phases of its Year 2000 plan for its critical business
processes and, to date, has not experienced any Year 2000-related errors.
PageNet continues to utilize both internal and external resources to evaluate
and test its systems.

     We believe that all our mission critical vendors have successfully readied
their systems for the Year 2000 and, to date, have not experienced any Year
2000-related errors.

     We believe that we will not suffer a suspension or interruption of our
business due to a Year 2000-related failure. However, actual results could
differ materially from those anticipated, particularly due to the potential
impact of third-party products and services. Our business, financial position,
or results of operations could be materially adversely affected by the failure
of our computer systems and applications, or those operated by third parties, to
properly operate or manage dates beyond 1999. We cannot estimate the amount of
any potential liability or lost revenue.

INFLATION

     We do not believe that the relatively moderate rates of inflation over the
past two years have had a significant effect on our revenues or our financial
results.

                                       20
<PAGE>   361

                                    BUSINESS

OVERVIEW

     We offer integrated wireless solutions that connect businesses to their
employees, customers and remote assets, such as vending machines, automobiles
and storage tanks. We can provide these solutions on a full-service basis,
allowing our customers to completely outsource complex wireless solutions. Using
our expandable software platform (our Gateway), provisioning and service and
support operations, we are able to provide our customers with a comprehensive
end-to-end wireless solution that seamlessly connects their mobile users with
the Internet or corporate data network using wireless devices. Our solution
enables corporations to offer a more personalized and powerful wireless data
solution. We believe our principal assets are our wireless software and software
development capabilities, our Gateway, our enterprise application provider
partners and our ability to manage our customers' wireless data operations.

WIRELESS DATA OPPORTUNITIES

     As businesses and individuals have become increasingly dependent on e-mail,
Internet-based services and corporate data networks, or intranets and extranets,
demand for wireless access to these resources has increased dramatically.
According to publicly available estimates, the U.S. wireless data market will
grow from 3 million subscribers in 1999 to 36 million subscribers in 2003. We
believe that four factors are driving the development of the wireless data
market:

     - Growth of the Internet, Intranets and Extranets. The Internet and
       corporate data networks have emerged as mission critical business tools
       that allow users to communicate and conduct transactions electronically
       over distributed geographic areas. In recent years, investment in
       corporate data networks has grown substantially as businesses attempt to
       equip their employees with the means to increase their productivity.
       However, in most cases users of these networks are currently limited to
       wired connections.

     - Emergence of Mobile Workforce. One industry analyst, International Data
       Corporation, forecasts that the remote and mobile workforce in the United
       States will grow from 35.7 million individuals at the end of 1999 to 47.1
       million at the end of 2003. We believe that workers and consumers have
       grown accustomed to and dependent upon the information and applications
       available on their corporate data networks and personal computers, and
       they want access to similar information when they are away from their
       office or home.

     - Proliferation of Wireless Devices. There are an increasing number of
       wireless devices capable of sending and receiving data, many of which are
       being rapidly adopted by businesses. Many of the latest communication
       devices in the United States, including personal digital assistants, or
       PDAs, pagers and mobile phones, are wireless data enabled, smaller and
       less expensive, and have longer battery life and more features than
       earlier devices. Another important development has been the increasing
       availability of fixed wireless, or "telemetry" devices, that enable
       businesses to connect wirelessly with remote assets, such as vending
       machines and storage tanks.

     - Build-Out of Wireless Data Networks. In anticipation of accelerating
       adoption of mobile Internet devices, digital wireless carriers worldwide
       are in the process of upgrading their networks to support the
       transmission of data. Recently, major wireless carriers have launched or
       announced the availability of data service in addition to their existing
       voice service capabilities. These carriers are also expanding the
       geographic coverage of their networks.

     Although we believe these four developments have increased demand for
wireless data solutions, businesses seeking to implement a wireless solution
still face four primary challenges: disparate and complex networks and devices,
different communication protocols and data standards, capacity limitations and
complex operational issues.

     - Disparate and Complex Networks and Devices. Today, many wireless network
       technologies exist and new technologies are continually being developed.
       Each network technology has its own

                                       21
<PAGE>   362

       communication protocol and other unique characteristics. In addition,
       each network technology supports different user devices. Businesses need
       to have the ability to run their applications in a secure manner across
       disparate networks and on multiple user devices. At present, there are
       many competing networks and technologies with a range of capabilities,
       each able to support digital wireless data transmission. These networks
       include: Reflex, offered by PageNet, WebLink Wireless and MCI Worldcom;
       MobiTex, offered by BellSouth; digital PCS, offered by the nationwide
       voice carriers; and cellular digital packet data (CDPD), offered by the
       major analog cellular carriers.

     - Different Communication Protocols and Data Standards. There are a number
       of different languages for expressing data, such as hyper-text markup
       language (HTML), wireless markup language (WML) and hand-held device
       markup language (HDML). There are also different protocols for
       transmitting the data, such as hyper-text transfer protocol (HTTP) and
       wireless application protocol (WAP). In addition to these languages and
       protocols, many networks and devices use their own proprietary protocol
       and data format, which adds another layer of complexity to any wireless
       data solution. This environment of multiple languages and protocols
       presents difficult challenges for organizations seeking to implement a
       robust wireless data solution. For example, supporting multiple data
       languages can add significant data overhead and translating from one
       language to another or switching from one protocol to another can add
       significant airtime expense.

     - Capacity Limitations. Currently, the speed and bandwidth of a wireless
       network is only a fraction of that of a wired network. We expect wireless
       networks to continue to lag behind wired networks in terms of speed and
       bandwidth for the foreseeable future. We believe that the demands placed
       on wireless networks for improved speed and performance will continue to
       outpace the ability of wireless network providers to add capacity.

     - Complex Operational Issues. The implementation of a wireless network
       presents businesses with a wide range of operational issues, including
       provisioning, customer service and integrated billing. Many corporations
       and enterprise application providers lack the engineering talent and
       overall resources necessary to design, develop, implement and manage
       wireless access solutions. We believe businesses will increasingly look
       to third-party integrators to implement and manage these solutions.

OUR SOLUTION

     We offer integrated wireless solutions that connect businesses to their
employees, customers and remote assets, such as vending machines, automobiles
and storage tanks. We can provide these solutions on a full-service basis,
allowing our customers to completely outsource complex wireless solutions. Using
our expandable software platform (our Gateway), provisioning and service and
support operations, we are able to provide our customers with a comprehensive
end-to-end wireless solution that seamlessly connects their mobile users with
the Internet or corporate data network using wireless devices. We provide the
equipment, servers, billing systems, training and support needed to offer mobile
access to enterprise applications, Internet services, messaging and e-commerce.
Using our solution, a mobile workforce can stay continuously connected to
enterprise applications and perform necessary tasks while at home, in the
office, on the road, at a meeting or at a job site.

     Our solution is comprised of the following elements:

     Wireless Software System Design and Development. Our software design and
development capabilities allow corporations and enterprise software providers to
extend Internet and corporate enterprise applications to most available wireless
devices. We can develop, implement, support and manage wireless software
applications for use on many types of devices, including the Palm V and Palm
VII, Motorola's PageWriter 2000X, Research in Motion's 950 and Hewlett Packard's
Jornada. Our software platform is expandable and specifically designed to
maximize the efficient use of limited bandwidth. In addition, our device
software includes an intuitive and user-friendly interface specifically designed
for the limited display and input capabilities inherent in wireless devices.
Using our proprietary software design, we develop intuitive and fast wireless
Internet applications that more closely mirror a customer's enterprise network
environment.
                                       22
<PAGE>   363

     Our Gateway. The core of our technical solution is our Gateway, which
provides a process architecture and software platform for creating more
effective wireless solutions, faster and with less risk. Our Gateway makes
wireless solutions easier to adopt by handling most of the technical
complexities that these solutions bring. Our Gateway consists of network servers
running our proprietary software. Our Gateway manages the differences between
individual networks and devices, providing a single, standard interface to the
corporate enterprise. Our Gateway adapts and translates data transmissions for
many wireless network protocols, formats the transmissions for particular user
devices and optimizes the data in a bandwidth efficient manner for transmission
over a wireless network. Our Gateway accepts data from most protocols and data
formats. When data is received from an Internet or intranet application, our
Gateway queries its internal database to identify the target user's wireless
network and device. With this information, our Gateway formats the data for
effective user presentation, such as the number of characters and display color,
and packages the data for a specific network protocol, such as Reflex, MobiTex
or CDPD. Our Gateway also optimizes the transfer of information by leveraging
the compression and encryption technologies unique to specific networks and
devices. This significantly enhances an application's performance and reduces
the airtime expense associated with operating a wireless access solution. Our
Gateway also facilitates wireless extensions of corporate e-mail applications
and the delivery of personalized wireless content, such as news and sports.

     Wireless Device Development and Integration. We design and develop custom
wireless devices for unique telemetry applications that can connect a business
to its remote assets, such as vending machines, automobiles and storage tanks.
We integrate these devices with commercially available wireless modems designed
for the appropriate network technology. In addition, we can provide custom
packaging for applications that have specific requirements, such as stringent
environmental specifications.

     Internet-Based Provisioning and Customer Support. We can provide our
customers with a privately branded web-portal that allows users to order
wireless devices and contact customer support over the Internet. We offer a
web-based support system that includes credit card billing, e-mail customer
support, on-line training and software downloads. Through our customer support
center, we manage all operational components of our wireless solution including
distribution, coverage, billing and technical support.

STRATEGY

     Our objective is to be a leading provider of integrated wireless solutions
that enable constant connectivity between businesses and their employees,
customers and remote assets. The key elements of our strategy include:

     Continue to Expand Our Technical Capabilities. We plan to continue to
expand the technical capabilities of our Gateway, as well as to incorporate new
technologies. We are continuing to develop the expertise to offer applications
on a variety of data capable wireless devices, from PDAs to WAP phones to
interactive paging devices. We are also continuing to expand our software
development capabilities in order to provide custom solutions to specific
customer requirements. We expect to grow through internal growth, as well as
through relationships with leading enterprise application providers and selected
acquisitions.

     Expand into New Markets/Channels. We plan to establish new markets/channels
by partnering with leading enterprise application providers, expanding our
direct sales efforts and entering international markets.

     - Extend Our Strategic Alliances With Additional Enterprise Application
       Providers. As a pioneer in the area of wireless connectivity for
       enterprise software applications, we are joining with leading enterprise
       application providers and e-commerce companies to extend their popular
       enterprise software platforms to the wireless/mobile environment. Our
       current relationships with leading enterprise application providers allow
       us to leverage their sales force and installed base of customers to
       quickly market a packaged wireless solution. We have found that these
       providers value our ability to enhance their product offerings by
       developing the wireless aspects of the solution, allowing them to focus
       on their core business and customers.

                                       23
<PAGE>   364

     - Expand Our Direct Sales Channel. We are working closely with a number of
       corporations to develop mobile and telemetry solutions that are highly
       integrated with their internal business systems. Our sales engineers work
       closely with our customers to understand their current business systems
       and to design customized wireless solutions that we believe will
       substantially improve their bottom-line performance.

     - International Expansion. We believe that opportunities, like the ones
       present in the U.S. market, also exist in portions of Europe and Asia
       that have advanced wireless networks. We plan to expand into these
       international markets as quickly as possible in order to capitalize on
       these opportunities.

SALES AND MARKETING

     We currently market our products through a direct sales force and through
relationships with enterprise application providers. Our direct sales force is
located in major business centers in the United States. These individuals target
major corporate customers, generally the top 1,000 U.S. companies as measured by
sales, to sell custom solutions for their mobile employees, their remote assets
or their customers.

     Working with enterprise application providers, we jointly develop a
wireless extension that is integrated with their standard software offerings,
thereby enhancing the value of the overall offering. We market these wireless
extensions to the providers' installed base of customers, through their sales
force and through our own sales professionals. In this way we are able to
leverage each provider's sales force, brand name and installed base of
customers.

     We also establish customer and marketing relationships through our business
development group. Our senior executives work very closely with our business
development group to build relationships that are large in scope and will
leverage our products and intellectual property into new applications or extend
current applications into new markets.

WIRELESS NETWORK, CONTENT AND EQUIPMENT PROVIDERS

     Through our current affiliation with PageNet, we have established
relationships with network providers for airtime for both telemetry applications
and for mobile employees. These relationships include: PageNet, Arch, MCI
Worldcom and BellSouth. Prior to completion of the Arch merger, we plan to enter
into new agreements with these carriers, as well as expand these relationships
to include several of the nationwide analog cellular and PCS companies, such as
AT&T and Sprint.

     In addition to airtime, we are establishing relationships with several
network providers that would allow us to provide wireless software integration
services to their larger customers. We believe network providers' sales
organizations encounter opportunities that require custom integration and which
the network providers are unable or unwilling to provide. We plan to provide our
services jointly with them in order to develop custom applications for their
customers.

     We are completing arrangements with PageNet and Arch to provide customized
content, such as news, weather and sports, to their customers. We are seeking
arrangements whereby we would manage the content aggregation with a partner or
partners and market content services to the combined entity's customers.
Currently, approximately 17% of PageNet's customers and 23% of Arch's customers
use alphanumeric messaging devices, some of which may be capable of receiving
our content services.

     We have established relationships with equipment providers, such as
Motorola, to resell their hardware to our customers. As part of our integrated
service offering, we distribute the devices to the end users. As more wireless
devices become available, and as more companies provide equipment, we plan to
expand these relationships.

                                       24
<PAGE>   365

COMPETITION

     The market for our services is becoming increasingly competitive. We
believe we offer a comprehensive solution to businesses necessary to make
possible the development, offering and ongoing support of wireless data
communications for their employees, customers and remote assets. The widespread
adoption of industry standards may make it easier for existing competitors to
introduce some or all of the services they do not now provide, or improve the
quality of their services. We assess potential competitors based primarily on
their management, functionality and range of services, the security and
scalability of their architecture, and their customer base, geographic focus and
capitalization. Our current and potential competitors include:

     - Wireless data services providers, such as Wireless Knowledge, a joint
       venture of Microsoft and Qualcomm Incorporated, Aether Systems, Research
       In Motion, Go America, mobilefinance.com, Logica and Infospace.com;

     - Wireless communications software companies, including Phone.com, Nettech
       Systems Inc., Dynamic Mobile Data, Mobimagic Co., a newly formed joined
       venture between Microsoft and NTT Mobile, and 724 Solutions Inc.;

     - Wireless systems integrators, such as IBM and GTE Corporation;

     - Wireless device manufacturers, such as Ericsson, Motorola, Nokia and
       Matsushita; and

     - Wireless network carriers, such as AT&T Wireless Services, Bell Atlantic
       Mobile, Sprint PCS, Nextel Communications, Inc., Airtouch, Omnipoint,
       Metricom, Inc., BellSouth, MCI Worldcom and WebLink Wireless.

     As we expand to include international operations, we likely will face
competition from several companies that have announced wireless data service
initiatives abroad, including Vodafone, British Telecom, Cellnet, Organ and One
2 One in the U.K., Deutsche Telecom and Starhub in continental Europe, and NTT
DoCoMo, DDI and IDO in Japan.

     Many of our existing and potential competitors have substantially greater
financial, technical, marketing and distribution resources than we do.
Additionally, many of these companies have greater name recognition and more
established relationships with our target customers. Furthermore, these
competitors may be able to adopt more aggressive pricing policies and offer
customers more attractive terms than we can.

INTELLECTUAL PROPERTY RIGHTS

     We rely on a combination of copyright, trademark, service mark, trade
secret laws and contractual restrictions to establish and protect certain
proprietary rights in our services. PageNet holds a preliminary patent
application on a portion of our Gateway technology, which it has agreed to
transfer to us at the closing of the Arch merger, subject to certain approvals,
including the approvals of PageNet's lenders under its domestic credit facility.
This patent application covers the architecture for message processing and
routing used in our Gateway.

     We own one federal trademark, Airsource(R), and have applications for
federal registration or common law rights in several other trademarks. In
addition, we own applications for federal registration or common law rights in
the following service marks: Vast Gateway(SM), Vast Online(SM), Vast
Solutions(SM) and Vast Wireless Solutions(SM). This prospectus also includes
trade names and trademarks of other companies. All other brand names or
trademarks appearing in this prospectus are the property of their respective
holders.

     We rely on certain technologies that we license from third parties,
including certain Gateway software currently licensed by PageNet from Tibco
Software, Inc., as well as third-party software contained in administrative
systems operated by PageNet. Tibco has agreed to the assignment of a portion of
PageNet's license to us. We will also rely on data feeds and related software
from Reuters and other information content aggregators. Other third-party
technology licenses may not continue to be available to us on commercially
attractive terms. The loss of the ability to use such technology could require
us to obtain the

                                       25
<PAGE>   366

rights to use substitute technology, which could be more expensive or offer
lower quality or performance, and therefore have a material adverse effect on
our business, financial condition or results of operations.

     Third parties could claim infringement by us with respect to current or
future services. We expect that participants in our markets will be increasingly
subject to infringement claims as the number of services and competitors in our
industry segment grows. Any such claim, whether meritorious or not, could be
time-consuming, result in costly litigation, cause service installation delays
or require us to enter into royalty or licensing agreements. Such royalty or
licensing agreements might not be available on terms acceptable to us or at all.
As a result, any such claim could have a material adverse effect upon our
business, financial condition or results of operations.

GOVERNMENTAL REGULATION

     We are not currently subject to direct federal, state or local government
regulation, other than regulations that apply to businesses generally. The
wireless network carriers we contract with to provide airtime are subject to
regulation by the Federal Communications Commission. Changes in FCC regulations
could affect the availability of wireless coverage these carriers are willing or
able to sell to us. We could also be adversely affected by developments in
regulations that govern or may in the future govern the Internet, the allocation
of radio frequencies or the placement of cellular towers. Also, changes in these
regulations could create uncertainty in the marketplace that could reduce demand
for our services or increase the cost of doing business as a result of costs of
litigation or increased service delivery cost or could in some other manner have
a material adverse effect on our business, financial condition or results of
operations.

     We currently do not collect sales or other taxes with respect to the sales
of services or products in states and countries where we believe we are not
required to do so. We do collect sales and other taxes in the states where we
have offices and believe we are required by law to do so. One or more
jurisdictions have sought to impose sales or other tax obligations on companies
that engage in online commerce within their jurisdictions. A successful
assertion by one or more jurisdictions that we should collect sales or other
taxes on our products and services, or remit payment of sales or other taxes for
prior periods, could have a material adverse effect on our business, financial
condition or results of operations.

     Any new legislation or regulation, or the application of laws or
regulations from jurisdictions whose laws do not currently apply to our
business, could have an adverse effect on our business.

FACILITIES

     Our principal offices cover 24,606 square feet in an office complex located
in Addison, Texas. Under the current lease, which commenced on May 10, 1999 and
expires on May 31, 2004, we pay an annual base rent of $516,726. We have the
right to extend the term of the lease for up to an additional 60 months. We have
the right of first refusal on certain additional space in the building. Although
this facility is adequate for our current needs, we expect that we will need
additional space in the future.

     In addition to our offices in Addison, we rent office space in the Los
Angeles area. Our current office is approximately 3,500 square feet and the
lease has been extended to expire on February 28, 2000. We have entered into a
new lease for 11,381 square feet in a new location in the Los Angeles area,
which will commence in March 2000. We will pay an annual base rent of $261,926
and the lease will expire in March 2007.

EMPLOYEES

     As of January 4, 2000, our workforce was comprised of 99 full-time
employees. We also utilize the services of 34 software developers and 5 customer
support representatives through independent contractor relationships with
various third parties. None of our employees is covered by a collective
bargaining agreement. We believe that our relations with our employees are good.

LEGAL PROCEEDINGS

     We are not currently subject to any legal proceedings.

                                       26
<PAGE>   367

                                   MANAGEMENT

EXECUTIVE OFFICERS AND SOLE DIRECTOR

     The following table describes our executive officers and our current sole
director. We will add additional members to our board of directors before
completion of the Arch merger, some of whom may be members of PageNet's existing
board of directors. Although Vast was incorporated in Delaware in December 1999,
our operations continue the activities of PageNet's wireless solutions division
and the relevant experience of many of our executive officers includes the
management of those operations.

<TABLE>
<CAPTION>
                   NAME                       AGE                         POSITION
                   ----                       ---                         --------
<S>                                           <C>    <C>
John P. Frazee, Jr. ......................     55    Chairman of the Board and Chief Executive Officer
Mark A. Knickrehm.........................     37    President and Chief Operating Officer
Julian B. Castelli........................     31    Acting Chief Financial Officer
Scott D. Grimes...........................     37    Senior Vice President-Business Development
Steve Leggett.............................     51    Senior Vice President-Sales
Christopher C. Sanders....................     47    Senior Vice President-Marketing
William G. Scott..........................     43    Chief Technology Officer
</TABLE>

     John P. Frazee, Jr., has been our Chairman of the Board and Chief Executive
Officer since December 1999. He has been a Director of PageNet since 1995 and
has served as Chairman of the Board of Directors and Chief Executive Officer of
PageNet since June 1999. From August 1997 through June 1999, Mr. Frazee served
as Chairman of the Board, President and Chief Executive Officer of PageNet. Mr.
Frazee was a private investor from August 1993 to August 1997 and served as
President and Chief Operating Officer of Sprint Corporation from March 1993 to
August 1993. Prior to that time, Mr. Frazee had been Chairman and Chief
Executive Officer of Centel Corporation, a telecommunications company, from
April 1988 to January 1993. Mr. Frazee also serves as a director of Security
Capital Group, Inc., Dean Foods Company and Homestead Village Incorporated.

     Mark A. Knickrehm has been our President and Chief Operating Officer since
December 1999 and served in a similar capacity for the wireless solutions
operations of PageNet from June 1999 through December 1999. He served as
Executive Vice President and Chief Financial Officer for PageNet from February
1998 through June 1999. Prior to that time, Mr. Knickrehm was employed by
McKinsey & Company, an international consulting firm, from 1989 to February
1998, serving as a Partner since 1995.

     Julian B. Castelli has been our acting Chief Financial Officer since
December 1999. He has served as Senior Vice President and Chief Financial
Officer of PageNet since June 1999. Mr. Castelli served as Vice President and
Treasurer of PageNet from July 1998 to June 1999. Prior to joining PageNet, Mr.
Castelli was employed by McKinsey & Company, an international consulting firm,
from August 1995 to July 1998, serving as Engagement Manager from June 1997. Mr.
Castelli served in the Corporate Finance Department of Goldman, Sachs & Co. as
an analyst from 1990 to 1993.

     Scott D. Grimes has been our Senior Vice President-Business Development
since December 1999 and served in a similar capacity for the wireless solutions
operations of PageNet from June 1999 through December 1999. He served as Senior
Vice President-Advanced Wireless Integration Group for PageNet from January 1999
through June 1999. Mr. Grimes served as Senior Vice President-Sales Development
and Operations for PageNet from April 1998 to January 1999, during which time he
was responsible for the establishment of the Advanced Wireless Integration
Group. Prior thereto, Mr. Grimes was employed by McKinsey & Company, an
international consulting firm, from 1991 to April 1998, serving as a Partner
since 1996.

     Steve Leggett has been our Senior Vice President-Sales since December 1999
and served in a similar capacity for the wireless solutions operations of
PageNet from September 1999 through December 1999. From January 1995 to July
1999, he served in various sales positions with Platinum Technology, Inc., a
software consulting firm, serving most recently as Senior Vice President,
Northeast Region. Prior to that

                                       27
<PAGE>   368

time, Mr. Leggett was Executive Vice President of Marketing and Sales for the
Meta Group, an information technology analytical and consulting firm.

     Christopher C. Sanders has been our Senior Vice President-Marketing since
December 1999. From January 1999 to December 1999, Mr. Sanders served as a
Principal of Neteligence, an Internet-related consulting firm. From September
1997 to January 1999, he served as Senior Vice President of Merant, Inc.,
formerly known as Micro Focus, Inc., a software vendor of enterprise
applications. From 1995 to September 1997, he served as Vice President of
Platinum Technology, Inc., a software vendor. Prior to that, Mr. Sanders served
as Vice President and General Manager of Locus Computing Corporation, a software
developer.

     William G. Scott has been our Chief Technology Officer since December 1999
and served in a similar capacity for the wireless solutions operations of
PageNet from June 1999 through December 1999. He served as Senior Vice
President-Systems and Technology for PageNet from February 1997 through June
1999 and as Vice President-Systems and Technology for PageNet from December 1995
to February 1997. Before that, Mr. Scott served as President of Lion Software,
Inc. from 1993 to 1995.

BOARD COMMITTEES

     We plan to establish an audit committee and a compensation committee. The
audit committee will review our internal accounting procedures and consider and
report to our board of directors on the other auditing and accounting matters,
including the selection of our independent auditors, the scope of annual audits,
fees to be paid to our independent auditors and the performance of our
independent auditors. The audit committee will be composed solely of directors
who are not our employees or affiliated with our management. The compensation
committee will review and recommend to our board of directors the salaries,
benefits and stock option grants of all employees, consultants, directors and
other individuals we compensate. The compensation committee will also administer
our stock option and other employee benefits plans. Our board of directors may
from time to time establish other committees.

EXECUTIVE COMPENSATION

     The following table summarizes all compensation paid to our Chief Executive
Officer and other executive officers whose total annual salary and bonus during
the period they were dedicated to the activities of Vast or PageNet's wireless
solutions division exceeded $100,000 for the fiscal year ended December 31,
1999. These persons are referred to in this prospectus as the named executive
officers.

<TABLE>
<CAPTION>
                                                                                              LONG-TERM
                                                                                            COMPENSATION
                                                                                               AWARDS
               NAME AND                                                                 ---------------------
              PRINCIPAL                                             OTHER ANNUAL        SECURITIES UNDERLYING
               POSITION                    SALARY      BONUS     COMPENSATION (6)($)         OPTIONS (#)
              ---------                   --------    -------    -------------------    ---------------------
<S>                                       <C>         <C>        <C>                    <C>
John P. Frazee, Jr. (1)...............          --         --              --                      --
  Chairman and Chief
  Executive Officer
Mark A. Knickrehm (2).................    $164,423         --          $2,169                      --
  President and Chief
  Operating Officer
Scott D. Grimes (3)...................     199,680    $45,400(5)        5,316(7)               30,000(9)
  Senior Vice President-
  Business Development
William G. Scott (4)..................     112,500         --           2,776(8)                   --
  Chief Technology Officer
</TABLE>

- ---------------
(1) Mr. Frazee, who serves as Chairman and Chief Executive Officer of PageNet,
    did not receive any compensation on account of serving as Chairman and Chief
    Executive Officer of Vast, positions he was elected to hold in December
    1999.

                                       28
<PAGE>   369

(2) Represents compensation from June 1999.

(3) Represents compensation from January 1999.

(4) Represents compensation from June 1999.

(5) Represents annual bonus for services rendered to PageNet in 1998.

(6) Except where noted, represents premiums paid under Executive Long Term
    Disability Plan.

(7) Includes a matching contribution of $5,000 to Mr. Grimes' 401(k) plan.

(8) Includes a matching contribution of $1,714 to Mr. Scott's 401(k) plan.

(9) Options represent options to purchase PageNet common stock.

2000 LONG TERM STOCK INCENTIVE PLAN

     Our Board plans to adopt, subject to the approval of our sole stockholder,
our 2000 Long Term Stock Incentive Plan. Under this plan, we may grant stock
options, stock appreciation rights, shares of common stock and performance units
to our employees and consultants. The total number of shares of our Class A
common stock that we may award under this plan is                shares, which
may be adjusted in some cases. The shares may be newly issued shares or shares
purchased in the open market or in private transactions. We anticipate granting
options to acquire shares of our Class A common stock only.

     Our compensation committee will administer our long term stock incentive
plan. Prior to the creation of our compensation committee, our long term stock
incentive plan will be administered by PageNet's compensation committee. This
plan essentially gives the compensation committee sole discretion and authority
to:

          - select those employees and consultants to whom awards will be made;

          - designate the number of shares covered by each award;

          - establish vesting schedules and terms of each award;

          - specify all other terms of awards; and

          - interpret the plan.

     Options awarded under our long term stock incentive plan may be either
incentive stock options or nonqualified stock options. Incentive stock options
are intended to satisfy the requirements of Section 422 of the Internal Revenue
Code, while nonqualified stock options are not. We may grant stock appreciation
rights in connection with options, or as free-standing awards. If a participant
exercises an option, he or she will surrender the related stock appreciation
right. At a minimum, the exercise price of an option or stock appreciation right
must be at least 100% of the fair market value of a share of Class A common
stock on the date on which we grant the option or stock appreciation right.
Options and stock appreciation rights will be exercisable and will expire in
accordance with the terms set by the compensation committee. Under this plan,
all options and stock appreciation rights must expire within ten years after
they are granted. If a stock appreciation right is issued in connection with an
option, the stock appreciation right will expire when the related option
expires. Special rules and limitations apply to stock options which are intended
to be incentive stock options. Our compensation committee also may impose
restrictions on shares of our common stock that are issued upon the exercise of
options and stock appreciation rights under this plan.

     Under our long-term stock incentive plan, our compensation committee may
grant common stock awards to participants. During the period that a stock award
is subject to restrictions or limitations, the participants may receive dividend
rights awards relating to the shares.

     Our compensation committee may award plan participants performance units
which entitle the participant to receive value for the units at the end of a
performance period, if and to the extent the award so provides. Our compensation
committee will establish the number of units and the performance measures and
periods when it makes an award.

                                       29
<PAGE>   370

     All awards under our long term stock incentive plan will accelerate and
become fully vested if a change in control, as defined by the plan, of Vast
occurs.

     Prior to completion of the Arch merger, we expect to grant options to
purchase           shares of our Class A common stock to our named executive
officers and other personnel. These option grants will be reviewed and
authorized by PageNet's compensation committee.

     The 2000 Long Term Stock Incentive Plan also contains an employee stock
option purchase plan component. We do not intend to implement this purchase plan
until such time as our Class A common stock is listed on a securities exchange
or quoted on Nasdaq.

STOCK OPTION GRANTS IN LAST FISCAL YEAR

     Some of our employees received grants of options to purchase PageNet common
stock during 1999 at a time when they were primarily involved in Vast
activities. The following table summarizes all such option grants to the named
executive officers for the year ended December 31, 1999.

<TABLE>
<CAPTION>
                                                            % OF TOTAL
                                            NUMBER OF        OPTIONS
                                              SHARES        GRANTED TO                                  PRESENT
                                            UNDERLYING      EMPLOYEES                                    VALUE
                                             OPTIONS            IN          EXERCISE    EXPIRATION      ON DATE
                  NAME                       GRANTED      FISCAL YEAR(1)     PRICE         DATE       OF GRANT(2)
                  ----                      ----------    --------------    --------    ----------    -----------
<S>                                         <C>           <C>               <C>         <C>           <C>
Scott D. Grimes.........................      30,000          0.74%          $6.125      01/20/09      $142,200
</TABLE>

- ---------------
(1) As a percent of options granted to all PageNet employees in fiscal year.

(2) The determination of the present value of this option to purchase PageNet
    common stock on the date of the grant is based on the Black-Scholes pricing
    model. The estimated value under the Black-Scholes model is based on
    standard assumptions as to variables in the model such as stock price
    volatility, projected future dividend yield and interest rates. In addition,
    the estimated value is discounted for potential forfeiture due to vesting
    schedules. The estimated Black-Scholes value is based on the following key
    variables: volatility -- 67.05%; dividend yield -- 0%; risk-free interest
    rate -- yield to maturity of 10-year treasury note at grant date -- 4.745%.
    The actual value, if any, that Mr. Grimes may realize will depend on the
    excess of the stock price over the exercise price on the date the option is
    exercised. There is no assurance that the value realized by Mr. Grimes will
    be at or near the value estimated using the Black-Scholes model. Currently,
    this stock option has minimal value because the trading price of PageNet
    shares is below the option exercise price.

                                       30
<PAGE>   371

                     ARRANGEMENTS BETWEEN VAST AND PAGENET

     Since our inception, there have been significant transactions between us
and PageNet involving services (such as information technology support,
management services, human resources management and other administrative
services). See Note 3 to the Notes to Financial Statements. For purposes of
governing certain on-going relationships between us and PageNet, we and PageNet
will enter into (or continue in effect) various agreements and relationships.

                             PRINCIPAL STOCKHOLDERS

     As of the date of this prospectus, PageNet owns all 3,900,000 outstanding
shares of our Class A common stock and all 16,100,000 outstanding shares of our
Class B common stock. Following the exchange by PageNet of 13,780,000 shares of
our Class B common stock and 616,830,757 shares of PageNet common stock for up
to $1.2 billion of PageNet's senior subordinated indebtedness and the
distribution by PageNet of the remaining 2,320,000 shares of our Class B common
stock to its stockholders immediately prior to the merger of PageNet into a
subsidiary of Arch, PageNet will own no shares of our Class B common stock.
After the merger, Arch will indirectly own all of the outstanding shares of our
Class A common stock, which will constitute 19.5% of our outstanding common
stock.

     The address of PageNet is 14911 Quorum Drive, Dallas, Texas 75240. The
address of Arch is 1800 West Park Drive, Suite 250, Westborough, Massachusetts
01581.

     We are not aware of any person who will beneficially own more than 5% of
the outstanding shares of our Class B common stock after the merger.

                                       31
<PAGE>   372

                        SECURITY OWNERSHIP OF MANAGEMENT

OWNERSHIP OF VAST COMMON STOCK

     The following table sets forth information with respect to the expected
beneficial ownership of our Class B common stock by each of our directors, by
each of our named executive officers and by all directors and executive officers
as a group based on their ownership as of December 1, 1999 of PageNet common
stock. Except as indicated in the footnotes to the table, the persons named in
the table will have sole voting and investment power with respect to all shares
of Class B common stock beneficially owned by them. None of our directors or
executive officers beneficially own any shares of our Class A common stock.

<TABLE>
<CAPTION>
                                                                SHARES OF CLASS B
                                                                   COMMON STOCK
NAME                                                            BENEFICIALLY OWNED    PERCENT OF CLASS
- ----                                                            ------------------    ----------------
<S>                                                             <C>                   <C>
John P. Frazee, Jr..........................................          2,748                  *
Mark A. Knickrehm...........................................             --                  *
Scott D. Grimes.............................................             --                  *
William G. Scott............................................            176                  *
All directors and executive officers as a group (7
  persons)..................................................          2,972                  *
</TABLE>

- ---------------
 *  Represents less than 1%

OWNERSHIP OF PAGENET COMMON STOCK

     The following table sets forth information as of December 1, 1999 with
respect to the beneficial ownership of PageNet common stock by each of our
directors, each of our named executive officers and by all of our directors and
executive officers as a group. Except as indicated in the footnotes to the
table, the persons named in the table have sole voting and investment power with
respect to all shares of PageNet common stock beneficially owned by then. The
number of shares beneficially owned includes shares covered by options that are
vested and exercisable as of December 1, 1999 or within 60 days of such date.

<TABLE>
<CAPTION>
                                                                  SHARES OF
                                                                 COMMON STOCK
NAME                                                          BENEFICIALLY OWNED    PERCENT OF CLASS
- ----                                                          ------------------    ----------------
<S>                                                           <C>                   <C>
John P. Frazee, Jr. ........................................     1,006,060(1)           *
Mark A. Knickrehm...........................................       166,000(2)           *
Scott D. Grimes.............................................        62,000(3)           *
William G. Scott............................................       113,368(4)           *
All directors and executive officers as a group (7
  persons)..................................................     1,406,628(5)             1.1%
</TABLE>

- ---------------
 *  Represents less than 1%

(1) Includes 882,900 shares subject to options.

(2) Includes 166,000 shares subject to options.

(3) Includes 62,000 shares subject to options.

(4) Includes 105,464 shares subject to options.

(5) Includes 1,273,364 shares subject to options.

                                       32
<PAGE>   373

                       DESCRIPTION OF VAST CAPITAL STOCK

     The following description summarizes some of the general terms and
provisions of our capital stock and our certificate of incorporation and bylaws.
This description is not complete and you should refer to our certificate of
incorporation and bylaws and to Delaware law for more information.

AUTHORIZED AND OUTSTANDING CAPITAL STOCK

     Our authorized capital stock consists of 50,000,000 shares of Class A
common stock, par value $0.01 per share, 50,000,000 shares of Class B common
stock, par value $0.01 per share and 25,000,000 shares of preferred stock, par
value $0.01 per share. Immediately following the Arch merger, approximately
3,900,000 shares of our Class A common stock and approximately 16,100,000 shares
of our Class B common stock will be outstanding. All of the Class A common stock
will be indirectly owned by Arch. No shares of our preferred stock are currently
outstanding.

COMMON STOCK

  Voting Rights

     The holders of Class A common stock and Class B common stock generally have
identical voting rights, with each holder entitled to one vote for each share of
common stock owned. Generally, matters to be voted on by stockholders, including
amendments to the certificate of incorporation, must be approved by a majority
vote of the holders of our common stock, voting together as a single class,
subject to any voting rights granted to holders of any preferred stock. However,
a majority vote of the affected class, voting separately, is also necessary for
amendments of the certificate of incorporation that would adversely affect the
rights of the Class A common stock or the Class B common stock. Any amendment to
the certificate of incorporation to increase the authorized shares of any class
of our capital stock requires the approval only of a majority of the votes
entitled to be cast by the holders of our common stock voting together as a
single class.

     Holders of shares of our common stock may not cumulate their votes in the
election of directors. In cumulative voting, a stockholder has a number of votes
equal to the number to which his stockholdings would entitle him, multiplied by
the number of directors being elected. A stockholder can then vote all of those
votes in favor of one or more directors. This improves a minority stockholder's
ability to influence the election of specific directors.

  Dividends

     All holders of our common stock will share equally on a per share basis in
any dividend declared by the board of directors, subject to any rights of any
outstanding preferred stock to receive dividends. If the board declares a stock
dividend, stockholders of each class of common stock must receive shares of the
class of stock they already hold. Additionally, all common stockholders must
receive the same number of dividend shares on a per share basis.

     We may not reclassify, subdivide or combine shares of either class of
common stock without simultaneously doing the same to shares of the other class.

  Redemption

     We may not redeem the Class A common stock.

     We have the option to redeem the Class B common stock, in whole or in part,
at any time following the sale by us of additional shares of Class A common
stock, or any shares of our capital stock that are convertible into shares of
Class A common stock, other than sales pursuant to employee benefit plans. The
redemption price for the Class B common stock will be equal to the sale price of
the Class A common stock, net of any discounts or commissions, or the price at
which such capital stock may be converted into Class A common stock. The number
of shares of Class B common stock which may be redeemed at any

                                       33
<PAGE>   374

time is limited to the maximum number that we can redeem at the applicable
redemption price using the proceeds from the sale of the Class A common stock or
the capital stock that is convertible into Class A common stock. In the case of
a redemption of less than all of the Class B common stock, we will redeem the
shares of Class B common stock on a pro rata basis.

     In order to exercise our optional redemption right with respect to the
Class B common stock, we must send a redemption notice to holders not more than
15 business days following the sale of shares of Class A common stock or the
capital stock that is convertible into Class A common stock. Such notice will
include the redemption date, which may not be more than 60 days or less than 30
days from the date the notice is sent, and the applicable redemption price.

  Conversion

     Holders of Class A common stock may not convert their shares into any other
securities.

     Each share of Class B common stock will automatically convert into one
share of Class A common stock upon the earlier of (i) the second anniversary of
the completion of the Arch merger or (ii) one year following the completion of
an underwritten public offering of common stock by us in which the net proceeds
of the offering exceeds $25 million.

  Other Rights

     If we merge or consolidate with another corporation and shares of our
common stock are converted into or exchangeable for shares of stock, other
securities or property, all holders of our common stock, regardless of class,
will be entitled to receive the same kind and amount of payment for their
shares. This requirement can be waived by a majority vote of each class of
holders of our common stock.

     If we are liquidated, dissolved or wound up, after full payment of required
amounts to preferred stockholders, if any, all holders of our common stock,
regardless of class, will receive the same amount per share of any assets
distributed to common stock holders.

     No shares of either class of common stock have any right to purchase
additional shares of common stock or other securities of ours.

     All outstanding shares of our common stock, including all shares of common
stock issued in the distribution and the exchange offer, are or will be, when
issued, validly issued, fully paid and nonassessable.

PREFERRED STOCK

     Our board of directors can issue shares of our preferred stock, in one or
more series, without stockholder approval. For each series of our preferred
stock, our board of directors can determine the powers, preferences, rights,
qualifications, limitations and restrictions, including the dividend rights,
conversion rights, voting rights, terms of redemption, liquidation preferences
and the number of shares in the series. As a result, our board of directors can
authorize and issue shares of preferred stock with voting or conversion rights
which may adversely affect the voting or other rights of holders of our common
stock. In addition, the issuance of preferred stock may delay or prevent a
transaction which would cause a change in our control, because the rights given
to the holders of a series of preferred stock may prohibit a merger,
reorganization, sale of all or substantially all of our assets, liquidation or
other extraordinary corporate transaction.

     For purposes of the rights plan described below, our board of directors
intends to designate 1.0 million shares of Series A junior participating
preferred stock, par value $.01 per share. For a description of the rights plan,
see "-- Rights Plan."

                                       34
<PAGE>   375

CLASSIFIED BOARD OF DIRECTORS

     Our certificate of incorporation will provide that our board of directors
may establish the number of our directors, provided that we must have at least
three directors and may not have more than 15. We intend to increase the size of
our board of directors to approximately seven directors before the closing of
the Arch merger. A majority of the remaining directors may fill any vacancy in
our board of directors, including a vacancy resulting from an increase in the
size of our board of directors. Our certificate of incorporation divides our
board of directors into three classes of directors, with approximately one-third
of our directors serving in each class. As the term of each class expires, the
directors elected to that class will hold office for three years, unless they
die or resign or are removed before that time. As a result, at least two annual
meetings of stockholders, instead of one, will generally be required to change a
majority of our directors. Also, our stockholders can only remove directors for
cause by the affirmative vote of the holders of 66 2/3% or more of the
outstanding shares of capital stock entitled to vote in the election of
directors.

     We believe that our classified board of directors and the inability of our
stockholders to remove directors without cause or to fill vacancies on our board
of directors will help ensure the continuity and stability of our business
strategy and policies from year to year. However, it also makes the removal of
incumbent directors more time-consuming and difficult. This may discourage third
parties from attempting to obtain control of our company, even if the change in
control would be in the best interests of our stockholders.

ADVANCE NOTICE OF DIRECTOR NOMINATIONS AND BUSINESS PROPOSALS

     We have adopted advance notice provisions in our bylaws which require our
stockholders to present their nominations for directors or other business
proposals for our annual meeting within a specified time frame. In general,
stockholders must deliver their notice of nominations or business proposals to
our Secretary not less than 60 days nor more than 90 days before the first
anniversary of the prior year's annual meeting of stockholders. Any nominations
must include all information relating to the nominated person which is required
to be disclosed in proxy statements under the Securities Act. Any business
proposals must include:

     - a brief description of the business proposal;

     - the reason for conducting that business at the annual meeting;

     - any material interest of the proposing stockholder in that business; and

     - the name, address and number of shares owned by the proposing
       stockholder.

     These requirements make the election of new directors not nominated by our
board of directors more time-consuming and difficult, which may discourage third
parties from attempting to obtain control of our company, even if the change in
control would be in the best interests of our stockholders.

SPECIAL MEETINGS

     Our certificate of incorporation and our bylaws provide that only the
chairman of the board or the board of directors may call special meetings of
stockholders and stockholders may not call special meetings. In addition, our
certificate of incorporation and our bylaws provide that stockholders may only
act at an annual or special meeting of stockholders and not by written consent.
No business other than that stated in the notice of such meeting may be
transacted at any special meeting.

AMENDMENT OF BYLAWS AND CERTIFICATE OF INCORPORATION

     Our certificate of incorporation requires the approval of 66 2/3% or more
of the outstanding shares of capital stock entitled to vote to amend our bylaws
or the provisions of our certificate of incorporation relating to the
classification and composition of our board of directors, stockholder action by
written consent and the right to call special meetings of stockholders. This
requirement may discourage third parties from attempting to obtain control of
our company.
                                       35
<PAGE>   376

RIGHTS PLAN

     Our board of directors intends to adopt a stockholder rights plan. Pursuant
to the rights plan, our board of directors will cause to be issued one preferred
share purchase right for each outstanding share of Class A common stock and
Class B common stock (the "Class A Rights" and "Class B Rights," respectively,
together, the "Rights"). Each Right, when exercisable, entitles the registered
holder to purchase from us one one-hundredth of a share of Series A junior
participating preferred stock, at a price of $               .00 per one
one-hundredth share (the "Purchase Price"), subject to adjustment. The
description and terms of the Rights are set forth in a Rights Agreement between
Vast and                , as Rights Agent. The description set forth below is
intended as a summary only and is qualified in its entirety by reference to the
form of Rights Agreement which will be filed as an exhibit to the registration
statement of which this prospectus is a part. See "Where You Can Find More
Information."

     Until the earlier to occur of (i) 10 days following a public announcement
that a person or group of affiliated or associated persons (an "Acquiring
Person") has acquired, or obtained the right to acquire, beneficial ownership of
any combination of Class A common stock or Class B common stock representing 15%
or more of the votes of all shares entitled to vote in the election of directors
(the "Shares Acquisition Date") or (ii) 15 business days (or such later date as
may be determined by action of our board of directors prior to the time that any
person becomes an Acquiring Person) following the commencement of (or a public
announcement of an intention to make) a tender or exchange offer if, upon
consummation thereof, such person or group would be a beneficial owner of any
combination of Class A common stock or Class B common stock representing 15% or
more of the votes of all shares entitled to vote in the election of directors
(the earlier of such dates being called the "Distribution Date"), the Rights
will be evidenced by the common stock certificates together with a copy of the
summary of the rights plan and not by separate certificates.

     The Rights Agreement also provides that, until the Distribution Date, the
Rights will be transferred with and only with the respective Class A common
stock or Class B common stock. Until the Distribution Date (or earlier
redemption, expiration or termination of the Rights), the transfer of any
certificates for Class A common stock or Class B common stock will also
constitute the transfer of the Rights associated with such common stock
represented by such certificates.

     The Rights are not exercisable until the Distribution Date and will expire
on                            , 2010 (the "Final Expiration Date"), unless the
Rights are earlier redeemed.

     In the event that any person becomes an Acquiring Person, each holder of a
Class A Right and Class B Right will thereafter have the right to receive, upon
exercise at the then current exercise price of the Right, Class A common stock
and Class B common stock, respectively (or, in certain circumstances, cash,
property or other securities of Vast) having a value equal to two times the
exercise price of the Right. The Rights Agreement contains an exemption for any
issuance of Class A common stock or Class B common stock by us directly to any
person (for example, in a private placement or an acquisition by us in which
Class A common stock or Class B common stock is used as consideration), even if
that person would become the beneficial owner meeting the requirements set forth
in the second paragraph of this summary of the rights plan, provided that such
person does not acquire any additional shares of common stock.

     In the event that, at any time following the Shares Acquisition Date, we
are acquired in a merger or other business combination transaction or 50% or
more of our assets or earning power are sold, proper provision will be made so
that each holder of a Right will thereafter have the right to receive, upon
exercise at the then current exercise price of the Right, common stock of the
acquiring or surviving company having a value equal to two times the exercise
price of the Right.

     Notwithstanding the foregoing, following the occurrence of any of the
events set forth in the preceding two paragraphs, any Rights that are, or (under
certain circumstances specified in the Rights Agreement) were, beneficially
owned by any Acquiring Person will immediately become null and void.

                                       36
<PAGE>   377

     At any time after the date of the Rights Agreement until the time that a
person becomes an Acquiring Person, our board of directors may redeem the
Rights, at a price of $0.01 per Right.

     Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of Vast, including, without limitation, the right to
vote or to receive dividends.

     The Rights have certain anti-takeover effects. The Rights will cause
substantial dilution to a person or group that attempts to acquire us without
conditioning the offer on the Rights being redeemed or a substantial number of
Rights being acquired, and under certain circumstances the Rights beneficially
owned by such a person or group may become void. The Rights should not interfere
with any merger or other business combination approved by our board of directors
because, if the Rights would become exercisable as a result of such merger or
business combination, our board of directors may, at its option, at any time
prior to the time that any Person becomes an Acquiring Person, redeem all (but
not less than all) of the then outstanding Rights at the redemption price.

DELAWARE BUSINESS COMBINATION STATUTE

     We are organized under Delaware law. Some provisions of Delaware law may
delay or prevent a transaction which would cause a change in our control. In
addition, our certificate of incorporation contains some provisions which may
delay or prevent this type of transaction, even if our stockholders consider the
transaction to be in their best interests.

     After the merger, we will be subject to Delaware's anti-takeover laws.
Delaware law prohibits a publicly held corporation from engaging in a "business
combination" with an "interested stockholder" for three years after the
stockholder becomes an interested stockholder, unless the corporation's board of
directors and stockholders approve the business combination in a prescribed
manner. Generally, an "interested stockholder" is a person who directly or
indirectly owns 15% or more of the corporation's outstanding voting stock. A
"business combination" includes a merger, asset sale or other transaction which
results in a financial benefit to the interested stockholder. Delaware law does
not prohibit these business combinations if:

          (1) the corporation's board approves either the business combination
     or the transaction which results in the stockholder becoming an interested
     stockholder, before the stockholder becomes an interested stockholder;

          (2) after the transaction which results in the stockholder becoming an
     interested stockholder, the interested stockholder owns at least 85% of the
     corporation's outstanding stock; or

          (3) the corporation's board approves the business combination and the
     holders of at least two-thirds of the corporation's outstanding voting
     stock which the interested stockholder does not own, authorize the business
     combination.

     Although following the Arch merger Arch will indirectly own all of the
Class A common stock, which will constitute approximately 19.5% of all of our
outstanding common stock, Arch will not be an "interested stockholder."

LIMITATIONS ON LIABILITY AND INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Our certificate of incorporation provides that our directors will not be
personally liable to us or our stockholders for monetary damages for breach of
fiduciary duty as a director, except for:

          (1) any breach of the director's duty of loyalty to us or our
     stockholders;

          (2) misconduct or a knowing violation of law;

          (3) liability under Delaware corporate law for an unlawful payment of
     dividends or an unlawful stock purchase or redemption of stock; or

          (4) any transaction from which the director derives an improper
     personal benefit;

                                       37
<PAGE>   378

     Our certificate of incorporation and bylaws require us to indemnify and
advance expenses to our directors and officers to the fullest extent permitted
by Delaware law. Our certificate of incorporation and bylaws also permit us to
indemnify and advance expenses to our employees and agents if our board of
directors approves it.

TRANSFER AGENT AND REGISTRAR

     The transfer agent and registrar for our common stock is                .
Its address is                and its telephone number at this location is
          .

                                       38
<PAGE>   379

                        SHARES ELIGIBLE FOR FUTURE SALE

     Upon completion of the exchange offer with PageNet noteholders, and the
distribution to PageNet stockholders, we will have 3,900,000 million shares of
Class A common stock and 16,100,000 million shares of Class B common stock
outstanding, without taking into account any outstanding options or options
which may be granted in the future. Of these shares, the shares of Class B
common stock offered by this prospectus will be freely tradeable without
restriction or further registration under the Securities Act of 1933 (the
"Securities Act"), unless they are sold by persons deemed to be "affiliates" of
Vast as that term is defined in Rule 144 under the Securities Act. Shares
acquired by our affiliates may generally be sold in compliance with the
requirements of Rule 144.

     Although the shares of Class B common stock held by persons who are not our
affiliates will be freely tradeable under the Securities Act, we do not intend
to apply for listing of our Class B common stock on any securities exchange, or
for quotation through any quotation system. Accordingly, a liquid trading market
for the Class B common stock is not likely to develop. See "Risk Factors -- A
liquid trading market for our Class B common stock likely will not develop and
the market price of our Class B common stock could be adversely affected."

     The 3,900,000 million shares of Class A common stock that will be owned
indirectly by Arch will be "restricted" securities within the meaning of Rule
144 under the Securities Act and may not be sold in the absence of registration
under the Securities Act or unless an exemption from registration is available,
including the exemption contained in Rule 144 under the Securities Act.

     In general, under Rule 144, a stockholder who has owned Class A or Class B
common stock for at least one year may, within any three-month period, sell up
to the greater of:

     - 1% of the total number of shares of the applicable class of common stock
       then outstanding; and

     - the average weekly trading volume of the applicable class of common stock
       on the national securities exchange and/or automated quotation system on
       which the common stock is traded during the four weeks before the person
       files a notice on Form 144 of that sale.

     Sales of shares under Rule 144 are also subject to manner of sale and
notice requirements and requirements as to the availability of current public
information about us. Under Rule 144, a stockholder who has not been an
affiliate of Vast for at least 90 days and who has beneficially owned shares of
common stock for at least two years may sell those shares without complying with
the volume limitations or other requirements of Rule 144.

     At the closing of the merger, options to purchase approximately
               shares of our Class A common stock will be outstanding. After the
merger, we plan to file a registration statement on Form S-8 under the
Securities Act covering             shares of Class A common stock which are
reserved for issuance under the Vast long term stock incentive plan. This
registration statement will become effective automatically upon filing. Shares
of Class A common stock registered under this registration statement will be
available for sale in the open market, subject to vesting restrictions. Any
sales of these shares will be subject to the volume limitations of Rule 144
described above if sold by affiliates.

     Prior to the exchange offer and distribution, there has been no market for
our Class B common stock, and no precise predictions can be made of the effect,
if any, that market sales of shares or the availability of shares for sale will
have on the market price prevailing from time to time. Nevertheless, sales of
substantial amounts of our common stock in the public market, or the possibility
of those sales, may have an adverse effect on the market price of our common
stock and may make it more difficult for us to raise capital by issuing
additional common stock. See "Risk Factors -- Availability of significant
amounts of common stock for sale in the future could adversely affect the price
of your Class B common stock and sales by us of additional shares of common
stock would dilute your ownership interest."

                                       39
<PAGE>   380

                                 LEGAL MATTERS

     The validity of the shares of Class B common stock being offered hereby
will be passed upon for us by Mayer, Brown & Platt, Chicago, Illinois.

                                    EXPERTS

     The financial statements of Vast Solutions, Inc. as of December 31, 1998
and September 30, 1999, and for the period September 1, 1998 (inception) through
December 31, 1998, the nine months ended September 30, 1999, and the period
September 1, 1998 (inception) through September 30, 1999, appearing in this
prospectus have been audited by Ernst & Young LLP, independent auditors, as set
forth in their report thereon (which contains an explanatory paragraph
describing the conditions that raise substantial doubt about the ability of Vast
Solutions, Inc. to continue as a going concern as described in Note 1 to the
financial statements) appearing elsewhere herein, and are included in reliance
upon such report given on the authority of such firm as experts in accounting
and auditing.

     The financial statements of Silverlake Communications, Inc. as of December
31, 1997 and December 9, 1998, and for the year ended December 31, 1997 and the
period January 1, 1998 through December 9, 1998, appearing in this prospectus
have been audited by Ernst & Young LLP, independent auditors, as set forth in
their report thereon appearing elsewhere herein, and are included in reliance
upon such report given on the authority of such firm as experts in accounting
and auditing.

                      WHERE YOU CAN FIND MORE INFORMATION

     We have filed with the Securities and Exchange Commission a registration
statement on Form S-1 under the Securities Act with respect to the shares of
Class B common stock offered by this prospectus. This prospectus does not
contain all of the information set forth in the registration statement and the
exhibits and schedules thereto. For further information with respect to us and
our Class B common stock offered by this prospectus, reference is made to the
registration statement and the exhibits and schedules filed with the
registration statement. Statements contained in this prospectus as to the
contents of any contract or any other document referred to are not necessarily
complete, and in each instance reference is made to the copy of such contract or
other document filed as an exhibit to the registration statement, each such
statement being qualified in all respects by such reference. A copy of the
registration statement may be inspected without charge at the Securities and
Exchange Commission's public reference facilities in Washington, D.C., New York,
New York or Chicago, Illinois. You may also copy any document we file with the
Securities and Exchange Commission at prescribed rates by writing to the Public
Reference Section of the Securities and Exchange Commission at 450 Fifth Street,
N.W., Washington, D.C. 20549. Please call the Securities and Exchange Commission
at 1-800-SEC-0330 for further information on the operation of the public
reference facilities. The Securities and Exchange Commission maintains a Web
site (http://www.sec.gov) that contains reports, proxy and information
statements and other information regarding registrants, such as Vast, that file
electronically with the Securities and Exchange Commission.

                                       40
<PAGE>   381

                         INDEX TO FINANCIAL STATEMENTS

VAST SOLUTIONS, INC.

<TABLE>
<S>                                                           <C>
Report of Independent Auditors..............................   FF-2
Balance Sheets as of December 31, 1998 and September 30,
  1999......................................................   FF-3
Statements of Operations for the period September 1, 1998
  (inception) through December 31, 1998, the nine months
  ended September 30, 1999, and the period September 1, 1998
  (inception) through September 30, 1999....................   FF-4
Statements of Stockholder's Deficit for the period September
  1, 1998 (inception) through December 31, 1998, the nine
  months ended September 30, 1999, and the period September
  1, 1998 (inception) through September 30, 1999............   FF-5
Statements of Cash Flows for the period September 1, 1998
  (inception) through December 31, 1998 and the nine months
  ended September 30, 1999..................................   FF-6
Notes to Financial Statements...............................   FF-7
</TABLE>

SILVERLAKE COMMUNICATIONS, INC.

<TABLE>
<S>                                                           <C>
Report of Independent Auditors..............................  FF-15
Balance Sheets as of December 9, 1998 and December 31,
1997........................................................  FF-16
Statements of Operations for the year ended December 31,
  1997 and the period ended December 9, 1998................  FF-17
Statements of Stockholders' Equity for the year ended
  December 31, 1997 and the period ended December 9, 1998...  FF-18
Statements of Cash Flows for the year ended December 31,
  1997 and the period ended December 9, 1998................  FF-19
Notes to Financial Statements...............................  FF-20
</TABLE>

                                      FF-1
<PAGE>   382

                         REPORT OF INDEPENDENT AUDITORS

The Board of Directors and Stockholder
Vast Solutions, Inc.

     We have audited the accompanying balance sheets of Vast Solutions, Inc.
(the Company), a company in the development stage and a wholly-owned subsidiary
of Paging Network, Inc., as of December 31, 1998 and September 30, 1999, and the
related statements of operations, stockholder's deficit, and cash flows for the
period September 1, 1998 (inception) through December 31, 1998, the nine months
ended September 30, 1999 and the period September 1, 1998 (inception) through
September 30, 1999. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.

     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Vast Solutions, Inc. as of
December 31, 1998 and September 30, 1999, and the results of its operations and
its cash flows for the period September 1, 1998 (inception) through December 31,
1998, the nine months ended September 30, 1999, and the period September 30,
1998 (inception) through September 30, 1999 in conformity with generally
accepted accounting principles.

     The accompanying financial statements have been prepared assuming that the
Company will continue as a going concern. The Company has accumulated losses of
$26.7 million since its inception and has negative working capital of $29.0
million as of September 30, 1999. As more fully described in Note 1, the Company
may not have sufficient liquidity to meet its obligations or fund its operations
through the second quarter of 2000. The Company currently does not have any
available borrowing facilities and does not anticipate any additional financing
from its parent company, Paging Network, Inc. Furthermore, the financial
position of its parent company makes it difficult for the Company to obtain
separate debt or equity financing prior to the planned spinoff of the Company by
its parent as part of a larger transaction, the completion of which is subject
to various approvals and consents and not expected to occur until the second
quarter of 2000. These events raise substantial doubt about the Company's
ability to continue as a going concern. Management's plans in regard to these
matters are also described in Note 1. The accompanying financial statements do
not include any adjustments to reflect the possible future effects on the
recoverability and classification of assets or the amounts and classification of
liabilities that may result from the outcome of these uncertainties.

                                                      ERNST & YOUNG LLP

Dallas, Texas
              , 2000

     The foregoing report is in the form that will be signed upon the transfer
of certain intellectual and other property by Paging Network, Inc. to Vast
Solutions, Inc. as described in Note 1 to the financial statements.

                                                       /s/ ERNST & YOUNG LLP

Dallas, Texas
January 5, 2000

                                      FF-2
<PAGE>   383

                              VAST SOLUTIONS, INC.
                      (A COMPANY IN THE DEVELOPMENT STAGE)

                                 BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                DECEMBER 31,    SEPTEMBER 30,
                                                                    1998            1999
                                                                ------------    -------------
<S>                                                             <C>             <C>
ASSETS
Current assets:
  Cash and cash equivalents.................................     $   42,706     $ 30,347,093
  Accounts receivable.......................................        108,688           71,365
  Accounts receivable from PageNet..........................         56,232           30,894
  Prepaid expenses and other current assets.................         12,484           15,253
                                                                 ----------     ------------
Total current assets........................................        220,110       30,464,605
Property and equipment:
  Computer equipment........................................        100,006          614,683
  Furniture and fixtures....................................         21,970          565,098
  Leasehold improvements....................................             --          134,525
  Other property and equipment..............................             --           88,486
  Accumulated depreciation..................................         (9,487)        (484,775)
                                                                 ----------     ------------
Total property and equipment................................        112,489          918,017
Other non-current assets:
  Goodwill..................................................      1,135,039        1,135,039
  Software development costs................................        727,600          727,600
  Other intangible assets...................................        217,500          217,500
  Accumulated amortization..................................        (57,053)        (462,744)
                                                                 ----------     ------------
Total other non-current assets..............................      2,023,086        1,617,395
                                                                 ----------     ------------
Total assets................................................     $2,355,685     $ 33,000,017
                                                                 ==========     ============
LIABILITIES AND STOCKHOLDER'S DEFICIT
Current liabilities:
  Accounts payable..........................................     $    2,113     $      6,138
  Accrued compensation......................................             --          375,286
  Other accrued liabilities.................................         15,085           84,899
  Amounts due PageNet.......................................      6,302,220       28,715,177
  Deferred revenue..........................................             --          271,549
  Note payable to PageNet...................................             --       30,000,000
                                                                 ----------     ------------
Total current liabilities...................................      6,319,418       59,453,049
Commitments and contingencies

Stockholder's deficit:
  Preferred stock ($.01 par value; 25,000,000 shares
     authorized; no shares issued or outstanding)...........             --               --
  Common stock ($.01 par value; 50,000,000 shares
     authorized; 20,000,000 shares issued and
     outstanding)...........................................        200,000          200,000
  Deficit accumulated during the development stage..........     (4,163,733)     (26,653,032)
                                                                 ----------     ------------
Total stockholder's deficit.................................     (3,963,733)     (26,453,032)
                                                                 ----------     ------------
Total liabilities and stockholder's deficit.................     $2,355,685     $ 33,000,017
                                                                 ==========     ============
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                      FF-3
<PAGE>   384

                              VAST SOLUTIONS, INC.
                      (A COMPANY IN THE DEVELOPMENT STAGE)

                            STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                                                    CUMULATIVE FROM
                                                  SEPTEMBER 1                      SEPTEMBER 1, 1998
                                                  (INCEPTION)      NINE MONTHS        (INCEPTION)
                                                    THROUGH           ENDED             THROUGH
                                                  DECEMBER 31,    SEPTEMBER 30,      SEPTEMBER 30,
                                                      1998            1999               1999
                                                  ------------    -------------    -----------------
<S>                                               <C>             <C>              <C>
Revenues:
  External customers..........................    $    43,563     $    743,638       $    787,201
  PageNet.....................................         46,472           65,660            112,132
                                                  -----------     ------------       ------------
Total revenues................................         90,035          809,298            899,333
Operating costs and expenses:
  Costs of revenues...........................         23,963          314,350            338,313
  Selling, general and administrative
     expenses.................................      2,204,673       10,744,115         12,948,788
  Research and development activities.........        340,013        2,975,043          3,315,056
  Allocated research and overhead expenses....      1,442,000        8,291,000          9,733,000
  Purchased in-process research and
     development..............................        152,500               --            152,500
                                                  -----------     ------------       ------------
Total operating costs and expenses............      4,163,149       22,324,508         26,487,657
                                                  -----------     ------------       ------------
Loss from operations..........................     (4,073,114)     (21,515,210)       (25,588,324)
Other income (expense):
  Interest expense on amounts due PageNet.....        (90,621)        (971,251)        (1,061,872)
  Other income (expense)......................              2           (2,838)            (2,836)
                                                  -----------     ------------       ------------
Net loss......................................    $(4,163,733)    $(22,489,299)      $(26,653,032)
                                                  ===========     ============       ============
Loss per common share -- basic and diluted....    $     (0.21)    $      (1.12)
                                                  ===========     ============
Weighted averaged number of common shares
  outstanding.................................     20,000,000       20,000,000
                                                  ===========     ============
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                      FF-4
<PAGE>   385

                              VAST SOLUTIONS, INC.
                      (A COMPANY IN THE DEVELOPMENT STAGE)

                      STATEMENTS OF STOCKHOLDER'S DEFICIT

<TABLE>
<CAPTION>
                                                                    DEFICIT
                                                                  ACCUMULATED
                                                                   DURING THE         TOTAL
                                                       COMMON     DEVELOPMENT     STOCKHOLDER'S
                                                       STOCK         STAGE           DEFICIT
                                                      --------    ------------    -------------
<S>                                                   <C>         <C>             <C>
Balance at September 1, 1998 (inception)............  $200,000    $         --    $    200,000
  Net loss..........................................        --      (4,163,733)     (4,163,733)
                                                      --------    ------------    ------------

Balance at December 31, 1998........................   200,000      (4,163,733)     (3,963,733)
  Net loss..........................................        --     (22,489,299)    (22,489,299)
                                                      --------    ------------    ------------
Balance at September 30, 1999.......................  $200,000    $(26,653,032)   $(26,453,032)
                                                      ========    ============    ============
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                      FF-5
<PAGE>   386

                              VAST SOLUTIONS, INC.
                      (A COMPANY IN THE DEVELOPMENT STAGE)

                            STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                 SEPTEMBER 1                       CUMULATIVE FROM
                                                 (INCEPTION)      NINE MONTHS     SEPTEMBER 1, 1998
                                                   THROUGH           ENDED           (INCEPTION)
                                                 DECEMBER 31,    SEPTEMBER 30,         THROUGH
                                                     1998            1999         SEPTEMBER 30, 1999
                                                 ------------    -------------    ------------------
<S>                                              <C>             <C>              <C>
OPERATING ACTIVITIES:
Net loss.....................................    $(4,163,733)    $(22,489,299)       $(26,653,032)
Adjustments to reconcile net loss to net cash
  used in operating activities:
  Depreciation...............................          9,487          475,288             484,775
  Amortization...............................         57,053          405,691             462,744
  Provision for doubtful accounts............             --           25,000              25,000
  Purchased in-process research and
     development.............................        152,500               --             152,500
  Changes in operating assets and
     liabilities:
     Accounts receivable.....................        (68,934)          37,661             (31,273)
     Prepaid expenses and other current
       assets................................          2,037           (2,769)               (732)
     Accounts payable and accrued
       liabilities...........................        (28,745)         449,125             420,380
     Deferred revenue........................             --          271,549             271,549
                                                 -----------     ------------        ------------
Net cash used in operating activities........     (4,040,335)     (20,827,754)        (24,868,089)

INVESTING ACTIVITIES:
Capital expenditures.........................        (79,291)      (1,280,816)         (1,360,107)
Acquisition of Silverlake Communications,
  Inc., net of cash acquired.................     (2,339,888)              --          (2,339,888)
                                                 -----------     ------------        ------------
Net cash used in investing activities........     (2,419,179)      (1,280,816)         (3,699,995)

FINANCING ACTIVITIES:
Proceeds from note payable to PageNet........             --       30,000,000          30,000,000
Increase in amounts due to PageNet...........      6,502,220       22,412,957          28,915,177
                                                 -----------     ------------        ------------
Net cash provided by investing activities....      6,502,220       52,412,957          58,915,177
                                                 -----------     ------------        ------------
Net increase in cash and cash equivalents....         42,706       30,304,387          30,347,093
Cash and cash equivalents at beginning of
  period.....................................             --           42,706                  --
                                                 -----------     ------------        ------------
Cash and cash equivalents at end of period...    $    42,706     $ 30,347,093        $ 30,347,093
                                                 ===========     ============        ============

SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest during the period.....    $    90,621     $    971,251        $  1,061,872
Cash paid for taxes during the period........             --               --                  --
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                      FF-6
<PAGE>   387

                              VAST SOLUTIONS, INC.

                         NOTES TO FINANCIAL STATEMENTS

1.   THE COMPANY AND BASIS OF PRESENTATION

     Vast Solutions, Inc. (the Company) was formed in September 1998 by its
     parent company, Paging Network, Inc. (PageNet), to develop three principal
     businesses: (1) wireless information services, (2) customized wireless
     solutions for business customers, and (3) wireless Internet gateway
     services. The Company initially operated as a division of PageNet and had
     no separate legal status or existence. On December 9, 1998, PageNet
     acquired Silverlake Communications, Inc. (Silverlake) for a total purchase
     price of approximately $2.4 million, comprised of cash consideration of
     $1.75 million and 100,000 shares of common stock of PageNet (the
     Acquisition). The Acquisition, additional terms of which are discussed in
     Note 4, was carried out by PageNet to provide additional in-house software
     development capabilities for the Company. On June 22, 1999, PageNet
     publicly announced the organization of the Company as an operating unit to
     be known as Vast Solutions to focus on the emerging market for wireless
     information services. PageNet further announced that the Company would
     include several parts of PageNet's then current organization; however, the
     Company continued to operate as a division of PageNet following the June
     1999 announcement. During the third quarter of 1999, PageNet determined
     that the optimal structure for the Company would be for its operations to
     be combined with those of Silverlake, which had remained a separate
     subsidiary of PageNet following the Acquisition, as the activities of
     Silverlake related directly to the operations of the Company. On September
     13, 1999, the board of directors of PageNet authorized (i.) a capital
     investment of $30 million in Silverlake, and (ii.) the operation of the
     activities of the Company within Silverlake. On December 29, 1999,
     Silverlake merged into a wholly-owned subsidiary of Silverlake, Vast
     Solutions, Inc., primarily to change the Company's state of incorporation
     from California to Delaware.

     On November 8, 1999, PageNet and Arch Communications Group, Inc. (Arch)
     announced a merger agreement under which the common stock and public
     indebtedness of PageNet will be exchanged for Arch common stock (the
     Arch-PageNet Merger). Under the terms of the Arch-PageNet Merger, holders
     of PageNet's public indebtedness will receive up to a 68.9% direct interest
     in the Company, while holders of PageNet's common stock will receive up to
     a 11.6% direct interest (the Spinoff). The remaining 19.5% interest will be
     held by Arch following the Arch-PageNet Merger. Consummation of the
     Arch-PageNet Merger is subject to the approval of the shareholders of Arch
     and PageNet, completion of a recapitalization of Arch and PageNet,
     customary regulatory review, and certain third-party consents. Arch and
     PageNet anticipate the Arch-PageNet Merger will be completed during the
     first half of 2000.

     On                  , 2000, PageNet transferred to the Company the rights
     to certain hardware, proprietary software technology and licensed software
     technology which together comprise the Company's Gateway.

     The Company is in the development stage, and, since inception, has been
     engaged primarily in product research and development and developing
     markets for its products and services. The Company has had minimal revenues
     from operations and in the course of its start-up activities has sustained
     significant operating losses. The Company does not expect to generate
     significant revenues until such time as it successfully completes its
     development and marketing activities. Subsequent to the Acquisition, the
     Company's revenues have been derived primarily from the sale of software
     from Silverlake's Airsource suite of products. However, the Company's
     primary operations in the future will be comprised of the following
     integrated wireless solutions:

     -  The Gateway.  The Company will provide solutions enabled through its
        expandable software platform (the Gateway), which allows the Company to
        deliver data services across multiple network technologies. Through the
        Gateway, the Company will provide a single, transparent bridge between
        the Internet and corporate data networks and wireless devices, managing
        the complexities

                                      FF-7
<PAGE>   388

       associated with wireless networks, protocols, and data management. The
       Company's Gateway technology consists of network servers running
       proprietary software. The Gateway manages the differences between
       individual networks and devices, providing a single, standard interface
       to the corporate enterprise. The Gateway adapts and translates data
       transmissions for many wireless network protocols, formats the
       transmissions for particular user devices and optimizes the data in a
       bandwidth efficient manner for transmission over a wireless network. The
       Gateway also facilitates wireless extensions of corporate e-mail
       applications and the delivery of personalized wireless content, such as
       news and sports.

     -  Wireless Software System Design and Development.  The Company is
        designing and developing software to allow corporations and enterprise
        application providers to extend Internet and corporate enterprise
        applications to most available wireless devices. The Company will
        develop, implement, support, and manage wireless software applications
        for use on multiple device platforms.

     -  Wireless Device Development and Integration.  The Company is designing
        and developing custom wireless devices for unique telemetry applications
        that connect a business to its remote assets, such as vending machines,
        automobiles and storage tanks. These devices are integrated with
        commercially available wireless modems designed for the appropriate
        network technology.

     -  Internet-based Provisioning and Customer Support.  The Company will
        offer a privately branded web-portal that allows users to order wireless
        devices and contact customer support over the Internet. This web-based
        support model includes credit card billing, e-mail customer support,
        on-line training and software downloads. The Company also will operate a
        customer support center to manage all operational components of their
        wireless solution including distribution, coverage, billing and
        technical support.

     The accompanying financial statements have been prepared assuming that the
     Company will continue as a going concern. The Company has accumulated
     losses of $26.7 million since its inception and has negative working
     capital of $29.0 million as of September 30, 1999. As of December 31, 1999,
     the Company had approximately $9.6 million in cash, which the Company
     believes is sufficient to meet its obligations through the first quarter of
     2000. However, the Company may not have sufficient liquidity to meet its
     obligations or fund its development and operating activities through the
     second quarter of 2000. The Company is currently involved in discussions
     with third parties regarding potential private equity investments in the
     Company, which, if consummated, the Company would expect to close
     simultaneously with the Spinoff. However, there can be no assurance that
     the Company's efforts to obtain such an equity investment will prove
     successful or that the Company will have adequate liquidity to meet its
     obligations through the date of the Spinoff. Furthermore, the Company does
     not anticipate additional financing from PageNet, which is currently
     precluded by the terms of its public indebtedness from further borrowings
     under its domestic credit facility. PageNet is also currently exploring
     certain strategic and financing alternatives to ensure its continued
     liquidity through the consummation of the Arch-PageNet Merger. If such
     efforts of PageNet prove untimely or unsuccessful, or if the Arch-PageNet
     Merger is not completed, PageNet may be required to reduce the level of its
     operations and/or file for protection under Chapter 11 of the United States
     Bankruptcy Code to restructure its obligations. These events would preclude
     any further investments in the Company by PageNet and negatively impact the
     Company's operations. The possibility of the occurrence of these events
     also makes it more difficult for the Company to obtain separate debt or
     equity financing prior to the Spinoff. These events raise substantial doubt
     about the Company's ability to continue as a going concern. The
     accompanying financial statements do not include any adjustments to reflect
     the possible future effects on the recoverability and classification of
     assets or the amounts and classification of liabilities that may result
     from the outcome of these uncertainties.

                                      FF-8
<PAGE>   389

2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     GENERAL

     The accompanying financial statements have been prepared using PageNet's
     historical basis in the assets and liabilities of the Company. The
     financial statements reflect the results of operations, financial condition
     and cash flows of the Company as a component of PageNet and may not be
     indicative of the Company's results of operations and financial position as
     a separate, stand-alone entity. Management believes the accompanying
     financial statements include a reasonable allocation of administrative
     costs, which are described in Note 3, incurred by PageNet on behalf of the
     Company.

     USE OF ESTIMATES

     The preparation of financial statements in conformity with generally
     accepted accounting principles requires management to make estimates and
     assumptions that affect the amounts reported in the financial statements
     and accompanying notes. Actual results could differ from those estimates.

     REVENUE RECOGNITION

     Revenues since the Company's inception have been derived primarily from the
     sale of Airsource software licenses. The Company has also generated
     revenues from sales of wireless communication devices; however, revenues
     from such sales have been insignificant since the Company's inception.

     Revenue for software sales is recognized in accordance with the provisions
     of American Institute of Certified Public Accountants' Statement of
     Position (SOP) 97-2, Software Revenue Recognition. Under SOP 97-2, software
     sales are recognized upon execution of a contract and delivery of software,
     provided that the license fee is fixed and determinable, no significant
     production, modification or customization of the software is required, and
     collection is considered probable by management. The Company provides
     telephone customer and technical support and software upgrades as an
     accommodation to purchasers of its products as a means of fostering
     customer satisfaction. The majority of such services are provided during
     the first 30 days of ownership of the Company's products. The costs
     associated with these services, which are insignificant in relation to
     product sales value, are accrued.

     Revenue for providing content services is recognized in the month the
     service is performed. Sales of wireless communication devices are
     recognized upon delivery to the customer. Revenue for custom development
     services is recognized as services are performed and after obtaining an
     executed contract from the customer. Custom development revenues derived
     from fixed-fee contracts are recognized on the percentage-of-completion
     method based on costs incurred in relation to total estimated costs.
     Anticipated contract losses are recognized when they can be estimated.
     Revenue for time-and-materials contracts is recognized as services are
     performed.

     CASH AND CASH EQUIVALENTS

     The Company considers all highly liquid investments with maturities of
     three months or less when purchased to be cash equivalents. Cash and cash
     equivalents consists primarily of depository and money market accounts.

     PROPERTY AND EQUIPMENT

     Property and equipment is stated at original cost less accumulated
     depreciation. Property and equipment transferred from PageNet is recorded
     at PageNet's net book value on the date of the transfer. Expenditures for
     normal maintenance and repairs are charged to expense as incurred.

     Depreciation of property and equipment is computed using the straight-line
     method over the estimated lives of the assets which range from five to
     seven years. Property and equipment transferred from PageNet is depreciated
     over the remainder of its original estimated useful life.

                                      FF-9
<PAGE>   390

     INTANGIBLE ASSETS

     All intangible assets were recorded upon the acquisition of Silverlake by
     the Company in December 1998. The acquisition of Silverlake is discussed in
     Note 4. Intangible assets are amortized on a straight-line basis over the
     following lives:

<TABLE>
    <S>                                                       <C>
    Goodwill..............................................    5 years
    Software development costs............................    3 years
    Other intangible assets...............................    3 years
</TABLE>

     Other intangible assets consist of the value of Silverlake's trademarks and
     workforce as of the date of the Acquisition.

     DEFERRED REVENUE

     Deferred revenue represents amounts billed to customers under terms
     specified in consulting, software licensing, and maintenance contracts for
     which completion of contractual terms or delivery of the software has not
     occurred.

     RESEARCH AND DEVELOPMENT COSTS

     Research and product development costs, which are not subject to Statement
     of Financial Accounting Standards No. 86, Accounting for the Cost of
     Computer Software to be Sold, Leased, or Otherwise Marketed, are expensed
     as incurred and relate mainly to the development of new products and the
     ongoing maintenance of existing products. Software development costs are
     expensed as incurred until technological feasibility has been established,
     at which time such costs are capitalized until the point at which the
     product is available for general release to customers. Since the Company's
     inception, the establishment of technological feasibility of the Company's
     products and general release of such software have substantially coincided.
     As a result, software development costs qualifying for capitalization have
     been insignificant and, therefore, the Company has historically expensed
     all software development costs.

     EMPLOYEE STOCK OPTIONS

     The Company accounts for its stock-based compensation plans in accordance
     with Accounting Principles Board Opinion No. 25, Accounting for Stock
     Issued to Employees, and related Interpretations. No compensation expense
     was recognized for any period presented for stock option grants since the
     exercise price of PageNet's stock option grants to personnel of the Company
     was equal to the fair market value of the underlying stock on the date of
     grant.

3.   RELATED PARTY TRANSACTIONS

     As a result of its relationship with PageNet and its affiliates, the
     Company has extensive related party transactions. These transactions have
     been recognized on a basis determined by the parties, which may not be
     representative of the terms the Company might have negotiated with third
     parties.

     Revenues from PageNet consist of sales of software from the Company's
     Airsource product line to PageNet. Sales to PageNet are typically made on
     terms and conditions similar to those of transactions with non-affiliates.

     Research and overhead expenses are charged to the Company by PageNet to
     cover information technology support, management services, human resources
     management, and other administrative services based on employee headcount
     or estimated usage of such services. Management of PageNet and the Company
     believe such amounts are a reasonable allocation of the costs incurred by
     PageNet on behalf of the Company. However, such amounts may not be
     indicative of the costs the Company would incur if such services were
     performed internally or obtained from an independent third party.

                                      FF-10
<PAGE>   391

     Expenses charged to the Company by PageNet are as follows:

<TABLE>
<CAPTION>
                                                                    SEPTEMBER 1
                                                                    (INCEPTION)      NINE MONTHS
                                                                      THROUGH           ENDED
                                                                    DECEMBER 31,    SEPTEMBER 30,
                                                                        1998            1999
                                                                    ------------    -------------
    <S>                                                             <C>             <C>
    Information technology support..............................     $  114,800      $3,894,000
    Management services.........................................      1,232,000       2,891,000
    Human resources management..................................         11,100         424,000
    Other general and administrative costs......................         84,100       1,082,000
                                                                     ----------      ----------
      Total allocated expenses..................................     $1,442,000      $8,291,000
                                                                     ==========      ==========
</TABLE>

     In connection with the Spinoff, the Company will enter into various
     agreements with PageNet and Arch for certain of the services described
     above. Certain of the services currently provided by PageNet will be
     performed by the Company or obtained from third parties following the
     Spinoff.

     PageNet funds certain disbursements on behalf of the Company, with a
     corresponding increase in amounts due PageNet. In addition, amounts due
     PageNet are immediately credited or charged upon the recording of certain
     transactions, including the recognition of certain sales to PageNet and the
     payment of certain expenses by PageNet on behalf of the Company.
     Accordingly, no receivables or payables for these transactions are
     reflected on the Company's balance sheet. For purposes of the statement of
     cash flows, amounts paid by PageNet on behalf of the Company and expenses
     allocated to the Company by PageNet are presented as cash used in operating
     or investing activities and changes in the amount due PageNet are presented
     as financing activities. To the extent that PageNet has provided funds to
     the Company and paid expenses on behalf of the Company in excess of the
     amounts transferred to PageNet, the Company is charged interest at the rate
     PageNet pays under its domestic credit facility. The weighted average
     interest rate on the amounts due PageNet, which is reset monthly, was 7.59%
     and 7.51% during the period September 1, 1998 (inception) through December
     31, 1998, and the nine months ended September 30, 1999, respectively. This
     arrangement resulted in interest expense that may not be representative of
     what the Company would have paid if it were not affiliated with PageNet. In
     October 1999, the Company repaid $10.0 million of the amounts due PageNet.

     On September 30, 1999, the Company borrowed $30.0 million from PageNet
     under a promissory note agreement between PageNet and the Company (the
     PageNet Note). The PageNet Note is due on demand by PageNet, has no stated
     maturity, and does not bear interest. For financial reporting purposes,
     interest expense will be recognized by the Company on the PageNet Note
     based on the interest rate PageNet pays under its domestic credit facility,
     which was the source of the funds loaned to the Company by PageNet, with a
     corresponding increase to stockholder's net investment. As the PageNet Note
     is payable on demand by PageNet, it has been classified as a current
     liability in the accompanying balance sheet as of September 30, 1999.

4.   SILVERLAKE ACQUISITION

     On December 9, 1998, PageNet completed the acquisition of all the
     outstanding stock of Silverlake for a total purchase price of $2.4 million,
     comprised of cash consideration of $1.75 million and 100,000 shares of
     common stock of PageNet (the Acquisition). The Acquisition of Silverlake
     was accounted for as a purchase.

                                      FF-11
<PAGE>   392

     The purchase price has been allocated to the assets and liabilities
     acquired based upon their fair values at the date of acquisition, as
     follows:

<TABLE>
    <S>                                                             <C>
    Consideration:
      Cash......................................................    $1,750,000
      Common stock of PageNet...................................       612,500
      Acquisition costs.........................................        18,000
                                                                    ----------
              Total consideration...............................    $2,380,500
                                                                    ==========
    Assets acquired and liabilities assumed:
      Cash......................................................    $   40,612
      Accounts receivable.......................................        95,986
      Prepaid expenses and other assets.........................        14,521
      Property and equipment....................................        42,685
      Developed technology......................................       727,600
      Goodwill..................................................     1,135,039
      Other intangible assets...................................       217,500
      Accounts payable..........................................       (11,225)
      Accrued liabilities.......................................       (34,718)
                                                                    ----------
    Total assets acquired and liabilities assumed...............     2,228,000
      In-process research and development costs.................       152,500
                                                                    ----------
    Total.......................................................    $2,380,500
                                                                    ==========
</TABLE>

     In connection with the acquisition of Silverlake, the Company recorded a
     charge of $152,500 for research and development activities in process at
     the date of the acquisition. The Company used an independent third-party
     appraiser to assess and value the in-process research and development. The
     amount of the Silverlake purchase price allocated to in-process research
     and development represents the estimated fair market value, based on
     risk-adjusted cash flows, of the one in-process research project that had
     not yet reached technological feasibility and for which no alternative
     future use existed at the date of the acquisition. The value assigned to
     the purchased in-process research and development was determined by
     estimating the costs to develop Silverlake's purchased in-process research
     and development into a commercially viable product, estimating the
     resulting net cash flows from the project and discounting the net cash
     flows to their present value.

     The terms of the Acquisition also provided for additional consideration of
     up to $4.0 million payable at various dates through March 31, 2001, if
     certain conditions were met. The additional consideration is equal to
     twenty-five percent of revenues derived from purchasers and licensees of
     Silverlake's products existing on December 1, 1998 during the six month
     periods ended June 30, 1999 and December 31, 1999, and fifty percent of
     such revenues during the six month periods ended June 30, 2000 and December
     31, 2000. Any additional consideration due is payable by the Company three
     months following the end of the respective valuation period. The payment of
     the additional consideration is contingent upon the continued employment of
     the former owners of Silverlake. As a result, any consideration due to the
     former owners of Silverlake is recorded as an expense over the respective
     valuation period. The Company recorded expense of $112,500 under this
     arrangement for the additional consideration earned during the nine months
     ended September 30, 1999.

5.   CONCENTRATIONS OF RISK

     A significant portion of the Company's revenues consists of licensing
     software to companies in the U.S. paging industry, which gives rise to a
     concentration of credit risk in receivables. As of September 30, 1999,
     amounts receivable from companies in the U.S. paging industry represented
     approximately 38% of gross accounts receivable from non-affiliates.
     Revenues from companies in the

                                      FF-12
<PAGE>   393

     U.S. paging industry represented approximately 32% of revenues from
     external customers during the nine months ended September 30, 1999. The
     Company performs on-going credit evaluations of its customers' financial
     condition and generally requires no collateral. The Company maintains an
     allowance for doubtful accounts based on the expected collectability of its
     accounts receivable. The allowance for doubtful accounts as of December 31,
     1998 and September 30, 1999 and write-offs of accounts receivable during
     1998 and 1999 were insignificant.

6.   INCOME TAXES

     The Company is included in the consolidated U.S. federal and various state
     income tax returns of PageNet. Under the terms of PageNet's tax sharing
     policy, income taxes are allocated to the Company as if the Company was a
     separate taxable entity. Under this method, deferred tax assets and
     liabilities are determined based on differences between financial reporting
     and tax bases of assets and liabilities and are measured using the enacted
     tax rates.

     For the period September 1, 1998 (inception) through December 31, 1998, and
     the nine months ended September 30, 1999, the Company had no provision or
     benefit for income taxes because the deferred benefit from the operating
     losses was offset by an increase in the valuation allowance on deferred tax
     assets of $1.6 million, $8.9 million, respectively. The income tax
     provision differed from amounts computed at the federal statutory income
     tax rate as follows:

<TABLE>
<CAPTION>
                                                                    SEPTEMBER 1
                                                                    (INCEPTION)      NINE MONTHS
                                                                      THROUGH           ENDED
                                                                    DECEMBER 31,    SEPTEMBER 30,
                                                                        1998            1999
                                                                    ------------    -------------
    <S>                                                             <C>             <C>
    Income tax benefit at the federal statutory rate............    $(1,457,307)     $(7,871,255)
      Increase in income taxes resulting from:
         Non-recognition of tax benefit of current year
           losses...............................................      1,644,296        8,903,332
         Amortization of intangible assets......................          6,621           59,590
         Meals and entertainment expenses.......................         14,577           32,798
         State income tax provision, net of federal benefit.....       (208,187)      (1,124,465)
                                                                    -----------      -----------
    Income tax provision (benefit)..............................    $        --      $        --
                                                                    ===========      ===========
</TABLE>

     Significant components of the Company's deferred tax assets and liabilities
     as of December 31, 1998 and September 30, 1999, were as follows:

<TABLE>
<CAPTION>
                                                                   DECEMBER 31,    SEPTEMBER 30,
                                                                       1998            1999
                                                                   ------------    -------------
    <S>                                                            <C>             <C>
    Deferred tax assets:
      Net operating loss carryforwards.........................    $ 1,535,431     $ 10,018,120
      Intangible assets........................................         71,970          135,252
      Deferred revenue.........................................             --          105,904
      Accounts receivable......................................             --            9,750
      Accrued liabilities......................................          7,020            7,020
      Valuation allowance......................................     (1,607,255)     (10,275,136)
                                                                   -----------     ------------
    Total deferred tax assets..................................          7,166              910
    Deferred tax liabilities:
      Depreciation.............................................         (7,166)            (910)
                                                                   -----------     ------------
    Net deferred tax asset (liability).........................    $        --     $         --
                                                                   ===========     ============
</TABLE>

     As of September 30, 1999, the Company has net operating loss carryforwards
     of approximately $26.0 million available under the terms of PageNet's tax
     sharing policy. These net operating loss

                                      FF-13
<PAGE>   394

     carryforwards expire in 2018 and 2019. There were no significant federal or
     state income taxes paid or refunded during 1998 or 1999.

     Following the Spinoff, the Company will file separate U.S. federal and
     state income tax returns. The net operating loss carryforwards retained by
     the Company following the Spinoff may differ from the amounts presented
     above.

7.   STOCK OPTIONS

     The Company participates in PageNet's 1991 Stock Option Plan (1991 Plan),
     whereby officers and key employees of PageNet and its affiliates may be
     granted incentive stock options and non-statutory options to purchase
     common stock of PageNet at not less than 100% of the fair market value of
     PageNet's common stock on the date the options are granted. The 1991 Plan
     is administered by the Compensation and Management Development Committee of
     the Board of Directors of PageNet (the Committee). Options granted under
     the 1991 Plan are non-transferable except by the laws of descent and
     distribution and are exercisable upon vesting, which occurs in installments
     as determined by the Committee at the time it grants such options.

     Options to purchase shares of PageNet have been granted to officers and key
     employees of the Company. Options granted are exercisable at the market
     value upon grant, become exercisable over one to five years following the
     date of grant, and expire ten years from the date of grant. As of September
     30, 1999, there were approximately 1.3 million outstanding options to
     purchase shares of PageNet common stock held by officers and key employees
     of the Company, of which approximately 440,000 were exercisable. These
     options have exercise prices ranging from $1.03 to $17.13 per share of
     PageNet common stock, with a total exercise value of approximately $12.0
     million. Upon the consummation of the Arch-PageNet Merger, all outstanding
     options to purchase shares of PageNet common stock, including those held by
     officers and key employees of the Company, will be converted into options
     to purchase shares of Arch common stock.

     The Company has adopted the pro forma disclosure features of Statement of
     Financial Accounting Standards No. 123, Accounting for Stock-Based
     Compensation (FAS 123). As required by FAS 123, pro forma information
     regarding net income has been determined as if the Company had accounted
     for grants of stock options and awards by PageNet to employees of the
     Company using the fair value method prescribed by FAS 123. For purposes of
     the pro forma disclosures, the estimated fair market value of the options
     is amortized to expense over the vesting period. The Company's pro forma
     net loss for the period September 1, 1998 (inception) through December 31,
     1998, and the nine months ended September 30, 1999 is $4,168,879 and
     $22,221,146, respectively.

8.   COMMITMENTS AND CONTINGENCIES

     PageNet has entered into various agreements with information content
     providers to provide the Company with news, sports, weather, business, and
     financial information for its information content services. As of September
     30, 1999, the aggregate commitment under such agreements was approximately
     $13.0 million.

     The Company leases office facilities and certain equipment under operating
     leases for various periods. Leases that expire are generally expected to be
     renewed or replaced by other leases. Rental expense was $351,572 for the
     nine months ended September 30, 1999. Future minimum base rents under terms
     of non-cancellable operating leases are as follows:

<TABLE>
    <S>                                                        <C>
    Year ending December 31:
      2000.................................................    $  755,250
      2001.................................................       813,829
      2002.................................................       817,808
      2003.................................................       827,481
      2004 and thereafter..................................     1,112,697
</TABLE>

                                      FF-14
<PAGE>   395

                         REPORT OF INDEPENDENT AUDITORS

The Board of Directors and Stockholder
Silverlake Communications, Inc.

     We have audited the accompanying balance sheets of Silverlake
Communications, Inc. (the Company) as of December 31, 1997 and December 9, 1998,
and the related statements of operations, stockholders' equity, and cash flows
for the year ended December 31, 1997, and the period January 1, 1998 through
December 9, 1998. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.

     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Silverlake Communications,
Inc. as of December 31, 1997 and December 9, 1998, and the results of its
operations and its cash flows for the year ended December 31, 1997, and the
period January 1, 1998 through December 9, 1998, in conformity with generally
accepted accounting principles.

                                                           /s/ ERNST & YOUNG LLP

Dallas, Texas
December 23, 1999

                                      FF-15
<PAGE>   396

                        SILVERLAKE COMMUNICATIONS, INC.

                                 BALANCE SHEETS

<TABLE>
<CAPTION>
                                                              DECEMBER 31,    DECEMBER 9,
                                                                  1997           1998
                                                              ------------    -----------
<S>                                                           <C>             <C>
ASSETS
Current assets:
  Cash and cash equivalents.................................    $172,513       $ 40,612
  Accounts receivable.......................................      75,580         95,986
  Prepaid expenses and other current assets.................       2,400          5,405
                                                                --------       --------
Total current assets........................................     250,493        142,003
Property and equipment, at cost.............................      77,526         84,345
Accumulated depreciation....................................     (29,151)       (41,660)
                                                                --------       --------
Total property and equipment................................      48,375         42,685
                                                                --------       --------
Total assets................................................    $298,868       $184,688
                                                                ========       ========
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable..........................................    $  5,801       $ 11,225
  Accrued compensation......................................      39,711         18,694
  Other accrued liabilities.................................      23,481         16,024
                                                                --------       --------
Total current liabilities...................................      68,993         45,943
Stockholders' equity:
  Common stock ($1.00 par value; 100,000 shares authorized;
     100 shares issued and outstanding).....................         100            100
  Retained earnings.........................................     229,775        138,645
                                                                --------       --------
Total stockholders' equity..................................     229,875        138,745
                                                                --------       --------
Total liabilities and stockholders' equity..................    $298,868       $184,688
                                                                ========       ========
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                      FF-16
<PAGE>   397

                        SILVERLAKE COMMUNICATIONS, INC.

                            STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                                                 JANUARY 1
                                                                 YEAR ENDED       THROUGH
                                                                DECEMBER 31,    DECEMBER 9,
                                                                    1997           1998
                                                                ------------    -----------
<S>                                                             <C>             <C>
Revenues....................................................      $896,166       $897,379
Operating costs and expenses:
  Costs of revenues.........................................       145,618        157,149
  Selling, general and administrative.......................       538,142        610,560
  Research and development activities.......................        75,500         68,750
                                                                  --------       --------
Total operating costs and expenses..........................       759,260        836,459
                                                                  --------       --------
Income from operations......................................       136,906         60,920
Interest income.............................................         3,893          1,891
                                                                  --------       --------
Income before taxes.........................................       140,799         62,811
Provision for income taxes..................................        (2,112)          (941)
                                                                  --------       --------
Net income..................................................      $138,687       $ 61,870
                                                                  ========       ========
Pro forma information (Note 4):
  Income before taxes.......................................      $140,799       $ 62,811
  Provision for income taxes................................       (60,112)       (31,501)
                                                                  --------       --------
  Net income................................................      $ 80,687       $ 31,310
                                                                  ========       ========
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                      FF-17
<PAGE>   398

                        SILVERLAKE COMMUNICATIONS, INC.

                       STATEMENTS OF STOCKHOLDERS' EQUITY

<TABLE>
<CAPTION>
                                                                                      TOTAL
                                                         COMMON    RETAINED       STOCKHOLDERS'
                                                         STOCK     EARNINGS          EQUITY
                                                         ------    ---------      -------------
<S>                                                      <C>       <C>            <C>
Balance at January 1, 1997.............................   $100     $ 109,088        $ 109,188
  Net income...........................................     --       138,687          138,687
  Dividends declared...................................     --       (18,000)         (18,000)
                                                          ----     ---------        ---------

Balance at December 31, 1997...........................    100       229,775          229,875
  Net income...........................................     --        61,870           61,870
  Dividends declared...................................     --      (153,000)        (153,000)
                                                          ----     ---------        ---------
Balance at December 9, 1998............................   $100     $ 138,645        $ 138,745
                                                          ====     =========        =========
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                      FF-18
<PAGE>   399

                        SILVERLAKE COMMUNICATIONS, INC.

                            STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                 JANUARY 1
                                                                 YEAR ENDED       THROUGH
                                                                DECEMBER 31,    DECEMBER 9,
                                                                    1997            1998
                                                                ------------    ------------
<S>                                                             <C>             <C>
OPERATING ACTIVITIES:
Net income..................................................      $138,687       $  61,870
Adjustments to reconcile net income to net cash provided by
  operating activities:
  Depreciation..............................................        10,348          12,509
  Changes in operating assets and liabilities:
     Accounts receivable....................................        33,955         (20,406)
     Prepaid expenses and other current assets..............        (1,614)         (3,005)
     Accounts payable and accrued liabilities...............        34,296         (23,050)
                                                                  --------       ---------
Net cash provided by operating activities...................       215,672          27,918
INVESTING ACTIVITIES:
Capital expenditures........................................       (48,620)         (6,819)
FINANCING ACTIVITIES:
Repayment of note receivable from officer...................        20,210              --
Cash dividends paid.........................................       (18,000)       (153,000)
                                                                  --------       ---------
Net cash provided by (used in) financing activities.........         2,210        (153,000)
                                                                  --------       ---------
Net increase in cash and cash equivalents...................       169,262        (131,901)
Cash and cash equivalents at beginning of period............         3,251         172,513
                                                                  --------       ---------
Cash and cash equivalents at end of period..................      $172,513       $  40,612
                                                                  ========       =========
</TABLE>

The accompanying notes are an integral part of these financial statements.

                                      FF-19
<PAGE>   400

                        SILVERLAKE COMMUNICATIONS, INC.

                         NOTES TO FINANCIAL STATEMENTS

1.   THE COMPANY

     Silverlake Communications, Inc. (the Company) was incorporated as a
     California corporation on June 9, 1995. Prior to June 9, 1995, the Company
     operated as partnership from its inception in 1993. The Company has created
     and markets a sophisticated suite of software products focusing on wireless
     communications management for mobile professionals. The Company's Airsource
     suite of products spans from stand-alone one-way wireless messaging to
     advanced two-way local area and wide area network solutions.

2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     USE OF ESTIMATES

     The preparation of financial statements in conformity with generally
     accepted accounting principles requires management to make estimates and
     assumptions that affect the amounts reported in the financial statements
     and accompanying notes. Actual results could differ from those estimates.

     REVENUE RECOGNITION

     For software sales transactions entered into subsequent to December 31,
     1997, revenue is recognized in accordance with the provisions of American
     Institute of Certified Public Accountants' Statement of Position (SOP)
     97-2, Software Revenue Recognition. Under SOP 97-2, software license
     revenues are recognized upon execution of a contract and delivery of
     software, provided that the license fee is fixed and determinable, no
     significant production, modification or customization of the software is
     required, and collection is considered probable by management.

     For software sales transactions entered into prior to December 31, 1997,
     revenues were recognized in accordance with SOP 91-1, Software Revenue
     Recognition. Under SOP 91-1, software license revenues were recognized upon
     execution of a contract and shipment of the software and after any customer
     cancellation right had expired, provided that no significant vendor
     obligations remained outstanding, amounts were due within one year, and
     collection was considered probable by management. The application of SOP
     97-2 did not have a material impact on the Company's consolidated financial
     statements for the period ended December 9, 1998.

     The Company provides telephone customer and technical support and software
     upgrades as an accommodation to purchasers of its products as a means of
     fostering customer satisfaction. The majority of such services are provided
     during the first 30 days of ownership of the Company's products. The costs
     associated with these services, which are insignificant in relation to
     product sales value, are accrued.

     CASH AND CASH EQUIVALENTS

     The Company considers all highly liquid investments with maturities of
     three months or less when purchased to be cash equivalents. Cash and cash
     equivalents consists primarily of depository and money market accounts.

     PROPERTY AND EQUIPMENT

     Property and equipment consists of furniture and fixtures, computer
     equipment, and computer software and is stated at original cost less
     allowance for accumulated depreciation. Expenditures for normal maintenance
     and repairs are charged to expense as incurred. Depreciation of property
     and equipment is computed using the straight-line method over the estimated
     lives of the assets which range from five to seven years.

                                      FF-20
<PAGE>   401

     The Company leased its office facilities under an operating lease expiring
     on December 31, 1998. Rental expense was $54,375 and $70,498 for the year
     ended December 31, 1997 and the period ended December 9, 1998,
     respectively.

     RESEARCH AND DEVELOPMENT COSTS

     Research and product development costs, which are not subject to Statement
     of Financial Accounting Standards No. 86, Accounting for the Cost of
     Computer Software to be Sold, Leased, or Otherwise Marketed, are expensed
     as incurred and relate mainly to the development of new products and the
     ongoing maintenance of existing products. Software development costs are
     expensed as incurred until technological feasibility has been established,
     at which time such costs are capitalized until the point at which the
     product is available for general release to customers. Since the Company's
     inception, the establishment of technological feasibility of the Company's
     products and general release of such software have substantially coincided.
     As a result, software development costs qualifying for capitalization have
     been insignificant and, therefore, the Company has historically expensed
     all software development costs.

3.   CONCENTRATIONS OF RISK

     A significant portion of the Company's revenues consists of licensing
     software and providing consulting services to the U.S. paging industry,
     which gives rise to a concentration of credit risk in receivables. The
     Company performs on-going credit evaluations of its customers' financial
     condition and generally requires no collateral. Revenues from companies in
     the U.S. paging industry represented approximately 59% and 42% of total
     revenues during the year ended December 31, 1997 and the period January 1,
     1998 through December 9, 1998, respectively. Paging Network, Inc. (PageNet)
     represented 45% and 25% of revenues during the year ended December 31, 1997
     and the period January 1, 1998 through December 9, 1998, respectively. One
     other customer represented 13% of revenues during the period January 1,
     1998 through December 9, 1998.

4.   INCOME TAXES

     Effective at its incorporation on June 9, 1995, the Company elected to be
     treated as an S Corporation for federal and California state tax purposes.
     As a result of this election, the Company was not a taxable entity for
     federal tax purposes from June 9, 1995, through December 9, 1998, and,
     accordingly, the Company's net income was includable in the Federal income
     tax returns of the Company's stockholders. No provision for federal income
     taxes has been made in the accompanying financial statements for the period
     from January 1, 1997, through December 9, 1998. Also as a result of this
     election, the Company was taxed for California state income tax purposes at
     the S Corporation state tax rate of 1.5% through December 9, 1998. The
     accompanying financial statements include a provision of 1.5% of income
     before taxes for California state income taxes for the year ended December
     31, 1997, and the period ended December 9, 1998. Deferred income tax assets
     and liabilities are determined based on differences between financial
     reporting and income tax bases of assets and liabilities and are measured
     using the California S Corporation state tax rate of 1.5%. The net deferred
     tax asset or liability as of each balance sheet date, which is not
     material, has been included in prepaid expenses and other current assets
     and accrued liabilities in the accompanying balance sheet.

     The pro forma provision for income taxes and net income presented in the
     accompanying financial statements has been determined as if the Company
     were taxed as a C Corporation for federal and state tax purposes. The pro
     forma net deferred tax asset or liability as of each balance sheet date is
     not material.

5.   EMPLOYEE BENEFITS

     The Company maintains a Section 401(k) Salary Deferral Plan (the Plan).
     Employees 21 years of age or older and with one or more years of service to
     the Company are eligible to participate in the Plan. Under the Plan, the
     Company makes an annual contribution of a portion of the Company's

                                      FF-21
<PAGE>   402

     profits for the benefit of participating employees. The Company's expenses
     under the Plan were $35,149 for the year ended December 31, 1997 and
     $21,517 for the period January 1, 1998 through December 9, 1998. The Plan
     was terminated on December 9, 1998.

6.   ACQUISITION OF THE COMPANY

     On December 9, 1998, all of the outstanding stock of the Company was
     acquired by PageNet for a total purchase price of approximately $2.4
     million, comprised of cash consideration of $1.75 million and 100,000
     shares of common stock of PageNet. The terms of the acquisition also
     provide for additional consideration of up to $4.0 million payable at
     various dates through March 31, 2001, if certain conditions are met.

                                      FF-22
<PAGE>   403

                                                                         ANNEX G

                      [ANNEX G TO BE FILED BY AMENDMENT.]

                                       G-1
<PAGE>   404

                                                                         ANNEX H

              UNAUDITED COMBINED COMPANY PROJECTED BALANCE SHEETS
                                 (IN MILLIONS)

<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                              --------------------
                                                                2000        2001
                                                              --------    --------
<S>                                                           <C>         <C>
ASSETS
Current assets:
  Cash and cash equivalents.................................  $    6.0    $    4.0
  Accounts receivable, net..................................     129.3       131.7
  Inventories...............................................      24.7        26.8
  Prepaid expenses and other................................      26.8        27.4
                                                              --------    --------
     Total current assets...................................     186.8       189.9
Property and equipment, net.................................   1,004.5       828.9
Intangible and other assets, net............................   1,348.2     1,061.9
                                                              --------    --------
                                                              $2,539.5    $2,080.7
                                                              ========    ========
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Current maturities of long-term debt......................  $  108.9    $  132.5
  Accounts payable..........................................     108.2       103.1
  Accrued expenses..........................................      98.1       116.4
  Accrued interest..........................................      51.2        49.5
  Customer deposits and deferred revenue....................      77.9        79.5
  Accrued restructuring charges.............................      25.7          --
                                                              --------    --------
     Total current liabilities..............................     470.0       481.0
Long-term debt, less current maturities.....................   1,585.3     1,438.9
Other long-term liabilities.................................      65.5        55.5
Stockholders' equity........................................     418.7       105.3
                                                              --------    --------
                                                              $2,539.5    $2,080.7
                                                              ========    ========
</TABLE>

                                       H-1
<PAGE>   405

         UNAUDITED COMBINED COMPANY PROJECTED STATEMENTS OF OPERATIONS
                                 (IN MILLIONS)

<TABLE>
<CAPTION>
                                                                 SIX MONTHS
                                                                    ENDED            YEAR ENDED
                                                              DECEMBER 31, 2000   DECEMBER 31, 2001
                                                              -----------------   -----------------
<S>                                                           <C>                 <C>
Service, rental and maintenance revenues....................       $ 785.9            $ 1,602.9
Product sales...............................................          79.3                155.7
                                                                   -------            ---------
  Total revenues............................................         865.2              1,758.6
Cost of products sold.......................................         (58.4)              (114.6)
                                                                   -------            ---------
                                                                     806.8              1,644.0
                                                                   -------            ---------
Operating expenses:
  Service, rental and maintenance...........................         199.1                398.2
  Selling...................................................         105.0                221.7
  General and administrative................................         234.5                441.5
  Depreciation and amortization.............................         343.0                714.3
                                                                   -------            ---------
     Total operating expenses...............................         881.6              1,775.7
                                                                   -------            ---------
Operating income (loss).....................................         (74.8)              (131.7)
Interest expense, net.......................................          94.5                181.7
                                                                   -------            ---------
Net income (loss)...........................................       $(169.3)             $(313.4)
                                                                   =======            =========
</TABLE>

                                       H-2
<PAGE>   406

         UNAUDITED COMBINED COMPANY PROJECTED STATEMENTS OF CASH FLOWS
                                 (IN MILLIONS)

<TABLE>
<CAPTION>
                                                                 SIX MONTHS
                                                                    ENDED            YEAR ENDED
                                                              DECEMBER 31, 2000   DECEMBER 31, 2001
                                                              -----------------   -----------------
<S>                                                           <C>                 <C>
Net cash provided by operating activities...................       $ 163.9             $ 374.3
                                                                   -------             -------
Cash flow from investing activities:
  Additions to property and equipment, net..................        (136.8)             (241.4)
  Additions to intangible and other assets..................          (5.0)              (11.0)
                                                                   -------             -------
Net cash used from investing activities.....................        (141.8)             (252.4)
                                                                   -------             -------
Cash flows from financing activities-repayment of long-term
  debt......................................................         (23.1)             (123.9)
                                                                   -------             -------
Net increase in cash and cash equivalents...................          (1.0)               (2.0)
Cash and cash equivalents, beginning of period..............           7.0                 6.0
                                                                   -------             -------
Cash and cash equivalents, end of period....................       $   6.0             $   4.0
                                                                   =======             =======
EBITDA......................................................       $ 268.2             $ 582.6
                                                                   =======             =======
</TABLE>

UNAUDITED FINANCIAL PROJECTIONS AND OPERATIONAL COST SYNERGIES

     Arch and PageNet have developed the unaudited combined company projections
reflected herein. The projections consist of projected operating and financial
results for the six months ending December 31, 2000 and the year ending December
31, 2001. The projections assume that the merger and related transactions will
take place as of June 30, 2000. The projections have been prepared for filing
with the bankruptcy court if PageNet commences a bankruptcy case.

     The projections, which were developed by management of each of Arch and
PageNet, are based on:

             - Arch's projected financial results, as developed by the
               management of Arch, taking into account anticipated cost
               reductions associated with its integration of MobileMedia;

             - PageNet's projected financial results, as developed by the
               management of PageNet, taking into account anticipated cost
               reductions associated with the restructuring of its domestic
               operations and divestiture of 80.5% of its interest in Vast;

     Certain adjustments to PageNet's projected results were made by the
management of Arch to reflect more conservative assumptions with regard to
expected subscriber additions, subscriber turnover and net revenues. Such
adjustments were intended to reflect the continuing potential impact from the
effects of a bankruptcy case and the integration of Arch's and PageNet's
operations.

ASSUMPTIONS USED IN THE UNAUDITED FINANCIAL PROJECTIONS

     A number of important assumptions are reflected in the projections. No
assurance can be given that such assumptions will be realized. See "Risk
Factors" for a discussion of various factors that could materially affect the
combined company's financial condition, results of operations, business,
prospects and securities.

          1. The projections assume the merger will take place on June 30, 2000.

          2. The projections assume that general economic conditions will
     continue unchanged throughout the projection period and that their
     potential impact on capital spending and revenues within each of the
     combined company's operating regions will not fluctuate.

          3. Management estimates that it will achieve $80 million in operating
     cost reductions annually after the consummation of the merger. However, due
     to the time involved in implementing these cost savings, the projections
     assume that the combined company would recognize only $5.5 million in

                                       H-3
<PAGE>   407

     operating cost reductions for the six months ended December 31, 2000, and
     $56 million in operating cost reductions for the year ended December 31,
     2001. The managements of Arch and PageNet estimated the amounts and timing
     of these operating cost reductions during multiple meetings. During these
     meetings, they performed a market-by-market analysis to identify redundant
     costs.

          4. Service revenues for the combined company have been projected on
     the basis of Arch management's estimates for subscriber growth and average
     revenue per unit. Based on these estimates, Arch's service revenues for
     2000 were projected to decrease by approximately 1.1% from 1999 estimates,
     while PageNet's service revenues were projected to decrease by
     approximately 9.2% from 1999 estimates. Arch's service revenues for 2001
     were projected to increase by 3.0% as compared to 2000, and PageNet's
     service revenues were projected to decrease by 0.5% as compared to 2000.

          5. Projected operating costs for 2000 are based on historical cost
     margins for both companies individually and the expected decrease in cost
     margins as Arch achieves further cost reductions resulting from its
     integration of MobileMedia and PageNet. The combined company's projected
     operating costs for 2000 are based on the 1999 business plans for the
     individual companies, which included three quarters of historical costs at
     the time the projections were created. The cost margins used for 2000
     assume a reduction in the historical cost margins (approximately 2.2% of
     net revenue) for Arch's base business and assume a reduction in the
     historical cost margins (approximately 1.7% of net revenue) for PageNet's
     base business. Projected costs are based upon historical experience,
     expected market conditions and historical decreases in Arch's costs as Arch
     increased its operating leverage. These cost assumptions were then adjusted
     to reflect the impact of the assumed synergies.

          6. The projections assume that the combined company will utilize
     available borrowing capacity from its senior credit facility to fully repay
     all administrative claims and transaction expenses and provide for working
     capital throughout the period of the projections. Outstanding obligations
     to PageNet's secured bank lenders are assumed to become obligations of the
     combined company.

          7. Interest expense is calculated based upon the capital structure
     that would result upon consummation of the merger and related transactions,
     as described in "Unaudited Selected Pro Forma Consolidated Financial Data",
     during the projection period. This assumes tender and acceptance of 100% of
     Arch's discount notes and 100% of PageNet's senior subordinated notes.
     Interest also includes the amortization of any original issue discounts.

          8. The projections have been prepared in accordance with applicable
     principles of purchase accounting. Under purchase accounting principles,
     the combined company will record an intangible asset equal to the excess,
     if any, of the purchase price paid by Arch in the merger over the net fair
     market value allocated to the identifiable assets and liabilities of
     PageNet. We refer to any such excess as goodwill. The projections assume
     that goodwill will be amortized ratably on a straight-line basis over a
     period of 10 years. The actual calculation of goodwill will depend upon the
     actual price of Arch's common stock at the time of the merger. The
     projections assume a value of $6.02 per share of Arch common stock to
     calculate the purchase accounting adjustment and an assumption that the
     historical, restated book value of PageNet's assets and liabilities
     generally approximates fair value.

          Arch and PageNet have made these assumptions and resultant
     computations solely for the purpose of preparing the projections. The
     combined company will be required to determine the actual amount of
     goodwill and the appropriate amortization period when the merger takes
     place. Such determination will be based on the fair values of PageNet's net
     assets and other relevant information when the merger takes place. Although
     these determinations are not currently expected to result in the actual
     amount of goodwill and related amortization being materially greater or
     less than the amounts assumed for purposes of the projections, there can be
     no assurance in that regard. Any increase in the amount of amortization of
     goodwill would reduce periodic income before taxes and net income.

          9. Projections of changes in certain balance sheet accounts such as
     accounts receivable and accounts payable are based on historic ratios of
     such accounts to other accounts such as revenue.

                                       H-4
<PAGE>   408

     These projections have been modified, where deemed appropriate, to
     recognize any adjustment or balance sheet item changes necessary to reflect
     the business combination. Arch assumed approximately 30 days sales
     outstanding to estimate the accounts receivable balance and approximately
     45 days costs outstanding to estimate the accounts payable balance. The
     projected long-term debt reflects payments made to reduce borrowings under
     the senior credit facility.

     THE COMBINED COMPANY PROJECTIONS WERE NOT PREPARED TO COMPLY WITH THE
GUIDELINES FOR PROSPECTIVE FINANCIAL STATEMENTS PUBLISHED BY THE AMERICAN
INSTITUTE OF CERTIFIED PUBLIC ACCOUNTANTS. NEITHER THE INDEPENDENT ACCOUNTANTS
FOR ARCH NOR THE INDEPENDENT AUDITORS FOR PAGENET HAVE EXAMINED OR COMPILED THE
ACCOMPANYING PROJECTIONS AND ACCORDINGLY DO NOT EXPRESS AN OPINION OR ANY OTHER
FORM OF ASSURANCE WITH RESPECT TO THE PROJECTIONS, ASSUME NO RESPONSIBILITY FOR
THE PROJECTIONS AND DISCLAIM ANY ASSOCIATION WITH THE PROJECTIONS.

     ARCH AND PAGENET DO NOT PUBLISH PROJECTIONS OF THEIR RESPECTIVE ANTICIPATED
FINANCIAL POSITION OR RESULTS OF OPERATIONS. THE COMBINED COMPANY PROJECTIONS
WERE PREPARED FOR THE DISCLOSURE STATEMENT BEING DISTRIBUTED TO PAGENET'S
CREDITORS IN CONNECTION WITH THE POSSIBLE COMMENCEMENT OF A BANKRUPTCY CASE.
PAGENET DID THIS IN ORDER TO SATISFY APPLICABLE REQUIREMENTS FOR INFORMATION
REQUIRED TO BE INCLUDED IN A BANKRUPTCY COURT APPROVED DISCLOSURE STATEMENT. THE
PROJECTIONS ARE PROVIDED IN THIS PROSPECTUS SO THAT ARCH STOCKHOLDERS AND
NOTEHOLDERS WILL HAVE THE SAME INFORMATION AS IS BEING PROVIDED TO PAGENET'S
CREDITORS. ACCORDINGLY, ARCH AND PAGENET DO NOT INTEND, AND DISCLAIM ANY
OBLIGATION TO,

     - FURNISH UPDATED COMBINED COMPANY PROJECTIONS,

     - INCLUDE SUCH UPDATED INFORMATION IN ANY DOCUMENTS WHICH MAY BE REQUIRED
       TO BE FILED WITH THE SEC, OR

     - OTHERWISE MAKE SUCH UPDATED INFORMATION PUBLICLY AVAILABLE.

     THE PROJECTIONS, ALTHOUGH PRESENTED WITH NUMERICAL SPECIFICITY, ARE BASED
UPON A SERIES OF ESTIMATES AND ASSUMPTIONS WHICH, ALTHOUGH CONSIDERED REASONABLE
BY ARCH AND PAGENET, MAY NOT BE REALIZED, AND ARE INHERENTLY SUBJECT TO
SIGNIFICANT BUSINESS, ECONOMIC AND COMPETITIVE UNCERTAINTIES AND CONTINGENCIES,
MANY OF WHICH ARE BEYOND THE CONTROL OF ARCH AND PAGENET. NO REPRESENTATIONS CAN
BE OR ARE MADE AS TO THE ACCURACY OF THE COMBINED COMPANY PROJECTIONS. SOME
ASSUMPTIONS INEVITABLY WILL NOT MATERIALIZE, AND EVENTS AND CIRCUMSTANCES
OCCURRING SUBSEQUENT TO THE DATE ON WHICH THE PROJECTIONS WERE PREPARED MAY BE
DIFFERENT FROM THOSE ASSUMED OR MAY BE UNANTICIPATED AND, ACCORDINGLY, MAY
AFFECT FINANCIAL RESULTS IN A MATERIAL AND POSSIBLY ADVERSE MANNER. THE
PROJECTIONS, THEREFORE, MAY NOT BE RELIED UPON AS A GUARANTEE OR OTHER ASSURANCE
OF THE ACTUAL RESULTS THAT WILL OCCUR. SEE "FORWARD-LOOKING STATEMENTS".

                                       H-5
<PAGE>   409

                                    PART II

             INFORMATION NOT REQUIRED IN PROXY STATEMENT/PROSPECTUS

ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

     The Arch Certificate provides that Arch will, to the fullest extent
permitted by the Delaware corporations statute, indemnify all persons whom it
has the power to indemnify against all costs, expenses and liabilities incurred
by them by reason of having been officers or directors of Arch, any subsidiary
of Arch or any other corporation for which such persons acted as an officer or
director at the request of Arch.

     The Arch Certificate also provides that the directors of Arch will not be
personally liable for monetary damages to Arch or its stockholders for any act
or omission provided that the foregoing shall not eliminate or limit the
liability of a director (i) for any breach of the director's duty of loyalty to
Arch or its stockholders, (ii) for acts or omissions not in good faith or which
involve intentional misconduct or a knowing violation of law, (iii) under
Section 174 of the Delaware corporations statute (relating to illegal dividends
or stock redemptions) or (iv) for any transaction from which the director
derived an improper personal benefit. If the Delaware corporations statute is
amended to permit further elimination or limitation of the personal liability of
directors, then the liability of a director of Arch shall be eliminated or
limited to the fullest extent permitted by the Delaware corporations statute as
so amended.

ITEM 21.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

     (a) Exhibits

<TABLE>
<C>      <S>
  2.1    Agreement and Plan of Merger, dated as of November 7, 1999,
         among Paging Network, Inc., Arch Communications Group, Inc.
         and St. Louis Acquisition Corp.(1)
  2.2    Amendment to Agreement and Plan of Merger, dated as of
         January 7, 2000, between Paging Network, Inc., Arch
         Communications Group, Inc. and St. Louis Acquisition
         Corp.(2)
  3.1    Restated Certificate of Incorporation.(3)
  3.2    Certificate of Designations establishing the Series B Junior
         Participating Preferred Stock, filed with the Secretary of
         State of Delaware on October 19, 1995.(4)
  3.3    Certificate of Correction, filed with the Secretary of State
         of Delaware on February 15, 1996.(3)
  3.4    Certificate of Designations establishing the Series C
         Convertible Preferred Stock, filed with the Secretary of
         State of Delaware on June 29, 1998.(5)
  3.5    Certificate of Amendment of Restated Certificate of
         Incorporation, filed with the Secretary of State of Delaware
         on June 4, 1996.
  3.6    Certificate of Amendment of Restated Certificate of
         Incorporation, filed with the Secretary of State of Delaware
         on May 27, 1999.
  3.7    Certificate of Amendment of Restated Certificate of
         Incorporation, filed with the Secretary of State of Delaware
         on June 16, 1999.
  3.8    By-laws, as amended.(3)
  4.1    Indenture, dated February 1, 1994, between Arch
         Communications, Inc. formerly known as USA Mobile
         Communications, Inc. II) and United States Trust Company of
         New York, as Trustee, relating to the 9 1/2% Senior Notes
         due 2004 of Arch Communications, Inc.(6)
  4.2    Indenture, dated December 15, 1994, between Arch
         Communications, Inc. formerly known as USA Mobile
         Communications, Inc. II) and United States Trust Company of
         New York, as Trustee, relating to the 14% Senior Notes due
         2004 of Arch Communications, Inc.(7)
  4.3    Indenture, dated June 29, 1998, between Arch Communications,
         Inc. and U.S. Bank Trust National Association, as Trustee,
         relating to the 12 3/4% Senior Notes due 2007 of Arch
         Communications, Inc.(5)
  5.1*   Opinion of Hale and Dorr LLP
</TABLE>

                                      II-1
<PAGE>   410

<TABLE>
<S>        <C>
    8.1*   Tax opinion of Hale and Dorr LLP
    8.2*   Tax opinion of Mayer, Brown & Platt LLP
   10.1    Second Amended and Restated Credit Agreement (Tranche A and Tranche C (Facilities), dated June 29, 1998,
           among Arch Paging, Inc., the Lenders party thereto, The Bank of New York, Royal Bank of Canada and
           Toronto Dominion (Texas), Inc.(5)
   10.2    Second Amended and Restated Credit Agreement (Tranche B Facility), dated June 29, 1998, among Arch
           Paging, Inc., the Lenders party thereto. The Bank of New York, Royal Bank of Canada and Toronto Dominion
           (Texas), Inc.(5)
   10.3    Asset Purchase and Sale Agreement, dated April 10, 1998, among OmniAmerica, Inc. and certain
           subsidiaries of Arch Communications Group, Inc.(5)
   10.4    Letter agreement, dated June 10, 1998, between Arch Communications Group, Inc. and Motorola, Inc.(5)(8)
   10.5    Debtors' Third Amended Joint Plan of Reorganization, dated as of December 1, 1998.(9)
   10.9*   Registration Rights Agreement among Arch Communications Group, Inc. and W.R. Huff Asset Management Co.,
           L.L.C., The Northwestern Mutual Life Insurance Company, Northwestern Mutual Series Fund, Inc., Credit
           Suisse First Boston Corporation and Whippoorwill Associates, Inc.
   10.10*  Registration Rights Agreement among Arch Communications Group, Inc. and certain Stockholders
   10.11   Amendment No. 1 to Rights Agreement, dated June 29, 1998, between Arch Communications Group, Inc. and
           the Bank of New York.(5)
   10.12   Amendment No. 2 to Rights Agreement, dated as of August 18, 1998 amending the Rights Agreement between
           Arch Communications Group, Inc. and the Bank of New York.(17)
   10.13   Amendment No. 3 to Rights Agreement, dated September 3, 1998, amending the Rights Agreement between Arch
           Communications Group, Inc. and the Bank of New York.
   10.14   Amendment No. 4 to Rights Agreement, dated May 14, 1999, amending the Rights Agreement between Arch
           Communications Group, Inc. and the Bank of New York.(16)
   10.15   Amendment No. 5 to Rights Agreement, dated November 15, 1999, amending the Rights Agreement between Arch
           Communications Group, Inc. and the Bank of New York.(1)
   10.16   Warrant Agreement, between Arch Communications Group, Inc. and the Bank of New York, as provided for in
           the First Amendment to Agreement and Plan of Merger dated as of September 3, 1998, by and among Arch
           Communications Group, Inc, Farm Team Corp. and MobileMedia Communications Inc.
   10.17   Commitment Letter, dated as of August 18, 1998, by and among Arch Paging, Inc. and The Bank of New York,
           BNY Capital Markets, Inc., Toronto Dominion (Texas) Inc., TD Securities (USA) Inc., Royal Bank of Canada
           and Barclays Bank PLC amending the Second and Amended Restated Credit Agreements, dated June 29, 1998
           (Tranche A, B and C Facilities).
   10.19   Amendment No. 1 to Registration Rights Agreement, dated August 19, 1998, amending the Registration
           Rights Agreement dated as of June 29, 1998 by and among Arch Communications Group, Inc. and the Sandler
           Capital Partners IV, LP, Sandler Capital Partners IV, FTE LP, South Fork Partners, The Georgica
           International Fund Limited, Aspen Partners and Consolidated Press International Limited.(17)
  +10.20   Amended and Restated Stock Option Plan(10)
  +10.21   Non-Employee Directors' Stock Option Plan(11)
  +10.22   1989 Stock Option Plan, as amended(3)
  +10.23   1995 Outside Directors' Stock Option Plan(12)
  +10.24   1996 Employee Stock Purchase Plan(13)
</TABLE>

                                      II-2
<PAGE>   411

<TABLE>
<S>        <C>
  +10.25   1997 Stock Option Plan(14)
  +10.26   Deferred Compensation Plan for Nonemployee Directors(15)
  +10.27   Form of Executive Retention Agreement by and between Messrs. Baker, Daniels, Kuzia, Pottle and
           Saynor(15)
   10.28   Stock Purchase Agreement, dated June 29, 1998, among Arch Communications Group, Inc., Sandler Capital
           Partners IV, L.P., Sandler Capital Partners IV FTE, L.P., Harvey Sandler, John Kornreich, Michael J.
           Marocco, Andrew Sandler, South Fork Partners, the Georgica International Fund Limited, Aspen Partners
           and Consolidated Press International Limited(5)
   10.29   Registration Rights Agreement, dated June 29, 1998, among Arch Communications Group, Inc., Sandler
           Capital Partners IV, L.P., Sandler Capital Partners IV FTE, L.P., Harvey Sandler, John Kornreich,
           Michael J. Marocco, Andrew Sandler, South Fork Partners, The Georgica International Fund Limited, Aspen
           Partners and Consolidated Press International Limited(5)
   10.30   Exchange Agreement, dated June 29, 1998, between Adelphia Communications Corporation and Benbow PCS
           Ventures, Inc.(5)
   10.31   Promissory Note, dated June 29, 1998, in the Principal amount of $285,015, issued by Benbow PCS
           Ventures, Inc. to Lisa-Gaye Shearing(5)
   10.32   Guaranty, dated June 29, 1998, given by Arch Communications Group, Inc. to Adelphia Communications
           Corporation(5)
   10.33   Guaranty, dated June 29, 1998, given by Arch Communications Group, Inc. to Lisa-Gaye Shearing(5)
   10.34   Registration Rights Agreement, dated June 29, 1998, among Arch Communications Group, Inc., Adelphia
           Communications Corporation and Lisa-Gaye Shearing(5)
   21.1*   Subsidiaries of the Registrant
   23.1**  Consent of Arthur Andersen LLP
   23.2**  Consent of Ernst & Young LLP
   23.3**  Consent of Wilkinson, Barker, Knauer & Quinn, LLP
   23.4**  Consent of Ernst & Young LLP
   23.5*   Consent of Hale and Dorr LLP (contained in its opinion filed as Exhibits 5.1 and 8.1)
   23.6*   Consent of Mayer, Brown & Platt LLP (contained in its opinion filed as Exhibit 8.2)
   23.7*   Consent of Bear, Stearns & Co.
   23.8*   Consent of Houlihan, Lokey, Howard & Zukin Capital
   23.9*   Consent of Goldman, Sachs & Co.
   23.10*  Consent of Morgan Stanley Dean Witter
   24.1    Power of Attorney (included on signature page to this Registration Statement)
   27.1*   Financial Data Schedule
   99.1*   Form of Proxy for Arch Annual Meeting
</TABLE>

- ---------------
  *  To be filed by amendment.

 **  Filed herewith.

  +  Identifies exhibits constituting a management contract or compensation
     plan.

 (1) Incorporated by reference from the Current Report on Form 8-K of Arch
     Communications Group, Inc. dated November 7, 1999 and filed on November 19,
     1999.

 (2) Incorporated by reference from the Current Report on Form 8-K of Arch
     Communications Group, Inc. dated January 7, 2000 and filed January 21,
     2000.

 (3) Incorporated by reference from the Registration Statement on Form S-3 (File
     No. 333-542) of Arch Communications Group, Inc.
                                      II-3
<PAGE>   412

 (4) Incorporated by reference from the Current Report on Form 8-K of Arch
     Communications Group, Inc. dated October 13, 1995 and filed on October 24,
     1995.

 (5) Incorporated by reference from the Current Report on Form 8-K of Arch
     Communications Group, Inc. dated June 26, 1998 and filed on July 23, 1998.

 (6) Incorporated by reference from the Registration Statement on Form S-1 (File
     No. 33-72646) of Arch Communications, Inc.

 (7) Incorporated by reference from the Registration Statement on Form S-1 (File
     No. 33-85580) of Arch Communications, Inc.

 (8) A Confidential Treatment Request has been filed with respect to portions of
     this exhibit so incorporated by reference.

 (9) Incorporated by reference from Registration Statement on Form S-1 (File No.
     333-79769) of Arch Communications Group, Inc.

(10) Incorporated by reference from the Annual Report on Form 10-K of Arch
     Communications Group. Inc. (then known as USA Mobile Communications, Inc.
     II) for the fiscal year ended December 31, 1994.

(11) Incorporated by reference from the Registration Statement on Form S-4 (File
     No. 333-83648) of Arch (then known as USA Mobile Communications, Inc. II).

(12) Incorporated by reference from the Registration Statement on Form S-3 (File
     No. 333-87474) of Arch Communications Group, Inc.

(13) Incorporated by reference from the Annual Report on Form 10-K of Arch
     Communications Group, Inc. for the fiscal year ended December 31, 1995.

(14) Incorporated by reference from the Annual Report on Form 10-K of Arch
     Communications Group, Inc. for the fiscal year ended December 31, 1996.

(15) Incorporated by reference from the Annual Report on Form 10-K of Arch
     Communications Group, Inc. for the fiscal year ended December 31, 1997.

(16) Incorporated by reference from the Current Report on Form 8-K of Arch
     Communications Group, Inc. dated May 14, 1999 and filed on May 20, 1999.

(17) Incorporated by reference from the Registration Statement on Form S-4 (File
     No. 333-63519) of Arch Communications Group, Inc.

ITEM 22.  UNDERTAKINGS

     (a) The undersigned registrant hereby undertakes:

          (1) To file, during any period in which offers or sales are being
     made, a post-effective amendment to this registration statement:

             (i) To include any joint proxy statement/prospectus required by
        Section 10(a)(3) of the Securities Act;

             (ii) To reflect in the joint proxy statement/prospectus any facts
        or events arising after the effective date of the registration statement
        (or most recent post-effective amendment thereof) which, individually or
        in the aggregate, represent a fundamental change in the information set
        forth in the registration statement. Notwithstanding the foregoing, any
        increase or decrease in volume of securities offered (if the total
        dollar value of securities offered would not exceed that which was
        registered) and any deviation from the low or high end of the estimated
        maximum offering range may be reflected in the form of joint proxy
        statement/prospectus filed with the SEC pursuant to Rule 424(b) if, in
        the aggregate, the changes in volume and price represent no more than
        20% change in the maximum aggregate offering price set forth in the
        "Calculation of Registration Fee" table in the effective registration
        statement.

                                      II-4
<PAGE>   413

             (iii) To include any material information with respect to the plan
        of distribution not previously disclosed in the registration statement
        or any material change to such information in the registration
        statement; provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii)
        do not apply if the registration statement is on Form S-3, Form S-8 or
        Form F-3, and the information required to be included in a
        post-effective amendment by those paragraphs is contained in periodic
        reports filed with or furnished to the SEC by the registrant pursuant to
        Section 13 or 15(d) of the Exchange Act that are incorporated by
        reference in the registration statement.

          (2) That, for the purpose of determining any liability under the
     Securities Act, each such post-effective amendment shall be deemed to be a
     new registration statement relating to the securities offered therein, and
     the offering of such securities at that time shall be deemed to the initial
     bona fide offering thereof.

          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.

          (4) If the registration is a foreign private issuer, to file a
     post-effective amendment to the registration statement to include any
     financial statements required by Rule 3-19 of this chapter at the start of
     any delayed offering or throughout a continuous offering. Financial
     statements and information otherwise required by Section 10(a)(3) of the
     Securities Act need not be furnished, provided, that the registrant
     includes in the joint proxy statement/prospectus, by means of a
     post-effective amendment, financial statements required pursuant to this
     paragraph (a)(4) and other information necessary to ensure that all other
     information in the joint proxy statement/prospectus is at least as current
     as the date of those financial statements. Notwithstanding the foregoing,
     with respect to registration statements on Form F-3, a post-effective
     amendment need not be filed to include financial statements and information
     required by Section 10(a)(3) of the Securities Act or Rule 3-19 of this
     chapter if such financial statements and information are contained in
     periodic reports filed with or furnished to the SEC by the registrant
     pursuant to Section 13 or Section 15(d) of the Exchange Act that are
     incorporated by reference in the Form F-3.

     (b) The undersigned registrant hereby undertakes as follows: that prior to
any public reoffering of the securities registered hereunder through use of a
joint proxy statement/prospectus which is a part of this registration statement,
by any person or party who is deemed to be an underwriter within the meaning of
Rule 145(c), the issuer undertakes that such offering joint proxy
statement/prospectus will contain the information called for by the applicable
registration form with respect to reofferings by persons who may be deemed
underwriters, in addition to the information called for by the other items of
the applicable form.

     (c) The registrant undertakes that every joint proxy statement/prospectus:
(1) that is filed pursuant to paragraph (1) immediately preceding, or (ii) that
purports to meet the requirements of Section 10(a)(3) of the Securities Act and
is used in connection with an offering of securities subject to Rule 415, will
be filed as a part of an amendment to the registration statement and will not be
used until such amendment is effective, and that, for purposes of determining
any liability under the Securities Act, each such post-effective amendment shall
be deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

     (d) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to section 13(a) or section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to section 15(d) of the Exchange Act) that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (e) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or

                                      II-5
<PAGE>   414

otherwise, the registrant has been advised that in the opinion of the SEC such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the registrant of expenses
incurred or paid by a director, officer or controlling person of a registrant in
the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.

     (f) The registrant undertakes to respond to requests for information that
is incorporated by reference into the joint proxy statement/prospectus pursuant
to Items 4, 10(b), 11, or 13 of this form, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This includes information contained in documents
filed subsequent to the effective date of this Registration Statement through
the date of responding to the request.

     (g) The registrant undertakes to supply by means of a post-effective
amendment all information concerning a transaction, and the company being
acquired involved therein, that was not the subject of and included in the
Registration Statement when it became effective.

                                      II-6
<PAGE>   415

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act, the Registrant has duly
caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Westborough, Commonwealth
of Massachusetts on January 27, 2000.

                                          Arch Communications Group, Inc.

                                          By:   /s/ C. EDWARD BAKER, JR.
                                            ------------------------------------
                                              C. Edward Baker, Jr. Chairman of
                                              The Board and Chief Executive
                                              Officer

                        SIGNATURES AND POWER OF ATTORNEY

     Each person whose signature appears below hereby constitutes and appoints
J. Roy Pottle, Gerald J. Cimmino and David A. Westenberg as his or her true and
lawful attorneys-in-fact and agents, with full power of substitution and
resubstitution, for him and in his name, place and stead, in any and all
capacities, to sign any and all amendments (including post-effective amendments
and any Registration Statement pursuant to Rule 462(b)) to this Registration
Statement on Form S-4 and to file the same with all exhibits thereto and any
other documents in connection therewith, with the Securities and Exchange
Commission under the Securities Act of 1933, as amended, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing necessary or desirable to be done in
and about the premises, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or any of them, or their or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
                     SIGNATURE                                    TITLE                      DATE
                     ---------                                    -----                      ----

<S>                                                  <C>                               <C>
             /s/ C. EDWARD BAKER, JR.                Chairman of the Board and Chief   January 27, 2000
- ---------------------------------------------------  Executive Officer, Director
               C. Edward Baker, Jr.                  (principal executive officer)

                 /s/ J. ROY POTTLE                   Executive Vice President and      January 27, 2000
- ---------------------------------------------------  Chief Financial Officer
                   J. Roy Pottle                     (principal financial officer and
                                                     principal accounting officer)

               /s/ R. SCHORR BERMAN                  Director                          January 27, 2000
- ---------------------------------------------------
                 R. Schorr Berman

                                                     Director                          January   , 2000
- ---------------------------------------------------
James S. Hughes

                /s/ JOHN KORNREICH                   Director                          January 27, 2000
- ---------------------------------------------------
                  John Kornreich

               /s/ ALLAN L. RAYFIELD                 Director                          January 27, 2000
- ---------------------------------------------------
                 Allan L. Rayfield
</TABLE>

                                      II-7
<PAGE>   416

<TABLE>
<CAPTION>
                     SIGNATURE                                    TITLE                      DATE
                     ---------                                    -----                      ----

<S>                                                  <C>                               <C>
                /s/ JOHN B. SAYNOR                   Director                          January 27, 2000
- ---------------------------------------------------
                  John B. Saynor

                 /s/ JOHN A. SHANE                   Director                          January 27, 2000
- ---------------------------------------------------
                   John A. Shane

                /s/ EDWIN M. BANKS                   Director                          January 27, 2000
- ---------------------------------------------------
                  Edwin M. Banks

                /s/ H. SEAN MATHIS                   Director                          January 27, 2000
- ---------------------------------------------------
                  H. Sean Mathis
</TABLE>

                                      II-8
<PAGE>   417

                                 EXHIBIT INDEX

     (A) Exhibits

<TABLE>
<C>      <S>
  2.1    Agreement and Plan of Merger, dated as of November 7, 1999,
         among Paging Network, Inc., Arch Communications Group, Inc.
         and St. Louis Acquisition Corp.(1)
  2.2    Amendment to Agreement and Plan of Merger, dated as of
         January 7, 2000, between Paging Network, Inc., Arch
         Communications Group, Inc. and St. Louis Acquisition
         Corp.(2)
  3.1    Restated Certificate of Incorporation.(3)
  3.2    Certificate of Designations establishing the Series B Junior
         Participating Preferred Stock, filed with the Secretary of
         State of Delaware on October 19, 1995.(4)
  3.3    Certificate of Correction, filed with the Secretary of State
         of Delaware on February 15, 1996.(3)
  3.4    Certificate of Designations establishing the Series C
         Convertible Preferred Stock, filed with the Secretary of
         State of Delaware on June 29, 1998.(5)
  3.5    Certificate of Amendment of Restated Certificate of
         Incorporation, filed with the Secretary of State of Delaware
         on June 4, 1996.
  3.6    Certificate of Amendment of Restated Certificate of
         Incorporation, filed with the Secretary of State of Delaware
         on May 27, 1999.
  3.7    Certificate of Amendment of Restated Certificate of
         Incorporation, filed with the Secretary of State of Delaware
         on June 16, 1999.
  3.8    By-laws, as amended.(3)
  4.1    Indenture, dated February 1, 1994, between Arch
         Communications, Inc. formerly known as USA Mobile
         Communications, Inc. II) and United States Trust Company of
         New York, as Trustee, relating to the 9 1/2% Senior Notes
         due 2004 of Arch Communications, Inc.(6)
  4.2    Indenture, dated December 15, 1994, between Arch
         Communications, Inc. formerly known as USA Mobile
         Communications, Inc. II) and United States Trust Company of
         New York, as Trustee, relating to the 14% Senior Notes due
         2004 of Arch Communications, Inc.(7)
  4.3    Indenture, dated June 29, 1998, between Arch Communications,
         Inc. and U.S. Bank Trust National Association, as Trustee,
         relating to the 12 3/4% Senior Notes due 2007 of Arch
         Communications, Inc.(5)
  5.1*   Opinion of Hale and Dorr LLP
  8.1*   Tax opinion of Hale and Dorr LLP
  8.2*   Tax opinion of Mayer, Brown & Platt LLP
 10.1    Second Amended and Restated Credit Agreement (Tranche A and
         Tranche C (Facilities), dated June 29, 1998, among Arch
         Paging, Inc., the Lenders party thereto, The Bank of New
         York, Royal Bank of Canada and Toronto Dominion (Texas),
         Inc.(5)
 10.2    Second Amended and Restated Credit Agreement (Tranche B
         Facility), dated June 29, 1998, among Arch Paging, Inc., the
         Lenders party thereto. The Bank of New York, Royal Bank of
         Canada and Toronto Dominion (Texas), Inc.(5)
 10.3    Asset Purchase and Sale Agreement, dated April 10, 1998,
         among OmniAmerica, Inc. and certain subsidiaries of Arch
         Communications Group, Inc.(5)
 10.4    Letter agreement, dated June 10, 1998, between Arch
         Communications Group, Inc. and Motorola, Inc.(5)(8)
 10.5    Debtors' Third Amended Joint Plan of Reorganization, dated
         as of December 1, 1998.(9)
</TABLE>
<PAGE>   418

<TABLE>
<S>        <C>
   10.9*   Registration Rights Agreement among Arch Communications Group, Inc. and W.R. Huff Asset Management Co.,
           L.L.C., The Northwestern Mutual Life Insurance Company, Northwestern Mutual Series Fund, Inc., Credit
           Suisse First Boston Corporation and Whippoorwill Associates, Inc.
   10.10*  Registration Rights Agreement among Arch Communications Group, Inc. and certain Stockholders October 13,
           1995
   10.11   Amendment No. 1 to Rights Agreement, dated June 29, 1998, between Arch Communications Group, Inc. and
           the Bank of New York.(5)
   10.12   Amendment No. 2 to Rights Agreement, dated as of August 18, 1998 amending the Rights Agreement between
           Arch Communications Group, Inc. and the Bank of New York.(17)
   10.13   Amendment No. 3 to Rights Agreement, dated September 3, 1998, amending the Rights Agreement between Arch
           Communications Group, Inc. and the Bank of New York.
   10.14   Amendment No. 4 to Rights Agreement, dated May 14, 1999, amending the Rights Agreement between Arch
           Communications Group, Inc. and the Bank of New York.(16)
   10.15   Amendment No. 5 to Rights Agreement, dated November 15, 1999, amending the Rights Agreement between Arch
           Communications Group, Inc. and the Bank of New York.(1)
   10.16   Warrant Agreement, between Arch Communications Group, Inc. and the Bank of New York, as provided for in
           the First Amendment to Agreement and Plan of Merger dated as of September 3, 1998, by and among Arch
           Communications Group, Inc, Farm Team Corp. and MobileMedia Communications Inc.
   10.17   Commitment Letter, dated as of August 18, 1998, by and among Arch Paging, Inc. and The Bank of New York,
           BNY Capital Markets, Inc., Toronto Dominion (Texas) Inc., TD Securities (USA) Inc., Royal Bank of Canada
           and Barclays Bank PLC amending the Second and Amended Restated Credit Agreements, dated June 29, 1998
           (Tranche A, B and C Facilities).
   10.19   Amendment No. 1 to Registration Rights Agreement, dated August 19, 1998, amending the Registration
           Rights Agreement dated as of June 29, 1998 by and among Arch Communications Group, Inc. and the Sandler
           Capital Partners IV, LP, Sandler Capital Partners IV, FTE LP, South Fork Partners, The Georgica
           International Fund Limited, Aspen Partners and Consolidated Press International Limited.(17)
  +10.20   Amended and Restated Stock Option Plan(10)
  +10.21   Non-Employee Directors' Stock Option Plan(11)
  +10.22   1989 Stock Option Plan, as amended(3)
  +10.23   1995 Outside Directors' Stock Option Plan(12)
  +10.24   1996 Employee Stock Purchase Plan(13)
  +10.25   1997 Stock Option Plan(14)
  +10.26   Deferred Compensation Plan for Nonemployee Directors(15)
  +10.27   Form of Executive Retention Agreement by and between Messrs. Baker, Daniels, Kuzia, Pottle and
           Saynor(15)
   10.28   Stock Purchase Agreement, dated June 29, 1998, among Arch Communications Group, Inc., Sandler Capital
           Partners IV, L.P., Sandler Capital Partners IV FTE, L.P., Harvey Sandler, John Kornreich, Michael J.
           Marocco, Andrew Sandler, South Fork Partners, the Georgica International Fund Limited, Aspen Partners
           and Consolidated Press International Limited(5)
   10.29   Registration Rights Agreement, dated June 29, 1998, among Arch Communications Group, Inc., Sandler
           Capital Partners IV, L.P., Sandler Capital Partners IV FTE, L.P., Harvey Sandler, John Kornreich,
           Michael J. Marocco, Andrew Sandler, South Fork Partners, The Georgica International Fund Limited, Aspen
           Partners and Consolidated Press International Limited(5)
   10.30   Exchange Agreement, dated June 29, 1998, between Adelphia Communications Corporation and Benbow PCS
           Ventures, Inc.(5)
</TABLE>
<PAGE>   419

<TABLE>
<S>        <C>
   10.31   Promissory Note, dated June 29, 1998, in the Principal amount of $285,015, issued by Benbow PCS
           Ventures, Inc. to Lisa-Gaye Shearing(5)
   10.32   Guaranty, dated June 29, 1998, given by Arch Communications Group, Inc. to Adelphia Communications
           Corporation(5)
   10.33   Guaranty, dated June 29, 1998, given by Arch Communications Group, Inc. to Lisa-Gaye Shearing(5)
   10.34   Registration Rights Agreement, dated June 29, 1998, among Arch Communications Group, Inc., Adelphia
           Communications Corporation and Lisa-Gaye Shearing(5)
   21.1*   Subsidiaries of the Registrant
   23.1**  Consent of Arthur Andersen LLP
   23.2**  Consent of Ernst & Young LLP
   23.3**  Consent of Wilkinson, Barker, Knauer & Quinn, LLP
   23.4**  Consent of Ernst and Young LLP
   23.5*   Consent of Hale and Dorr LLP (contained in its opinion filed as Exhibits 5.1 and 8.1)
   23.6*   Consent of Mayer, Brown & Platt LLP (contained in its opinion filed as Exhibit 8.2)
   23.7*   Consent of Bear, Stearns & Co.
   23.8*   Consent of Houlihan, Lokey, Howard & Zukin Capital
   23.9*   Consent of Goldman, Sachs & Co.
   23.10*  Consent of Morgan Stanley Dean Witter
   24.1    Power of Attorney (included on signature page to this Registration Statement)
   27.1*   Financial Data Schedule
   99.1*   Form of Proxy for Arch Annual Meeting
</TABLE>

- ---------------
  *  To be filed by amendment.

 **  Filed herewith.

  +  Identifies exhibits constituting a management contract or compensation
     plan.

 (1) Incorporated by reference from the Current Report on Form 8-K of Arch
     Communications Group, Inc. dated November 7, 1999 and filed on November 19,
     1999.

(2) Incorporated by reference from the Current Report on Form 8-K of Arch
    Communications Group, Inc. dated January 7, 2000 and filed January 21, 2000.

 (3) Incorporated by reference from the Registration Statement on Form S-3 (File
     No. 333-542) of Arch Communications Group, Inc.

 (4) Incorporated by reference from the Current Report on Form 8-K of Arch
     Communications Group, Inc. dated October 13, 1995 and filed on October 24,
     1995.

 (5) Incorporated by reference from the Current Report on Form 8-K of Arch
     Communications Group, Inc. dated June 26, 1998 and filed on July 23, 1998.

 (6) Incorporated by reference from the Registration Statement on Form S-1 (File
     No. 33-72646) of Arch Communications, Inc.

 (7) Incorporated by reference from the Registration Statement on Form S-1 (File
     No. 33-85580) of Arch Communications, Inc.

 (8) A Confidential Treatment Request has been filed with respect to portions of
     this exhibit so incorporated by reference.

 (9) Incorporated by reference from Registration Statement on Form S-1 (File No.
     333-79769) of Arch Communications Group, Inc.
<PAGE>   420

(10) Incorporated by reference from the Annual Report on Form 10-K of Arch
     Communications Group. Inc. (then known as USA Mobile Communications, Inc.
     II) for the fiscal year ended December 31, 1994.

(11) Incorporated by reference from the Registration Statement on Form S-4 (File
     No. 333-83648) of Arch (then known as USA Mobile Communications, Inc. II).

(12) Incorporated by reference from the Registration Statement on Form S-3 (File
     No. 333-87474) of Arch Communications Group, Inc.

(13) Incorporated by reference from the Annual Report on Form 10-K of Arch
     Communications Group, Inc. for the fiscal year ended December 31, 1995.

(14) Incorporated by reference from the Annual Report on Form 10-K of Arch
     Communications Group, Inc. for the fiscal year ended December 31, 1996.

(15) Incorporated by reference from the Annual Report on Form 10-K of Arch
     Communications Group, Inc. for the fiscal year ended December 31, 1997.

(16) Incorporated by reference from the Current Report on Form 8-K of Arch
     Communications Group, Inc. dated May 14, 1999 and filed on May 20, 1999.

(17) Incorporated by reference from the Registration Statement on Form S-4 (File
     No. 333-63519) of Arch Communications Group, Inc.

<PAGE>   1

                                                                    EXHIBIT 23.1

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

     As independent public accountants, we hereby consent to the use of our
report dated February 24, 1999 (except with respect to the matters discussed in
Note 12, as to which the date is June 28, 1999) included herein and to all
references to our firm included in this registration statement.

                                          /s/ ARTHUR ANDERSEN LLP
                                          --------------------------------------
                                          ARTHUR ANDERSEN LLP
Boston, Massachusetts
January 26, 2000

<PAGE>   1

                                                                    EXHIBIT 23.2

                        CONSENT OF INDEPENDENT AUDITORS

     We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated February 15, 1999, with respect to the consolidated
financial statements of Paging Network, Inc. as of December 31, 1997 and 1998,
and for each of the three years in the period ended December 31, 1998, in the
Joint Proxy Statement of Arch Communications Group, Inc. and Paging Network,
Inc. that is made a part of the Registration Statement (Form S-4) and Prospectus
of Arch Communications Group, Inc. for the registration of shares of common
stock of Arch Communications Group, Inc. to be exchanged for all the outstanding
common stock of Paging Network, Inc. (the Registration Statement).

     We also consent to the use of our report dated February 12, 1999, except
for the eighth paragraph of Note 1, and the second paragraph of Note 6, as to
which the date is March 26, 1999, and the ninth paragraph of Note 1, as to which
the date is April 12, 1999, with respect to the financial statements of
MobileMedia Communications, Inc. as of December 31, 1997 and 1998, and for each
of the three years in the period ended December 31, 1998, in the Registration
Statement.

     We also consent to the reference to our firm under the caption "Experts"
and to the use of our report dated December 23, 1999 with respect to the
financial statements of Silverlake Communications, Inc. as of December 31, 1997
and December 9, 1998, and for the year ended December 31, 1997 and the period
January 1, 1998 through December 9, 1998, in Annex F to the Registration
Statement.

                                          /s/ ERNST & YOUNG LLP

Dallas, Texas
January 24, 2000

<PAGE>   1

                                                                    EXHIBIT 23.3

                                    CONSENT

     We hereby consent to the reference to our firm under the section labeled
"Experts" in the Joint Proxy Statement Prospectus of Arch Communications Group,
Inc. ("Arch") and Paging Network, Inc. filed on Form S-4 (File Number
333-xxxxx). As noted therein, our review and input only pertains to FCC matters
unique to Arch included in the description of the regulatory requirements under
the Communications Act and the Telecommunications Act of 1996, and the
regulations thereunder, set forth under "Risk Factors -- Government regulation
may burden operations", "The Merger -- Regulatory Approvals" and "Industry
Overview -- Regulation." Stockholders of Arch should not rely on Wilkinson
Barker Knauer, LLP with respect to any other matters or any other sections of
the document.

                                          WILKINSON BARKER KNAUER, LLP

                                          By: /s/  KENNETH D. PATRICH
                                            ------------------------------------
                                              Kenneth D. Patrich

Date: January 27, 2000

<PAGE>   1

                                                                    EXHIBIT 23.4

                        CONSENT OF INDEPENDENT AUDITORS

     We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated January 5, 1999 with respect to the financial
statements of Vast Solutions, Inc., a wholly owned subsidiary of Paging Network,
Inc., as of December 31, 1998 and September 30, 1999, and for the period
September 1, 1998 (inception) through December 31, 1998, the nine months ended
September 30, 1999, and the period September 1, 1998 (inception) through
September 30, 1999, in Annex F to in the Joint Proxy Statement of Arch
Communications Group, Inc. and Paging Network, Inc. that is made a part of the
Registration Statement (Form S-4) and Prospectus of Arch Communications Group,
Inc. for the registration of shares of common stock of Arch Communications
Group, Inc. to be exchanged for all the outstanding common stock of Paging
Network, Inc.

                                          ERNST & YOUNG, LLP

Dallas, Texas
            , 2000

     The foregoing consent is in the form that will be signed upon the transfer
of certain intellectual and other property by Paging Network, Inc. to Vast
Solutions, Inc. as described in Note 1 to the financial statements of Vast
Solutions, Inc.

                                          /s/ ERNST & YOUNG, LLP

Dallas, Texas
January 24, 2000


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission