MOBILEMEDIA CORP
8-K, 1998-09-17
RADIOTELEPHONE COMMUNICATIONS
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 8-K
                                 CURRENT REPORT

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

      Date of Report (Date of earliest event reported): September 17, 1998

                             MOBILEMEDIA CORPORATION
             (Exact name of registrant as specified in its charter)

         Delaware                  0-26320                  22-3253006
     (State or other         (Commission File No.)         (IRS Employer
      jurisdication                                     Identification No.)
    of incorporation)

            Fort Lee Executive Park, One Executive Drive, Suite 500,
                           Fort Lee, New Jersey 07024
                    (Address of principal executive offices)
                                   (Zip Code)

                                 (201) 224-9200
              (Registrant's telephone number, including area code)


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

        (Former name or former address, if changed since last report)


================================================================================
<PAGE>

Item 5.  Other Events.

            MobileMedia Corporation and MobileMedia Communications, Inc.
(collectively, "MobileMedia") entered into an agreement and plan of merger dated
as of August 18, 1998 with Arch Communications Group, Inc. ("Arch") and Farm
Team Corp. for Arch to acquire MobileMedia. The agreement and plan of merger was
amended by a first amendment to agreement and plan of merger dated as of
September 3, 1998 among MobileMedia Corporation, MobileMedia Communications,
Inc., Arch Communications Group, Inc. and Farm Team Corp.

            Under the terms of the agreement, Arch will acquire MobileMedia for
a combination of cash, the assumption of certain liabilities, and the issuance
of Arch common stock and warrants to acquire Arch common stock. The merger
transaction will be implemented through the plan of reorganization MobileMedia
filed with the U.S. Bankruptcy Court for the District of Delaware. Subject to
various closing conditions, the transaction is expected to close during the
first quarter of 1999.


















                                       2
<PAGE>

            Pursuant to the requirements of the Securities Exchange Act of 1934,
as amended, the registrant has duly caused this report to be signed on its
behalf by the undersigned hereunto duly authorized.

Date:   September 17, 1998          MOBILEMEDIA CORPORATION

                                    By: /s/ David R. Gibson
                                        ----------------------------
                                        David R. Gibson
                                        Senior Vice President and
                                        Chief Financial Officer


                                       3
<PAGE>

                                  EXHIBIT INDEX

Exhibit No.                                                 Page
- -----------                                                 ----

EX-99.1     Agreement and Plan of Merger

EX-99.2     First Amendment to Agreement and 
              Plan of Merger















                                       4



                          AGREEMENT AND PLAN OF MERGER

                                  by and among

                        Arch Communications Group, Inc.,

                                Farm Team Corp.,

                             MobileMedia Corporation

                                       and

                        MobileMedia Communications, Inc.






                           Dated as of August 18, 1998
<PAGE>

                                TABLE OF CONTENTS

                                                                            Page


                                    ARTICLE I

                                   THE MERGER

1.1   The Merger; Effective Time............................................. 2
1.2   The Closing............................................................ 3
1.3   Actions at the Closing................................................. 3
1.4   Additional Action...................................................... 4
1.5   Conversion of Securities............................................... 4
1.6   Appointment of Exchange Agent; Distributions in                         
      Accordance with Amended Plan........................................... 4
1.7   Distribution to Holders of Buyer Common Stock.......................... 4
1.8   Certificate of Incorporation........................................... 5
1.9   By-laws................................................................ 5
1.10  Directors and Officers................................................. 5
1.11  Payment of Administrative Claims and Expenses.......................... 5
                                                                              

                                   ARTICLE II

          REPRESENTATIONS AND WARRANTIES OF THE PARENT AND THE COMPANY

2.1   Organization, Qualification, Corporate Power and Authority............  6
2.2   Capitalization........................................................  7
2.3   Noncontravention......................................................  7
2.4   Business Entities.....................................................  8
2.5   Financial Statements; Accounts Receivable; Inventory..................  9
2.6   Absence of Certain Changes............................................ 10
2.7   Undisclosed Liabilities............................................... 10
2.8   Tax Matters........................................................... 10
2.9   Tangible Assets....................................................... 12
2.10  Owned Real Property................................................... 12
2.11  Intellectual Property................................................. 13
2.12  Real Property Leases.................................................. 14
2.13  Contracts............................................................. 15
2.14  Licenses and Authorizations........................................... 16
2.15  Litigation............................................................ 17
2.16  Employees............................................................. 18
2.17  Employee Benefits..................................................... 18
                                                                            
                                        i
<PAGE>


                                                                            Page

2.18  Environmental Matters................................................. 20
2.19  Legal Compliance...................................................... 22
2.20  Subscriber Cancellations; Suppliers................................... 22
2.21  Capital Expenditures.................................................. 22
2.22  Brokers' Fees......................................................... 22
2.23  Certain Information................................................... 22
2.24  Disclosure............................................................ 23
                                                                            

                                   ARTICLE III

                   REPRESENTATIONS AND WARRANTIES OF THE BUYER

3.1   Organization Qualification, Corporate Power and Authority............. 23
3.2   Capitalization........................................................ 24
3.3   Noncontravention...................................................... 25
3.4   Business Entities..................................................... 26
3.5   Reports and Financial Statements...................................... 27
3.6   Absence of Certain Changes............................................ 28
3.7   Undisclosed Liabilities............................................... 28
3.8   Tax Matters........................................................... 28
3.9   Tangible Assets....................................................... 30
3.10  Owned Real Property................................................... 30
3.11  Intellectual Property................................................. 30
3.12  Real Property Leases.................................................. 31
3.13  Contracts............................................................. 32
3.14  Licenses and Authorizations........................................... 32
3.15  Litigation............................................................ 34
3.16  Employees............................................................. 34
3.17  Employee Benefits..................................................... 34
3.18  Environmental Matters................................................. 36
3.19  Legal Compliance...................................................... 37
3.20  Merger Subsidiary..................................................... 37
3.21  Capital Expenditures; Suppliers....................................... 38
3.22  Brokers' Fees......................................................... 38
3.23  Rights Agreement; Section 203......................................... 38
3.24  Opinion of Financial Advisor.......................................... 38
3.25  Required Vote of the Buyer's Stockholders............................. 38
3.26  Certain Information................................................... 38
3.27  Disclosure............................................................ 39
                                                                            
                                       ii
<PAGE>

                                                                            Page

                                   ARTICLE IV

                                    COVENANTS

4.1   Best Efforts.......................................................... 39
4.2   Approvals; Consents................................................... 39
4.3   Buyer Not To Control.................................................. 40
4.4   Bankruptcy Covenants.................................................. 41
4.5   Operation of Business................................................. 42
4.6   Notice of Breaches.................................................... 46
4.7   Exclusivity........................................................... 46
4.8   Breakup Fee Provisions................................................ 48
4.9   Nasdaq National Market Quotation...................................... 49
4.10  Delivery of Financial Statements...................................... 50
4.11  Full Access........................................................... 50
4.12  Stockholders Approval; Meeting........................................ 50
4.13  Proxy Statement, Disclosure Statement, Etc............................ 51
4.14  Application of Pinnacle Proceeds...................................... 51
4.15  FCC Filing............................................................ 52
4.16  Indemnification; Director and Officers Insurance...................... 53
4.17  State Takeover Laws................................................... 53
4.18  Employees............................................................. 53
4.19  Rights Agreement...................................................... 54
4.20  Buyer Rights Offering; Registration Statement......................... 55
4.21  Reimbursement of Buyer's Expenses..................................... 56
                                                                             
                                                                             
                                 ARTICLE V                                   
                                                                             
                           CONDITIONS TO CLOSING                             
                                                                             
5.1   Conditions to Obligations of Each Party............................... 56
5.2   Conditions to Obligations of the Buyer................................ 59
5.3   Conditions to Obligations of the Company.............................. 60
                                                                             
                                                                             
                                ARTICLE VI                                   
                                                                             
                                TERMINATION                                  
                                                                             
6.1   Termination of Agreement.............................................. 61
6.2   Effect of Termination................................................. 63

                                       iii
<PAGE>

                                                                            Page

                                   ARTICLE VII

                                   DEFINITIONS



                                  ARTICLE VIII

                               GENERAL PROVISIONS

8.1   Press Releases and Announcements......................................  68
8.2   No Third Party Beneficiaries..........................................  68
8.3   Entire Agreement......................................................  68
8.4   Succession and Assignment.............................................  68
8.5   Counterparts..........................................................  68
8.6   Headings..............................................................  68
8.7   Notices...............................................................  69
8.8   Governing Law.........................................................  70
8.9   Amendments and Waivers................................................  70
8.10  Severability..........................................................  70
8.11  Expenses..............................................................  70
8.12  Specific Performance..................................................  70
8.13  Construction..........................................................  70
8.14  Incorporation of Exhibits and Schedules...............................  70
8.15  Knowledge.............................................................  70
8.16  Survival of Representations...........................................  71
8.17  Bankruptcy Process....................................................  71

                                       iv
<PAGE>

LIST OF EXHIBITS
- ----------------


EXHIBIT A             First Amended Joint Plan of Reorganization
EXHIBIT B             Buyer Warrant Agreement
EXHIBIT C             Registration Rights Agreement
EXHIBIT D             Amendment to Buyer's Rights Agreement
EXHIBIT E             Opinion of Buyer's Financial Advisor
EXHIBIT F             Buyer Charter Amendment
EXHIBITS G, H, I      Standby Purchase Commitments
J, K & L


LIST OF SCHEDULES
- -----------------


SCHEDULE              Subsidiaries of the Company
SCHEDULE II           Pricing Mechanism
SCHEDULE III          Terms of Rights
<PAGE>

                          AGREEMENT AND PLAN OF MERGER

            This Agreement and Plan of Merger (this "Agreement") entered into as
of August 18, 1998 (the date of this Agreement or the "Agreement Date") by and
among Arch Communications Group, Inc., a Delaware corporation (the "Buyer"),
Farm Team Corp., a Delaware corporation and a wholly-owned subsidiary of Buyer
(the "Merger Subsidiary"), MobileMedia Corporation, a Delaware corporation (the
"Parent"), and MobileMedia Communications, Inc., a Delaware corporation and a
wholly-owned subsidiary of the Parent (the "Company" and, together with the
Buyer, the Merger Subsidiary and the Parent, the "Parties").

                              Preliminary Statement

            A.    The Parent, the Company and those subsidiaries of the Company
set forth in Schedule I attached hereto (collectively, the "Debtors" and each,
individually, a "Debtor") are debtors in possession in Chapter 11 cases (Case
Nos. 97-174 (PJW) through and including 97-192 (PJW)) (collectively the "Chapter
11 Proceeding") pending before the United States Bankruptcy Court for the
District of Delaware (the "Bankruptcy Court"). The Debtors have previously filed
a proposed Joint Plan of Reorganization dated January 27, 1998 (the "Prior
Plan") with the Bankruptcy Court.

            B.    This Agreement contemplates a merger of the Company into the
Merger Subsidiary. As a result of such merger, the separate corporate existence
of the Company shall cease and the Merger Subsidiary shall continue as the
Surviving Corporation (as defined in Section 1.1). For federal income tax
purposes, it is intended that such merger will qualify as a reorganization under
the provisions of Section 368(a)(2)(D) of the Internal Revenue Code of 1986, as
amended (the "Code").

            C.    The merger contemplated by this Agreement shall constitute the
basis for the Debtor's First Amended Joint Plan of Reorganization in the form
attached hereto as Exhibit A, as amended from time to time as permitted hereby
and thereby (the "Amended Plan"). Pursuant to the Amended Plan, which shall be
filed with the Bankruptcy Court as soon as practicable after the date of this
Agreement (but not later than August 20, 1998 in any event): (i) all the
outstanding equity interests in the Company and the Parent shall be canceled
without consideration, and the Parent shall be dissolved; (ii) all allowed
prepetition claims against, and prepetition obligations and indebtedness of, the
Debtors (the "Allowed Claims") shall be (a) satisfied by the distribution of
cash, shares of capital stock of the Buyer, Rights (as defined in paragraph (E)
below) and/or certain other consideration to the holders of the Allowed Claims
or (b) otherwise discharged; (iii) the commitments under the DIP Loan Agreement
(as defined in Section 1.11) shall be terminated and all amounts owed under or
in respect of the DIP Loan Agreement shall be paid in full in cash; and (iv) the
Merger Subsidiary shall remain a wholly owned subsidiary of the Buyer.

            D.    This Agreement contemplates that the Buyer shall cause the
Surviving Corporation (as defined in Section 1.1) to pay or assume all allowed
administrative and priority claims and expenses of the Debtors and shall make
available to the Surviving Corporation the monies necessary for the timely
payment thereof.
<PAGE>

            E.    In connection with the Merger (as defined in Section 1.1) and
as part of the Amended Plan, the Buyer intends to conduct the Rights Offering
(as defined in Section 4.20), in which it will issue to holders of certain
Allowed Claims transferable Rights to purchase (i) shares of Common Stock, $0.01
par value per share, of the Buyer ("Buyer Common Stock") or shares of Buyer
Class B Common Stock, if applicable, and (ii) warrants to purchase shares of
Buyer Common Stock ("Buyer Warrants"), such Buyer Warrants to be issued pursuant
to a warrant agreement in the form attached hereto as Exhibit B (the "Buyer
Warrant Agreement"). Contemporaneously with the execution and delivery of this
Agreement, certain holders of Allowed Claims (the "Standby Purchasers") are
making certain commitments in connection with the Rights Offering (the "Standby
Purchase Commitments"), copies of which are attached as Exhibits G, H, I, J, K &
L hereto. In partial consideration for the Standby Purchase Commitments, the
Buyer will issue to the Standby Purchasers certain Buyer Warrants, and in
connection with the Standby Purchase Commitments the Buyer and the Standby
Purchasers will enter into a registration rights agreement in the form attached
hereto as Exhibit C (the "Registration Rights Agreement").

            F.    Immediately following the Merger, the Buyer will issue
additional Buyer Warrants to the stockholders of the Buyer that were holders of
record immediately prior to such Merger.

            G.    The transactions contemplated by this Agreement, including the
Merger, shall be consummated pursuant to the Amended Plan as confirmed by an
order of the Bankruptcy Court entered pursuant to Section 1129 of the Bankruptcy
Code (as defined in Section 2.1(a)) (the "Confirmation Order"). Unless otherwise
defined herein, capitalized terms used herein shall have the meanings ascribed
to them in the Amended Plan.

            NOW, THEREFORE, in consideration of the representations, warranties
and covenants contained herein and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Parties further
agree as follows:


                                    ARTICLE I

                                   THE MERGER


            1.1   The Merger; Effective Time. Upon the terms and subject to the
conditions of this Agreement and in accordance with the Delaware General
Corporation Law (the "DGCL"), the Company shall merge with and into the Merger
Subsidiary (such merger being referred to herein as the "Merger") at the
Effective Time (as defined below in this Section 1.1). The Merger shall have the
effects set forth in Section 259 of the DGCL. At the Effective Time, the
separate corporate existence of the Company shall cease and thereafter the
Merger Subsidiary shall continue as the surviving corporation in the Merger (the
"Surviving Corporation"), and all the rights, privileges, immunities, powers and
franchises (of a public as well as of a private nature) of the Company and the

                                        2
<PAGE>

Merger Subsidiary and all property (real, personal and mixed) of the Company and
the Merger Subsidiary shall vest in the Surviving Corporation. The "Effective
Time" shall be the time at which the Company and the Merger Subsidiary file a
certificate of merger or other appropriate documents prepared and executed in
accordance with the relevant provisions of the DGCL (the "Certificate of
Merger") with the Secretary of State of the State of Delaware or such later time
as may be specified in the Certificate of Merger.

            1.2   The Closing. Unless this Agreement shall have been terminated
pursuant to Article VI hereof, the closing of the transactions contemplated by
this Agreement (the "Closing") shall take place at the offices of Hale and Dorr
LLP, 60 State Street, Boston, Massachusetts 02109, commencing at 10:00 a.m.,
local time, on a date to be mutually agreed by the Company and the Buyer, which
date shall be at least seven, but no more than ten, business days after the date
upon which all the conditions to the obligations of the Parties to consummate
the transactions contemplated hereby set forth in Section 5.1 (other than
Section 5.1(j)) have first been satisfied or waived, which date shall be the
same date as the Effective Date under the Amended Plan (the "Closing Date");
provided that the Closing shall not occur until the condition set forth in
Section 5.1(j) shall have been satisfied and the conditions set forth in
Sections 5.2 and 5.3 shall have been satisfied or waived.

            1.3   Actions at the Closing. At the Closing, (a) the Parent and the
Company shall deliver to the Buyer and the Merger Subsidiary the various
certificates, instruments and documents referred to in Section 5.2, (b) the
Buyer and the Merger Subsidiary shall deliver to the Company the various
certificates, instruments and documents referred to in Section 5.3, (c) the
Buyer shall file with the Secretary of State of the State of Delaware the Buyer
Charter Amendment (as defined in Section 4.12), (d) the Company and the Merger
Subsidiary shall immediately thereafter file with the Secretary of State of the
State of Delaware the Certificate of Merger, (e) the Buyer shall deliver (x) to
the Pre-Petition Agent, for the benefit of the Pre-Petition Lenders, immediately
available funds equal to the excess of (i) $649,000,000 over (ii) the Company
Tower Sale Proceeds (as defined in Section 5.2(f)), (y) to the Company
immediately available funds when and as required in amounts sufficient to pay
allowed administrative and priority claims and expenses of the Debtors, whether
allowed prior to or after the Effective Time, as set forth in the Amended Plan
(collectively, the "Plan Cash") and (z) to a bank trust company or other entity
reasonably satisfactory to the Company and the Buyer appointed by the Buyer to
act as the exchange agent (the "Exchange Agent") pursuant to Section 1.6(a)
certificates representing an aggregate number of shares of Buyer Common Stock
determined in accordance with the pricing mechanism set forth in Schedule II
attached hereto (the "Plan Shares") to be distributed as contemplated by Section
1.6(b), and the Buyer shall issue the Buyer Common Stock (and Buyer Class B
Common Stock, if applicable) and Buyer Warrants (x) purchased through the
exercise of Rights or (y) purchased by or otherwise issued to the Standby
Purchasers in connection with the Standby Purchase Commitments.

                                       3
<PAGE>

            1.4   Additional Action. The Surviving Corporation may, at any time
after the Effective Time, take any action, including executing and delivering
any document, in the name and on behalf of either the Company or the Merger
Subsidiary, in order to consummate the transactions contemplated by this
Agreement.

            1.5   Conversion of Securities. At the Effective Time, by virtue of
the Merger and the Amended Plan and without any further action on the part of
any person or entity:

            (a)   Each share of common stock, $0.01 par value per share, of the
      Merger Subsidiary issued and outstanding immediately prior to the
      Effective Time shall remain issued and outstanding and shall evidence one
      share of common stock, $0.01 par value per share, of the Surviving
      Corporation.

            (b)   Each share of capital stock of the Parent (collectively, the
      "Company Stock") that is either outstanding or held in the treasury of the
      Parent immediately prior to the Effective Time, each share of capital
      stock of the Company, each share of capital stock of each of the other
      Debtors held by any person or entity other than the Debtors, and each
      option, warrant or other right issued by any of the Debtors to acquire any
      such capital stock and outstanding immediately prior to the Effective Time
      shall be canceled without payment of any consideration therefor and shall
      cease to exist. Pursuant to Section 303 of the DGCL and the Amended Plan,
      holders of the Company Stock shall have no statutory right of appraisal in
      connection with the Merger, and such holders shall have no right to
      approve or disapprove the Merger or this Agreement.

            1.6   Appointment of Exchange Agent; Distributions in Accordance
with Amended Plan.

            (a)   Prior to the Effective Time, the Buyer shall appoint the
Exchange Agent to effect, pursuant to and in accordance with the Amended Plan,
the distribution of Plan Shares in exchange for, and in satisfaction of, certain
Allowed Class 6 Claims.

            (b)   The Buyer and the Surviving Corporation shall cause the
Exchange Agent, promptly after the Effective Time, to commence the distribution
of Plan Shares (which Plan Shares are defined in the Amended Plan as the
"Creditor Stock Pool") to holders of Allowed Class 6 Claims in exchange for, and
in satisfaction of, such Allowed Class 6 Claims, all as provided in the Amended
Plan.

            1.7   Distribution to Holders of Buyer Common Stock.

            (a)   The Buyer shall, as soon as practicable after the receipt of
the Confirmation Order, declare, subject to and effective immediately after the
occurrence of the Effective Time, a distribution of a number of Buyer Warrants
determined in accordance with the Amended Plan on each share of Buyer Common
Stock and the Buyer's Series C Convertible Preferred Stock, $.01 par value

                                       4
<PAGE>

per share (the "Buyer Preferred Stock" and, together with the Buyer Common
Stock, the "Buyer Stock"), outstanding immediately prior to the Effective Time
(the "Buyer Distribution"). The Buyer Distribution shall be made as promptly as
practicable following the Effective Time.

            (b)   Notwithstanding the foregoing, no fractional Buyer Warrants
shall be issued in the Buyer Distribution. In lieu thereof, fractional Buyer
Warrants that would otherwise be issued in the Buyer Distribution will be
rounded up to the nearest whole number of Buyer Warrants.

            1.8   Certificate of Incorporation. From and after the Effective
Time, the Certificate of Incorporation of the Merger Subsidiary, as in effect
immediately prior to the Effective Time (except that the name of the corporation
set forth therein shall be changed to the name of the Company) and as amended by
the Certificate of Merger, shall be the Certificate of Incorporation of the
Surviving Corporation, until thereafter further amended as provided by law and
such Certificate of Incorporation.

            1.9   By-laws. From and after the Effective Time, the By-laws of the
Merger Subsidiary, as in effect immediately prior to the Effective Time (except
that the name of the corporation set forth therein shall be changed to the name
of the Company), shall be the By-Laws of the Surviving Corporation, until
thereafter further amended as provided by law, the Certificate of Incorporation
of the Surviving Corporation and such By-laws.

            1.10  Directors and Officers. From and after the Effective Time, the
directors and officers of the Merger Subsidiary immediately prior to the
Effective Time shall be and continue as directors and officers, respectively, of
the Surviving Corporation as of the Effective Time, until thereafter changed in
accordance with the Certificate of Incorporation and the By-Laws of the
Surviving Corporation.

            1.11  Payment of Administrative Claims and Expenses. At the
Effective Time, the Buyer shall cause the Surviving Corporation to pay or assume
the allowed administrative and priority claims and expenses of the Debtors,
whether allowed prior to or after the Effective Time (including, without
limitation, (a) the payment of obligations under the existing
debtor-in-possession financing facility (the "DIP Loan Agreement") and (b) the
assumption of post-petition trade payables arising in the Ordinary Course of
Business (as defined in Section 2.3)), as specified in the Amended Plan. The
Buyer shall make available to the Surviving Corporation any monies necessary for
the Surviving Corporation to make timely payment of such claims and expenses.

                                       5
<PAGE>

                                   ARTICLE II

          REPRESENTATIONS AND WARRANTIES OF THE PARENT AND THE COMPANY

            Each of the Parent and the Company represents and warrants to the
Buyer that the statements contained in this Article II are true and complete,
except as set forth in the disclosure schedule of the Company delivered to the
Buyer simultaneously with the execution and delivery hereof (the "Company
Disclosure Schedule"). The Company Disclosure Schedule shall be arranged in
sections and paragraphs corresponding to the numbered and lettered sections and
paragraphs contained in this Article II, and the disclosures in any section or
paragraph of the Company Disclosure Schedule shall qualify other sections or
paragraphs in this Article II only to the extent that it is reasonably clear
from a reading of the disclosure that such disclosure is applicable to such
other sections or paragraphs. For purposes of this Agreement, a "Debtor Material
Adverse Effect" shall mean a material adverse effect on the businesses, assets
(including licenses, franchises and other intangible assets), financial
condition, operating income and prospects of the Debtors, taken as a whole,
excluding any effect generally applicable to the economy or the industry in
which the Company conducts its business.

            2.1   Organization, Qualification, Corporate Power and Authority.

            (a)   Each of the Debtors is a corporation duly organized, validly
existing and in good standing under the laws of its jurisdiction of
incorporation. Each of the Debtors is duly qualified to conduct business and is
in good standing under the laws of each jurisdiction (each such jurisdiction
being set forth in Section 2.1(a) of the Company Disclosure Schedule) in which
the nature of its businesses or the ownership or leasing of its properties
requires such qualification, other than where the failure to be so qualified
would not in the aggregate have a Debtor Material Adverse Effect. Subject to
supervision by the Bankruptcy Court in accordance with Title 11 of the United
States Code (the "Bankruptcy Code"), each of the Debtors has all requisite
corporate power and authority to carry on the businesses in which it is engaged
and to own and use the properties owned and used by it. Each of the Debtors has
furnished to the Buyer true and complete copies of its charter and by-laws, each
as amended and as in effect on the date hereof. Each of the Debtors has at all
times complied with, and is not in default under or in violation of, any
provision of its charter or by-laws, other than where the failure to so comply
and such defaults and violations would not in the aggregate have a Debtor
Material Adverse Effect.

            (b)   Subject to the entry of the Initial Merger Order (as defined
in Section 4.4(a)), with respect to the Company Breakup Fee, the Buyer Breakup
Fee and the Buyer Reimbursement (each as defined in Article 4), and subject to
the entry of the Confirmation Order, with respect to the remaining terms and
conditions of this Agreement, each of the Parent and the Company has all
requisite power and authority to execute and deliver this Agreement. Subject to
the entry of the Initial Merger Order, with respect to the Company Breakup Fee,
the Buyer Breakup Fee and the Buyer Reimbursement, and subject to the entry of
the Confirmation Order, with respect to the remaining terms and conditions of
this Agreement, this Agreement has been (i) duly and validly

                                       6
<PAGE>

executed and delivered by the Parent and the Company and (ii) duly and validly
authorized by all necessary corporate action on the part of the Parent and the
Company. Subject to the entry of the Initial Merger Order, with respect to the
Company Breakup Fee, the Buyer Breakup Fee and the Buyer Reimbursement, and
subject to the entry of the Confirmation Order, with respect to the remaining
terms and conditions of this Agreement, this Agreement constitutes a valid and
binding obligation of the Parent and the Company enforceable against the Parent
and the Company in accordance with its terms.

            (c)   Each of the Debtors has the requisite power and authority to
execute and file with the Bankruptcy Court the Amended Plan. The Amended Plan
has been (i) duly and validly executed by each Debtor and (ii) duly and validly
authorized by all necessary corporate action on the part of each Debtor. Upon
the entry of the Confirmation Order, the Amended Plan will constitute a valid
and binding obligation of each Debtor enforceable against each Debtor in
accordance with its terms.

            2.2   Capitalization. On the Closing Date, after giving effect to
the Amended Plan (but immediately prior to the Merger), the authorized capital
stock of each Debtor will be as set forth in Section 2.2 of the Company
Disclosure Schedule. On the Closing Date, after giving effect to the Amended
Plan, there will be no outstanding Company Stock and no outstanding or
authorized options, warrants, rights, calls, convertible instruments, agreements
or commitments to which any of the Debtors is a party or which are binding upon
any of the Debtors providing for the issuance, disposition or acquisition of any
of its capital stock or stock appreciation, phantom stock or similar rights.

            2.3   Noncontravention. Except for the applicable requirements of
the Securities Act of 1933, as amended (the "Securities Act"), the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), any applicable state and
foreign securities laws, the Hart-Scott-Rodino Antitrust Improvements Act of
1976, as amended (the "HSR Act"), the Communications Act of 1934, as amended
(the "Communications Act"), and the regulations of the Federal Communications
Commission (the "FCC"), state public utility, telecommunication or public
service laws, and the Bankruptcy Code, the Confirmation Order and the Amended
Plan, none of the execution and delivery of this Agreement by the Parent and the
Company, the execution and filing with the Bankruptcy Court of the Amended Plan
by the Debtors or the consummation of the transactions contemplated hereby or
thereby will (a) conflict with or violate any provision of the charter or
by-laws of any Debtor; (b) require on the part of any Debtor any filing with, or
any permit, authorization, consent or approval of, any court, arbitrational
tribunal, administrative agency or commission or other governmental or
regulatory authority or agency (a "Governmental Entity"), other than where the
failure to make or obtain such filings, permits, authorizations, consents or
approvals would not in the aggregate have a Debtor Material Adverse Effect or
materially adversely affect the ability of the Reorganized Debtors (which, for
purposes of this Agreement, shall mean the "Reorganized Debtors" as defined in
the Amended Plan, together with "License Co. L.L.C." as defined in the Amended
Plan) to operate the business of the Debtors following the Effective Time; (c)
conflict with, result in a breach of, constitute (with or without due notice or
lapse of time or both) a default under, result in

                                       7
<PAGE>

the acceleration of, create in any party any right to accelerate, terminate,
modify or cancel, or require any notice, consent or waiver under, any
post-petition contract, lease, sublease, license, sublicense, franchise, permit,
indenture, agreement or mortgage for borrowed money, instrument of indebtedness,
Security Interest (as defined below in this Section 2.3) or other arrangement to
which any Debtor is a party or by which any Debtor is bound or to which any of
their respective assets is subject or any judgment, order, writ, injunction,
decree, statute, rule or regulation applicable to any Debtor or any of their
respective properties or assets, other than such conflicts, violations,
breaches, defaults, accelerations, terminations, modifications, cancellations or
notices, consents or waivers as would not in the aggregate have a Debtor
Material Adverse Effect; or (d) result in the imposition of any Security
Interest upon any assets of any Debtor. For purposes of this Agreement,
"Security Interest" means any mortgage, pledge, security interest, encumbrance,
charge or other lien (whether arising by contract or by operation of law), other
than liens arising in the ordinary course of business consistent with past
custom and practice, including with respect to frequency and amount (the
"Ordinary Course of Business").

            2.4   Business Entities.

            (a)   Section 2.4(a) of the Company Disclosure Schedule sets forth a
true and complete list of each corporation, partnership, limited liability
company or other form of business association (a "Business Entity") in which any
Debtor, directly or indirectly, owns any equity interest or any security
convertible into or exchangeable for an equity interest (each a "Debtor Business
Entity") which is material to the Parent and the Company.

            (b)   The Debtor Business Entities listed in Section 2.4(b) of the
Company Disclosure Schedule are the only Debtor Business Entities which have
conducted any operations, trade or businesses of the Debtors since January 30,
1997, hold any Debtor Authorizations (as defined in Section 2.14(a)) or own any
assets necessary for the conduct of the businesses of the Debtors as currently
conducted.

            (c)   The Debtors own all the outstanding equity interests in each
Debtor Business Entity.

            (d)   No Debtor is in default under or in violation of any provision
of its organizational documents. To the knowledge of the Parent or the Company,
all the issued and outstanding equity interests of each Debtor Business Entity
are duly authorized, validly issued, fully paid, nonassessable and free of
preemptive rights. On the Closing Date, after giving effect to the effectiveness
of the Amended Plan, all equity interests of each Debtor Business Entity that
are held of record or owned beneficially by the Parent, the Company or another
Debtor immediately prior to the Effective Time will be held or owned by the
respective Reorganized Debtors free and clear of any restrictions on transfer
(other than restrictions under the Securities Act and state or foreign
securities laws), claims, Security Interests, options, warrants, rights,
contracts, calls, commitments, equities and demands.

                                       8
<PAGE>

            (e)   There are no voting trusts, proxies or other agreements or
understandings with respect to the voting of any equity interests of any Debtor
Business Entity to which any Debtor is a party or by which it is bound, or, to
the Parent's or the Company's knowledge, any other such trusts, proxies,
agreements or understandings.

            2.5   Financial Statements; Accounts Receivable; Inventory.

            (a)   The Debtors have previously provided to the Buyer (i) the
audited consolidated balance sheets and statements of operations and changes in
stockholders' equity and cash flows of the Company as of December 31, 1996 and
1997 and for the years ended December 31, 1995, 1996 and 1997 (the "Audited
Company Financial Statements") and (ii) the unaudited consolidated balance sheet
(which indicates separately liabilities arising on or after January 30, 1997
(the "Filing Date")) (the "June 30 Unaudited Company Balance Sheet") and the
unaudited consolidated statements of operations and changes in stockholders'
equity and cash flows of the Company as of and for the six-month period ended
June 30, 1998 (the "Company Balance Sheet Date"). Such financial statements
(collectively, the "Company Financial Statements"), (i) comply as to form in all
material respects with applicable accounting requirements and the published
rules and regulations of the U. S. Securities and Exchange Commission (the
"SEC") with respect thereto; (ii) have been prepared in accordance with United
States generally accepted accounting principles ("GAAP") applied on a consistent
basis throughout the periods covered thereby (except as may be indicated therein
or in the notes thereto and, in the case of interim financial statements, as
permitted by Form 10-Q under the Exchange Act); (iii) fairly present the
consolidated financial condition, results of operations and cash flows of the
Company as of the respective dates thereof and for the periods referred to
therein; and (iv) are consistent with the books and records of the Company,
subject, in the case of clauses (i), (ii) and (iii), (a) to the paragraph in the
report of independent auditors on the Audited Company Financial Statements
describing conditions that raise substantial doubt about the Company's ability
to continue as a going concern, and (b) to the Company Financial Statements not
including 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.

            (b)   The accounts receivable of the Debtors reflected on the June
30 Unaudited Company Balance Sheet, and those arising since the date of the June
30 Unaudited Company Balance Sheet, are valid receivables subject to no set-offs
or counterclaims, net of a reserve for bad debts, which reserve is reflected on
the June 30 Unaudited Company Balance Sheet. The inventories of the Debtors
reflected on the June 30 Unaudited Company Balance Sheet are of a quality and
quantity useable and/or saleable in the Ordinary Course of Business, except as
written down to net realizable value on the June 30 Unaudited Company Balance
Sheet. All inventory shown on the June 30 Unaudited Company Balance Sheet has
been priced at the lower of cost or net realizable value.

                                       9
<PAGE>

            2.6   Absence of Certain Changes. Since the Company Balance Sheet
Date, (a) there has not been any Debtor Material Adverse Effect, nor has there
occurred any event or development that would have a Debtor Material Adverse
Effect, and (b) no Debtor has taken any action that would be prohibited by
subsection (a) of Section 4.5 below if taken from and after the date of this
Agreement. Except as set forth in amendments thereto currently being prepared
that decrease the Debtors' liabilities thereunder, the Statement of Affairs and
Schedules of Assets and Liabilities and Executory Contracts of the Debtors filed
with the Bankruptcy Court in the Chapter 11 Proceeding, as amended, includes a
list which is true and complete in all material respects of all the material
creditors, whether secured or unsecured, of the Debtors at the Filing Date.

            2.7   Undisclosed Liabilities. None of the Debtors has any liability
(whether known or unknown, whether absolute or contingent, whether liquidated or
unliquidated, whether due or to become due and whether arising prior to or
subsequent to the Filing Date), except for (a) liabilities that will be fully
discharged in the Chapter 11 Proceeding at the Effective Time, paid from the
Plan Cash and the Plan Shares in accordance with the terms of the Amended Plan
or, with respect to obligations arising under the DIP Loan Agreement, otherwise
paid in full in cash; (b) liabilities arising after the Filing Date separately
shown or expressly reserved for separately on the June 30 Unaudited Company
Balance Sheet; (c) liabilities that have arisen since the Company Balance Sheet
Date in the Ordinary Course of Business of the Debtors and that are similar in
nature and amount to the liabilities that arose during the comparable period of
time in the immediately preceding fiscal period; and (d) liabilities incurred in
the Ordinary Course of Business of the Debtors that are not required by GAAP to
be reflected on the June 30 Unaudited Company Balance Sheet and that are not in
the aggregate material. Section 2.7 of the Company Disclosure Statement sets
forth all amounts due under the Dial Page Indenture at June 30, 1998.

            2.8   Tax Matters.

            (a)   (i) Each of the Debtors has filed all Tax Returns (as defined
below in this Section 2.8(a)) that it was required to file, and all such Tax
Returns were true and complete in all material respects. (ii) No Debtor is or
has ever been a member of a group of corporations with which it has filed (or
been required to file) consolidated, combined or unitary Tax Returns, other than
a group of which only the Debtors are or were members. (iii) The Debtors have
paid all Taxes (as defined below in this Section 2.8(a)) of the Debtors that
were due and payable prior to the date hereof. (iv) All Taxes that any Debtor is
or was required by law to withhold or collect have been duly withheld or
collected and, to the extent required, have been paid to the proper Governmental
Entity. For purposes of this Agreement, "Taxes" means all taxes, charges, fees,
levies or other similar assessments or liabilities, including, without
limitation, income, gross receipts, ad valorem, premium, value-added, excise,
real property, personal property, sales, use, transfer, withholding, employment,
payroll and franchise taxes imposed by the United States of America or any
state, local or foreign government, or any agency thereof, or other political
subdivision of the United States or any such government, and any interest,
fines, penalties, assessments or additions to tax resulting from, attributable
to or incurred in connection with any tax or any contest or dispute thereof. For
purposes

                                       10
<PAGE>

of this Agreement, "Tax Returns" means all reports, returns, declarations,
statements or other information required to be supplied to a taxing authority in
connection with Taxes.

            (b)   (i) The Debtors have delivered or otherwise made available to
the Buyer true and complete copies of all federal income Tax Returns for the
"affiliated group" (as defined in Section 1504(a) of the Code) of which the
Parent is the common parent and the Debtors are members (the "Company Group"),
together with all related examination reports and statements of deficiency, for
all periods commencing on or after December 1, 1993 and, to the extent in the
possession of the Debtors, true and complete copies of the portion of the
federal income Tax Returns of any member of a Debtor Affiliated Group (as
defined below), together with all related examination reports and statements of
deficiency, relating to the activities of any Debtor for all Debtor Affiliated
Periods (as defined below). For purposes of this Section 2.8, "Debtor Affiliated
Group" means each group of corporations with which any Debtor has filed (or was
required to file) consolidated, combined, unitary or similar Tax Returns and
"Debtor Affiliated Period" means a period in which a Debtor was a member of a
Debtor Affiliated Group. (ii) The federal income Tax Returns of the Company
Group have been audited by the Internal Revenue Service or are closed by the
applicable statute of limitations for all taxable years through the taxable year
specified in Section 2.8(b) of the Company Disclosure Schedule. (iii) The
Debtors have made available to the Buyer true and complete copies of all other
Tax Returns of the Debtors in the possession of the Debtors, together with all
related examination reports and statements of deficiency, and, to the extent in
the possession of the Debtors, true and complete copies of the portion of all
other Tax Returns of any member of a Debtor Affiliated Group, together with all
related examination reports and statements of deficiency, relating to the
activities of any Debtor for all Debtor Affiliated Periods. (iv) No examination
or audit of any Tax Return of any Debtor by any Governmental Entity is currently
in progress, threatened or contemplated. (v) No Debtor has been informed by any
jurisdiction that the jurisdiction believes that the Debtor was required to file
any Tax Return that has not since been timely filed or, if not timely filed,
with respect to which an assessed amount has not since been paid. (vi) No Debtor
has waived any statute of limitations with respect to Taxes or agreed to an
extension of time with respect to a Tax assessment or deficiency which waiver or
extension of time is still in effect.

            (c)   No Debtor (i) is a "consenting corporation" within the meaning
of Section 341(f) of the Code and none of the assets of the Debtors is subject
to an election under Section 341(f) of the Code; (ii) has made any payments, is
obligated to make any payments, or is a party to any agreement that could
obligate it to make any payments that may be treated as an "excess parachute
payment" under Section 280G of the Code; (iii) has any actual or potential
liability for any Taxes of any person (other than the Debtors) under Treasury
Regulation Section 1.1502-6 (or any similar provision of federal, state, local,
or foreign law), or as a transferee or successor, by contract, or otherwise; or
(iv) is or has been required to make a basis reduction pursuant to Treasury
Regulation Section 1.1502-20(b) or Treasury Regulation Section 1.337(d)-2(b)
other than a reduction required by reason of the transactions contemplated by
this Agreement, if any.

            (d)   None of the assets of any Debtor: (i) is property that is
required to be treated as being owned by any other person pursuant to the
provisions of former Section 168(f)(8) of the

                                       11
<PAGE>

Code; (ii) is "tax-exempt use property" within the meaning of Section 168(h) of
the Code; or (iii) directly or indirectly secures any debt the interest on which
is tax exempt under Section 103(a) of the Code.

            (e)   No Debtor will have undergone a change in its method of
accounting requiring an inclusion in its taxable income of an adjustment
pursuant to Section 481(c) of the Code for any taxable period beginning on or
after the Closing Date other than a change occurring by reason of the
transactions contemplated by this Agreement, if any.

            (f)   No state or federal "net operating loss" of the Debtors
determined as of the Closing Date is subject to limitation on its use pursuant
to Section 382 of the Code or comparable provisions of state law as a result of
any "ownership change" within the meaning of Section 382(g) of the Code
occurring prior to the Closing Date.

            (g)   Section 2.8(g) of the Company Disclosure Schedule sets forth
in reasonable detail the following information with respect to the Debtors as of
the most recent practicable date: (i) the basis of the Debtors in their assets;
(ii) the basis of the stockholder(s) of the Debtors (other than the Company) in
its stock (or the amount of any "excess loss account"); (iii) the amount of any
net operating loss, net capital loss, unused investment or other credit, unused
foreign tax, or excess charitable contribution allocable to the Debtors; and
(iv) the amount of any deferred gain or loss allocable to the Debtors arising
out of any "deferred intercompany transaction."

            (h)   Neither the Parent nor the Company has been a United States
real property holding corporation within the meaning of Section 897(c)(2) of the
Code during the applicable period specified in Section 897(c)(1)(A)(ii) of the
Code.

            2.9   Tangible Assets. The Debtors own or lease all tangible assets
necessary for the conduct of their respective businesses as presently conducted.
Each such tangible asset is free from material defects, has been maintained in
accordance with normal industry practice, is in good operating condition and
repair (subject to normal wear and tear) and is suitable for the purposes for
which it is presently used, other than where the failures or defects would not
in the aggregate have a Debtor Material Adverse Effect.

            2.10  Owned Real Property. The Company has previously made available
to the Buyer a true and complete listing of all material real property that has
been owned by the Debtors at any time on or after January 30, 1997 (other than
the real property that the Debtors have agreed to sell pursuant to the Purchase
Agreement dated as of July 7, 1998 among the Debtors and Pinnacle Towers Inc.
("Pinnacle") (as approved by order of the Bankruptcy Court entered on August 10,
1998, and as such agreement may be amended in accordance with the terms hereof
and thereof and in accordance with the terms of such order of the Bankruptcy
Court, the "Debtor Tower Agreement"). With respect to each such parcel of real
property which is currently owned by the Debtors, the identified owner has good
record and marketable title to such parcel, free and clear of any Security
Interest, easement, covenant or other restriction, except for Security Interests
in favor of the lenders

                                       12
<PAGE>

under the DIP Loan Agreement, and Security Interests, easements, covenants and
other restrictions which do not materially impair the use, occupancy or value of
such parcel as presently used in the Debtors' businesses.

            2.11  Intellectual Property.

            (a)   The Debtors own, license or otherwise have the legally
      enforceable right to use all patents, trademarks, trade names, service
      marks, copyrights, and any applications for such patents, trademarks,
      trade names, service marks and copyrights, schematics, technology,
      know-how, computer software programs or applications and tangible or
      intangible proprietary information or material used in the operation of
      the businesses of the Debtors or necessary for the operation of the
      businesses of the Debtors as presently conducted by the Debtors
      (collectively, "Debtors' Intellectual Property"). Each such item of
      Debtors' Intellectual Property owned or available for use by the Debtors
      immediately prior to Closing will be owned or available for use by the
      Reorganized Debtors and the Buyer on substantially similar terms and
      conditions immediately following the Closing. No other person or entity
      has any rights to any of the Debtors' Intellectual Property, and no other
      person or entity is infringing, violating or misappropriating any of the
      Debtors' Intellectual Property used in the businesses of the Debtors,
      other than such infringements, violations or misappropriations as would
      not in the aggregate have a Debtor Material Adverse Effect.

            (b)   The business, operations and activities of each Debtor as
      presently conducted or as conducted at any time within the two years prior
      to the date of this Agreement have not materially infringed or violated,
      or constituted a material misappropriation of, and do not now materially
      infringe or violate, or constitute a material misappropriation of, any
      intellectual property rights of any other person or entity. Since January
      30, 1997, no Debtor has received any written, or to its knowledge, verbal,
      complaint, claim or notice alleging any such infringement, violation or
      misappropriation which has not been disposed of through a settlement
      agreement described in Section 2.11(b) of the Company Disclosure Schedule.

            (c)   Section 2.11(c) of the Company Disclosure Schedule sets forth
      each patent or trademark registration which has been issued to or is owned
      by any Debtor with respect to any Debtors' Intellectual Property,
      identifies each pending patent or trademark application or application for
      registration which any Debtor has made or which any Debtor owns with
      respect to any Debtors' Intellectual Property, identifies, with respect to
      each such patent or trademark registration or application: (i) the
      jurisdiction or jurisdictions where such filings have been made; and (ii)
      an estimate of the aggregate application, renewal, continuation or other
      fees payable with respect to such patent or trademark registrations and
      applications within six months of the date of this Agreement, and
      identifies each license or other agreement pursuant to which any Debtor
      has granted (other than in the Ordinary Course of Business) any rights to
      any third party with respect to any Debtors' Intellectual Property. The
      Debtors have delivered or otherwise made available to the Buyer true and
      complete copies of all such licenses and agreements (each as amended to
      date) and have made available to the

                                       13
<PAGE>

      Buyer true and complete copies of all other written documentation
      evidencing ownership of, and any claims or disputes relating to, each such
      item, as well as all patents and trademark registrations and applications.

            (d)   Section 2.11(d) of the Company Disclosure Schedule sets forth
      each item of Debtors' Intellectual Property (other than commercially
      available software generally available to the public at a license fee of
      less than $10,000) used by any Debtor in the operation of its business
      that is owned by a party other than the party using it. The Debtors have
      delivered or otherwise made available to the Buyer true and complete
      copies of all licenses, sublicenses or other agreements (each as amended
      to date) pursuant to which any Debtor uses such Debtors' Intellectual
      Property, all of which are set forth in Section 2.11(d) of the Company
      Disclosure Schedule.

            (e)   The Debtors have previously delivered or otherwise made
      available to the Buyer true and complete copies of all internal reports,
      investigations, analyses or other documents concerning the Debtors' Year
      2000 compliance.

            2.12  Real Property Leases. Section 2.12 of the Company Disclosure
Schedule lists all real property (other than tower sites) leased or subleased to
the Debtors, indicating, in each case, the term of the lease and any extension
and expansion options and the rent payable under such lease. The Debtors have
made available to the Buyer true and complete copies of all such leases and
subleases (each as amended to date), together with true and complete lists of
the tower sites omitted from Section 2.12 of the Company Disclosure Schedule.
With respect to each such lease and sublease:

            (a)   the lease or sublease is legal, valid, binding, enforceable
      and in full force and effect, subject to the effect of the Chapter 11
      Proceeding and bankruptcy, insolvency, moratorium or other similar laws
      affecting the enforcement of creditors' rights generally and except as the
      availability of equitable remedies may be limited by general principles of
      equity;

            (b)   if assumed pursuant to the Amended Plan, the lease or sublease
      will continue to be legal, valid, binding, enforceable and in full force
      and effect immediately following the Closing with the same terms as in
      effect immediately prior to the Closing, subject to the effect of
      bankruptcy, insolvency, moratorium or other similar laws affecting the
      enforcement of creditors' rights generally and except as the availability
      of equitable remedies may be limited by general principles of equity;

            (c)   none of the Debtors, nor, to the Parent's or the Company's
      knowledge, any other party to the lease or sublease, is in material breach
      or default, and no event (other than (i) the nonpayment of rent or other
      charges by the Debtors with respect to periods prior to the Filing Date or
      (ii) the commencement of the Chapter 11 Proceeding) has occurred which,
      with notice or lapse of time, would constitute a material breach or
      default by the Debtors or,

                                       14
<PAGE>

      to the Parent's or the Company's knowledge, by any such other party, or
      permit termination, modification or acceleration thereunder;

            (d)   to the knowledge of the Debtors, there are no material
      disputes, oral agreements or forbearance programs in effect as to the
      lease or sublease;

            (e)   none of the Debtors has assigned, transferred, conveyed,
      mortgaged, deeded in trust or encumbered any interest in the leasehold or
      subleasehold;

            (f)   all facilities leased or subleased thereunder are supplied
      with utilities and other services necessary for the operation of said
      facilities; and

            (g)   other than in the Ordinary Course of Business, no
      construction, alteration or other leasehold improvement work with respect
      to the lease or sublease remains to be paid for or performed by the
      Debtors (except amounts owing for periods prior to the Filing Date).

            2.13  Contracts.

            (a)   Section 2.13 of the Company Disclosure Schedule sets forth a
true and complete list of all written arrangements (including, without
limitation, written agreements) to which any Debtor is a party which, pursuant
to the rules and regulations of the SEC, would have to be attached as exhibits
as material contracts to an Annual Report on Form 10-K filed by the Parent or
the Company if such Annual Report were filed on the date of this Agreement.

            (b)   The Debtors have delivered or otherwise made available to the
Buyer a true and complete copy of each written arrangement (each as amended to
date) required to be listed in Section 2.13 of the Company Disclosure Schedule.
With respect to each written arrangement so listed: (i) as to a prepetition
agreement susceptible of assumption, upon the assumption thereof by the Debtors
pursuant to Section 365 of the Bankruptcy Code as specified in the Amended Plan,
the written arrangement will continue to be legal, valid, binding, enforceable
and in full force and effect immediately following the Closing with the same
terms as in effect immediately prior to the Closing, subject to the effect of
bankruptcy, insolvency, moratorium or other similar laws affecting the
enforcement of creditors' rights generally and except as the availability of
equitable remedies may be limited by general principles of equity; and (ii) none
of the Debtors nor, to the Parent's or the Company's knowledge, any other party,
is in material breach or default, and no event (other than (x) the failure by
the Debtor to pay an amount due thereunder with respect to goods or services
rendered prior to the Filing Date, (y) the failure by the Debtor to render goods
or services thereunto prior to the Filing Date or (z) the commencement of the
Chapter 11 Proceeding) has occurred which with notice or lapse of time would
constitute a material breach or default by the Debtors or, to the Parent's or
the Company's knowledge, by any such other party, or permit termination,
modification or acceleration, under the written arrangement. None of the Debtors
is a party to any oral contract, agreement or other arrangement which, if
reduced to written form, would be required to be listed in

                                       15
<PAGE>

Section 2.13 of the Company Disclosure Schedule under the terms of this Section
2.13. None of the Debtors is restricted by any arrangement from carrying on its
business anywhere in the United States.

            2.14  Licenses and Authorizations.

            (a)   The Debtors hold all licenses, permits, certificates,
franchises, ordinances, registrations, or other rights, applications and
authorizations filed with, granted or issued by, or entered by any Governmental
Entity, including, without limitation, the FCC or any state or local regulatory
authorities or any state or local public service commission or public utility
commission (each, a "State Authority") asserting jurisdiction over any Debtor or
its businesses or assets, that are required for the conduct of their businesses
as currently being conducted (each as amended to date) (collectively, the
"Debtor Authorizations"), other than such licenses, permits, certificates,
franchises, ordinances, registrations or other rights, applications and
authorizations the absence of which would not in the aggregate materially impair
the ability of either the Parent or the Company to consummate the transactions
contemplated hereby or of the Reorganized Debtors to own and operate the
properties, assets and businesses of the Debtors following the Closing. Section
2.14(a) of the Company Disclosure Schedule contains a true and complete list of
such Debtor Authorizations.

            (b)   Section 2.14(b) of the Company Disclosure Schedule contains a
true and complete list of (i) each application of the Debtors pending before the
FCC (collectively, the "Debtor FCC Applications"); (ii) each FCC permit and FCC
license which is not a Debtor Authorization but in which any Debtor, directly or
indirectly, holds an interest, including as a stakeholder in the licensee
(collectively, the "Indirect Debtor Authorizations"); and (iii) all licenses,
certificates, consents, permits, approvals and authorizations for the benefit of
the Debtors pending before any State Authority (collectively, the "Debtor State
Applications"). The Debtor Authorizations, the Debtor FCC Applications, the
Indirect Debtor Authorizations and the Debtor State Applications (collectively,
the "Debtor Licenses and Authorizations") are the only federal, state or local
licenses, certificates, consents, permits, approvals and authorizations that are
required for the conduct of the business and operations of the Debtors as
presently conducted, other than such consents, permits, approvals or
authorizations the absence of which would not in the aggregate materially impair
the ability of either the Parent or the Company to either consummate the
transactions contemplated hereby or of the Reorganized Debtors to own and
operate the properties, assets and businesses of the Debtors following the
Closing.

            (c)   The Debtor Authorizations and, to the Parent's and the
Company's knowledge, the Indirect Debtor Authorizations are in full force and
effect and, other than Security Interests in favor of the lenders under the DIP
Loan Agreement and the Pre-Petition Lenders, have not been pledged or otherwise
encumbered, assigned, suspended, modified in any material adverse respect,
canceled or revoked, and each Debtor has operated in compliance with all terms
thereof or any renewals thereof applicable to it, other than where the failure
to so comply would not in the aggregate have a Debtor Material Adverse Effect or
materially impair the ability of either the Parent or the Company to consummate
the transactions contemplated hereby or of the Reorganized Debtors to own and
operate the properties, assets and businesses of the Debtors following the
Closing. No event

                                       16
<PAGE>

has occurred with respect to any of the Debtor Authorizations which permits, or
after notice or lapse of time or both would permit, revocation or termination
thereof or would result in any other material impairment of the rights of the
holder of any such Debtor Authorizations. To the knowledge of the Parent or the
Company, there is not pending any application, petition, objection or other
pleading with the FCC, any State Authority or any similar body having
jurisdiction or authority over the operations of the Debtors which questions the
validity of or contests any Debtor Authorization or which could reasonably be
expected, if accepted or granted, to result in the revocation, cancellation,
suspension or any materially adverse modification of any Debtor Authorization.

            (d)   Except for approval by the Bankruptcy Court or by the FCC as
contemplated by Section 4.15 or as set forth in Section 2.14(d) of the Company
Disclosure Schedule, no permit, consent, approval, authorization, qualification
or registration of, or declaration to or filing with, any Governmental Entity is
required to be obtained or made by any Debtor in connection with the transfer or
deemed transfer of the Debtor Licenses and Authorizations to the Buyer as a
result of the consummation of the transactions contemplated hereby, except where
the failure to obtain or make such permit, consent, approval, authorization,
qualification, registration, declaration or filing would not materially impair
the ability of the Company to consummate the transactions contemplated hereby or
the Reorganized Debtors to own and operate the properties, assets and businesses
of the Debtors following the Closing.

            2.15  Litigation. Except as to claims arising prior to the Filing
Date that are within the jurisdiction of the Bankruptcy Court or are to be
resolved in the Chapter 11 Proceeding or by force of the discharge granted to
the Debtors in connection with the Chapter 11 proceeding, as of the date of this
Agreement: (a) there is no action, suit, proceeding or investigation to which
any Debtor is a party (either as a plaintiff or defendant) pending or, to the
Parent's or the Company's knowledge, threatened before any court, Governmental
Entity or arbitrator, and, to the Parent's or the Company's knowledge, there is
no basis for any such action, suit, proceeding or investigation; (b) none of the
Debtors nor, to the Parent's or the Company's knowledge, any officer, director
or employee of any Debtor has been permanently or temporarily enjoined by any
order, judgment or decree of any court or Governmental Entity from engaging in
or continuing to conduct the business of the Debtors; and (c) no order, judgment
or decree of any court or Governmental Entity has been issued in any proceeding
to which any Debtor is or was a party or, to the Parent's or the Company's
knowledge, in any other proceeding, that enjoins or requires any Debtor to take
action of any kind with respect to its businesses, assets or properties. Except
for the regulatory matters addressed in Section 2.14, none of the actions,
suits, proceedings or investigations listed in Section 2.15 of the Company
Disclosure Schedule, individually or collectively, if determined adversely to
the interests of the Debtors, would have a Debtor Material Adverse Effect.

                                       17
<PAGE>

            2.16  Employees.

            (a)   Section 2.16(a) of the Company Disclosure Schedule sets forth
a true and complete list as of the most recent practicable date of all
employment contracts or agreements relating to employment to which any of the
Debtors is a party which are not terminable by the Debtors without penalty upon
less than 30 or fewer days' notice.

            (b)   There are no collective bargaining agreements to which any of
the Debtors is a party. No Debtor has experienced any strikes, grievances,
claims of unfair labor practices or other collective bargaining disputes and, to
the Parent's or the Company's knowledge, no organizational effort is presently
being made or threatened by or on behalf of any labor union with respect to its
employees. To the knowledge of the Parent or the Company, there is no reasonable
basis to believe that any Debtor will be subject to any labor strike or other
organized work force disturbance following the Closing.

            2.17  Employee Benefits.

            (a)   Section 2.17(a) of the Company Disclosure Schedule contains a
true and complete list of all Employee Benefit Plans (as defined below in this
Section 2.17(a)) maintained, or contributed to, by any Debtor or any ERISA
Affiliate (as defined below in this Section 2.17(a)) of any Debtor ("Company
Employee Benefit Plans"). For purposes of this Agreement, "Employee Benefit
Plan" means any "employee pension benefit plan" (as defined in Section 3(2) of
the Employee Retirement Income Security Act of 1974, as amended ("ERISA")), any
"employee welfare benefit plan" (as defined in Section 3(l) of ERISA), and any
other material written or oral plan, agreement or arrangement involving direct
or indirect employee compensation, including, without limitation, insurance
coverage, severance benefits, disability benefits, pension, retirement plans,
profit sharing, deferred compensation, bonuses, stock options, stock purchase,
phantom stock, stock appreciation or other forms of incentive compensation or
post-retirement compensation. For purposes of this Agreement, "ERISA Affiliate"
means any member of (i) a controlled group of corporations (as defined in
Section 414(b) of the Code); (ii) a group of trades or businesses under common
control (as defined in Section 414(c) of the Code); or (iii) an affiliated
service group (as defined under Section 414(m) of the Code or the regulations
under Section 414(o) of the Code). True and complete copies of (i) all Company
Employee Benefit Plans that have been reduced to writing; (ii) written summaries
of all unwritten Company Employee Benefit Plans; (iii) all trust agreements,
insurance contracts and summary plan descriptions related to the Company
Employee Benefit Plans; (iv) the annual report filed on IRS Form 5500, 5500C or
5500R, if applicable, for the most recent plan year for each Company Employee
Benefit Plan; and (v) the most recent qualification letter issued by the
Internal Revenue Service with respect to each Company Employee Benefit Plan that
is intended to qualify under Section 401(a) of the Code, have been made
available to the Buyer. Each Company Employee Benefit Plan has been administered
in accordance with its terms in all material respects, and each Debtor and, to
the Parent's or the Company's knowledge, each ERISA Affiliate of any Debtor has
in all material respects met its obligations (if any) with respect to each
Company Employee Benefit Plan and has made all required contributions (if any)
thereto. The Debtors and all

                                       18
<PAGE>

Company Employee Benefit Plans are in compliance in all material respects with
the currently applicable provisions (if any) of ERISA, the Code and other
applicable federal, state and foreign laws and the regulations thereunder. Each
Company Employee Benefit Plan that is intended to qualify under Section 401(a)
of the Code is so qualified. Each Company Employee Benefit Plan that is required
to satisfy Section 401(k)(3) or Section 401(m)(2) of the Code has been reviewed
for compliance with, and has satisfied the requirements of, said Sections for
each plan year ending prior to the Closing.

            (b)   To the Parent's or the Company's knowledge, as of the date of
this Agreement, there are no inquiries or investigations by any Governmental
Entity, termination proceedings or other claims (except claims for benefits
payable in the normal operation of the Company Employee Benefit Plans and
proceedings with respect to qualified domestic relations orders), suits or
proceedings against or involving any Company Employee Benefit Plan or asserting
any rights or claims to benefits under any Company Employee Benefit Plan.

            (c)   Neither any Debtor nor, to the Parent's or the Company's
knowledge, any ERISA Affiliate of any Debtor has ever maintained a Company
Employee Benefit Plan subject to Section 412 of the Code, Part 3 of Subtitle B
of Title I of ERISA, or Title IV of ERISA. At no time has any Debtor or, to the
Parent's or the Company's knowledge, any ERISA Affiliate of any Debtor been
obligated to contribute to any "multiemployer plan" (as defined in Section
4001(a)(3) of ERISA) that is subject to Title IV of ERISA. No act or omission
has occurred and no condition exists with respect to any Company Employee
Benefit Plan that would subject any Debtor or, to the Company's knowledge, any
ERISA Affiliate of any Debtor to any material fine, penalty, Tax or liability of
any kind imposed under ERISA or the Code. No prohibited transaction (as defined
in Section 406 of ERISA or Section 4975 of the Code) has occurred with respect
to any Company Employee Benefit Plan that is subject to ERISA or the Code. No
Company Employee Benefit Plan, plan documentation or agreement, summary plan
description or other written communication distributed generally to employees by
its terms prohibits any Debtor from amending or terminating any such Company
Employee Benefit Plan and any Company Employee Benefit Plan may be terminated
without liability to any Debtor or the Buyer, except for benefits accrued
through the date of termination. Except as may be required by Part 6 of Title I
of ERISA or similar state laws regarding continuation of benefits, no former
employees participate in any employee welfare benefit plans listed in Section
2.17(a) of the Company Disclosure Schedule beyond the month of the termination
of his employment. No Company Employee Benefit Plan includes in its assets any
securities issued by the Debtors. No Company Employee Benefit Plan has been
subject to tax under Section 511 of the Code.

            (d)   Section 2.17(d) of the Company Disclosure Schedule lists each:
(i) agreement with any director, executive officer or other key employee of the
Debtors (A) the benefits of which are contingent, or the terms of which are
altered, upon the occurrence of a transaction involving the Debtors of the
nature of any of the transactions contemplated by this Agreement, (B) providing
any term of employment or compensation guarantee, or (C) providing severance
benefits or other benefits upon the consummation of any transaction or after the
termination of employment of such director, executive officer or key employee;
(ii) agreement, plan or arrangement under which any person may

                                       19
<PAGE>

receive a payment from any Debtor that may be subject to the tax imposed by
Section 4999 of the Code or may constitute a "parachute payment" under Section
280G of the Code; and (iii) agreement or plan binding any Debtor, including,
without limitation, any stock option plan, stock appreciation right plan,
restricted stock plan, stock purchase plan, severance benefit plan, or any
Company Employee Benefit Plan, any of the benefits of which will be increased,
or the vesting of the benefits of which will be accelerated, by the occurrence
of any of the transactions contemplated by this Agreement or the value of any of
the benefits of which will be calculated on the basis of any of the transactions
contemplated by this Agreement.

            2.18  Environmental Matters.

            Except for Sections 2.5(a), 2.23 and 2.24, this Section 2.18
contains the exclusive representations and warranties of the Parent and the
Company concerning environmental matters, including but not limited to
Environmental Laws and Materials of Environmental Concern (as both of those
terms are defined below in this Section 2.18). Each of the Parent and the
Company represents and warrants as follows:

            (a)   Each of the Debtors is in compliance with all applicable
Environmental Laws (as defined below in this Section 2.18(a)), other than where
the failure to be in compliance would not in the aggregate have a Debtor
Material Adverse Effect. There is no pending or, to the Parent's or the
Company's knowledge, threatened civil or criminal litigation, written notice of
violation, formal administrative proceeding, or written notice of investigation
or inquiry or written information request by any Governmental Entity, relating
to any Environmental Law involving any Debtors or their respective assets and
properties. For purposes of this Agreement, "Environmental Law" means any
foreign, federal, state or local law, statute, permits, orders, rule or
regulation or the common or decisional law relating to the environment or
occupational health and safety, including, without limitation, any statute,
regulation or order pertaining to (i) treatment, storage, disposal, generation
and transportation of industrial, toxic or hazardous substances or solid or
hazardous waste; (ii) air, water and noise pollution; (iii) groundwater and soil
contamination; (iv) the release or threatened release into the environment of
industrial, toxic or hazardous substances, or solid or hazardous waste,
including, without limitation, emissions, discharges, injections, spills,
escapes or dumping of pollutants, contaminants or chemicals; (v) the protection
of wildlife, marine sanctuaries and wetlands, including, without limitation, all
endangered and threatened species; (vi) storage tanks, vessels and containers;
(vii) underground and other storage tanks or vessels, abandoned, disposed or
discarded barrels, containers and other closed receptacles; (viii) health and
safety of employees and other persons; and (ix) manufacture, processing, use,
distribution, treatment, storage, disposal, transportation or handling of
pollutants, contaminants, chemicals or industrial, toxic or hazardous substances
or oil or petroleum products or solid or hazardous waste. For the purposes of
this Agreement, the terms "release" and "environment" shall have the meaning set
forth in the United States Comprehensive Environmental Compensation, Liability
and Response Act of 1980 ("CERCLA").

                                       20
<PAGE>

            (b)   There have been no releases of any Materials of Environmental
Concern (as defined below in this Section 2.18(b)) into the environment at any
parcel of real property or any facility formerly or currently owned, operated or
controlled by any Debtor for which any Debtor may be liable under any
Environmental Law of the jurisdiction in which such property or facility is
located, other than such releases as would not in the aggregate have a Debtor
Material Adverse Effect. With respect to any such releases of Materials of
Environmental Concern, the Debtor has given all required notices (if any) to
Governmental Entities (copies of which have been provided to the Buyer). There
have been no releases of Materials of Environmental Concern at parcels of real
property or facilities other than those owned, operated or controlled by the
Debtors that could reasonably be expected to have an impact on the real property
or facilities owned, operated or controlled by the Debtors, other than such
impacts as would not in the aggregate have a Debtor Material Adverse Effect. For
purposes of this Agreement, "Materials of Environmental Concern" means any
chemicals, pollutants or contaminants, hazardous substances (as such term is
defined under CERCLA or any Environmental Law), solid wastes and hazardous
wastes (as such terms are defined under the United States Resources Conservation
and Recovery Act or any Environmental Law), toxic materials, oil or petroleum
and petroleum products, or any other material subject to regulation under any
Environmental Law, except for normal office and cleaning products.

            (c)   Set forth in Section 2.18 of the Company Disclosure Schedule
is a list of all environmental reports, investigations and audits which to the
knowledge of the Parent or the Company (whether conducted by or on behalf of the
Debtors or a third party, and whether done at the initiative of the Debtors or
directed by a Governmental Entity or other third party) were issued during the
past five years relating to premises formerly or currently owned, operated or
controlled by the Debtors. True and complete copies of any such report, or the
results of any such investigation or audit, which to the knowledge of the Parent
or the Company are in the possession of the Parent or the Company (or can be
obtained by the Company through reasonable efforts), have been delivered or
otherwise made available to the Buyer.

            (d)   Neither the Parent nor the Company has any knowledge of any
material environmental liability of the solid and hazardous waste transporters
and treatment, storage and disposal facilities that have been utilized by
Debtors.

            (e)   The Debtors hold all Environmental Authorizations (as defined
below in this Section 2.18(e)) that are legally required for the conduct of
their businesses as currently conducted, other than where the failure to hold
such Environmental Authorizations would not in the aggregate have a Debtor
Material Adverse Effect, and such Environmental Authorizations (if any) are
listed in Section 2.18 of the Company Disclosure Schedule. For purposes of this
Agreement, the term "Environmental Authorization" means any license, permit,
certificate, or other authorization from a Governmental Entity under any
applicable Environmental Law. Each of the Debtors is and has been in compliance
with all such Environmental Authorizations, other than such noncompliance as
would not in the aggregate have a Debtor Material Adverse Effect.

                                       21
<PAGE>

            (f)   None of the transactions contemplated by this Agreement or the
Amended Plan will require the Company or the Debtors to comply with an
Environmental Property Transfer Act (as defined below in this Section 2.18(f)).
For purposes of this Agreement, the term "Environmental Property Transfer Act"
means any applicable law (including rules, regulations and administrative orders
thereunder) of any federal, state, local or foreign government that requires any
notification or disclosure of environmental conditions in connection with the
transfer, sale, lease or closure of any property.

            2.19  Legal Compliance. Each Debtor and the conduct and operation of
its respective business is and has been in compliance with each law (including
rules, regulations and administrative orders thereunder) of any federal, state,
local or foreign government, or any Governmental Entity, that (a) affects or
relates to this Agreement or the transactions contemplated hereby or (b) is
applicable to the Debtors or their respective businesses, other than where the
failure to be or to have been in compliance would not in the aggregate have a
Debtor Material Adverse Effect or materially impair the ability of the Parent or
the Company to consummate the transactions contemplated hereby or the
Reorganized Debtors to own and operate the properties, assets and businesses of
the Debtors following the Closing.

            2.20  Subscriber Cancellations; Suppliers. The Debtors have
previously delivered or otherwise made available to the Buyer true and complete
reports of the number of paging units the Debtors had in service on a quarterly
basis for its most recent fiscal year and the interim period covered by the
Company Financial Statements, and the number of subscriber cancellations the
Debtors had for each such period. To the knowledge of the Parent or the Company,
no material supplier of any Debtors has indicated within the past year that it
will stop, or decrease the rate of, supplying materials, products or services to
them.

            2.21  Capital Expenditures. The Debtors have previously delivered to
the Buyer a true and complete list of all capital expenditures in an amount in
excess of $300,000 incurred by the Debtors during 1997, which list is attached
as Section 4.5(a) of the Company Disclosure Schedule.

            2.22  Brokers' Fees. None of the Debtors has any liability or
obligation to pay any fees or commissions to any broker, finder or agent with
respect to the transactions contemplated by this Agreement.

            2.23  Certain Information. None of the information supplied by the
Debtors for inclusion or incorporation by reference in (i) the Proxy Statement
and Registration Statement (each as defined in Section 4.13) or (ii) any
document to be filed with the SEC, the FCC or any other Governmental Entity in
connection with the transactions contemplated hereby will, at the respective
times filed with the SEC, the FCC or other Governmental Entity and, in addition,
(A) in the case of the Proxy Statement, at the time it or any amendment or
supplement thereto is mailed to the Buyer's stockholders and at the time of the
Meeting (as defined in Section 4.12) and at the Closing and, (B) in the case of
the Registration Statement, at the time it becomes effective under the
Securities Act, contain any untrue statement of the Debtors of a material fact
or omit to state a material fact required

                                       22
<PAGE>

to be stated therein or necessary to make the statements therein, in light of
the circumstances under which they were made, not misleading. Notwithstanding
the foregoing, no representation is made by the Debtors with respect to
statements made in any of the foregoing documents based upon information
supplied by the Buyer.

            2.24  Disclosure. No representation or warranty by the Debtors
contained in this Agreement, and no statement contained in the Company
Disclosure Schedule or any other document, certificate or other instrument
delivered to or to be delivered by or on behalf of the Debtors pursuant to this
Agreement, contains or will as of the Closing Date contain any untrue statement
of a material fact or omits or will as of the Closing Date omit to state any
material fact necessary, in light of the circumstances under which it was or
will be made, in order to make the statements herein or therein not misleading.


                                   ARTICLE III

                   REPRESENTATIONS AND WARRANTIES OF THE BUYER

            The Buyer represents and warrants to the Parent and the Company that
the statements contained in this Article III are true and complete, except as
set forth in the disclosure schedule of the Buyer delivered to the Company
simultaneously with the execution and delivery hereof (the "Buyer Disclosure
Schedule"). The Buyer Disclosure Schedule shall be arranged in sections and
paragraphs corresponding to the numbered and lettered sections and paragraphs
contained in this Article III, and the disclosures in any section or paragraph
of the Buyer Disclosure Schedule shall qualify other sections or paragraphs in
this Article III only to the extent that it is reasonably clear from a reading
of the disclosure that such disclosure is applicable to such other sections or
paragraphs. For purposes of this Agreement, a "Buyer Material Adverse Effect"
shall mean a material adverse effect on the businesses, assets (including
licenses, franchises and other intangible assets), financial condition,
operating income and prospects of the Buyer and its subsidiaries, taken as a
whole, excluding any effect generally applicable to the economy or the industry
in which the Buyer conducts its business.

            3.1   Organization Qualification, Corporate Power and Authority.

            (a)   Each of the Buyer and the Merger Subsidiary is a corporation
duly organized, validly existing and in good standing under the laws of the
State of Delaware. Each of the Buyer and the Merger Subsidiary is duly qualified
to conduct business and is in good standing under the laws of each jurisdiction
(each such jurisdiction being set forth in Section 3.1(a) of the Buyer
Disclosure Schedule) in which the nature of its businesses or the ownership or
leasing of its properties requires such qualification, other than where the
failure to be so qualified would not in the aggregate have a Buyer Material
Adverse Effect. Each of the Buyer and the Merger Subsidiary has all requisite
corporate power and authority to carry on the businesses in which it is engaged
and to own and use the properties owned and used by it. The Buyer has furnished
to the Company true and complete

                                       23
<PAGE>

copies of the Buyer's and the Merger Subsidiary's respective certificates of
incorporation and by-laws, each as amended and as in effect on the date hereof.
Each of the Buyer and the Merger Subsidiary has at all times complied with, and
is not in default under or in violation of, any provision of its certificate of
incorporation or by-laws, other than where the failure to so comply and such
defaults and violations would not in the aggregate have a Buyer Material Adverse
Effect.

            (b)   Each of the Buyer and the Merger Subsidiary has all requisite
power and authority to execute and deliver this Agreement. The execution and
delivery of this Agreement by the Buyer and the Merger Subsidiary and, subject
to the approval of the Buyer Charter Amendment (as defined in Section 4.12) and
the Buyer Share Issuance (as defined below in this Section 3.1(b)) by the
stockholders of the Buyer, the performance of this Agreement and the
consummation of the transactions contemplated hereby by the Buyer and the Merger
Subsidiary have been duly and validly authorized by all necessary corporate
action on the part of the Buyer and the Merger Subsidiary. This Agreement has
been duly and validly executed and delivered by the Buyer and the Merger
Subsidiary and constitutes a valid and binding obligation of the Buyer and the
Merger Subsidiary, enforceable against the Buyer and the Merger Subsidiary in
accordance with its terms. For purposes of this Agreement, "Buyer Share
Issuance" means the issuance by the Buyer of shares of its capital stock as
contemplated by this Agreement and the Amended Plan, including (i) the issuance
of the Plan Shares as contemplated by the Merger Agreement and the Amended Plan,
(ii) the issuance of shares of Buyer Common Stock and, if applicable, shares of
Class B Common Stock, par value $0.01 per share, of the Buyer ("Buyer Class B
Common Stock") having the terms specified in the Buyer Charter Amendment upon
exercise of Rights issued pursuant to the Rights Offering or issued to the
Standby Purchasers (or their assignees or persons in substitution therefor)
pursuant to the Standby Purchase Commitments in connection with the Rights
Offering, and (iii) the issuance of the Buyer Warrants issued by the Buyer (x)
pursuant to the Rights Offering, (y) to the Standby Purchasers in connection
with the Rights Offering , and (z) pursuant to the Buyer Distribution, and the
issuance of shares of Buyer Common Stock upon exercise of any of the foregoing
Buyer Warrants.

            3.2   Capitalization.

            (a)   The authorized capital stock of the Buyer consists of
75,000,000 shares of Buyer Common Stock and 10,000,000 shares of preferred
stock, $.01 par value ("Buyer Preferred Stock"), of which 100,000 shares have
been designated as Series B Junior Participating Preferred Stock and 250,000
shares have been designated as Series C Convertible Preferred Stock. As of the
date hereof, (i) 21,067,110 shares of Buyer Common Stock are issued and
outstanding, (ii) no shares of Buyer Common Stock are held in the treasury of
the Buyer, (iii) 2,740,381 shares of Buyer Common Stock are issuable upon
exercise of certain outstanding options or are reserved for issuance pursuant to
the Buyer's existing stock option and purchase plans, and (iv) 5,343,305 shares
of Buyer Common Stock are reserved for issuance upon exercise of other
convertible securities of the Buyer. As of the date hereof, no shares of Series
B Junior Participating Preferred Stock and 250,000 shares of Series C
Convertible Preferred Stock are issued and outstanding, and no shares of Buyer
Preferred Stock are held in the treasury of the Buyer. Except for such options
and such other convertible securities and except for the rights to purchase
shares of Series B Junior Participating Preferred Stock

                                       24
<PAGE>

of the Buyer (the "Preferred Rights") issued pursuant to the Rights Agreement
dated as of October 13, 1995 (the "Rights Agreement"), between the Buyer and The
Bank of New York, as Rights Agent, there are no options, warrants, rights,
calls, convertible instruments, agreements or commitments to which the Buyer or
any Buyer Subsidiary is a party or which are binding upon any of them (other
than this Agreement) providing for the issuance, disposition or acquisition of
any of its capital stock or stock appreciation, phantom stock or similar rights.
All the issued and outstanding shares of the Buyer's capital stock are duly
authorized, validly issued, fully paid, nonassessable and free of all preemptive
rights.

            (b)   All the outstanding shares of capital stock of each of the
Buyer Subsidiaries are beneficially owned by the Buyer, directly or indirectly,
free and clear of any restrictions on transfer (other than restrictions under
the Securities Act and state or foreign securities laws), claims, Security
Interests, options, warrants, rights, contracts, calls, commitments, equities or
demands, and all such shares are duly authorized, validly issued, fully paid,
nonassessable and free of preemptive rights.

            (c)   There are no voting trusts, proxies or other agreements or
understandings to which the Buyer or any of the Buyer Subsidiaries is a party
with respect to the voting of the capital stock of the Buyer or any Buyer
Subsidiary. None of the Buyer or the Buyer Subsidiaries is required to redeem,
repurchase or otherwise acquire shares of capital stock or debt securities of
the Buyer or of any Buyer Subsidiary as a result of the transactions
contemplated by this Agreement.

            (d)   The authorized capital stock of the Merger Subsidiary consists
of 1,000 shares of common stock, $.01 par value, all of which are issued and
outstanding and held beneficially and of record by the Buyer.

            (e)   The shares of Buyer Common Stock to be issued and distributed
as contemplated by Section 1.3(e) and Section 1.6 of this Agreement and the
shares of Buyer Common Stock, the shares of Buyer Class B Common Stock, if
applicable, and the Buyer Warrants to be issued and delivered pursuant to the
Rights Offering (as defined in Section 4.20(a)) or as contemplated by the
Standby Purchase Commitments, in each case when so issued and distributed or
delivered, as the case may be, and the shares of Buyer Common Stock issued upon
conversion of such shares of Buyer Class B Common Stock, if applicable, when so
converted in accordance with the Buyer Charter Amendment (as defined in Section
4.12), and the shares of Buyer Common Stock issued upon exercise of Buyer
Warrants, when issued, paid for and delivered as provided in the Buyer Warrant
Agreement, will be duly authorized, validly issued, fully paid, nonassessable
and free of preemptive rights.

            3.3   Noncontravention. Except for the applicable requirements of
the Securities Act and the Exchange Act, any applicable state and foreign
securities laws, the HSR Act, the Communications Act and the regulations of the
FCC, and state public utility, telecommunication or public service laws, neither
the execution and delivery of this Agreement by each of the Buyer and the Merger
Subsidiary nor the consummation of the transactions contemplated hereby will (a)
conflict with or violate any provision of the Buyer's or Merger Subsidiary's
respective certificate of

                                       25
<PAGE>

incorporation or by-laws, (b) require on the part of the Buyer and/or the Merger
Subsidiary any filing with, or any permit, authorization, consent or approval
of, any Governmental Entity, other than where the failure to make or obtain such
filings, permits, authorizations, consents or approvals would not in the
aggregate have a Buyer Material Adverse Effect or materially adversely affect
the ability of the Buyer to operate the business of the Buyer following the
Effective Time, (c) conflict with, result in a breach of, constitute (with or
without due notice or lapse of time or both) a default under, result in the
acceleration of, create in any party any right to accelerate, terminate, modify
or cancel, or require any notice, consent or waiver under, any contract, lease,
sublease, license, sublicense, franchise, permit, indenture, agreement or
mortgage for borrowed money, instrument of indebtedness, Security Interest or
other arrangement to which the Buyer or any Buyer Subsidiary is a party or by
which the Buyer or any Buyer Subsidiary is bound or to which any of their
respective assets are subject or any judgment, order, writ, injunction, decree,
statute, rule or regulation applicable to the Buyer or any Buyer Subsidiary or
any of their respective properties or assets, other than such conflicts,
violations, breaches, defaults, accelerations, terminations, modifications,
cancellations or notices, consents or waivers as would not in the aggregate have
a Buyer Material Adverse Effect, or (d) result in the imposition of any Security
Interest upon any assets of the Buyer or any Buyer Subsidiary.

            3.4   Business Entities.

            (a)   Section 3.4(a) of the Buyer Disclosure Schedule sets forth a
true and complete list of each corporation, partnership, limited liability
company or other form of business association in which the Buyer, directly or
indirectly, owns any equity interest or any security convertible into or
exchangeable for an equity interest (each a "Buyer Business Entity") which is
material to the Buyer.

            (b)   The Buyer Business Entities listed in Section 3.4(b) of the
Buyer Disclosure Schedule are the only Buyer Business Entities which have
conducted any operations, trade or businesses of the Buyer since January 30,
1997, hold any Buyer Authorizations (as defined in Section 3.14(a)) or own any
assets necessary for the conduct of the businesses of the Buyer as currently
conducted.

            (c)   The Buyer owns all the outstanding equity interests in each
Buyer Business Entity. For purposes of this Agreement, "Buyer Subsidiary" means
any Buyer Business Entity in which the Buyer, directly or indirectly, owns a
majority of the equity interests.

            (d)   No Buyer Business Entity is in default under or in violation
of any provision of its organizational documents. To the knowledge of the Buyer,
all the issued and outstanding equity interests of each Buyer Business Entity
are duly authorized, validly issued, fully paid, nonassessable and free of
preemptive rights. All equity interests of each Buyer Business Entity are held
of record or owned beneficially by the Buyer free and clear of any restrictions
on transfer (other than restrictions under the Securities Act and state or
foreign securities laws), claims, Security Interests, options, warrants, rights,
contracts, calls, commitments, equities and demands.

                                       26
<PAGE>

            (e)   There are no voting trusts, proxies or other agreements or
understandings with respect to the voting of any equity interests of any Buyer
Business Entity to which the Buyer or any Buyer Subsidiary is a party or by
which it is bound, or, to the Buyer's knowledge, any other such trusts, proxies,
agreements or understandings.

            3.5   Reports and Financial Statements.

            (a)   The Buyer has previously furnished to the Debtors true and
complete copies, each as amended or supplemented to date, of (i) the Buyer's
Annual Report on Form 10-K for the fiscal year ended December 31, 1997, as filed
by the Buyer with the SEC, and (ii) all other reports, statements, exhibits and
other documents filed by the Buyer with the SEC under Section 13 or 15 of the
Exchange Act (which are all the reports, statements, exhibits and other
documents required to be so filed) since December 31, 1997 (such materials,
together with any amendments or supplements thereto, collectively being referred
to herein as the "Buyer Reports"). As of their respective dates, the Buyer
Reports complied in all material respects with the requirements of the Exchange
Act and the rules and regulations of the SEC promulgated thereunder applicable
to such Buyer Reports and the Buyer Reports did not contain any untrue statement
of a material fact or omit to state a material fact required to be stated
therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading. The audited financial
statements and unaudited interim financial statements of the Buyer included in
the Buyer Reports (i) comply as to form in all material respects with applicable
accounting requirements and the published rules and regulations of the SEC with
respect thereto, (ii) have been prepared in accordance with GAAP applied on a
consistent basis throughout the periods covered thereby (except as may be
indicated therein or in the notes thereto, and, in the case of interim financial
statements, as permitted by Form 10-Q under the Exchange Act), (iii) fairly
present the consolidated financial condition, results of operations and cash
flows of the Buyer as of the respective dates thereof and for the periods
referred to therein, and (iv) are consistent with the books and records of the
Buyer.

            (b)   The accounts receivable of the Buyer and its subsidiaries
reflected on the consolidated balance sheet of the Buyer as of June 30, 1998
(the "Buyer Balance Sheet Date"), filed by the Buyer as part of its Quarterly
Report on Form 10-Q for the quarter that ended on such date (the "Most Recent
Buyer Balance Sheet"), and those arising since the date of the Most Recent Buyer
Balance Sheet, are valid receivables subject to no set-offs or counterclaims,
net of a reserve for bad debts, which reserve is reflected on the Most Recent
Buyer Balance Sheet. The inventories of the Buyer and its subsidiaries reflected
on the Most Recent Buyer Balance Sheet are of a quality and quantity useable
and/or saleable in the Ordinary Course of Business, except as written down to
net realizable value on the Most Recent Buyer Balance Sheet. All inventory shown
on the Most Recent Buyer Balance Sheet has been priced at the lower of cost or
net realizable value.

                                       27
<PAGE>

            3.6   Absence of Certain Changes. Since the Buyer Balance Sheet
Date, (a) there has not been any Buyer Material Adverse Effect, nor has there
occurred any event or development that would have a Buyer Material Adverse
Effect and (b) the Buyer has not taken any action that would be prohibited by
subsection (b) of Section 4.5 below if taken from and after the date of this
Agreement.

            3.7   Undisclosed Liabilities. Neither the Buyer nor any Buyer
Subsidiary has any liability (whether known or unknown, whether absolute or
contingent, whether liquidated or unliquidated, whether due or to become due),
except for (a) liabilities separately shown or expressly reserved on the Most
Recent Buyer Balance Sheet, (b) liabilities that have arisen since the Buyer
Balance Sheet Date in the Ordinary Course of Business of the Buyer or any
Subsidiary and that are similar in nature and amount to the liabilities that
arose during the comparable period of time in the immediately preceding fiscal
period; and (c) liabilities incurred in the Ordinary Course of Business of the
Buyer that are not required by GAAP to be reflected on the Most Recent Buyer
Balance Sheet and that are not in the aggregate material.

            3.8   Tax Matters.

            (a)   Each of the Buyer and the Buyer Subsidiaries has filed all Tax
Returns that it was required to file, and all such Tax Returns were true and
complete in all material respects. Neither the Buyer nor any Buyer Subsidiary is
or has even been a member of a group of corporations which has filed (or been
required to file) consolidated, combined or unitary Tax Returns, other than a
group of which the Buyer and the Buyer Subsidiaries are or were members. Except
as described in Section 3.8(a) of the Buyer Disclosure Schedule, (i) each group
of corporations with which the Buyer has filed (or was required to file)
consolidated, combined, unitary or similar Tax Returns (a "Buyer Affiliated
Group") has filed all Tax Returns that it was required to file with respect to
any period in which the Buyer was a member of such Buyer Affiliated Group (a
"Buyer Affiliated Period") and (ii) all such Tax Returns were true and complete
in all material respects. Each of the Buyer and the Buyer Subsidiaries has paid
on a timely basis all Taxes (as defined below) that were due and payable and, to
the Buyer's knowledge, each member of a Buyer Affiliated Group has paid all
Taxes that were due and payable with respect to all Buyer Affiliated Periods.
The unpaid Taxes of the Buyer for tax periods through the Most Recent Buyer
Balance Sheet do not exceed the accruals and reserves (other than accruals and
reserves established to reflect timing differences between book and tax income)
for Taxes reflected on the Most Recent Buyer Balance Sheet. All Taxes that the
Buyer or any Buyer Subsidiary is or was required by law to withhold or collect
have been duly withheld or collected and, to the extent required, have been paid
to the proper Governmental Entity.

            (b)   The Buyer has delivered or otherwise made available to the
Company true and complete copies of all federal income Tax Returns of the Buyer
and the Buyer Subsidiaries, together with all related examination reports and
statements of deficiencies, for all periods commencing after December 31, 1993
and, to the extent in the possession of the Buyer, true and complete copies of
the portion of the federal income Tax Returns of any member of a Buyer
Affiliated Group, together with all related examination reports and statements
of deficiency, relating to the activities of the Buyer or

                                       28
<PAGE>

any Buyer Subsidiary for all Buyer Affiliated Periods commencing after December
31, 1993. The federal income Tax Returns of each of the Buyer, any Buyer
Subsidiary and, each member of a Buyer Affiliated Group have been audited by the
Internal Revenue Service or are closed by the applicable statute of limitations
for all taxable years through the taxable year specified in Section 3.8(b) of
the Buyer Disclosure Schedule. The Buyer has delivered or otherwise made
available to the Company true and complete copies of all other Tax Returns of
the Buyer and each Buyer Subsidiary, together with all related examination
reports and statements of deficiency, for all periods commencing after December
31, 1993 and, to the extent in the possession of the Buyer, true and complete
copies of the portion of all other Tax Returns, of any member of a Buyer
Affiliated Group, together with all related examination reports and statements
of deficiency, relating to the activities of the Buyer or any Buyer Subsidiary
for all Affiliated Periods commencing after December 31, 1993. No examination or
audit of any Tax Return of the Buyer, any Buyer Subsidiary or, to the Buyer's
knowledge, any member of a Buyer Affiliated Group with respect to an Affiliated
Period by any Governmental Entity is currently in progress or, to the knowledge
of the Buyer, threatened or contemplated. Neither the Buyer, any Buyer
Subsidiary nor, to the Buyer's knowledge, any member of a Buyer Affiliated Group
has been informed by any jurisdiction that the jurisdiction believes that the
Buyer or any Buyer Subsidiary or any member of a Buyer Affiliated Group was
required to file any Tax Return that was not filed on a timely basis. Neither
the Buyer, any Buyer Subsidiary nor, to the Buyer's Knowledge, any member of a
Buyer Affiliated Group has waived any statute of limitations with respect to
Taxes or agreed to an extension of time with respect to a Tax assessment or
deficiency.

            (c)   Neither the Buyer nor any Buyer Subsidiary (i) is a
"consenting corporation" within the meaning of Section 341(f) of the Code and
none of the assets of the Buyer or any Buyer Subsidiary is subject to an
election under Section 341(f) of the Code; (ii) has been a United States real
property holding corporation within the meaning of Section 897(c)(2) of the Code
during the applicable period specified in Section 897(c)(1)(A)(ii) of the Code;
(iii) has made any payments, is obligated to make any payments, or is a party to
any agreement that could obligate it to make any payments that may be treated as
an "excess parachute payment" under Section 280G of the Code; (iv) has any
actual or potential liability for any Taxes of any person (other than the Buyer
or any Buyer Subsidiary) under Treasury Regulation Section 1.1502-6 (or any
similar provision of federal, state, local, or foreign law), or as a transferee
or successor, by contract, or otherwise; or (v) is or has been required to make
a basis reduction pursuant to Treasury Regulation Section 1.1502-20(b) or
Treasury Regulation Section 1.337(d)-2(b).

            (d)   None of the assets of the Buyer or any Buyer Subsidiary: (i)
is property that is required to be treated as being owned by any other person
pursuant to the provisions of former Section 168(f)(8) of the Code; (ii) is
"tax-exempt use property" within the meaning of Section 168(h) of the Code; or
(iii) directly or indirectly secures any debt the interest on which is tax
exempt under Section 103(a) of the Code.

                                       29
<PAGE>

            (e)   Neither the Buyer nor any Buyer Subsidiary has undergone a
change in its method of accounting resulting in an adjustment to its taxable
income pursuant to Section 481(h) of the Code.

            (f)   No state or federal "net operating loss" of the Buyer or any
Buyer Subsidiary determined as of the Closing Date is subject to limitation on
its use pursuant to Section 382 of the Code or comparable provisions of state
law as a result of any "ownership change" within the meaning of Section 382(g)
of the Code occurring prior to the Closing Date.

            (g)   Section 3.8(g) of the Buyer Disclosure Schedule sets forth in
reasonable detail the following information with respect to the Buyer and each
Buyer Subsidiary as of the most recent practicable date: (i) the basis of the
Buyer and each Buyer Subsidiary in their respective assets; (ii) the basis of
the stockholder(s) in its stock (or the amount of any "excess loss account");
(iii) the amount of any net operating loss, net capital loss, unused investment
or other credit, unused foreign tax, or excess charitable contribution
allocable; and (iv) the amount of any deferred gain or loss allocable arising
out of any "deferred intercompany transaction."

            3.9   Tangible Assets. The Buyer and the Buyer Subsidiaries own or
lease all tangible assets necessary for the conduct of their respective
businesses as presently conducted. Each such tangible asset is free from
material defects, has been maintained in accordance with normal industry
practice, is in good operating condition and repair (subject to normal wear and
tear) and is suitable for the purposes for which it is presently used, other
than where the failures or defects would not in the aggregate have a Buyer
Material Adverse Effect.

            3.10  Owned Real Property. The Buyer has previously made available
to the Company a true and complete listing of all material real property that
has been owned by the Buyer or any Buyer Subsidiary at any time on or after
January 30, 1997. With respect to each parcel of real property which is
currently owned by the Buyer or any Buyer Subsidiary, the identified owner has
good record and marketable title to such parcel, free and clear of any Security
Interest, easement, covenant or other restriction, except for Security
Interests, easements, covenants and other restrictions which do not materially
impair the use, occupancy or value of such parcel as presently used in the
Buyer's or Buyer Subsidiaries' businesses.

            3.11  Intellectual Property.

            (a)   The Buyer owns, licenses or otherwise has the legally
enforceable right to use all patents, trademarks, trade names, service marks,
copyrights, and any applications for such patents, trademarks, trade names,
service marks and copyrights, schematics, technology, know-how, computer
software programs or applications and tangible or intangible proprietary
information or material used in the operation of the business of the Buyer or
any Buyer Subsidiary or necessary for the operation of the business of the Buyer
or any Buyer Subsidiary as presently conducted by the Buyer or any Buyer
Subsidiary (collectively "Buyer Intellectual Property"). Each such item of Buyer
Intellectual Property owned or available for use by the Buyer or a Buyer
Subsidiary immediately prior

                                       30
<PAGE>

to Closing will be owned or available for use by the Buyer or the Buyer
Subsidiary on substantially similar terms and conditions immediately following
the Closing. No other person or entity has any rights to any of the Buyer
Intellectual Property, and no other person or entity is infringing, violating or
misappropriating any of, the Buyer Intellectual Property used in the business of
the Buyer, other than such infringements, violations or misappropriations as
would not in the aggregate have a Buyer Material Adverse Effect.

            (b)   The business, operations and activities of the Buyer and each
Buyer Subsidiary as presently conducted or as conducted at any time within the
two years prior to the date of this Agreement have not materially infringed or
violated, or constituted a material misappropriation of, and do not now
materially infringe or violate, or constitute a material misappropriation of,
any intellectual property rights of any other person or entity. Since January
30, 1997, neither the Buyer nor any Buyer Subsidiary has received any written,
or to its knowledge, verbal, complaint, claim or notice alleging any such
infringement, violation or misappropriation which has not been disposed of
through a settlement agreement described in Section 3.11(b) of the Buyer
Disclosure Schedule.

            3.12  Real Property Leases. Section 3.12 of the Buyer Disclosure
Schedule lists all real property (other than tower sites) leased or subleased to
the Buyer or any Buyer Subsidiary, indicating, in each case, the term of the
lease and the rent payable under such lease. The Buyer has made available to the
Company true and complete copies of all such leases and subleases (each as
amended to date). With respect to each such lease and sublease:

            (a)   the lease or sublease is legal, valid, binding, enforceable
      and in full force and effect, subject to the effect of bankruptcy,
      insolvency, moratorium or other similar laws affecting the enforcement of
      creditors' rights generally and except as the availability of equitable
      remedies may be limited by general principles of equity;

            (b)   neither the Buyer nor any Buyer Subsidiary nor, to the Buyer's
      knowledge, any other party to the lease or sublease, is in material breach
      or default, and no event has occurred which, with notice or lapse of time,
      would constitute a material breach or default by the Buyer or any Buyer
      Subsidiary or, to the Buyer's knowledge, by any such other party, or
      permit termination, modification or acceleration thereunder;

            (c)   to the knowledge of the Buyer, there are no material disputes,
      oral agreements or forbearance programs in effect as to the lease or
      sublease;

            (d)   neither the Buyer nor any Buyer Subsidiary has assigned,
      transferred, conveyed, mortgaged, deeded in trust or encumbered any
      interest in the leasehold or subleasehold;

                                       31
<PAGE>

            (e)   all facilities leased or subleased thereunder are supplied
      with utilities and other services necessary for the operation of said
      facilities; and

            (f)   other than in the Ordinary Course of Business, no
      construction, alteration or other leasehold improvement work with respect
      to the lease or sublease remains to be paid for or performed by the Buyer
      or any Buyer Subsidiary.

            3.13  Contracts. The Buyer has delivered or otherwise made available
to the Company a true and complete copy of each written arrangement (each as
amended to date) filed as an exhibit to any Buyer Report. With respect to each
written arrangement (i) each written agreement will continue to be legal, valid,
binding, enforceable and in full force and effect immediately following the
Closing with the same terms as in effect immediately prior to the Closing,
subject to the effect of bankruptcy, insolvency, moratorium or other similar
laws affecting the enforcement of creditors' rights generally and except as the
availability of equitable remedies may be limited by general principles of
equity; and (ii) neither the Buyer nor any Buyer Subsidiary nor, to the Buyer's
knowledge, any other party, is in material breach or default, and no event has
occurred which with notice or lapse of time would constitute a material breach
or default by the Buyer or any Buyer Subsidiary or, to the Buyer's knowledge, by
any such other party, or permit termination, modification or acceleration, under
the written arrangement. Neither the Buyer nor any Buyer Subsidiary is a party
to any oral contract, agreement or other arrangement which, if reduced to
written form, would be required to be filed as an exhibit as a material contract
to an Annual Report on Form 10-K filed by the Buyer. Neither the Buyer nor any
Buyer Subsidiary is restricted by any arrangement from carrying on its business
anywhere in the United States.

            3.14  Licenses and Authorizations

            (a)   The Buyer and the Buyer Subsidiaries hold all licenses,
permits, certificates, franchises, ordinances, registrations, or other rights,
applications and authorizations filed with, granted or issued by, or entered by
any Governmental Entity, including, without limitation, the FCC or any State
Authority asserting jurisdiction over the Buyer or any Buyer Subsidiary or its
business or assets, that are required for the conduct of their businesses as
currently being conducted (each as amended to date) (the "Buyer
Authorizations"), other than such licenses, permits, certificates, franchises,
ordinances, registrations or other rights, applications and authorizations the
absence of which would not in the aggregate materially impair the ability of the
Buyer to consummate the transactions contemplated hereby or of the Buyer to own
and operate the properties, assets and businesses of the Buyer following the
Closing. The Buyer has heretofore delivered to the Company a true and complete
list of such Buyer Authorizations.

            (b)   The Buyer has previously made available to the Company a true
and complete list of (i) each application of the Buyer and/or any Buyer
Subsidiary pending before the FCC (collectively, the "Buyer FCC Applications");
(ii) each FCC permit and FCC license which is not a Buyer Authorization but in
which the Buyer or any Buyer Subsidiary, directly or indirectly, holds an
interest, including as a stakeholder in the licensee (collectively, the
"Indirect Buyer Authorizations");

                                       32
<PAGE>

and (iii) all licenses, certificates, consents, permits, approvals and
authorizations for the benefit of the Buyer and the Buyer Subsidiaries, as
applicable, pending before any State Authority (collectively, the "Buyer State
Applications"). The Buyer Authorizations, the Buyer FCC Applications, the
Indirect Buyer Authorizations and the Buyer State Applications (collectively,
the "Buyer Licenses and Authorizations") are the only federal, state or local
licenses, certificates, consents, permits, approvals and authorizations that are
required for the conduct of the business and operations of the Buyer and the
Buyer Subsidiaries as presently conducted, other than such consents, permits,
approvals or authorizations the absence of which would not in the aggregate
materially impair the ability of the Buyer and the Merger Subsidiary to either
consummate the transactions contemplated hereby or of the Buyer and the Buyer
Subsidiaries to own and operate the properties, assets and businesses of the
Buyer and the Buyer Subsidiaries following the Closing.

            (c)   The Buyer Authorizations and, to the Buyer's knowledge, the
Indirect Buyer Authorizations are in full force and effect and have not been
pledged or otherwise encumbered, assigned, suspended, modified in any material
adverse respect, canceled or revoked, and the Buyer and the Buyer Subsidiaries
have each operated in compliance with all terms thereof or any renewals thereof
applicable to them, other than where the failure to so comply would not in the
aggregate have a Buyer Material Adverse Effect or materially impair the ability
of the Buyer to consummate the transactions contemplated hereby or of the Buyer
to own and operate the properties, assets and businesses of the Buyer following
the Closing. No event has occurred with respect to any of the Buyer
Authorizations which permits, or after notice or lapse of time or both would
permit, revocation or termination thereof or would result in any other material
impairment of the rights of the holder of any such Buyer Authorizations. To the
knowledge of the Buyer, there is not pending any application, petition,
objection or other pleading with the FCC, any State Authority or any similar
body having jurisdiction or authority over the operations of the Buyer and the
Buyer Subsidiaries which questions the validity of or contests any Buyer
Authorization or which could reasonably be expected, if accepted or granted, to
result in the revocation, cancellation, suspension or any materially adverse
modification of any Buyer Authorization.

            (d)   Except for approval by the Bankruptcy Court or by the FCC as
contemplated by Section 4.15, or as set forth in Section 3.14(d) of the Buyer
Disclosure Schedule, no permit, consent, approval, authorization, qualification
or registration of, or declaration to or filing with, any Governmental Entity is
required to be obtained or made by the Buyer or any Buyer Subsidiary in
connection with the transfer or deemed transfer of the Buyer Licenses and
Authorizations as a result of the consummation of the transactions contemplated
hereby, except where the failure to obtain or make such permit, consent,
approval, authorization, qualification, registration, declaration or filing
would not materially impair the ability of the Buyer to consummate the
transactions contemplated hereby or the Buyer to own and operate the properties,
assets and businesses of the Buyer following the Closing.

                                       33
<PAGE>

            3.15  Litigation. Except as described in the Buyer Reports, as of
the date of this Agreement: (a) there is no action, suit, proceeding or
investigation to which the Buyer or any Buyer Subsidiary is a party (either as a
plaintiff or defendant) pending or, to the Buyer's knowledge, threatened before
any court, Governmental Entity or arbitrator, and, to the Buyer's knowledge,
there is no basis for any such action, suit, proceeding or investigation; (b)
neither the Buyer nor any Buyer Subsidiary nor, to the Buyer's knowledge, any
officer, director or employee of the Buyer or any Buyer Subsidiary has been
permanently or temporarily enjoined by any order, judgment or decree of any
court or Governmental Entity from engaging in or continuing to conduct the
business of the Buyer or any Buyer Subsidiary; and (c) no order, judgment or
decree of any court or Governmental Entity has been issued in any proceeding to
which the Buyer or any Buyer Subsidiary is or was a party or, to the Buyer's
knowledge, in any other proceeding, that enjoins or requires the Buyer or any
Buyer Subsidiary to take action of any kind with respect to its business, assets
or properties. None of the actions, suits, proceedings or investigations listed
in Section 3.15 of the Buyer Disclosure Schedule, individually or collectively,
if determined adversely to the interests of the Buyer or any Buyer Subsidiary,
would have a Buyer Material Adverse Effect.

            3.16  Employees.

            (a)   There are no collective bargaining agreements to which Buyer
or any Buyer Subsidiary is a party. Neither the Buyer nor any Buyer Subsidiary
has experienced any strikes, grievances, claims of unfair labor practices or
other collective bargaining disputes and, to the Buyer's knowledge, no
organizational effort is presently being made or threatened by or on behalf of
any labor union with respect to its employees. To the knowledge of the Buyer or
any Buyer Subsidiary there is no reasonable basis to believe that the Buyer or
any Buyer Subsidiary will be subject to any labor strike or other organized work
force disturbance following the Closing.

            3.17  Employee Benefits.

            (a)   Section 3.17(a) of the Buyer Disclosure Schedule contains a
true and complete list of all Employee Benefit Plans maintained, or contributed
to, by the Buyer or any Buyer Subsidiary or any ERISA Affiliate of the Buyer or
any Buyer Subsidiary (the "Buyer Employee Benefit Plan"). True and complete
copies of (i) all Buyer Employee Benefit Plans that have been reduced to
writing; (ii) written summaries of all unwritten Buyer Employee Benefit Plans;
(iii) all trust agreements, insurance contracts and summary plan descriptions
related to the Buyer Employee Benefit Plans; (iv) the annual report filed on IRS
Form 5500, 5500C or 5500R, if applicable, for the most recent plan year for each
Buyer Employee Benefit Plan; and (v) the most recent qualification letter issued
by the Internal Revenue Service with respect to each Buyer Employee Benefit Plan
that is intended to qualify under Section 401(a) of the Code, have been made
available to the Company. Each Buyer Employee Benefit Plan has been administered
in accordance with its terms in all material respects, and the Buyer and each
Buyer Subsidiary and, to the Buyer's knowledge, each ERISA Affiliate of the
Buyer or any Buyer Subsidiary has in all material respects met its obligations
(if any) with respect to each Buyer Employee Benefit Plan and has made all
required contributions (if any) thereto. The Buyer, all Buyer Subsidiaries and
all Buyer Employee Benefit Plans are in compliance in all material respects with
the

                                       34
<PAGE>

currently applicable provisions (if any) of ERISA, the Code and other applicable
federal, state and foreign laws and the regulations thereunder. Each Buyer
Employee Benefit Plan that is intended to qualify under Section 401(a) of the
Code is so qualified. Each Buyer Employee Benefit Plan that is required to
satisfy Section 401(k)(3) or Section 401(m)(2) of the Code has been reviewed for
compliance with, and has satisfied the requirements of, said Sections for each
plan year ending prior to the Closing.

            (b)   To the Buyer's knowledge, as of the date of this Agreement,
there are no inquiries or investigations by any Governmental Entity, termination
proceedings or other claims (except claims for benefits payable in the normal
operation of the Buyer Employee Benefit Plans and proceedings with respect to
qualified domestic relations orders), suits or proceedings against or involving
any Buyer Employee Benefit Plan or asserting any rights or claims to benefits
under any Buyer Employee Benefit Plan.

            (c)   Neither the Buyer or any Buyer Subsidiary nor, to the Buyer's
knowledge, any ERISA Affiliate of the Buyer or any Buyer Subsidiary has ever
maintained an Buyer Employee Benefit Plan subject to Section 412 of the Code,
Part 3 of Subtitle B of Title I of ERISA, or Title IV of ERISA. At no time has
the Buyer or any Buyer Subsidiary or, to the Buyer's knowledge, any ERISA
Affiliate of the Buyer or any Buyer Subsidiary been obligated to contribute to
any "multiemployer plan" (as defined in Section 4001(a)(3) of ERISA) that is
subject to Title IV of ERISA. No act or omission has occurred and no condition
exists with respect to any Buyer Employee Benefit Plan that would subject the
Buyer, any Buyer Subsidiary or, to the Buyer's knowledge, any ERISA Affiliate of
the Buyer or any Buyer Subsidiary to any material fine, penalty, Tax or
liability of any kind imposed under ERISA or the Code. No prohibited transaction
(as defined in Section 406 of ERISA or Section 4975 of the Code) has occurred
with respect to any Buyer Employee Benefit Plan that is subject to ERISA or the
Code. No Buyer Employee Benefit Plan, plan documentation or agreement, summary
plan description or other written communication distributed generally to
employees by its terms prohibits the Buyer from amending or terminating any such
Buyer Employee Benefit Plan and any Buyer Employee Benefit Plan may be
terminated without liability to the Buyer or any Buyer Subsidiary, except for
benefits accrued through the date of termination. Except as may be required by
Part 6 of Title I of ERISA or similar state laws regarding continuation of
benefits, no former employees participate in any employee welfare benefit plans
listed in Section 3.17(a) of the Buyer Disclosure Schedule beyond the month of
the termination of his employment. No Buyer Employee Benefit Plan includes in
its assets any securities issued by the Buyer. No Employee Benefit Plan has been
subject to tax under Section 511 of the Code.

            (d)   Section 3.17(d) of the Buyer Disclosure Schedule lists each:
(i) agreement with any director, executive officer or other key employee of the
Buyer or any Buyer Subsidiary (A) the benefits of which are contingent, or the
terms of which are altered, upon the occurrence of a transaction involving the
Buyer or any Buyer Subsidiary of the nature of any of the transactions
contemplated by this Agreement; (B) providing any term of employment or
compensation guarantee or (C) providing severance benefits or other benefits
upon the consummation of any transaction or after the termination of employment
of such director, executive officer or key employee; (ii)

                                       35
<PAGE>

agreement, plan or arrangement under which any person may receive payments from
the Buyer or any Buyer Subsidiary that may be subject to the tax imposed by
Section 4999 of the Code or may constitute a "parachute payment" under Section
280G of the Code; and (iii) agreement or plan binding the Buyer or any Buyer
Subsidiary, including, without limitation, any stock option plan, stock
appreciation right plan, restricted stock plan, stock purchase plan, severance
benefit plan, or any Employee Benefit Plan, any of the benefits of which will be
increased, or the vesting of the benefits of which will be accelerated, by the
occurrence of any of the transactions contemplated by this Agreement or the
value of any of the benefits of which will be calculated on the basis of any of
the transactions contemplated by this Agreement.

            3.18  Environmental Matters.

            Except for Sections 3.5(a), 3.26, and 3.27, this Section 3.18
contains the exclusive representations and warranties of the Buyer concerning
environmental matters, including but not limited to Environmental Laws and
Materials of Environmental Concern. The Buyer represents and warrants as
follows:

            (a)   Each of the Buyer and each Buyer Subsidiary is in compliance
with all applicable Environmental Laws, other than where the failure to be in
compliance would not in the aggregate have a Buyer Material Adverse Effect.
There is no pending or, to the knowledge of the Buyer or any Buyer Subsidiary,
threatened civil or criminal litigation, written notice of violation, formal
administrative proceeding, or written notice of investigation or inquiry or
written information request by any Governmental Entity, relating to any
Environmental Law involving the Buyer or any Buyer Subsidiary or their
respective assets and properties.

            (b)   There have been no releases of any Materials of Environmental
Concern into the environment at any parcel of real property or any facility
formerly or currently owned, operated or controlled by the Buyer or any Buyer
Subsidiary for which the Buyer or any Buyer Subsidiary may be liable under any
Environmental Law of the jurisdiction in which such property or facility is
located, other than such releases as would not in the aggregate have a Buyer
Material Adverse Effect. With respect to any such releases of Materials of
Environmental Concern, the Buyer or such Buyer Subsidiary has given all required
notices (if any) to Governmental Entities (copies of which have been provided to
the Company). There have been no releases of Materials of Environmental Concern
at parcels of real property or facilities other than those owned, operated or
controlled by the Buyer or any Buyer Subsidiary that could reasonably be
expected to have an impact on the real property or facilities owned, operated or
controlled by the Buyer or any Buyer Subsidiary other than such impacts as would
not in the aggregate have a Debtor Material Adverse Effect.

            (c)   Set forth in Section 3.18 of the Buyer Disclosure Schedule is
a list of all environmental reports, investigations and audits which to the
knowledge of the Buyer (whether conducted by or on behalf of the Buyer or any
Buyer Subsidiary or a third party, and whether done at the initiative of the
Buyer or any Buyer Subsidiary or directed by a Governmental Entity or other
third party) were issued during the past five years relating to premises
formerly or currently owned,

                                       36
<PAGE>

operated or controlled by the Buyer or any Buyer Subsidiary. True and complete
copies of any such report, or the results of any such investigation or audit,
which to the knowledge of the Buyer are in the possession of Buyer or any Buyer
Subsidiary (or can be obtained by Buyer or any Buyer Subsidiary through
reasonable efforts), have been delivered or otherwise made available to the
Company.

            (d)   Neither the Buyer nor any Buyer Subsidiary has any knowledge
of any material environmental liability of the solid and hazardous waste
transporters and treatment, storage and disposal facilities that have been
utilized by the Buyer or any Buyer Subsidiary.

            (e)   The Buyer and the Buyer Subsidiaries hold all Environmental
Authorizations that are legally required for the conduct of their businesses as
currently conducted, other than where the failure to hold such Environmental
Authorizations would not in the aggregate have a Buyer Material Adverse Effect,
and such Environmental Authorizations (if any) are listed in Section 3.18 of the
Buyer Disclosure Schedule. The Buyer and each of the Buyer Subsidiaries is and
has been in compliance with all such Environmental Authorizations, other than
such noncompliance as would not in the aggregate have a Buyer Material Adverse
Effect.

            (f)   None of the transactions contemplated by this Agreement or the
Amended Plan will require the Buyer or any Buyer Subsidiary to comply with an
Environmental Property Transfer Act.

            3.19  Legal Compliance. Each of the Buyer and each Buyer Subsidiary
and the conduct and operation of its respective business, is and has been in
compliance with each law (including rules, regulations and administrative orders
thereunder) of any federal, state, local or foreign government, or any
Governmental Entity, that (a) affects or relates to this Agreement or the
transactions contemplated hereby or (b) is applicable to the Buyer or any Buyer
Subsidiary or their respective businesses, other than where the failure to be or
to have been in compliance would not in the aggregate have a Buyer Material
Adverse Effect or materially impair the ability of the Buyer to consummate the
transactions contemplated hereby or the Buyer to own and operate the properties,
assets and businesses of the Buyer following the Closing.

            3.20  Merger Subsidiary. The Merger Subsidiary was formed solely for
the purpose of effecting the transactions contemplated by this Agreement and,
except for such obligations or liabilities incurred in connection with its
incorporation or organization, and except for this Agreement and any other
agreements or arrangements contemplated by this Agreement, the Merger Subsidiary
has not and will not have incurred, directly or indirectly, any obligations or
liabilities or engaged in any business activities of any type or kind whatsoever
or entered into any agreements or arrangements with any person.

                                       37
<PAGE>

            3.21  Capital Expenditures; Suppliers. The Buyer has previously
delivered to the Company a true and complete accounting of all capital
expenditures incurred by it or the Buyer Subsidiaries during 1997 and their
projected capital expenditure budget for calendar years 1998 and 1999. To the
knowledge of the Buyer or any Buyer Subsidiary no material supplier of the Buyer
or any Buyer Subsidiary has indicated within the past year that it will stop, or
decrease the rate of, supplying materials, products or services to them.

            3.22  Brokers' Fees. Neither the Buyer nor any Buyer Subsidiary has
any liability or obligation to pay any fees or commissions to any broker, finder
or agent with respect to the transactions contemplated by this Agreement except
to Bear, Stearns & Co. Inc. ("Bear Stearns"), the financial advisor to the
Buyer.

            3.23  Rights Agreement; Section 203. (a) The Buyer has executed the
amendment to its Rights Agreement dated as of October 13, 1995 in the form
attached hereto as Exhibit D, and such amendment is in full force and effect.

            (b)   The Board of Directors of the Buyer has approved the Merger,
this Agreement and the Amended Plan together with the transactions contemplated
thereby (including without limitation the acquisition by the Standby Purchasers
of Buyer Warrants, Buyer Common Stock or Buyer Class B Common Stock, if
applicable, pursuant to this Agreement, the Amended Plan and the Standby
Purchase Commitments, or of Buyer Common Stock or Buyer Class B Common Stock, if
applicable, pursuant to the Buyer Warrants), including for purposes of Section
203 of the DGCL.

            3.24  Opinion of Financial Advisor. The Buyer has received an
opinion of Bear Stearns & Co. Inc., a copy of which is attached hereto as
Exhibit E.

            3.25  Required Vote of the Buyer's Stockholders. The affirmative
vote of a majority of the votes cast by holders of Buyer Stock is required to
approve the Buyer Share Issuance and the affirmative vote of a majority of the
votes entitled to be cast by holders of Buyer Stock is required to approve the
Buyer Charter Amendment. No other vote of the security holders of the Buyer or
of any Buyer Subsidiary is required by law, the respective organization
documents thereof or otherwise in order for the Buyer to consummate the Merger
and the other transactions contemplated hereby and by the Amended Plan.

            3.26  Certain Information. None of the information supplied by the
Buyer or any Buyer Subsidiary for inclusion or incorporation by reference in (i)
the Proxy Statement (as defined in Section 4.13(a)) and Registration Statement
(as defined in Section 4.20(c)) or (ii) any document to be filed with the SEC,
the FCC or any other Governmental Entity in connection with the transactions
contemplated hereby will, at the respective times filed with the SEC, the FCC or
other Governmental Entity and, in addition, (A) in the case of the Proxy
Statement, at the time it or any amendment or supplement thereto is mailed to
the Buyer's stockholders and at the time of the Meeting (as defined in Section
4.12) and at the Closing and, (B) in the case of the Registration Statement, at
the time it becomes effective under the Securities Act, contain any untrue
statement of

                                       38
<PAGE>

the Buyer or any Buyer Subsidiary of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading.
Notwithstanding the foregoing, no representation is made by the Buyer or any
Buyer Subsidiary with respect to statements made in any of the foregoing
documents based upon information supplied by the Company.

            3.27  Disclosure. No representation or warranty by the Buyer
contained in this Agreement, and no statement contained in the Buyer Disclosure
Schedule or any other document, certificate or other instrument delivered to or
to be delivered by or on behalf of the Buyer pursuant to this Agreement,
contains or will as of the Closing Date contain any untrue statement of a
material fact or omits or will as of the Closing Date omit to state any material
fact necessary, in light of the circumstances under which it was or will be
made, in order to make the statements herein or therein not misleading.


                                   ARTICLE IV

                                    COVENANTS

            4.1   Best Efforts. Except, in the case of the Parent and the
Company, to the extent required by Bankruptcy-Related Requirements (as defined
in Section 4.5), each Party shall use its best efforts to cause the transactions
contemplated by this Agreement and the Amended Plan to be consummated in
accordance with the terms hereof and thereof, and without limiting the
generality of the foregoing shall use its best efforts to obtain all necessary
approvals, waivers, consents, permits, licenses, registrations and other
authorizations required in connection with this Agreement and the Amended Plan
and the transactions contemplated hereby and thereby and, in the case of the
Buyer, to assist the Parent and the Company in the preparation of a Disclosure
Statement related to the Amended Plan and, in the case of the Parent and the
Company, to assist the Buyer in the preparation of the Proxy Statement and
Registration Statement, including, without limitation, entry of the Confirmation
Order, and to make all filings with and to give all notices to third parties
which may be necessary or reasonably required of it in order to consummate the
transactions contemplated hereby and thereby, provided, however, that actions
taken by the Parent and the Company in compliance with Section 4.7(b) and
actions taken by the Buyer in accordance with Section 4.7(e) shall not be deemed
a breach by the Parent or the Company, on the one hand, or the Buyer, on the
other hand, of this Section 4.1.

            4.2   Approvals; Consents. Each Party shall obtain and maintain in
full force and effect all approvals, consents, permits, licenses and other
authorizations from all Governmental Entities reasonably necessary or required
for the operation of their respective businesses as presently conducted, as and
when such approvals, consents, permits, licenses or other authorizations are
necessary or required, except where the failure to do so would not have a Debtor
Material Adverse Effect or a Buyer Material Adverse Effect, as applicable, or
materially impair the ability of the

                                       39
<PAGE>

Company or the Buyer to consummate the transactions contemplated hereby or the
Reorganized Debtors or the Buyer to own and operate the properties, assets and
businesses of the Debtors following the Closing. Without limiting the generality
of the foregoing, each Party shall maintain its respective authorizations in
full force and effect, shall not take any action which could reasonably be
expected to have a material adverse effect on such authorizations or any
licenses and authorizations, shall diligently pursue all applications and shall,
prior to the expiration date of any material authorization, timely file for the
renewal of any such authorization. Neither Party shall make any material
commitments to any Governmental Entity relating to any material approval,
consent, permit, license or other authorization without the prior written
consent of the other Parties. The Parties shall consult with one another as to
the approach to be taken with any Governmental Entity with respect to obtaining
any necessary consent to the transactions contemplated hereby and by the Amended
Plan, and each of the Parties shall keep the other Parties reasonably informed
as to the status of any such communications with any Governmental Entity.
Without limiting the generality of the foregoing, the Buyer, the Parent and the
Company shall, and shall cause each of the Buyer Subsidiaries or each of the
other Debtors, as applicable, to make the necessary preliminary filings under
the HSR Act no later than ten days following the date of this Agreement and
shall seek early termination of all applicable waiting periods. The Buyer, the
Parent and the Company shall, and shall cause each of the Buyer Subsidiaries or
each of the other Debtors, as applicable, to use their reasonable best efforts
to resolve any competitive issues relating to or arising under the HSR Act or
any other federal or state antitrust or fair trade law raised by any
Governmental Entity. The Parties will consult and cooperate with one another,
and consider in good faith the views of one another, in connection with any
analyses, appearances, presentations, memoranda, briefs, arguments, opinions and
proposals made or submitted by or on behalf of any Party in connection with
proceedings under or relating to the HSR Act or any other federal or state
antitrust or fair trade law. In the event of a challenge to the transactions
contemplated by this Agreement pursuant to the HSR Act, the Buyer, the Parent
and the Company shall, and shall cause each of the Buyer Subsidiaries or each of
the other Debtors, as applicable, to use their reasonable best efforts to defeat
such challenge, including by institution and defense of litigation, or to settle
such challenge on terms that permit the consummation of the transactions
contemplated by this Agreement; provided, however, that nothing herein shall
require the Buyer to divest or hold separate any portion of its business or
otherwise take any action, which divestiture or holding separate or taking such
action would be materially adverse to the continued conduct of the Buyer's or
the Debtor's businesses. The Buyer shall pay all filing fees payable by any
Party in connection with the HSR Act.

            4.3   Buyer Not To Control. Notwithstanding any provision of this
Agreement that may be construed to the contrary, pending the consummation of the
transactions contemplated hereby, the Buyer shall not obtain actual (de facto)
or legal (de jure) control over the Debtors. Specifically, and without
limitation, the responsibility for the operation of the Debtors shall, pending
the consummation of the transactions contemplated hereby, reside with the Boards
of Directors of the Debtors (subject to the jurisdiction of the Bankruptcy
Court), including, but not limited to, responsibility for the following matters:
access to and the use of the facilities of and equipment owned by the Debtors;
control of the daily operation of the Debtors; creation and implementation of
policy decisions; employment and supervision of employees; payment of financing
obligations and expenses

                                       40
<PAGE>

incurred in the operation of the Debtors; receipt and distribution of monies and
profits derived from the operation of the Debtors; and execution and approval of
all contracts and applications prepared and filed before regulatory agencies.
Notwithstanding the foregoing, the Parties shall consult and cooperate with one
another, and consider in good faith the views of one another with respect to the
assumption or rejection by the Debtors prior to Closing of any unexpired lease,
license or other executory contract.

            4.4   Bankruptcy Covenants.

            (a)   Promptly after the execution of this Agreement, the Parent and
the Company shall, and shall cause each of the other Debtors to, file a motion
(the "Initial Merger Motion") for expedited determination of approval of the
Exclusivity Provisions (as defined in Section 4.7(a)), the Company Breakup Fee
and the Buyer Breakup Fee (as defined in Section 4.8(a)) and the Buyer
Reimbursement (as defined in Section 4.21) provided for in this Agreement in
form and substance acceptable to the Buyer. The Parent and the Company shall,
and shall cause each of the other Debtors to, use its best efforts to obtain an
order approving the Initial Merger Motion (the "Initial Merger Order") within 15
days after the date of this Agreement, which order shall be in form and
substance acceptable to the Buyer, the Parent and the Company with only such
changes as shall be agreed to by all the Parties in writing.

            (b)   As soon as practicable following the execution of this
Agreement (and in no event later than August 20, 1998), the Parent and the
Company shall, and shall cause each of the other Debtors to, file with the
Bankruptcy Court the Amended Plan. As soon as practicable following the filing
of the Amended Plan (and in no event later than August 24, 1998), the Parent and
the Company shall, and shall cause each of the Debtors to, file with the
Bankruptcy Court a Disclosure Statement related thereto in form and substance
reasonably acceptable to the Buyer and the Company (the "Disclosure Statement").
Thereafter, without the prior written consent of the Buyer, the Parent and the
Company shall not, and shall cause each of the other Debtors not to, amend or
modify any material provision of the Amended Plan or the Disclosure Statement
or, except as provided in Section 4.7(b), withdraw the Amended Plan or file any
other plan of reorganization of the Debtors.

            (c)   The Parent and the Company shall, and shall cause each of the
other Debtors to, promptly provide the Buyer with drafts of all documents,
motions, orders, filings or pleadings that the Parent, the Company or any other
Debtor proposes to file with the Bankruptcy Court which relate to the
consummation or approval of the Amended Plan, this Agreement or any provision
therein or herein, and will provide the Buyer with reasonable opportunity to
review such filings to the extent reasonably practicable. The Parent and the
Company shall, and shall cause each of the other Debtors to, consult and
cooperate with the Buyer, and consider in good faith the views of the Buyer, as
contemplated by the Amended Plan, with respect to all such filings and the
acceptance or rejection prior to Closing of any unexpired lease, license or
other executory contract. The Parent and the Company shall, and shall cause each
of the other Debtors to, promptly (and, in any event, within 48 hours after
receipt of such pleadings by the Debtors) provide the Buyer with copies of all
pleadings (other than proofs of claim below $10,000 in amount) received by or
served by or upon any of the

                                       41
<PAGE>

Debtors in connection with the Chapter 11 Proceeding after the date hereof,
which either the Parent or the Company knows have not otherwise been served on
the Buyer.

            4.5   Operation of Business. Except as otherwise contemplated by
this Agreement or the Amended Plan and, in the case of the Debtors, to the
Bankruptcy Code, the Bankruptcy Rules, the operation and information
requirements of the Office of United States Trustee, and any orders entered or
approvals or authorizations granted by the Bankruptcy Court in the Chapter 11
Proceeding during the period prior to the Closing (collectively,
"Bankruptcy-Related Requirements"), each of the Company, the Parent or the
Company, on the one hand, or the Buyer, on the other hand, shall, and shall
cause each of the other Debtors or each of the Buyer Subsidiaries, as
applicable, to, conduct its operations in the Ordinary Course of Business and in
compliance with all other applicable laws and regulations, and, to the extent
consistent therewith, use all reasonable efforts to preserve intact its current
business organization, keep its physical assets in good working condition, pay
all Taxes (all post-petition Taxes in the case of the Debtors) as they become
due and payable, maintain insurance on its business and assets (in amounts and
types consistent with past practice), keep available the services of its current
officers and employees and preserve its relationships with customers, suppliers
and others having business dealings with it to the end that its goodwill and
ongoing business shall not be impaired in any material respect.

            (a)   Without limiting the generality of the foregoing, prior to the
Closing, and, except to the extent required by any Bankruptcy-Related
Requirements, the Parent and the Company shall not and shall not permit any
other Debtor to, without the prior written consent of the Buyer and except as
otherwise contemplated by this Agreement or the Amended Plan, or as otherwise
provided in Section 4.5 of the Company Disclosure Schedule:

            (i)   except for assets not in excess of $2,500,000 in aggregate
      fair market value, sell, lease, mortgage, pledge, encumber or dispose
      (collectively, "Dispose") of any of its assets, other than in the Ordinary
      Course of Business;

            (ii)  except for borrowings under the existing DIP Loan Agreement in
      an aggregate amount outstanding at any one time equal to the sum of (x)
      amounts representing costs incurred or committed as of the date hereof in
      connection with the Company's NPCS network construction as set forth in
      Section 4.5(a) of the Company Disclosure Schedule ("NPCS Construction")
      plus any additional costs for NPCS Construction approved by the Buyer
      (which approval shall be given or withheld in writing within ten (10)
      business days after the written request for such approval) and (y) (1) at
      any time on or before December 31, 1998 up to a maximum of $20 million,
      and (2) at any time between January 1, 1999 and June 30, 1999 up to a
      maximum of $30 million, create, incur or assume any indebtedness for
      borrowed money not currently outstanding (including obligations in respect
      of capital leases); assume, guarantee, endorse or otherwise become liable
      or responsible (whether directly, contingently or otherwise) for the
      obligations of any other person; or make any loans, advances or capital
      contributions to, or investments in, any other person;

                                       42
<PAGE>

            (iii)  except for changes to Debtors' payroll program as previously
      disclosed to the Buyer, enter into, adopt or amend any Company Employee
      Benefit Plan or any employment or severance agreement or arrangement of
      the type described in Section 2.17, or (except for normal adjustments in
      the Ordinary Course of Business) increase in any material respect the
      compensation or fringe benefits of, or modify the employment terms of its
      directors, officers or employees generally or pay any benefit not required
      by the terms in effect on the date hereof of any existing Company Employee
      Benefit Plan;

            (iv)   change in any material respect its accounting methods,
      principles or practices, except insofar as may be required by a generally
      applicable change in GAAP;

            (v)    pay any pre-petition liability other than (x) liabilities in
      connection with the assumption of pre-petition contracts and with respect
      to wages, taxes, customer refunds and other related expenses that the
      Debtors are authorized to pay by the Bankruptcy Court and (y) adequate
      protection payments and the payment of the Net Cash Proceeds (as defined
      in the DIP Loan Agreement) under the Debtor Tower Agreement to the
      Pre-Petition Lenders, in each case as authorized by the Bankruptcy Court;

            (vi)   amend its certificate of incorporation, by-laws or other
      comparable organizational documents;

            (vii)  sell, assign, transfer or license any material Debtor 
      Licenses and Authorizations or Debtors' Intellectual Property, other than
      in the Ordinary Course of Business;

            (viii) enter into, materially amend, terminate, take or omit to take
      any action that would constitute a material violation of or default under,
      or waive any material rights under, any of the Debtor Licenses and
      Authorizations, or any contract or agreement which, if existing on the
      date hereof, would be required to be set forth in Section 2.13 of the
      Company Disclosure Schedule, other than in the Ordinary Course of
      Business; provided, that (x) without such consent, the Company may enter
      into the Master Lease (as defined in the Debtor Tower Agreement) and (y)
      with such consent, which shall not be unreasonably withheld, terminate the
      Debtor Tower Agreement and, in connection therewith, enter into a
      Replacement Tower Agreement and a Comparable Tower Lease;

            (ix)   make or commit to make any capital expenditure not set forth
      in the capital expense budget set forth as Section 4.5(a) to the Company
      Disclosure Schedule;

            (x)    (A) declare, set aside or pay any dividends on, or make any
      other distributions (whether in cash, securities or other property) in
      respect of, any of its outstanding capital stock (other than, with respect
      to a Debtor other than the Company, to its corporate parent), (B) split,
      combine or reclassify any of its outstanding capital stock or issue or
      authorize the issuance of any other securities in respect of, in lieu of,
      or in substitution for, shares of its

                                       43
<PAGE>

      outstanding capital stock, or (C) purchase, redeem or otherwise acquire
      any shares of outstanding capital stock or any rights, warrants or options
      to acquire any such shares;

            (xi)   issue, sell, grant or pledge any shares of its capital stock,
      any other voting securities or any securities convertible into or
      exchangeable for, or any rights, warrants or options to acquire, any such
      shares, voting securities or convertible or exchangeable securities, other
      than upon the exercise of options, or upon the conversion or exchange of
      securities, outstanding on the date of this Agreement;

            (xii)  settle or compromise any material Tax liability or any 
      pending or threatened suit or action other than consistent with the
      Company's practice since the Filing Date or pursuant to the terms of the
      Amended Plan or make any material Tax election;

            (xiii) establish, or transfer any assets to, a trust for purposes of
      funding any Debtor Employee Benefit Plan, including, without limitation, a
      so-called "rabbi trust," except as required by applicable law; or

            (xiv)  agree in writing or otherwise to take any of the foregoing
      actions.

            (b)    Without limiting the generality of the foregoing, prior to 
the Closing, the Buyer shall not, and shall not permit any Buyer Subsidiary to,
without the prior written consent of the Company, and except as otherwise
contemplated by this Agreement or the Amended Plan, or as otherwise provided in
Section 4.5 of the Buyer Disclosure Schedule:

            (i)    Dispose of any of its assets or acquire or Dispose of any
      assets or shares or other equity interests in or securities of any
      Business Entity, other than in the Ordinary Course of Business, except for
      (A) the mortgage, pledge or encumbering of such assets, shares, equity
      interests or securities pursuant to agreements existing as of the date of
      this Agreement or agreements entered into to provide funding, in whole or
      in part, for the amounts payable by the Buyer under this Agreement or the
      Amended Plan or (B) the acquisition of such assets, shares, equity
      interests or securities of any other Person with an aggregate purchase
      price not exceeding $25,000,000;

            (ii)   except for borrowings under the terms of its Second Amended
      and Restated Credit Agreement (Tranche A and Tranche C Facilities), dated
      as of June 29, 1998, by and among Arch Paging, Inc., The Bank of New York,
      Royal Bank of Canada, Toronto Dominion (Texas), Inc. and the other parties
      thereto, and its Second Amended and Restated Credit Agreement (Tranche B
      Facility), dated as of June 29, 1998, by and among Arch Paging, Inc., The
      Bank of New York, Royal Bank of Canada, Toronto Dominion (Texas), Inc. and
      the other parties thereto, each as amended from time to time, or
      borrowings to provide funding for the amounts payable by Buyer under this
      Agreement or the Amended Plan, create, incur or assume any indebtedness
      for borrowed money not currently outstanding (including obligations in
      respect of capital leases); assume, guarantee, endorse or otherwise become

                                       44
<PAGE>

         liable or responsible (whether directly, contingently or otherwise) for
         the obligations of any other person; or make any loans, advances or
         capital contributions to, or investments in, any other person;

            (iii)  change in any material respect its accounting methods,
      principles or practices, except insofar as may be required by a generally
      applicable change in GAAP;

            (iv)   amend its certificate of incorporation, by-laws or other
      comparable organizational documents;

            (v)    sell, assign, transfer or license any material Buyer Licenses
      and Authorizations or Buyer Intellectual Property, other than in the
      Ordinary Course of Business;

            (vi)   enter into, materially amend, terminate, take or omit to take
      any action that would constitute a material violation of or default under,
      or waive any material rights under, any of the Buyer Licenses and
      Authorizations or any contract or agreement which, if existing on the date
      hereof, would be required to be set forth in Section 3.13 of the Buyer
      Disclosure Schedule, other than in the Ordinary Course of Business;

            (vii)  make or commit to make any capital expenditure not set forth
      in the capital expense budget attached as Section 4.5(b) to the Buyer
      Disclosure Schedule;

            (viii) except as required under agreements existing as of the date
      of this Agreement, (A) declare, set aside or pay any dividends on, or make
      any other distributions (whether in cash, securities or other property) in
      respect of, any of its outstanding capital stock (other than, with respect
      to any Buyer Subsidiary, to its corporate parent), (B) split, combine or
      reclassify any of its outstanding capital stock or issue or authorize the
      issuance of any other securities in respect of, in lieu of or in
      substitution for shares of its outstanding capital stock, or (C) purchase,
      redeem or otherwise acquire any shares of outstanding capital stock or any
      rights, warrants or options to acquire any such shares, except, in the
      case of this clause (C), for the acquisition of shares from holders of
      options in full or partial payment of the exercise price payable by such
      holder upon exercise of options;

            (ix)   issue, sell, grant, pledge or, if outstanding as of the date
      hereof, change the material terms of, any shares of its capital stock, any
      other voting securities or any securities convertible into or exchangeable
      for, or any rights, warrants or options to acquire, any such shares,
      voting securities or convertible or exchangeable securities, other than
      pursuant to the terms of any benefit plan as in effect on the date of this
      Agreement in accordance with past practice or upon the exercise of
      options, or upon the conversion or exchange of securities, outstanding on
      the date of this Agreement;

                                       45
<PAGE>

            (x)   make any material Tax election or settle or compromise any
      material Tax liability or any pending or threatened suit or action;

            (xi)  establish, or transfer any assets to, a trust for purposes of
      funding any Buyer Employee Benefit Plan, including, without limitation, a
      so-called "rabbi trust," except as required by applicable law; or

            (xii) agree in writing or otherwise to take any of the foregoing
      actions.

            4.6   Notice of Breaches. Each Party shall promptly deliver to the
other Parties written notice of any event or development that would (a) render
any statement, representation or warranty of such Party in this Agreement
(including its respective Disclosure Schedule) inaccurate or incomplete in any
respect, or (b) constitute or result in a breach by such Party of, or a failure
by such Party to comply with, any agreement or covenant in this Agreement
applicable to such Party. No such disclosure shall be deemed to avoid or cure
any such misrepresentation or breach.

            4.7   Exclusivity.

            (a)   Except as contemplated by the Debtor Tower Agreement, from and
after the date hereof, the Parent and the Company shall not, and shall cause
each other Debtor and each of their respective directors, officers, employees,
financial advisors, representatives or agents not to, directly or indirectly,
(i) solicit, initiate, engage or participate in or encourage discussions or
negotiations with any person or entity (other than the Buyer) concerning any
merger, consolidation, sale of material assets, tender offer for,
recapitalization of or accumulation or acquisition of securities issued by any
Debtor, proxy solicitation or other business combination involving any Debtor
(collectively, "Company Acquisition Proposals") or (ii) provide any non-public
information concerning the business, properties or assets of any Debtor to any
person or entity (other than to the Buyer and to the Debtors' creditors in
accordance with existing confidentiality arrangements). The Parent and the
Company shall, and shall cause each of the other Debtors to, immediately cease
any and all existing activities, discussions or negotiations with any person
other than the Buyer with respect to any Company Acquisition Proposal. The
Parent and the Company shall immediately notify the Buyer of, and shall disclose
to the Buyer all details of, any inquiries, discussions or negotiations of the
nature described in the first sentence of this Section 4.7. The provisions of
this Section 4.7 are referred to in this Agreement as the "Exclusivity
Provisions".

            (b)   Notwithstanding the provisions of subsection (a) above, prior
to the entry of the Confirmation Order, the Debtors may, to the extent required
by the Bankruptcy-Related Requirements, or to the extent that the Board of
Directors of the Company determines, in good faith after consultation with
outside legal counsel, that such Board's fiduciary duties under applicable law
require it to do so, participate in discussions or negotiations with, and,
subject to the requirements of paragraph (c) below, furnish information to any
person, entity or group after such person, entity or group has delivered to the
Debtors, in writing, an unsolicited bona fide offer to effect a Company
Acquisition Proposal that the Board of Directors of the Company in its good
faith judgment

                                       46
<PAGE>

determines, after consultation with its independent financial advisors, would
result in a transaction more favorable to the stakeholders of the Debtors from a
financial point of view than the transactions contemplated hereby and for which
financing, to the extent required, is then committed (or which, in the good
faith judgment of such Board, is reasonably capable of being obtained) and which
(in the good faith judgment of such Board) is likely to be consummated (a
"Company Superior Proposal"). In the event the Debtors receive a Company
Superior Proposal, nothing contained in this Agreement (but subject to the terms
hereof) will prevent the Board of Directors of the Company from approving such
Company Superior Proposal or requesting authorization of such Company Superior
Proposal from the Bankruptcy Court, if such Board determines, in good faith,
after consultation with outside legal counsel, that such action is required by
its fiduciary duties under applicable law; in such case, the Board of Directors
of the Company may terminate this Agreement pursuant to Section 6.1(e) hereof;
provided, however, that the Company shall not terminate this Agreement until at
least 48 hours after the Buyer's receipt of a copy of such Company Superior
Proposal.

            (c)   Notwithstanding anything to the contrary in this Section 4.7,
the Parent and the Company shall not, and shall cause each of the other Debtors
not to, provide any non-public information to a third party unless: (i) the
Debtors provide such non-public information pursuant to a non-disclosure
agreement with terms regarding the protection of confidential information at
least as restrictive as such terms in the Confidentiality Agreements between the
Parent and the Buyer dated March 26, 1998 and June 10, 1998 (the
"Confidentiality Agreement"); and (ii) such non-public information has
previously been delivered or made available to the Buyer.

            (d)   Except as contemplated by the Asset Purchase and Sale
Agreement between certain subsidiaries of Arch Communications Group, Inc., and
OmniAmerica, Inc., dated April 10, 1998, from and after the date hereof the
Buyer shall not, and shall cause each Buyer Subsidiary and each of their
respective directors, officers, employees, financial advisors, representatives
or agents not to, directly or indirectly, (i) solicit, initiate, engage or
participate in or encourage discussions or negotiations with any person or
entity (other than the Parent, the Company and, in connection with the
transactions contemplated by this Agreement, the Official Committee of Unsecured
Creditors of the Company) concerning any merger (other than mergers of the Buyer
Subsidiaries in connection with acquisitions of other businesses by the Buyer
(x) with a fair market value not in excess of $25,000,000 and (y) that would not
upon the closing thereof be in breach of the Buyer's obligations under Section
4.5), consolidation, sale of material assets, tender offer for, recapitalization
of or accumulation or acquisition of securities issued by the Buyer or any of
the Buyer Subsidiaries, proxy solicitation or other business combination (other
than business combinations of the Buyer Subsidiaries in connection with
acquisitions of other businesses by the Buyer (x) with a fair market value not
in excess of $25,000,000 and (y) that would not upon the closing thereof be in
breach of the Buyer's obligations under Section 4.5), involving the Buyer or any
Buyer Subsidiary (collectively, "Buyer Acquisition Proposals") or (ii) except as
permitted by the foregoing clause (i), provide any non-public information
concerning the business, properties or assets of the Buyer or any Buyer
Subsidiary to any person or entity (other than the Debtors or any of the Buyer's
financing sources). The Buyer and the Buyer Subsidiaries will immediately cease
any and all existing activities, discussions or negotiations with any person
other than the Company with respect to any Buyer Acquisition Proposal. The Buyer

                                       47
<PAGE>

shall immediately notify the Company of, and shall disclose to the Company all
details of, any inquiries, discussions or negotiations of the nature described
in the first sentence of this Section 4.7(d).

            (e)   Notwithstanding the provisions of subsection (d) above, prior
to the Meeting (as defined in Section 4.12), the Buyer may, to the extent that
the Board of Directors of the Buyer determines, in good faith, after
consultation with outside legal counsel, that such Board's fiduciary duties
under applicable law require it to do so, participate in discussions or
negotiations with, and, subject to the requirements of paragraph (f) below,
furnish information to any person, entity or group after such person, entity or
group has delivered to the Buyer, in writing, an unsolicited bona fide offer to
effect a Buyer Acquisition Proposal that the Board of Directors of the Buyer in
its good faith judgment determines, after consultation with its independent
financial advisors, would result in a transaction more favorable to the
shareholders of the Buyer from a financial point of view than the transactions
contemplated hereby and for which financing, to the extent required, is then
committed (or which, in the good faith judgment of such Board, is reasonably
capable of being obtained) and which (in the good faith judgment of such Board)
is likely to be consummated (a "Buyer Superior Proposal"). In the event the
Buyer receives a Buyer Superior Proposal, nothing contained in this Agreement
(but subject to the terms hereof) will prevent the Board of Directors of the
Buyer from recommending to the Buyer's shareholders such Buyer Superior Proposal
if such Board determines, in good faith, after consultation with outside legal
counsel, that such action is required by its fiduciary duties under applicable
law.

            (f)   Notwithstanding anything to the contrary in this Section 4.7,
the Buyer shall not provide any non-public information to a third party unless:
(i) the Buyer provides such non-public information pursuant to a non-disclosure
agreement with terms regarding the protection of confidential information at
least as restrictive as such terms in the Confidentiality Agreement; and (ii)
such non-public information has previously been delivered or made available to
the Company.

            4.8   Breakup Fee Provisions. (a) In the event that (i) the Buyer
terminates this Agreement pursuant to Section 6.1(b) or Section 6.1(i) or (ii)
the Company or the Buyer terminates this Agreement pursuant to Section 6.1(c) or
6.1(d) (in either case as a result of the failure of the condition set forth in
Section 5.1(h) to be satisfied due to (A) the failure of the creditors of the
Debtors entitled to vote on the Amended Plan (other than holders of Class 7, 8
or 9 Claims) to vote in favor of the Amended Plan, (B) the withdrawal of the
Amended Plan by the Debtors, the filing of any other plan of reorganization by
the Debtors, or the modification or amendment of any material provision of the
Amended Plan by the Debtors, in each case without the prior written consent of
the Buyer, or (C) the confirmation of any other plan of reorganization filed by
any person other than the Debtors), (iii) except as set forth in Section 4.8(a)
of the Company Disclosure Schedule, the Debtors sell or otherwise transfer
(other than to the Buyer or the Buyer Subsidiaries) all or any substantial
portion of their assets as part of a sale approved pursuant to Section 363 of
the Bankruptcy Code, (iv) the Company has terminated this Agreement pursuant to
Section 6.1(e) (a termination under (i), (ii), (iii) or (iv) being herein called
a "Major Breakup Event"), or (v) the Buyer or the Company terminates this
Agreement pursuant to Section 6.1(j) (a "Minor Breakup Event"; together with the

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<PAGE>

Major Breakup Events, the "Breakup Events"), and at the time of any such Breakup
Event the Buyer is not in material breach of any material covenant or obligation
required to be performed by the Buyer hereunder at or before such time, and is
not in breach of its representations and warranties contained in this Agreement
(except where the matters in respect of which such representations and
warranties are in breach would not in the aggregate have a Buyer Material
Adverse Effect), then the Company shall pay to the Buyer as promptly as
practicable after demand therefor (but in no event later than the third Business
Day thereafter and, in the case of a Minor Breakup Event, only if and when any
Pinnacle Breakup Amount referred to below is actually received by the Debtors)
(x) in the case of a Major Breakup Event, the amount of $25,000,000, and (y) in
the case of a Minor Breakup Event, an amount equal to one-half of any amount
("Pinnacle Breakup Amount") actually received by the Debtors pursuant to Section
7.05 of the Debtor Tower Agreement (or pursuant to a settlement with Pinnacle in
lieu thereof) (in either case, the "Buyer Breakup Fee"). The claims of the Buyer
to the Buyer Breakup Fee shall constitute a first priority administrative
expense under 11 U.S.C. ss. 507(a)(1).

            (b)   In the event that (i) the Company terminates this Agreement
pursuant to Section 6.1(b) or (g), or (ii) the Buyer or the Company terminates
this Agreement after June 30, 1999 pursuant to Section 6.1(c) or (d) (in either
case as a result of the Closing not occurring due to the Buyer's failure to
obtain the financing necessary to effect the transactions contemplated hereby
and by the Amended Plan under circumstances when all the conditions set forth in
Section 5.1 (other than the condition set forth in Section 5.1(j)) and Section
5.2 are satisfied, or would have been satisfied had such financing been
obtained) and at the time of such termination each of the Company and the Parent
is not in material breach of any material covenant or obligation required to be
performed by the Company or the Parent hereunder at or before such time and is
not in breach of its representations and warranties contained in this Agreement
(except where the matters in respect of which such representations and
warranties are in breach would not in the aggregate have a Debtor Material
Adverse Effect), then the Buyer shall pay to the Company as promptly as
practicable after demand therefor (but in no event later than the third Business
Day thereafter) the amount of $32,500,000 (the "Company Breakup Fee").

            (c)   This Section 4.8 shall be effective only from and after the
date the Initial Merger Order is signed by the Bankruptcy Court.

            4.9   Nasdaq National Market Quotation. The Buyer shall use its best
efforts to have the shares of Buyer Common Stock (including all such shares
issuable upon conversion of the Buyer Class B Common Stock and upon exercise of
the Buyer Warrants) and Buyer Warrants to be issued as contemplated in the
Amended Plan and this Agreement approved for quotation on the Nasdaq National
Market prior to the Closing.

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<PAGE>

            4.10  Delivery of Financial Statements. As promptly as possible
following the last day of each month after the date of this Agreement until the
Closing Date, and in any event within 35 days after the end of each such month,
each of the Buyer and the Company shall deliver to the other its unaudited
consolidated balance sheet and the related consolidated statements of operations
and cash flows for the one-month period then ended, all certified by its chief
financial officer to the effect that such interim financial statements are
prepared in accordance with GAAP (except as otherwise described therein) on a
consistent basis as with each Party's audited financial statements and fairly
present the consolidated financial condition and results of operations of each
Party as of the date thereof and for the period covered thereby (collectively,
the "Interim Monthly Financial Statements"). As promptly as possible following
the last day of each fiscal quarter, and in any event within 45 days after the
end of each such quarter, each of the Buyer and the Company shall deliver to the
other its unaudited consolidated balance sheet and the related unaudited
consolidated statements of operations and cash flows for the year-to-date period
then ended, prepared in accordance with GAAP (except as otherwise described
therein) applied on a consistent basis as with the Audited Financial Statements,
which comply as to form with the applicable accounting requirements and the
published rules and regulations of the SEC with respect thereto (collectively,
the "Unaudited Quarterly Financial Statements"). The Company shall furnish the
Buyer with all information (including, without limitation, the Audited Financial
Statements and the Unaudited Quarterly Financial Statements, pro forma financial
information and projections included in the Disclosure Statement) and shall take
such other action including obtaining any necessary consents and comfort letters
(in customary form and scope) from its accountants, as the Buyer may reasonably
request in connection with any offering of securities of the Buyer used to fund
the amounts to be paid by the Buyer under the Amended Plan or the working
capital requirements of the Buyer following the Closing.

            4.11  Full Access. Each of the Buyer, the Parent and the Company
shall permit representatives of the other to have full access (at all reasonable
times, and in a manner so as not to interfere with normal business operations)
to all premises, properties, financial and accounting records, contracts, other
records and documents, and personnel, of or pertaining to such Party. Each of
the Buyer, the Parent and the Company shall cause its officers and management to
cooperate fully with the representatives and agents of such other Party and
shall make themselves available to the extent reasonably necessary to complete
the due diligence process and the consummation of the transactions contemplated
hereby. The Parent and the Company shall, at the request of the Buyer, introduce
the Buyer to its principal suppliers and employees to facilitate discussions
between such persons and the Buyer in regard to the conduct of the businesses of
the Surviving Corporation following the Closing.

            4.12  Stockholders Approval; Meeting. The Buyer shall take all
action reasonably necessary in accordance with applicable law, the rules of the
Nasdaq National Market, this Agreement and the Buyer's Restated Certificate of
Incorporation, as amended, and By-laws, as amended, duly to convene a meeting of
its stockholders (the "Meeting") as promptly as practicable to consider and vote
upon (i) the Buyer Charter Amendment in the form attached as Exhibit F hereto
(the "Buyer Charter Amendment") and (ii) the Buyer Share Issuance. The Buyer
will (i) subject to Section 4.7(e),

                                       50
<PAGE>

recommend in the Proxy Statement (as defined in Section 4.13(a)) that its
stockholders vote in favor of the Buyer Charter Amendment and the Buyer Share
Issuance (the "Buyer Recommendation") and (ii) subject to Section 4.7(e), use
its best efforts to cause to be solicited proxies from stockholders of the Buyer
to be voted at the Meeting in favor of the Buyer Charter Amendment and the Buyer
Share Issuance and to take all other actions necessary or advisable to secure
the vote or consent of stockholders required to approve the Buyer Charter
Amendment and the Buyer Share Issuance.

            4.13  Proxy Statement, Disclosure Statement, Etc.

            (a)   The Buyer shall promptly after execution of this Agreement
prepare and file with the SEC under the Exchange Act, and shall use its best
efforts to have cleared by the SEC and shall thereafter promptly mail to its
stockholders, a proxy statement for the Meeting (the "Proxy Statement"). The
Proxy Statement shall be mailed to stockholders of the Buyer at least 20
business days in advance of the date of the Meeting. The Company shall furnish
the Buyer with all information (including, without limitation, its Audited
Financial Statements and the Unaudited Quarterly Financial Statements, pro forma
financial information and projections included in the Disclosure Statement) and
shall take such other action (including obtaining any necessary consents from
the accountants) as the Buyer may reasonably request in connection with the
Proxy Statement. The Buyer shall consult with the Company and its counsel in
connection with, and shall permit the Company and its counsel to participate in,
the preparation of the Proxy Statement.

            (b)   The Buyer shall promptly notify the Company of the receipt of
the comments of the SEC and of any requests by the SEC for amendments or
supplements to the Proxy Statement or for additional information, and shall
promptly supply the Debtors with copies of all correspondence between it (or its
representatives) and the SEC (or its staff) with respect thereto, and shall
permit counsel for the Company to participate in any telephone conferences or
meetings with the staff of the SEC. If, at any time prior to the Meeting, any
event should occur relating to or affecting a Party or its officers or
directors, which event should be described in an amendment or supplement to the
Proxy Statement, such Party shall promptly inform the other Party and shall
cooperate in promptly preparing, filing and clearing with the SEC and, if
required by applicable securities law, mailing to the Buyer's stockholders, as
the case may be, such amendment or supplement.

            (c)   The Buyer shall furnish the Company with all information
(including historical and pro forma financial information and projections of the
Buyer) and shall take such other action as the Company may reasonably request in
connection with the Disclosure Statement. The Company shall consult with the
Buyer and its counsel in connection with, and shall permit the Buyer and its
counsel to participate in, the preparation and Bankruptcy Court approval process
of the Disclosure Statement and any amendments or supplements thereto.

            4.14  Application of Pinnacle Proceeds. The Buyer, the Parent and
the Company agree that the net proceeds from the Closing (as defined in the
Debtor Tower Agreement) shall promptly be paid to the Pre-Petition Agent for the
benefit of the Pre-Petition Lenders.

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<PAGE>

            4.15  FCC Filing. As soon as practicable following the date of this
Agreement and in no event later than the later to occur of the date fifteen days
following the execution hereof or the date ten days following the filing with
the Bankruptcy Court of the Amended Plan, the Parties shall jointly prepare and
file applications (the "FCC Applications") on the appropriate FCC forms in
accordance with all applicable FCC rules and regulations requesting (i) the
FCC's consent to the transfer of the control of the Debtor Authorizations to the
Buyer, (ii) to the extent that such consent is required, the FCC's consent to
the transfer of control of the Buyer Authorizations from the Buyer's current
stockholders to the Buyer's stockholders immediately following the consummation
of the transactions contemplated hereby in accordance with the Amended Plan,
(iii) the termination of the hearing in WT Docket No. 97-115, In the Matter of
MobileMedia Corporation, et al. (the "Hearing") without any further findings
adverse to the Debtors, or to the Debtor Authorizations or otherwise materially
restricting the Buyer's or the Reorganized Debtors' ability to own or operate
the properties, assets and businesses of the Debtors following the Closing, and
(iv) the grant to the Buyer of permanent license authority to operate those
stations listed on Attachment C of Public Notice DA 97- 78 (January 13, 1997)
(the "Attachment C Stations"), as to which Debtors are currently operating under
a grant of interim operating authority, or in the alternative, a determination
by the FCC that as to such stations, the Buyer will enjoy protection from, and
rights of incumbency as to, any future Market Area Licensee authorized to
operate on the frequencies licensed under interim operating authority. The
Parties shall cooperate in providing all information and taking all steps
necessary to expedite the preparation, filing and prosecution of the FCC
Applications with the FCC. In the event any person or entity petitions the FCC
to deny any FCC Application, or petitions for any further proceedings in the
Hearing, or otherwise challenges the grant of any FCC Application before the
FCC, or in the event the FCC approves the transfer of control of the Debtor
Authorizations (and, if necessary, the Buyer Authorizations), and any person
requests reconsideration or judicial review of such order, then the Parties
shall take such reasonable actions as are necessary to oppose such petition or
challenge before the FCC or defend such action and the order of the FCC before
the judiciary diligently and in good faith; provided, however, that nothing
contained herein shall be deemed to require the Buyer to intervene in the
Hearing or otherwise to defend the Debtors as to any allegations or proceedings
relating to the allegations before the FCC in the Hearing, except as reasonably
required to support the transfer of control of the Debtor Authorizations to the
Buyer. The Company shall provide the Buyer (whether or not the Buyer intervenes
or otherwise participates in the Hearing) with reasonable advance notice of, and
a right to participate in, any meetings or hearings relating to the FCC
Applications or the Hearing, and a right to review in advance any
correspondence, agreements, or pleadings which may be submitted by the Debtors
to the FCC or any other party to the Hearing with regard to the FCC Applications
or any proceedings relating to the Hearing. In each such case, each Party shall
bear its own costs and expenses of prosecuting such application to a favorable
conclusion, to the end that the transactions contemplated by this Agreement and
the Amended Plan may be consummated.

            The Parent and the Company each covenants that it will continue to
use reasonable best efforts to complete the program, voluntarily undertaken by
the Debtors and monitored by its independent regulatory consultant, to inspect
and audit the Debtors' transmitter site facilities and

                                       52
<PAGE>

license data, within the time frames established by Debtors' independent
regulatory consultant and reported to the FCC, and will provide Buyer with
periodic updates of the progress of the program, including copies of status
reports prepared by the Debtors' independent regulatory consultant and furnished
to the Company's Board of Directors.

            4.16  Indemnification; Director and Officers Insurance. (a) The
Buyer agrees that, to the extent set forth in the Amended Plan and only to such
extent, all rights to indemnification and exculpation from liabilities for acts
or omissions occurring prior to the Effective Time now existing in favor of the
current or former directors or officers of the Debtors as provided in their
respective charters or by-laws (or comparable organization documents) and any
indemnification agreements of the Debtors (including with Alvarez & Marsal,
Inc.) shall survive the Merger and shall continue in full force and effect in
accordance with their terms for a period of not less than three years from the
Effective Time and the obligations of the Debtors in connection therewith shall
be assumed by the Buyer. To the extent set forth in the Amended Plan and only to
such extent, the Buyer shall provide, or shall cause the Surviving Corporation
to provide, the Debtors' current directors and officers an insurance and
indemnification policy (including any fiduciary liability policy) that provides
coverage with respect to any claims made during the three-year period following
the Effective Time for events occurring prior to the Effective Time.

            (b)   The provisions of this Section 4.16 are intended to be for the
benefit of, and shall be enforceable by, each person who is or has been a
director or officer of any of the Debtors (except for such Persons who are not
entitled to indemnification as provided for in the Amended Plan) and such
director's or officer's heirs and personal representatives and shall be binding
on all successors and assigns of the Buyer and the Surviving Corporation.

            4.17  State Takeover Laws. If any "fair price", "business
combination" or "control share acquisition" statute or other similar statute or
regulation shall become applicable to the transactions contemplated hereby, the
Buyer, the Parent and the Company and their respective Boards of Directors shall
use all reasonable efforts to grant such approvals and take such actions as are
necessary so that the transactions contemplated hereby may be consummated as
promptly as practicable on the terms contemplated hereby and shall otherwise act
to minimize the effects of any such statute or regulation on the transactions
contemplated hereby.

            4.18  Employees.

            (a)   Buyer's Benefits for Affected Employees. As promptly as
practicable following the Effective Time, the Buyer shall transfer to one or
more employee benefit plans maintained by the Buyer any employee of the Parent,
the Company or any of the Company's Subsidiaries who becomes an employee of the
Buyer or any of its Subsidiaries (collectively, the "Affected Employees"). Prior
to such transfer, the Buyer shall maintain, or shall cause the Company and its
Subsidiaries to maintain, compensation and employee benefits plans and
arrangements for the Affected Employees that are comparable to those provided
for under the compensation arrangements and Company Employee Benefit Plans as in
effect on the date hereof; provided, that for such period, the Buyer shall not
reduce

                                       53
<PAGE>

the severance benefits payable to any terminated employee or Affected Employee
below the level currently provided to such terminated employee or Affected
Employee by the Company. Notwithstanding the foregoing, the Buyer shall have the
right, following the Effective Time, in the good faith exercise of its
managerial discretion, to terminate the employment of any employee. Nothing in
this Agreement shall be construed as granting to any employee any rights of
continuing employment.

            (b)   Honoring Accrued Vacation and 1998 Employee Incentive Plan.
Without limiting the generality of the foregoing subsection, and to the extent
permitted by law, the Buyer shall (i) honor all vacation, holiday, sickness and
personal days accrued by Affected Employees and, to the extent applicable,
former employees of the Parent, the Company and its Subsidiaries ("Former
Employees") as of the Effective Time and (ii) for purposes of the Company's 1998
Employee Incentive Plan, in the event the payments under the 1998 Employee
Incentive Plan would be paid or payable after the Closing, (x) use the
evaluations of the executives covered by such plan prepared in good faith, and
to be provided by the Company to the Buyer at least five business days prior to
the Closing and (y) calculate the Company's 1998 EBITDA in a manner consistent
with the Company's current accounting practices, in connection with the 1998
Employee Incentive Plan and without deduction for any restructuring or other
special or one-time charge relating to the transactions contemplated by this
Agreement.

            (c)   Participation in Benefit Plans. Employees and, to the extent
applicable, Former Employees shall be given credit, to the extent permitted by
law, for all service with the Parent, the Company and its Subsidiaries (or
service credited by the Company or such Subsidiaries) under all Buyer Employee
Benefit Plans currently maintained by the Buyer or any of its Subsidiaries in
which they are or become participants for purposes of eligibility, vesting,
level of participant contributions and benefit accruals (but subject to an
offset, if necessary, to avoid duplication of benefits) to the same extent as if
rendered to the Buyer or any of its Subsidiaries other than as otherwise
provided in clause (a) or (b) of this Section 4.18. The Buyer shall cause to be
waived any pre-existing condition limitation under its welfare plans that might
otherwise apply to an Affected Employee or, to the extent applicable, a Former
Employee. The Buyer agrees to recognize (or cause to be recognized) the dollar
amount of all expenses incurred by Affected Employees or, to the extent
applicable, Former Employees, during the calendar year in which the Effective
Time occurs for purposes of satisfying the calendar year deductions and
co-payment limitations for such year under the relevant benefit plans of the
Buyer and the Buyer Subsidiaries.

            4.19  Rights Agreement. The Buyer shall not (i) amend the Rights
Agreement or (ii) take any action with respect to, or make any determination
under, the Rights Agreement (including a redemption of the Preferred Rights)
with the purpose of facilitating a Buyer Acquisition proposal.

                                       54
<PAGE>

            4.20  Buyer Rights Offering; Registration Statement. (a) As
specified in the Amended Plan, the Buyer will issue (the "Rights Offering") to
the holders of certain Allowed Claims as specified in the Amended Plan the
Rights to purchase, for an aggregate consideration of $217 million, shares of
Buyer Common Stock, Buyer Class B Common Stock, if applicable, and Buyer
Warrants. The Rights Offering will be made substantially on the terms set forth
in Schedule III hereto.

            (b)   Concurrently with the execution of this Agreement, the Company
and the Buyer have entered into a Standby Purchase Commitment with each Standby
Purchaser and, prior to or at the Closing, the Buyer will execute and deliver to
each of the Standby Purchasers the Registration Rights Agreement.

            (c)   The Buyer will file with the SEC a registration statement as
required under the Securities Act to effect the Rights Offering as contemplated
hereby (the "Registration Statement") as promptly as practicable (in any event
within 15 days) after the date of this Agreement, and the Buyer will use its
best efforts to have the Registration Statement declared effective by the SEC as
promptly as practicable thereafter. The Buyer shall also take any action
required to be taken under state blue sky laws or other securities laws in
connection with the Rights Offering. The Parent and the Company shall furnish
the Buyer with all information (including, without limitation, the Audited
Financial Statements and the Unaudited Quarterly Financial Statements, pro forma
financial information and projections included in the Disclosure Statement) and
shall take such other action, including obtaining any necessary consents and
comfort letters (in customary form and scope) from its accountants, as the Buyer
may reasonably request in connection with the Registration Statement. The Buyer
shall consult with the Parent and the Company and its counsel in connection
with, and shall permit the Parent and the Company and its counsel to participate
in, the preparation of the Registration Statement. The Buyer shall cause the
Rights to be issued as specified in the Amended Plan as soon as practicable
after the date the Registration Statement becomes effective but not before
approval of Disclosure Statement by the Bankruptcy Court.

            (d)   The Buyer shall promptly notify the Parent and the Company of
the receipt of the comments of the SEC and of any requests by the SEC for
amendment or supplements to the Registration Statement or for additional
information, and shall promptly supply the Parent and the Company with copies of
all correspondence between it (or its representatives) and the SEC (or its
staff) with respect thereto, and shall permit counsel for the Parent and the
Company to participate in any telephone conferences or meetings with the staff
of the SEC. If, at any time prior to the Effective Date, any event should occur
relating to or affecting a Party or its officers or directors, which event
should be described in an amendment or supplement to the Registration Statement,
such Party shall promptly inform the other Party and shall cooperate in promptly
preparing, filing and clearing with the SEC and, if required by applicable
securities law, distributing such amendment or supplement.

                                       55
<PAGE>

            4.21  Reimbursement of Buyer's Expenses. As soon as practicable
after the date of receipt of the Initial Merger Order (but in no event later
than the third Business Day thereafter), the Company shall pay to the Buyer, by
wire transfer to a bank account of the Buyer specified in a prior written notice
from the Buyer to the Company, $500,000 in next day funds in partial
reimbursement of the Buyer's expenses in connection with the negotiation and
execution of this Agreement (the "Buyer Reimbursement").


                                    ARTICLE V

                              CONDITIONS TO CLOSING

            5.1   Conditions to Obligations of Each Party. The respective
obligation of each Party to consummate the transactions to be performed by it in
connection with the Closing is subject to the satisfaction, or waiver by such
Parties, of the following conditions:

            (a)   each of the Buyer Charter Amendment and the Buyer Share
      Issuance shall have been approved by the requisite vote of the holders of
      Buyer Stock in accordance with the DGCL and the restated certificate of
      incorporation, as amended, and by-laws, as amended, of the Buyer;

            (b)   no statute, rule, order, decree or regulation shall have been
      enacted or promulgated by any foreign or domestic Governmental Entity
      which prohibits the consummation of the transactions contemplated hereby
      and all consents, orders and approvals from all Governmental Entities and
      other persons or entities listed in Section 2.3 of the Company Disclosure
      Schedule or Section 3.3 of the Buyer Disclosure Schedule shall have been
      obtained and shall be in effect;

            (c)   there shall be no order or injunction of a foreign or United
      States federal or state court or other governmental authority of competent
      jurisdiction in effect precluding, restraining, enjoining or prohibiting
      consummation of the transactions contemplated hereby;

            (d)   the expiration or early termination of any waiting period
      under the HSR Act shall have occurred;

            (e)   (1) the FCC shall have issued an order (the "FCC Grant") both
      (i) consenting to the transfer of the Debtor Authorizations and, to the
      extent requested by the Parties, to the transfer of the Buyer
      Authorizations without any conditions that would have a Buyer FCC Material
      Adverse Effect (as defined below in this Section 5.1(e)) or a Debtor FCC
      Material Adverse Effect (as defined below in this Section 5.1(e)) and (ii)
      terminating the Hearing without any findings or conclusions (x) that are
      materially adverse to the Reorganized Debtors or the Debtor Authorizations
      or which would have a material adverse effect on the

                                       56
<PAGE>

      use of the Debtor Authorizations by the Reorganized Debtors following the
      Closing, or (y) which impose any material monetary forfeiture on the
      Debtors or the Reorganized Debtors or retain jurisdiction to impose any
      material monetary forfeitures in the future on the Buyer or the
      Reorganized Debtors based on the activities of the Debtors prior to the
      Closing, or (z) which would have a Buyer FCC Material Adverse Effect or a
      Debtor FCC Material Adverse Effect; and (2) either (i) the FCC Grant has
      become a Final Order (as defined below in this Section 5.1(e)) or (ii)(a)
      any condition or conditions under the Bank Lending Documents to the effect
      that the FCC Grant shall have become a Final Order (or any condition or
      conditions therein having a substantially similar effect) shall have been
      satisfied or, if not satisfied, the Bank Lenders shall have waived any
      such condition or conditions (or any such condition or conditions having a
      substantially similar effect) and (b) any condition or conditions under
      the Other Lending Documents to the effect that the FCC Grant shall have
      become a Final Order (or any condition or conditions therein having a
      substantially similar effect) shall have been satisfied or, if not
      satisfied, the Other Lenders shall have waived any such condition or
      conditions (or any such condition or conditions having a substantially
      similar effect); it being agreed that, for purposes of this Section 5.1(e)
      and Section 5.1(h), (A) "Bank Lenders" shall mean, collectively, the
      Existing Lenders (as defined in the Bank Commitment Letter) and the Credit
      Parties (as so defined), as the same in each case shall exist at the
      Closing, (B) "Bank Lending Documents" shall mean the Existing Credit
      Agreements (as defined in the Bank Commitment Letter) as amended and
      modified by the Amendments (as so defined), (C) "Bank Commitment Letter"
      shall mean the Commitment Letter of even date herewith between Arch
      Paging, Inc. and the Credit Parties, including the Term Sheet (as defined
      in such Bank Commitment Letter), copies of which has been delivered to the
      Company by the Buyer, as the same may be amended or modified, (D) "Other
      Lenders" shall mean the Lenders (as defined in the Bridge Commitment
      Letter), as the same shall exist at the Closing, or, if applicable, any
      other lenders which lend funds to Arch Communications, Inc. (or the Buyer
      or any other Buyer Subsidiary) pursuant to a Substitute Loan Agreement (as
      defined below), (E) "Other Lending Documents" shall mean the Bridge
      Commitment Letter, Bridge Loan Agreement (as defined in the Bridge
      Commitment Letter) or any other loan agreement, indenture or similar
      agreement (the "Substitute Loan Agreement") entered into by the Buyer or
      any Buyer Subsidiary in lieu thereof for purposes of funding a material
      portion of the consideration required by the Buyer for the transactions
      contemplated by this Agreement, (F) "Bridge Commitment Letter" shall mean
      the Bridge Commitment Letter, the Bridge Fee Letter and the Bridge
      Engagement Letter, each of even date herewith, between the Buyer and Arch
      Communications, Inc., on the one hand, and the Other Lenders, on the other
      hand, a copy of which has been delivered by the Buyer to the Company, as
      the same may be amended or modified, (G) "Buyer FCC Material Adverse
      Effect" shall mean a material adverse effect on the financial condition
      and operating income of the Buyer and its subsidiaries, taken as a whole,
      excluding any effect generally applicable to the economy or the industry
      in which Buyer conducts its business, and (H) "Debtor FCC Material Adverse
      Effect" shall mean a material adverse effect on the financial condition
      and operating income of the Debtors, taken as a whole, excluding any
      effect generally applicable to the economy or the industry in which the
      Company conducts its business; and it being further agreed that, for

                                       57
<PAGE>

      purposes of this Section 5.1(e), the FCC Grant shall become a "Final
      Order" when no request for a stay is pending, no stay is in effect and any
      deadline for filing such a request that may be designated by statute or
      regulation is past; no petition for rehearing or reconsideration or
      application for review is pending and the time for filing any such
      petition or application is passed; the FCC does not have the action or
      decision under reconsideration on its own motion and the time for
      initiating any such reconsideration that may be designated by statute or
      rule has passed; and no appeal is pending or in effect and any deadline
      for filing any such appeal that may be designated by statute or rule has
      passed;

            (f)   the Registration Statement shall have been declared effective
      and no stop order with respect thereto shall be in effect;

            (g)   the shares of Buyer Common Stock (including all such shares
      issuable upon conversion of the Buyer Class B Common Stock and the Buyer
      Warrants) to be issued as contemplated by the Amended Plan and this
      Agreement shall have been approved for quotation on the Nasdaq National
      Market;

            (h)   (1) the Confirmation Order (which shall authorize and approve
      the assumption by the Debtors of the Assumed Contracts), in a form
      reasonably satisfactory to each of the Parties, shall have been entered by
      the Bankruptcy Court; and (2) either (i) the Confirmation Order has become
      a Final Order (as defined below in this Section 5.1(h)) or (ii) (a) any
      condition or conditions under the Bank Lending Documents to the effect
      that the Confirmation Order shall have become a Final Order (or any
      condition or conditions therein having a substantially similar effect)
      shall have been satisfied or, if not satisfied, the Bank Lenders shall
      have waived any such condition or conditions (or any such condition or
      conditions having a substantially similar effect), and (b) any condition
      or conditions under the Other Lending Documents to the effect that the
      Confirmation Order shall have become a Final Order (or any condition or
      conditions therein having a substantially similar effect) shall have been
      satisfied or, if not satisfied, the Other Lenders shall have waived any
      such condition or conditions (or any such condition or conditions having a
      substantially similar effect), it being agreed that, for purposes of this
      Section 5.1(h), the Confirmation Order shall become a "Final Order" when
      it shall have been in full force and effect for eleven days without any
      stay or material modification or amendment thereof, and when the time to
      appeal or petition for certiorari designated by statute or regulation has
      expired and no appeal or petition for certiorari is pending or, if an
      appeal or petition for certiorari has been timely filed or taken, the
      order or judgment of the tribunal has been affirmed (or such appeal or
      petition has been dismissed as moot) by the highest court (or other
      tribunal having appellate jurisdiction over the order or judgment) to
      which the order was appealed or the petition for certiorari has been
      denied, and the time to take any further appeal or to seek further
      certiorari designated by statute or regulation has expired;

                                       58
<PAGE>

            (i)   no action, suit or proceeding shall be pending or threatened
      by any Governmental Entity challenging the validity of the actions taken
      by the Buyer, the Debtors or any of their respective Subsidiaries in
      connection with the confirmation of the Amended Plan;

            (j)   the Effective Date (as defined in the Amended Plan) shall have
      occurred; and

            (k)   the Plan Shares to be issued and distributed as contemplated
      by Section 1.3(e) and Section 1.6 shall, when so issued and distributed,
      be (i) issued and distributed pursuant to the exemption from registration
      under the Securities Act provided by Section 1145 of the Bankruptcy Code,
      (ii) freely tradeable by holders thereof who are not then affiliates of
      the Buyer or "underwriters" under the Securities Act or 1145(b)(1) of the
      Bankruptcy Code and, (iii) except for certificates issuable to such
      affiliates or underwriters, represented by certificates bearing no
      restrictive legend.

            5.2   Conditions to Obligations of the Buyer. The obligation of the
Buyer to consummate the transactions to be performed by the Buyer in connection
with the Closing is subject to the satisfaction, or waiver by the Buyer, of the
following conditions:

            (a)   the representations and warranties of the Parent and the
      Company contained in this Agreement, which representations and warranties
      shall be deemed for purposes of this Section 5.2(a) not to include any
      qualification or limitation with respect to materiality (whether by
      reference to a "Debtor Material Adverse Effect" or otherwise), shall be
      true and correct as of the Effective Time, with the same effect as though
      such representations and warranties were made as of the Effective Time,
      except where the matters in respect of which such representations and
      warranties are not true and correct, result from actions permitted by this
      Agreement or would not in the aggregate have a Debtor Material Adverse
      Effect;

            (b)   the Parent and the Company shall each have performed or
      complied with its material agreements and covenants required to be
      performed or complied with under this Agreement as of or prior to the
      Closing in all material respects;

            (c)   there shall not have occurred between the Agreement Date and
      the Closing Date a Debtor Material Adverse Effect;

            (d)   the Parent and the Company shall have delivered to the Buyer a
      certificate (without qualification as to knowledge or materiality or
      otherwise) to the effect that each of the conditions specified in clauses
      (a) through (c) of this Section 5.2 is satisfied in all respects;

                                       59
<PAGE>

            (e)   after the Registration Statement has been declared effective,
      the Rights Offering shall have expired and the Buyer shall have received
      aggregate proceeds therefrom (and/or from the closings contemplated by the
      Standby Purchase Commitments) of $217.0 million; and

            (f)   the Debtors shall have on or prior to the Closing Date paid to
      the Pre-Petition Agent for the benefit of the Pre-Petition Lenders at
      least $165 million in net proceeds under the Debtor Tower Agreement or a
      Replacement Tower Agreement (the "Company Tower Sale Proceeds").

            5.3   Conditions to Obligations of the Company. The obligations of
the Parent and the Company to consummate the transactions to be performed by
each of them in connection with the Closing is subject to the satisfaction, or
waiver by the Parent and the Company, of the following conditions:

            (a)   the representations and warranties of the Buyer contained in
      this Agreement, which representations and warranties shall be deemed for
      purposes of this Section 5.3(a) not to include any qualification or
      limitation with respect to materiality (whether by reference to a "Buyer
      Material Adverse Effect" or otherwise), shall be true and correct as of
      the Effective Time with the same effect as though such representations and
      warranties were made as of the Effective Time, except where the matters in
      respect of which such representations and warranties are not true and
      correct result from actions permitted by this Agreement or would not in
      the aggregate have a Buyer Material Adverse Effect;

            (b)   the Buyer shall have performed or complied with its material
      agreements and covenants required to be performed or complied with under
      this Agreement as of or prior to the Closing in all material respects;

            (c)   there shall not have occurred between the Agreement Date and
      the Closing Date a Buyer Material Adverse Effect;

            (d)   the Preferred Rights shall not have become nonredeemable,
      exercisable, distributed or triggered pursuant to the terms of the Rights
      Agreement; and

            (e)   the Buyer shall have delivered to the Company a certificate
      (without qualification as to knowledge or materiality or otherwise) to the
      effect that each of the conditions specified in clauses (a) through (d) of
      this Section 5.3 is satisfied in all respects.

                                       60
<PAGE>

                                   ARTICLE VI

                                   TERMINATION

            6.1   Termination of Agreement. The Parties may terminate this
Agreement prior to the Closing Date only as provided below:

            (a)   the Parties may terminate this Agreement by mutual written
      consent;

            (b)   either the Buyer or the Company may terminate this Agreement
      by giving written notice to the other in the event the other is in breach
      (i) of its representations and warranties contained in this Agreement,
      which representations and warranties shall be deemed for purposes of this
      Section 6.1(b) not to include any qualification or limitation with respect
      to materiality (whether by reference to a "Debtor Material Adverse
      Effect", "Buyer Material Adverse Effect" or otherwise), except where the
      matters in respect of which such representations and warranties are in
      breach would not in the aggregate have a Debtor Material Adverse Effect or
      a Buyer Material Adverse Effect, as the case may be, or (ii) of its
      material covenants or agreements contained in this Agreement in any
      material respect, and in either case such breach is not remedied within 20
      business days of delivery of such written notice thereof (which notice
      shall specify in reasonable detail the nature of such breach);

            (c)   (i) after March 31, 1999, the Buyer may terminate this
      Agreement by written notice to the Company if the Confirmation Order has
      not been entered by the Bankruptcy Court on or prior to such date (unless
      such failure results primarily from a breach by the Buyer of any
      representation, warranty or covenant contained in this Agreement) or (ii)
      after June 30, 1999, the Buyer may terminate this Agreement by giving
      written notice to the Company if the Closing shall not have occurred on or
      before such date (unless the failure results primarily from a breach by
      the Buyer of any representation, warranty or covenant contained in this
      Agreement);

            (d)   (i) after March 31, 1999, the Company may terminate this
      Agreement by written notice to the Buyer if the Confirmation Order has not
      been entered by the Bankruptcy Court on or prior to such date (unless the
      failure results primarily from a breach by the Company of any
      representation, warranty or covenant contained in this Agreement) or (ii)
      after June 30, 1999, the Company may terminate this Agreement by giving
      written notice to the Buyer if the Closing shall not have occurred on or
      before such date (unless the failure results primarily from a breach by
      the Company of any representation, warranty or covenant contained in this
      Agreement);

                                       61
<PAGE>

            (e)   the Company may terminate this Agreement pursuant to and in
      accordance with the provisions of Section 4.7 by giving written notice to
      the Buyer, provided that on or before such termination the Debtors shall
      have paid to the Buyer the applicable Buyer Breakup Fee;

            (f)   the Buyer may terminate this Agreement by giving written
      notice to the Company if the Initial Merger Order has not been entered by
      the Bankruptcy Court on or prior to September 4, 1998;

            (g)   The Company may terminate this Agreement by giving written
      notice to the Buyer if (i) the Buyer's Board of Directors does not issue
      the Buyer Recommendation prior to the Meeting or withdraws or amends in a
      manner adverse to the Company the Buyer Recommendation or otherwise
      materially breaches the first sentence of Section 4.12 or of Section
      4.13(a) or (ii) at the Meeting the Buyer Charter Amendment or the Buyer
      Share Issuance is not approved by the requisite vote of the holders of
      Buyer Common Stock;

            (h)   the Buyer may terminate this Agreement by giving written
      notice to the Company if the Company or any other Debtor files either an
      amendment to the Amended Plan or any other plan of reorganization in
      violation of Section 4.4(b);

            (i)   the Buyer may terminate this Agreement by giving written
      notice to the Company if (x) the Company takes any action (or omits to
      take any action) that would constitute a material breach of any of its
      material covenants or agreements contained in Section 4.1 or 4.5 but for
      the language of such Sections that permits the Company to take actions (or
      omit to take actions) required by a Bankruptcy-Related Requirement, and
      (y) such action (or omission to take action) is not remedied within 20
      business days of delivery of written notice thereof (which notice shall
      specify in reasonable detail the nature of such action (or omission to
      take action) and the nature of the resulting breach (but for such
      language)); and

            (j)   either the Buyer or the Company may terminate this Agreement
      by giving written notice to the other (i) if at the time of giving such
      notice the Debtor Tower Agreement shall have been terminated in accordance
      with its terms, unless, prior to or simultaneously with such termination,
      the Company shall have entered into a definitive agreement (which
      agreement (herein called a "Replacement Tower Agreement") shall be
      comparable in form and substance to the Debtor Tower Agreement, and any
      lease (herein called a "Comparable Tower Lease") entered into in
      connection therewith shall be comparable in form and substance to the
      Master Lease (as defined in the Debtor Tower Agreement), and a copy of
      which shall be delivered to Arch promptly following execution thereof)
      with a bona fide third-party purchaser providing for a sale to such third
      party of the assets or substantially all the assets to be sold to Pinnacle
      Towers Inc. pursuant to the Debtor Tower Agreement and which results in
      net proceeds to the Company of not less than $165,000,000 (an "Acceptable
      Sale"), or (ii) on or after December 31, 1998 if the Closing (as defined
      in the Debtor Tower

                                       62
<PAGE>

      Agreement) or the closing of an Acceptable Sale shall not have occurred on
      or before such date.

            6.2   Effect of Termination. If any Party terminates this Agreement
pursuant to Section 6.1, all obligations of the Parties hereunder shall
terminate without any liability of any Party to any other Party, except for any
liability of any Party for willful or intentional breaches of this Agreement,
and except for the Company's obligation to pay the Buyer Breakup Fee, if
applicable, and the Buyer's obligation to pay the Company Breakup Fee, if
applicable, each pursuant to Section 4.8, which shall survive any such
termination; provided that Article VIII shall also survive any such termination.
Any claims arising out of or in connection with the Company's willful or
intentional breach of any covenant or agreement herein after entry of the
Confirmation Order shall be treated as a claim for an expense of administration
under 11 U.S.C. ss. 503(b)(1) of each of Debtor's bankruptcy estate.


                                   ARTICLE VII

                                   DEFINITIONS

            For purposes of this Agreement, each of the following defined terms
is defined in the Section of this Agreement indicated below.


Defined Term                                          Section
- ------------                                          -------
Affected Employees                                    4.18(a)
Agreement                                             Introduction
Agreement Date                                        Introduction
Allowed Claims                                        Preliminary Statement
Amended Plan                                          Preliminary Statement
Attachment C Stations                                 4.15
Audited Company Financial Statements                  2.5(a)
Bankruptcy Code                                       2.1(a)
Bankruptcy Court                                      Preliminary Statement
Bankruptcy-Related Requirements                       4.5
Bear Stearns                                          3.22
Breakup Events                                        4.8(a)
Business Entity                                       2.4(a)
Buyer                                                 Introduction

                                       63
<PAGE>

Defined Term                                          Section
- ------------                                          -------
Buyer Acquisition Proposals                           4.7(d)
Buyer Affiliated Group                                3.8(a)
Buyer Affiliated Period                               3.8(a)
Buyer Authorizations                                  3.14(a)
Buyer Balance Sheet Date                              3.5(b)
Buyer Breakup Fee                                     4.8(a)
Buyer Business Entity                                 3.4(a)
Buyer Class B Common Stock                            3.1(b)
Buyer Common Stock                                    Preliminary Statement
Buyer Charter Amendment                               4.12
Buyer Disclosure Schedule                             Article III
Buyer Distribution                                    1.7(a)
Buyer Employee Benefit Plan                           3.17(a)
Buyer FCC Applications                                3.14(b)
Buyer FCC Material Adverse Effect                     5.1(e)
Buyer Intellectual Property                           3.11(a)
Buyer Licenses and Authorizations                     3.14(b)
Buyer Material Adverse Effect                         Article III
Buyer Preferred Stock                                 1.7(a)
Buyer Recommendation                                  4.12
Buyer Reimbursement                                   4.21
Buyer Reports                                         3.5(a)
Buyer Share Issuance                                  3.1(b)
Buyer State Applications                              3.14(b)
Buyer Stock                                           1.7(a)
Buyer Subsidiary                                      3.4(c)
Buyer Superior Proposal                               4.7(e)
Buyer Warrant Agreement                               Preliminary Statement
Buyer Warrants                                        Preliminary Statement
CERCLA                                                2.18(a)
Certificate of Merger                                 1.1

                                       64
<PAGE>

Defined Term                                          Section
- ------------                                          -------
Chapter 11 Proceeding                                 Preliminary Statement
Closing                                               1.2
Closing Date                                          1.2
Code                                                  Preliminary Statement
Communications Act                                    2.3
Company                                               Introduction
Company Acquisition Proposals                         4.7(a)
Company Balance Sheet Date                            2.5(a)
Company Breakup Fee                                   4.8(b)
Company Disclosure Schedule                           Article II
Company Employee Benefit Plans                        2.17(a)
Company Financial Statements                          2.5(a)
Company Group                                         2.8(b)(i)
Company Stock                                         1.5(b)
Company Superior Proposal                             4.7(b)
Company Tower Sale Proceeds                           5.2(f)
Comparable Tower Lease                                6.1(j)
Confidentiality Agreement                             4.7(c)
Confirmation Order                                    Preliminary Statement
Debtor                                                Preliminary Statement
Debtor Affiliated Group                               2.8(b)
Debtor Affiliated Period                              2.8(b)
Debtor Authorizations                                 2.14(a)
Debtor Business Entity                                2.4(a)
Debtor FCC Applications                               2.14(b)
Debtor FCC Material Adverse Effect                    5.1(e)
Debtor Licenses and Authorizations                    2.14(b)
Debtor Material Adverse Effect                        Article II
Debtor State Applications                             2.14(b)
Debtor Tower Agreement                                2.10
Debtors                                               Preliminary Statement

                                       65
<PAGE>

Defined Term                                          Section
- ------------                                          -------
Debtors' Intellectual Property                        2.11(a)
DGCL                                                  1.1
DIP Loan Agreement                                    1.11
Disclosure Statement                                  4.4(b)
Dispose                                               4.5(a)(i)
Effective Time                                        1.1
Employee Benefit Plan                                 2.17(a)
Environmental Authorization                           2.18(e)
Environmental Law                                     2.18(a)
Environmental Property Transfer Act                   2.18(f)
ERISA                                                 2.17(a)
ERISA Affiliate                                       2.17(a)
Exchange Act                                          2.3
Exchange Agent                                        1.3
Exclusivity Provisions                                4.7(a)
FCC                                                   2.3
FCC Applications                                      4.15
Filing Date                                           2.5(a)
Final Order                                           5.1(e)
Former Employees                                      4.18(b)
GAAP                                                  2.5(a)
Governmental Entity                                   2.3
Hearing                                               4.15
HSR Act                                               2.3
Indirect Buyer Authorizations                         3.14(b)
Indirect Debtor Authorizations                        2.14(b)
Initial Merger Motion                                 4.4(a)
Initial Merger Order                                  4.4(a)
Interim Monthly Financial Statements                  4.10
June 30 Unaudited Company Balance Sheet               2.5(a)
knowledge                                             8.15

                                       66
<PAGE>

Defined Term                                          Section
- ------------                                          -------
Major Breakup Event                                   4.8(a)
Materials of Environmental Concern                    2.18(b)
Meeting                                               4.12
Merger                                                1.1
Merger Subsidiary                                     Introduction
Minor Breakup Event                                   4.8(a)
Most Recent Buyer Balance Sheet                       3.5(b)
Ordinary Course of Business                           2.3
Parties                                               Introduction
Parent                                                Introduction
Pinnacle                                              2.10
Pinnacle Breakup Amount                               4.8(a)
Plan Cash                                             1.3
Plan Shares                                           1.3
Preferred Rights                                      3.2(a)
Prior Plan                                            Preliminary Statement
Proxy Statement                                       4.13(a)
Registration Rights Agreement                         Preliminary Statement
Registration Statement                                4.20(c)
Replacement Tower Agreement                           6.1(j)
Rights Agreement                                      3.2(a)
Rights Offering                                       4.20(a)
SEC                                                   2.5(a)
Securities Act                                        2.3
Security Interest                                     2.3
Standby Purchase Commitments                          Preliminary Statement
Standby Purchasers                                    Preliminary Statement
State Authority                                       2.14(a)
Surviving Corporation                                 1.1
Tax Returns                                           2.8(a)
Taxes                                                 2.8(a)

                                       67
<PAGE>

Defined Term                                          Section
- ------------                                          -------
Unaudited Quarterly Financial Statements              4.10


                                  ARTICLE VIII

                               GENERAL PROVISIONS

            8.1   Press Releases and Announcements. No Party shall issue any
press release or announcement relating to the subject matter of this Agreement
without the prior written approval of the other Parties; provided, however, that
any Party may make any public disclosure it determines in good faith, after
consultation with counsel, is required by law or regulation (in which case the
disclosing Party shall advise the other Parties and provide them with a copy of
the proposed disclosure prior to making the disclosure).

            8.2   No Third Party Beneficiaries. Except as otherwise expressly
provided herein, this Agreement shall not confer any rights or remedies upon any
person other than the Parties and their respective successors and permitted
assigns.

            8.3   Entire Agreement. This Agreement and the exhibits and
schedules attached hereto, including the Amended Plan, and the Confidentiality
Agreement constitute the entire agreement among the Parties and supersede any
prior understandings, agreements or representations by or among the Parties,
written or oral, that may have related in any way to the subject matter of the
Agreement.

            8.4   Succession and Assignment. This Agreement shall be binding
upon and inure to the benefit of the Parties named herein and their respective
successors and permitted assigns. No Party may assign either this Agreement or
any of its rights, interests or obligations hereunder without the prior written
approval of the other Parties; provided, that the Buyer may assign its rights
under this Agreement to another wholly owned subsidiary of the Buyer by notice
to the Company; provided, further, that the Buyer shall remain liable for all
its obligations hereunder.

            8.5   Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument.

            8.6   Headings. The section headings contained in this Agreement are
inserted for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

                                       68
<PAGE>

            8.7   Notices. All notices, requests, demands, claims and other
communications hereunder shall be in writing. Any notice, request, demand,
claim, or other communication hereunder shall be deemed duly delivered three
business days after it is sent by registered or certified mail, return receipt
requested, postage prepaid, or two business days after it is sent via a
reputable international overnight courier service, in each case to the intended
recipient as set forth below:


      If to the Company:                                Copy to:
      ------------------                                --------

      MobileMedia Communications, Inc.                  Sidley & Austin
      Fort Lee Executive Park                           875 Third Avenue
      One Executive Drive, Suite 500                    New York, NY  10022
      Fort Lee, NJ  07024                               Attn:  James D. Johnson
      Attn:  Chairman - Restructuring


      If to the Parent:                                 Copy to:
      -----------------                                 --------

      MobileMedia Corporation                           Sidley & Austin
      Fort Lee Executive Park                           875 Third Avenue
      One Executive Drive, Suite 500                    New York, NY  10022
      Fort Lee, NJ  07024                               Attn:  James D. Johnson
      Attn:  Chairman - Restructuring

      If to the Buyer:                                  Copy to:
      ----------------                                  --------

      Arch Communications Group, Inc.                   Hale and Dorr LLP
      1800 West Park Drive, Suite 250                   60 State Street
      Westborough, MA  01581                            Boston, MA  02109
      Attn: Chairman and Chief                          Attn:  Jay E. Bothwick
            Executive Officer

Any Party may give any notice, request, demand, claim or other communication
hereunder by personal delivery or telecopy, but no such notice, request, demand,
claim or other communication shall be deemed to have been duly given unless and
until it actually is received by the Party for whom it is intended. Any Party
may change the address to which notices, requests, demands, claims and other
communications hereunder are to be delivered by giving the other Parties notice
in the manner herein set forth.

                                       69
<PAGE>

            8.8   Governing Law. This Agreement shall be governed by and
construed in accordance with the internal laws (and not the law of conflicts) of
the State of Delaware.

            8.9   Amendments and Waivers. The Parties may mutually amend any
provision of this Agreement at any time by a written instrument signed by all of
the Parties. No waiver by any Party of any default, misrepresentation or breach
of warranty or covenant hereunder, whether intentional or not, shall be deemed
to extend to any prior or subsequent default, misrepresentation or breach of
warranty or covenant hereunder or affect in any way any rights arising by virtue
of any prior or subsequent such occurrence.

            8.10  Severability. If any court of competent jurisdiction
determines that any material provision of this Agreement is invalid or
unenforceable, then, only to the extent the Parties agree, such provision shall
be severable and null and void, and, in such event, such determination shall in
no way limit or affect the enforceability or operative effect of any or all
other portions of this Agreement.

            8.11  Expenses. Except as otherwise set forth in this Agreement,
each of the Parties shall bear its or their own costs and expenses (including
fees and expenses of their respective legal, accounting and financial advisors)
incurred in connection with this Agreement and the transactions contemplated
hereby.

            8.12  Specific Performance. Each of the Parties acknowledges and
agrees that one or more of the other Parties would be damaged irreparably in the
event any of the provisions of this Agreement are not performed in accordance
with their specific terms or otherwise are breached. Accordingly, each of the
Parties agrees that the other Parties shall be entitled to an injunction or
injunctions to prevent breaches of the provisions of this Agreement and to
enforce specifically this Agreement and the terms and provisions hereof in any
action instituted in any court having jurisdiction over the Parties and the
matter, in addition to any other remedy to which it may be entitled, at law or
in equity.

            8.13  Construction. The language used in this Agreement shall be
deemed to be the language chosen by the Parties hereto to express their mutual
intent, and no rule of strict construction shall be applied against any Party.
Any reference to any federal, state, local or foreign statute or law shall be
deemed also to refer to all rules and regulations promulgated thereunder, unless
the context requires otherwise.

            8.14  Incorporation of Exhibits and Schedules. The Exhibits and
Schedules identified in this Agreement are incorporated herein by reference and
made a part hereof.

            8.15  Knowledge. For purposes of this Agreement, the term
"knowledge" of the Company and the Buyer shall mean the actual knowledge, after
due inquiry, of the senior executive officers of the Buyer and each of its
Subsidiaries and the Parent, the Company and each other Debtor, respectively.

                                       70
<PAGE>

            8.16  Survival of Representations. None of the representations and
warranties made by the Parties herein or the documents or certificates
contemplated hereby, nor the covenants set forth in Article IV, shall survive
the Closing.

            8.17  Bankruptcy Process. Nothing contained in this Agreement shall
be deemed to limit in any manner the ability of any Debtor to take any position
before or make any motion to the Bankruptcy Court in connection with the Chapter
11 Proceeding; provided, however, that no Debtor shall take any such position or
make any such motion in support of any action or inaction by such Debtor that
would constitute a breach of any covenant of the Company contained in this
Agreement.

                                       71
<PAGE>

            IN WITNESS WHEREOF, the Parties have executed this Agreement and
Plan of Merger as of the date first above written.

                                        ARCH COMMUNICATIONS GROUP, INC.         
                                        
                                        
                                        By:
                                           ----------------------------
                                           Name:
                                           Title:
                                        
                                        
                                        
                                        FARM TEAM CORP.
                                        
                                        
                                        By:
                                           ----------------------------
                                           Name:
                                           Title:
                                        
                                        
                                        
                                        SUBJECT TO ENTRY OF THE PROVISION 
                                        ORDER AS TO THE PROVISIONS HEREOF 
                                        COVERED THEREBY AND TO THE RECEIPT 
                                        OF THE CONFIRMATION ORDER FROM THE
                                        BANKRUPTCY COURT WITH RESPECT TO THE 
                                        AMENDED PLAN AS DESCRIBED HEREIN:
                                        
                                        MOBILEMEDIA CORPORATION
                                        
                                        
                                        By:
                                           ----------------------------
                                           Name:
                                           Title:
                                        
                                        
                                        MOBILEMEDIA COMMUNICATIONS, INC.
                                        
                                        
                                        By:
                                           ----------------------------
                                           Name:
                                           Title:

                                       72
<PAGE>

                                                                       Exhibit A

                      IN THE UNITED STATES BANKRUPTCY COURT
                          FOR THE DISTRICT OF DELAWARE


In re:                                 )          Chapter 11
                                       )
MobileMedia Communications,            )          Case No. 97-174 (PJW)
Inc., et al.,                          )
                                       )          (Jointly Administered)
                           Debtors     )


               DEBTORS' FIRST AMENDED JOINT PLAN OF REORGANIZATION

                             Dated: August 18, 1998

J. Ronald Trost
James D. Johnson
Shelley C. Chapman
Lee M. Stein
SIDLEY & AUSTIN
875 Third Avenue
New York, New York  10022
(212) 906-2000

James L. Patton, Jr. (No. 2202)
Joel A. Waite (No. 2925)
YOUNG CONAWAY STARGATT &
TAYLOR, LLP
P.O. Box 391
Wilmington, Delaware  19899
(302) 571-6600


Co-Counsel to Debtors and
Debtors-in-Possession
<PAGE>

            MobileMedia Corporation, a Delaware corporation ("MobileMedia"),
MobileMedia Communications, Inc., a Delaware corporation ("Communications"),
MobileMedia Communications, Inc. (California), a California corporation,
MobileMedia DP Properties, Inc., a Delaware corporation, MobileMedia PCS, Inc.,
a Delaware corporation, Dial Page Southeast, Inc., a Delaware corporation, Radio
Call Company of Va., Inc., a Virginia corporation, MobileMedia Paging, Inc., a
Delaware corporation, Mobile Communications Corporation of America, a
Mississippi corporation, MobileComm of the Southeast, Inc., a Delaware
corporation, MobileComm of the Northeast, Inc., a Delaware corporation,
MobileComm Nationwide Operations, Inc., a Delaware corporation, MobileComm of
Tennessee, Inc., a Tennessee corporation, MobileComm of the Southeast Private
Carrier Operations, Inc., a Georgia corporation, MobileComm of the Southwest,
Inc., a Texas corporation, MobileComm of Florida, Inc., a Florida corporation,
MobileComm of the Midsouth, Inc., a Missouri corporation, FWS Radio, Inc., a
Texas corporation, and MobileComm of the West, Inc., a California corporation,
each a debtor and debtor-in-possession herein (collectively, the "Debtors"),
propose the following First Amended Joint Plan of Reorganization (the "Plan").


                                  INTRODUCTION
                                  ------------

            This Plan encompasses a reorganization of the Debtors pursuant to
which Communications will merge with and into Farm Team Corp., a Delaware
corporation ("Merger Subsidiary") and a subsidiary of Arch Communications Group,
Inc. ("Arch"), with Merger Subsidiary being the surviving company. The Debtors'
creditors will receive cash or equity securities of Arch. There will be no
recovery for the Debtors' equity security holders.

            Reference is made to the Disclosure Statement accompanying this
Plan, including the exhibits thereto, for a discussion of the Debtors' and
Arch's history, business, results of operations and properties, and for a
summary and analysis of this Plan. All creditors are encouraged to consult the
Disclosure Statement and to read this Plan carefully before voting to accept or
reject this Plan.

            NO SOLICITATION MATERIALS, OTHER THAN THE DISCLOSURE STATEMENT AND
RELATED MATERIALS TRANSMITTED THEREWITH AND APPROVED BY THE BANKRUPTCY COURT,
HAVE BEEN AUTHORIZED BY THE BANKRUPTCY COURT FOR USE IN SOLICITING ACCEPTANCES
OR REJECTIONS OF THIS PLAN.


                                    ARTICLE I
                           DEFINITIONS; INTERPRETATION
                           ---------------------------

            1.1   Definitions.

            In addition to such other terms as are defined in other Sections of
this Plan, the following terms (which appear in this Plan as capitalized terms)
shall have the meanings set forth
<PAGE>

below. A term used in this Plan and not defined in this Plan but that is defined
in the Code has the meaning set forth in the Code.

            "9-3/8% Note Indenture" means the Indenture dated as of November 13,
1995, between Communications, as Issuer, and State Street Bank and Trust
Company, as Trustee.

            "9-3/8% Notes" means the Senior Subordinated Notes due November 1,
2007, issued pursuant to the 93/8% Note Indenture.

            "10-1/2% Note Indenture" means the Indenture dated as of December 1,
1993, between Communications, as Issuer, and First Trust USA (as successor to
BankAmerica National Trust Company), as Trustee, as amended.

            "10-1/2% Notes" means the 10 1/2% Senior Subordinated Deferred
Coupon Notes due December 1, 2003, issued pursuant to the 10 1/2% Note
Indenture.

            "1995 Credit Agreement" means the Credit Agreement dated as of
December 4, 1995, as amended, among Communications, the Pre-Petition Lenders and
the Pre-Petition Agent.

            "Administrative Claim" means a Claim to the extent that it is of the
kind described in section 503(b) of the Code and is entitled to priority under
section 507(a)(1) of the Code.

            "Allowed" means as to any Claim (whether an Administrative Claim,
Priority Claim, Priority Tax Claim, Secured Claim or Unsecured Claim), the
extent to which such Claim:

                  (a)   (i)   was timely filed or listed in the Schedules and
                              not listed as disputed, contingent or unliquidated
                              as to amount; and

                        (ii)  the Debtors, the Reorganized Debtors or any other
                              party in interest entitled to do so has not and
                              does not file an objection to such Claim within
                              the time period set forth for objecting in Section
                              4.4;

                  (b)   is allowed by a Final Order of the Bankruptcy Court; or

                  (c)   is allowed by this Plan.

            "Arch Capital Shares" means, collectively, the Arch Common Shares
and the Arch Class B Common Shares.

            "Arch Class B Common Shares" means the shares of Class B Common
Stock of Arch, par value $0.01 per share, to be authorized and issued as and
when contemplated by the Merger Agreement.

                                      -2-
<PAGE>

            "Arch Common Shares" means the shares of Common Stock of Arch, par
value $0.01 per share, which are issued and outstanding plus additional shares
which will be authorized and issued as and when contemplated by the Merger
Agreement.

            "Arch Series C Convertible Preferred Shares" means the shares of
Series C Convertible Preferred Stock of Arch, par value $0.01 per share.

            "Arch Warrants" means warrants for the purchase of Arch Common
Shares, certain of which Warrants will be part of the Units to be subscribed for
in the Rights Offering, and all of which Warrants will be issued pursuant to a
Warrant Agreement governing their issuance and exercise that will be in the form
set forth in Exhibit B to the Merger Agreement.

            "Ballot" means the ballot for voting to accept or reject this Plan
distributed by the Debtors to all holders of impaired Claims entitled to vote on
this Plan.

            "Bankruptcy Court" means the United States Bankruptcy Court for the
District of Delaware in which the Cases were filed on January 30, 1997, or any
other court with jurisdiction over the Cases.

            "Bankruptcy Rules" means the Federal Rules of Bankruptcy Procedure,
as amended from time to time to the extent applicable to the Cases.

            "Benefit Plan Indemnification Obligations" means Indemnification
Obligations with respect to any officer or employee serving as a fiduciary of
any employee benefit plan or program of the Debtors, pursuant to charter, by
law, contract or applicable state law for any actions taken or not taken in the
discharge of such officer's or employee's duties as a fiduciary of such employee
benefit plans or programs.

            "Business Day" means any day other than a Saturday, Sunday or day on
which commercial banks in the city of New York, New York or the States of New
Jersey or Delaware are authorized or required to close.

            "Capped Administrative Claims" means the Debtors' good faith
estimate of the sum of (i) Priority Tax Claims, (ii) Administrative Claims for
(x) bonuses payable to employees and professionals on or as a result of the
Effective Date, (y) amounts necessary to cure any defaults in executory
contracts or unexpired leases assumed pursuant to this Plan as required by
section 365(b) of the Code and (z) any accrued and unpaid fees and expenses of
professionals retained by the Debtors or the Committee pursuant to orders of the
Bankruptcy Court, and (iii) Claims for (x) the Allowed Class 4 Claims described
in Section 2.6(B)(ii), (iii) and (iv), (y) the Allowed Class 5 Claims described
in Section 2.7(B), and (z) Allowed Class 6 Claims of the indenture trustees
under the Subordinated Indentures described in Section 2.8(C)(3), in each case
(other than those Claims in clause (iii)(z) hereof which shall be payable until
such professionals no longer provide services to their respective constituencies
on account of the Cases), accrued and unpaid or payable as of the Effective
Date, which estimate shall be in reasonable detail (which in the case of
professional fees, shall be in substantially the same form as would be 

                                      -3-
<PAGE>

submitted to the Bankruptcy Court) and shall be delivered to Arch (with a copy
to the Committee) twenty days prior to the Effective Date. If no objection is
made by Arch to the Debtors' estimate within ten days after receipt thereof, the
estimate shall be deemed to be the amount of Capped Administrative Claims for
purposes of Section 2.1(D). If Arch delivers to the Debtors (with a copy to the
Committee) a written objection to the Debtors' estimate within ten days after
receipt of such estimate, and the Debtors and Arch are unable to resolve such
objection, it shall be submitted to the Bankruptcy Court to be determined on or
as soon as practicable after the Effective Date.

            "Cash Equivalent" means, with respect to any Right, an amount equal
to the value of such Right as determined based on the actual proceeds received
from the sale of Rights from the Rights Reserve pursuant to Section 4.1(B)(5)
(or, if the Rights Reserve is then fully depleted, the fair value thereof as of
the time such sale would have occurred based on the market price for such Right
or, if no such price is available, as determined by the Debtors, Arch and the
Committee in good faith or determined by the Bankruptcy Court if no agreement
can be reached).

            "Cases" means the reorganization proceedings of the Debtors under
chapter 11 of the Code, jointly administered as Case No. 97-174 (PJW).

            "Causes of Action" means all claims and causes of action now owned
or hereafter acquired by the Debtors, whether arising under any contract or
under the Code or other federal or state law, including, without limitation, any
causes of action arising under sections 544, 545, 547, 548, 549, 550, 551,
553(b) or other sections of the Code.

            "Claim" means "claim" as defined in section 101(5) of the Code, as
supplemented by section 102(2) of the Code, and shall, in each case, mean a
Claim against any Debtor (whether or not so designated).

            "Class" means each class of Claims or Claims and Interests created
under this Plan.

            "Class 6 Adjusted Pro Rata Share" means, as to any Allowed Class 6
Claim, as of the date that is five Business Days prior to the Final Distribution
Date, a fraction (i) the numerator of which is the amount of such Allowed Class
6 Claim and (ii) the denominator of which is the aggregate amount of all Allowed
Class 6 Claims as of such date.

            "Class 6 Pro Rata Share" means, as to any Allowed Claim in Class 6
on the Effective Date or such later date (prior to the Final Distribution Date)
as such Claim becomes Allowed, a fraction (i) the numerator of which is the
amount of such Allowed Claim and (ii) the denominator of which is the sum of (x)
the Effective Date Disputed Claims, (y) the Effective Date Allowed Claims and
(z) an estimate of the aggregate amount of Claims arising from the rejection of
executory contracts and unexpired leases pursuant to Section 3.1 that are
anticipated to become Allowed Claims, such estimate to be mutually agreed upon
by the Debtors, the Committee and Arch in good faith or determined by the
Bankruptcy Court if no such agreement can be reached.

                                      -4-
<PAGE>

            "Code" means the United States Bankruptcy Code, 11 U.S.C. ss.ss. 101
et seq., as amended from time to time to the extent applicable to the Cases.

            "Committee" means the Official Committee of Unsecured Creditors
appointed by the United States Trustee for the District of Delaware on February
10, 1997.

            "Common Stock" means, collectively, (i) the Class A common stock of
MobileMedia, par value $.001, issued and outstanding immediately prior to the
Effective Date, (ii) the Class B common stock of MobileMedia, par value $.001,
issued and outstanding immediately prior to the Effective Date and (iii) all
options, warrants and other rights to purchase the Class A common stock or the
Class B common stock of MobileMedia.

            "Common Stock Claim" means any Claim with respect to the Common
Stock of the kind described in section 510(b) of the Code, including, without
limitation, any such Claim asserted in or by the parties to the Securities
Actions and any Claim by an officer, director or underwriter for contribution,
reimbursement or indemnification related thereto.

            "Confirmation" means "confirmation" as used in section 1129 of the
Code.

            "Confirmation Date" means the date on which the Confirmation Order
is entered by the Bankruptcy Court.

            "Confirmation Hearing" means the hearing at which the Bankruptcy
Court considers Confirmation of this Plan.

            "Confirmation Order" means an order of the Bankruptcy Court
confirming this Plan, which order shall be reasonably satisfactory to Arch and,
as to the provisions relating to the treatment of Allowed Class 4 Claims, the
Pre-Petition Agent.

            "Creditor" means "creditor" as defined in section 101(10) of the
Code and shall mean a creditor of any Debtor.

            "Creditor Stock Pool" means a number of newly-issued Arch Common
Shares equal to approximately [16.9%-31.0%](1) of the issued and outstanding
Arch Capital Shares, on the date the "Buyer Market Price" is determined in
accordance with Schedule II to the Merger Agreement, computed on a Diluted Basis
and after giving effect to the Plan as if the Effective Date had occurred on
such date and assuming 21,067,110 Arch Common Shares are issued and outstanding
immediately prior thereto, as such number of shares constituting the Creditor
Stock Pool may be adjusted pursuant to Section 2.1(D).

- --------

(1) Such percentage will be fixed prior to soliciting votes on this Plan based
on the pricing mechanism set forth in Schedule II to the Merger Agreement.

                                      -5-
<PAGE>

            "Customer Refund Claim" means a Claim by a customer or subscriber of
any of the Debtors for refund of amounts improperly paid or billed, or for the
return of a deposit.

            "Dial Page Indenture" means the Indenture dated as of February 1,
1993, between Dial Page, Inc., a Delaware corporation, as Issuer, and the Dial
Page Indenture Trustee, as amended.

            "Dial Page Indenture Trustee" means Norwest Bank Minnesota, N.A. (as
successor to First Union Bank of South Carolina), as Trustee under the Dial Page
Indenture.

            "Dial Page Notes" means the 12 1/4% Senior Notes due 2000, issued
pursuant to the Dial Page Indenture.

            "Diluted Basis" means after giving effect to (i) the issuance and
distribution pursuant to this Plan of the Arch Capital Shares (including the
Arch Capital Shares issued upon exercise of the Rights issued pursuant to the
Rights Offering but excluding Arch Capital Shares issued or issuable upon
exercise of the Arch Warrants) and (ii) the assumed issuance of all Arch Common
Shares issuable upon conversion of all convertible preferred stock (including
the Arch Series C Convertible Preferred Shares) and convertible debt securities
of Arch outstanding as of the date the "Buyer Market Price" is determined in
accordance with Schedule II to the Merger Agreement.

            "DIP Agent" means The Chase Manhattan Bank, in its capacity as agent
for the DIP Lenders under the DIP Credit Agreement.

            "DIP Approval Orders" means, collectively, (i) the Final Order (I)
Authorizing (A) Secured Post-Petition Financing On A Super Priority Basis
Pursuant To 11 U.S.C. ss. 364, (B) Use Of Cash Collateral Pursuant to 11 U.S.C.
ss. 363 and (C) Grant of Adequate Protection Pursuant To 11 U.S.C. ss.ss. 363
And 364, dated February 19, 1997, (ii) Order (I) Authorizing Extension of (A)
Secured Post-Petition Financing On A Super Priority Basis Pursuant To 11 U.S.C.
ss. 364, (B) Use Of Cash Collateral Pursuant To 11 U.S.C. ss. 363 And (C) Grant
Of Adequate Protection Pursuant To 11 U.S.C. ss.ss. 363 And 364 And (II)
Scheduling A Final Hearing Pursuant To Bankruptcy Rule 4001(c), dated January
27, 1998 and (iii) Order (I) Authorizing Extension of (A) Secured Post-Petition
Financing On A Super Priority Basis Pursuant To 11 U.S.C. ss. 364, (B) Use Of
Cash Collateral Pursuant To 11 U.S.C. ss. 363 And (C) Grant Of Adequate
Protection Pursuant To 11 U.S.C. ss.ss. 363 And 364 And (II) Scheduling A Final
Hearing Pursuant To Bankruptcy Rule 4001(c), dated July 28, 1998.

            "DIP Credit Agreement" means the Revolving Credit and Guarantee
Agreement dated as of January 30, 1997, as amended, among Communications, as
Borrower, MobileMedia, as Parent and Guarantor, each of the direct and indirect
subsidiaries of Communications designated as Guarantor in Schedule 3.5 thereto,
as Guarantors, the DIP Agent and the DIP Lenders.

                                      -6-
<PAGE>

            "DIP Lenders" means those financial institutions from time to time
party to the DIP Credit Agreement as lenders.

            "Director Indemnification Obligations" means Indemnification
Obligations with respect to any present or former director of any of the
Debtors.

            "Disclosure Statement" means the Disclosure Statement respecting
this Plan approved by order of the Bankruptcy Court, and all supplements and
exhibits thereto.

            "Disputed Claim" means a Claim against any of the Debtors to the
extent that such Claim is not Allowed.

            "Effective Date" means the date on which this Plan becomes effective
which date shall be ten Business Days after all the conditions to the Effective
Date set forth in Section 5.1 have first been satisfied or waived, or such
earlier date (but not less than seven Business Days after such conditions have
first been satisfied or waived) as the Debtors, Arch, the Pre-Petition Agent,
the DIP Agent and the Committee shall agree.

            "Effective Date Allowed Claims" means those Class 6 Claims that have
been Allowed by order of the Bankruptcy Court prior to the Effective Date or
that are Allowed pursuant to this Plan, as set forth in a schedule delivered by
the Debtors to the Exchange Agent and Arch two Business Days prior to the
Effective Date, which schedule, absent manifest error, shall be conclusive for
the purposes of calculating Class 6 Pro Rata Share and Class 6 Adjusted Pro Rata
Share.

            "Effective Date Disputed Claims" means, on and as of the Effective
Date, any Class 6 Claim that is a Disputed Claim on and as of such date, in the
full amount set forth in any timely filed proof of claim or listed by the
Debtors in the Schedules, as set forth in a schedule delivered by the Debtors to
the Exchange Agent and Arch two Business Days prior to the Effective Date, which
schedule, absent manifest error, shall be conclusive for purposes of calculating
Class 6 Pro Rata Share and Class 6 Adjusted Pro Rata Share.

            "Estate Representative" has the meaning given such term in Section
4.2(C)(5).

            "Exchange Agent" means a bank trust company or other entity
reasonably satisfactory to MobileMedia and the Committee, appointed by Arch to
act as the exchange agent for making distributions to the holders of Allowed
Class 6 Claims.

            "Excluded Indemnification Obligations" means Indemnification
Obligations with respect to (i) any present or former officer of the Debtors
considered as of the Effective Date by the FCC to be an alleged wrongdoer for
purposes of the FCC Proceeding, (ii) any present or former officer of the
Debtors now or hereafter named as a defendant in the Securities Actions, as to
claims arising out of the matters alleged in the Securities Actions, (iii) any
present or former officer of the Debtors named as a defendant in any action
initiated after the date hereof based upon similar factual allegations, or
alleging similar causes of action, to the Securities Actions, as

                                      -7-
<PAGE>

to claims arising out of the matters alleged therein, (iv) any officer or
employee of the Debtors that is not an officer or employee as of the Effective
Date, (v) present or former professionals or advisors of the Debtors, including,
without limitation, accountants, auditors, financial consultants, underwriters
or attorneys, other than Indemnification Obligations arising out of
post-petition agreements approved by the Bankruptcy Court, and (vi) any
Indemnification Obligation of the kind described in section 510(b) of the Code.

            "FCC" means the Federal Communications Commission or any
governmental authority succeeding to the rights and powers thereof.

            "FCC Proceeding" means the hearing in WT Docket No. 97-115, In the
Matter of MobileMedia Corporation, et al.

            "Final Distribution Date" means the tenth Business Day after the day
on which no Class 6 Claim remains a Disputed Claim.

            "Final Order" means, as to any court, administrative agency or other
tribunal, an order or judgment of such tribunal as entered on its docket as to
which the time to appeal or petition for certiorari has expired and as to which
no appeal or petition for certiorari is pending or, if an appeal or petition for
certiorari has been timely filed or taken, the order or judgment of the tribunal
has been affirmed (or such appeal or petition has been dismissed as moot) by the
highest court (or other tribunal having appellate jurisdiction over the order or
judgment) to which the order was appealed or the petition for certiorari has
been denied, and the time to take any further appeal or to seek further
certiorari has expired.

            "Fully Diluted Basis" means after giving effect to (i) the issuance
and distribution pursuant to this Plan of the Arch Capital Shares (including the
Arch Capital Shares issued upon exercise of the Rights issued pursuant to the
Rights Offering), (ii) the assumed issuance of all Arch Common Shares issuable
upon conversion of all convertible preferred stock (including the Arch Series C
Convertible Preferred Shares) and convertible debt securities of Arch
outstanding as of the date the "Buyer Market Price" is determined in accordance
with Schedule II to the Merger Agreement, and (iii) the assumed issuance of all
Arch Common Shares issuable upon the exercise of the Arch Warrants.

            "Indemnification Obligations" means the obligation of any of the
Debtors to indemnify, reimburse or provide contribution to any present or former
officer, director or employee, or any present or former professionals or
advisors of the Debtors, including, without limitation, accountants, auditors,
financial consultants, underwriters or attorneys, whether pursuant to charter,
by law, contract or statute, regardless of whether the indemnification is owed
in connection with a pre-Petition Date or post-Petition occurrence.

            "Interest" means all rights (including unpaid dividends) arising
from any equity security (as defined in section 101(16) of the Code) of the
Debtors, including, without limitation, the Common Stock, but excluding Common
Stock Claims.

                                      -8-
<PAGE>

            "License Co. L.L.C." means the limited liability company to be
formed as a wholly owned subsidiary of MCCA as reorganized pursuant to this Plan
that will hold the Reorganized Debtors' Licenses after the Effective Date.

            "Licenses" means the licenses and other authorizations of the
Debtors to operate their paging networks.

            "Lien" means, with respect to any interest in property, any
mortgage, lien, pledge, charge, security interest, easement or encumbrance of
any kind whatsoever affecting such interest in property.

            "Merger" means the merger of Communications into Merger Subsidiary
contemplated by the Merger Agreement and Section 4.2(B).

            "Merger Agreement" means the Agreement and Plan of Merger by and
among Arch, the Merger Subsidiary, MobileMedia and Communications dated as of
August 18, 1998.

            "MCCA" means Mobile Communications Corporation of America, a
Mississippi corporation.

            "Miscellaneous Secured Claim" means a Secured Claim not classified
in Class 4 under this Plan.

            "Net Tower Sale Proceeds" shall be the Net Cash Proceeds (as defined
in the DIP Credit Agreement) from the Debtors' sale of their towers and certain
related assets, as set forth in the Tower Sale Agreement, which Net Cash
Proceeds shall be at least $165 million.

            "Non-Priority Unsecured Claim" means any Unsecured Claim not
classified in Class 3, 5, 7, 8 or 9 under this Plan.

            "Note Litigation Claim" means any Claim with respect to the Notes of
the kind described in section 510(b) of the Code, including, without limitation,
any such Claim asserted in or by the parties to the Securities Actions and any
Claim by an officer, director or underwriter for contribution, reimbursement or
indemnification related thereto.

            "Notes" means, collectively, the Dial Page Notes, the 93/8% Notes
and the 10-1/2% Notes.

            "Person" means any person, including, without limitation, any
individual, partnership, joint venture, corporation, company, trust, estate,
unincorporated organization and any governmental unit.

            "Personal Injury Claim" means a Claim against any of the Debtors
that is unliquidated or contingent as of the Confirmation Date and is of the
kind described in 28 U.S.C. ss. 157(b)(5).

                                      -9-
<PAGE>

            "Petition Date" means January 30, 1997, the date on which the
petitions initiating the Cases were filed with the Bankruptcy Court.

            "Plan" means this First Amended Joint Plan of Reorganization, as
amended from time to time, and all addenda, exhibits, schedules and other
attachments hereto, as the same may be amended from time to time, pursuant to
this Plan or the Code, all of which are incorporated herein by reference.

            "Pre-Petition Agent" means The Chase Manhattan Bank, in its capacity
as the agent for the Pre-Petition Lenders under the 1995 Credit Agreement.

            "Pre-Petition Lenders" means those financial institutions from time
to time party to the 1995 Credit Agreement as lenders.

            "Priority Claim" means a Claim to the extent that it is of the kind
described in, and entitled to priority under, section 507(a)(3), (a)(4) or
(a)(6) of the Code.

            "Priority Tax Claim" means a Claim to the extent that it is of the
kind described in, and entitled to priority under, section 507(a)(8) of the
Code.

            "Pro Rata Share" means proportionately, so that with respect to an
Allowed Claim other than an Allowed Class 6 Claim, the ratio of (i) the amount
of payments or other property distributable on account of a particular Allowed
Claim in a particular Class under this Plan to (ii) the amount of such Allowed
Claim in such Class is the same as the ratio of (a) the amount of payments or
other property distributable on account of all Allowed Claims in such Class to
(b) the amount of all Allowed Claims in such Class.

            "Registration Rights Agreement" means a registration rights
agreement to be entered into pursuant to Section 4.9 between Arch and any Person
entitled to become a party to such registration rights agreement under Section
4.9, which shall be in substantially the form attached as Exhibit A.

            "Reorganized Communications" means, on and after the Effective Date,
Merger Subsidiary, the successor to Communications (as reorganized under and
pursuant to this Plan) and a wholly owned subsidiary of Arch as a result of the
Merger.

            "Reorganized Debtors" means, on and after the Effective Date,
Reorganized Communications and Reorganized MCCA.

            "Reorganized Debtor's Certificate of Incorporation" means, (i) as to
Reorganized Communications, the Certificate of Incorporation of Merger
Subsidiary, as amended by the Certificate of Merger relating to the Merger and
except that the name of the corporation set forth therein shall be changed to
"MobileMedia Communications, Inc.", and (ii) as to Reorganized MCCA, the
Certificate of Incorporation of Delaware Subsidiary Co.

                                      -10-
<PAGE>

            "Reorganized Debtor's Bylaws" means, as to Reorganized
Communications, the Bylaws of Merger Subsidiary, and as to Reorganized MCCA, the
Bylaws of Delaware Subsidiary Co.

            "Reorganized MCCA" means Delaware Subsidiary Co., the successor to
MCCA (as reorganized under and pursuant to this Plan) and a wholly owned
subsidiary of Reorganized Communications.

            "Rights" means certificated, transferable rights issued by Arch for
the purchase of (i) an aggregate number of Arch Capital Shares equal to
approximately [34.5%-52.4%](2) of the issued and outstanding Arch Capital
Shares, on the date the "Buyer Market Price" is determined in accordance with
Schedule II to the Merger Agreement, computed on a Diluted Basis after giving
effect to the Plan as if the Effective Date had occurred on such date and
assuming 21,067,110 Arch Common Shares are issued and outstanding immediately
prior thereto (such number of Arch Capital Shares being herein called the
"Rights Shares"), and (ii) Arch Warrants entitling the holders thereof to
purchase, in the aggregate, a number of Arch Common Shares equal to 2.50% of the
issued and outstanding Arch Capital Shares, computed on a Fully Diluted Basis on
the date the "Buyer Market Price" is determined in accordance with Schedule II
to the Merger Agreement, computed on a Fully Diluted Basis after giving effect
to the Plan as if the Effective Date had occurred on such date and assuming
21,067,110 Arch Common Shares are issued and outstanding immediately prior
thereto, which Rights shall be issued to certain holders of Allowed Class 6
Claims pursuant to the Rights Offering, and which Rights shall have the terms
set forth in Schedule III to the Merger Agreement. Each Right will be
exercisable for one Unit.

            "Rights Offering" means the issuance of the Rights by Arch to
holders of Allowed Class 6 Claims on the Rights Offering Commencement Date.

            "Rights Offering Commencement Date" means the date on which Arch
commences the Rights Offering by mailing to holders of Allowed Class 6 Claims as
of the Rights Offering Initial Record Date certificates representing the Rights
and instructions for the exercise thereof, which date shall be as soon as
practicable after the later to occur of (i) approval by the Bankruptcy Court of
the Disclosure Statement and (ii) the effectiveness of the Registration
Statement (as defined in the Merger Agreement).

            "Rights Offering Distribution Pool" means all of the Rights minus
the Rights included in the Rights Reserve.

            "Rights Offering Expiration Date" means 5:00 p.m., New York City
time, on the date on which the Rights Offering terminates, which date shall be
established by Arch and Communications, on or prior to the Confirmation Date,
but shall be not less than 15 calendar 
- --------

(2) Such percentage will be fixed prior to soliciting votes on this Plan based
on the pricing mechanism set forth in Schedule II to the Merger Agreement.

                                      -11-
<PAGE>

days after the date on which all the conditions to effectiveness of this Plan
shall have been satisfied or waived (other than (i) the requirement that the
order entered by the FCC has become a Final Order in connection with the
condition set forth in Section 5.1(e) of the Merger Agreement, and (ii) such
conditions that by their nature are to be satisfied on the Effective Date).

            "Rights Offering Initial Record Date" means the date that is the
record date to determine which holders of Claims are entitled to vote on this
Plan.

            "Rights Offering Pro Rata Share" means, as to any Allowed Class 6
Claim, a fraction, (i) the numerator of which is the amount of such Allowed
Class 6 Claim as of the date of determination and (ii) the denominator of which
is the aggregate amount of Allowed Class 6 Claims as of the Rights Offering
Initial Record Date.

            "Rights Offering Supplemental Record Date" means the Confirmation
Date.

            "Rights Reserve" means, as of the Rights Offering Initial Record
Date, a number of Rights equal to the product of (i) the total number of Rights,
and (ii) a fraction, (A) the numerator of which is the sum of the estimated
aggregate amount of (x) Class 6 Claims that are Disputed Claims and (y) Claims
arising from the rejection of executory contracts and unexpired leases pursuant
to Section 3.1 that are anticipated to become Allowed Claims, such estimate to
be mutually agreed upon by the Debtors, the Committee and Arch, in good faith,
or determined by the Bankruptcy Court if no such agreement can be reached, and
(B) the denominator of which is the sum of the estimated aggregate amount of (x)
Class 6 Claims that are Disputed Claims, (y) Claims arising from the rejection
of executory contracts and unexpired leases pursuant to Section 3.1 that are
anticipated to become Allowed Claims, such estimate to be mutually agreed upon
by the Debtors, the Committee and Arch, in good faith, or determined by the
Bankruptcy Court if no such agreement can be reached, and (z) all Allowed Class
6 Claims as of such date.

            "Rights Shares" has the meaning included in the definition of
Rights.

            "Schedules" means the joint Schedules of Assets, Liabilities and
Executory Contracts filed by the Debtors with the Clerk of the Bankruptcy Court
for the District of Delaware pursuant to Bankruptcy Rule 1007, as such schedules
have been or may be amended or supplemented by the Debtors from time to time.

            "Secured Claim" means a Claim that is secured by a Lien on, or
interest in, property of any of the Debtors, or that is subject to setoff under
section 553 of the Code, but only to the extent of the value of the Creditor's
interest (directly or by enforceable subrogation) in the Debtor's interest in
such property, or to the extent of the amount subject to setoff, which value
shall be determined as provided in section 506(a) of the Code or as provided in
this Plan.

            "Securities Actions" means, collectively, the actions styled In re
MobileMedia Securities Litigation, No. 96-5723 (AJL) (D. N.J. 1996), Allen T.
Gilliland Trust v. Hellman & Friedman Capital Partners II, L.P., et al., Civil
Action No. 97-3543 (N.D. Cal. 1997) and Allen T. 

                                      -12-
<PAGE>

Gilliland Trust v. Hellman & Friedman MobileMedia Partners, L.L.C., et al., Case
No. 989891 (Cal. Super. Ct. 1997).

            "Semi-Annual Distribution Date" means the last Business Day of each
June and December after the Effective Date and prior to the Final Distribution
Date; provided, that if the Effective Date is within 60 days before the end of
June or December, the first Semi-Annual Distribution Date will be the last
Business Day of the next succeeding June (if the Effective Date is in December)
or December (if the Effective Date is in June).

            "Standby Purchase Commitment" means the various commitments of the
Standby Purchasers to purchase Units in the event any Rights are not exercised
in the Rights Offering, as evidenced by the letters attached hereto as Exhibits
B-1 through B-6.

            "Standby Purchasers" means those creditors of the Debtors that have
executed a Standby Purchase Commitment.

            "Subordinated Indemnification Obligation Claims" means
Indemnification Obligations that are rejected pursuant to Section 7.5(A) and any
Claims arising therefrom.

            "Subordinated Indentures" means, collectively, the 93/8% Note
Indenture and the 10 1/2% Note Indenture.

            "Subordinated Noteholder Claims" means all Claims arising under or
relating to the Subordinated Notes, the Subordinated Indentures and related
agreements, other than Note Litigation Claims.

            "Subordinated Notes" means, collectively, the 93/8% Notes and the 10
1/2% Notes.

            "Subsidiary Claim" means any Claim by a Debtor against another
Debtor.

            "Subsidiary Interest" means any Interest held by a Debtor in another
Debtor, including all options, warrants and other rights to purchase any such
Interest in a Debtor held by another Debtor.

            "Tower Sale Agreement" means the Purchase Agreement between the
Debtors and Pinnacle Towers Inc. dated July 7, 1998, as approved by the
Bankruptcy Court on August 10, 1998, or as amended in accordance therewith and
in accordance with the order of the Bankruptcy Court.

            "Unit" means (i) one Arch Capital Share and (ii) 0. of an Arch
Warrant.(3)

- --------

(3) The fraction of an Arch Warrant that will be included in each Unit will
equal the fraction obtained by dividing (i) the total number of Arch Warrants
purchasable upon exercise of Rights 
                                                                  (continued...)

                                      -13-
<PAGE>

            "Unsecured Claim" means a Claim that is not an Administrative Claim,
a Priority Claim, a Priority Tax Claim or a Secured Claim.

            "Voting Deadline" means that date set in an order of the Bankruptcy
Court as the deadline for the return of Ballots accepting or rejecting this
Plan.

            1.2   Interpretation. For purposes of this Plan: (a) whenever from
the context it is appropriate, each term, whether stated in the singular or the
plural, will include both the singular and the plural; (b) unless otherwise
provided in this Plan, any reference in this Plan to a contract, instrument,
release, indenture or other agreement or document being in a particular form or
on particular terms and conditions means that such document will be
substantially in such form or substantially on such terms and conditions; (c)
unless otherwise provided in this Plan, any reference in this Plan to an
existing document or Exhibit means such document or Exhibit, as it may have been
or may be amended, modified or supplemented pursuant to this Plan; (d) unless
otherwise specified herein, any reference to an entity as a holder of a Claim
includes that entity's successors, assigns and affiliates; (e) unless otherwise
specified, all references in this Plan to Sections, Articles and Exhibits are
references to Sections, Articles and Exhibits of or to this Plan; (f) the words
"herein" and "hereto" refer to this Plan in its entirety rather than to a
particular portion of this Plan; (g) captions and headings to Articles and
Sections are inserted for convenience of reference only and are not intended to
be part of or to affect the interpretation of this Plan; and (h) the rules of
construction set forth in section 102 of the Code will apply.

            1.3   Computation of Time. In computing any period of time
prescribed or allowed by this Plan, the provisions of Bankruptcy Rule 9006(a)
will apply.


                                   ARTICLE II
              CLASSIFICATION AND TREATMENT OF CLAIMS AND INTERESTS
              ----------------------------------------------------

            The following is a designation of the Classes of Claims and
Interests classified under this Plan, and the treatment to be provided to each
such Class.

            A Claim or Interest shall be deemed classified in a particular Class
only to the extent that the Claim or Interest qualifies within the description
of that Class and shall be deemed classified in a different Class to the extent
that any remainder of the Claim or Interest qualifies within the description of
such different Class. Administrative Claims and Priority Tax Claims have not
been classified in accordance with section 1123(a)(1) of the Code, although the
treatment for such unclassified Claims is set forth below.

- ----------

(3) (continued...)

by (ii) the total number of Arch Capital Shares purchasable upon exercise of
Rights (which will be determined prior to soliciting votes on this Plan based on
the pricing mechanism set forth in Schedule II to the Merger Agreement).

                                      -14-
<PAGE>

            The treatment of and consideration to be provided on account of
Claims and Interests pursuant to this Plan shall be in full settlement, release
and discharge of such Claims and Interests; provided, that such discharge shall
not affect the liability of any other entity on, or the property of any other
entity encumbered to secure payment of, any such Claim or Interest, except as
otherwise provided in this Plan; and provided, further, that such discharge
shall not affect the Reorganized Debtors' obligations under and pursuant to this
Plan. The treatment of and consideration to be provided to Allowed Claim and
Interest holders in each Class shall apply to all of the Cases.

            No Claim shall entitle the holder thereof to a distribution of cash
or securities or to other consideration pursuant to this Plan unless, and only
to the extent that, such Claim is an Allowed Claim.

UNCLASSIFIED CLAIMS
- -------------------

            2.1   Administrative Claims.

                  A.    General. Subject to the provisions of Section 4.4(A) and
unless otherwise agreed by the holder of an Allowed Administrative Claim (in
which event such other agreement shall govern), each holder of an Allowed
Administrative Claim shall receive on account of such Administrative Claim: (i)
cash equal to the unpaid amount of such Allowed Administrative Claim; or (ii) at
the option of Reorganized Communications, payment in accordance with the
ordinary business terms of such Allowed Administrative Claim.

                  B.    Statutory Fees. On or before the Effective Date,
Administrative Claims for fees payable pursuant to section 1930 of title 28 of
the United States Code, 28 U.S.C. ss. 1930, as determined by the Bankruptcy
Court at the Confirmation Hearing, will be paid in cash in an amount equal to
the amount of such Administrative Claims. All such fees payable after the
Effective Date will be assumed by the Reorganized Debtors.

                  C.    Ordinary Course Liabilities. Administrative Claims based
on liabilities incurred by the Debtors in the ordinary course of their
businesses will be assumed and paid by Reorganized MCCA pursuant to the terms
and conditions of the particular transaction giving rise to such Administrative
Claim, without any further action by the holders of such Claims.

                  D.    Funding of Certain Administrative Claims. Arch shall
make available to Reorganized Communications any monies necessary for
Reorganized Communications to make timely payment of all Administrative Claims;
provided, that in the event the sum of Capped Administrative Claims and the
costs and expenses of the Standby Purchasers as provided in the Standby Purchase
Commitment exceeds $34,000,000, the number of Arch Common Shares constituting
the Creditor Stock Pool shall be reduced by a number of shares equal to (i) the
excess of the sum of (x) Capped Administrative Claims and (y) the costs and
expenses of the Standby Purchasers as provided in the Standby Purchase
Commitment over $34,000,000, divided by (ii) $25.315.

                                      -15-
<PAGE>

            2.2   Priority Tax Claims. Unless otherwise agreed by the holder of
an Allowed Priority Tax Claim (in which event such other agreement shall
govern), each holder of an Allowed Priority Tax Claim against any of the Debtors
shall, on the Effective Date, receive, at Arch's option, either (a) cash equal
to the amount of such Allowed Priority Tax Claim or (b) a promissory note
payable by Reorganized Communications in a principal amount equal to the amount
of such Allowed Priority Tax Claim on which interest shall accrue from and after
the Effective Date at the rate of 7% or such higher or lower rate as is
determined by the Bankruptcy Court to be appropriate under section 1129(a)(9)(C)
of the Code and shall be paid semiannually in arrears; the principal amount of
the promissory note shall be paid in full on a date or dates six (6) years after
the date of assessment of such Allowed Priority Tax Claim.

CLASSIFIED CLAIMS AGAINST AND INTERESTS IN THE DEBTORS
- ------------------------------------------------------

            2.3   Class 1 Claims (Priority Claims).

                  A.    Classification. Class 1 consists of all Priority Claims
against any of the Debtors.

                  B.    Allowance. Claims in Class 1 shall be allowed or
disallowed in accordance with Section 4.4(B) of this Plan and applicable
provisions of the Code and Bankruptcy Rules.

                  C.    Treatment. Allowed Claims in Class 1 shall be paid in
full in cash on the later of the Effective Date and a date that is as soon as
practicable after the date upon which such Claim becomes an Allowed Priority
Claim.

                  D.    Impairment and Voting. Class 1 Claims are unimpaired and
are not entitled to vote on this Plan.

            2.4   Class 2 Claims (Miscellaneous Secured Claims).

                  A.    Classification. Class 2 consists of all Miscellaneous
Secured Claims against any of the Debtors, if any.

                  B.    Allowance. Claims in Class 2 shall be allowed or
disallowed in accordance with Section 4.4(B) of this Plan and applicable
provisions of the Code and Bankruptcy Rules.

                  C.    Treatment. The legal, equitable and contractual rights
to which each holder of an Allowed Claim in Class 2 is entitled shall be left
unaltered or, at the option of the Reorganized Debtors, shall be left unimpaired
in the manner described in section 1124(2) of the Code.

                  D.    Impairment and Voting. Class 2 Claims are unimpaired and
are not entitled to vote on this Plan.

                                      -16-
<PAGE>

            2.5   Class 3 Claims (Customer Refund Claims).

                  A.    Classification. Class 3 consists of all Customer Refund
Claims against any of the Debtors not otherwise classified in Class 1 or Class
2.

                  B.    Allowance. Claims in Class 3 shall be allowed or
disallowed in accordance with Section 4.4(B) of this Plan and applicable
provisions of the Code and Bankruptcy Rules.

                  C.    Treatment. The legal, equitable and contractual rights
to which each holder of an Allowed Claim in Class 3 is entitled shall be left
unaltered or, at the option of the Reorganized Debtors, shall be left unimpaired
in the manner described in section 1124(2) of the Code.

                  D.    Impairment and Voting. Class 3 Claims are unimpaired and
are not entitled to vote on this Plan.

            2.6   Class 4 Claims (Claims arising under or related to the 1995
Credit Agreement).

                  A.    Classification. Class 4 consists of all Secured Claims
against any of the Debtors arising under or related to the 1995 Credit
Agreement.

                  B.    Allowance. Allowed Class 4 Claims shall consist of the
following unpaid obligations arising under the 1995 Credit Agreement, and shall
be Allowed in an aggregate amount equal to: (i) $649,000,000 minus the Net Tower
Sale Proceeds actually paid to the Pre-Petition Agent on behalf of the holders
of Allowed Class 4 Claims; (ii) reasonable accrued and unpaid commitment, letter
of credit and similar fees under the 1995 Credit Agreement, in an amount, as of
the Petition Date, equal to $179,148.29, together with any such amounts accrued
after the Petition Date and unpaid as of the Effective Date; (iii) the unpaid,
reasonable costs and expenses of the Pre-Petition Agent, to the extent provided
in the 1995 Credit Agreement; and (iv) the unpaid, reasonable costs and expenses
of the members of the Steering Committee for the Pre-Petition Lenders, other
than the Pre-Petition Agent, up to the aggregate amount of $1,000,000. Adequate
protection payments in connection with, and the costs and expenses of the
Pre-Petition Agent arising under, the 1995 Credit Agreement shall continue to be
paid in cash through the Effective Date at the rate and in the manner set forth
under the DIP Approval Orders. Class 4 Claims shall not include interest accrued
at the default rate under Section 5.4(c) of the 1995 Credit Agreement or
otherwise.

                  C.    Treatment. Each holder of an Allowed Claim in Class 4
shall receive, in full satisfaction of its Claim, cash equal to the amount of
its Allowed Claim, payable in accordance with Section 4.3(A).

                  D.    Impairment and Voting. Class 4 Claims are impaired and
are entitled to vote on this Plan.

                                      -17-
<PAGE>

            2.7   Class 5 Claims (Claims arising under or related to the Dial
Page Notes).

                  A.    Classification. Class 5 consists of all Claims against
any of the Debtors arising under or related to the Dial Page Notes, the Dial
Page Indenture and related agreements, other than Note Litigation Claims.

                  B.    Allowance. Class 5 Claims shall be Allowed Claims in the
sum of: (i) the outstanding principal amount of the Dial Page Notes; (ii) unpaid
interest on the Dial Page Notes accrued to the Effective Date calculated at the
non-default rate set forth in the Dial Page Notes; and (iii) the unpaid
reasonable fees and expenses of the trustee for the Dial Page Notes incurred
prior to the Petition Date, to the extent provided for in the Dial Page
Indenture.

                  C.    Treatment. Each holder of an Allowed Claim in Class 5
shall receive, in full satisfaction of its Claim, cash equal to the full amount
of its Allowed Claim, payable in accordance with Section 4.3(B).

                  D.    Impairment and Voting. Class 5 Claims are impaired and
are entitled to vote on this Plan.

            2.8   Class 6 Claims (Non-Priority Unsecured Claims).

                  A.    Classification. Class 6 consists of all Non-Priority
Unsecured Claims against any of the Debtors, including the Subordinated
Noteholder Claims.

                  B.    Allowance. (i) Class 6 Claims other than Subordinated
Noteholder Claims and Personal Injury Claims shall be allowed or disallowed in
accordance with Section 4.4(B) and applicable provisions of the Code and
Bankruptcy Rules, (ii) Subordinated Noteholder Claims other than Claims of the
indenture trustees under the Subordinated Indentures shall be Allowed Claims in
the sum of: (x) the outstanding principal amount (or outstanding accreted
principal amount, as the case may be) of the Subordinated Notes and (y) unpaid
interest on the Subordinated Notes accrued prior to the Petition Date calculated
at the non-default rate set forth in the Subordinated Notes, (iii) Subordinated
Noteholder Claims for the indenture trustees under the Subordinated Indentures
shall be Allowed Claims in an amount equal to the unpaid reasonable fees and
expenses of each such indenture trustee incurred prior to and after the Petition
Date through the Effective Date, to the extent provided for in the Subordinated
Indentures, and (iv) Personal Injury Claims shall be liquidated and allowed or
disallowed in the district court in which the Cases are pending, or in the
district court in the district in which the claim arose, as determined by the
district court in which the Cases are pending.

                  C.    Treatment.

                        1.    Each holder of an Allowed Claim in Class 6 (other
than the indenture trustees under the Subordinated Indentures) shall receive:

                                      -18-
<PAGE>

                        (a)   for each holder of an Allowed Claim as of the
                        Rights Offering Initial Record Date, from Arch on the
                        Rights Offering Commencement Date, its Rights Offering
                        Pro Rata Share of the Rights Offering Distribution Pool;

                        (b)   for each holder of a Claim that becomes an Allowed
                        Claim after the Rights Offering Initial Record Date but
                        before the Rights Offering Supplemental Record Date, (i)
                        from Arch, as soon as practicable after the Rights
                        Offering Supplemental Record Date, an amount of Rights
                        from the Rights Reserve equal to the amount of Rights
                        that would have been such holder's Rights Offering Pro
                        Rata Share of the Rights Offering Distribution Pool if
                        such holder's Claim had been an Allowed Claim as of the
                        Rights Offering Initial Record Date or, (ii) if the
                        number of Rights in the Rights Reserve on the Rights
                        Offering Supplemental Record Date is insufficient to
                        make the distribution set forth in clause (i), from
                        Arch, (x) its ratable share (based on such holders'
                        respective amounts of Allowed Class 6 Claims) of the
                        Rights in the Rights Reserve on such date and (y) its
                        Cash Equivalent of each Right (or portion thereof) that
                        would have been distributed pursuant to clause (i) if
                        sufficient Rights had been available in the Rights
                        Reserve on the Rights Offering Supplemental Record Date;

                        (c)   from Arch on the Effective Date, if such holder
                        has exercised any or all of its Rights in accordance
                        with the terms and conditions thereof, for each Right so
                        exercised, a Unit;

                        (d)   for each holder of a Claim in Class 6 that is not
                        Allowed as of the Rights Offering Supplemental Record
                        Date, from Arch, instead of receiving any Rights, as
                        soon as reasonably practical after such Claim becomes an
                        Allowed Claim (but no sooner than the Effective Date),
                        its Cash Equivalent;

                        (e)   from the Exchange Agent (x) if such Claim is an
                        Allowed Claim on the Effective Date, on or as soon as
                        practicable after the Effective Date, its Class 6 Pro
                        Rata Share of the Creditor Stock Pool or (y) if such
                        Claim is not an Allowed Claim on the Effective Date, on
                        a later date after which the Claim is Allowed, its Class
                        6 Pro Rata Share of the Creditor Stock Pool; and

                        (f)   from the Exchange Agent on the Final Distribution
                        Date, its Class 6 Adjusted Pro Rata Share of the Arch
                        Common Shares remaining in the Creditor Stock Pool, if
                        any, on such date; provided, that if there are fewer
                        than 10,000 Arch Common Shares remaining in the Creditor
                        Stock Pool on the Final Distribution

                                      -19-
<PAGE>

                        Date, no distribution will be made to holders of Allowed
                        Class 6 Claims on such date, and the Arch Common Shares
                        remaining in the Creditor Stock Pool on such date shall
                        be returned to Arch and become treasury shares.

                        2.    In lieu of the foregoing treatment, any holder of
a Claim in Class 6 of $1,000 or less may elect, by marking the appropriate box
on the Ballot sent to such holder, to receive cash equal to 50% of its Allowed
Claim, or, if such holder's claim is in excess of $1,000, such holder may elect
to have its Claim reduced to and Allowed at $1,000 and receive cash with respect
to such reduced Claim in accordance with this Section 2.8(C)(2).

                        3.    On the Effective Date, the Reorganized Debtors
shall pay to the indenture trustees under the Subordinated Indentures cash equal
to the amount of fees and expenses of the indenture trustees (including the
reasonable fees and expenses of counsel retained by the indenture trustees), in
accordance with and to the extent provided for in the Subordinated Indentures,
whether incurred prior or subsequent to the Petition Date, without application
by or on behalf of the indenture trustees or their respective counsel to the
Bankruptcy Court.

                  D.    Impairment and Voting. Class 6 Claims are impaired and
are entitled to vote on this Plan.

            2.9   Class 7 Claims (Note Litigation Claims).

                  A.    Classification. Class 7 consists of all Note Litigation
Claims against any of the Debtors.

                  B.    Treatment. The holders of Claims in Class 7 shall not be
entitled to receive or retain any property pursuant to this Plan on account of
their Claims.

                  C.    Impairment and Voting. Class 7 Claims are impaired and
are deemed not to have accepted this Plan.

            2.10  Class 8 Claims and Interests (Common Stock Claims and
Interests and Subordinated Indemnification Obligation Claims).

                  A.    Classification. Class 8 consists of all Interests
arising from or related to the Common Stock, all Common Stock Claims and all
Subordinated Indemnification Obligation Claims against any of the Debtors.

                  B.    Treatment. Interests in Class 8 shall be canceled, and
the holders of Claims and Interests in Class 8 shall not be entitled to receive
or retain any property on account of their Claims and Interests.

                                      -20-
<PAGE>

                  C.    Impairment and Voting. Class 8 Claims and Interests are
impaired and are deemed not to have accepted this Plan.

            2.11  Class 9 Claims and Interests (Subsidiary Claims and
Interests).

                  A.    Classification. Class 9 consists of all Subsidiary
Claims and Subsidiary Interests.

                  B.    Treatment. The Interests in Class 9 shall be canceled,
except that, in accordance with Section 4.2(B), Reorganized Communications shall
retain its Interests in Reorganized MCCA, and the holders of Claims and
Interests in Class 9 shall not be entitled to receive or retain any property on
account of such Claims and Interests.

                  C.    Impairment and Voting. Class 9 Claims and Interests are
impaired and are deemed not to have accepted this Plan.


                                   ARTICLE III
              TREATMENT OF EXECUTORY CONTRACTS AND UNEXPIRED LEASES
              -----------------------------------------------------

            3.1   Rejection. No later than 25 days prior to the Voting Deadline,
the Debtors, at the direction of Arch, shall prepare a schedule of the executory
contracts and unexpired leases to be rejected on the Effective Date (the
"Rejection Schedule"). The Rejection Schedule shall be filed and served on each
party to an executory contract or unexpired lease listed thereon to be rejected
by the Debtors no later than twenty days prior to the Voting Deadline. Any
claims for damages arising from the rejection of an executory contract or
unexpired lease listed on the Rejection Schedule must be filed by the Voting
Deadline and shall be determined, if necessary, at Confirmation. The Rejection
Schedule may be amended from and after the Confirmation Date for sixty days
thereafter (but in no event after the Effective Date) by the Debtors at the
direction of Arch and with notice to any party to an executory contract or
unexpired lease added to or removed from such schedule. Any claims for damages
arising from the rejection of an executory contract or unexpired lease rejected
after the Confirmation Date pursuant to this Section 3.1 must be filed within 20
days after receipt of notice of rejection of such contract. Any such Claims not
filed within the applicable 20-day period shall be barred and may not thereafter
be asserted.

            3.2   Assumption.

                  A.    Assumed Contracts. Each executory contract or unexpired
lease of the Debtors that has not expired by its own terms prior to the
Effective Date, has not been rejected during the Cases prior to Confirmation, is
not subject to a notice of rejection and is not rejected under this Plan shall,
by the terms of this Plan, be assumed by Reorganized MCCA pursuant to sections
365 and 1123(b)(2) of the Code on the Effective Date. All such assumed
contracts, unexpired leases, franchises and permits, and any contracts or
unexpired leases 

                                      -21-
<PAGE>

assumed by the Debtors by order of the Bankruptcy Court prior to the
Confirmation Date, shall be vested in and continue in effect for the benefit of
the Reorganized Debtors.

                  B.    Cure Payments and Release of Liability. The Debtors
shall, at least twenty days prior to the Voting Deadline, file and serve on all
parties to executory contracts and unexpired leases to be assumed as of the
Effective Date, and on the Pre-Petition Agent, the Committee and Arch a schedule
setting forth the amount of cure and compensation payments to be provided by the
Reorganized Debtors in accordance with section 365(b)(1) of the Code, which
schedule shall be acceptable to Arch. Objections to any such proposed cure
payment must be made by the Voting Deadline, and shall be determined, if
necessary, at the Confirmation Hearing. In the event the Debtors amend the
Rejection Schedule pursuant to Section 3.1 after the Confirmation Date to remove
an executory contract or unexpired lease therefrom, the Debtors shall, within
five days after such amendment to the Rejection Schedule, file and serve on all
parties to executory contracts and unexpired leases to be assumed as a result of
any such Schedule amendment, and on the Pre-Petition Agent, the Committee and
Arch, a supplemental schedule setting forth the amount of cure and compensation
payments to be provided by the Reorganized Debtors in accordance with section
365(b)(1) of the Code, which supplemental schedule of cure payments shall be
reasonably acceptable to Arch. Objections to any proposed cure payment set forth
in the supplemental schedule must be made within 20 days after receipt thereof.
A party to an assumed executory contract or unexpired lease that has not filed
an appropriate pleading with the Bankruptcy Court on or before the applicable
20-day period shall be deemed to have waived its right to dispute such amount.
All unpaid cure and compensation payments under any executory contracts or
unexpired leases that are assumed or assumed and assigned under this Plan
(including, without limitation, Claims filed in the Cases or listed in the
Schedules and Allowed by order of the Bankruptcy Court prior to the Confirmation
Date that relate to executory contracts or unexpired leases that are assumed or
assumed and assigned under this Plan) shall be made by the Reorganized Debtors
as soon as practicable after the Effective Date, but not later than thirty days
after the Effective Date; provided, that, in the event of a dispute regarding
the amount of any cure and compensation payments, the Reorganized Debtors shall
make such cure and compensation payments as may be required by section 365(b)(1)
of the Code following the entry of a Final Order resolving such dispute.

                  C.    Continuation of Employment Agreements and Benefits
Agreements. On the Effective Date, the Debtors shall assume pursuant to sections
365 and 1123(b)(2) of the Code the employment and benefit agreements set forth
on Schedule 1.

            3.3   Post-Petition Contracts and Leases. All contracts and leases
entered into by the Debtors after the Petition Date, including (a) the Tower
Sale Agreement and (b) the Master Lease between Communications and Pinnacle
Towers Inc. to be entered into pursuant to the Tower Sale Agreement, but
excluding the DIP Credit Agreement, shall be deemed assigned by the Debtors to
Reorganized MCCA on the Effective Date.

                                      -22-
<PAGE>

                                   ARTICLE IV
                             IMPLEMENTATION OF PLAN
                             ----------------------

            4.1   Actions Occurring Prior to the Effective Date.

                  A.    Actions Occurring Before the Confirmation Date.

                        1.    Rights Offering. Pursuant to the Merger Agreement,
Arch will commence the Rights Offering.

                        2.    Standby Purchase Commitments. Each of the Standby
Purchasers has executed the Standby Purchase Commitment, copies of which are
attached hereto as Exhibits B-1 through B-6.

                  B.    Actions Occurring Between the Confirmation Date and the
Effective Date.

                        1.    Management and Operation of Debtors. After the
Confirmation Date and until the Effective Date, the Debtors shall be managed by
substantially the same personnel that managed and operated the Debtors on the
Confirmation Date, subject to such changes as may be determined by the Board of
Directors of a Debtor in accordance with the Bylaws and Articles or Certificate
of Incorporation of such Debtor. During such period, the Debtors will conduct
their business in the usual, regular and ordinary course, in a manner consistent
with past practice, sound business practice and the terms of this Plan and the
Merger Agreement, and subject to their obligations as debtors-in-possession
pursuant to the Code.

                        2.    Continuation of Committee. The Committee shall
continue to exist after the Confirmation Date until the Effective Date with the
same power and authority, and the same ability to retain and compensate
professionals, as it had prior to the Confirmation Date, and shall be dissolved
on the Effective Date.

                        3.    Rights of Creditors and Committee. Between the
Confirmation Date and the Effective Date, the Committee, the holders of Claims
against and Interests in the Debtors and the indenture trustees for the Notes
shall be parties-in-interest in all proceedings in the Bankruptcy Court with the
same rights to participate in such proceedings as such persons had prior to
Confirmation.

                        4.    Term of Injunctions or Stays. All injunction or
stays, whether by operation of law or by order of the Bankruptcy Court, provided
for in the Cases pursuant to sections 105 or 362 of the Code or otherwise that
are in effect on the Confirmation Date shall remain in full force and effect
until the Effective Date.

                        5.    Sale of Rights Reserve. Arch shall select an agent
independent of Arch (as such term is defined in Regulation M promulgated under
the Securities

                                      -23-
<PAGE>

Exchange Act of 1934), which independent agent shall be reasonably acceptable to
the Debtors and the Committee, to sell Rights from the Rights Reserve in the
over-the-counter market on a date or dates no more than five business days in
advance of the Rights Offering Expiration Date.
All proceeds derived from such sale shall be distributed to Arch.

            4.2   Actions Occurring on the Effective Date.

                  A.    Revesting of Assets. Except as provided in this Plan,
all property of the estate, to the full extent of section 541 of the Code, and
any and all other rights and assets of the Debtors of every kind and nature
shall, on the Effective Date of this Plan, revest in the Reorganized Debtors
free and clear of all Liens, Claims and Interests other than those Liens, Claims
and Interests retained or created pursuant to this Plan.

                  B.    Merger. Effective as of the Effective Date but
immediately following the discharge of the Debtors described in Section 6.1,
each of the following transactions shall occur in the order listed: (i)
MobileMedia shall contribute all of its assets to Communications and thereafter
immediately dissolve, at which time the separate corporate existence of
MobileMedia shall cease; (ii) Communications shall merge with and into Merger
Subsidiary, and the separate corporate existence of Communications shall cease
as contemplated by the Merger Agreement; (iii) MCCA shall merge with and into
Delaware Subsidiary Co., a Delaware corporation originally a wholly owned direct
subsidiary of Communications and a wholly owned direct subsidiary of Merger
Subsidiary as a result of the merger described in clause (ii) of this Section
4.2(B), and the separate corporate existence of MCCA shall cease; (iv) all
wholly owned direct subsidiaries of MCCA shall be merged with and into Delaware
Subsidiary Co. (as successor to MCCA); (v) Merger Subsidiary (as successor to
Communications) shall contribute its interest in the common stock of FWS Radio,
Inc. to Delaware Subsidiary Co. (as successor to MCCA), and FWS Radio, Inc.
shall then be merged with and into Delaware Subsidiary Co. (as successor to
MCCA); (vi) MobileComm of the West, Inc., a wholly owned direct subsidiary of
Delaware Subsidiary Co. (as successor to MCCA) as a result of the mergers
described in clause (iv) of this Section 4.2(B), shall be merged with and into
Delaware Subsidiary Co. (as successor to MCCA); (vii) Dial Page Southeast, Inc.,
MobileMedia Communications, Inc. (California), MobileMedia DP Properties, Inc.,
MobileMedia Paging, Inc., MobileMedia PCS, Inc. and Radio Call Co. of Virginia,
Inc., all wholly owned direct subsidiaries of Merger Subsidiary (as successor to
Communications) shall be merged with and into Delaware Subsidiary Co. (as
successor to MCCA); (viii) Merger Subsidiary shall transfer its assets (other
than its shares of Delaware Subsidiary Co.) to Delaware Subsidiary Co.; and (ix)
Delaware Subsidiary Co. shall organize License Co. L.L.C. as a wholly owned
limited liability company of Delaware Subsidiary Co. and shall transfer the
Licenses then held by it to License Co. L.L.C. It is anticipated that License
Co. L.L.C. will be taxed as a branch of Delaware Subsidiary Co. Notwithstanding
the foregoing, Arch and the Reorganized Debtors retain their right to make such
changes in the post-Effective Date corporate structure of Arch and the
Reorganized Debtors as is determined in the business judgment of Arch and
Reorganized Communications.

                                      -24-
<PAGE>

                  C.    Amended Certificates of Incorporation and Corporate
Governance.

                        1.    Certificates of Incorporation. As of the Effective
Date, each Reorganized Debtor's Certificate of Incorporation shall comply with
section 1123(a)(6) of the Code.

                        2.    Bylaws. As of the Effective Date, the bylaws of
Reorganized Communications shall be the same as the bylaws of the Merger
Subsidiary as in effect immediately prior to the Effective Date (except that the
name of the corporation set forth therein shall be changed to "MobileMedia
Communications, Inc."), and the bylaws of Reorganized MCCA shall be the same as
the by laws of Delaware Subsidiary Co. as in effect immediately prior to the
Effective Date (except that the name of the corporation set forth therein shall
be changed to "Mobile Communications Corporation of America"). Each Reorganized
Debtor's Bylaws will be effective as of the Effective Date.

                        3.    Corporate Governance. The directors and officers
of each Debtor shall continue to serve in such capacities until the Effective
Date. As of the Effective Date, the directors and officers of each Debtor that
is not a Reorganized Debtor will be terminated, the directors and officers of
Merger Subsidiary immediately prior to the Effective Date shall become the
directors and officers of Reorganized Communications, the directors of Merger
Subsidiary immediately prior to the Effective Date shall become the directors of
Reorganized MCCA and the officers of Delaware Subsidiary Co. immediately prior
to the Effective Date shall become the officers of Reorganized MCCA. The Debtors
shall file with the Bankruptcy Court no later than ten (10) Business Days prior
to the Voting Deadline a statement setting forth the office, the names and
affiliations of, and the compensation proposed to be paid to, the individuals
intended to serve as directors and officers of each Reorganized Debtor, as well
as of Arch, on and after the Effective Date. On and after the Effective Date,
each Reorganized Debtor shall be governed in accordance with such Reorganized
Debtor's Certificate of Incorporation and such Reorganized Debtor's Bylaws.

                        4.    Amendments after the Effective Date. After the
Effective Date, each Reorganized Debtor's Certificate of Incorporation, each
Reorganized Debtor's Bylaws and the officers and directors of each Reorganized
Debtor shall be subject to such amendments or changes as may be made by law, or
by such Reorganized Debtor's Certificate of Incorporation or such Reorganized
Debtor's Bylaws.

                        5.    Estate Representative. Within 15 days after the
Confirmation Date, the Committee shall designate a person, subject to Arch's and
the Debtors' consent (which consent shall not be unreasonably withheld) (the
"Estate Representative"), who shall be responsible for the winding up of the
Debtors' estates after the Effective Date. The Estate Representative shall have
the authority to hire counsel and other advisors, to prosecute and settle
Disputed Claims, to oversee distributions by the Exchange Agent, to pursue any
preserved Causes of Action and otherwise to effect the closing of the Cases. The
Estate Representative shall be reimbursed for all reasonable expenses incurred
in the performance of his or her duties as Estate Representative by Arch based
on a monthly budget to be submitted to Arch no later 

                                      -25-
<PAGE>

than ten Business Days prior to the end of each month after the Effective Date
for the succeeding month, which Budget shall set forth in reasonable detail the
proposed activities to be undertaken by the Estate Representative during such
month and the estimated costs and expenses therefor. If Arch does not object to
such Budget within five Business Days after receipt thereof, it shall be the
final budget for such month. At least once every calendar quarter, the Estate
Representative shall report to Arch on the material activities taken in the
prior quarter and to be taken in the succeeding quarter, which activities shall
be reasonably acceptable to Arch.

                  D.    Cancellation of Stock. On and as of the Effective Date,
the Common Stock, and each share of capital stock of each Debtor other than
MobileMedia not owned, beneficially and of record, by MobileMedia or one of the
other Debtors, shall be canceled and rendered null and void.

            4.3   Distributions Occurring On and After the Effective Date.

                  A.    Distributions to Holders of Allowed Class 4 Claims. The
cash distribution to be made to the holders of Allowed Class 4 Claims shall be
made by wire transfer by Arch on the Effective Date or the first Business Day
thereafter to the Pre-Petition Agent, which shall, subject to the rights of the
Pre-Petition Agent, if any, against the other holders of Allowed Class 4 Claims
under the 1995 Credit Agreement, promptly transmit to each such holder its Pro
Rata Share of the cash provided by Arch; provided, that, if requested by a
Standby Purchaser in writing at least two days prior to the Effective Date, any
cash to be distributed to the Standby Purchaser on account of such Standby
Purchaser's Allowed Class 4 Claim shall, in accordance with the instructions
included in such written request, be applied on behalf of the Standby Purchaser
first to the payment of any amounts required to be paid by such Standby
Purchaser in accordance with its Standby Purchase Commitment.

                  B.    Distributions to Holders of Dial Page Notes.

                        1.    Exchange of Notes. The cash distribution to be
made to the holders of Allowed Class 5 Claims shall be made by Reorganized
Communications to the Dial Page Indenture Trustee on the Effective Date or the
first Business Day thereafter, which shall, subject to the rights of such Dial
Page Indenture Trustee as against holders of the Dial Page Notes under the Dial
Page Indenture, transmit, upon surrender by a holder of its Dial Page Notes, the
cash to which such holder is entitled under Section 2.7(C). The reasonable fees
and expenses of the Dial Page Indenture Trustee incurred solely in connection
with making such distributions, unless otherwise paid hereunder, shall be paid
by Reorganized Communications to the extent so required by the Dial Page
Indenture or as otherwise agreed between Reorganized Communications, the Dial
Page Indenture Trustee and Arch, and in any case subject to required approvals
of the Bankruptcy Court, if any.

                        2.    Lost Notes. If a holder of a Dial Page Note is
unable to surrender such Note because it has been destroyed, lost or stolen,
such holder may receive a distribution with respect to such Note upon request to
the Dial Page Indenture Trustee in an acceptable form with: (i) proof of such
holder's title to such Note; (ii) proof of the destruction or

                                      -26-
<PAGE>

theft of such Note, or an affidavit to the effect that the same has been lost
and after diligent search cannot be found; and (iii) such indemnification as may
reasonably be required by the Reorganized Debtors to indemnify Arch, the
Reorganized Debtors, the Dial Page Indenture Trustee and all other persons
deemed appropriate by the Reorganized Debtors, against any loss, action, suit or
other claim whatsoever that may be made as a result of such holder's receipt of
a distribution on account of such Dial Page Note under this Plan.

                  C.    Distributions from Arch. Arch will distribute to each
holder of an Allowed Class 6 Claim and each Standby Purchaser that exercised its
Rights in accordance with the terms thereof (and, in the case of the Standby
Purchasers, in accordance with the terms of the Standby Purchase Commitment), on
the Effective Date, for each Right so exercised, the Arch Common Shares or Arch
Class B Shares, as applicable, and Arch Warrants together comprising the Units
subscribed for. Arch will distribute to each holder of an Allowed Class 6 Claim
that was not Allowed as of the Rights Offering Supplemental Record Date, as soon
as practicable after such Claim is Allowed (but no sooner than the Effective
Date), its Cash Equivalent, as provided in Section 2.8(C)(1)(d). In the event
the exercise of Rights and the purchase of the Units would cause (i) any
"person" or "group" (as such terms are used in Section 13(d) and 14(d) of the
Securities and Exchange Act of 1934) or (ii) the Standby Purchasers
collectively, on the Effective Date, in the aggregate, to beneficially own,
within the meaning of Section 13(d)(3) of the Securities Exchange Act of 1934
and Rule 13d-3 and 13d-5 promulgated thereunder (except that a Person shall be
deemed to have beneficial ownership of all securities that such Person has the
right to acquire, whether such right is exercisable immediately or only after
the passage of time), (a) more than 49.0% of the number of shares of the capital
stock of Arch generally entitled to vote in the election of directors or (b)
more than 49.0% of the total voting power of the capital stock of Arch, then,
the "person" or "group" or the Standby Purchasers, shall receive in lieu of the
Arch Common Shares included in such Units, Arch Class B Common Shares such that
(x) such "person" or "group" or (y) the Standby Purchasers collectively, on the
Effective Date, in the aggregate, beneficially own, within the meaning of
Section 13(d)(3) of the Securities Exchange Act of 1934, and Rule 13d-3 and
13d-5 promulgated thereunder (except that a Person shall be deemed to have
beneficial ownership of all securities that such Person has the right to
acquire, whether such right is exercisable immediately or only after the passage
of time), (i) no more than 49.0% of the number of shares of the capital stock of
Arch generally entitled to vote in the election of directors and (ii) no more
than 49.0% of the total voting power of the capital stock of Arch on the
Effective Date. For purposes of calculating the percentages referred to above,
it will be assumed that no additional Class 6 Claims are Allowed after the
Effective Date and all of the Arch Common Shares in the Creditor Stock Pool are
distributed to the Allowed Class 6 Claims as of the Effective Date.

                  D.    Distributions from the Exchange Agent. On the Effective
Date, Arch will deliver to the Exchange Agent a certificate, in the name of the
Exchange Agent, for the number of Arch Common Shares comprising the Creditor
Stock Pool. Distributions to the holders of Allowed Class 6 Claims other than on
account of the Rights, on the Effective Date and thereafter, shall be made by
the Exchange Agent on behalf of Reorganized Communications from the Arch Common
Shares evidenced by the certificate so delivered by Arch.

                                      -27-
<PAGE>

                        1.    Holders of the Subordinated Notes. As soon as
practicable after the Effective Date, Reorganized Communications shall cause the
Exchange Agent to send a notice and a transmittal form (which shall specify that
delivery shall be effected and risk of loss and title to the Subordinated Notes
shall pass, only upon delivery of the Subordinated Notes to the Exchange Agent,
and shall be in such form and have such other reasonable provisions as Arch may
reasonably specify) to each holder of a Subordinated Note advising such holder
of the effectiveness of the Merger and this Plan and the procedure for
surrendering to the Exchange Agent such Subordinated Note in exchange for the
Arch Common Shares issuable to it pursuant to Section 2.8(C).

            Commencing on the Effective Date, the Exchange Agent shall
distribute to each holder of an Allowed Claim that constitutes a Subordinated
Noteholder Claim, upon proper surrender of its Subordinated Notes, its Pro Rata
Share of the Creditor Stock Pool. Thereafter, on each Semi-Annual Distribution
Date, distributions of a holder's Pro Rata Share of the Creditor Stock Pool
shall be made to the holders of Allowed Class 6 Claims that constitute
Subordinated Noteholder Claims who have surrendered their Subordinated Notes
since the preceding SemiAnnual Distribution Date (or, with respect to the first
Semi-Annual Distribution Date, since the Effective Date). Final distributions of
Arch Common Shares shall be made on the Final Distribution Date to each holder
of an Allowed Class 6 Claim constituting a Subordinated Noteholder Claim based
on its Class 6 Adjusted Pro Rata Share of the remaining shares in the Creditor
Stock Pool (subject to Section 2.8(C)(1)(f)).

            In the event of a transfer of ownership of Subordinated Notes that
is not registered on the transfer records of the indenture trustee for such
Subordinated Notes, the securities to be distributed may be distributed to a
transferee of the Subordinated Notes if an executed letter of transmittal in
form satisfactory to the Exchange Agent is presented to the Exchange Agent,
accompanied by such documents as are required to evidence and effect such
transfer and by evidence that any applicable transfer taxes have been paid.

            After the Effective Date, there shall be no further registration of
transfers on the record books of Reorganized Communications of the Subordinated
Notes outstanding prior to the Effective Date. If, after the Effective Date, the
Subordinated Notes are presented to Reorganized Communications for any reason,
they shall be canceled and exchanged as provided in this Section 4.3(D)(1).

            If any Arch Common Shares are to be issued in the name of a person
other than the person in whose name the Subordinated Note surrendered in
exchange therefor is registered, it shall be a condition to the issuance of such
Arch Common Shares that (i) the Subordinated Note so surrendered shall be
transferable, and shall be properly assigned and endorsed, (ii) such transfer
shall otherwise be proper and (iii) the person requesting such transfer shall
pay to the Exchange Agent any transfer or other taxes payable by reason of the
foregoing or establish to the satisfaction of the Exchange Agent that such taxes
have been paid or are not required to be paid. Notwithstanding the foregoing,
neither the Exchange Agent nor any Person shall be liable to a holder of
Subordinated Notes for any Arch Common Shares issuable to such holder pursuant
to

                                      -28-
<PAGE>

Section 2.8(C) that are delivered to a public official pursuant to applicable
abandoned property, escheat or similar laws.

            No dividends or other distributions that are payable to the holders
of record of Arch Common Shares as of a date on or after the Effective Date
shall be paid to holders of Allowed Class 6 Claims entitled to receive Arch
Common Shares pursuant to Section 2.8(C) until such holders surrender their
Subordinated Notes in accordance with this Section 4.3(D)(1). Upon such
surrender, Arch shall pay or deliver to the persons in whose name the
certificates representing such Arch Common Shares are issued any dividends or
other distributions that have been paid or are payable to the holders of record
of Arch Common Shares as of a date on or after the Effective Date and which were
paid or delivered between the Effective Date and the time of such surrender;
provided, that no such person shall be entitled to receive any interest on such
interest payments, dividends or other distributions.

            If a holder of a Subordinated Note is unable to surrender such Note
because it has been destroyed, lost or stolen, such holder may receive a
distribution with respect to such Note upon request to the Exchange Agent in an
acceptable form with: (i) proof of such holder's title to such Note; (ii) proof
of the destruction or theft of such Note, or an affidavit to the effect that the
same has been lost and after diligent search cannot be found; and (iii) such
indemnification as may reasonably be required by the Reorganized Debtors to
indemnify Arch, the Reorganized Debtors, the Exchange Agent and all other
persons deemed appropriate by the Reorganized Debtors against any loss, action,
suit or other claim whatsoever that may be made as a result of such holder's
receipt of a distribution on account of such Subordinated Note under this Plan.

                        2.    Holders of Allowed Class 6 Claims other than the
Subordinated Noteholder Claims. On the Effective Date, the Exchange Agent shall
distribute to each holder of an Effective Date Allowed Claim other than a
Subordinated Noteholder Claim its Class 6 Pro Rata Share of the Creditor Stock
Pool. Thereafter, on each Semi-Annual Distribution Date, distributions of a
holder's Pro Rata Share of the Creditor Stock Pool shall be made to each holder
of a Class 6 Claim other than a Subordinated Noteholder Claim whose Claim has
been Allowed (as certified by the Estate Representative to the Exchange Agent)
since the preceding Semi-Annual Distribution Date (or, with respect to the first
Semi-Annual Distribution Date, since the Effective Date). Final distributions of
Arch Common Shares shall be made on the Final Distribution Date to each holder
of an Allowed Class 6 Claim other than a Subordinated Noteholder Claim based on
its Class 6 Adjusted Pro Rata Share of any shares remaining in the Creditor
Stock Pool (subject to Section 2.8(C)(1)(f)).

                        3.    Fractional Interests. The Arch Capital Shares
shall be issued and distributed in whole shares, and not in fractional shares.
To the extent that any holder would be entitled to a fractional Arch Capital
Share but for this provision, such holder shall, at Arch's option, (i) be paid
by Reorganized Communications cash in an amount equal to the fraction of said
share multiplied by the price of an Arch Capital Share on the Effective Date, or
(ii) receive the number of whole shares determined by rounding up to the next
whole number of shares. Arch Warrants shall be issued and distributed in whole
units, and not in fractional units. To the extent that any holder would be
entitled to a fractional Arch Warrant but for this 

                                      -29-
<PAGE>

provision, such holder shall receive the number of whole warrants determined by
rounding up to the next whole number of warrants. For purposes of this Section
4.3(D), holders of Allowed Claims under or evidenced by the Notes shall, in the
case of Notes held in street name, mean the beneficial holders thereof.

                  E.    Undeliverable Distributions.

                        1.    Method of Distribution. All property under this
Plan to be distributed by mail shall be sent to the latest mailing address filed
of record with the Bankruptcy Court for the party entitled thereto or, if no
such mailing address has been so filed, the mailing address reflected in the
Schedules or, in the case of the holder of Notes, to the latest mailing address
maintained of record by the pertinent indenture trustee or, if no mailing
address is maintained of record, to the pertinent indenture trustee.

                        2.    Holding and Investment of Undeliverable
Distributions. If any Allowed Claim holder's distribution is returned to the
Debtors, Reorganized Debtors, Arch or the Exchange Agent as undeliverable, no
further distributions will be made to such holder unless the Debtors,
Reorganized Debtors, Arch or the Exchange Agent, as applicable, are notified in
writing of such holder's then-current address. Undeliverable distributions will
remain in the possession of the Debtors, Reorganized Debtors, Arch or the
Exchange Agent, as applicable, pursuant to this Section 4.3(E)(2) until such
time as a distribution becomes deliverable. Undeliverable cash will be held in a
segregated bank account in the name of the Reorganized Debtors for the benefit
of the potential claimants of such funds and, until such time as such cash
becomes property of Arch pursuant to Section 4.3(E)(4), such cash will not
constitute property of Arch. The Reorganized Debtors will invest any
undeliverable cash in a manner consistent with the Reorganized Debtors'
investment and deposit practices. Undeliverable shares of newly-issued Arch
Common Shares will be held by the Exchange Agent for the benefit of the
potential claimants of such securities until the expiration of the time period
set forth in Section 4.3(E)(4).

                        3.    After Distributions Become Deliverable. On each
Semi-Annual Distribution Date and on the Final Distribution Date, the Debtors,
Reorganized Debtors, Arch or the Exchange Agent, as applicable, will make all
distributions that have, prior to such date, become deliverable to holders of
Allowed Claims. Each such distribution will include, to the extent applicable,
dividends or other distributions, if any, that would have been paid in respect
of the shares of Arch Common Shares or Arch Class B Common Shares distributed to
such holder from the Effective Date through the date of such distribution
(without any interest thereon).

                        4.    Undistributed Property. Any property that remains
undeliverable to the holders of Allowed Claims as of the later of the Final
Distribution Date and the date that is two years after the Effective Date shall
be delivered to, and become the property of, Arch.

                                      -30-
<PAGE>

                  F.    Compliance with Tax Requirements.

                        1.    In connection with this Plan, to the extent
applicable, the Reorganized Debtors will comply with all tax withholding and
reporting requirements imposed on them by any governmental unit, and all
distributions pursuant to this Plan that may be necessary or appropriate to
comply with such withholding and reporting requirements.

                        2.    Notwithstanding any other provision of this Plan,
each entity that has received any distribution pursuant to this Plan will have
sole and exclusive responsibility for the satisfaction and payment of any tax
obligation imposed by any governmental unit, including income, withholding and
other tax obligations, on account of such distribution.

            4.4   Procedure For Determination of Claims and Interests.

                  A.    Bar Date For Administrative Claims.

                        1.    All applications for compensation of professional
persons employed by the Debtors or the Committee pursuant to orders entered by
the Bankruptcy Court and on account of services rendered prior to the
Confirmation Date and all other requests for payment of administrative costs and
expenses incurred prior to the Confirmation Date pursuant to sections 507(a)(1)
or 503(b) of the Code (except for claims for taxes, trade debt and customer
deposits and credits incurred in the ordinary course of business after the
Petition Date) shall be served on the Reorganized Debtors, the DIP Agent, the
Pre-Petition Agent, the Committee and Arch, and filed with the Bankruptcy Court,
no later than 15 days after the Confirmation Date. Any such claim that is not
filed and served within this time shall be forever barred. Objections to any
such application must be filed within 15 days after receipt thereof; provided,
that Arch shall have no right to object to any such application for professional
fees. From and after the hearing on such applications, the Debtors (or the
Reorganized Debtors if the hearing is after the Effective Date) shall be
authorized to pay all of its and the Committee's professionals in full based on
monthly statements delivered to the Debtors subject to the final hearing
described in Section 4.4(A)(2).

                        2.    All applications for final compensation of
professional persons employed by the Debtors or the Committee pursuant to orders
entered by the Bankruptcy Court and on account of services rendered on or after
the Confirmation Date and prior to the Effective Date and all other requests for
payment of administrative costs and expenses incurred on or after the
Confirmation Date and prior to the Effective Date pursuant to sections 507(a)(1)
or 503(b) of the Code (except for claims for taxes, trade debt and customer
deposits and credits incurred in the ordinary course of business after the
Petition Date) shall be served on the Reorganized Debtors, the DIP Agent, the
Pre-Petition Agent, the Committee and Arch, and filed with the Bankruptcy Court,
no later than 15 days after the Effective Date. Any such claim that is not
served and filed within this time shall be forever barred. Objections to any
such application must be filed within 15 days after receipt thereof; provided,
that Arch shall have no right to object to any such application for professional
fees.

                                      -31-
<PAGE>

                  B.    Objections To Claims.

                        1.    Objections to any Administrative Claim (other than
Administrative Claims governed by Section 4.4(A)) and to any other Claim (other
than Class 6 Claims governed by the next sentence of this Section 4.4(B)(1))
must be filed no later than the Effective Date. Objections must be filed no
later than the Rights Offering Commencement Date as to any Class 6 Claim other
than Class 6 Claims relating to the rejection of executory contracts or
unexpired leases pursuant to this Plan. Objections shall be served on the holder
of any Claim being objected to and counsel for each of Arch, the Pre-Petition
Agent, the DIP Agent and the Committee. No distribution shall be made on account
of any Claim that is not Allowed. To the extent any property is distributed to
an entity on account of a Claim that is not an Allowed Claim, such property
shall be held in trust for and shall promptly be returned to the Reorganized
Debtors.

                        2.    On and after the Effective Date, only the Estate
Representative shall have authority to continue to prosecute, settle or withdraw
objections to Claims. After the Effective Date, the Estate Representative shall
be entitled to compromise or settle any Disputed Claim without seeking approval
of the Bankruptcy Court. The Estate Representative shall be paid subject to the
budget described in Section 4.2(C)(5), but without seeking approval of the
Bankruptcy Court.

                        3.    To the extent that a Disputed Claim ultimately
becomes an Allowed Claim, payments and distributions on account of such Allowed
Claim shall be made in accordance with the provisions of this Plan governing the
Class of Claims to which such Claim belongs. As soon as practicable after the
date that the order or judgment of the Bankruptcy Court allowing such Claim
becomes a Final Order, any property that would have been distributed prior to
the date on which a Disputed Claim becomes an Allowed Claim shall be
distributed, together with any dividends, payments or other distributions made
on account of such property from the date such distributions would have been due
had such Claim then been an Allowed Claim to the date such distributions are
made (without any interest thereon).

            4.5   Issuance of Arch Capital Shares. On and as of the Effective
Date, Arch will issue the Arch Common Shares and, if applicable pursuant to
Section 4.3(C), Arch Class B Common Shares to be distributed to the holders of
Allowed Class 6 Claims, to all persons that exercised Rights and, if applicable,
the Standby Purchasers.

            4.6   Issuance of Arch Warrants. On and as of the Effective Date,
Arch will issue the Arch Warrants contemplated by this Plan, the Rights, the
Standby Purchase Commitment and the Merger Agreement.

            4.7   Issuance of Rights. On and as of the Rights Offering
Commencement Date, Arch will issue the Rights, as contemplated by this Plan and
the Merger Agreement.

                                      -32-
<PAGE>

            4.8   Exemption from Securities Laws. All notes, instruments, stock
and other securities distributed pursuant to this Plan (other than the Rights
and the Units) are entitled to the benefits and exemptions provided by section
1145 of the Code.

            4.9   Registration Rights Agreement. Each Person (other than the
Standby Purchasers) that, as a result of the transactions contemplated by this
Plan, becomes the beneficial owner (within the meaning of Section 13(d)(3) of
the Securities Exchange Act of 1934) of at least 10% of the outstanding Arch
Capital Shares, shall be entitled to become a party to the Registration Rights
Agreement.

            4.10  Effectuating Documents; Further Transactions; Exemption From
Certain Transfer Taxes. The Chief Executive Officer, President, Chief Financial
Officer or any Vice President of Reorganized Communications or the Debtors, or
such other persons as the Bankruptcy Court may designate at the request of the
Debtors, will be authorized to execute, deliver, file or record such contracts,
instruments, releases, indentures and other agreements or documents and take
such actions as may be necessary or appropriate to effectuate and implement the
provisions of this Plan. The Secretary or any Assistant Secretary of each Debtor
or the Reorganized Debtors or such other persons as the Bankruptcy Court may
designate at the request of the Debtors will be authorized to certify or attest
to any of the foregoing actions.

                  Pursuant to section 1146(c) of the Code (a) the issuance,
transfer or exchange of Arch Capital Shares, (b) the creation of any mortgage
deed or trust or other security interest and (c) the making of any agreement or
instrument in furtherance of, or in connection with, this Plan, including any
merger agreements, agreements of consolidation, restructuring, disposition,
liquidation or dissolution, deeds, bills of sale, or assignments executed in
connection with the Merger Agreement, will not be subject to any stamp, real
estate transfer tax or similar tax.

            4.11  Release of Security Interests. Within ten Business Days after
the Confirmation Date, the Pre-Petition Agent shall deliver to Communications
UCC-3 termination statements and such other documents as are reasonably
requested by Communications to evidence the termination of the security
interests granted to the Pre-Petition Agent to secure amounts outstanding under
the 1995 Credit Agreement, which statements and other documents shall be held by
Communications in escrow and released for filing only upon receipt by the
Pre-Petition Agent of the distribution provided for in Section 4.3(A).


                                    ARTICLE V
                          CONDITIONS TO EFFECTIVE DATE
                          ----------------------------

            5.1   Conditions to Occurrence of Effective Date. Each of the
following is a condition to the Effective Date:

                  A.    That the Confirmation Order has been entered by the
Bankruptcy Court, more than ten (10) days have elapsed since the Confirmation
Date, no stay of the 

                                      -33-
<PAGE>

Confirmation Order is in effect and the Confirmation Order has not been
reversed, modified or vacated;

                  B.    That all conditions to the Closing under the Merger
Agreement (other than the condition set forth in Section 5.1(j) of the Merger
Agreement) have been satisfied or waived by the party entitled thereto, and the
Merger shall occur as contemplated by Section 4.2(B)(ii); and

                  C.    The commitments under the DIP Credit Agreement shall
have terminated, all amounts owing under or in respect of the DIP Credit
Agreement shall have been paid in full in cash and any outstanding letters of
credit issued under and in connection with the DIP Credit Agreement or the 1995
Credit Agreement shall have been terminated or satisfied, or the Debtors shall
have provided cash collateral therefor in accordance with the terms of the DIP
Credit Agreement or the 1995 Credit Agreement, as applicable.

            5.2   Effect of Non-occurrence of Conditions to the Effective Date.
If the Merger Agreement is terminated in accordance with its terms, then the
Confirmation Order shall be vacated by the Bankruptcy Court unless the Debtors,
Arch or the Committee files a motion opposing the vacation of the Confirmation
Order within ten Business Days after termination of the Merger Agreement. The
Confirmation Order may not be vacated after all the conditions to the Effective
Date have either occurred or been waived.

            5.3   Non-consensual Confirmation. Because Classes 7, 8 and 9 are
deemed not to have accepted this Plan pursuant to section 1126(g) of the Code,
as to such Classes and any other Class that votes to reject this Plan, the
Debtors are seeking confirmation of this Plan in accordance with section 1129(b)
of the Code either under the terms provided herein or upon such terms as may
exist if this Plan is modified in accordance with section 1127(d) of the Code.
In the event Class 4 votes to reject this Plan, the Debtors, the Committee and
Arch each reserves the right to contest all or any portion of the amount of the
Allowed Class 4 Claims as set forth in Section 2.6(B).


                                   ARTICLE VI
           DISCHARGE, TERMINATION, INJUNCTION AND SUBORDINATION RIGHTS
           -----------------------------------------------------------

            6.1   Discharge of Claims and Termination of Interests.

                  A.    Except as provided in the Confirmation Order, the rights
afforded under this Plan and the treatment of Claims and Interests under this
Plan will be in exchange for and in complete satisfaction, discharge and release
of all Claims and satisfaction or termination of all Interests, including any
interest accrued on Claims from the Petition Date. Except as provided in this
Plan or the Confirmation Order, Confirmation will, as of the Effective Date: (i)
discharge the Debtors from all Claims or other debts that arose before the
Effective Date, and all debts of the kind specified in sections 502(g), 502(h)
or 502(i) of the Code, whether or not (x) a proof of claim based on such debt is
filed or deemed filed pursuant to section 501 of the Code, 

                                      -34-
<PAGE>

(y) a Claim based on such debt is allowed pursuant to section 502 of the Code,
or (z) the holder of a Claim based on such debt has accepted this Plan and (ii)
satisfy or terminate all Interests and other rights of equity security holders
in the Debtors.

                  B.    As of the Effective Date, except as provided in this
Plan or the Confirmation Order, all entities will be precluded from asserting
against the Debtors or the Reorganized Debtors, or their respective successors
or property, any other or further Claims, demands, debts, rights, causes of
action, liabilities or equity interests based upon any act, omission,
transaction or other activity of any kind or nature that occurred prior to the
Effective Date. In accordance with the foregoing, except as provided in this
Plan or the Confirmation Order, the Confirmation Order will be a judicial
determination, as of the Effective Date, of discharge of all such Claims and
other debts and liabilities against the Debtors and satisfaction or termination
of all Interests and other rights of equity security holders in the Debtors,
pursuant to sections 524 and 1141 of the Bankruptcy Code, and such discharge
will void any judgment obtained against the Debtors or the Reorganized Debtors
at any time, to the extent that such judgment relates to a discharged Claim.

            6.2   Injunctions.

                  A.    Except as provided in this Plan or the Confirmation
Order, as of the Effective Date, all entities that have held, currently hold or
may hold a Claim or other debt or liability that is discharged or an Interest or
other right of an equity security holder that is terminated pursuant to the
terms of this Plan are permanently enjoined from taking any of the following
actions on account of any such discharged Claims, debts or liabilities or
terminated Interests or rights: (i) commencing or continuing in any manner any
action or other proceeding against the Debtors or the Reorganized Debtors or
Arch or its subsidiaries or their respective property; (ii) enforcing,
attaching, collecting or recovering in any manner any judgment, award, decree or
order against the Debtors or the Reorganized Debtors or Arch or its subsidiaries
or their respective property; (iii) creating, perfecting or enforcing any lien
or encumbrance against the Debtors or the Reorganized Debtors or Arch or its
subsidiaries or their respective property; (iv) asserting a setoff, right of
subrogation or recoupment of any kind against any debt, liability or obligation
due to the Debtors or the Reorganized Debtors or Arch or its subsidiaries or
their respective property; and (v) commencing or continuing any action, in any
manner, in any place that does not comply with or is inconsistent with the
provisions of this Plan.

                  B.    As of the Effective Date, all entities that have held,
currently hold or may hold a claim, demand, debt, right, cause of action or
liability that is released pursuant to this Plan are permanently enjoined from
taking any of the following actions on account of such released claims, demands,
debts, rights, causes of action or liabilities: (i) commencing or continuing in
any manner any action or other proceeding; (ii) enforcing, attaching, collecting
or recovering in any manner any judgment, award, decree or order; (iii)
creating, perfecting or enforcing any lien or encumbrance; (iv) asserting a
setoff, right of subrogation or recoupment of any kind against any debt,
liability or obligation due to any released entity; and (v) commencing or
continuing any action, in any manner, in any place that does not comply with or
is inconsistent with the provisions of this Plan.

                                      -35-
<PAGE>

                  C.    By accepting a distribution pursuant to this Plan, each
holder of an Allowed Claim receiving such distribution pursuant to this Plan
will be deemed to have specifically consented to the injunctions set forth in
this Section 6.2.

            6.3   Termination of Subordination Rights and Settlement of Related
Claims and Controversies.

                  A.    The classification and manner of satisfying all Claims
and Interests under this Plan takes into consideration all contractual, legal
and equitable subordination and turnover rights, whether arising under general
principles of equitable subordination, section 510(c) of the Code or otherwise,
that a holder of a Claim or Interest or the Debtors may have against other Claim
holders with respect to any distribution made pursuant to this Plan. On the
Effective Date, all contractual, legal, equitable subordination and turnover
rights that a holder of a Claim or Interest or the Debtors may have with respect
to any distribution to be made pursuant to this Plan will be discharged and
terminated, and all actions related to the enforcement of such subordination
rights will be permanently enjoined. Accordingly, distributions pursuant to this
Plan to holders of Allowed Claims will not be subject to payment to a
beneficiary of such terminated subordination rights, or to levy, garnishment,
attachment or other legal process by a beneficiary of such terminated
subordination rights.

                  B.    Pursuant to Bankruptcy Rule 9019 and in consideration
for the distributions and other benefits provided under this Plan, the
provisions of this Plan will constitute a good faith compromise and settlement
of all claims or controversies relating to the enforcement or termination of all
contractual, legal and equitable subordination and turnover rights that a holder
of a Claim or Interest or the Debtors may have with respect to any Allowed Claim
or Interest, or any distribution to be made pursuant to this Plan on account of
such Claim. The entry of the Confirmation Order will constitute the Bankruptcy
Court's approval of the compromise or settlement of all such claims or
controversies and the Bankruptcy Court's finding that such compromise or
settlement is in the best interests of the Debtors and the Reorganized Debtors
and their respective property and Claim and Interest holders, and is fair,
equitable and reasonable.


                                   ARTICLE VII
                                  MISCELLANEOUS
                                  -------------

            7.1   Retention of Jurisdiction. Following the Effective Date, the
Bankruptcy Court shall retain such jurisdiction as is set forth in this Plan.
Without in any manner limiting the scope of the foregoing, the Bankruptcy Court
shall retain jurisdiction for the following purposes:

                  A.    To determine the allowability, classification, priority
or subordination of Claims and Interests upon objection, or to estimate,
pursuant to section 502(c) of the Code, the amount of any Claim that is or is
anticipated to be contingent or unliquidated as of the Effective Date, or to
hear proceedings to subordinate Claims or Interests brought by any party in
interest with standing to bring such objection or proceeding;

                                      -36-
<PAGE>

                  B.    To construe and to take any action authorized by the
Code and requested by the Reorganized Debtors or any other party in interest to
enforce this Plan and the documents and agreements filed in connection with this
Plan, issue such orders as may be necessary for the implementation, execution
and consummation of this Plan, including, without limiting the generality of the
foregoing, orders to expedite regulatory decisions for the implementation of
this Plan and to ensure conformity with the terms and conditions of this Plan,
such documents and agreements and other orders of the Bankruptcy Court,
notwithstanding any otherwise applicable non-bankruptcy law;

                  C.    To determine any and all applications for allowance of
compensation and expense reimbursement of professionals retained by the Debtors,
the Reorganized Debtors or the Committee, and for members of the Committee, for
periods on or before the Effective Date, and to determine any other request for
payment of administrative expenses;

                  D.    To determine all matters that may be pending before the
Bankruptcy Court on or before the Effective Date;

                  E.    To resolve any dispute regarding the implementation or
interpretation of this Plan, the Merger Agreement or any related agreement or
document that arises at any time before the Cases are closed, including
determination, to the extent a dispute arises, of the entities entitled to a
distribution within any particular Class of Claims and of the scope and nature
of the Reorganized Debtors' obligations to cure defaults under assumed
contracts, leases, franchises and permits;

                  F.    To determine any and all applications pending on the
Confirmation Date for the rejection, assumption or assignment of executory
contracts or unexpired leases entered into prior to the Petition Date, and the
allowance of any Claim resulting therefrom;

                  G.    To determine all applications, adversary proceedings,
contested matters and other litigated matters that were brought or that could
have been brought on or before the Effective Date;

                  H.    To determine matters concerning local, state and federal
taxes in accordance with sections 346, 505 and 1146 of the Code, and to
determine any tax claims that may arise against the Debtors or Reorganized
Debtors as a result of the transactions contemplated by this Plan;

                  I.    To resolve any dispute arising out of actions taken by
the Estate Representative;

                  J.    To modify this Plan pursuant to section 1127 of the
Code, or to remedy any apparent nonmaterial defect or omission in this Plan, or
to reconcile any nonmaterial inconsistency in this Plan so as to carry out its
intent and purposes; and

                                      -37-
<PAGE>

                  K.    For such other purposes as may be provided for in the
Confirmation Order.

            Prior to the Effective Date, the Bankruptcy Court shall retain
jurisdiction with respect to each of the foregoing items and all other matters
that were subject to its jurisdiction prior to the Confirmation Date.

            7.2   Retention and Enforcement Of Causes Of Action. Pursuant to
section 1123(b)(3)(B) of the Code, but subject to Sections 7.3 and 7.4 of this
Plan, the Reorganized Debtors, on behalf of themselves and holders of Allowed
Claims and Interests, shall retain all Causes of Action that the Debtors had or
had power to assert immediately prior to the Effective Date, and may commence or
continue in any appropriate court or tribunal any suit or other proceeding for
the enforcement of such Causes of Action. All Causes of Action shall remain the
property of the Reorganized Debtors. Nothing contained in this Plan shall
constitute a waiver of the rights, if any, of the Debtors or the Reorganized
Debtors to a jury trial with respect to any Cause of Action or objection to any
Claim or Interest.

            7.3   Limitation of Liability. None of the Debtors, the Reorganized
Debtors, Arch or any affiliate thereof, the Committee, the Pre-Petition Agent,
the Pre-Petition Lenders, the DIP Agent, the DIP Lenders, the Standby
Purchasers, the indenture trustees for the Notes, Arch's financing sources, nor
any of their respective officers, directors, employees, members, agents,
underwriters or investment bankers, nor any other professional Persons employed
by any of them (collectively, the "Exculpated Persons"), shall have or incur any
liability to any Person for any act taken or omission made in good faith in
connection with or related to formulating, negotiating, implementing, confirming
or consummating this Plan, the Disclosure Statement or any contract, instrument,
release or other agreement or document created in connection with this Plan. The
Exculpated Persons shall have no liability to any Debtor, holder of a Claim,
holder of an Interest, other party in interest in the Cases or any other Person
for actions taken or not taken under this Plan, in connection herewith or with
respect hereto, or arising out of their administration of this Plan or the
property to be distributed under this Plan, in good faith, including, without
limitation, failure to obtain Confirmation of this Plan or to satisfy any
condition or conditions, or refusal to waive any condition or conditions, to the
occurrence of the Effective Date, and in all respects such Exculpated Persons
shall be entitled to rely upon the advice of counsel with respect to their
duties and responsibilities under this Plan.

            7.4   Releases.

                  A.    On the Effective Date, the Reorganized Debtors, on their
own behalf and as representatives of the Debtors' estates, in consideration of
services rendered in the Cases and other good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged, release
unconditionally, and are deemed to release unconditionally, each of the Debtors'
(1) present officers and directors, (2) former officers and directors (other
than those former officers and directors considered or determined as of the
Effective Date by the FCC to be alleged or actual wrongdoers for purposes of the
FCC Proceeding), (3) the entities that elected such directors to the extent they
are or may be liable for the actions or inactions of such directors 

                                      -38-
<PAGE>

and (4) their respective professional advisers (collectively, the "Officer and
Director Releasees"), from any and all claims, obligations, suits, judgments,
damages, rights, causes of action and liabilities whatsoever (including, without
limitation, those arising under the Code), whether known or unknown, foreseen or
unforeseen, existing or hereafter arising, in law, equity or otherwise, based in
whole or in part on any act, omission, transaction, event or other occurrence
taking place before, on or after the Petition Date up to the Effective Date, in
any way relating to the Debtors (before, on or after the Petition Date), the
Cases or this Plan (collectively, the "Released Matters"); provided, that the
foregoing release shall not apply to any action or omission that constitutes
actual fraud or criminal behavior; and provided, further, that such release
shall not be granted to any Officer or Director Releasee who has a Disputed
Claim as of the Effective Date.

                  B.    On the Effective Date, the Reorganized Debtors, on their
own behalf and as representatives of the Debtors' estates, in consideration of
services rendered in the Cases and other good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged, release
unconditionally, and are deemed to release unconditionally, each of (1) the
Pre-Petition Lenders, the Pre-Petition Agent, the DIP Lenders and the DIP Agent
and (2) their respective professional advisers (collectively, the "Lender
Releasees"), from the Released Matters; provided, that the foregoing release
shall not apply to any action or omission that constitutes actual fraud or
criminal behavior.

                  C.    On the Effective Date, the Reorganized Debtors, on their
own behalf and as representatives of the Debtors' estates, in consideration of
services rendered in the Cases and other good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged, release
unconditionally, and are deemed to release unconditionally, (1) each member of
the Committee, the Committee and their respective present or former members,
officers, directors, employees, affiliates, advisors, attorneys or agents
(collectively, the "Representatives"), (2) the Standby Purchasers and their
Representatives, and (3) their respective professional advisers (collectively,
the "Creditor Releasees"), from the Released Matters; provided, that the
foregoing release shall not apply to any action or omission that constitutes
actual fraud or criminal behavior.

                  D.    On the Effective Date, the Reorganized Debtors, on their
own behalf and as representatives of the Debtors' estates, in consideration of
services rendered in the Cases and other good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged, release
unconditionally, and are deemed to release unconditionally, Arch, any affiliate
of Arch, or Arch's financing sources, agents, underwriters and investment
bankers and their respective professional advisers (collectively, the "Arch
Releasees") from the Released Matters; provided, that the foregoing release
shall not apply to any action or omission that constitutes actual fraud or
criminal behavior.

                  E.    On the Effective Date, Arch and its subsidiaries shall
be deemed to have unconditionally released the Officer and Director Releasees,
the Lender Releasees and the Creditor Releasees from the Released Matters;
provided, that the foregoing release shall not apply to any action or omission
that constitutes actual fraud or criminal behavior; and provided, 

                                      -39-
<PAGE>

further, that such release shall not be granted to any Officer or Director
Releasee who has a Disputed Claim as of the Effective Date.

                  F.    On the Effective Date, each holder of a Claim that is
entitled to vote on this Plan shall be deemed to have unconditionally released
the Officer and Director Releasees, the Lender Releasees, the Creditor Releasees
and the Arch Releasees from the Released Matters; provided, that the foregoing
release shall not apply to any action or omission that constitutes actual fraud
or criminal behavior and shall not constitute a release of any recovery such
holder would be entitled to as a plaintiff or putative plaintiff in the
Securities Actions or any action initiated after the date hereof based upon
similar factual allegations or alleging similar causes of action to the
Securities Actions; and provided, further, that a holder (other than Arch) may
elect, by checking the appropriate box or boxes provided on the Ballot, not to
grant such release as to the Officer and Director Releasees, the Lender
Releasees, the Creditor Releasees or the Arch Releasees, or all of them.

                  G.    The Confirmation Order shall contain a permanent
injunction to effectuate the releases granted in the foregoing Sections 7.4(A),
(B), (C), (D), (E) and (F). Any release granted pursuant to the foregoing
Sections 7.4(A), (B), (C), (D), (E) and (F) shall be ineffective and null and
void automatically and immediately upon the assertion by any released party of
any claim in any manner or in any forum against any party that granted the
release, and all Causes of Action that the Debtors had or had the power to
assert immediately prior to the Effective Date with respect to any such party
shall be preserved and become the property of the Reorganized Debtors pursuant
to Section 7.2.

            7.5   Indemnification Obligations; Directors' and Officers'
Liability Insurance.

                  A.    Director Indemnification Obligations and Excluded
Indemnification Obligations shall be deemed to be, and shall be treated as if
they are, executory contracts that are rejected pursuant to section 365 of the
Code. Any Claims arising out of the rejection of the Indemnification Obligations
pursuant to this Section 7.5(A) shall be subordinated in full under sections
510(b) and 510(c) of the Code.

                  B.    Benefit Plan Indemnification Obligations and
Indemnification Obligations with respect to officers and employees who are
officers and employees of the Debtors as of the Effective Date (other than
Excluded Indemnification Obligations) shall be deemed to be, and shall be
treated as though they are, executory contracts that are assumed agreements
under this Plan and such obligations (subject to any defenses thereto) shall
remain unaffected and shall not be discharged or impaired hereby, and any Claim
for indemnification filed by any such party shall not be an Allowed Claim
hereunder; provided, that the foregoing assumption shall not affect any release
of any such obligation given in writing to the Debtors before the Effective Date
or to the Reorganized Debtors on or after the Effective Date or any other
releases under Section 7.4.

                  C.    On the Effective Date, the Reorganized Debtors shall
purchase a "run-off" policy for the Debtors' current and former directors and
officers (other than those 

                                      -40-
<PAGE>

former officers and directors considered or determined as of the Effective Date
by the FCC to be alleged or actual wrongdoers for purposes of the FCC
Proceeding), which policy shall provide for aggregate coverage up to $40 million
(or such lesser amount as can be purchased for a premium of $750,000) for claims
made during a period of at least three (3) years following the Effective Date
based on alleged "wrongful acts" through the Effective Date, and shall contain
such other usual and customary terms and conditions as are approved by the Board
of Directors of MobileMedia.

                  D.    As of the Effective Date, Arch shall make available up
to an aggregate amount of $1,000,000 (the "Defense Fund") to be used by present
and former officers and directors (other than those former officers and
directors considered or determined as of the Effective Date by the FCC to be
alleged or actual wrongdoers for purposes of the FCC Proceeding) of the Debtors
solely for the costs and expenses (including reasonable attorneys' fees and
expenses) of defending the Securities Actions not otherwise covered by the
Debtors' insurance. The Defense Fund is being provided by Arch at its election
and not in exchange for any Claim or Interest by any officer or director.
Provision of the Defense Fund hereunder shall not negate, constitute a waiver or
modification of or otherwise impair the discharge of the Debtors and the
Reorganized Debtors under sections 524 and 1141 of the Code and this Plan. As a
condition to any officer or director obtaining amounts from the Defense Fund,
such officer or director shall deliver to Arch, at Arch's request, a release, in
form and substance reasonably acceptable to Arch, confirming the unconditional
release and discharge of the Arch Releasees and the Reorganized Debtors from the
Released Matters. Any officer or director shall be required to reimburse Arch
for any amounts obtained from the Defense Fund that are subsequently covered by
insurance.

            7.6   Terms Binding. Upon the entry of the Confirmation Order, all
provisions of this Plan, including all agreements, instruments and other
documents filed in connection with this Plan and executed by the Debtors, Arch
or the Reorganized Debtors in connection with this Plan, shall be binding upon
the Debtors, Arch, the Reorganized Debtors, all Claim and Interest holders and
all other entities that are affected in any manner by this Plan. All agreements,
instruments and other documents filed in connection with this Plan shall have
full force and effect, and shall bind all parties thereto as of the entry of the
Confirmation Order, whether or not such exhibits actually shall be executed by
parties other than the Debtors or the Reorganized Debtors, or shall be issued,
delivered or recorded on the Effective Date or thereafter.

           7.7   Additional Terms of Securities and Other Instruments. Any
modification of the Merger Agreement, the Arch Warrants, Arch Common Shares and
Arch Class B Common Shares, and all other securities or agreements issued or
entered into pursuant to this Plan after the Voting Deadline, shall be treated
as a Plan modification and shall be governed by section 1127 of the Code.

            7.8   Post-Consummation Effect of Evidences of Claims or Interests.
Notes, stock certificates and other evidence of Claims against or Interests in
the Debtors shall, effective on the Effective Date, represent only the right to
participate in the distributions contemplated by this Plan.

                                      -41-
<PAGE>

            7.9   Payment Dates. Whenever any payment to be made under this Plan
is due on a day other than a Business Day, such payment shall instead be made,
without interest, on the next succeeding Business Day.

            7.10  Successors and Assigns. The rights, benefits and obligations
of any person named or referred to in this Plan shall be binding upon, and shall
inure to the benefit of, the heir, executor, administrator, successor or
assignee of such person.

            7.11  Inconsistencies. In the event that there is any inconsistency
between this Plan and the Disclosure Statement, any exhibit to this Plan or any
other instrument or document created or executed pursuant to this Plan, this
Plan shall govern.

            7.12  Compliance with Applicable Law. It is intended that the
provisions of this Plan (including the implementation thereof) shall be in
compliance with applicable law, including, without limitation, the Code, the
Delaware General Corporation Law, as amended, the Communications Act of 1934, as
amended, the Securities Act of 1933, as amended, and the Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended, as well as, in each case, any
rules and regulations promulgated thereunder. If the Debtors shall conclude that
this Plan may not comply with any of the foregoing, then and in such event the
Debtors intend to amend this Plan in such respects as they deem necessary to
bring this Plan into compliance therewith.

            7.13  Governing Law. Except to the extent that the Code or any other
federal law is applicable or to the extent the law of a different jurisdiction
is validly elected by the Debtors, the rights, duties and obligations arising
under this Plan shall be governed in accordance with the substantive laws of the
United States of America and, to the extent federal law is not applicable, the
laws of the State of Delaware.

            7.14  Severability. If the Bankruptcy Court determines at the
Confirmation Hearing that any material provision of this Plan is invalid or
unenforceable, such provision, to the extent the Debtors, Arch and the Committee
agree, but subject to section 1127 of the Code, shall be severable from this
Plan and null and void, and, in such event, such determination shall in no way
limit or affect the enforceability or operative effect of any or all other
portions of this Plan.

            7.15  Incorporation by Reference. Each Exhibit or Schedule hereto is
incorporated herein by reference.

                                      -42-
<PAGE>

                 MOBILEMEDIA COMMUNICATIONS, INC.
                 MOBILEMEDIA CORPORATION
                 MOBILEMEDIA COMMUNICATIONS, INC. (CALIFORNIA)
                 MOBILEMEDIA DP PROPERTIES, INC.
                 MOBILEMEDIA PCS, INC.
                 DIAL PAGE SOUTHEAST, INC.
                 RADIO CALL COMPANY OF VA. INC.
                 MOBILEMEDIA PAGING, INC.
                 MOBILE COMMUNICATIONS CORPORATION OF AMERICA
                 MOBILECOMM OF THE SOUTHEAST, INC.
                 MOBILECOMM OF THE NORTHEAST, INC.
                 MOBILECOMM NATIONWIDE OPERATIONS, INC.
                 MOBILECOMM OF TENNESSEE, INC.
                 MOBILECOMM OF THE SOUTHEAST PRIVATE CARRIER
                   OPERATIONS, INC.
                 MOBILECOMM OF THE SOUTHWEST, INC.
                 MOBILECOMM OF FLORIDA, INC.
                 MOBILECOMM OF THE MIDSOUTH, INC.
                 FWS RADIO, INC.
                 MOBILECOMM OF THE WEST, INC.

                 Debtors and Debtors-in-Possession


                 By:
                    ------------------------------------------
                    Joseph A. Bondi
                     Chairman-Restructuring of
                     MobileMedia Corporation

                                      -43-
<PAGE>

J. Ronald Trost
James D. Johnson
Shelley C. Chapman
Lee M. Stein
SIDLEY & AUSTIN
875 Third Avenue
New York, New York  10022
(212) 906-2000

James L. Patton, Jr. (No. 2202)
Joel A. Waite (No. 2925)
YOUNG CONAWAY STARGATT & TAYLOR, LLP
11th Floor - Rodney Square North
P.O. Box 391
Wilmington, Delaware  19899
(302) 571-6600


COUNSEL TO DEBTORS AND DEBTORS-IN-POSSESSION

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                                TABLE OF CONTENTS

                                                                            Page


INTRODUCTION.................................................................  1
                                                                              
ARTICLE I                                                                     
DEFINITIONS; INTERPRETATION..................................................  1
      1.1   Definitions......................................................  1
      1.2   Interpretation................................................... 14
      1.3   Computation of Time.............................................. 14
                                                                              
ARTICLE II                                                                    
CLASSIFICATION AND TREATMENT OF CLAIMS AND INTERESTS......................... 14
      2.1   Administrative Claims............................................ 15
      2.2   Priority Tax Claims.............................................. 15
      2.3   Class 1 Claims (Priority Claims)................................. 16
      2.4   Class 2 Claims (Miscellaneous Secured Claims).................... 16
      2.5   Class 3 Claims (Customer Refund Claims).......................... 16
      2.6   Class 4 Claims (Claims arising under or related to                
            the 1995 Credit Agreement)....................................... 17
      2.7   Class 5 Claims (Claims arising under or related                   
            to the Dial Page Notes).......................................... 17
      2.8   Class 6 Claims (Non-Priority Unsecured Claims)................... 18
      2.9   Class 7 Claims (Note Litigation Claims).......................... 20
      2.10  Class 8 Claims and Interests (Common Stock Claims and Interests   
            and Subordinated Indemnification Obligation Claims).............. 20
      2.11  Class 9 Claims and Interests (Subsidiary Claims and Interests)... 21
                                                                              
ARTICLE III                                                                   
TREATMENT OF EXECUTORY CONTRACTS AND UNEXPIRED LEASES........................ 21
      3.1   Rejection........................................................ 21
      3.2   Assumption....................................................... 21
      3.3   Post-Petition Contracts and Leases............................... 22
                                                                              
ARTICLE IV                                                                    
IMPLEMENTATION OF PLAN....................................................... 23
      4.1   Actions Occurring Prior to the Effective Date.................... 23
      4.2   Actions Occurring on the Effective Date.......................... 24
      4.3   Distributions Occurring On and After the Effective Date.......... 26
      4.4   Procedure For Determination of Claims and Interests.............. 31
      4.5   Issuance of Arch Capital Shares.................................. 32
      4.6   Issuance of Arch Warrants........................................ 32
      4.7   Issuance of Rights............................................... 32
      4.8   Exemption from Securities Laws................................... 32

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<PAGE>

      4.9   Registration Rights Agreement.................................... 32
      4.10  Effectuating Documents; Further Transactions; Exemption From      
            Certain Transfer Taxes........................................... 33
      4.11  Release of Security Interests.................................... 33
                                                                              
ARTICLE V                                                                     
CONDITIONS TO EFFECTIVE DATE................................................. 33
      5.1   Conditions to Occurrence of Effective Date....................... 33
      5.2   Effect of Non-occurrence of Conditions to the Effective Date..... 34
      5.3   Non-consensual Confirmation...................................... 34
                                                                              
ARTICLE VI                                                                    
DISCHARGE, TERMINATION, INJUNCTION AND SUBORDINATION RIGHTS.................. 34
      6.1   Discharge of Claims and Termination of Interests................. 34
      6.2   Injunctions...................................................... 35
      6.3   Termination of Subordination Rights and Settlement of Related     
            Claims and Controversies......................................... 35
                                                                              
ARTICLE VII                                                                   
MISCELLANEOUS................................................................ 36
      7.1   Retention of Jurisdiction........................................ 36
      7.2   Retention and Enforcement Of Causes Of Action.................... 38
      7.3   Limitation of Liability.......................................... 38
      7.4   Releases......................................................... 38
      7.5   Indemnification Obligations; Directors' and Officers'             
            Liability Insurance.............................................. 40
      7.6   Terms Binding.................................................... 41
      7.7   Additional Terms of Securities and Other Instruments............. 41
      7.8   Post-Consummation Effect of Evidences of Claims or Interests..... 41
      7.9   Payment Dates.................................................... 41
      7.10  Successors and Assigns........................................... 41
      7.11  Inconsistencies.................................................. 42
      7.12  Compliance with Applicable Law................................... 42
      7.13  Governing Law.................................................... 42
      7.14  Severability..................................................... 42
      7.15  Incorporation by Reference....................................... 42
                                                                             

Exhibit A                                      Registration Rights Agreement
                                               (10% Holders)
Exhibits B-1 through B-4                       Standby Purchase Commitment

Schedule 1                                     Assumed Employment and Benefit
                                               Agreements

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                                                                       EXHIBIT B
                                                                       ---------


                            [Form for Buyer Warrants]

================================================================================







                                WARRANT AGREEMENT


                                     between


                               ARCH COMMUNICATIONS
                                   GROUP, INC.

                                       and

                              THE BANK OF NEW YORK







                                _________, 199__




================================================================================
<PAGE>

                                WARRANT AGREEMENT
                                -----------------

      This WARRANT AGREEMENT, dated as of ___________, 199__ (the "Agreement"),
is made and entered into by and between Arch Communications Group, Inc., a
Delaware corporation (the "Company"), and The Bank of New York, a
_______________________, as warrant agent (the "Warrant Agent").

                                    RECITALS
                                    --------

      WHEREAS, a plan of reorganization under Chapter 11 of the United States
Bankruptcy Code for MobileMedia Communications, Inc. ("MobileMedia"),
MobileMedia Corporation, the sole stockholder of MobileMedia ("Parent"), and all
of MobileMedia's subsidiaries (the "Plan") was confirmed on ________, 199_ by
order of the United States Bankruptcy Court for the District of Delaware in Case
Nos. 97-174 (PJW) through and including 97-192 (PJW), and has become effective;

      WHEREAS, in connection with the Plan, the Company, a wholly owned
subsidiary of the Company ("Merger Sub"), Parent and MobileMedia entered into an
Agreement and Plan of Merger, dated as of August ___, 1998 (the "Merger
Agreement"), pursuant to which MobileMedia has been merged with and into Merger
Sub, with Merger Sub continuing as the surviving corporation and a wholly owned
subsidiary of the Company;

      WHEREAS, the Plan and the Merger Agreement provide for the execution and
delivery of this Agreement by the Company and the issuance of warrants (the
"Warrants"), each Warrant initially representing the right to purchase one share
of Common Stock (as defined in Section 4.1(h)), on the terms and subject to the
conditions herein set forth; and

      WHEREAS, the Company desires the Warrant Agent to act on behalf of the
Company, and the Warrant Agent is willing to so act, in connection with the
issuance of Warrant Certificates (as defined in Section 1.2) and other matters
as provided herein.

      NOW, THEREFORE, in consideration of the mutual covenants herein set forth,
the parties hereto hereby agree as follows:

      1.    Issuance of Warrants; Form of Warrants.

      1.1.  Issuance of Warrants. On the terms and subject to the conditions set
forth in the Plan and the Merger Agreement, the Company will issue and deliver:
(a) an aggregate of ______________ Warrants issuable upon the proper exercise of
Rights (as defined in the Plan) or as contemplated by the Standby Purchase
Commitments (as defined in the Plan) in respect of unexercised Rights, (b) an
aggregate of __________ Warrants as contemplated by the Standby Purchase
Commitments as consideration for the commitments set forth therein, and (c) an
aggregate of __________ Warrants pursuant to the Buyer Distribution (as defined
in the Merger Agreement) as provided in Section 1.7(a) of the Merger Agreement.
The shares of Common
<PAGE>

Stock purchasable upon exercise of the Warrants are hereinafter referred to as
the "Warrant Shares." The purchase price per Warrant Share payable upon the
exercise of a Warrant (the "Warrant Price") will initially be $8.19. The Warrant
Price and the number and kind of Warrant Shares purchasable upon exercise of the
Warrants are subject to adjustment pursuant to the provisions of Section 4.

      1.2.  Form of Warrants. Each Warrant, including without limitation any
Warrants that may be issued upon partial exercise, replacement, or transfer of
Warrants, will be evidenced by, and subject to the terms of, a Warrant
certificate (including the Form of Exercise Notice and Form of Assignment to be
printed on the reverse thereof, a "Warrant Certificate") in substantially the
form of Exhibit A, with such changes, marks of identification or designation,
and such legends, summaries, or endorsements printed thereon as the Company may
deem appropriate and as are not inconsistent with the provisions of this
Agreement, or as may be required to comply with any applicable law or with any
rule or regulation made pursuant thereto. Notwithstanding the foregoing, Warrant
Certificates evidencing Warrants issued as contemplated by clause (a) or clause
(b) of the first sentence of Section 1.1 will not bear restrictive legends.

      1.3.  Countersignature of Warrants. The Warrant Certificates will be
executed on behalf of the Company by the manual or facsimile signature of its
Chairman of the Board, President, or any Vice President, and attested by its
Secretary or any Assistant Secretary. The Warrant Certificates will be manually
countersigned by the Warrant Agent and will not be valid for any purpose unless
so countersigned. In case any officer of the Company who has signed any of the
Warrant Certificates ceases to be such officer of the Company before
countersignature by the Warrant Agent and issuance and delivery by the Company,
such Warrant Certificates, nevertheless, may be countersigned by the Warrant
Agent, and issued and delivered by the Company with the same force and effect as
though the person who signed such Warrant Certificates had not ceased to be such
officer of the Company; and any Warrant Certificate may be signed on behalf of
the Company by any person who, at the actual date of the execution of such
Warrant Certificate, is a proper officer of the Company to sign such Warrant
Certificate, although on any other date such person was not such an officer.
Warrant Certificates will be dated the date of countersignature by the Warrant
Agent.

      1.4   Registration of Warrants. The Warrant Agent, on behalf of the
Company, will keep or cause to be kept, at the principal office of the Warrant
Agent designated for such purpose, books for registration and transfer of the
Warrant Certificates issued hereunder by the Company. Such books will show the
names and addresses of the respective holders of the Warrant Certificates, the
number of Warrants evidenced on its face by each of the Warrant Certificates,
and the date of each of the Warrant Certificates. The Company and the Warrant
Agent will be entitled to treat the registered holder of any Warrant Certificate
(the "Holder") as the sole owner of the Warrants represented by such Warrant
Certificate for all purposes and will not be bound to recognize any equitable or
other claim or interest in such Warrants on the part of any other person.
Neither the Company nor the Warrant Agent will be liable for any registration of
transfer

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<PAGE>

of any Warrants that are registered or to be registered in the name of a
fiduciary or the nominee of a fiduciary.

      2.    Transfer and Exchange of Warrants.

      2.1.  Transfer and Exchange. Any Warrant Certificate may, except to the
extent otherwise prohibited pursuant to this Agreement, be transferred, split
up, combined, or exchanged for another Warrant Certificate or Warrant
Certificates entitling the Holder thereof to purchase a like aggregate number of
Warrant Shares as the Warrant Certificate or Warrant Certificates surrendered
then entitled such Holder (or former Holder in the case of a transfer) to
purchase. Any Holder desiring to transfer, split up, combine, or exchange any
such Warrant Certificate will make such request in writing delivered to the
Warrant Agent, and will surrender the Warrant Certificate or Warrant
Certificates to be transferred, split up, combined, or exchanged, with the Form
of Assignment duly executed by the Holder thereof, at the principal office of
the Warrant Agent designated for such purpose. Thereupon or as promptly as
practicable thereafter, the Company will prepare, execute, and deliver to the
Warrant Agent, and the Warrant Agent will countersign and deliver, a Warrant
Certificate or Warrant Certificates, as the case may be, as so requested.
Neither the Company nor the Warrant Agent will be required to issue or deliver
any Warrant Certificates in connection with any transfer, split up, combination,
or exchange of Warrants or Warrant Certificates unless and until the person or
persons requesting the issuance or delivery thereof has paid to the Warrant
Agent the amount of any tax or governmental charge that may be payable in
connection with such transfer, split up, combination, or exchange or has
established to the satisfaction of the Warrant Agent that any tax or
governmental charge has been paid. Holders will not be required to pay any other
charge in connection with the transfer, split up, combination, or exchange of
Warrants.

      2.2.  Lost, Stolen, and Mutilated Warrant Certificates. Upon receipt by
the Company and the Warrant Agent of evidence reasonably satisfactory to them of
the loss, theft, destruction, or mutilation of a Warrant Certificate, and, in
case of loss, theft, or destruction, of indemnity or security reasonably
satisfactory to them, and reimbursement to the Company and the Warrant Agent of
all reasonable expenses incidental thereto, and upon surrender to the Warrant
Agent and cancellation of the Warrant Certificate if mutilated, the Company will
prepare, execute, and deliver a new Warrant Certificate of like tenor to the
Warrant Agent and the Warrant Agent will countersign and deliver such new
Warrant Certificate to the Holder in lieu of the Warrant Certificate so lost,
stolen, destroyed, or mutilated.

      2.3.  Payment of Taxes. The Company will pay all documentary or stamp
taxes, if any, attributable to the initial issuance of the Warrants and the
initial issuance of the Warrant Shares upon the exercise of Warrants; provided,
however, that the Company's obligations in this regard will in all events be
conditioned upon the Holder cooperating with the Company and the Warrant Agent
in any reasonable arrangement designed to minimize or eliminate any such taxes.
Neither the Company nor the Warrant Agent will be required to pay any tax or
governmental charge that may be payable in connection with any transfer, split
up, combination, or exchange of Warrants or

                                      -3-
<PAGE>

Warrant Certificates, and the Company will not be required to issue or deliver
such Warrant Certificates unless or until the person or persons requesting the
issuance thereof has paid to the Company the amount of such tax or governmental
charge or has established to the satisfaction of the Company that such tax or
governmental charge has been paid.

      2.4.  Cancellation and Destruction of Warrant Certificates. All Warrant
Certificates surrendered for the purpose of exercise, transfer, split up,
combination, or exchange will, if surrendered to the Company, be delivered to
the Warrant Agent for cancellation or in canceled form, or, if surrendered to
the Warrant Agent, will be canceled by it, and no Warrant Certificates will be
issued in lieu thereof except as expressly permitted by this Agreement. The
Company will deliver to the Warrant Agent for cancellation and retirement, and
the Warrant Agent will so cancel and retire, any other Warrant Certificate
purchased or acquired by the Company otherwise than upon the exercise thereof.
The Warrant Agent will deliver all canceled Warrant Certificates to the Company,
or will, at the written request of the Company, destroy such canceled Warrant
Certificates, and in such case will deliver a certificate of destruction thereof
to the Company.

      3.    Duration and Exercise of Warrants.

      3.1.  Duration and Exercise of Warrants. (a) Warrants may be exercised by
the Holder thereof, in whole or in part, at any time and from time to time after
the date hereof and prior to 5:00 p.m., New York City time, on September 1, 2001
(the "Expiration Date"); provided that Holders shall be able to exercise their
Warrants only if (i) (A) the Warrant Shares Registration Statement (as defined
in Section 10) is then in effect and the Company has delivered to each person
exercising a Warrant a current prospectus meeting the requirements of the
Securities Act of 1933, as amended (the "Securities Act"), or (B) the exercise
of such Warrants is exempt from the registration requirements of the Securities
Act, and (ii) the Warrant Shares are qualified for sale or exempt from
qualification under the applicable securities laws of the states in which the
Holder of the Warrants to be exercised, and, if applicable, the persons to whom
it is proposed that the Warrant Shares be issued on exercise of the Warrants,
reside. The Holder of Warrants may exercise them by delivering to the Warrant
Agent, at its principal office designated for such purpose, the following:

            (i)   the Warrant Certificate or Warrant Certificates representing
      the Warrants to be exercised, with the Form of Exercise Notice duly
      completed and executed by the Holder thereof; and

            (ii)  cash, a certified or bank cashier's check payable to the order
      of the Company, or a wire transfer of immediately available funds to an
      account designated by the Warrant Agent, in each case in an amount equal
      to the product of (A) the number of Warrant Shares purchasable upon the
      exercise of the Warrants designated for exercise in the Form of Exercise
      Notice and (B) the Warrant Price.

                                      -4-
<PAGE>

      (b)   Subject to Section 2.3 hereof, as promptly as practicable after an
exercise of Warrants in accordance with Section 3.1(a), and in any event within
10 Business Days (as defined in Section 3.2) after such exercise, the Warrant
Agent will (i) requisition from any transfer agent for the Common Stock (or make
available, if the Warrant Agent is the transfer agent) certificates representing
the number of Warrant Shares to be purchased (and the Company hereby irrevocably
authorizes and directs its transfer agent to comply with all such requests),
(ii) after receipt of such certificates, cause the same to be delivered to or
upon the order of the Holder exercising such Warrants, registered in such name
or names as may be designated by such Holder, (iii) when appropriate,
requisition from the Company the amount of cash to be paid in lieu of the
issuance of fractional Warrant Shares in accordance with the provisions of
Section 5, and (iv) when appropriate, after receipt, deliver such cash to or
upon the order of the Holder exercising such Warrants.

      (c)   If the number of Warrants represented by a Warrant Certificate are
not exercised in full, the Company will prepare, execute, and deliver to the
Warrant Agent a new Warrant Certificate evidencing Warrants equivalent to such
Warrants remaining unexercised and the Warrant Agent will countersign and
deliver such new Warrant Certificate to or upon the order of the Holder
exercising such Warrants, registered in such name or names as may be designated
by such Holder.

      (d)   The Company will take all such action as may be necessary to ensure
that all Warrant Shares delivered upon exercise of Warrants, at the time of
delivery of the certificates for such Warrant Shares, will (subject to payment
of the Warrant Price) be duly and validly authorized and issued, fully paid, and
nonassessable and, if shares of Common Stock are then listed on any national
securities exchange (as defined in the Securities Exchange Act of 1934, as
amended (the "Exchange Act")) or qualified for quotation on The Nasdaq Stock
Market, will be duly listed or qualified for quotation thereon, as the case may
be.

      (e)   In the event that the Company is obligated to pay cash in lieu of
fractional Warrant Shares pursuant to Section 5 in connection with any exercise
of Warrants, it will make all arrangements necessary so that such cash is
available for distribution by the Warrant Agent, if and when appropriate.

      (f)   The Company will pay all expenses, taxes, and other charges payable
in connection with the preparation, issuance, and delivery of certificates
representing Warrant Shares or Warrant Certificates representing unexercised
Warrants in connection with any exercise of Warrants in accordance with Section
3.1(a), except that, if any such certificates representing Warrant Shares or any
such Warrant Certificates are to be registered in a name or names other than
that of the Holder at the time of any such exercise of Warrants, funds
sufficient to pay all transfer or similar taxes payable as a result of such
transfer shall be paid by the Holder at the time of such exercise or promptly
upon receipt of a written request of the Company for payment thereof. In
connection with any exercise of Warrants in accordance with Section 3.1(a), the
Warrants will be deemed to have been exercised, any certificate representing
Warrant Shares or

                                      -5-
<PAGE>

any Warrant Certificate issued on account thereof will be deemed to have been
issued, and the person in whose name any such certificate or Warrant Certificate
is issued will be deemed for all purposes to have become a Holder of record of
the Warrant Shares or Warrants, as the case may be, represented thereby as of
the date of such exercise.

      3.2.  Certain Definitions. For purposes of this Agreement, (a) the term
"Business Day" means any day other than a Saturday, Sunday, or a day on which
banking institutions in the state of New York are authorized or obligated by law
or executive order to close and (b) the term "Trading Day" means any day on
which shares of Common Stock are traded on the principal national securities
exchange on which the shares of Common Stock are listed or admitted to trading
or, if shares of Common Stock are not so listed or admitted to trading, in the
over-the-counter market.

      4.    Adjustments of Warrant Price and Warrant Shares. The Warrant Price
and the number and kind of Warrant Shares purchasable upon exercise of the
Warrants will be subject to adjustment from time to time upon the occurrence of
certain events as provided in this Section 4.

      4.1.  Mechanical Adjustments. The Warrant Price and the number and kind of
Warrant Shares purchasable upon exercise of a Warrant will be subject to
adjustment as follows:

            (a)   Subject to Section 4.1(e), if the Company (i) pays a dividend
      or otherwise distributes to holders of its Common Stock, as such, shares
      of its capital stock (whether Common Stock or capital stock of any other
      class), (ii) subdivides its outstanding shares of Common Stock into a
      greater number of shares of Common Stock, (iii) combines its outstanding
      shares of Common Stock into a smaller number of shares of Common Stock, or
      (iv) issues any shares of its capital stock in a reclassification of its
      outstanding shares of Common Stock (including any such reclassification in
      connection with a consolidation, merger, or other business combination
      transaction in which the Company is the continuing or surviving
      corporation), then the number and kind of Warrant Shares purchasable upon
      exercise of each Warrant immediately prior thereto will be adjusted so
      that the Holder of each Warrant will be entitled to receive (A) in the
      case of a dividend or distribution, the sum of (1) the number of Warrant
      Shares that, if such Warrant had been exercised immediately prior to such
      adjustment, such Holder would have received upon such exercise and (2) the
      number and kind of additional shares of capital stock that such Holder
      would have been entitled to receive as a result of such dividend or
      distribution by virtue of its ownership of such Warrant Shares, (B) in the
      case of a subdivision or combination, the number of Warrant Shares that,
      if such Warrant had been exercised immediately prior to such adjustment,
      such Holder would have received upon such exercise, adjusted to give
      effect to such subdivision or combination as if such Warrant Shares had
      been subject thereto, or (C) in the case of an issuance in a
      reclassification, the sum of (1) the number of Warrant Shares that, if
      such Warrant had been exercised immediately prior to such adjustment, such
      Holder would have received upon such exercise and retained after giving
      effect to such reclassification as if such Warrants Shares had been
      subject thereto and

                                      -6-
<PAGE>

      (2) the number and kind of additional shares of capital stock that such
      Holder would have been entitled to receive as a result of such
      reclassification as if such Warrant Shares had been subject thereto. An
      adjustment made pursuant to this paragraph (a) will become effective
      immediately after the record date for the determination of stockholders
      entitled to receive such dividend or distribution in the case of a
      dividend or distribution and will become effective immediately after the
      effective date of such subdivision, combination, or reclassification in
      the case of a subdivision, combination, or reclassification. If, after an
      adjustment, a Holder of a Warrant upon exercise of it may receive shares
      of two or more classes of capital stock of the Company, the Company shall
      determine the allocation of the adjusted Warrant Price between the classes
      of capital stock. After such allocation, the exercise privilege and the
      Warrant Price of each class of capital stock shall thereafter be subject
      to adjustments as nearly equivalent as may be practicable to the
      adjustments provided for Common Stock in this Section 4. Such adjustments
      shall be made successively whenever any event listed above shall occur.

            (b)   Subject to Section 4.1(e), if the Company distributes to
      holders of its Common Stock, as such, (i) evidences of indebtedness or
      assets (excluding regular cash dividends or cash distributions payable out
      of consolidated retained earnings) of the Company or any corporation or
      other legal entity a majority of the voting equity securities or equity
      interests of which are owned, directly or indirectly, by the Company (a
      "Subsidiary"), (ii) shares of capital stock of any Subsidiary, (iii)
      securities convertible into or exchangeable for capital stock of the
      Company (including Common Stock or capital stock of any other class) or
      any Subsidiary, or (iv) any rights, options, or warrants to purchase any
      of the foregoing (excluding those described in Section 4.1(c)), then the
      number of Warrant Shares thereafter purchasable upon exercise of each
      Warrant will be adjusted to the number that results from multiplying the
      number of Warrant Shares purchasable upon the exercise of each Warrant
      immediately prior to such adjustment by a fraction, the numerator of which
      will be the Current Market Price per share (as defined in Section 4.1(d))
      of Common Stock on the record date for such distribution, and the
      denominator of which will be such Current Market Price per share of Common
      Stock less the fair value (as determined in good faith by the Board of
      Directors of the Company, whose determination will be conclusive if based
      on the financial advice of a nationally recognized investment banking
      firm) of the portion of the evidences of indebtedness, assets, securities,
      or rights, options, or warrants so distributed on account of one share of
      Common Stock. Such adjustment will be made whenever any such distribution
      is made, and will become effective immediately after the record date for
      the determination of stockholders entitled to receive such distribution.
      Except as provided in Section 4.1(h), no further adjustments of the number
      of Warrant Shares will be made upon the actual issue of shares of Common
      Stock upon conversion or exchange of such securities convertible or
      exchangeable for shares of Common Stock or upon exercise of such rights,
      warrants, or options for shares of Common Stock.

                                      -7-
<PAGE>

            (c)   Subject to Section 4.1(e), if the Company issues rights,
      options, or warrants to holders of the outstanding shares of Common Stock,
      as such, entitling the holders of such rights, options, or warrants (for a
      period expiring within 60 calendar days after the record date mentioned
      below) to subscribe for or purchase shares of Common Stock at a price per
      share that is lower on the record date mentioned below than the Current
      Market Price per share of Common Stock on such record date, then the
      number of Warrant Shares thereafter purchasable upon the exercise of each
      Warrant will be adjusted to the number that results from multiplying the
      number of Warrant Shares purchasable upon exercise of each Warrant
      immediately prior to such adjustment by a fraction (not to be less than
      one), the numerator of which will be the number of shares of Common Stock
      outstanding on such record date plus the number of additional shares of
      Common Stock offered by such rights, options, or warrants for subscription
      or purchase and the denominator of which will be the number of shares of
      Common Stock outstanding on such record date plus the number of shares of
      Common Stock which the aggregate subscription or purchase price of the
      total number of shares of Common Stock so offered would purchase at the
      Current Market Price per share of Common Stock on such record date. Such
      adjustment will be made whenever such rights, options, or warrants are
      issued, and will become effective immediately after the record date for
      the determination of stockholders entitled to receive such rights,
      options, or warrants. In case such subscription or purchase price may be
      paid in a consideration part or all of which is in a form other than cash,
      the fair value of such consideration will be as determined by the Board of
      Directors of the Company, whose determination will be conclusive if based
      on the financial advice of a nationally recognized investment banking
      firm. Except as provided in Section 4.1(h), no further adjustments of the
      number of Warrant Shares will be made upon the actual issue of shares of
      Common Stock upon exercise of such rights, options, or warrants.

            (d)   For purposes of this Agreement, the "Current Market Price" per
      share of Common Stock on any date will be the average of the daily Closing
      Prices (as defined below in this Section 4.1(d)) for 30 consecutive
      Trading Days commencing 45 Trading Days before the date of such
      computation. The closing price for each day (the "Closing Price") will be
      the last reported sales price regular way or, in case no such reported
      sale takes place on such day, the average of the closing bid and asked
      prices regular way for such day, in each case on the principal national
      securities exchange on which the shares of Common Stock are listed or
      admitted to trading or, if not so listed or admitted to trading, the
      average of the closing bid and asked prices of the shares of Common Stock
      in the over-the-counter market as reported by The Nasdaq Stock Market or
      any comparable system, or if not so reported by any such organization on
      such day, the average of the bid and asked prices furnished by a
      professional market maker selected by the Board of Directors of the
      Company. In the absence of one or more such quotations, the Board of
      Directors of the Company will determine the Current Market Price in good
      faith on the basis of such quotations or other relevant information as it
      considers appropriate.

                                      -8-
<PAGE>

            (e)   No adjustment in the number of Warrant Shares purchasable upon
      the exercise of a Warrant will be required unless such adjustment would
      require an increase or decrease in the number of Warrant Shares
      purchasable upon the hypothetical exercise of a Warrant of at least 1%;
      provided, however, that any adjustments which by reason of this paragraph
      (e) are not required to be made currently will be carried forward and made
      at the time and together with the next subsequent adjustment which,
      together with any adjustments so carried forward, would require an
      increase or decrease in the number of Warrant Shares purchasable upon the
      hypothetical exercise of a Warrant of 1% or more. All calculations with
      respect to the number of Warrant Shares will be made to the nearest
      one-thousandth of a share and all calculations with respect to the Warrant
      Price will be to the nearest whole cent. No adjustment in the number of
      Warrant Shares purchasable upon the exercise of a Warrant will be made
      under paragraph (b) or (c) of this Section 4.1 if the Company issues or
      distributes to each Holder the shares, rights, options, warrants,
      convertible or exchangeable securities, evidences of indebtedness, assets,
      or other securities referred to in the applicable paragraph that such
      Holder would have been entitled to receive had the Warrants been exercised
      prior to the happening of such event on the record date with respect
      thereto (provided that, in any case in which such Holder would have been
      so entitled to receive a fractional interest in any such securities or
      assets, the Company may distribute to such Holder in lieu of such
      fractional interest cash in an amount equal to the fair value of such
      fractional interest as determined in good faith by the Board of Directors
      of the Company). No adjustment in the number of Warrant Shares will be
      made for a change in the par value of the shares of Common Stock.

            (f)   Whenever the number of Warrant Shares purchasable upon the
      exercise of each Warrant is adjusted as herein provided, the Warrant Price
      will be adjusted by multiplying the Warrant Price in effect immediately
      prior to such adjustment by a fraction, the numerator of which will be the
      number of Warrant Shares purchasable upon the exercise of each Warrant
      immediately prior to such adjustment, and the denominator of which will be
      the number of Warrant Shares so purchasable immediately thereafter.

            (g)   For the purpose of this Agreement, the term "Common Stock"
      means (i) the class of shares designated as the Common Stock of the
      Company as of the date of this Agreement, (ii) all shares of any class or
      classes (however designated) of the Company, now or hereafter authorized,
      the holders of which have the right, without limitation as to amount,
      either to all or to a part of the balance of current dividends and
      liquidating dividends after the payment of dividends and distributions on
      any shares entitled to preference, and the holders of which are ordinarily
      entitled to vote generally in the election of directors of the Company, or
      (iii) any other class of shares resulting from successive changes or
      reclassifications of such shares consisting solely of changes in par
      value, or from par value to no par value, or from no par value to par
      value. In the event that at any time, as a result of an adjustment made
      pursuant to Section 4.1(a), the Warrants become exercisable to purchase
      Warrant Shares other than shares of Common Stock, thereafter the number of
      such other shares so purchasable upon exercise of each

                                      -9-
<PAGE>

      Warrant and the Warrant Price payable in respect of such other shares upon
      the exercise of each Warrant will be subject to adjustment from time to
      time in a manner and on terms as nearly equivalent as practicable to the
      provisions with respect to the Warrant Shares and the Warrant Price
      contained in this Section 4.1.

            (h)   Upon the expiration of any rights, options, warrants, or
      conversion or exchange privileges, if any thereof have not been exercised,
      the Warrant Price and the number of Warrant Shares purchasable upon the
      exercise of each Warrant will, upon such expiration, be readjusted and
      will thereafter be such as it would have been had it been originally
      adjusted (or had the original adjustment not been required, as the case
      may be) as if (i) the only shares of Common Stock so issued were the
      shares of Common Stock, if any, actually issued or sold upon the exercise
      of such rights, options, warrants, or conversion or exchange rights and
      (ii) such shares of Common Stock, if any, were issued or sold for the
      consideration actually received by the Company upon such exercise,
      conversion, or exchange plus the aggregate consideration, if any, actually
      received by the Company for the issuance, sale, or grant of all such
      rights, options, warrants, or conversion or exchange rights whether or not
      exercised; provided, however, that no such readjustment will have the
      effect of increasing the Warrant Price or decreasing the number of Warrant
      Shares purchasable upon the exercise of each Warrant by an amount in
      excess of the amount of the adjustment initially made in respect of the
      issuance, sale, or grant of such rights, options, warrants, or conversion
      or exchange privileges.

      4.2.  Notice of Adjustment. Whenever the Warrant Price or the number or
kind of Warrant Shares purchasable upon exercise of the Warrants is adjusted
pursuant to any of the provisions of this Agreement, the Company will promptly
give notice to the Holders of such adjustment or adjustments, together with a
certificate of a firm of independent public accountants selected by the Company
(who may be the regular accountants employed by the Company) setting forth the
adjustments in the Warrant Price and the number or kind of Warrant Shares
purchasable upon exercise of each Warrant, and also setting forth a brief
statement of the facts requiring such adjustments and the computations upon
which such adjustments are based. Such certificate will be conclusive evidence
of the correctness of such adjustments.

      4.3.  No Adjustment for Dividends. Except as provided in Section 4.1, no
adjustment or payment in respect of any dividends will be made at any time.

      4.4   Voluntary Reduction. The Company from time to time may reduce the
Warrant Price by any amount for any period of time, if the period is at least 20
calendar days and if the reduction is irrevocable during the period; provided
that in no event may the Warrant Price be less than the par value of the Common
Stock. Whenever the Warrant Price is so reduced, the Company will mail to
Holders a notice of the reduction at least 15 calendar days before the date the
reduced Warrant Price takes effect. Such notice will state the reduced Warrant
Price and the period during which it will be in effect. Failure to mail the
notice or any defect therein will not affect the

                                      -10-
<PAGE>

legality or validity of the reduction. A reduction of the Warrant Price does not
change or adjust the Warrant Price otherwise in effect for purposes of Section
4.1.

      4.5.  Preservation of Purchase Rights Upon Merger, Consolidation, Etc. In
case of any consolidation, merger, or other business combination transaction in
which the Company is not the continuing or surviving corporation, or in case of
any sale, transfer, or lease to another corporation of all or substantially all
the property of the Company, the Company and such successor or purchasing
corporation, as the case may be, will execute an agreement providing that each
Holder will have the right thereafter, upon payment of an amount equal to the
amount payable upon the exercise of a Warrant immediately prior thereto, to
purchase upon exercise of each Warrant the kind and amount of securities or
property that it would have owned or have been entitled to receive after giving
effect to such consolidation, merger, sale, transfer, or lease on account of the
Warrant Shares that would have been purchasable upon the exercise of such
Warrant had such Warrant been exercised immediately prior thereto (provided
that, to the extent that such Holder would have been so entitled to receive cash
on account of such Warrant Shares, such Holder may elect in connection with the
exercise of a Warrant in accordance with Section 3.1 to reduce the amount of
cash that it would be entitled to receive upon such exercise in exchange for a
corresponding reduction in the amount payable upon such exercise); provided,
however, that no adjustment in respect of dividends, interest, or other income
on or from such shares or other securities or property will be made during the
term of a Warrant or upon the exercise of a Warrant. Such agreement will provide
for adjustments that will be as nearly equivalent as may be practicable to the
adjustments provided for in this Section 4. The provisions of this Section 4.5
will similarly apply to successive consolidations, mergers, sales, transfers, or
leases.

      4.6.  Warrant Certificates. Whether or not any adjustments in the Warrant
Price or the number or kind of Warrant Shares purchasable upon the exercise of
the Warrants has been made, Warrant Certificates theretofore or thereafter
issued may continue to express the same Warrant Price and number and kind of
Warrant Shares as are stated in the Warrant Certificate initially issued.

      5.    Fractional Interests. Neither the Company nor the Warrant Agent will
be required to issue fractional Warrant Shares or fractional interests in any
other securities upon the exercise of the Warrants. If any fraction of a Warrant
Share or other security would, except for the provisions of this Section 5, be
issuable upon the exercise of the Warrants, the Company will pay an amount
(computed to the nearest cent) in cash (a) in lieu of a fractional Warrant
Share, equal to the Current Market Price for one share of Common Stock, as
defined in Section 4.1(d), on the Trading Day immediately preceding the date on
which the Warrants are presented for exercise, multiplied by such fraction of a
Warrant Share or (b) in lieu of a fractional interest in any other security,
equal to the fair value of such fractional interest, determined in a manner as
similar as possible, taking into account the difference in the fractional
interest being valued, to the calculation described in the foregoing clause (a).

                                      -11-
<PAGE>

      6.    Warrant Agent Matters.

      6.1.  Appointment of Warrant Agent. The Company hereby appoints the
Warrant Agent to act as warrant agent in accordance with the terms and
conditions hereof, and the Warrant Agent hereby accepts such appointment.

      6.2.  Concerning the Warrant Agent. (a) The Company will pay to the
Warrant Agent reasonable compensation for all services rendered by it hereunder
and will reimburse the Warrant Agent for its reasonable expenses and counsel
fees and other disbursements incurred in the administration and execution of
this Agreement and the exercise and performance of its duties hereunder. The
Company will indemnify the Warrant Agent for, and hold it harmless against, any
loss, liability, suit, action, proceeding, or expense, incurred without
negligence, bad faith, or willful misconduct on the part of the Warrant Agent,
for anything done or omitted by the Warrant Agent in connection with the
acceptance and administration of this Agreement, including the costs and
expenses of defending against any claim of liability arising therefrom, directly
or indirectly.

      (b)   The Warrant Agent will incur no liability to the Company or to any
Holder for or in respect of any action taken, suffered, or omitted by it in
connection with its administration of this Agreement in reliance upon any
Warrant Certificate or certificate evidencing Common Stock or other securities
of the Company, instrument of assignment or transfer, power of attorney,
endorsement, affidavit, letter, notice, direction, consent, certificate,
statement, or other paper or document believed by it to be genuine and to be
signed, executed, and, where necessary, verified or acknowledged, by the proper
person or persons.

      6.3.  Merger or Consolidation or Change of Name of Warrant Agent. (a) Any
corporation into which the Warrant Agent or any successor Warrant Agent may be
merged or with which it may be consolidated, or any corporation resulting from
any merger or consolidation to which the Warrant Agent or any successor Warrant
Agent is a party, or any corporation succeeding to the corporate trust business
of the Warrant Agent or any successor Warrant Agent, will be the successor to
the Warrant Agent under this Agreement without the execution or filing of any
paper or any further act on the part of any of the parties hereto, provided that
such corporation would be eligible for appointment as a successor Warrant Agent
under the provisions of Section 6.5. In case at the time such successor to the
Warrant Agent shall succeed to the agency created by this Agreement, and in case
at that time any of the Warrant Certificates shall have been countersigned but
not delivered, any such successor to the Warrant Agent may adopt the
countersignature of the original Warrant Agent; and in case at that time any of
the Warrant Certificates shall not have been countersigned, any successor to the
Warrant Agent may countersign such Warrant Certificates either in the name of
the predecessor Warrant Agent or in the name of the successor to the Warrant
Agent; and in all such cases such Warrant Certificates shall have the full force
and effect provided in the Warrant Certificates and in this Agreement.

      (b)   In case at any time the name of the Warrant Agent shall be changed
and at such time any of the Warrant Certificates shall have been countersigned
but not delivered, the Warrant

                                      -12-
<PAGE>

Agent whose name has been changed may adopt the countersignature under its prior
name, and in case at that time any of the Warrant Certificates shall not have
been countersigned, the Warrant Agent may countersign such Warrant Certificates
either in its prior name or in its changed name, and in all such cases such
Warrant Certificates shall have the full force and effect provided in the
Warrant Certificates and in this Agreement.

      6.4.  Duties of Warrant Agent. The Warrant Agent undertakes the duties and
obligations imposed by this Agreement upon the following terms and conditions,
by all of which the Company and the Holders, by their acceptance of Warrant
Certificates, will be bound:

      (a)   The Warrant Agent may consult with legal counsel (who may be legal
counsel for the Company), and the opinion of such counsel will be full and
complete authorization and protection to the Warrant Agent as to any action
taken or omitted by it in good faith and in accordance with such opinion.

      (b)   Whenever in the performance of its duties under this Agreement the
Warrant Agent deems it necessary or desirable that any fact or matter be proved
or established by the Company prior to taking or suffering any action hereunder,
such fact or matter (unless other evidence in respect thereof be herein
specifically prescribed) may be deemed to be conclusively proved and established
by a certificate signed by any one of the Chairman of the Board, the President,
or any Vice President of the Company and delivered to the Warrant Agent; and
such certificate will be full authorization to the Warrant Agent for any action
taken or suffered in good faith by it under the provisions of this Agreement in
reliance upon such certificate.

      (c)   The Warrant Agent's duties will be determined solely by the
provisions hereof. The Warrant Agent will not be liable for anything that it may
do or refrain from doing in connection with this Agreement except for its own
negligence, bad faith, or willful misconduct; provided, however, that the
Warrant Agent shall not be liable for any indirect, special, punitive or
consequential damages.

      (d)   The Warrant Agent will not be liable for or by reason of any of the
statements of fact or recitals contained in this Agreement or in the Warrant
Certificates or be required to verify the same, but all such statements and
recitals are and will be deemed to have been made by the Company only.

      (e)   The Warrant Agent will not be under any responsibility in respect of
the validity of this Agreement or the execution and delivery hereof (except the
due execution and delivery hereof by the Warrant Agent) or in respect of the
validity or execution of any Warrant Certificate (except the due
countersignature thereof by the Warrant Agent); nor will it be responsible for
any breach by the Company of any covenant or condition contained in this
Agreement or in any Warrant Certificate; nor will it be responsible for any
adjustment required under the provisions of Section 4 hereof or responsible for
the manner, method, or amount of any such adjustment or the ascertaining of the
existence of facts that would require any such adjustment (except with respect

                                      -13-
<PAGE>

to the exercise of Warrants evidenced by Warrant Certificates after actual
notice of any such adjustment); nor will it by any act hereunder be deemed to
make any representation or warranty as to the authorization or reservation of
any shares of stock or other securities to be issued pursuant to this Agreement
or any Warrant Certificate or as to whether any shares of stock or other
securities will, when issued, be validly authorized and issued, fully paid, and
nonassessable.

      (f)   The Company will perform, execute, acknowledge, and deliver or cause
to be performed, executed, acknowledged, and delivered all such further and
other acts, instruments, and assurances as may reasonably be required by the
Warrant Agent for the carrying out or performing by the Warrant Agent of the
provisions of this Agreement.

      (g)   The Warrant Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
one of the Chairman of the Board, the President, or any Vice President of the
Company, and to apply to such officers for advice or instructions in connection
with its duties, and it will not be liable for any action taken or suffered to
be taken by it in good faith in accordance with instructions of any such
officer.

      (h)   The Warrant Agent and any stockholder, director, officer, or
employee of the Warrant Agent may buy, sell, or deal in any of the Warrants or
other securities of the Company or become pecuniarily interested in any
transaction in which the Company may be interested, or contract with or lend
money to the Company or otherwise act as fully and freely as though it were not
Warrant Agent under this Agreement. Nothing herein will preclude the Warrant
Agent from acting in any other capacity for the Company or for any other legal
entity.

      (i)   The Warrant Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder either itself or by or
through its attorneys or agents, and the Warrant Agent will not be answerable or
accountable for any act, default, neglect, or misconduct of any such attorneys
or agents or for any loss to the Company resulting from any such act, default,
neglect, or misconduct, provided reasonable care was exercised in the selection
and continued employment thereof. The Warrant Agent will not be under any duty
or responsibility to insure compliance with any applicable federal or state
securities laws in connection with the issuance, transfer, or exchange of
Warrant Certificates.

      6.5.  Change of Warrant Agent. The Warrant Agent or any successor Warrant
Agent may resign and be discharged from its duties under this Agreement upon 30
calendar days' notice in writing mailed to the Company and to each transfer
agent of the Common Stock by registered or certified mail, and to the Holders by
first-class mail. The Company may remove the Warrant Agent or any successor
Warrant Agent upon 30 calendar days' notice in writing, mailed to the Warrant
Agent or successor Warrant Agent, as the case may be, and to each transfer agent
of the Common Stock by registered or certified mail, and to the Holders by
first-class mail. If the Warrant Agent resigns or is removed or otherwise
becomes incapable of acting, the Company will appoint a successor to the Warrant
Agent. If the Company fails to make such appointment within a period of 30
calendar days after giving notice of such removal or after it has been notified
in

                                      -14-
<PAGE>

writing of such resignation or incapacity by the resigning or incapacitated
Warrant Agent or by any Holder (who will, with such notice, submit his Warrant
Certificate for inspection by the Company), then any Holder may apply to any
court of competent jurisdiction for the appointment of a successor Warrant
Agent. Pending appointment of a successor to such Warrant Agent, either by the
Company or by such a court, the duties of the Warrant Agent will be carried out
by the Company. Any successor Warrant Agent, whether appointed by the Company or
by such a court, will be a corporation organized and doing business under the
laws of the United States or of the State of New York (or of any other state of
the United States so long as such corporation is authorized to do business as a
banking institution in the State of New York), in good standing, having a
principal office in the State of New York, which is authorized under such laws
to exercise corporate trust powers and is subject to supervision or examination
by federal or state authority and which has at the time of its appointment as
Warrant Agent a combined capital and surplus of at least $50 million. After
appointment, the successor Warrant Agent will be vested with the same powers,
rights, duties, and responsibilities as if it had been originally named as
Warrant Agent without further act or deed; but the predecessor Warrant Agent
will deliver and transfer to the successor Warrant Agent any property at the
time held by it hereunder, and execute and deliver any further assurance,
conveyance, act, or deed necessary for the purpose. Not later than the effective
date of any such appointment, the Company will file notice thereof in writing
with the predecessor Warrant Agent and each transfer agent of the Common Stock,
and mail by first class mail a notice thereof to each Holder. Failure to give
any notice provided for in this Section 6.5, however, or any defect therein,
will not affect the legality or validity of the resignation or removal of the
Warrant Agent or the appointment of the successor Warrant Agent, as the case may
be.

      7.1   No Rights as a Stockholder; Notices to Holders. Nothing contained in
this Agreement or in the Warrant Certificate will be construed as conferring
upon the Holders or their transferees the right to vote, or to receive
dividends, or to consent or to receive notice as a stockholder in respect of any
meeting of stockholders for the election of directors of the Company or any
other matter, or any rights whatsoever as a stockholder of the Company;
provided, however, that if, at any time prior to the Expiration Date and prior
to the exercise of all of the Warrants, any of the following events occur:

            (a)   The Company declares any dividend payable in any securities
      upon its shares of Common Stock or makes any distribution (other than a
      regular cash dividend payable out of consolidated retained earnings) to
      the holders of its shares of Common Stock;

            (b)   The Company offers to the holders of its Common Stock any
      shares of capital stock of the Company or any Subsidiary or securities
      convertible into or exchangeable for shares of capital stock of the
      Company or any Subsidiary or any option, right, or warrant to subscribe
      for or purchase any thereof;

                                      -15-
<PAGE>

            (c)   The Company distributes to the holders of its Common Stock
      evidences of indebtedness or assets (including any cash dividend which
      would result in an adjustment under Section 4.1) of the Company or any
      Subsidiary;

            (d)   Any reclassification of the Common Stock, any consolidation of
      the Company with or merger of the Company into another corporation, any
      sale, transfer, or lease to another corporation of all or substantially
      all the property of the Company, or any proposal of the Company to effect
      any of the foregoing transactions that has been publicly announced by the
      Company; or

            (e)   Any proposal by the Company to effect a dissolution,
      liquidation, or winding up of the Company that has been publicly announced
      by the Company;

then in any one or more of such events the Company will give notice of such
event to the Holders, as provided in Section 12 hereof, such giving of notice to
be completed at least 10 business days prior to the date fixed as a record date
or the date of closing the transfer books for the determination of the
stockholders entitled to such dividend, distribution, or subscription rights or
at least 20 business days prior to the date fixed as a record date or the date
of closing the transfer books for the determination of stockholders entitled to
vote on such proposed reclassification, consolidation, merger, sale, transfer,
or lease, dissolution, liquidation, or winding up. Such notice will specify such
record date or the date of closing the transfer books, as the case may be, for
such event. Failure to mail or receive such notice or any defect therein or in
the mailing thereof will not affect the validity of any action taken in
connection with such event.

      7.2.  Reports to Holders. The Company will deliver to the Warrant Agent,
within 15 calendar days after it files them with the Securities and Exchange
Commission (the "SEC"), copies of its annual report and of the information,
documents, and other reports (or copies of such portions of any of the foregoing
as the SEC may by rules and regulations prescribe) that the Company is required
to file with the SEC pursuant to Section 13 or 15(d) of the Exchange Act. To the
extent any such information, documents, or other reports are required to be sent
by the Company to the holders of outstanding Common Stock, the Company will
simultaneously send copies thereof to the Holders of Warrants. The Warrant Agent
will provide to any Holder promptly upon request a copy of any document
delivered to the Warrant Agent by the Company pursuant to this Section 7.2.

      7.3.  Agreements Respecting Warrants. The Company will not enter into any
agreement or instrument which would preclude the exercise of the Warrants as
herein provided.

      8.    Agreement of Warrant Holders. Every Holder by accepting a Warrant
Certificate consents and agrees with the Company and the Warrant Agent and with
every other Holder that:

                                      -16-
<PAGE>

      (a)   The Warrant Certificates are transferable only in accordance with
the terms of this Agreement and only on the registry books of the Warrant Agent
if surrendered at the principal office of the Warrant Agent designated for such
purpose, duly endorsed or accompanied by a proper instrument of transfer, and
otherwise in compliance with Section 2;

      (b)   The Company and the Warrant Agent may deem and treat the person in
whose name the Warrant Certificate is registered as the absolute owner thereof
and of the Warrants evidenced thereby (notwithstanding any notations of
ownership or writing on the Warrant Certificate made by anyone other than the
Company or the Warrant Agent) for all purposes whatsoever, and neither the
Company nor the Warrant Agent will be affected by any notice to the contrary;

      (c)   Such Holder expressly waives any right to receive any fractional
Warrants and any fractional securities upon exercise or exchange of a Warrant;
and

      (d)   Notwithstanding anything in this Agreement to the contrary, neither
the Company nor the Warrant Agent will have any liability to any Holder or other
person as a result of its inability to perform any of its obligations under this
Agreement by reason of any preliminary or permanent injunction or other order,
decree, or ruling issued by a court of competent jurisdiction or by a
governmental, regulatory, or administrative agency or commission, or any
statute, rule, regulation, or executive order promulgated or enacted by any
governmental authority, prohibiting or otherwise restraining performance of such
obligation; provided, however, that the Company will use reasonable efforts to
have any such order, decree, or ruling lifted or otherwise overturned as soon as
possible.

      9.    Reservation of Common Stock. The Company will, for so long as
Warrants remain outstanding, reserve and keep available, solely for issuance and
delivery upon the exercise of Warrants, a number of shares of Common Stock (or,
if applicable, other securities) sufficient to provide for the exercise of all
outstanding Warrants. The transfer agent for the Common Stock (or, if
applicable, other securities) will be irrevocably authorized and directed at all
times until the exercise or expiration of the Warrants to reserve such number of
authorized shares of Common Stock (or, if applicable, other securities) as
necessary for such purpose. The Company will keep copies of this Agreement on
file with the transfer agent and will supply the transfer agent with duly
executed stock certificates for such purpose.

      10.   Listing and Registration. (a) The [Warrants and the]1 Warrant Shares
have been listed for trading on the Nasdaq National Market, and the Company will
use its reasonable best efforts to maintain such listing. [In addition, the
Company will use its reasonable best efforts to secure and maintain the listing
of the Warrants on the Nasdaq National Market.](1)

- ----------

(1) The language in this section is bracketed because the language to be
included in the definitive agreement depends upon whether the Warrants will have
been listed as of the date of the definitive agreement.

                                      -17-
<PAGE>

      (b)   The Warrants issued as contemplated by clauses (a) and (b) of the
first sentence of Section 1.1 have been registered for public distribution under
the Securities Act pursuant to a registration statement (No. 333-___________)
filed by the Company with the SEC. The Warrant Shares have been registered for
public distribution upon exercise of the Warrants under the Securities Act
pursuant to registration statement (No. 333-________________) (together with any
amendments thereto, the "Warrant Shares Registration Statement") filed by the
Company with the SEC. Subject to Black Out Periods (as defined below in this
Section 10(b)), the Company will use its reasonable best efforts to keep the
Warrant Shares Registration Statement continuously effective under the
Securities Act until the expiration or exercise of all Warrants in order to
permit the prospectus included therein to be lawfully delivered by the Company
to the Holders exercising such Warrants and by Holders of such Warrants to
prospective purchasers of such Warrants. Notwithstanding the foregoing, the
Company shall not be required to amend or supplement the Warrant Shares
Registration Statement, any related prospectus or any document incorporated
therein by reference for a period (a "Black Out Period"), beginning on the date
the Company gives notice (the "Black Out Notice") to the Warrant Agent and the
Holders that such a period has commenced and ending on the earlier of (i) the
date the information responsible for the Black Out Period is disclosed to the
public and (ii) 60 calendar days after any such Black Out Notice is given, in
the event that (A) an event occurs and is continuing as a result of which the
Warrant Shares Registration Statement, any related prospectus, or any document
incorporated therein by reference as then amended or supplemented would, in the
Company's good faith judgment, contain an untrue statement of a material fact or
omit to state a material fact necessary in order to make the statements therein,
in light of the circumstances under which they were made, not misleading, and
(B) (1) the Company determines in its good faith judgment that the disclosure of
such event at such time would have a material adverse effect on the business,
operations, or prospects of the Company or (2) the disclosure otherwise relates
to a material business transaction, including without limitation any bona fide
financing plan, that has not yet been publicly disclosed; provided, however,
that (x) no Black Out Period may be in effect during the six months immediately
prior to the Expiration Date, (y) there shall be no more than two Black Out
Periods during any period of 180 consecutive calendar days, and (z) there shall
be no more than three Black Out Periods during the term of the Warrants.

      (c)   The Company will cause any amendment or supplement to the Warrant
Shares Registration Statement or the related prospectus, as of the effective
date of the Warrant Shares Registration Statement, amendment, or supplement, (i)
to comply in all material respects with the applicable requirements of the
Securities Act and the rules and regulations of the SEC and (ii) not to contain
any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading.

      (d)   The Company will give prompt written notice to the Warrant Agent and
the Holders of (i) the effectiveness of any post-effective amendment to the
Warrant Shares Registration Statement, (ii) the issuance by the SEC of any stop
order suspending the effectiveness of the Warrant Shares Registration Statement
or the initiation or threatening of any

                                      -18-
<PAGE>

proceedings for that purpose, (iii) the receipt by the Company or its legal
counsel of any notification with respect to the suspension of the qualification
of the Warrant Shares for sale in any jurisdiction or the initiation or
threatening of any proceeding for such purpose, (iv) the happening of any event
that requires the Company to make changes in the Warrant Shares Registration
Statement or the related prospectus in order to make the statements therein not
misleading, and (v) the commencement and termination of any Black Out Period.

      (e)   The Company will use its reasonable best efforts to prevent the
issuance or obtain the withdrawal at the earliest possible time of any order
suspending the effectiveness of the Warrant Shares Registration Statement.

      (f)   Upon the occurrence of any event contemplated by Section 10(d)(iv)
hereof or, if any such event occurs during a Black Out Period, upon the
termination of such Black Out Period, the Company will promptly prepare and file
a post-effective amendment to the Warrant Shares Registration Statement or a
supplement to the related prospectus or file any other required document so
that, as thereafter delivered to Holders of Warrants, such prospectus will not
contain an untrue statement of a material fact or omit to state any material
fact necessary to make the statements therein, in light of the circumstances
under which they were made, not misleading and will contain the current
information required by the Securities Act.

      (g)   The Company will comply with all applicable rules and regulations of
the SEC and will make generally available to its securities holders (or
otherwise provide in accordance with Section 11(a) of the Securities Act) an
earnings statement satisfying the provisions of Section 11(a) of the Securities
Act, no later than 45 days (plus any extension permitted by Rule 12b-25 under
the Exchange Act after the end of a 12-month period (or 90 days, if such period
is a fiscal year (plus any extension permitted by Rule 12b-25 under the Exchange
Act)) beginning with the first month of the Company's first fiscal quarter
commencing after the effective date of the Registration Statement, which
statement shall cover such 12-month period.

      (h)   The Company will register or qualify or cooperate with the Holders
in connection with the registration or qualification of the Warrant Shares for
offer and sale by the Company upon exercise of the Warrants under the securities
or blue sky laws of such state of the United States as any Holder reasonably
requests and do any and all other acts or things necessary or advisable to
enable such offer and sale in such jurisdictions; provided that the Company
shall not be required to (i) qualify to do business in any jurisdiction in which
it is not then so qualified or (ii) take any action which would subject it to
general service of process or to taxation in any jurisdiction in which it is not
then so subject.

      (i)   The Company will bear all expenses incurred by it in connection with
the performance of its obligations under this Section 10.

      (j)   The Company acknowledges and agrees that any remedy at law for
breach of any provision of this Section 10 will be inadequate and that, in
addition to any other remedies that the

                                      -19-
<PAGE>

Holders may have, the Holders will be entitled to the remedy of specific
performance to ensure the Company performs its obligations under this Section
10. The election of any one or more remedies by the Holders hereunder will not
constitute a waiver of the right to pursue other available remedies.

      11.   Representations and Warranties of the Company. The Company hereby
represents and warrants to the Warrant Agent that:

            (a)   The Company is a corporation duly organized, validly existing,
      and in good standing under the laws of the State of Delaware and has all
      requisite corporate power and authority to execute, deliver, and perform
      its obligations hereunder and to consummate the transactions contemplated
      hereby;

            (b)   The execution, delivery, and performance of this Agreement by
      the Company and the consummation by the Company of the transactions
      contemplated hereby have been duly and validly authorized by all necessary
      corporate action on the part of the Company;

            (c)   The execution, delivery, and performance of this Agreement by
      the Company and the consummation by the Company of the transactions
      contemplated hereby in accordance with the terms hereof do not and will
      not conflict with, violate, or constitute a breach of any material
      contract, agreement, or instrument by which the Company is bound or any
      judgment, order, decree, law, statute, rule, regulation, or other judicial
      or governmental restriction to which the Company is subject;

            (d)   This Agreement constitutes the legal, valid, and binding
      obligation of the Company, enforceable against the Company in accordance
      with its terms, except as the enforceability hereof may be limited by
      bankruptcy, insolvency, reorganization, moratorium, or other similar laws
      affecting creditors' rights generally; and

            (e)   The Warrants, when issued and delivered to the initial Holders
      as provided in this Agreement, and the Warrant Shares issued upon exercise
      of the Warrants, when issued, paid for, and delivered as provided in this
      Agreement, will be duly and validly issued and outstanding, fully paid,
      and nonassessable.

      12.   Notices. All notices, requests, waivers, releases, consents, and
other communications required or permitted by this Agreement (collectively,
"Notices") must be in writing. Except as expressly otherwise provided herein
with respect to manner of delivery, notices will be deemed sufficiently given
for all purposes when delivered in person, when dispatched by telegram or
electronic facsimile transmission, when sent by first-class mail, postage
prepaid, or upon confirmation of receipt when dispatched by a nationally
recognized overnight courier service to the appropriate party as follows: (a) if
to a Holder, at the address of such Holder as shown in the registry books
maintained by the Warrant Agent; (b) if to the Company, at The Bank of New

                                      -20-
<PAGE>

York, 601 Barclay Street, 12W, New York, New York 10286, Telecopy No. (___)
___-____ (marked for the attention of the Chief Financial Officer and the
General Counsel), or at such other address as the Company may have furnished to
the Holders and the Warrant Agent in writing; and (c) if to the Warrant Agent,
at _________, ________, ________ _____, Telecopy No. (___) ___- ____ (marked for
the attention of _______________) or at such other address as the Warrant Agent
may have furnished to the Company and the Holders in writing.

      13.   Amendment and Waiver. No failure or delay of the Holder in
exercising any power or right hereunder (other than a failure to exercise
Warrants in accordance with the provisions hereof) will operate as a waiver
thereof, nor will any single or partial exercise of any such right or power, or
any abandonment or discontinuance of steps to enforce such a right or power,
preclude any other or further exercise thereof or the exercise of any other
right or power. No notice or demand on the Company in any case will entitle the
Company to any other or future notice or demand in similar or other
circumstances. Subject to the last sentence of this Section 13, (a) if the
Company so directs, the Company and the Warrant Agent will supplement or amend
this Agreement without the approval of any Holders in order to cure any
ambiguity or correct or supplement any provision contained herein which may be
defective or inconsistent with any other provisions herein, or to make any other
provisions in regard to matters or questions arising hereunder which the Company
and the Warrant Agent may deem necessary or desirable and which shall not in any
way adversely affect the interests of the Holders of Warrants or the Warrant
Agent and (b) the Company and the Warrant Agent may from time to time supplement
or amend this Agreement, with the consent of Holders of at least 50% of the
Warrants then outstanding, for any other purpose. Notwithstanding anything in
this Agreement to the contrary, no supplement or amendment which increases the
Warrant Price, decreases the period of time remaining during which the Warrants
may be exercised, or changes in a manner adverse to Holders the number of
Warrant Shares purchasable upon the exercise of Warrants will be made without
the consent of all Holders. Any such amendment, modification, or waiver effected
pursuant to and in accordance with the provisions of this Section 13 will be
binding upon all Holders and upon each future Holder, the Company, and the
Warrant Agent. In the event of any such amendment, modification, or waiver, the
Company will give prompt notice thereof to all Holders and, if appropriate,
notation thereof will be made on all Warrant Certificates thereafter surrendered
for registration of transfer or exchange.

      14.   Successors and Assigns. This Agreement will be binding upon and
inure to the benefit of the Company, the Warrant Agent, and their respective
successors and assigns, and, subject to Sections 1.4 and 8(b), all Holders.

      15.   Rights of the Parties. Except as provided in Section 14, nothing
expressed or implied in this Agreement is intended or will be construed to
confer upon or give any person or entity other than the Company, the Warrant
Agent, and the Holders any rights or remedies under or by reason of this
Agreement or any transaction contemplated hereby. This Agreement will be for the
sole and exclusive benefit of the Company, the Warrant Agent, and the Holders.
All rights of action in respect of this Agreement are vested in the Holders, and
any Holder without the consent

                                      -21-
<PAGE>

of the Warrant Agent or any other Holder may, on such Holder's own behalf and
for such Holder's own benefit, enforce such Holder's rights hereunder, including
the right to exercise, exchange, or surrender for transfer such Holder's Warrant
Certificates in accordance with the provisions hereof.

      16.   Titles and Headings. Titles and headings to Sections herein are
inserted for convenience of reference only and are not intended to be a part of
or to affect the meaning or interpretation of this Agreement.

      17.   Certain Interpretive Matters and Definitions. Unless the context
otherwise requires, (a) all references to Sections or Exhibits are to Sections
or Exhibits of or to this Agreement, (b) each term defined in this Agreement has
the meaning assigned to it, (c) "or" is disjunctive but not necessarily
exclusive, and (d) words in the singular include the plural and vice versa. All
references to "$" or dollar amounts are to lawful currency of the United States
of America.

      18.   Entire Agreement. This Agreement, together with its Exhibits,
constitutes the entire agreement among the parties hereto with respect to the
subject matter hereof, and there are no agreements among the parties hereto with
respect thereto except as expressly set forth herein.

      19.   Severability. In case any provision contained in this Agreement is
invalid, illegal, or unenforceable, the validity, legality, and enforceability
of the remaining provisions will not in any way be affected or impaired thereby.
The Company and the Warrant Agent will endeavor in good faith to replace the
invalid, illegal, or unenforceable provisions with valid, legal, and enforceable
provisions the economic effect of which comes as close as possible to that of
the invalid, illegal, or unenforceable provisions.

      20.   Governing Law. This Agreement will be governed by and construed in
accordance with the laws of the State of New York, without giving effect to the
principles of conflict of laws thereof.

      21.   Counterparts. This Agreement may be executed in any number of
counterparts, each of which so executed will be deemed to be an original; such
counterparts will together constitute but one agreement.

                                      -22-
<PAGE>

      IN WITNESS WHEREOF, the parties to this Agreement have executed this
Agreement as of the date first above written. 


                                       ARCH COMMUNICATIONS                      
                                       GROUP, INC.
                                       
                                       
                                       
                                       By:                                      
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------
                                       
                                       
                                       THE BANK OF NEW YORK
                                       
                                       
                                       
                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      -23-
<PAGE>

                                    EXHIBIT A
                                    ---------

                           FORM OF WARRANT CERTIFICATE


THE WARRANTS REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO THE TERMS AND
CONDITIONS SET FORTH IN THE WARRANT AGREEMENT (AS HEREINAFTER DEFINED), A COPY
OF WHICH WILL BE MADE AVAILABLE BY THE ISSUER UPON REQUEST. THE TRANSFER OR
EXCHANGE OF THESE WARRANTS MUST BE REGISTERED IN ACCORDANCE WITH THE WARRANT
AGREEMENT.


NO.                                                            WARRANTS
   ----------------                                                    ---------

                      VOID AT 5:00 P.M., NEW YORK CITY TIME
                              ON SEPTEMBER 1, 2001

               Arch Communications Group, Inc. Warrant Certificate


      THIS CERTIFIES THAT for value received, __________, or its registered
assigns (the "Holder"), is the owner of the number of Warrants set forth above
that initially entitle it to purchase from Arch Communications Group, Inc., a
Delaware corporation (the "Company"), at any time and from time to time prior to
5:00 p.m., New York City time, on September 1, 2001 (the "Expiration Date"), a
like number of fully paid and nonassessable shares of the Common Stock, par
value $.01 per share, of the Company (the "Common Stock") at an initial purchase
price of $8.19 per share (the "Warrant Price"), subject to adjustment as
provided in the Warrant Agreement. No Warrant may be exercised at or after 5:00
p.m., New York City time, on the Expiration Date, and to the extent not
exercised by such time, such Warrant shall become void. The shares of Common
Stock purchasable upon exercise of the Warrants are hereinafter referred to as
the "Warrant Shares." On the terms and subject to the conditions set forth in
the Warrant Agreement, the Warrants may be exercised by surrendering to the
Warrant Agent (as hereinafter defined) this Warrant Certificate, with the Form
of Exercise Notice on the reverse side hereof duly executed, together with cash,
a certified or bank cashier's check payable to the order of the Company, or a
wire transfer of immediately available funds to an account designated by the
Warrant Agent, in each case in an amount of lawful currency of the United States
of America equal to the product of (a) the number of Warrant Shares purchasable
upon the exercise of the Warrants designated for exercise in the Form of
Exercise Notice and (b) the Warrant Price.

      The number and kind of Warrant Shares that may be purchased upon exercise
of the Warrants evidenced by this Warrant Certificate are the number as of the
date of the original issue of such Warrants, based on the shares of Common Stock
of the Company as constituted at such

                                      A-1
<PAGE>

date. As provided in the Warrant Agreement, the Warrant Price and the number and
kind of Warrant Shares purchasable upon exercise of the Warrants are subject to
adjustment.

      This Warrant Certificate and the Warrants it represents are subject to,
and entitled to the benefits of, all of the terms, provisions, and conditions of
the Warrant Agreement, dated as of _____________, 199__ (the "Warrant
Agreement"), by and between the Company and The Bank of New York, a _________
corporation (the "Warrant Agent"), which Warrant Agreement is hereby
incorporated herein by reference and made a part hereof and to which Warrant
Agreement reference is hereby made for a full description of the rights,
limitation of rights, obligations, and duties hereunder of the Company and the
Holder. A copy of the Warrant Agreement will be made available to the Holders by
the Company upon request of the Holders.

      Subject to the provisions set forth in the Warrant Agreement or in this
Certificate, this Warrant Certificate, with or without other Warrant
Certificates, may be transferred, split up, combined, or exchanged for another
Warrant Certificate or Warrant Certificates, entitling the Holder to purchase a
like aggregate number of Warrant Shares as the Warrant Certificate or Warrant
Certificates surrendered entitled such Holder (or former Holder in the case of a
transfer) to purchase, upon presentation and surrender hereof at the principal
office of the Warrant Agent designated for such purpose, with the Form of
Assignment (if appropriate) and the related Certificate duly executed.

      The Company will not be required to issue fractional Warrant Shares or
other fractional interests in securities upon the exercise of any Warrants
evidenced by this Warrant Certificate, but in lieu thereof a cash payment will
be made, as provided in the Warrant Agreement.

      Nothing contained in the Warrant Agreement or in this Warrant Certificate
will be construed as conferring upon the Holder of this Warrant Certificate the
right to vote, or to receive dividends, or to consent or (except as provided in
the Warrant Agreement) to receive notice in respect of any meeting of
stockholders for the election of directors of the Company or any other matter,
or any rights whatsoever as a stockholder of the Company.

      This Warrant Certificate will not be valid or obligatory for any purpose
until it has been countersigned by the Warrant Agent. This Warrant Certificate
will be governed and construed in accordance with the laws of the State of New
York.

                                      A-2
<PAGE>

      IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to be
executed on this ____ day of __________, ____, by its corporate officers duly
authorized.


Attest:                                  ARCH COMMUNICATIONS GROUP, INC.



                                         By:
- -----------------------------------         ------------------------------------
[Name, title]                                   [Name, title]


Dated:
      ----------------

Countersigned:

THE BANK OF NEW YORK



By:
   -------------------------------
    [Authorized Signature]
     [Title]

                                      A-3
<PAGE>

                   Form of Reverse Side of Warrant Certificate

                               FORM OF ASSIGNMENT

           (To be executed if the Holder desires to transfer Warrants)

                  FOR VALUE RECEIVED,
                                     -------------------------------------------
hereby sells, assigns, and transfers unto
                                         ---------------------------------------

- --------------------------------------------------------------------------------
                  (Please print name and address of transferee)

- --------------------------------------------------------------------------------
this Warrant Certificate, together with all right, title, and interest therein,
and does hereby irrevocably constitute and appoint Attorney, to transfer the
within Warrant Certificate on the books of the within-named Company, with full
power of substitution.

Dated:
      ---------------------



                                          --------------------------------------
                                          Signature
                                                            

Signature Guaranteed:

                                      A-4
<PAGE>

                             FORM OF EXERCISE NOTICE
                             -----------------------


           (To be executed if the Holder desires to exercise Warrants)


TO ARCH COMMUNICATIONS GROUP, INC.:

      The undersigned hereby irrevocably elects to exercise __________ Warrants
evidenced by this Warrant Certificate to purchase the Warrant Shares issuable
upon the exercise of such Warrants and requests that certificates for such
Warrant Shares be issued in the name of:

- --------------------------------------------------------------------------------
                         (Please print name and address)

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

Please insert social security or 
other identifying number:
                         -------------------------------------------------------

If such number of Warrants is not all the Warrants evidenced by this Warrant
Certificate, a new Warrant Certificate for the balance remaining of such
Warrants will be registered in the name of and delivered to:

- --------------------------------------------------------------------------------
                         (Please print name and address)

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

Please insert social security or 
other identifying number:
                         -------------------------------------------------------

Dated:
      ----------------------

                                          --------------------------------------
                                          Signature

Signature Guaranteed:

                                      A-5
<PAGE>

                                     NOTICE
                                     ------

            Signatures on the foregoing Form of Assignment and Form of Exercise
Notice and in the related Warrant Certificates must correspond to the name as
written upon the face of this Warrant Certificate in every particular, without
alternation or enlargement or any change whatsoever.

            Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.

                                      A-6
<PAGE>

                                                                       EXHIBIT C
                                                                       ---------




                          [Form for Standby Purchasers]

================================================================================






                          REGISTRATION RIGHTS AGREEMENT


                                      among


                         ARCH COMMUNICATIONS GROUP, INC.

                                       and

                                THE OTHER PERSONS
                                SIGNATORY HERETO







                                _________, 199__



================================================================================
<PAGE>

                          REGISTRATION RIGHTS AGREEMENT
                          -----------------------------


      This REGISTRATION RIGHTS AGREEMENT (this "Agreement") is made and entered
into as of __________, 199_ (the "Effective Date"), by and among (i) Arch
Communications Group, Inc. (the "Company"), (ii) W.R. Huff Asset Management Co.,
L.L.C. ("Huff"), (iii) Whippoorwill Associates, Inc. ("Whippoorwill"), (iv)
Credit Suisse First Boston Corporation ("CSFB"), and (v) The Northwestern Mutual
Life Insurance Company, The Northwestern Mutual Life Insurance Company for its
General Annuity Separate Account and Northwestern Mutual Series Fund, Inc. -
High Yield Bond Portfolio (collectively, "Northwestern"). (Huff, Whippoorwill,
CSFB and Northwestern are referred to herein collectively as the
"Stockholders.").

                                    RECITALS
                                    --------

      A.    A plan of reorganization under Chapter 11 of the United States
Bankruptcy Code for MobileMedia Communications, Inc. ("MobileMedia"),
MobileMedia Corporation, the sole stockholder of MobileMedia ("Parent"), and all
of MobileMedia's subsidiaries (the "Plan") was confirmed on _________, 199__ by
order of the United States Bankruptcy Court for the District of Delaware in Case
Nos. 97-174 (PJW) through and including 97-192 (PJW), and has become effective.

      B.    In connection with the Plan, the Company, a wholly owned subsidiary
of the Company ("Merger Sub"), Parent and MobileMedia entered into an Agreement
and Plan of Merger, dated as of August ___, 1998 (the "Merger Agreement"),
pursuant to which MobileMedia has been merged with and into Merger Sub, with
Merger Sub continuing as the surviving corporation and a wholly owned subsidiary
of the Company.

      C.    As a result of the Plan and the Merger Agreement and the
transactions contemplated thereby, each of the Stockholders has become the
Beneficial Owner (as defined below) of (i) shares of Common Stock, par value
$.01 per share, of the Company (the "Common Shares"), [(ii) shares of Class B
Common Stock, par value $.01 per share, of the Company, which shares are
convertible into Common Shares in accordance with their terms (the "Class B
Common Shares")],(1) and (iii) warrants to purchase Common Shares (the
"Warrants"), in each case as indicated on Schedule I hereto.

      D.    In accordance with the Plan and the Merger Agreement, the Company
desires to provide for the registration of the sale by the Stockholders of the
Registrable Securities (as defined below) from time to time, on the terms and
subject to conditions set forth below.

      NOW, THEREFORE, the parties hereto hereby agree as follows:


- ----------

(1) To be included only if Class B Common Shares are actually issued on the
Effective Date.
<PAGE>

                                 I. DEFINITIONS

      1.1.  Definitions. For purposes of this Agreement, the following terms
have the following meanings:

            (a)   Adelphia Agreement: Registration Rights Agreement, dated as of
June 29, 1998, by and among the Company, Adelphia Communications Corporation and
Lisa-Gaye Shearing, as in effect on the date hereof.

            (b)   Advice: As defined in Section 6.3.

            (c)   Affiliate: As defined in Rule 12b-2 under the Exchange Act.

            (d)   Agreement: As defined in the introductory paragraph hereof.

            (e)   Beneficial Owner or Beneficial Ownership: As defined in Rule
13d-3 under the Exchange Act.

            [(f)  Class B Common Shares: As defined in Recital C.](2)

            (g)   Common Shares: As defined in Recital C.

            (h)   Company: As defined in the introductory paragraph hereof.

            (i)   CSFB: As defined in the introductory paragraph hereof.

            (j)   Demand Notice: As defined in Section 3.1.

            (k)   Demand Registration: As defined in Section 3.1.

            (l)   Effective Date: As defined in the introductory paragraph
hereof.

            (m)   Exchange Act: The Securities Exchange Act of 1934, as amended.

            (n)   Huff: As defined in the introductory paragraph hereof.

            (o)   Indemnified Party: As defined in Section 7.3.

            (p)   Indemnifying Party: As defined in Section 7.3.

            (q)   Losses: As defined in Section 7.1.

- --------

(2) To be included only if Class B Common Shares are actually issued on the
Effective Date.

                                      -2-
<PAGE>

            (r)   Merger Agreement: As defined in Recital B.

            (s)   Merger Sub: As defined in Recital B.

            (t)   MobileMedia: As defined in Recital A.

            (u)   NASDAQ: As defined in Section 6.1(l).

            (v)   Northwestern: As defined in the introductory paragraph hereof.

            (w)   Notice: As defined in Section 3.2(d).

            (x)   Other Equity Securities: Any shares of capital stock of the
Company and any other securities issued by the Company in respect of any Owned
Common Shares [or Owned Class B Common Shares].(3)

            (y)   Other Stockholders: As defined in Section 3.2(e).

            [(z)  Owned Class B Common Shares: Class B Common Shares owned by a
Stockholder, whether acquired on or after the Effective Date, including without
limitation those that are acquired by a Stockholder on the Effective Date as
contemplated by the Plan and the Merger Agreement (including without limitation
pursuant to the Standby Purchase Commitment).](3)

            (aa)  Owned Common Shares: Common Shares owned by a Stockholder,
whether acquired before, on or after the Effective Date, including without
limitation those that are acquired by a Stockholder on the Effective Date as
contemplated by the Plan and the Merger Agreement (including without limitation
pursuant to the Standby Purchase Commitment).

            (bb)  Owned Warrants: Warrants owned by a Stockholder, whether
acquired on or after the Effective Date, including without limitation those that
are acquired by a Stockholder on the Effective Date as contemplated by the Plan
and the Merger Agreement (including without limitation pursuant to the Standby
Purchase Commitment).

            (cc)  Permitted Assignee: With respect to any Stockholder, means (i)
an Affiliate of such Stockholder and (ii) any Person who acquires, in a single
transaction, from such Stockholder either (A) Beneficial Ownership of at least
5.0% of the voting power of the Company's outstanding capital stock, calculated
as of immediately after such acquisition, or (B) all of the Common Shares with
respect to which such Stockholder has Beneficial Ownership, even if such Common
Shares constitute less than 5.0% of the voting power of the Company's
outstanding capital stock. 

- ----------

(3) To be included only if Class B Common Shares are actually issued on the
Effective Date.

                                      -3-
<PAGE>

            (dd)  Person (or person): Any individual, corporation, general or
limited partnership, joint venture, trust or other entity or association,
including without limitation any governmental authority.

            (ee)  Piggyback Notice: As defined in Section 4.1.

            (ff)  Piggyback Registration: As defined in Section 4.1.

            (gg)  Plan: As defined in Recital A.

            (hh)  Prospectus: The prospectus included in any Registration
Statement (including without limitation a prospectus that discloses information
previously omitted from a prospectus filed as part of an effective registration
statement in reliance upon Rule 430A promulgated under the Securities Act), as
amended or supplemented by any prospectus supplement, all other amendments and
supplements to such prospectus (including post-effective amendments), and all
exhibits and all material incorporated by reference or deemed to be incorporated
by reference in such prospectus.

            (ii)  Registrable Securities: The Owned Common Shares, [the Owned
Class B Common Shares, the Common Shares issuable upon conversion of the Owned
Class B Common Shares,](4) the Owned Warrants, the Common Shares issuable upon
exercise of the Owned Warrants and the Other Equity Securities; provided,
however, that as to any Registrable Securities, such securities will cease to
constitute "Registrable Securities" for purposes of this Agreement if and when
(i) a Registration Statement with respect to the sale of such securities has
been declared effective by the Commission and such securities have been sold
pursuant thereto in accordance with the intended plan and method of distribution
therefor set forth in the final Prospectus forming part of such Registration
Statement, (ii) such securities have been sold in satisfaction of all applicable
resale provisions of Rule 144 under the Securities Act, (iii) such securities
have been transferred to any person or entity other than a Permitted Assignee,
or (iv) such securities may be freely sold publicly without either (A)
registration under the Securities Act or (B) compliance with any restrictions
(including without limitation restrictions as to volume or manner of sale) under
Rule 144 of the Securities Act.

            (jj)  Registration Expenses: As defined in Section 6.4.

            (kk)  Registration Statement: Any registration statement of the
Company under the Securities Act (including the Shelf Registration Statement)
that covers any of the Registrable Securities pursuant to the provisions of this
Agreement, including the related Prospectus, all amendments and supplements to
such registration statement (including post-effective amendments), and all
exhibits and all material incorporated by reference or deemed to be incorporated
by reference in such registration statement. 

- ----------

(4) To be included only if Class B Common Shares are actually issued on the
Effective Date.

                                      -4-
<PAGE>

            (ll)  Rule 144: Rule 144 promulgated under the Securities Act, as
such Rule may be amended from time to time, or any similar rule or regulation
hereafter adopted by the SEC.

            (mm)  SEC: The Securities and Exchange Commission.

            (nn)  Securities Act: The Securities Act of 1933, as amended.

            (oo)  Shelf Registration Statement: As defined in Section 2.1.

            (pp)  Stockholder: As defined in the introductory paragraph hereof.
For all purposes hereof, the persons comprising Northwestern will be treated as
a single Stockholder and will be required to act jointly to exercise their
rights hereunder (with persons holding at least 85% of the aggregate number of
Registerable Securities then held by all such persons to control with respect to
any such exercise).

            (qq)  Underwritten Registration or Underwritten Offering: A
registration in which securities of the Company are sold to an underwriter for
reoffering to the public.

            (rr)  Warrants: As defined in Recital C.

            (ss)  Whippoorwill: As defined in the introductory paragraph hereof.

                             II. SHELF REGISTRATION

      2.1.  General. On or before the date of this Agreement, there has become
effective under the Securities Act a Registration Statement (No. 333-________)
relating to the resale, from time to time, of the Registrable Securities owned
by the Stockholders as of the Effective Date in accordance with the plan and
method of distribution set forth in the Prospectus included in such Registration
Statement (the "Shelf Registration Statement").

      2.2.  Effective Period. Subject to Section 5.1, the Company will use its
reasonable best efforts to keep the Shelf Registration Statement continuously
effective until the earliest of (a) March 1, 2003 (subject to extension as
provided in Section 5.1 and Section 6.3), (b) the date on which all Registrable
Securities covered by the Shelf Registration Statement have been sold thereunder
in accordance with the plan and method of distribution intended by the
Stockholders and disclosed in the Prospectus included in the Shelf Registration
Statement, and (c) the date on which all Registrable Securities covered by the
Shelf Registration Statement have otherwise ceased to be Registrable Securities.

                                      -5-
<PAGE>

                            III. DEMAND REGISTRATION

      3.1.  Demand Registration. (a) At any time and from time to time, each
Stockholder will have the right by written notice delivered to the Company (a
"Demand Notice") to require the Company to register (a "Demand Registration"),
in accordance with the provisions of the Securities Act, all or any portion of
such Stockholder's Registrable Securities; provided, however, that (i) no Demand
Notice may be given prior to 90 days after the effective date of the immediately
preceding Demand Registration and (ii) no Demand Notice may be given unless
Registrable Securities having an aggregate offering price of at least $1.0
million are to be offered pursuant to such Demand Registration.

            (b)   The number of Demand Registrations pursuant to this Section
3.1 will not exceed two for Huff (including its Permitted Assignees), two for
Whippoorwill (including its Permitted Assignees), two for CSFB (including its
Permitted Assignees), and two for Northwestern (including its Permitted
Assignees); provided, however, that in determining the number of Demand
Registrations to which a Stockholder is entitled, there will be excluded any
Demand Registration in which any Registrable Securities requested by a
Stockholder to be registered under this Article III are excluded from such
Demand Registration pursuant to Section 3.3 hereof.

            (c)   Notwithstanding anything to the contrary herein contained, (i)
the Company will not be required to effect any Demand Registration pursuant to
any Registration Statement other than the Shelf Registration Statement at any
time when the Shelf Registration Statement is effective and may be used for the
offering or sale proposed to be effected pursuant to such Demand Registration
and (ii) the Company will not be required to effect any Demand Registration of
an offering or sale that can otherwise be effected in compliance with Rule 144.

            (d)   Notwithstanding anything to the contrary herein contained, a
registration will not count as a Demand Registration until it has become
effective (unless the requesting Stockholder withdraws from such registration
all its Registrable Securities and the Company has performed its obligations
hereunder (including without limitation under Section 3.2(c)) in all material
respects, in which case such registration will count as a Demand Registration
unless the requesting Stockholder pays all of the Registration Expenses in
connection with such withdrawn registration); provided that, if, after it has
become effective but prior to the distribution of all of the Registrable
Securities covered thereby, (i) the offering of Registrable Securities pursuant
to such registration is terminated by any stop order, injunction or other order
of the SEC or other governmental agency or court or (ii) such registration
otherwise is not maintained effective for the period required pursuant to
Section 3.2 hereof, such registration will be deemed not to have been effected
and will not count as a Demand Registration.

      3.2.  Filing and Effectiveness. (a) The Company will file a Registration
Statement relating to any Demand Registration as soon as practicable (but no
later than 60 calendar days after the date on which the Company receives from
the Stockholder the Demand Notice relating

                                      -6-
<PAGE>

to such Demand Registration) and will use its best efforts to cause the same to
be declared effective by the SEC as soon as practicable (but no later than 120
calendar days after such date).

            (b)   All requests made pursuant to Section 3.1(a) will specify (i)
the number of Registrable Securities to be registered and (ii) the intended
method or methods of disposition thereof. Any offering of Registrable Securities
pursuant to a Demand Registration will be in the form of an Underwritten
Offering or such other lawful form as the Stockholder delivering the Demand
Notice may reasonably specify.

            (c)   The Company will use its reasonable best efforts to keep the
Registration Statement relating to any Demand Registration continuously
effective until the earliest of (i) the date on which all Registrable Securities
covered by such Registration Statement have been sold thereunder in accordance
with the plan and method of distribution disclosed in the Prospectus included on
such Registration Statement, (ii) the date on which all Registrable Securities
covered by such Registration Statement have otherwise ceased to be Registrable
Securities, and (iii) (x) in the case of an Underwritten Offering, 90 days from
the effective date of such Registration Statement or (y) in the case of an
offering that is not an Underwritten Offering, 180 days from the date of such
Registration Statement.

            (d)   Within 10 business days after receipt of a Demand Notice, the
Company will send written notice thereof (the "Notice") to each Stockholder
(other than the Stockholder that delivered the Demand Notice). Subject to
Section 3.3 hereof, the Company will include in such registration all
Registrable Securities with respect to which the Company has received a written
request for inclusion therein within 10 business days after the receipt of the
Notice by any such other Stockholder.

            (e)   With respect to any Demand Registration, the Company may also
provide written notice to holders of its equity securities other than the
Stockholders who at the time have piggyback registration rights with respect
thereto ("Other Stockholders"), and will, subject to Section 3.3 hereof, permit
all such Other Stockholders who request to be included in the Demand
Registration to include any or all of their equity securities in such Demand
Registration on the same terms and conditions as the Registrable Securities.

      3.3.  Priority on Demand Registration. With respect to any Demand
Registration, if the managing underwriter or underwriters of such Underwritten
Offering advise the Company and the selling Stockholder or Stockholders that the
total amount of Registrable Securities and equity securities of Other
Stockholders who have piggyback registration rights and who request to be
included in such Demand Registration as contemplated by Section 3.2(e) hereof
will in the aggregate materially and adversely affect the success of such
Underwritten Offering, then (subject to the rights of Other Stockholders having
rights under the Adelphia Agreement): (i) first, the amount of equity securities
of such Other Stockholders will be reduced to zero if necessary (pro rata among
such Other Stockholders on the basis of the amount of such equity securities
requested to be included therein by each such holder) and (ii) second, the
amount of Registrable

                                      -7-
<PAGE>

Securities of all Stockholders who have requested to have Registrable Securities
included in the Demand Registration will be reduced (pro rata among such
Stockholders on the basis of the amount of such Registrable Securities requested
to be included therein by each such Stockholder) so that, after such reduction,
there will be included in such Underwritten Offering the amount of securities
that, in the opinion of such managing underwriter or underwriters, can be sold
without materially and adversely affecting the success of such Underwritten
Offering.

      3.4.  Postponement of Demand Registration. The Company will be entitled to
postpone by written notice to the Stockholders the filing period (or suspend the
effectiveness) of any Demand Registration for a reasonable period of time not in
excess of 90 calendar days, if the Board of Directors of the Company determines,
in the good faith exercise of its reasonable business judgment, that such
registration would (i) materially interfere with bona fide financing plans of
the Company or (ii) require disclosure of information not otherwise required to
be disclosed, the disclosure of which could materially and adversely affect the
Company; provided, however, that the Company will not be entitled to exercise
its rights under this Section 3.4 more than twice in any 360-day period. If the
Company postpones the filing of a Registration Statement, it will promptly
notify the selling Stockholder or Stockholders in writing when the events or
circumstances permitting such postponement have ended.

      3.5.  Registration of Securities Other than Registrable Securities.
Without the written consent of each Stockholder that then holds Registrable
Securities, the Company will not after the date hereof grant to any person the
right to require the Company to register, in accordance with the provisions of
the Securities Act, any securities of the Company, unless the rights so granted,
if exercised, would not violate the provisions of this Agreement.

                           IV. PIGGYBACK REGISTRATION

      4.1.  Right to Piggyback. If at any time the Company proposes to file a
registration statement under the Securities Act with respect to an offering of
any class of equity securities (other than a registration statement (i) on Form
S-4, S-8 or any successor form thereto or (ii) filed solely in connection with
an offering made solely to employees of the Company), whether or not for its own
account, then the Company will give written notice (the "Piggyback Notice") of
such proposed filing to the Stockholders at least 30 calendar days before the
anticipated filing date. Such notice will offer the Stockholders the opportunity
to register such amount of Registrable Securities as each Stockholder may
request (a "Piggyback Registration"). Subject to Section 4.2 hereof, the Company
will include in each such Piggyback Registration all Registrable Securities with
respect to which the Company has received written requests for inclusion therein
within 15 calendar days after the receipt of the Piggyback Notice. The
Stockholders will be permitted to withdraw all or part of the Registrable
Securities from a Piggyback Registration at any time prior to the third calendar
day immediately preceding the effective date of such Piggyback Registration.

      4.2.  Priority on Piggyback Registrations. The Company will cause the
managing underwriter or underwriters of a proposed Underwritten Offering to
permit the Stockholders that

                                      -8-
<PAGE>

have requested Registrable Securities to be included in the Piggyback
Registration for such offering to include all such Registrable Securities on the
same terms and conditions as any similar securities, if any, of the Company
included therein. Notwithstanding the foregoing, if the managing underwriter or
underwriters of such Underwritten Offering advises the Company and the selling
Stockholder or Stockholders that the total amount of securities that the
Company, such Stockholders and any other persons having rights to participate in
such Piggyback Registration propose to include in such offering is such as to
materially and adversely affect the success of such Underwritten Offering, then
(subject to the rights of Other Stockholders having rights under the Adelphia
Agreement):

            (a)   if such Piggyback Registration is a primary registration by
the Company for its own account, the Company will include in such Piggyback
Registration: (i) first, all securities to be offered by the Company and (ii)
second, up to the full amount of securities requested to be included in such
Piggyback Registration by the Stockholders and Other Stockholders having rights
to participate in such Piggyback Registration (allocated pro rata among such
Stockholders and Other Stockholders on the basis of the amount of securities
requested to be included therein by each such Stockholder or Other Stockholder)
so that the total amount of securities to be included in such Underwritten
Offering is the full amount that, in the opinion of such managing underwriter or
underwriters, can be sold without materially and adversely affecting the success
of such Underwritten Offering; and

            (b)   if such Piggyback Registration is an underwritten secondary
registration for the account of holders of securities of the Company other than
the Stockholders, the Company will include in such registration: (i) first, all
securities of the persons exercising "demand" registration rights requested to
be included therein (including without limitation the person who demands
registration and any persons who are entitled to participate in such Piggyback
Registration pursuant to the same agreement as the person demanding such
Piggyback Registration) and (ii) second, up to the full amount of securities
requested to be included in such Piggyback Registration by the Stockholders and
Other Stockholders having rights to participate in such Piggyback Registration
(allocated pro rata among such Stockholders and Other Stockholders on the basis
of the amount of securities requested to be included therein by each such
Stockholder or Other Stockholder) so that the total amount of securities to be
included in such Underwritten Offering is the full amount that, in the written
opinion of such managing underwriter or underwriters, can be sold without
materially and adversely affecting the success of such Underwritten Offering.

                             V. RESTRICTIONS ON SALE

      5.1.  Restrictions on Sale by Stockholders. Each Stockholder whose
Registrable Securities are covered by a Registration Statement filed pursuant to
Article II, Article III or Article IV hereof agrees that, if such Stockholder is
so requested (pursuant to a timely written notice) by the managing underwriter
or underwriters in any Underwritten Offering by the Company for its own account,
not to effect any public or private sale or distribution of any

                                      -9-
<PAGE>

Registrable Securities (except as part of such Underwritten Offering), including
a sale pursuant to Rule 144, during the 10 calendar day period prior to, and
during the 90 calendar day period beginning on, the closing date of such
Underwritten Offering; provided, however, that the foregoing shall not apply to
any Stockholder that is the Beneficial Owner of less than 4.0% of the
outstanding Common Shares. If a request is made pursuant to this Article V, the
time period during which the Shelf Registration Statement is required to remain
continuously effective pursuant to Section 2.2 will be extended by 100 calendar
days or such shorter period that will terminate when all Registrable Securities
included therein have been sold thereunder in accordance with the plan and
method of distribution intended by the Stockholders and disclosed in the
Prospectus included therein or all Registrable Securities covered by the Shelf
Registration Statement have otherwise ceased to be Registrable Securities. In
the event of such a request, the Company may impose, during such period,
appropriate stop-transfer instructions with respect to the Registrable
Securities subject to such restrictions.

      5.2.  Restrictions on Sale by the Company and Others. The Company, if so
requested (pursuant to a timely written notice) by the managing underwriter or
underwriters in any Underwritten Offering pursuant to a Demand Registration,
will not effect any registration of its equity securities (other than a
registration statement on Form S-4, S-8 or any successor forms thereto), or
effect any public or private sale or distribution of any of its securities
(other than in connection with a business combination or acquisition transaction
in which the recipients of its equity securities agree to a restriction no less
restrictive than those contained in this Section 5.2), including a sale pursuant
to Regulation D under the Securities Act, whether on its own behalf or at the
request of any holder or holders of its equity securities (other than pursuant
to and in accordance with this Agreement), from the date of a request to
register Registrable Securities pursuant to and in accordance with Article III
hereof in connection with such Underwritten Offering until 90 days after the
effective date of such Demand Registration. The Company will cause each holder
of its equity securities acquired from the Company at any time on or after the
date of this Agreement other than in a registered public offering or pursuant to
the Plan or the Merger Agreement (provided such acquisition involves an amount
of securities equal to at least 1% of such class of securities) to agree not to
effect any public or private sale or distribution of any such securities during
such period, including a sale pursuant to Rule 144.

                           VI. PROCEDURES AND EXPENSES

      6.1.  Registration Procedures. In connection with the Company's
registration obligations pursuant to Article II, Article III and Article IV
hereof, the Company will effect such registrations to permit the sale of
Registrable Securities by a Stockholder in accordance with the intended method
or methods of disposition thereof, and pursuant thereto the Company will as
promptly as reasonably practicable:

            (a)   Prepare and file with the SEC a Registration Statement or
Registration Statements on an appropriate form under the Securities Act
available for the sale of the Registrable Securities by the selling Stockholder
in accordance with the intended method or

                                      -10-
<PAGE>

methods of distribution thereof; provided, however, that the Company (i) will,
before filing, furnish to the selling Stockholder, its counsel and the managing
underwriter or underwriters, if any, copies of the Registration Statement or
Prospectus proposed to be filed, which documents will be subject to the review
of such Stockholder, its counsel and such underwriters, (ii) will provide such
Persons with a reasonable opportunity to review and comment on such Registration
Statement or Prospectus, and (iii) will not file any such Registration Statement
or Prospectus to which the selling Stockholder, its counsel or such underwriter,
if any, shall reasonably object within three business days after the receipt
thereof.

            (b)   Prepare and file with the SEC such amendments and
post-effective amendments to each Registration Statement as may be necessary to
keep such Registration Statement continuously effective for the applicable
period specified in Section 2.2 or Section 3.2; cause the related Prospectus to
be supplemented by any required Prospectus supplement, and as so supplemented to
be filed pursuant to Rule 424 (or any similar provision then in force) under the
Securities Act; and comply with the provisions of the Securities Act with
respect to the disposition of all securities covered by such Registration
Statement during the applicable period in accordance with the intended methods
of disposition by the selling Stockholder set forth in such Registration
Statement as so amended, or in such Prospectus as so supplemented.

            (c)   Promptly notify the selling Stockholder, its counsel and the
managing underwriter or underwriters, if any, orally (with subsequent written
confirmation) (i) when a Prospectus or any Prospectus supplement or
post-effective amendment has been filed, and, with respect to a Registration
Statement or any post-effective amendment, when the same has become effective,
(ii) of any request by the SEC or any other federal or state governmental
authority for amendments or supplements to a Registration Statement or related
Prospectus or for additional information, (iii) of the issuance by the SEC or
any other federal or state governmental authority of any stop order suspending
the effectiveness of a Registration Statement or the initiation of any
proceedings for that purpose, (iv) of the receipt by the Company of any
notification with respect to the suspension of the qualification or exemption
from qualification of any of the Registrable Securities for sale in any
jurisdiction or the initiation or threatening of any proceeding for such
purpose, (v) of the occurrence of any event which makes any statement made in
such Registration Statement or Prospectus untrue in any material respect or
which requires the making of any changes in a Registration Statement or
Prospectus or other documents so that, (A) in the case of the Registration
Statement, it will not contain any untrue statement of a material fact or omit
to state any material fact required to be stated therein or necessary to make
the statements therein not misleading and (B) in the case of the Prospectus, it
will not contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading, and (vi) of the Company's reasonable determination that a
post-effective amendment to a Registration Statement would be appropriate.

            (d)   Use its best efforts to obtain the withdrawal of any order
suspending the effectiveness of a Registration Statement, or the lifting of any
suspension of the qualification or

                                      -11-
<PAGE>

exemption from qualification of any of the Registrable Securities for sale in
any jurisdiction, at the earliest practicable date.

            (e)   If requested by the managing underwriter or underwriters, if
any, or the selling Stockholder, (i) promptly incorporate in a Prospectus
supplement or post-effective amendment such information as the managing
underwriter or underwriters, if any, and such selling Stockholder agree should
be included therein under applicable law and (ii) make all required filings of
such Prospectus supplement or such post-effective amendment as soon as
practicable after the Company has received notification of the matters to be
incorporated in such Prospectus supplement or post-effective amendment;
provided, however, that the Company will not be required to take any actions
under this Section 6.1(e) that are not, in the opinion of counsel for the
Company, in compliance with applicable law.

            (f)   Furnish to the selling Stockholder, its counsel and each
managing underwriter, if any, at least one conformed copy of the Registration
Statement and any post-effective amendment thereto, including financial
statements (but excluding schedules, all documents incorporated or deemed
incorporated therein by reference and all exhibits).

            (g)   Deliver to the selling Stockholder, its counsel and the
underwriter or underwriters, if any, as many copies of the Prospectus relating
to such Registrable Securities (including each preliminary Prospectus) and any
amendment or supplement thereto as such persons may reasonably request and, by
such delivery, the Company will be deemed to have consented to the use of such
Prospectus or such amendment or supplement thereto by the selling Stockholder
and the underwriter or underwriters, if any, in connection with the offering and
sale of the Registrable Securities covered by such Prospectus or any amendment
or supplement thereto.

            (h)   Prior to any public offering of Registrable Securities, to
register or qualify, or cooperate with the selling Stockholder, the underwriter
or underwriters, if any, and their respective counsel in connection with the
registration or qualification (or exemption from such registration or
qualification) of, such Registrable Securities for offer and sale under the
securities or blue sky laws of such jurisdictions within the United States as
the selling Stockholder or underwriter or underwriters reasonably request in
writing; keep each such registration or qualification (or exemption therefrom)
effective during the period such Registration Statement is required to be kept
effective and do any and all other acts or things reasonably necessary or
advisable to enable the disposition in such jurisdictions of the Registrable
Securities covered by the Registration Statement; provided, however, that the
Company will not be required to (i) qualify generally to do business in any
jurisdiction in which it is not then so qualified or (ii) take any action that
would subject it to general service of process in any jurisdiction in which it
is not then so subject.

            (i)   Cooperate with the selling Stockholder and the managing
underwriter or underwriters, if any, to facilitate the timely preparation and
delivery of certificates representing

                                      -12-
<PAGE>

Registrable Securities to be sold, which certificates will not bear any
restrictive legends; and cause such certificates to be in such denominations and
registered in such names as the managing underwriters, if any, shall request at
least two business days prior to any sale of Registrable Securities to the
underwriters.

            (j)   Cause the Registrable Securities covered by the applicable
Registration Statement to be registered with or approved by such other
governmental agencies or authorities within the United States, including such as
may be required solely as a consequence of the nature of the selling
Stockholder's business.

            (k)   As promptly as practicable upon the occurrence of any event
contemplated by Section 6.1(c)(v) or 6.1(c)(vi) hereof, prepare a supplement or
post-effective amendment to each Registration Statement or a supplement to the
related Prospectus, or file any other required document so that, as thereafter
delivered to the purchasers of the Registrable Securities being sold thereunder,
such Prospectus will not contain an untrue statement of a material fact or omit
to state any material fact required to be stated therein or necessary to make
the statements therein, in light of the circumstances under which they were
made, not misleading.

            (l)   Use its best efforts to cause all Registrable Securities
covered by such Registration Statement to be (i) listed on each securities
exchange, if any, on which similar securities issued by the Company are then
listed or (ii) authorized to be quoted on The Nasdaq Stock Market ("NASDAQ") and
on the Nasdaq National Market of NASDAQ if the securities qualify to be so
quoted; in each case, if requested by the selling Stockholder or the managing
underwriter or underwriters, if any.

            (m)   Prior to the effective date of the first Demand Registration,
(i) engage an appropriate transfer agent and provide such transfer agent with
printed certificates for the Registrable Securities in a form eligible for
deposit with The Depository Trust Company and (ii) provide a CUSIP number for
the Registrable Securities.

            (n)   Enter into such agreements (including, in the event of an
Underwritten Offering, an underwriting agreement in form, scope and substance as
is customary in Underwritten Offerings) and take all such other actions in
connection therewith (including those reasonably requested by the selling
Stockholder or, in the event of an Underwritten Offering, those reasonably
requested by the managing underwriter or underwriters) reasonably necessary or
desirable to expedite or facilitate the disposition of such Registrable
Securities, and in such connection, whether or not an underwriting agreement is
entered into and whether or not the registration is an Underwritten
Registration, (i) make such representations and warranties to the selling
Stockholder and the underwriter or underwriters, if any, with respect to the
business of the Company and its subsidiaries, the Registration Statement or
Prospectus, in each case, in form, substance and scope as are customarily made
by issuers to underwriters in Underwritten Offerings and confirm the same if and
when requested, (ii) obtain opinions of counsel to the Company and updates
thereof (which counsel and opinions (in form, scope and substance) shall be
reasonably

                                      -13-
<PAGE>

satisfactory to the managing underwriter or underwriters, if any, and the
selling Stockholder) addressed to the selling Stockholder and the underwriter or
underwriters, if any, covering the matters customarily covered in opinions
requested in Underwritten Offerings and such other matters as may be reasonably
requested by the selling Stockholder and underwriter or underwriters, if any,
including without limitation the matters referred to in Section 6.1(n)(i)
hereof, (iii) use its best efforts to obtain "comfort" letters and updates
thereof from the independent certified public accountants of the Company (and,
if necessary, any other certified public accountants of any subsidiary of the
Company or of any business acquired by the Company for which financial
statements and financial data is, or is required to be, included in the
Registration Statement), addressed to the selling Stockholder and each of the
underwriter or underwriters, if any, such letters to be in customary form and
covering matters of the type customarily covered in "comfort" letters in
connection with Underwritten Offerings, and (iv) deliver such documents and
certificates as may be reasonably requested by the selling Stockholder, its
counsel or the managing underwriter or underwriters, if any, to evidence the
continued validity of the representations and warranties of the Company and its
subsidiaries made pursuant to clause (i) above and to evidence compliance with
any customary conditions contained in the underwriting agreement or similar
agreement entered into by the Company. The foregoing actions will be taken in
connection with each closing under such underwriting or similar agreement as and
to the extent required thereunder.

            (o)   Make available for inspection by a representative of the
selling Stockholder, any underwriter, and any attorney or accountant retained by
such selling Stockholder or underwriter, all financial and other records,
pertinent corporate documents and properties of the Company and its
subsidiaries, and cause the officers, directors and employees of the Company and
its subsidiaries to supply all information reasonably requested by any such
representative, underwriter, attorney or accountant in connection with such
Registration Statement; provided, however, that any records, information or
documents that are designated by the Company in writing as confidential at the
time of delivery of such records, information or documents will be kept
confidential by such persons unless (i) such records, information or documents
are in the public domain or otherwise publicly available (other than by reason
of breach of this confidentiality provision), (ii) disclosure of such records,
information or documents is required by court or administrative order or is
necessary to respond to inquires of regulatory authorities, or (iii) disclosure
of such records, information or documents, in the opinion of counsel to such
person, is otherwise required by law or regulation (including without limitation
pursuant to the requirements of the Securities Act or regulations promulgated
thereunder); provided, however, that, in the case of subsections (ii) and (iii)
hereof, prior to making such disclosure the Stockholder will advise and consult
with the Company and its counsel as to such disclosure and the nature and
wording of such disclosure and will use its reasonable best efforts to obtain
confidential treatment therefor.

            (p)   Comply with all applicable rules and regulations of the SEC
and make generally available to its security holders earning statements
satisfying the provisions of Section 11(a) of the Securities Act and Rule 158
thereunder (or any similar rule promulgated

                                      -14-
<PAGE>

under the Securities Act) no later than 45 calendar days after the end of any
12-month period (or 90 calendar days after the end of any 12-month period if
such period is a fiscal year) (i) commencing at the end of any fiscal quarter in
which Registrable Securities are sold to underwriters in a firm commitment or
best efforts Underwritten Offering and (ii) if not sold to underwriters in such
an offering, commencing on the first day of the first fiscal quarter of the
Company, after the effective date of a Registration Statement, which statements
shall cover such 12-month period.

      6.2.  Information from Stockholder. (a) The Company may require each
selling Stockholder that has requested inclusion of its Registrable Securities
in any Registration Statement to furnish to the Company such information
regarding the Stockholder and its plan and method of distribution of such
Registrable Securities as the Company may, from time to time, reasonably request
in writing. The Company may refuse to proceed with the registration of such
selling Stockholder's Registrable Securities if such selling Stockholder
unreasonably fails to furnish such information within a reasonable time after
receiving such request.

            (b)   Each selling Stockholder will as expeditiously as possible (i)
notify the Company of the occurrence of any event that makes any statement made
in a Registration Statement or Prospectus regarding such selling Stockholder
untrue in any material respect or that requires the making of any changes in a
Registration Statement or Prospectus so that, in such regard, (A) in the case of
a Registration Statement, it will not contain any untrue statement of a material
fact or omit to state any material fact required to be stated therein or
necessary to make the statements therein not misleading and (B) in the case of a
Prospectus, it will not contain any untrue statement of a material fact or omit
to state any material fact required to be stated therein or necessary to make
the statements therein, in light of the circumstances under which they were
made, not misleading and (ii) provide the Company with such information as may
be required to enable the Company to prepare a supplement or post-effective
amendment to any such Registration Statement or a supplement to such Prospectus
as contemplated by Section 6.1(k).

            (c)   With respect to any Registration Statement for an Underwritten
Offering, the inclusion of a Stockholder's Registrable Securities therein will
be conditioned upon such Stockholder's participation in such Underwritten
Offering and the execution and delivery by such Stockholder of an underwriting
agreement in form, scope and substance as is customary in Underwritten
Offerings.

      6.3.  Suspension of Disposition. Each selling Stockholder will be deemed
to have agreed that, upon receipt of any notice from the Company of the
occurrence of any event of the kind described in Section 6.1(c)(ii),
6.1(c)(iii), 6.1(c)(iv), 6.1(c)(v) or 6.1(c)(vi) hereof, such Stockholder will
discontinue disposition of Registrable Securities covered by a Registration
Statement or Prospectus until such Stockholder's receipt of the copies of the
supplemented or amended Prospectus contemplated by Section 6.1(k) hereof or
until it is advised in writing (the "Advice") by the Company that the use of the
applicable Prospectus may be resumed and has received copies of any additional
or supplemental filings that are incorporated or deemed to be

                                      -15-
<PAGE>

incorporated by reference in such Prospectus. In the event the Company shall
give any such notice, the time period prescribed in Section 3.2(c) hereof will
be extended by the number of days during the time period from the date of the
giving of such notice to the date when such selling Stockholder shall have
received (x) the copies of the supplemented or amended Prospectus contemplated
by Section 6.1(k) hereof or (y) the Advice and any such additional or
supplemental filings referred to above.

      6.4.  Registration Expenses. (a) All fees and expenses incurred by the
Company in complying with Articles II, III, IV and VI hereof ("Registration
Expenses") will be borne by the Company. Such fees and expenses will include,
without limitation, (i) all registration and filing fees (including without
limitation fees and expenses (x) with respect to filings required to be made
with the National Association of Securities Dealers, Inc. and (y) of compliance
with securities or blue sky laws (including without limitation reasonable fees
and disbursements of counsel for the underwriters and selling Stockholder in
connection with blue sky qualifications of the Registrable Securities and
determination of the eligibility of the Registrable Securities for investment
under the laws of such jurisdictions as the managing underwriter or
underwriters, if any, or the Selling Stockholder may designate)), (ii) printing
expenses (including without limitation the expenses of printing certificates for
securities in a form eligible for deposit with The Depository Trust Company and
of printing prospectuses if the printing of prospectuses is requested by the
selling Stockholder), (iii) messenger, telephone and delivery expenses, (iv)
reasonable fees and disbursements of counsel for the Company, (v) reasonable
fees and disbursements of one counsel for all selling Stockholders collectively
(which counsel, in the case of a Demand Registration, will be selected by the
Stockholder that delivers the Demand Notice relating to the Registration
Statement for which Registration Expenses are being incurred and, in all other
cases, will be selected by Stockholders holding a majority of the Registrable
Securities sought to be included in the Registration Statement), (vi) reasonable
fees and disbursements of all independent certified public accountants referred
to in Section 6.1(n)(iii) hereof (including the expenses of any special audit
and "comfort" letters required by or incident to such performance), (vii)
reasonable fees and expenses of any "qualified independent underwriter" or other
independent appraiser participating in an offering pursuant to Section 2720(c)
of the Conduct Rules of the National Association of Securities Dealers, Inc.,
and (viii) reasonable fees and expenses of all other persons retained by the
Company. In addition, the Company will pay its internal expenses (including
without limitation all salaries and expenses of its officers and employees
performing legal or accounting duties), the expense of any annual audit, and the
fees and expenses incurred in connection with the listing of the securities to
be registered on each securities exchange, if any, on which similar securities
issued by the Company are then listed or the quotation of such securities on the
NASDAQ.

            (b)   Notwithstanding anything to the contrary herein contained, all
underwriting fees, discounts, selling commissions and stock transfer taxes
applicable to the sale of Registrable Securities will be borne by the
Stockholder owning such Registrable Securities.

                                      -16-
<PAGE>

            (c)   Notwithstanding anything to the contrary herein contained,
each selling Stockholder may have its own separate counsel in connection with
the registration of any of its Registrable Securities, which counsel may
participate therein to the full extent provided herein; provided, however, that
all fees and expenses of such separate counsel will be paid for by such selling
Stockholder.

      6.5.  Selection of Underwriter. The investment banker or investment
bankers and manager or managers that will manage any Demand Registration
offering will be jointly selected by the Company and the selling Stockholder
that gave the original Demand Notice in connection with such Demand
Registration.

                              VII. INDEMNIFICATION

      7.1.  Indemnification by the Company. The Company will indemnify and hold
harmless, to the fullest extent permitted by law, each Stockholder owning
Registrable Securities registered pursuant to this Agreement, its officers,
directors, trustees, agents and employees, each person who controls such
Stockholder (within the meaning of Section 15 of the Securities Act or Section
20 of the Exchange Act) and the officers, directors, trustees, agents and
employees of any such controlling person, from and against all losses, claims,
damages, liabilities, costs (including without limitation the costs of
investigation and attorneys' fees) and expenses (collectively, "Losses"), as
incurred, arising out of or based upon any untrue or alleged untrue statement of
a material fact contained in any Registration Statement, Prospectus or
preliminary prospectus, or arising out of or based upon any omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, except insofar as the
same are based solely upon information furnished in writing to the Company by or
on behalf of such Stockholder expressly for use therein; provided, however, that
the Company will not be liable to any Stockholder to the extent that any such
Losses arise out of or are based upon an untrue statement or alleged untrue
statement or omission or alleged omission made in any preliminary prospectus if
either (i) (A) such Stockholder failed to send or deliver a copy of the
Prospectus with or prior to the delivery of written confirmation of the sale by
such Stockholder of a Registrable Security to the person asserting the claim
from which such Losses arise and (B) the Prospectus would have completely
corrected such untrue statement or alleged untrue statement or such omission or
alleged omission, or (ii) such untrue statement or alleged untrue statement or
such omission or alleged omission is completely corrected in an amendment or
supplement to the Prospectus previously furnished by or on behalf of the Company
with copies of the Prospectus as so amended or supplemented, and such
Stockholder thereafter failed to deliver such Prospectus as so amended or
supplemented prior to or concurrently with the sale of a Registrable Security to
the person asserting the claim from which such Losses arise.

      7.2.  Indemnification by Stockholders. Each Stockholder will indemnify and
hold harmless, to the fullest extent permitted by law, the Company, its
officers, directors, agents and employees, each person who controls the Company
(within the meaning of Section 15 of the Securities Act or Section 20 of the
Exchange Act), and the directors, officers, agents and

                                      -17-
<PAGE>

employees of any such controlling person, from and against all Losses, as
incurred, arising out of or based upon any untrue statement of a material fact
contained in any Registration Statement, Prospectus or preliminary prospectus,
or arising out of or based upon any omission of a material fact required to be
stated therein or necessary to make the statements therein not misleading, to
the extent, but only to the extent, that such untrue statement or omission was
made in reliance upon and in conformity with information so furnished in writing
by or on behalf of such Stockholder to the Company expressly for use in such
Registration Statement, Prospectus or preliminary prospectus. In no event will
the liability of any Stockholder hereunder be greater in amount than the dollar
amount of the proceeds received by such Stockholder upon the sale of the
Registrable Securities giving rise to such indemnification obligation.

      7.3.  Conduct of Indemnification Proceedings. If any person shall become
entitled to indemnity hereunder (an "Indemnified Party"), such Indemnified Party
will give prompt notice to the party from which such indemnity is sought (the
"Indemnifying Party") of any claim or of the commencement of any action or
proceeding with respect to which such Indemnified Party seeks indemnification or
contribution pursuant hereto; provided, however, that the failure to so notify
the Indemnifying Party will not relieve the Indemnifying Party from any
obligation or liability except to the extent that the Indemnifying Party has
been prejudiced materially by such failure. If such an action or proceeding is
brought against the Indemnified Party, the Indemnifying Party will be entitled
to participate therein and, to the extent it may elect by written notice
delivered to the Indemnified Party promptly after receiving the notice referred
to in the immediately preceding sentence, to assume the defense thereof with
counsel reasonably satisfactory to the Indemnified Party. Notwithstanding the
foregoing, the Indemnified Party will have the right to employ its own counsel
in any such case, but the fees and expenses of such counsel will be at the
expense of the Indemnified Party unless (i) the employment of such counsel shall
have been authorized in writing by the Indemnifying Party, (ii) the Indemnifying
Party shall not have employed counsel (reasonably satisfactory to the
Indemnified Party) to take charge of such action or proceeding within a
reasonable time after notice of commencement thereof, or (iii) the Indemnified
Party reasonably shall have concluded that there may be defenses available to it
which are different from or additional to those available to the Indemnifying
Party which, if the Indemnifying Party and the Indemnified Party were to be
represented by the same counsel, could result in a conflict of interest for such
counsel or materially prejudice the prosecution of defenses available to the
Indemnified Party. If any of the events specified in clause (i), (ii) or (iii)
of the immediately preceding sentence are applicable, then the fees and expenses
of separate counsel for the Indemnified Party shall be borne by the Indemnifying
Party. If, in any case, the Indemnified Party employs separate counsel, the
Indemnifying Party will not have the right to direct the defense of such action
or proceeding on behalf of the Indemnified Party. All fees and expenses required
to be paid to the Indemnified Party pursuant to this Section 7 will be paid
periodically during the course of the investigation or defense, as and when
reasonably itemized bills therefor are delivered to the Indemnifying Party in
respect of any particular Loss that is incurred. Notwithstanding anything to the
contrary contained in this Section 7.3, an Indemnifying Party will not be liable
for the settlement of any action or proceeding effected without its prior
written consent. The Indemnifying Party will not consent to entry of any
judgment or enter into any settlement or otherwise seek to terminate any

                                      -18-
<PAGE>

action or proceeding in which any Indemnified Party is or could be a party and
as to which indemnification or contribution could be sought by such Indemnified
Party under this Article VII, unless such judgment, settlement or other
termination provides solely for the payment of money and includes as an
unconditional term thereof the giving by the claimant or plaintiff to such
Indemnified Party of a release, in form and substance satisfactory to the
Indemnified Party, from all liability in respect of such claim or litigation for
which such Indemnified Party would be entitled to indemnification hereunder.

      7.4.  Contribution, Etc. (a) If the indemnification provided for in this
Article VII is unavailable to an Indemnified Party under Section 7.1 or 7.2
hereof in respect of any Losses or is insufficient to hold such Indemnified
Party harmless, then each applicable Indemnifying Party, in lieu of indemnifying
such Indemnified Party, will, jointly and severally, contribute to the amount
paid or payable by such Indemnified Party as a result of such Losses, in such
proportion as is appropriate to reflect the relative fault of the Indemnifying
Party or Indemnifying Parties, on the one hand, and such Indemnified Party, on
the other hand, in connection with the actions, statements or omissions that
resulted in such Losses as well as any other relevant equitable considerations.
The relative fault of such Indemnifying Party or Indemnifying Parties, on the
one hand, and such Indemnified Party, on the other hand, will be determined by
reference to, among other things, whether any action in question, including any
untrue or alleged untrue statement of a material fact or omission or alleged
omission of a material fact, has been taken or made by, or related to
information supplied by, such Indemnifying Party or Indemnifying Parties or such
Indemnified Party, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such action, statement or
omission. The amount paid or payable by a party as a result of any Losses will
be deemed to include any legal or other fees or expenses incurred by such party
in connection with any action or proceeding.

            (b)   The parties hereto agree that it would not be just and
equitable if contribution pursuant to this Section 7.4 were determined by pro
rata allocation or by any other method of allocation that does not take into
account the equitable considerations referred to in the immediately preceding
paragraph. Notwithstanding anything contained in this Section 7.4 to the
contrary, an Indemnifying Party that is a selling Stockholder will not be
required to contribute any amount in excess of the amount by which the total
price at which the Registrable Securities were sold by such selling Stockholder
to the public exceeds the amount of any damages which such selling Stockholder
has otherwise been required to pay by reason of such untrue or alleged untrue
statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
will be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation.

            (c)   The provisions of this Article VII will survive indefinitely,
notwithstanding any transfer of the Registrable Securities by any Stockholder.

                                      -19-
<PAGE>

                                 VIII. RULE 144

            The Company will file all reports required to be filed by it under
the Securities Act and the Exchange Act, and will cooperate with any Stockholder
(including without limitation by making such representations as any such
Stockholder may reasonably request), all to the extent required from time to
time to enable such Stockholder to sell Registrable Securities without
registration under the Securities Act within the limitations of the exemptions
provided by Rule 144. Upon the request of any Stockholder, the Company will
deliver to such Stockholder a written statement as to whether it has complied
with such filing requirements.

                                IX. MISCELLANEOUS

      9.1.  Notices. All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be given or made by
delivery in person, by courier service, by facsimile transmission or by
registered or certified mail (postage prepaid, return receipt requested) to the
respective parties at the following addresses (or at such other address for a
party as shall be specified in a notice given in accordance with this Section
9.1):

            (a)   If to the Company:

                  Arch Communications Group, Inc.
                  1800 West Park Drive, Suite 250
                  Westborough, MA  01581
                  Attention:  J. Roy Pottle
                  Fax No.:    (508) 366-0846

                  with a copy to:

                  Hale and Dorr L.L.P.
                  60 State Street
                  Boston, MA  02109
                  Attention:  David A. Westenberg
                  Fax No.:    (617) 526-5000

                                      -20-
<PAGE>

            (b)   If to a Stockholder, to the following respective addresses
                  thereof:

                  (i)  Huff:                       (iii)  CSFB:
                  W.R. Huff Asset                  Credit Suisse First
                    Management Co., L.L.C.           Boston Corporation
                  67 Park Place, 9th Floor         11 Madison Avenue
                  Morristown, New Jersey 07960     New York, New York  10010
                  Attention: _________________     Attention:  David J. Matlin
                  Fax No.:  (___) ___-________                 Alex Lagetko
                                                   Fax No.:  (212) 325-8290
                                                  
                  with a copy to:                  with a copy to:
                                                  
                  ____________________________     Cadwalader, Wickersham & Taft
                  ____________________________     100 Maiden Lane
                  ____________________________     New York, New York  10038
                  Attention: _________________     Attention:  Michael J. Sage
                  Fax No.:  (___) ___-________     Fax No.:  (212) 504-6666
                                                  
                  (ii)  Whippoorwill:              (iv)  Northwestern:
                  Whippoorwill Associates, Inc.    The Northwestern Mutual Life
                  11 Martine Avenue                  Insurance Company
                  White Plains, New York 10606     720 E. Wisconsin Avenue
                  Attention:  ________________     Milwaukee, Wisconsin  53202
                  Fax No.:  (___) ___-________     Attention: Securities 
                                                              Department
                                                   Fax No.:  (414) 299-7124
                                                  
                  with a copy to:                  with a copy to:
                                                  
                  ____________________________     The Northwestern Mutual Life
                  ____________________________       Insurance Company
                  ____________________________     720 E. Wisconsin Avenue
                  ____________________________     Milwaukee, Wisconsin  53202
                  Attention: _________________     Attention:  Law Department
                  Fax No.:  (___) ___-________     Fax No.:  (414) 299-7016
                                               
All such notices and communications will be deemed to have been delivered or
given: upon delivery, if personally delivered; one business day after being
dispatched, if dispatched by same-day or next-day courier guaranteeing timely
delivery; when receipt acknowledged, if sent by facsimile transmission; and five
business days after being deposited in the mail, if mailed.

      9.2.  Assignment. Neither this Agreement nor the rights and obligations
hereunder may be assigned by operation of law or otherwise (except that this
Agreement and rights and

                                      -21-
<PAGE>

obligations hereunder may be assigned by any Stockholder to a Permitted Assignee
thereof, whereupon such Permitted Assignee shall be deemed to be a Stockholder
and a party hereto for all purposes of this Agreement). Notwithstanding the
foregoing, nothing herein contained shall restrict the right of any Stockholder
to transfer securities of the Company held by it.

      9.3.  No Third-Party Beneficiaries. This Agreement will be binding upon
and inure solely to the benefit of the parties hereto and their respective
successors and permitted assigns and nothing herein, express or implied, is
intended to or shall confer upon any other person any legal or equitable right,
benefit or remedy of any nature whatsoever under or by reason of this Agreement.

      9.4.  Entire Agreement. This Agreement constitutes the entire agreement of
the parties hereto with respect to the subject matter hereof and supersedes all
prior agreements and undertakings, both written and oral, among the parties with
respect to the subject matter hereof.

      9.5.  No Inconsistent Agreements. Except for the Adelphia Agreement, the
Company does not have, as of the Effective Date, and will not, on or after the
Effective Date, enter into, any agreement with respect to its securities which
is inconsistent with the rights granted to the Stockholders in this Agreement or
otherwise conflicts with the provisions hereof.

      9.6.  Amendment and Waiver. This Agreement may not be amended or modified
or any provision hereof waived except by an instrument in writing signed by or
on behalf of each party. Notwithstanding anything contained herein to the
contrary, a waiver that does not adversely affect all of the parties hereto may
be executed by only the adversely affected party or parties.

      9.7.  Headings. The descriptive headings contained in this Agreement are
for convenience of reference only and shall not affect in any way the meaning or
interpretation of this Agreement.

      9.8.  Certain Interpretative Matters and Definitions. Unless the context
otherwise requires, (i) all references to Articles, Sections, or Schedules are
to Articles, Sections, or Schedules of this Agreement, (ii) each term defined in
this Agreement has the meaning assigned to it, (iii) all uses of "herein,"
"hereto," "hereof" and words similar thereto in this Agreement refer to this
Agreement in its entirety, and not solely to the Article, Section, or provision
in which it appears, (iv) "or" is disjunctive but not necessarily exclusive, and
(v) words in the singular include the plural and vice versa.

      9.9.  Severability. If any term or other provision of this Agreement is
invalid, illegal or incapable of being enforced under any law or public policy,
all other terms and provisions of this Agreement will nevertheless remain in
full force and effect. Upon such determination that any term or other provision
is invalid, illegal or incapable of being enforced, the parties hereto will
negotiate in good faith to modify this Agreement so as to effect the original
intent of the parties as closely as possible in an acceptable manner.

                                      -22-
<PAGE>

      9.10. Governing Law. This Agreement will be governed by, and construed in
accordance with, the laws of the State of Delaware applicable to contracts
executed in and to be performed entirely within that state.

      9.11. Specific Performance. The parties hereto agree that irreparable
damage would occur in the event any provision of this Agreement was not
performed in accordance with the terms hereof and that the parties will be
entitled to specific performance of the terms hereof, in addition to any other
remedy at law or equity.

      9.12. Attorneys' Fees. In any action or proceeding brought to enforce any
provision of this Agreement, or where any provision hereof is validly asserted
as a defense, the successful party will be entitled to recover reasonable
attorneys' fees in addition to its costs and expenses and any other available
remedy.

      9.13. Further Assurances. The parties hereto will do such further acts and
things necessary to ensure that the terms of this Agreement are carried out and
observed.

      9.14. Counterparts. This Agreement may be executed in one or more
counterparts, and by the different parties hereto in separate counterparts, each
of which when executed will be deemed to be an original but all of which
together will constitute one and the same agreement.

                                      -23-
<PAGE>

            IN WITNESS WHEREOF, each of the parties hereto has executed this
Agreement as of the date first written above.


                                          ARCH COMMUNICATIONS GROUP, INC.       
                                          
                                          By: 
                                             -------------------------------
                                          Name:
                                               -----------------------------
                                          Title: 
                                                ----------------------------
                                          
                                          
                                          W.R. HUFF ASSET MANAGEMENT CO., L.L.C.
                                          
                                          By: 
                                             -------------------------------
                                          Name:
                                               -----------------------------
                                          Title: 
                                                ----------------------------
                                          
                                          
                                          WHIPPOORWILL ASSOCIATES, INC.
                                          
                                          By: 
                                             -------------------------------
                                          Name:
                                               -----------------------------
                                          Title: 
                                                ----------------------------
                                          
                                          
                                          CREDIT SUISSE FIRST BOSTON CORPORATION
                                          
                                          By: 
                                             -------------------------------
                                          Name:
                                               -----------------------------
                                          Title: 
                                                ----------------------------
                                          
                                          
                                          THE NORTHWESTERN MUTUAL LIFE
                                          INSURANCE COMPANY
                                          
                                          By: 
                                             -------------------------------
                                          Name:
                                               -----------------------------
                                          Its Authorized Representative
                                          

                                      -24-
<PAGE>

                                          THE NORTHWESTERN MUTUAL LIFE
                                          INSURANCE COMPANY FOR ITS GROUP
                                          ANNUITY SEPARATE ACCOUNT
                                          
                                          By: NORTHWESTERN INVESTMENT
                                          MANAGEMENT COMPANY
                                          
                                          By: 
                                             -------------------------------
                                          Name:
                                               -----------------------------
                                          Title: 
                                                ----------------------------
                                          
                                          
                                          NORTHWESTERN MUTUAL SERIES FUND, INC.
                                          FOR THE HIGH YIELD BOND PORTFOLIO
                                          
                                          By: 
                                             -------------------------------
                                          Name:
                                               -----------------------------
                                          Title: 
                                                ----------------------------

                                      -25-
<PAGE>

                                                                      SCHEDULE I
                                                                      ----------

                                INITIAL OWNERSHIP
                                -----------------

<TABLE>
<CAPTION>
                                                                                [Number of
                                                          Number of               Class B
                                                            Common                Common              Number of
                     Stockholder                            Shares                Shares](5)          Warrants
                     -----------                            ------                --------            --------
<S>                                                         <C>                   <C>                 <C> 
W.R. Huff Asset Management Co., L.L.C................

Whippoorwill Associates, Inc.........................

Credit Suisse First Boston Corporation...............

The Northwestern Mutual Life Insurance
Company..............................................

The Northwestern Mutual Life Insurance
Company for its Group Annuity Separate Account.......

Northwestern Mutual Series Fund, Inc. for the
High Yield Bond Portfolio............................
</TABLE>

- ----------

(5) To be included only if Class B Common Shares are actually issued on the
Effective Date

                                      -26-
<PAGE>

                                                                       Exhibit G
                                                                       ---------



                      NORTHWESTERN MUTUAL SERIES FUND, INC.
                        for the High Yield Bond Portfolio
                            720 East Wisconsin Avenue
                           Milwaukee, Wisconsin 53202

                                 August 18, 1998



Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts  01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey  07024

                  Re:   Commitment to Purchase Stock and Warrants
                        -----------------------------------------

Gentlemen:

         Arch Communications Group, Inc., a Delaware corporation ("Arch"), and
MobileMedia Communications, Inc., a Delaware corporation ("MobileMedia"), intend
to engage in a business combination transaction (the "Combination") as part of a
reorganization (the "Reorganization") of MobileMedia, MobileMedia Corporation,
the sole stockholder of MobileMedia ("Parent"), and all of MobileMedia's
subsidiaries (collectively, the "Debtors") pursuant to chapter 11 of title 11,
United States Code, 11 U.S.C. ss.ss. 101 et seq. (the "Bankruptcy Code"). It is
our understanding that in connection with the Reorganization, among other
things: (a) pursuant to the Agreement and Plan of Merger, dated as of the date
hereof (the "Merger Agreement"), among Arch, a wholly owned subsidiary of Arch
("Merger Sub"), Parent and MobileMedia, MobileMedia will merge with and into
Merger Sub, with Merger Sub continuing as the surviving corporation and a wholly
owned subsidiary of Arch; (b) pursuant to the Merger Agreement, Arch will make
available for distribution pursuant to a plan of reorganization of the Debtors
in the form attached as Exhibit A to the Merger Agreement, with such amendments
and modifications thereto as are made in a manner consistent with clause (e) of
Section 5 hereto (such plan of reorganization being referred to herein as the
"Plan"), (i) cash, (ii) shares of its Common Stock, par value $.01 per share
("Existing Arch Common Stock"), and (iii) warrants entitling the holders thereof
to purchase shares of Existing Arch Common Stock ("Arch Warrants"), with such
Arch Warrants to be issued pursuant to, and to have the terms set forth in, a
warrant agreement in the form attached as Exhibit B to the Merger Agreement (the
"Arch Warrant Agreement"); (c) holders of unsecured non-priority claims against
the Debtors ("Unsecured Claims"), to the extent such Unsecured
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2


Claims are Allowed (as defined in the Plan), will receive pursuant to the Plan
(i) shares of Existing Arch Common Stock and (ii) rights to purchase ("Rights")
for cash units consisting of (A) shares of Existing Arch Common Stock and (B)
Arch Warrants; (d) holders of claims arising under or relating to the Credit
Agreement, dated December 4, 1995, as amended, among MobileMedia and the other
parties thereto ("Secured Claims"), to the extent such Secured Claims are
Allowed, will receive pursuant to the Plan cash in an amount equal to 100% of
such claims; (e) all of the outstanding equity interests in MobileMedia and
Parent will be canceled without consideration and Parent will be dissolved; and
(f) the commitments under the DIP Loan Agreement will terminate and all amounts
owed under or in respect of the DIP Loan Agreement will be paid in full in cash.

      Terms used herein with initial capital letters that are not otherwise
defined shall have the meanings ascribed to such terms in the Merger Agreement.

      1.    The Commitment. In connection with the foregoing, Northwestern
Mutual Series Fund, Inc. for the High Yield Bond Portfolio (the "Standby
Purchaser") hereby advises you of its commitment (the "Commitment"), subject to
the conditions set forth herein:

            (a)   to exercise any Rights distributed to it in respect of its
      Allowed Unsecured Claims in accordance with the Plan and not thereafter
      sold or transferred as permitted by Section 3 below to purchase units
      consisting of shares of Existing Arch Common Stock and Arch Warrants
      underlying such Rights, to the extent that the aggregate purchase price
      payable upon such exercise, as determined in accordance with Schedule II
      to the Merger Agreement (the "Subscription Price"), does not exceed the
      Rights Exercise Commitment Amount of the Standby Purchaser as set forth in
      Annex I hereto;

            (b)   if (i) the Standby Purchaser sells or otherwise transfers any
      or all of (A) the Rights distributed to it in accordance with the Plan or
      (B) Unsecured Claims held by it as of the date hereof in respect of which
      Rights are to be distributed, in each case as permitted by Section 3
      below, and (ii) the Rights sold or transferred by the Standby Purchaser or
      the Rights distributed in respect of Unsecured Claims held by it as of the
      date hereof that are hereafter sold or transferred by the Standby
      Purchaser are not exercised prior to the expiration thereof (at which time
      such Rights will be void and will no longer be exercisable), to purchase
      for cash (based upon the Subscription Price payable upon exercise of such
      Rights) identical units consisting of shares of Existing Arch Common Stock
      and Arch Warrants underlying such unexercised Rights, to the extent that
      the aggregate purchase price therefor, together with the aggregate
      Subscription Price payable upon exercise of Rights exercised as
      contemplated by clause (a) above, does not exceed
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3


      the Rights Exercise Commitment Amount of the Standby Purchaser as set
      forth in Annex I hereto; and

            (c)   if any Rights distributed in accordance with the Plan (other
      than (i) Rights distributed to the Standby Purchaser or the other holders
      of Unsecured Claims listed on Annex I hereto (the "Other Standby
      Purchasers") and retained by them (which Rights are referred to in Section
      1(a) above and Section 1(a) of each of the Other Standby Purchase
      Commitments (as defined in Section 13(a) below)) or (ii) subject to
      Section 3(b) below, Rights distributed in respect of Unsecured Claims held
      by the Standby Purchaser or the Other Standby Purchasers as of the date
      hereof that are hereafter sold or transferred by them (which Rights are
      referred to in Sections 1(b) and 3 hereof and Sections 1(b) and 3 of each
      of the Other Standby Purchase Commitments)) remain unexercised upon the
      expiration thereof (at which time such Rights will be void and will no
      longer be exercisable), to purchase for cash (based on the Subscription
      Price payable upon exercise of such Rights) pro rata in accordance with
      and up to the Unexercised Rights Commitment Amount of the Standby
      Purchaser as set forth in Annex I hereto identical units consisting of
      shares of Existing Arch Common Stock and Arch Warrants underlying such
      unexercised Rights.

      2. Arch Class B Common Stock. (a) Notwithstanding anything to the contrary
herein contained, if the purchases by the Standby Purchaser contemplated by
Section 1 above would cause the Standby Purchaser, the Other Standby Purchasers,
and any other persons or entities who, when taken together with any one or more
of the Standby Purchaser and the Other Standby Purchasers, would constitute a
"person" or "group" as used in Section 13(d) or Section 14(d) of the Exchange
Act or Rule 13d-3 or Rule 13d-5 promulgated thereunder, or any "affiliate" as
defined in Rule 405 promulgated under the Securities Act of any of them
(collectively, the "Standby Class B Holders"), in the aggregate, to beneficially
own on the effective date of the Plan (the "Effective Date") shares representing
more than 49.0% of the capital stock of Arch generally entitled to vote in the
election of directors or more than 49.0% of the total voting power of the
capital stock of Arch, Arch will substitute shares of Class B Common Stock, par
value $.01 per share, of Arch ("Arch Class B Common Stock"), with such Arch
Class B Common Stock having the terms set forth in the form of Certificate of
Amendment to Certificate of Incorporation of Arch attached as Exhibit F to the
Merger Agreement (the "Arch Charter Amendment"), for shares of Existing Arch
Common Stock included in the units so purchased on a one-for-one basis such that
on the Effective Date the Standby Class B Holders, in the aggregate, will
beneficially own shares representing not more than 49.0% of the capital stock of
Arch generally entitled to vote in the election of directors and not more than
49.0% of the total voting power of the capital stock of Arch, all as provided in
the Plan. For purposes of this letter agreement, "beneficial ownership" shall be
determined as provided in Rule 13d-3 and Rule 13d-5 promulgated under the
Exchange
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4


Act, except that a person or entity shall be deemed to have "beneficial
ownership" of all securities that such person or entity has the right to
acquire, whether such right is exercisable immediately or only after the passage
of time.

            (b)   For purposes of calculating the percentages referred to in
Section 2(a) above, it will be assumed that no additional Unsecured Claims are
allowed after the Effective Date and all of the shares of Existing Arch Common
Stock in the Creditor Stock Pool (as defined in the Plan) are distributed in
accordance with the Plan to the holders of Allowed Unsecured Claims as of the
Effective Date.

            (c)   Substitution of shares of Class B Common Stock as contemplated
by Section 2(a) above will be effectuated as follows:

                  (i)   first, to the extent that the Standby Purchaser or any
            Other Standby Purchaser beneficially owns shares of Existing Arch
            Common Stock as of the Effective Date, other than those acquired as
            contemplated by the Plan, the Merger Agreement, this letter
            agreement and the Other Standby Purchase Commitments ("Non-Plan Arch
            Shares"), among the Standby Purchaser and such Other Standby
            Purchaser pro rata based on ownership of Non-Plan Arch Shares up to
            an amount equal to the aggregate number of Non-Plan Arch Shares
            beneficially owned by them as of the Effective Date; and

                  (ii)  second, if necessary, among the Standby Purchaser and
            the Other Standby Purchasers in accordance with the percentages set
            forth in Column D of Annex I hereto.

            (d)   The Standby Purchaser hereby disclaims beneficial ownership of
any securities of Arch owned by the Other Standby Purchasers.

      3.    Certain Transfer Restrictions. (a) Subject to Section 12 below, the
Standby Purchaser may (i) sell or otherwise transfer any or all of (A) the
Rights distributed to it in accordance with the Plan or (B) Unsecured Claims in
respect of which Rights are to be distributed or (ii) purchase or otherwise
acquire (A) Rights distributed to others in accordance with the Plan or (B)
Unsecured Claims in respect of which Rights are to be distributed; provided,
however, that, with respect to clause (i) of this sentence, (X)
contemporaneously with the consummation of any such sale or other transfer of
Rights or Unsecured Claims, the Standby Purchaser will notify Arch and
MobileMedia of the occurrence thereof and (Y) the Standby Purchaser will not
consummate any such sale or other transfer unless the transferee or transferees
of such Rights or Unsecured Claims shall have entered into a written agreement
(a "Tracking Agreement") (I) to
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5


notify the Standby Purchaser, Arch and MobileMedia of any subsequent transfer by
it of such Rights or Unsecured Claims or any Rights distributed to it in respect
of such Unsecured Claims and (II) not to sell or otherwise transfer such Rights
or Unsecured Claims or Rights distributed to it in respect of such Unsecured
Claims, unless its transferee or transferees shall agree in writing to be bound
in the same manner provided in this clause (Y) with respect to any subsequent
transfer by it.

      (b)   Notwithstanding the provisions of clause (Y) of the proviso in
Section 3(a) above, the Standby Purchaser may elect to sell or otherwise
transfer (i) any or all of the Rights distributed to it in accordance with the
Plan or (ii) Unsecured Claims in respect of which Rights are to be so
distributed, in either case without entering into a Tracking Agreement with its
transferee or transferees (any Rights so transferred and any Rights distributed
in respect of Allowed Claims so transferred, together with any Rights so
transferred and any Rights distributed in respect of Allowed Claims so
transferred by the Other Standby Purchasers pursuant to Section 3(b) of the
Other Standby Purchase Commitments, being referred to herein collectively as
"Untracked Rights"). Any Rights that remain unexercised upon expiration thereof
will be deemed to be "Section 3(b) Rights" up to, but not exceeding, the amount
of Untracked Rights. The Section 3(b) Rights shall be exercised as follows prior
to the application of Section 1(c) above and Section 1(c) of the Other Standby
Purchase Commitments: (A) the Standby Purchaser and the Other Standby Purchasers
will first be given the opportunity to purchase for cash (based on the
Subscription Price payable upon exercise of such Rights) units consisting of
shares of Arch Common Stock and Arch Warrants underlying a number of unexercised
Rights up to the amount of Section 3(b) Rights in accordance with the
percentages set forth in Column D of Annex I hereto and (B) to the extent such
units are not so purchased, the Standby Purchaser and any Other Standby
Purchasers that are responsible for the existence of the Section 3(b) Rights
will be required to purchase such units pro rata based on the number of Section
3(b) Rights resulting from their respective transfers. Nothing in this Section
3(b) will in any way reduce the commitment of the Standby Purchaser specified in
Section 1(c) above or the Unexercised Rights Commitment Amount as set forth in
Annex I hereto.

      4.    The Closing. (a) Notwithstanding anything to the contrary herein
contained or the terms of the Rights or the Plan, subject to the conditions set
forth herein, on the Effective Date the Standby Purchaser, in satisfaction of
the Commitment, will deliver at the Closing (i) the aggregate Subscription Price
payable upon exercise of any Rights exercised by it and (ii) the purchase price
payable in consideration of any shares of Existing Arch Common Stock or, if
applicable, Arch Class B Common Stock and Arch Warrants to be otherwise
purchased by it pursuant to the Commitment; provided, however, that, if
requested by the Standby Purchaser in writing at least two business days prior
to the Effective Date, any cash to be distributed to the Standby Purchaser in
respect of Allowed Secured Claims pursuant to the Plan will, prior to the
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6


distribution thereof pursuant to the Plan and in accordance with the instruction
included in such written request, be first applied, on behalf of the Standby
Purchaser, to the payment of such amounts payable on the Effective Date as
provided in this Section 4(a).

            (b)   Upon payment of the amounts payable as provided in Section
4(a), on the Effective Date at the Closing Arch will deliver to the Standby
Purchaser (or its designees) certificates representing the shares of Existing
Arch Common Stock, shares of Arch Class B Common Stock, if applicable, and the
Arch Warrants, in each case, (i) issuable upon exercise of any Rights exercised
by the Standby Purchaser or (ii) otherwise purchased by the Standby Purchaser
pursuant to the Commitment.

            (c)   Arch will deliver to the Standby Purchaser at least five
business days prior to the Effective Date a written notice which shall (i)
specify the amounts payable at the Closing by it in satisfaction of the
Commitment, (ii) specify the date on which the Effective Date is to occur and
the last date on which the notice referred to in Section 4(d) may to be
delivered, and (iii) indicate the matters required to be addressed in such
notice.

            (d)   At least two business days prior to the Effective Date, the
Standby Purchaser will deliver to Arch and MobileMedia a written notice which
shall set forth the number of shares of Existing Arch Common Stock beneficially
owned by it as of such date. During the period from the date of such notice
through the Effective Date, neither the Standby Purchaser nor any affiliate
thereof shall acquire beneficial ownership of, or any rights to acquire, any
additional shares of Existing Arch Common Stock or any Unsecured Claim.

      5.    Certain Conditions. The Commitment is subject to the conditions
that:

            (a)   (i) the Confirmation Order (as defined in the Plan), in a form
      reasonably satisfactory to the Standby Purchaser, shall have been entered
      by the Bankruptcy Court (as defined in the Plan) and (ii) such
      Confirmation Order shall have become a Final Order (as defined in Section
      5.1(h) of the Merger Agreement); provided, however, that (A) the Standby
      Purchaser may not assert the condition contained in clause (ii) above if
      each of the Other Standby Purchasers that is not affiliated with the
      Standby Purchaser (each, an "Unaffiliated Standby Purchaser"), acting in
      good faith, shall have waived the condition contained in Section 5(a) of
      the Other Standby Purchase Commitments to which such Unaffiliated Standby
      Purchaser is a party and (B) the Standby Purchaser may not assert the
      condition contained in either clause (i) or clause (ii) above if the sole
      reason for the failure of such condition to be satisfied is the failure or
      the threatened failure of the Standby Purchaser or any of its affiliates
      to fulfill the Commitment;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7


            (b)   the satisfaction or, with the written consent of the Standby
      Purchaser, waiver of all conditions precedent to the obligations of each
      of the parties to the Merger Agreement contained in the Merger Agreement
      and all conditions precedent to the effectiveness of the Plan contained in
      the Plan; provided, however, that (i) the conditions contained in Section
      5.1(e) and (h), Section 5.2(a), (b), (c), (d) and (e) and Section 5.3(a),
      (b), (c) and (e) of the Merger Agreement (collectively, the "Unilateral
      Conditions") may be waived without the written consent of the Standby
      Purchaser and (ii) the Standby Purchaser may not assert the condition
      contained in this clause (b) if the sole reason for the failure of such
      condition to be satisfied is the failure or the threatened failure of the
      Standby Purchaser or any of its affiliates to fulfill the Commitment;

            (c)   there shall be effective under the Securities Act, a
      registration statement (the "Shelf Registration Statement") covering the
      resale by the Standby Purchaser of (i) all shares of Existing Arch Common
      Stock, all shares of Arch Class B Common Stock, if applicable, and all
      Arch Warrants received by the Standby Purchaser as a result of the
      transactions contemplated by the Plan (including those received upon the
      exercise of Rights and pursuant to this letter agreement) and (ii) all
      shares of Existing Arch Common Stock issuable upon conversion of any such
      shares of the Arch Class B Common Stock or exercise of any such Arch
      Warrants (the securities referred to in the foregoing clauses (i) and (ii)
      are referred to herein as the "Registrable Securities");

            (d)   Arch shall have executed and delivered to the Standby
      Purchaser a registration rights agreement in the form attached as Exhibit
      C to the Merger Agreement (the "Registration Rights Agreement") granting
      the Standby Purchaser certain demand and piggyback registration rights
      with respect to the Registrable Securities;

            (e)   any and all amendments or modifications to the Merger
      Agreement or any exhibit or schedule thereto (including without limitation
      the Plan, the Arch Charter Amendment, the Arch Warrant Agreement and the
      Registration Rights Agreement) on or after the date hereof and any
      consents or waivers delivered on or after the date hereof by Arch or
      MobileMedia to the other under the Merger Agreement (other than (i)
      subject to Section 15(a) below, consents under Section 4.5 of the Merger
      Agreement or (ii) waivers of Unilateral Conditions) shall have been in
      form and substance reasonably satisfactory to the Standby Purchaser;

            (f)   the representations and warranties of Arch contained in this
      letter agreement shall be true and correct, in all material respects
      (except for the representations and warranties set forth at clauses (a)(v)
      and (a)(vi) of Section 9 below, which shall be true and correct in all
      respects, and except for the representations and warranties set forth
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8


      at clauses (a)(vii) and (a)(viii) of Section 9 below, which shall be
      disregarded for purposes of this clause (f) insofar as they relate to
      financial projections), on the Effective Date, with the same effect as
      though such representations and warranties were made on the Effective
      Date, and Arch shall have performed or complied with, in all material
      respects, its covenants required to be performed or complied with under
      this letter agreement on or prior to the Effective Date (and Arch shall
      have delivered to the Standby Purchaser a certificate to the effect that
      each of the conditions specified in this clause (f) is satisfied in all
      respects);

            (g)   the representations and warranties of MobileMedia contained in
      this letter agreement shall be true and correct, in all material respects
      (except for the representations and warranties set forth at clauses (b)(v)
      and (b)(vi) of Section 9 below, which shall be true and correct in all
      respects, and except for the representations and warranties set forth at
      clauses (b)(vii) and (b)(viii) of Section 9 below, which shall be
      disregarded for purposes of this clause (f) insofar as they relate to
      financial projections), on the Effective Date, with the same effect as
      though such representations and warranties were made on the Effective
      Date, and MobileMedia shall have performed or complied with, in all
      material respects, its covenants required to be performed or complied
      with, under this letter agreement on or prior to the Effective Date (and
      MobileMedia shall have delivered to the Standby Purchaser a certificate to
      the effect that each of the conditions specified in this clause (g) is
      satisfied in all respects);

            (h)   simultaneously with the transactions contemplated by Section 4
      above, Arch shall have performed its obligation under clause (e) of
      Section 1.3 of the Merger Agreement and any debt financing (other than
      secured bank financing) obtained by Arch to enable it to do so shall have
      terms no less favorable to Arch than those set forth in the Bridge
      Commitment Letter; provided, however, that the Standby Purchaser may not
      assert the condition contained in this clause (h) if the sole reason for
      the failure of such condition to be satisfied is the failure or threatened
      failure of the Standby Purchaser or any of its affiliates to fulfill the
      Commitment;

            (i)   simultaneously with the transactions contemplated by Section 4
      above, each of the Other Standby Purchasers shall have fulfilled its
      commitment under the Other Standby Purchase Commitment to which it is a
      party, and, if applicable, any other person having a commitment
      contemplated by Section 13(a) hereof shall have fulfilled such commitment;

            (j)   (i) the shares of Existing Arch Common Stock to be issued and
      distributed as contemplated by Section 1.3(e) and Section 1.6 of the
      Merger Agreement shall be so
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9


      issued and distributed pursuant to an exemption from registration under
      the Securities Act provided by Section 1145 of the Bankruptcy Code, and
      (ii)(A) the issuance of the Rights, (B) the issuance of the shares of
      Existing Arch Common Stock, the shares of Arch Class B Common Stock, if
      applicable, and the Arch Warrants upon exercise of the Rights, (C) the
      issuance to the Standby Purchaser of the shares of Existing Arch Common
      Stock, the shares of Arch Class B Common Stock, if applicable, and the
      Arch Warrants as contemplated by Section 1 and Section 3 above and the
      Arch Warrants as contemplated by Section 7 below, and (D) the issuance of
      Existing Arch Common Stock upon exercise of the Arch Warrants or
      conversion of Arch Class B Common Stock, if applicable, shall be covered
      by the Registration Statement, the Registration Statement shall have been
      declared effective and no stop order with respect thereto shall be in
      effect;

            (k)   (i) the FCC Grant shall have been issued by the FCC and (ii)
      such FCC Grant shall have become a Final Order (as defined in Section
      5.1(e) of the Merger Agreement); provided, however, that (A) the Standby
      Purchaser may not assert the condition contained in clause (ii) above if
      each of the Unaffiliated Standby Purchasers, acting in good faith, shall
      have waived the condition contained in Section 5(k) of the Other Standby
      Purchase Commitment to which such Unaffiliated Standby Purchaser is a
      party or (B) the Standby Purchaser may not assert the condition contained
      in either clause (i) or clause (ii) above if the sole reason for the
      failure of such condition to be satisfied is an appeal, a motion for
      reconsideration or similar action taken by any present or former officer
      of any Debtor considered or determined by the FCC to be an alleged or
      actual wrongdoer for purposes of the FCC Proceeding;

            (l)   any applicable waiting period under the HSR Act shall have
      expired or been terminated early; and

            (m)   Arch shall have filed with the SEC no later than Friday,
      August 21, 1998 a preliminary Proxy Statement which shall not include any
      information that a reasonable investor would consider important in
      determining whether to make an investment decision regarding a purchase of
      Existing Arch Common Stock and would view its disclosure as significantly
      altering the total mix of information otherwise contained therein, which
      information is not included in the Draft Proxy Statement; provided,
      however, that the Standby Purchaser may not assert the condition in this
      clause (m) unless (i) the information with respect to which the Standby
      Purchaser seeks to assert such condition relates to information other than
      the descriptions of the Merger, the Plan and the other exhibits thereto
      contained in the preliminary Proxy Statement and (ii) such condition is
      asserted by the Standby Purchaser not later than two business days after
      Arch delivers to the Standby Purchaser a copy of the preliminary Proxy
      Statement as filed with the SEC
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10


      indicating the changes therein from the Draft Proxy Statement (which copy
      Arch will deliver as promptly as practicable following filing the same
      with the SEC).

The Standby Purchaser hereby acknowledges and agrees that (i) the entities with
an asterisk next to their names on Annex I hereto (the "Affiliated Standby
Purchasers") shall be deemed to be affiliated with each other for purposes of
clauses (a) and (k) above and clause (iii) of Section 6 below, and (ii) the
Affiliated Standby Purchasers will act jointly with respect to any decision to
waive the condition contained in any such clause and the corresponding clause
contained in the Other Standby Purchase Commitments to which such Affiliated
Standby Purchasers are parties (with the vote of the Affiliated Standby
Purchasers holding at least 85% of the aggregate amount of Unsecured Claims held
by such Affiliated Standby Purchasers to control with respect to the taking of
any such action).

      6.    Additional Condition. The Commitment is subject to the further
condition that there shall not have occurred between the Buyer Balance Sheet
Date and the Confirmation Date, and, if the Effective Date does not occur within
90 days following the Confirmation Date, between the Buyer Balance Sheet Date
and the Effective Date (i) any event or events (other than events which affect
generally the economy or the industry in which Buyer and MobileMedia conduct
their respective businesses) which has had or would have a material adverse
effect on the business, assets (including licenses, franchise and other
intangible assets), financial condition, operating income or prospects
(determined in each case, where applicable, in accordance with generally
accepted accounting principles and in a manner consistent with the past
practices of Arch and MobileMedia) of Arch, MobileMedia and their respective
subsidiaries, taken as a whole (collectively, the "Combined Company") (a
"Combined Company Material Adverse Effect"), (ii) any event or events involving
a regulatory or statutory change and affecting generally the industry in which
Arch and MobileMedia conduct their respective businesses which would materially
and adversely affect the ability of the Combined Company to operate its
business, or (iii) any event or events affecting generally the industry in which
Arch and MobileMedia conduct their respective business which would materially
and adversely affect the ability of the Combined Company to operate its
business; provided, however, that the Standby Purchaser may not assert the
condition contained in this clause (iii) if each of the Unaffiliated Standby
Purchasers, acting in good faith, shall have waived the condition in Section
6(iii) of the Other Standby Purchase Commitment to which such Unaffiliated
Standby Purchaser is a party.

      7.    Consideration for the Commitment. In consideration for the
Commitment, on the Effective Date at the Closing the Standby Purchaser will
receive its pro rata share of Arch Warrants entitling the holders thereof to
purchase, in the aggregate, a number of shares of Existing Arch Common Stock
equal to 2.50% of the issued and outstanding shares of Existing Arch Common
Stock and, if applicable, Arch Class B Common Stock, computed on a Fully
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11


Diluted Basis (as defined in the Plan) on the date the "Buyer Market Price" is
determined in accordance with Schedule II to the Merger Agreement giving effect
to the Plan as if the Effective Date had occurred on such date and assuming
21,067,110 shares of Existing Arch Common Stock are issued and outstanding
immediately prior thereto. Such Arch Warrants will be delivered to the Standby
Purchaser and the Other Standby Purchasers, in accordance with the percentages
specified in Column D of Annex I hereto.

      8.    Satisfaction of the Commitment. The Standby Purchaser may, in its
sole discretion, satisfy the Commitment directly and/or indirectly through one
or more of its affiliates, separate accounts within its control or investment
funds under its or its affiliates' management.

      9.    Representations and Warranties. (a) Arch hereby represents and
warrants to the Standby Purchaser that:

                  (i)   Arch is a corporation duly organized, validly existing
            and in good standing under the laws of the State of Delaware and has
            all requisite corporate power and authority to execute, deliver and
            perform its obligations hereunder and to consummate the transactions
            contemplated hereby;

                  (ii)  Subject to the approval of the Buyer Charter Amendment
            and the Buyer Share Issuance by the Stockholders of Arch, the
            execution, delivery and performance of this letter agreement by Arch
            and the consummation by Arch of the transactions contemplated hereby
            have been duly and validly authorized by all necessary corporate
            action on the part of Arch;

                  (iii) This letter agreement constitutes the legal, valid and
            binding obligation of Arch, enforceable against Arch in accordance
            with its terms;

                  (iv)  Subject to entry of the Certification Order, and except
            as described in Section 3.3 of the Buyer Disclosure Schedule and
            except for the applicable requirements of the Securities Act, the
            Exchange Act and any applicable state and foreign securities laws,
            the HSR Act, the Communications Act and the regulations of the FCC,
            state public utility, telecommunications or public service laws and
            the Bankruptcy Code, the Confirmation Order and the Amended Plan
            (collectively, the "Applicable Requirements"), the execution,
            delivery and performance of this letter agreement by Arch and the
            consummation by Arch of the transactions contemplated hereby in
            accordance with the terms hereof do not and will not conflict with,
            violate or constitute a breach of any material contract, agreement
            or instrument by which Arch is bound or any judgment, order, decree,
            law, statute,
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 12


            rule, regulation or other judicial or governmental restriction to
            which Arch is subject;

                  (v)   Except as described in the Buyer Disclosure Schedule,
            the representations and warranties of Arch contained in the Merger
            Agreement (other than those contained in Sections 3.6, 3.7, 3.26 and
            3.27 thereof), which representations and warranties shall be deemed
            for purposes of this clause (v) not to include any qualification or
            limitation with respect to materiality (whether by reference to
            "Buyer Material Adverse Effect" or otherwise), are true and correct,
            except where the matters in respect of which such representations
            and warranties are not true and correct would not have a Buyer
            Material Adverse Effect;

                  (vi)  True, complete and correct copies of the following
            documents are attached hereto as indicated:


                            Document                        Exhibit Hereto
            ----------------------------------------        --------------
            Merger Agreement (including all exhibits             A
            and schedules thereto)                        
                                                          
            Buyer Disclosure Schedule                            B
                                                          
            Other Standby Purchase Commitments                   C
                                                          
            Certificate of Incorporation of Arch, as             D
            amended through the date hereof               
                                                          
            By-laws of Arch, as amended through the              E
            date hereof                                   
                                                          
            Rights Agreement, dated as of October 13,            F
            1995, between Arch and the Bank of New        
            York, as Rights Agent, as amended             
            through the date hereof  (the "Rights         
            Agreement")                                   
                                                          
            Draft of the Proxy Statement dated                   G
            August 18, 1998 (the "Draft Proxy             
            Statement")                                   
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 13


                            Document                        Exhibit Hereto
            ----------------------------------------        --------------
            Existing Registration Rights Agreements              H
            (as defined in Section 9(a)(xi) below),

            Bridge Commitment Letter                             I

                  (vii) As of the date hereof, the Draft Proxy Statement
            contains no untrue statement of a material fact or omits to state
            any material fact necessary, in light of the circumstances under
            which it was made, in order to make the statements therein not
            misleading; provided, however, Arch makes no representation with
            respect to either (A) information supplied by MobileMedia for
            inclusion therein or (B) the descriptions of the Merger Agreement,
            the Plan and the other exhibits to the Merger Agreement, and of this
            letter agreement and the Other Standby Purchase Commitments,
            contained therein;

                  (viii) No representation or warranty of Arch contained in this
            letter agreement, and no statement relating to Arch contained in the
            Merger Agreement, the Buyer Disclosure Schedule or any other
            document, certificate or other instrument delivered or to be
            delivered by or on behalf of Arch pursuant to this letter agreement
            (including the definitive Proxy Statement and the Registration
            Statement as declared effective by the SEC), contains or will as of
            the Effective Date contain any untrue statement of a material fact
            or omits or will as of the Effective Date omit to state any material
            fact necessary, in light of the circumstances under which it was or
            will be made, in order to make the statements herein or therein not
            misleading;

                  (ix)  Between the Buyer Balance Sheet Date and the date
            hereof, there has not occurred with respect to Arch (A) any event or
            events (other than events which affect generally the economy or the
            industry in which Arch and MobileMedia conduct their respective
            businesses) which has had or would have a Combined Company Material
            Adverse Effect or (B) any event or events involving a regulatory or
            statutory change and affecting generally the industry in which Arch
            and MobileMedia conduct their respective business which would
            materially and adversely affect the ability of the Combined Company
            to operate its business;

                  (x)   The shares of Existing Arch Common Stock to be issued
            and distributed as contemplated by Section 1.3(e) and Section 1.6 of
            the Merger Agreement and the shares of Existing Arch Common Stock,
            the shares of Arch
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 14


            Class B Common Stock, if applicable, and the Arch Warrants to be
            issued and delivered as contemplated by Section 1 and Section 3
            above, and the Arch Warrants to be issued as contemplated by Section
            7 above, in each case when so issued and distributed or delivered,
            as the case may be, and the shares of Existing Arch Common Stock
            issued upon conversion of such shares of Arch Class B Common Stock,
            if applicable, when so converted in accordance with the Arch Charter
            Amendment, and the shares of Existing Arch Common Stock issued upon
            exercise of such Arch Warrants, when issued, paid for and delivered
            as provided in the Arch Warrant Agreement, will be duly authorized,
            validly issued, fully paid, nonassessable and free of all preemptive
            rights; and

                  (xi)  Schedule 9(a)(xi) hereto sets forth a true, complete and
            correct list of all agreements that are in effect as of the date
            hereof pursuant to which the Company has granted any registration
            rights to any person or entity (the "Existing Registration Rights
            Agreements"), and, except as specified in Schedule 9(a)(xi) hereto,
            none of the Existing Registration Rights Agreements is inconsistent
            with the rights to be granted to the Standby Purchaser pursuant to
            the Registration Rights Agreement.

            (b)   MobileMedia hereby represents and warrants to the Standby
Purchaser that:

                  (i)   MobileMedia is a corporation duly organized, validly
            existing and in good standing under the laws of the State of
            Delaware and, subject to the entry of the Confirmation Order, has
            all requisite corporate power and authority to execute, deliver and
            perform its obligations hereunder and to consummate the transactions
            contemplated hereby;

                  (ii)  Subject to the entry of the Confirmation Order, the
            execution, delivery and performance of this letter agreement by
            MobileMedia and the consummation by MobileMedia of the transactions
            contemplated hereby have been duly and validly authorized by all
            necessary corporate action on the part of MobileMedia;

                  (iii) Subject to the entry of the Confirmation Order and the
            effectiveness of the Plan, this letter agreement constitutes the
            legal, valid and binding obligation of MobileMedia, enforceable
            against MobileMedia in accordance with its terms;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 15


                  (iv)  Subject to entry of the Confirmation Order, and except
            as described in Section 2.3 of the Company Disclosure Schedule and
            except for the Applicable Requirements, the execution, delivery and
            performance of this letter agreement by MobileMedia and the
            consummation by MobileMedia of the transactions contemplated hereby
            in accordance with the terms hereof do not and will not conflict
            with, violate, or constitute a breach of any material contract,
            agreement or instrument by which MobileMedia is bound or any
            judgment, order, decree, law, statute, rule, regulation or other
            judicial or governmental restriction to which MobileMedia is
            subject;

                  (v)   Except as described in the Company Disclosure Schedule,
            the representations and warranties of MobileMedia contained in the
            Merger Agreement (other than those contained in Sections 2.6, 2.7,
            2.23 and 2.24 thereof), which representations and warranties shall
            be deemed for purposes of this clause (v) not to include any
            qualification or limitation with respect to materiality (whether by
            reference to "Company Material Adverse Effect" or otherwise), are
            true and correct, except where the matters in respect of which such
            representations and warranties are not true and correct would not
            have a Company Material Adverse Effect;

                  (vi)  True, complete and correct copies of the following
            documents are attached hereto as indicated:


                            Document                        Exhibit Hereto
            ----------------------------------------        --------------
            Merger Agreement (including all exhibits              A
            and schedules thereto)                              

            Other Standby Purchase Commitments                    C

            Company Disclosure Schedule                           J

            Agreement, dated the date hereof (the                 K
            "Debtor/Committee Agreement"), between             
            MobileMedia, on behalf of itself and the
            other Debtors, and the Committee (as
            defined in the Plan)

                  (vii) As of the date hereof, the information included in the
            Draft Proxy Statement that was provided for inclusion therein by
            MobileMedia contains no
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 16


            untrue statement of a material fact or omits to state any material
            fact necessary, in light of the circumstances under which it was
            made, in order to make the statements therein not misleading;

                  (viii) No representation or warranty of MobileMedia contained
            in this letter agreement, and no statement relating to MobileMedia
            contained in the Merger Agreement, the Company Disclosure Schedule
            or any other document, certificate, or other instrument delivered or
            to be delivered by or on behalf of MobileMedia pursuant to this
            letter agreement, contains or will as of the Effective Date contain
            any untrue statement of a material fact or omits or will as of the
            Effective Date omit to state any material fact necessary, in light
            of the circumstances under which it was or will be made, in order to
            make the statements herein or therein not misleading; and

                  (ix)  Between the Company Balance Sheet Date and the date
            hereof, there has not occurred with respect to MobileMedia (A) any
            event or events (other than events which affect generally the
            economy or the industry in which Arch and MobileMedia conduct their
            respective businesses) which has had or would have a Combined
            Company Material Adverse Effect or (B) any event or events involving
            a regulatory or statutory change and affecting generally the
            industry in which Arch and MobileMedia conduct their respective
            businesses which would materially and adversely affect the ability
            of the Combined Company to operate its business.

            (c)   The Standby Purchaser hereby represents and warrants to each
of Arch and MobileMedia that:

                  (i)   The Standby Purchaser is a corporation duly organized,
            validly existing and in good standing under the laws of the State of
            Maryland and has all requisite corporate power and authority to
            execute, deliver and perform its obligations hereunder and to
            consummate the transactions contemplated hereby;

                  (ii)  The execution, delivery and performance of this letter
            agreement by the Standby Purchaser and the consummation by the
            Standby Purchaser of the transactions contemplated hereby have been
            duly and validly authorized by all necessary corporate action on the
            part of the Standby Purchaser;

                  (iii) This letter agreement constitutes the legal, valid and
            binding obligation of the Standby Purchaser, enforceable against the
            Standby Purchaser in accordance with its terms;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 17


                  (iv)  Except for the Applicable Requirements, the execution,
            delivery and performance of this letter agreement by the Standby
            Purchaser and the consummation by the Standby Purchaser of the
            transactions contemplated hereby in accordance with the terms hereof
            do not and will not conflict with, violate or constitute a breach of
            any material contract, agreement, or instrument by which the Standby
            Purchaser is bound or any judgment, order, decree, law, statute,
            rule, regulation or other judicial or governmental restriction to
            which the Standby Purchaser is subject, except where such conflicts,
            violations or breaches, individually or in the aggregate, would not
            have a material adverse effect on the ability of the Standby
            Purchaser to consummate the transactions contemplated hereby;

                  (v)   No representation or warranty of the Standby Purchaser
            contained in this letter agreement, and no statement contained in
            any other document, certificate or other instrument delivered or to
            be delivered by or on behalf of the Standby Purchaser pursuant to
            this letter agreement, contains or will as of the Effective Date
            contain any untrue statement of a material fact or omits or will as
            of the Effective Date omit to state any material fact necessary, in
            light of the circumstances under which it was or will be made, in
            order to make the statements herein or therein not misleading; and

                  (vi)  As of the date hereof, the Standby Purchaser holds the
            aggregate stated principal amount of 9 3/8% Notes and 10 1/2% Notes
            (as such terms are defined in the Plan) indicated under the Standby
            Purchaser's name and address on Annex I hereto.

            (d)   None of the representations and warranties made herein or in
any certificate to be delivered as contemplated hereby will survive the Closing.

      10.   Certain Covenants. (a) Each of Arch and MobileMedia (i) acknowledges
that the Debtors have agreed to provide to the Committee copies of any and all
notices, documents or information to be provided by or made available by the
Debtors to Arch pursuant to the Merger Agreement or provided by or made
available by Arch to the Debtors pursuant to the Merger Agreement, promptly
after the receipt or provision thereof by or to the Debtors, as applicable, and
that the Committee, pursuant to the undertaking attached as Annex II hereto, has
agreed to distribute copies of the same to the Standby Purchaser and to take
certain other actions and (ii) agrees that the Committee may do so.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 18


            (b)   Without limiting the generality of the foregoing clause (a) of
this Section 10, Arch will, before filing the Registration Statement with the
SEC, furnish to the Standby Purchaser and its counsel copies of the Registration
Statement (including all exhibits thereto) proposed to be filed, will provide
the Standby Purchaser and its counsel a reasonable opportunity to review and
comment on such Registration Statement and will not file such Registration
Statement if the Standby Purchaser shall reasonably object thereto within three
calendar days after the receipt thereof.

            (c)   Arch will deliver to the Standby Purchaser copies of the
definitive Proxy Statement in the form filed with the SEC and mailed to
Stockholders of Arch and the Registration Statement in the form declared
effective by the SEC.

            (d)   Without limiting the generality of the foregoing clause (a) of
this Section 10, Arch will, before filing the Shelf Registration Statement or
any pre-effective amendment thereto, furnish to the Standby Purchaser and its
counsel copies of the Shelf Registration Statement or such pre-effective
amendment thereto, as applicable, proposed to be filed, will provide Standby
Purchaser and its counsel with a reasonable opportunity to review and comment on
the Shelf Registration Statement or such pre-effective amendment thereto, as
applicable, and will not file the Shelf Registration Statement or such
pre-effective amendment thereto, as applicable, to which the Standby Purchaser
or its counsel shall reasonably object within three business days after the
receipt thereof. The Standby Purchaser will furnish to Arch such information
regarding the Standby Purchaser and its plan and method of distribution of the
Registrable Securities as Arch may reasonably request in writing in connection
with the preparation of the Shelf Registration Statement.

            (e)   Each of Arch, MobileMedia and the Standby Purchaser will use
its reasonable best efforts to obtain all approvals, waivers, consents and other
authorizations required by the Applicable Requirements, including without
limitation the applicable requirement of the HSR Act, necessary in connection
with the performance of this letter agreement by the Standby Purchaser and the
consummation by the Standby Purchaser of the transactions contemplated hereby.

            (f)   Arch will, as requested by the Standby Purchaser, either pay
directly to the appropriate Governmental Entity, on behalf of the Standby
Purchaser, or reimburse the Standby Purchaser for, any fees required to be paid
by the Standby Purchaser in connection with its compliance with the applicable
requirements of the HSR Act. In addition, following the Effective Date, Arch
will reimburse, promptly upon written request (accompanied by appropriate
supporting documentation), costs and expenses (including without limitation
reasonable fees and expenses of legal counsel, including a reasonable allocation
with respect to the cost of any internal
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 19


counsel), incurred by the Standby Purchaser in connection with this letter
agreement and the transactions contemplated hereby; provided, however, the
reimbursable costs and expenses of the Affiliated Standby Purchasers shall not
exceed $100,000 in the aggregate.

      11.   Certain Prohibited Transactions. The Standby Purchaser hereby
covenants that, from and after the date hereof, so long as its commitment
hereunder remains in effect, it will not sell, or enter into any agreement
relating to the sale (including without limitation any short sale, equity swap
or other hedge position) of, any shares of Arch capital stock or, except as
otherwise expressly contemplated by this Section 11, engage in any other
disposition of such shares that might negatively affect the market price of such
shares; provided, however, that the foregoing provision will not apply to any
agreement entered into prior to the date hereof (if not entered into in
contemplation of the transactions contemplated by the Plan, the Merger Agreement
or this letter agreement) or any transaction effected pursuant to the terms
thereof. Notwithstanding the immediately preceding sentence, but subject to
Section 3 above and Section 12 below, the Standby Purchaser may at any time, as
it may determine in its sole and absolute discretion, sell or otherwise
transfer, or acquire, or enter into any agreement relating to the sale, transfer
or acquisition of, Rights or Unsecured Claims. The Standby Purchaser
acknowledges that it has received copies of the Rights Agreement and the
amendment thereto attached as Exhibit D to the Merger Agreement (the "Rights
Plan Amendment"). Arch hereby covenants that it will not, without the prior
written consent of the Standby Purchaser, further amend the Rights Agreement in
any manner that would eliminate or reduce the ownership thresholds applicable to
the Standby Purchaser thereunder; provided, however, that this sentence shall
cease to be of any further force or effect at such time after the Effective Date
as the Standby Purchaser ceases to beneficially own in the aggregate at least
10.0% of the outstanding shares of Existing Arch Common Stock.

      12.   Voting Agreement. The Standby Purchaser hereby covenants that (a) so
long as the Bankruptcy Court approves the Disclosure Statement not later than
December 31, 1998 and the Confirmation Order is entered not later than March 31,
1999, (i) it will vote, or cause to be voted, for the acceptance of the Plan all
Unsecured Claims held by it on the date fixed for determining holders of
Unsecured Claims entitled to vote for acceptance or rejection of the Plan (the
"Record Date"), (ii) it will not withdraw or otherwise revoke, or cause to be
withdrawn or otherwise revoked, such vote for the acceptance of the Plan, and
(iii) it will not grant, or cause to be granted, to any other person or entity
any proxy to vote with respect to any such Unsecured Claims (other than a proxy
to vote for the acceptance of the Plan) and (b) except with respect to accounts
which cease to be within the Standby Purchaser's control and investment funds
which cease to be under its management, it will not, on or prior to the Record
Date, sell or otherwise transfer any Unsecured Claims held by it unless the
transferee shall have agreed in writing in the form attached as Annex III hereto
(i) to vote for the acceptance of the Plan with respect to such Unsecured Claims
and (ii) not to sell or otherwise transfer such Unsecured Claims unless its
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 20


transferee shall agree to be bound in the same manner provided in this clause
(b) with respect to such Unsecured Claims.

      13.   Other Standby Purchase Commitments. (a) Each of Arch and MobileMedia
covenants that it will not agree to any amendment or modification to any of the
letter agreements, dated the date hereof, among Arch, MobileMedia and any of the
Other Standby Purchasers (the "Other Standby Purchase Commitments"), without the
prior written consent of the Standby Purchaser. Notwithstanding the immediately
preceding sentence, Arch and MobileMedia may, without the prior written consent
of the Standby Purchaser, agree to an amendment or modification to any of the
Other Standby Purchase Commitments to the extent that (i) such amendment or
modification has the sole effect of reducing or eliminating the financial
commitment thereunder and (ii) simultaneously therewith, a qualified
institutional buyer (as such term is defined in Rule 144A promulgated under the
Securities Act) reasonably acceptable to the Standby Purchaser makes a
commitment in a corresponding amount on terms identical in all material respects
to those set forth in such Other Standby Purchase Commitment.

            (b)   The Standby Purchaser will have no liability for the
commitment of any Other Standby Purchaser under any Other Standby Purchase
Commitments or the commitment of any other person contemplated by Section 13(a)
above.

      14.   Certain Notices; Certain Information. (a) Each of Arch and
MobileMedia hereby covenants that it will promptly deliver to the Standby
Purchaser, and the Standby Purchaser hereby covenants that it will promptly
deliver to Arch and MobileMedia, written notice of any matter, event or
development that would (i) render any representation or warranty made by it
herein inaccurate or incomplete in any respect or (ii) constitute or result in a
breach by it of, or a failure by it to comply with, any covenant herein
applicable to it.

            (b)   Each of Arch and MobileMedia will furnish the Standby
Purchaser with such information regarding itself as the Standby Purchaser may
reasonably request.

      15.   Certain Consent Rights. (a) Notwithstanding anything to the contrary
herein contained, except as expressly contemplated by the Merger Agreement or
the Plan, Arch hereby covenants that it will not take, or agree in writing to
take, any action contemplated by Section 4.5(b)(ii), (iii), (iv), (viii) or (ix)
of the Merger Agreement without the prior written consent of the Standby
Purchaser.

            (b)   Arch hereby covenants that, without the prior written consent
of the Standby Purchaser, it will not, prior to the Effective Date, enter into
any agreement with respect to its securities, or amend any existing agreement
with respect to its securities (including without 
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 21


limitation the Existing Registration Rights Agreements) in any manner
inconsistent with the rights to be granted to the Standby Purchaser pursuant to
the Registration Rights Agreement.

      16.   Removal of Legends. In the event that, following the transactions
contemplated by the Merger Agreement, the Plan and this letter agreement, any
certificates evidencing securities ("Certificates") of Arch held by the Standby
Purchaser bear a restrictive legend then:

            (a)   if the Standby Purchaser delivers to Arch (i) a certificate,
      in a form reasonably satisfactory to Arch, certifying that securities
      evidenced by such Certificate have been transferred pursuant to a
      registration statement that is effective under the Securities Act or (ii)
      a certificate, in a form reasonably satisfactory to Arch, certifying that
      securities evidenced by such Certificate have been transferred without
      registration in accordance with the requirements of Rule 144 under the
      Securities Act, Arch will, or will instruct its transfer agent to, issue
      upon surrender of such Certificate one or more new Certificates evidencing
      the securities so transferred evidenced by the Certificate so surrendered,
      which new Certificate or Certificates will not bear any such legend; and

            (b)   if the Standby Purchaser delivers to Arch an opinion of
      counsel to the Standby Purchaser (which may be internal counsel to the
      Standby Purchaser) that, in the opinion of such counsel, such legend is
      not, or is no longer, required to ensure compliance with the Securities
      Act, Arch will, or will instruct its transfer agent to, issue upon
      surrender of such Certificate one or more new Certificates evidencing the
      securities evidenced by the Certificate so surrendered, which new
      Certificate or Certificates will not bear any such legend. 

                                   * * * * *

      If you are in agreement with the foregoing, please execute the enclosed
copy of this letter agreement as indicated and return it to the undersigned.
This letter agreement will become effective upon (i) the delivery to us of
executed counterparts of this letter agreement by each of you and (ii) the
execution and delivery of each of the Other Standby Purchase Commitments by each
of the parties thereto. Once effective, this letter agreement will terminate on
(i) the date on which the Debtor Tower Agreement is terminated, unless prior to
or simultaneously with such termination, MobileMedia shall have entered into a
definitive agreement which shall be comparable in form and substance to the
Debtor Tower Agreement and a copy of which shall be delivered to the Standby
Purchaser promptly following execution thereof, with a bona fide third-party
purchaser providing for a sale to such third party of the assets or
substantially all of the assets to be sold to Pinnacle pursuant to the Debtor
Tower Agreement resulting in net proceeds 
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 22


to MobileMedia of not less than $165.0 million (an "Acceptable Sale"), (ii)
December 31, 1998, unless the Closing (as defined in the Debtor Tower Agreement)
or the closing of an Acceptable Sale shall have occurred on or before such date,
(iii) March 31, 1999, unless the Confirmation Order shall have been entered by
the Bankruptcy Court on or before such date, (iv) June 30, 1999, unless the
effectiveness of the Plan occurs on or before such date, or (v) if not
theretofore terminated pursuant to one of the foregoing clauses, the date on
which the Merger Agreement is terminated in accordance with the terms thereof.


      All notices and other communications hereunder must be in writing. Any
notice or other communication hereunder will be deemed duly delivered three
business days after it is sent by registered or certified mail, return receipt
requested, postage prepaid, or two business days after it is sent via a
reputable international overnight courier service, in each case to the intended
recipient at the address therefor set forth on the signature page hereto. Any
party hereto may give any notice or other communication hereunder by personal
delivery or telecopy, but no such notice or other communication will be deemed
to have been duly given unless and until it actually is received by the party
for whom it is intended. Any party may change the address to which notices and
other communications hereunder are to be delivered by giving the other parties
notice in the manner herein set forth.

      This letter agreement represents the final agreement among the parties
hereto with respect to the subject matter hereof and may not be contradicted by
evidence of prior or contemporaneous agreements of the parties. There are no
unwritten oral agreements between the parties relating to the subject matter
hereof. This letter agreement may not be amended or modified except by a written
instrument signed by each of the Standby Purchaser, Arch and MobileMedia.

      This letter agreement shall be governed by and construed in accordance
with the laws of the State of Delaware without regard to its principles of
conflicts of law.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 23


      This letter agreement may be executed in counterparts which, taken
together, shall constitute one and the same instrument.

                                       Very truly yours,                        
                                       
                                       Northwestern Mutual Series Fund, Inc.
                                       for the High Yield Bond Portfolio
                                       
                                       
                                       By:
                                          --------------------------------------
                                       Name: Timothy S. Collins
                                       Its:  Vice President
                                       
                                       Address: c/o The Northwestern Mutual Life
                                                Insurance Company
                                                720 E. Wisconsin Avenue
                                                Milwaukee, Wisconsin 53202
                                                Attention: Securities Department

ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.


By:
   --------------------------------------
Name:
     ------------------------------------
Its:
    -------------------------------------

Address: 1800 West Park Drive, Suite 250
         Westborough, MA  01581
         Attn: Chairman and Chief
               Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA  02109
               Attn: Jay E. Bothwick
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 24



Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.


By:
   --------------------------------------
Name:
     ------------------------------------
Its:
    -------------------------------------

Address:      Fort Lee Executive Park
              One Executive Drive, Suite 500
              Fort Lee, NJ 07024
              Attn:  Chairman - Restructuring

With copy to: Sidley & Austin
              875 Third Avenue, Suite 1400
              New York, New York 10022
              Attn:  James D. Johnson
<PAGE>


                                                                         ANNEX I
                                                                         -------

                               COMMITMENT AMOUNTS
                               ------------------
                              (dollars in millions)
<TABLE>
<CAPTION>
                                                        Column A                Column B               Column C           Column D
                                                        --------                --------               --------           --------

                                                     Rights Exercise       Unexercised Rights            Total
                                                       Commitment              Commitment             Commitment         Commitment
Name and Address of Standby Purchasers                 Amount (1)              Amount (2)               Amount           Percentage
- --------------------------------------                ------------            ------------             --------         -----------
<S>                                                       <C>                    <C>                    <C>                <C>   
W.R. Huff Asset Management Co., L.L.C., as                $39.27                 $35.80                 $75.07             34.60%
   agent for its affiliates and discretionary                                                        
   accounts                                                                                          
67 Park Place, 9th Floor                                                                             
Morristown, New Jersey  07960                                                                        
Stated Principal Amount of 9 3/8% Notes:                                                             
$ 57,847,000                                                                                         
Stated Principal Amount of 10 1/2% Notes:                                                            
$ 27,970,000                                                                                         
                                                                                                     
The Northwestern Mutual Life Insurance                    $10.95                  $9.97                 $20.92              9.64%
   Company*                                                                                          
720 East Wisconsin Avenue                                                                            
Milwaukee, Wisconsin  53202                                                                          
Stated Principal Amount of 9 3/8% Notes:                                                             
$ 19,776,000                                                                                         
Stated Principal Amount of 10 1/2% Notes:                                                            
$  3,350,000                                                                                         
                                                                                                     
The Northwestern Mutual Life Insurance                     $2.65                  $2.42                  $5.07              2.34%
   Company for its Group Annuity Separate                                                      
   Account*
720 East Wisconsin Avenue
Milwaukee, Wisconsin  53202
Stated Principal Amount of 9 3/8% Notes:
$     -0-
Stated Principal Amount of 10 1/2% Notes
$  7,000,000
</TABLE>

- ----------

* The Northwestern Mutual Life Insurance Company, The Northwestern Mutual Life
Insurance Company for its Group Annuity Separate Account and Northwestern Mutual
Series Fund, Inc. for the High Yield Bond Portfolio are affiliated entities for
purposes of clauses (a) and (k) of Section 5 and clause (iii) of Section 6.
<PAGE>

                               COMMITMENT AMOUNTS
                               ------------------
                              (dollars in millions)
<TABLE>
<CAPTION>
                                                           Column A                Column B              Column C          Column D
                                                           --------                --------              --------          --------

                                                        Rights Exercise       Unexercised Rights           Total
                                                          Commitment              Commitment            Commitment        Commitment
Name and Address of Standby Purchasers                    Amount (1)              Amount (2)              Amount          Percentage
- --------------------------------------                   ------------            ------------            --------        -----------
<S>                                                          <C>                    <C>                   <C>               <C>   
Northwestern Mutual Series Fund, Inc. for the                   $.75                   $.69               $1.44              0.66%
   High Yield Bond Portfolio*                                                                       
720 East Wisconsin Avenue                                                                           
Milwaukee, Wisconsin  53202                                                                         
Stated Principal Amount of 9 3/8% Notes:                                                            
$     -0-                                                                                           
Stated Principal Amount of 10 1/2% Notes:                                                           
$  2,000,000                                                                                        
                                                                                                    
Credit Suisse First Boston Corporation                        $29.48                 $26.88              $56.36             25.97%
11 Madison Avenue, 4th Floor                                                                        
New York, New York 10010                                                                            
Stated Principal Amount of 9 3/8% Notes:                                                            
$ 32,453,000                                                                                        
Stated Principal Amount of 10 1/2% Notes:                                                           
$ 35,930,000                                                                                        
                                                                                                    
Whippoorwill Associates, Inc., as general partner             $30.42                 $27.72              $58.14             26.79%
   and/or agent for the parties set forth on                                                        
   Schedule A hereto in the percentages noted                                                       
   thereon                                                                                          
11 Martine Avenue                                                                                   
White Plains, New York 10606                                                                        
Stated Principal Amount of 9 3/8% Notes:                                                            
$ 37,855,000                                                                                        
Stated Principal Amount of 10 1/2% Notes:                                                           
$ 31,410,000                                                                                        
                                                Total:       $113.52                $103.48             $217.00            100.00%
                                                             -------                -------             -------
</TABLE>

- ----------

(1)   The "Rights Exercise Commitment Amount", for each Standby Purchaser, shall
      mean an amount equal to the product of (i) the Rights Subscription Price
      (as defined in Schedule II to the Merger Agreement) and (ii) the number of
      Rights issuable in respect of an amount of Allowed Unsecured Claims
      derived from the principal amount of 9 3/8% Notes and the 10 1/2% Notes
      indicated under the Standby Purchaser's name on this Annex I held by such
      Standby Purchaser on the date hereof. The dollar amounts set forth under
      Column A are estimates provided for illustrative purposes only, based on
      the assumptions that (x) there is a total of $475 million of Allowed
      Unsecured Claims, (y) there is no Rights Reserve (as defined in the Plan)
      and (z) the aggregate amount of Subordinated Noteholder Claims (as defined
      in the Plan) is $441,819,762.

(2)   The "Unexercised Rights Commitment Amount", for each Standby Purchaser,
      shall mean an amount equal to (i) the Total Commitment Amount indicated in
      Column C for such Standby Purchaser less (ii) the Rights Exercise
      Commitment Amount for such Standby Purchaser. The dollar amounts set forth
      under Column B are estimates provided for illustrative purposes only,
      based on the estimates set forth in Column A.
<PAGE>

                                                                        ANNEX II
                                                                        --------


                                   UNDERTAKING
                                   -----------

            The Committee hereby undertakes to distribute to the Standby
Purchaser (until instructed by the Standby Purchaser to do otherwise) copies of
any and all notices, documents or information to be provided by or made
available by the Debtors to Arch pursuant to the Merger Agreement or provided by
or made available by Arch to the Debtors pursuant to the Merger Agreement that
are received by the Committee pursuant to the Debtor/Committee Agreement as soon
as practicable with its receipt thereof. The Committee hereby further undertakes
to consult with the Standby Purchaser (until instructed by the Standby Purchaser
to do otherwise) prior to delivering any written consent or exercising any other
right of the Committee (other than the distribution of notices, documents or
information to the Standby Purchaser or the Other Standby Purchasers) pursuant
to the Debtor/Committee Agreement or the Plan. The Committee will not enter into
any amendment to the Debtor/Committee Agreement without the prior written
consent of the Standby Purchaser.

                                       THE OFFICIAL COMMITTEE
                                       OF UNSECURED CREDITORS


                                       By:
                                          --------------------------------------

                                       Its:
                                           -------------------------------------
<PAGE>

                                                                       ANNEX III
                                                                       ---------


                                VOTING AGREEMENT
                                ----------------

      The undersigned transferee of indebtedness of MobileMedia Corporation or
one of its direct or indirect subsidiaries (collectively, "MobileMedia")
described in Schedule A attached hereto (the "Claim"), hereby acknowledges and
agrees as follows:

      1.    MobileMedia is a debtor-in-possession under Chapter 11 of the
            Bankruptcy Code and has proposed a First Amended Joint Plan of
            Reorganization dated August __, 1998 (the "Amended Plan").

      2.    By acquiring the Claim the undersigned may also acquire rights to
            vote on the adoption of the Amended Plan.

      3.    As a condition of the transfer of the Claim, the undersigned hereby
            agrees to exercise all voting rights it may have as holder of the
            Claim in favor of the Amended Plan unless the Amended Plan shall
            have been withdrawn.

      4.    The undersigned agrees that it shall not subsequently transfer the
            Claim or any portion thereof unless and until it obtains from its
            transferee a Voting Agreement identical to the form hereof.

      IN WITNESS HEREOF, the undersigned transferee has executed this Voting
Agreement this _____ day of __________, 199_.

                                         [TRANSFEREE]                           
                                         
                                         
                                         By:
                                            ------------------------------------
                                            Title:


Accepted By:


- -------------------------
[Transferor]
<PAGE>

                                   SCHEDULE A
                                       TO
                                VOTING AGREEMENT


[Describe Claim.]

<PAGE>

                                                               SCHEDULE 9(a)(xi)
                                                               -----------------

Existing Registration Rights Agreement
- --------------------------------------

(1)   Registration Rights Agreement, dated as of June 24, 1998, by and among
      Arch Communications Group, Inc., Sandler Capital Partner, 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, as amended

(2)   Registration Rights Agreement, dated as of June 29, 1998, Arch
      Communications Group, Inc. Adelphia Communications Corporation and
      Lisa-Gaye Shearing

Inconsistencies:
- ----------------

The provisions of the Registration Rights Agreement listed at (2) above are
inconsistent in certain respects with the provisions of the Registration Rights
Agreement.
<PAGE>

                                                                       Exhibit H
                                                                       ---------


                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
                     for its Group Annuity Separate Account
                            720 East Wisconsin Avenue
                           Milwaukee, Wisconsin 53202


                                 August 18, 1998



Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts  01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey  07024

               Re:    Commitment to Purchase Stock and Warrants
                      -----------------------------------------

Gentlemen:

        Arch Communications Group, Inc., a Delaware corporation ("Arch"), and
MobileMedia Communications, Inc., a Delaware corporation ("MobileMedia"), intend
to engage in a business combination transaction (the "Combination") as part of a
reorganization (the "Reorganization") of MobileMedia, MobileMedia Corporation,
the sole stockholder of MobileMedia ("Parent"), and all of MobileMedia's
subsidiaries (collectively, the "Debtors") pursuant to chapter 11 of title 11,
United States Code, 11 U.S.C. ss.ss. 101 et seq. (the "Bankruptcy Code"). It is
our understanding that in connection with the Reorganization, among other
things: (a) pursuant to the Agreement and Plan of Merger, dated as of the date
hereof (as amended by the First Amendment thereto dated as of September 3, 1998
(the "Merger Agreement"), among Arch, a wholly owned subsidiary of Arch ("Merger
Sub"), Parent and MobileMedia, MobileMedia will merge with and into Merger Sub,
with Merger Sub continuing as the surviving corporation and a wholly owned
subsidiary of Arch; (b) pursuant to the Merger Agreement, Arch will make
available for distribution pursuant to a plan of reorganization of the Debtors
in the form attached as Exhibit A to the Merger Agreement, with such amendments
and modifications thereto as are made in a manner consistent with clause (e) of
Section 5 hereto (such plan of reorganization being referred to herein as the
"Plan"), (i) cash, (ii) shares of its Common Stock, par value $.01 per share
("Existing Arch Common Stock"), and (iii) either (A) if a Rights Offering
Adjustment (as defined in Schedule II to the Merger Agreement) shall not have
occurred, warrants entitling the holders thereof to purchase shares of Existing
Arch Common Stock ("Arch Warrants"), with such Arch Warrants to be issued
pursuant to, and to have the terms set forth in, a warrant agreement in
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2


the form attached as Exhibit B to the Merger Agreement (the "Arch Warrant
Agreement") or (B) if a Rights Offering Adjustment shall have occurred, warrants
entitling the holders thereof to purchase shares of Existing Arch Common Stock
("Arch Participation Warrants"), with such Arch Participation Warrants to be
issued pursuant to, and to have the terms set forth in, a warrant agreement in
the form attached as Exhibit B-1 to the Merger Agreement (the "Arch
Participation Warrant Agreement"); (c) holders of unsecured non-priority claims
against the Debtors ("Unsecured Claims"), to the extent such Unsecured Claims
are Allowed (as defined in the Plan), will receive pursuant to the Plan (i)
shares of Existing Arch Common Stock and (ii) rights to purchase ("Rights") for
cash either (A) if a Rights Offering Adjustment shall not have occurred, units
("Units") consisting of (x) shares of Existing Arch Common Stock and (y) Arch
Warrants or (B) if a Rights Offering Adjustment shall have occurred, shares of
Existing Arch Common Stock ("Rights Shares"); (d) holders of claims arising
under or relating to the Credit Agreement, dated December 4, 1995, as amended,
among MobileMedia and the other parties thereto ("Secured Claims"), to the
extent such Secured Claims are Allowed, will receive pursuant to the Plan cash
in an amount equal to 100% of such claims; (e) all of the outstanding equity
interests in MobileMedia and Parent will be canceled without consideration and
Parent will be dissolved; and (f) the commitments under the DIP Loan Agreement
will terminate and all amounts owed under or in respect of the DIP Loan
Agreement will be paid in full in cash. Arch will conduct the Stockholder Rights
Offering, in which it will issue to holders of Buyer Stock Stockholder Rights to
acquire shares of Existing Arch Common Stock if a Rights Offering Adjustment
shall have occurred, and, in addition, if a Rights Offering Adjustment shall
have occurred, immediately following the Combination, Arch will issue Arch
Participation Warrants to the stockholders of Arch to the extent any Stockholder
Rights issued to such Stockholder Rights Holder were not exercised.

        Terms used herein with initial capital letters that are not otherwise
defined shall have the meanings ascribed to such terms in the Merger Agreement.

        1. The Commitment. In connection with the foregoing, The Northwestern
Mutual Life Insurance Company for its Group Annuity Separate Account (the
"Standby Purchaser") hereby advises you of its commitment (the "Commitment"),
subject to the conditions set forth herein:

               (a) to exercise any Rights distributed to it in respect of its
        Allowed Unsecured Claims in accordance with the Plan and not thereafter
        sold or transferred as permitted by Section 3 below to purchase either
        (i) if a Rights Offering Adjustment shall not have occurred, Units or
        (ii) if a Rights Offering Adjustment shall have occurred, Rights Shares,
        to the extent that the aggregate purchase price payable upon such
        exercise, as determined in accordance with Schedule II to the Merger
        Agreement (the "Subscription Price"), does not exceed the Rights
        Exercise Commitment Amount of the Standby Purchaser as set forth in
        Annex I hereto;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3


               (b) if (i) the Standby Purchaser sells or otherwise transfers any
        or all of the (A) the Rights distributed to it in accordance with the
        Plan or (B) Unsecured Claims held by it as of the date hereof in respect
        of which Rights are to be distributed, in each case as permitted by
        Section 3 below, and (ii) the Rights sold or transferred by the Standby
        Purchaser or the Rights distributed in respect of Unsecured Claims held
        by it as of the date hereof that are hereafter sold or transferred by
        the Standby Purchaser are not exercised prior to the expiration thereof
        (at which time such Rights will be void and will no longer be
        exercisable), to purchase for cash (based upon the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, identical Units or (y) if a Rights
        Offering Adjustment shall have occurred, Rights Shares underlying, in
        each case, such unexercised Rights, to the extent that the aggregate
        purchase price therefor, together with the aggregate Subscription Price
        payable upon exercise of Rights exercised as contemplated by clause (a)
        above, does not exceed the Rights Exercise Commitment Amount of the
        Standby Purchaser as set forth in Annex I hereto; and

               (c) if any Rights distributed in accordance with the Plan (other
        than (i) Rights distributed to the Standby Purchaser or the other
        holders of Unsecured Claims listed on Annex I hereto (the "Other Standby
        Purchasers") and retained by them (which Rights are referred to in
        Section 1(a) above and Section 1(a) of each of the Other Standby
        Purchase Commitments (as defined in Section 13(a) below)) or (ii)
        subject to Section 3(b) below, Rights distributed in respect of
        Unsecured Claims held by the Standby Purchaser or the Other Standby
        Purchasers as of the date hereof that are hereafter sold or transferred
        by them (which Rights are referred to in Sections 1(b) and 3 hereof and
        Sections 1(b) and 3 of each of the Other Standby Purchase Commitments))
        remain unexercised upon the expiration thereof (at which time such
        Rights will be void and will no longer be exercisable), to purchase for
        cash (based on the Subscription Price payable upon exercise of such
        Rights ) pro rata in accordance with and up to the Unexercised Rights
        Commitment Amount of the Standby Purchaser as set forth in Annex I
        hereto either (x) if a Rights Offering Adjustment shall not have
        occurred, identical Units or (y) if a Rights Offering Adjustment shall
        have occurred, Rights Shares, underlying, in each case, such unexercised
        Rights.

        2. Arch Class B Common Stock. Notwithstanding anything to the contrary
herein contained, if the purchases by the Standby Purchaser contemplated by
Section 1 above would cause the Standby Purchaser, the Other Standby Purchasers,
and any other persons or entities who, when taken together with any one or more
of the Standby Purchaser and the Other Standby Purchasers, would constitute a
"person" or "group" as used in Section 13(d) or Section 14(d) of the Exchange
Act or Rule 13d-3 or Rule 13d-5 promulgated thereunder, or any "affiliate" as
defined in Rule 405 promulgated under the Securities Act of any of them
(collectively, the "Standby Class B Holders"), in the aggregate, to beneficially
own on the effective date of the Plan (the "Effective Date") shares representing
more than 49.0% of the capital stock of Arch generally
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4


entitled to vote in the election of directors or more than 49.0% of the total
voting power of the capital stock of Arch, Arch will substitute shares of Class
B Common Stock, par value $.01 per share, of Arch ("Arch Class B Common Stock"),
with such Arch Class B Common Stock having the terms set forth in the form of
Certificate of Amendment to Certificate of Incorporation of Arch attached as
Exhibit F to the Merger Agreement (the "Arch Charter Amendment"), for shares of
Existing Arch Common Stock so purchased on a one-for-one basis such that on the
Effective Date the Standby Class B Holders, in the aggregate, will beneficially
own shares representing not more than 49.0% of the capital stock of Arch
generally entitled to vote in the election of directors and not more than 49.0%
of the total voting power of the capital stock of Arch, all as provided in the
Plan. For purposes of this letter agreement, "beneficial ownership" shall be
determined as provided in Rule 13d-3 and Rule 13d-5 promulgated under the
Exchange Act, except that a person or entity shall be deemed to have "beneficial
ownership" of all securities that such person or entity has the right to
acquire, whether such right is exercisable immediately or only after the passage
of time.


               (a) For purposes of calculating the percentages referred to in
Section 2(a) above, it will be assumed that no additional Unsecured Claims are
allowed after the Effective Date and all of the shares of Existing Arch Common
Stock in the Creditor Stock Pool (as defined in the Plan) are distributed in
accordance with the Plan to the holders of Allowed Unsecured Claims as of the
Effective Date.

               (b) Substitution of shares of Class B Common Stock as
contemplated by Section 2(a) above will be effectuated as follows:

                      (i) first, to the extent that the Standby Purchaser or any
               Other Standby Purchaser beneficially owns shares of Existing Arch
               Common Stock as of the Effective Date, other than those acquired
               as contemplated by the Plan, the Merger Agreement, this letter
               agreement and the Other Standby Purchase Commitments ("Non-Plan
               Arch Shares"), among the Standby Purchaser and such Other Standby
               Purchaser pro rata based on ownership of Non-Plan Arch Shares up
               to an amount equal to the aggregate number of Non-Plan Arch
               Shares beneficially owned by them as of the Effective Date; and

                      (ii) second, if necessary, among the Standby Purchaser and
               the Other Standby Purchasers in accordance with the percentages
               set forth in Column D of Annex I hereto.

               (c) The Standby Purchaser hereby disclaims beneficial ownership
of any securities of Arch owned by the Other Standby Purchasers.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5


        3. Certain Transfer Restrictions. (a) Subject to Section 12 below, the
Standby Purchaser may (i) sell or otherwise transfer any or all of (A) the
Rights distributed to it in accordance with the Plan or (B) Unsecured Claims in
respect of which Rights are to be distributed or (ii) purchase or otherwise
acquire (A) Rights distributed to others in accordance with the Plan or (B)
Unsecured Claims in respect of which Rights are to be distributed; provided,
however, that, with respect to clause (i) of this sentence, (X)
contemporaneously with the consummation of any such sale or other transfer of
Rights or Unsecured Claims, the Standby Purchaser will notify Arch and
MobileMedia of the occurrence thereof and (Y) the Standby Purchaser will not
consummate any such sale or other transfer unless the transferee or transferees
of such Rights or Unsecured Claims shall have entered into a written agreement
(a "Tracking Agreement") (I) to notify the Standby Purchaser, Arch and
MobileMedia of any subsequent transfer by it of such Rights or Unsecured Claims
or any Rights distributed to it in respect of such Unsecured Claims and (II) not
to sell or otherwise transfer such Rights or Unsecured Claims or Rights
distributed to it in respect of such Unsecured Claims, unless its transferee or
transferees shall agree in writing to be bound in the same manner provided in
this clause (Y) with respect to any subsequent transfer by it.

        (b) Notwithstanding the provisions of clause (Y) of the proviso in
Section 3(a) above, the Standby Purchaser may elect to sell or otherwise
transfer (i) any or all of the Rights distributed to it in accordance with the
Plan or (ii) Unsecured Claims in respect of which Rights are to be so
distributed, in either case without entering into a Tracking Agreement with its
transferee or transferees (any Rights so transferred and any Rights distributed
in respect of Allowed Claims so transferred, together with any Rights so
transferred and any Rights distributed in respect of Allowed Claims so
transferred by the Other Standby Purchasers pursuant to Section 3(b) of the
Other Standby Purchase Commitments, being referred to herein collectively as
"Untracked Rights"). Any Rights that remain unexercised upon expiration thereof
will be deemed to be "Section 3(b) Rights" up to, but not exceeding, the amount
of Untracked Rights. The Section 3(b) Rights shall be exercised as follows prior
to the application of Section 1(c) above and Section 1(c) of the Other Standby
Purchase Commitments: (A) the Standby Purchaser and the Other Standby Purchasers
will first be given the opportunity to purchase for cash (based on the
Subscription Price payable upon exercise of such Rights) either (x) if a Rights
Offering Adjustment shall not have occurred, Units or (y) if a Rights Offering
Adjustment shall have occurred, Rights Shares, underlying, in each case, a
number of unexercised Rights up to the amount of Section 3(b) Rights in
accordance with the percentages set forth in Column D of Annex I hereto and (B)
to the extent such Units or Rights Shares, as the case may be, are not so
purchased, the Standby Purchaser and any Other Standby Purchasers that are
responsible for the existence of the Section 3(b) Rights will be required to
purchase such Units or Rights Shares, as the case may be, pro rata based on the
number of Section 3(b) Rights resulting from their respective transfers. Nothing
in this Section 3(b) will in any way reduce the commitment of the Standby
Purchaser specified in Section 1(c) above or the Unexercised Rights Commitment
Amount as set forth in Annex I hereto.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6


        4. The Closing.(a) Notwithstanding anything to the contrary herein
contained or the terms of the Rights or the Plan, subject to the conditions set
forth herein, on the Effective Date the Standby Purchaser, in satisfaction of
the Commitment, will deliver at the Closing (i) the aggregate Subscription Price
payable upon exercise of any Rights exercised by it and (ii) the purchase price
payable in consideration of any shares of Existing Arch Common Stock or, if
applicable, Arch Class B Common Stock and, if a Rights Offering Adjustment shall
not have occurred, Arch Warrants to be otherwise purchased by it pursuant to the
Commitment; provided, however, that, if requested by the Standby Purchaser in
writing at least two business days prior to the Effective Date, any cash to be
distributed to the Standby Purchaser in respect of Allowed Secured Claims
pursuant to the Plan will, prior to the distribution thereof pursuant to the
Plan and in accordance with the instructions included in such written request,
be first applied, on behalf of the Standby Purchaser, to the payment of such
amounts payable on the Effective Date as provided in this Section 4(a).

               (b) Upon payment of the amounts payable as provided in Section
        4(a), on the Effective Date at the Closing Arch will deliver to the
        Standby Purchaser (or its designees) certificates representing the
        shares of Existing Arch Common Stock, shares of Arch Class B Common
        Stock, if applicable, and, if a Rights Offering Adjustment shall not
        have occurred, the Arch Warrants, in each case, (i) issuable upon
        exercise of any Rights exercised by the Standby Purchaser or (ii)
        otherwise purchased by the Standby Purchaser pursuant to the Commitment.
        At the Closing, Arch will also deliver to the Standby Purchaser (or its
        designees) certificates representing the Arch Warrants or Arch
        Participation Warrants, as the case may be, contemplated by Section 7
        below.

               (c) (i) Arch will deliver to the Standby Purchaser two business
        days after the expiration of the Stockholder Rights Offering a written
        notice which shall (A) specify the amounts payable at the Closing by it
        in satisfaction of the Commitment (without taking into account Section
        4(e) below), (B) specify the Maximum Reduction Number (as defined in
        Section 4(e) below, (C) specify the last date on which the notice
        referred to in Section 4(c) (ii) below may be delivered, and (D)
        indicate the matters required to be addressed in such notice.

                      (ii) Within 10 business days after its receipt of the
        notice referred to in Section 4(c)(i) above, the Standby Purchaser will
        deliver to Arch and MobileMedia a written notice which shall set forth
        the Elected Reduction Number (as defined in Section 4(e) below)
        determined by the Standby Purchaser in accordance with Section 4(e)
        below.

               (d) (i) Arch will deliver to the Standby Purchaser at least five
        business days prior to the Effective Date a written notice which shall
        specify the date on which the Effective Date is to occur and the last
        date on which the notice referred to in Section 4(d)(ii) below may be
        delivered.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7


                      (ii) At least two business days prior to the Effective
        Date, the Standby Purchaser will deliver to Arch and MobileMedia a
        written notice which shall set forth the number of shares of Existing
        Arch Common Stock beneficially owned by it as of such date. During the
        period from the date of such notice through the Effective Date, neither
        the Standby Purchaser nor any affiliate thereof shall acquire beneficial
        ownership of, or any rights to acquire, any additional shares of
        Existing Arch Common Stock or any Unsecured Claim.

               (e) If a Rights Offering Adjustment shall have occurred,
        notwithstanding anything to the contrary herein contained, the Standby
        Purchaser may elect to reduce the number of Rights Shares required to be
        purchased by the Standby Purchaser in satisfaction of its Commitment by
        a number (the "Elected Reduction Number") of Rights Shares equal to or
        less than the product of (i) the number of shares of Existing Arch
        Common Stock to be issued by Arch in the Stockholder Rights Offering and
        (ii) the percentage in Column D of Annex I hereto specified opposite the
        Standby Purchaser's name (such product being referred to herein as the
        "Maximum Reduction Number"). Subject to the immediately preceding
        sentence, the Standby Purchaser shall determine the Elected Reduction
        Number in its sole discretion.

        5. Certain Conditions. The Commitment is subject to the conditions that:

               (a) (i) the Confirmation Order (as defined in the Plan), in a
        form reasonably satisfactory to the Standby Purchaser, shall have been
        entered by the Bankruptcy Court (as defined in the Plan) and (ii) such
        Confirmation Order shall have become a Final Order (as defined in
        Section 5.1(h) of the Merger Agreement); provided, however, that (A) the
        Standby Purchaser may not assert the condition contained in clause (ii)
        above if each of the Other Standby Purchasers that is not affiliated
        with the Standby Purchaser (each, an "Unaffiliated Standby Purchaser"),
        acting in good faith, shall have waived the condition contained in
        Section 5(a) of the Other Standby Purchase Commitments to which such
        Unaffiliated Standby Purchaser is a party and (B) the Standby Purchaser
        may not assert the condition contained in either clause (i) or clause
        (ii) above if the sole reason for the failure of such condition to be
        satisfied is the failure or the threatened failure of the Standby
        Purchaser or any of its affiliates to fulfill the Commitment;

               (b) the satisfaction or, with the written consent of the Standby
        Purchaser, waiver of all conditions precedent to the obligations of each
        of the parties to the Merger Agreement contained in the Merger Agreement
        and all conditions precedent to the effectiveness of the Plan contained
        in the Plan; provided, however, that (i) the conditions contained in
        Section 5.1(e) and (h), Section 5.2(a), (b), (c), (d) and (e) and
        Section 5.3(a), (b), (c) and (e) of the Merger Agreement (collectively,
        the "Unilateral Conditions") may be waived without the written consent
        of the Standby Purchaser and (ii) the Standby Purchaser may not assert
        the condition contained in this clause (b) if the sole reason for
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8


        the failure of such condition to be satisfied is the failure or the
        threatened failure of the Standby Purchaser or any of its affiliates
        to fulfill the Commitment;

               (c) there shall be effective under the Securities Act, a
        registration statement (the "Shelf Registration Statement") covering the
        resale by the Standby Purchaser of (i) all shares of Existing Arch
        Common Stock, all shares of Arch Class B Common Stock, if applicable,
        and, if a Rights Offering Adjustment shall not have occurred, all Arch
        Warrants received by the Standby Purchaser as a result of the
        transactions contemplated by the Plan (including those received upon the
        exercise of Rights and pursuant to this letter agreement), (ii) if a
        Rights Offering Adjustment shall have occurred, all Arch Participation
        Warrants received by the Standby Purchaser pursuant to this letter
        agreement, and (iii) all shares of Existing Arch Common Stock issuable
        upon conversion of any such shares of the Arch Class B Common Stock or
        exercise of any such Arch Warrants or Arch Participation Warrants, as
        the case may be (the securities referred to in the foregoing clauses
        (i), (ii) and (iii) are referred to herein as the "Registrable
        Securities");

               (d) Arch shall have executed and delivered to the Standby
        Purchaser a registration rights agreement in the form attached as
        Exhibit C to the Merger Agreement (the "Registration Rights Agreement")
        granting the Standby Purchaser certain demand and piggyback registration
        rights with respect to the Registrable Securities;

               (e) any and all amendments or modifications to the Merger
        Agreement or any exhibit or schedule thereto (including without
        limitation the Plan, the Arch Charter Amendment, the Arch Warrant
        Agreement, the Arch Participation Warrant Agreement and the Registration
        Rights Agreement) on or after the date hereof and any consents or
        waivers delivered on or after the date hereof by Arch or MobileMedia to
        the other under the Merger Agreement (other than (i) subject to Section
        15(a) below, consents under Section 4.5 of the Merger Agreement, (ii)
        waivers of Unilateral Conditions or (iii) any amendment to the Merger
        Agreement solely to reduce the amount of the Buyer Breakup Fee) shall
        have been in form and substance reasonably satisfactory to the Standby
        Purchaser;

               (f) the representations and warranties of Arch contained in this
        letter agreement shall be true and correct, in all material respects
        (except for the representations and warranties set forth at clauses
        (a)(v) and (a)(vi) of Section 9 below, which shall be true and correct
        in all respects, and except for the representations and warranties set
        forth at clauses (a)(vii) and (a)(viii) of Section 9 below, which shall
        be disregarded for purposes of this clause (f) insofar as they relate to
        financial projections), on the Effective Date, with the same effect as
        though such representations and warranties were made on the Effective
        Date, and Arch shall have performed or complied with, in all material
        respects, its covenants required to be performed or complied with under
        this letter agreement on or prior to the Effective Date (and Arch shall
        have delivered to the Standby Purchaser a
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9


        certificate to the effect that each of the conditions specified in this
        clause (f) is satisfied in all respects);

               (g) the representations and warranties of MobileMedia contained
        in this letter agreement shall be true and correct, in all material
        respects (except for the representations and warranties set forth at
        clauses (b)(v) and (b)(vi) of Section 9 below, which shall be true and
        correct in all respects, and except for the representations and
        warranties set forth at clauses (b)(vii) and (b)(viii) of Section 9
        below, which shall be disregarded for purposes of this clause (f)
        insofar as they relate to financial projections), on the Effective Date,
        with the same effect as though such representations and warranties were
        made on the Effective Date, and MobileMedia shall have performed or
        complied with, in all material respects, its covenants required to be
        performed or complied with, under this letter agreement on or prior to
        the Effective Date (and MobileMedia shall have delivered to the Standby
        Purchaser a certificate to the effect that each of the conditions
        specified in this clause (g) is satisfied in all respects);

               (h) simultaneously with the transactions contemplated by Section
        4 above, Arch shall have performed its obligation under clause (e) of
        Section 1.3 of the Merger Agreement and any debt financing (other than
        secured bank financing) obtained by Arch to enable it to do so shall
        have terms no less favorable to Arch than those set forth in the Bridge
        Commitment Letter (the "Bridge Commitment Letter"); provided, however,
        that the Standby Purchaser may not assert the condition contained in
        this clause (h) if the sole reason for the failure of such condition to
        be satisfied is the failure or threatened failure of the Standby
        Purchaser or any of its affiliates to fulfill the Commitment;

               (i) simultaneously with the transactions contemplated by Section
        4 above, each of the Other Standby Purchasers shall have fulfilled its
        commitment under the Other Standby Purchase Commitment to which it is a
        party, and, if applicable, any other person having a commitment
        contemplated by Section 13(a) hereof shall have fulfilled such
        commitment;

               (j) (i) the shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement shall be so issued and distributed pursuant to an
        exemption from registration under the Securities Act provided by Section
        1145 of the Bankruptcy Code, and (ii)(A) the issuance of the Rights, (B)
        the issuance of the shares of Existing Arch Common Stock, the shares of
        Arch Class B Common Stock, if applicable, and, if a Rights Offering
        Adjustment shall not have occurred, the Arch Warrants upon exercise of
        the Rights, (C) the issuance to the Standby Purchaser of the shares of
        Existing Arch Common Stock, the shares of Arch Class B Common Stock, if
        applicable, and, if a Rights Offering Adjustment shall not have
        occurred, the Arch Warrants as contemplated by Section 1 and Section 3
        above and the Arch Warrants or Arch Participation Warrants, as the case
        may be, as contemplated by
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10


        Section 7 below, and (D) the issuance of Existing Arch Common Stock upon
        exercise of the Arch Warrants or Arch Participation Warrants, as the
        case may be, or conversion of Arch Class B Common Stock, if applicable,
        shall be covered by the Registration Statement, the Registration
        Statement shall have been declared effective and no stop order with
        respect thereto shall be in effect;

               (k) the FCC Grant shall have been issued by the FCC and (ii) such
        FCC Grant shall have become a Final Order (as defined in Section 5.1(e)
        of the Merger Agreement); provided, however, that (A) the Standby
        Purchaser may not assert the condition contained in clause (ii) above if
        each of the Unaffiliated Standby Purchasers, acting in good faith, shall
        have waived the condition contained in Section 5(k) of the Other Standby
        Purchase Commitment to which such Unaffiliated Standby Purchaser is a
        party or (B) the Standby Purchaser may not assert the condition
        contained in either clause (i) or clause (ii) above if the sole reason
        for the failure of such condition to be satisfied is an appeal, a motion
        for reconsideration or similar action taken by any present or former
        officer of any Debtor considered or determined by the FCC to be an
        alleged or actual wrongdoer for purposes of the FCC Proceeding;

               (l) any applicable waiting period under the HSR Act shall have
        expired or been terminated early.


The Standby Purchaser hereby acknowledges and agrees that (i) the entities with
an asterisk next to their names on Annex I hereto (the "Affiliated Standby
Purchasers") shall be deemed to be affiliated with each other for purposes of
clauses (a) and (k) above and clause (iii) of Section 6 below; and (ii) the
Affiliated Standby Purchasers will act jointly with respect to any decision to
waive the condition contained in any such clause and the corresponding clause
contained in the Other Standby Purchase Commitments to which such Affiliated
Standby Purchasers are parties (with the vote of the Affiliated Standby
Purchasers holding at least 85% of the aggregate amount of Unsecured Claims held
by such Affiliated Standby Purchasers to control with respect to the taking of
any such action).

        6. Additional Condition. The Commitment is subject to the further
condition that there shall not have occurred between the Buyer Balance Sheet
Date and the Confirmation Date, and, if the Effective Date does not occur within
90 days following the Confirmation Date, between the Buyer Balance Sheet Date
and the Effective Date (i) any event or events (other than events which affect
generally the economy or the industry in which Arch and MobileMedia conduct
their respective businesses) which has had or would have a material adverse
effect on the business, assets (including licenses, franchise and other
intangible assets), financial condition, operating income or prospects
(determined in each case, where applicable, in accordance with generally
accepted accounting principles and in a manner consistent with the past
practices of Arch and MobileMedia) of Arch, MobileMedia and their respective
subsidiaries, taken as a whole
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11


(collectively, the "Combined Company") (a "Combined Company Material Adverse
Effect"), (ii) any event or events involving a regulatory or statutory change
and affecting generally the industry in which Arch and MobileMedia conduct their
respective businesses which would materially and adversely affect the ability of
the Combined Company to operate its business, or (iii) any event or events
affecting generally the industry in which Arch and MobileMedia conduct their
respective business which would materially and adversely affect the ability of
the Combined Company to operate its business; provided, however, that the
Standby Purchaser may not assert the condition contained in this clause (iii) if
each of the Unaffiliated Standby Purchasers, acting in good faith, shall have
waived the condition in Section 6(iii) of the Other Standby Purchase Commitment
to which such Unaffiliated Standby Purchaser is a party.

        7. Consideration for the Commitment. In consideration for the
Commitment, on the Effective Date at the Closing the Standby Purchaser will
receive its pro rata share of either (a) if a Rights Offering Adjustment shall
not have occurred, Arch Warrants entitling the holders thereof to purchase, in
the aggregate, a number of shares of Existing Arch Common Stock equal to 2.50%
of the issued and outstanding shares of Existing Arch Common Stock and, if
applicable, Arch Class B Common Stock, computed on a Fully Diluted Basis (as
defined in the Plan) on the date the "Initial Buyer Market Price" is determined
in accordance with Schedule II to the Merger Agreement giving effect to the Plan
as if the Effective Date had occurred on such date and assuming 21,067,110
shares of Existing Arch Common Stock are issued and outstanding immediately
prior thereto or (b) if a Rights Offering Adjustment shall have occurred, Arch
Participation Warrants entitling the holders thereof to purchase, in the
aggregate, a number of shares of Existing Arch Common Stock equal to 2.50% of
the issued and outstanding shares of Existing Arch Common Stock and, if
applicable, Arch Class B Common Stock, computed on a Fully Diluted Basis on the
Rights Offering Adjustment Determination Date giving effect to the Plan as if
the Effective Date had occurred on such date and assuming 21,067,110 shares of
Existing Arch Common Stock are issued and outstanding immediately prior thereto.
Such Arch Warrants or Arch Participation Warrants, as the case may be, will be
delivered to the Standby Purchaser and the Other Standby Purchasers, in
accordance with the percentages specified in Column D of Annex I hereto.

        8. Satisfaction of the Commitment. The Standby Purchaser may, in its
sole discretion, satisfy the Commitment directly and/or indirectly through one
or more of its affiliates, separate accounts within its control or investment
funds under its or its affiliates' management.

        9. Representations and Warranties. (a) Arch hereby represents and
warrants to the Standby Purchaser that:

                      (i) Arch is a corporation duly organized, validly existing
               and in good standing under the laws of the State of Delaware and
               has all requisite corporate power and authority to execute,
               deliver and perform its obligations hereunder and to consummate
               the transactions contemplated hereby;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 12


                      (ii) Subject to the approval of the Buyer Charter
               Amendment and the Buyer Share Issuance by the Stockholders of
               Arch, the execution, delivery and performance of this letter
               agreement by Arch and the consummation by Arch of the
               transactions contemplated hereby have been duly and validly
               authorized by all necessary corporate action on the part of Arch;

                      (iii) This letter agreement constitutes the legal, valid
               and binding obligation of Arch, enforceable against Arch in
               accordance with its terms;

                      (iv) Except as described in Section 3.3 of the Buyer
               Disclosure Schedule and except for the applicable requirements of
               the Securities Act, the Exchange Act and any applicable state and
               foreign securities laws, the HSR Act, the Communications Act and
               the regulations of the FCC, state public utility,
               telecommunications or public service laws and the Bankruptcy
               Code, the Confirmation Order and the Amended Plan (collectively,
               the "Applicable Requirements"), the execution, delivery and
               performance of this letter agreement by Arch and the consummation
               by Arch of the transactions contemplated hereby in accordance
               with the terms hereof do not and will not conflict with, violate
               or constitute a breach of any material contract, agreement or
               instrument by which Arch is bound or any judgment, order, decree,
               law, statute, rule, regulation or other judicial or governmental
               restriction to which Arch is subject;

                      (v) Except as described in the Buyer Disclosure Schedule,
               the representations and warranties of Arch contained in the
               Merger Agreement (other than those contained in Sections 3.6,
               3.7, 3.26 and 3.27 thereof), which representations and warranties
               shall be deemed for purposes of this clause (v) not to include
               any qualification or limitation with respect to materiality
               (whether by reference to "Buyer Material Adverse Effect" or
               otherwise), are true and correct, except where the matters in
               respect of which such representations and warranties are not true
               and correct would not have a Buyer Material Adverse Effect;

                      (vi) True, complete and correct copies of the following
               documents are attached hereto as indicated:

                                 Document                     Exhibit Hereto
               ----------------------------------------       --------------
               Merger Agreement (including all exhibits              A
               and schedules thereto)

               Buyer Disclosure Schedule                             B

               Other Standby Purchase Commitments                    C
               
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 13


                                 Document                     Exhibit Hereto
               --------------------------------------------   --------------
               Certificate of Incorporation of Arch, as              D
               amended through the date hereof

               By-laws of Arch, as amended through the               E
               date hereof

               Rights Agreement, dated as of October 13,             F
               1995, between Arch and the Bank of New
               York, as Rights Agent, as amended
               through the date hereof  (the "Rights
               Agreement")

               Draft of the Proxy Statement dated                    G
               August 18, 1998 (the "Draft Proxy
               Statement")

               Existing Registration Rights Agreements               H
               (as defined in Section 9(a)(xi) below),

               Bridge Commitment Letter                              I
              
                      (vii) As of the date hereof, the Draft Proxy Statement
               contains no untrue statement of a material fact or omits to state
               any material fact necessary, in light of the circumstances under
               which it was made, in order to make the statements therein not
               misleading; provided, however, Arch makes no representation with
               respect to either (A) information supplied by MobileMedia for
               inclusion therein or (B) the descriptions of the Merger
               Agreement, the Plan and the other exhibits to the Merger
               Agreement, and of this letter agreement and the Other Standby
               Purchase Commitments, contained therein;

                      (viii) No representation or warranty of Arch contained in
               this letter agreement, and no statement relating to Arch
               contained in the Merger Agreement, the Buyer Disclosure Schedule
               or any other document, certificate or other instrument delivered
               or to be delivered by or on behalf of Arch pursuant to this
               letter agreement (including the definitive Proxy Statement and
               the Registration Statement as declared effective by the SEC),
               contains or will as of the Effective Date contain any untrue
               statement of a material fact or omits or will as of the Effective
               Date omit to state any material fact necessary, in light of the
               circumstances under which it was or will be made, in order to
               make the statements herein or therein not misleading;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 14


                      (ix) Between the Buyer Balance Sheet Date and the date
               hereof, there has not occurred with respect to Arch (A) any event
               or events (other than events which affect generally the economy
               or the industry in which Arch and MobileMedia conduct their
               respective businesses) which has had or would have a Combined
               Company Material Adverse Effect or (B) any event or events
               involving a regulatory or statutory change and affecting
               generally the industry in which Arch and MobileMedia conduct
               their respective business which would materially and adversely
               affect the ability of the Combined Company to operate its
               business;

                      (x) The shares of Existing Arch Common Stock to be issued
               and distributed as contemplated by Section 1.3(e) and Section 1.6
               of the Merger Agreement and the shares of Existing Arch Common
               Stock, the shares of Arch Class B Common Stock, if applicable,
               and either the Arch Warrants to be issued and delivered as
               contemplated by Section 1 and Section 3 above and the Arch
               Warrants to be issued as contemplated by Section 7 above or, if a
               Rights Offering Adjustment shall have occurred, the Arch
               Participation Warrants to be issued as contemplated by Section 7
               above, in each case, when so issued and distributed or delivered,
               as the case may be, and the shares of Existing Arch Common Stock
               issued upon conversation of such shares of Arch Class B Common
               Stock, if applicable, when so converted in accordance with the
               Arch Charter Amendment, and either, if a Rights Offering
               Adjustment shall not have occurred, the shares of Existing Arch
               Common Stock issued upon exercise of such Arch Warrants, when
               issued, paid for and delivered as provided in the Arch Warrant
               Agreement or, if a Rights Offering Adjustment shall have
               occurred, the shares of Existing Arch Common Stock issued upon
               exercise of Arch Participation Warrants, when issued, paid for
               and delivered as provided in the Arch Participation Warrant
               Agreement, will be duly authorized, validly issued, fully paid,
               nonassessable and free of all preemptive rights; and

                      (xi) Schedule 9(a)(xi) hereto sets forth a true, complete
               and correct list of all agreements that are in effect as of the
               date hereof pursuant to which the Company has granted any
               registration rights to any person or entity (the "Existing
               Registration Rights Agreements"), and, except as specified in
               Schedule 9(a) (xi) hereto, none of the Existing Registration
               Rights Agreements is inconsistent with the rights to be granted
               to the Standby Purchaser pursuant to the Registration Rights
               Agreement.

               (b) MobileMedia hereby represents and warrants to the Standby
Purchaser that:

                      (i) MobileMedia is a corporation duly organized, validly
               existing and in good standing under the laws of the State of
               Delaware and, subject to the entry of
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 15


               the Confirmation Order, has all requisite corporate power and
               authority to execute, deliver and perform its obligations
               hereunder and to consummate the transactions contemplated hereby;

                      (ii) Subject to the entry of the Confirmation Order, the
               execution, delivery and performance of this letter agreement by
               MobileMedia and the consummation by MobileMedia of the
               transactions contemplated hereby have been duly and validly
               authorized by all necessary corporate action on the part of
               MobileMedia;

                      (iii) Subject to the entry of the Confirmation Order and
               the effectiveness of the Plan, this letter agreement constitutes
               the legal, valid and binding obligation of MobileMedia,
               enforceable against MobileMedia in accordance with its terms;

                      (iv) Subject to entry of the Confirmation Order, and
               except as described in Section 2.3 of the Company Disclosure
               Schedule and except for the Applicable Requirements, the
               execution, delivery and performance of this letter agreement by
               MobileMedia and the consummation by MobileMedia of the
               transactions contemplated hereby in accordance with the terms
               hereof do not and will not conflict with, violate, or constitute
               a breach of any material contract, agreement or instrument by
               which MobileMedia is bound or any judgment, order, decree, law,
               statute, rule, regulation or other judicial or governmental
               restriction to which MobileMedia is subject;

                      (v) Except as described in the Company Disclosure
               Schedule, the representations and warranties of MobileMedia
               contained in the Merger Agreement (other than those contained in
               Sections 2.6, 2.7, 2.23 and 2.24 thereof), which representations
               and warranties shall be deemed for purposes of this clause (v)
               not to include any qualification or limitation with respect to
               materiality (whether by reference to "Company Material Adverse
               Effect" or otherwise), are true and correct, except where the
               matters in respect of which such representations and warranties
               are not true and correct would not have a Company Material
               Adverse Effect;

                      (vi) True, complete and correct copies of the following
               documents are attached hereto as indicated:

                                 Document                     Exhibit Hereto
               ----------------------------------------       --------------

               Merger Agreement (including all exhibits              A
               and schedules thereto)
               
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 16


                                 Document                     Exhibit Hereto
               -----------------------------------------      --------------
               Other Standby Purchase Commitments                    C

               Company Disclosure Schedule                           J

               Agreement, dated the date hereof (the                 K
               "Debtor/Committee Agreement"), between
               MobileMedia, on behalf of itself and the
               other Debtors, and the Committee (as
               defined in the Plan)

                      (vii) As of the date hereof, the information included in
               the Draft Proxy Statement that was provided for inclusion therein
               by MobileMedia contains no untrue statement of a material fact or
               omits to state any material fact necessary, in light of the
               circumstances under which it was made, in order to make the
               statements therein not misleading;

                      (viii) No representation or warranty of MobileMedia
               contained in this letter agreement, and no statement relating to
               MobileMedia contained in the Merger Agreement, the Company
               Disclosure Schedule or any other document, certificate, or other
               instrument delivered or to be delivered by or on behalf of
               MobileMedia pursuant to this letter agreement, contains or will
               as of the Effective Date contain any untrue statement of a
               material fact or omits or will as of the Effective Date omit to
               state any material fact necessary, in light of the circumstances
               under which it was or will be made, in order to make the
               statements herein or therein not misleading; and

                      (ix) Between the Company Balance Sheet Date and the date
               hereof, there has not occurred with respect to MobileMedia (A)
               any event or events (other than events which affect generally the
               economy or the industry in which Arch and MobileMedia conduct
               their respective businesses) which has had or would have a
               Combined Company Material Adverse Effect or (B) any event or
               events involving a regulatory or statutory change and affecting
               generally the industry in which Arch and MobileMedia conduct
               their respective businesses which would materially and adversely
               affect the ability of the Combined Company to operate its
               business.

               (c) The Standby Purchaser hereby represents and warrants to each
of Arch and MobileMedia that:

                      (i) The Standby Purchaser is a corporation duly organized,
               validly existing under the laws of the State of Wisconsin and has
               all requisite corporate
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 17


               power and authority to execute, deliver and perform its
               obligations hereunder and to consummate the transactions
               contemplated hereby;

                      (ii) The execution, delivery and performance of this
               letter agreement by the Standby Purchaser and the consummation by
               the Standby Purchaser of the transactions contemplated hereby
               have been duly and validly authorized by all necessary corporate
               action on the part of the Standby Purchaser;

                      (iii) This letter agreement constitutes the legal, valid
               and binding obligation of the Standby Purchaser, enforceable
               against the Standby Purchaser in accordance with its terms;

                      (iv) Except for the Applicable Requirements, the
               execution, delivery and performance of this letter agreement by
               the Standby Purchaser and the consummation by the Standby
               Purchaser of the transactions contemplated hereby in accordance
               with the terms hereof do not and will not conflict with, violate
               or constitute a breach of any material contract, agreement, or
               instrument by which the Standby Purchaser is bound or any
               judgment, order, decree, law, statute, rule, regulation or other
               judicial or governmental restriction to which the Standby
               Purchaser is subject, except where such conflicts, violations or
               breaches, individually or in the aggregate, would not have a
               material adverse effect on the ability of the Standby Purchaser
               to consummate the transactions contemplated hereby;

                      (v) No representation or warranty of the Standby Purchaser
               contained in this letter agreement, and no statement contained in
               any other document, certificate or other instrument delivered or
               to be delivered by or on behalf of the Standby Purchaser pursuant
               to this letter agreement, contains or will as of the Effective
               Date contain any untrue statement of a material fact or omits or
               will as of the Effective Date omit to state any material fact
               necessary, in light of the circumstances under which it was or
               will be made, in order to make the statements herein or therein
               not misleading; and

                      (vi) As of the date hereof, the Standby Purchaser holds
               the aggregate stated principal amount of 93/8% Notes and 10 1/2%
               Notes (as such terms are defined in the Plan) indicated under the
               Standby Purchaser's name and address on Annex I hereto.

               (d) None of the representations and warranties made herein or in
any certificate to be delivered as contemplated hereby will survive the Closing.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 18


        10. Certain Covenants. (a) Each of Arch and MobileMedia (i) acknowledges
that the Debtors have agreed to provide to the Committee copies of any and all
notices, documents or information to be provided by or made available by the
Debtors to Arch pursuant to the Merger Agreement or provided by or made
available by Arch to the Debtors pursuant to the Merger Agreement, promptly
after the receipt or provision thereof by or to the Debtors, as applicable, and
that the Committee, pursuant to the undertaking attached as Annex II hereto, has
agreed to distribute copies of the same to the Standby Purchaser and to take
certain other actions and (ii) agrees that the Committee may do so.

               (b) Without limiting the generality of the foregoing clause (a)
of this Section 10, Arch will, before filing the Registration Statement with the
SEC, furnish to the Standby Purchaser and its counsel copies of the Registration
Statement (including all exhibits thereto) proposed to be filed, will provide
the Standby Purchaser and its counsel a reasonable opportunity to review and
comment on such Registration Statement and will not file such Registration
Statement if the Standby Purchaser shall reasonably object thereto within three
calendar days after the receipt thereof.

               (c) Arch will deliver to the Standby Purchaser copies of the
definitive Proxy Statement in the form filed with the SEC and mailed to
Stockholders of Arch and the Registration Statement in the form declared
effective by the SEC.

               (d) Without limiting the generality of the foregoing clause (a)
of this Section 10, Arch will, before filing the Shelf Registration Statement or
any pre-effective amendment thereto, furnish to the Standby Purchaser and its
counsel copies of the Shelf Registration Statement or such pre-effective
amendment thereto, as applicable, proposed to be filed, will provide Standby
Purchaser and its counsel with a reasonable opportunity to review and comment on
the Shelf Registration Statement or such pre-effective amendment thereto, as
applicable, and will not file the Shelf Registration Statement or such
pre-effective amendment thereto, as applicable, to which the Standby Purchaser
or its counsel shall reasonably object within three business days after the
receipt thereof. The Standby Purchaser will furnish to Arch such information
regarding the Standby Purchaser and its plan and method of distribution of the
Registrable Securities as Arch may reasonably request in writing in connection
with the preparation of the Shelf Registration Statement.

               (e) Each of Arch, MobileMedia and the Standby Purchaser will use
its reasonable best efforts to obtain all approvals, waivers, consents and other
authorizations required by the Applicable Requirements, including without
limitation the applicable requirement of the HSR Act, necessary in connection
with the performance of this letter agreement by the Standby Purchaser and the
consummation by the Standby Purchaser of the transactions contemplated hereby.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 19


               (f) Arch will, as requested by the Standby Purchaser, either pay
directly to the appropriate Governmental Entity, on behalf of the Standby
Purchaser, or reimburse the Standby Purchaser for, any fees required to be paid
by the Standby Purchaser in connection with its compliance with the applicable
requirements of the HSR Act. In addition, following the Effective Date, Arch
will reimburse, promptly upon written request (accompanied by appropriate
supporting documentation), costs and expenses (including without limitation
reasonable fees and expenses of legal counsel, including a reasonable allocation
with respect to the cost of any internal counsel) incurred by the Standby
Purchaser in connection with this letter agreement and the transactions
contemplated hereby; provided, however, the reimbursable costs and expenses of
the Affiliated Standby Purchasers shall not exceed $100,000 in the aggregate.

        11. Certain Prohibited Transactions. The Standby Purchaser hereby
covenants that, from and after the date hereof, so long as its commitment
hereunder remains in effect, it will not sell, or enter into any agreement
relating to the sale (including without limitation any short sale, equity swap
or other hedge position) of, any shares of Arch capital stock or, except as
otherwise expressly contemplated by this Section 11, engage in any other
disposition of such shares that might negatively affect the market price of such
shares; provided, however, that the foregoing provision will not apply to any
agreement entered into prior to the date hereof (if not entered into in
contemplation of the transactions contemplated by the Plan, the Merger Agreement
or this letter agreement) or any transaction effected pursuant to the terms
thereof. Notwithstanding the immediately preceding sentence, but subject to
Section 3 above and Section 12 below, the Standby Purchaser may at any time, as
it may determine in its sole and absolute discretion, sell or otherwise
transfer, or acquire, or enter into any agreement relating to the sale, transfer
or acquisition of, Rights or Unsecured Claims. The Standby Purchaser
acknowledges that it has received copies of the Rights Agreement and the
amendment thereto attached as Exhibit D-1 to the Merger Agreement (the "Rights
Plan Amendment"). Arch hereby covenants that it will not, without the prior
written consent of the Standby Purchaser, further amend the Rights Agreement in
any manner that would eliminate or reduce the ownership thresholds applicable to
the Standby Purchaser thereunder; provided, however, that this sentence shall
cease to be of any further force or effect at such time after the Effective Date
as the Standby Purchaser ceases to beneficially own in the aggregate at least
10.0% of the outstanding shares of Existing Arch Common Stock.

        12. Voting Agreement. The Standby Purchaser hereby covenants that (a) so
long as the Bankruptcy Court approves the Disclosure Statement not later than
December 31, 1998 and the Confirmation Order is entered not later than March 31,
1999, (i) it will vote, or cause to be voted, for the acceptance of the Plan all
Unsecured Claims held by it on the date fixed for determining holders of
Unsecured Claims entitled to vote for acceptance or rejection of the Plan (the
"Record Date"), (ii) it will not withdraw or otherwise revoke, or cause to be
withdrawn or otherwise revoked, such vote for the acceptance of the Plan, and
(iii) it will not grant, or cause to be granted, to any other person or entity
any proxy to vote with respect to any such Unsecured Claims (other than a proxy
to vote for the acceptance of the Plan) and (b) except with respect to accounts
which cease to be within the Standby Purchaser's control and investment funds
which
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 20


cease to be under its management, it will not, on or prior to the Record Date,
sell or otherwise transfer any Unsecured Claims held by it unless the transferee
shall have agreed in writing in the form attached as Annex III hereto (i) to
vote for the acceptance of the Plan with respect to such Unsecured Claims and
(ii) not to sell or otherwise transfer such Unsecured Claims unless its
transferee shall agree to be bound in the same manner provided in this clause
(b) with respect to such Unsecured Claims.

        13. Other Standby Purchase Commitments. (a) Each of Arch and MobileMedia
covenants that it will not agree to any amendment or modification to any of the
letter agreements, dated the date hereof, among Arch, MobileMedia and any of the
Other Standby Purchasers (the "Other Standby Purchase Commitments"), without the
prior written consent of the Standby Purchaser. Notwithstanding the immediately
preceding sentence, Arch and MobileMedia may, without the prior written consent
of the Standby Purchaser, agree to an amendment or modification to any of the
Other Standby Purchase Commitments to the extent that (i) such amendment or
modification has the sole effect of reducing or eliminating the financial
commitment thereunder and (ii) simultaneously therewith, a qualified
institutional buyer (as such term is defined in Rule 144A promulgated under the
Securities Act) reasonably acceptable to the Standby Purchaser makes a
commitment in a corresponding amount on terms identical in all material respects
to those set forth in such Other Standby Purchase Commitment.

               (b) The Standby Purchaser will have no liability for the
commitment of any Other Standby Purchaser under any Other Standby Purchase
Commitments or the commitment of any other person contemplated by Section 13(a)
above.

        14. Certain Notices; Certain Information. (a) Each of Arch and
MobileMedia hereby covenants that it will promptly deliver to the Standby
Purchaser, and the Standby Purchaser hereby covenants that it will promptly
deliver to Arch and MobileMedia, written notice of any matter, event or
development that would (i) render any representation or warranty made by it
herein inaccurate or incomplete in any respect or (ii) constitute or result in a
breach by it of, or a failure by it to comply with, any covenant herein
applicable to it.

               (b) Each of Arch and MobileMedia will furnish the Standby
Purchaser with such information regarding itself as the Standby Purchaser may
reasonably request.

        15. Certain Consent Rights. (a) Notwithstanding anything to the contrary
herein contained, except as expressly contemplated by the Merger Agreement or
the Plan, Arch hereby covenants that it will not take, or agree in writing to
take, any action contemplated by Section 4.5(b)(ii), (iii), (iv), (viii) or (ix)
of the Merger Agreement without the prior written consent of the Standby
Purchaser.

               (b) Arch hereby covenants that, without the prior written consent
of the Standby Purchaser, it will not, prior to the Effective Date, enter into
any agreement with respect
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 21


to its securities, or amend any existing agreement with respect to its
securities (including without limitation the Existing Registration Rights
Agreements) in any manner inconsistent with the rights to be granted to the
Standby Purchaser pursuant to the Registration Rights Agreement.

        16. Removal of Legends. In the event that, following the transactions
contemplated by the Merger Agreement, the Plan and this letter agreement, any
certificates evidencing securities ("Certificates") of Arch held by the Standby
Purchaser bear a restrictive legend then:

        (a) if the Standby Purchaser delivers to Arch (i) a certificate, in a
form reasonably satisfactory to Arch, certifying that securities evidenced by
such Certificate have been transferred pursuant to a registration statement that
is effective under the Securities Act or (ii) a certificate, in a form
reasonably satisfactory to Arch, certifying that securities evidenced by such
Certificate have been transferred without registration in accordance with the
requirements of Rule 144 under the Securities Act, Arch will, or will instruct
its transfer agent to, issue upon surrender of such Certificate one or more new
Certificates evidencing the securities so transferred evidenced by the
Certificate so surrendered, which new Certificate or Certificates will not bear
any such legend; and

               (b) if the Standby Purchaser delivers to Arch an opinion of
counsel to the Standby Purchaser (which may be internal counsel to the Standby
Purchaser) that, in the opinion of such counsel, such legend is not, or is no
longer, required to ensure compliance with the Securities Act, Arch will, or
will instruct its transfer agent to, issue upon surrender of such Certificate
one or more new Certificates evidencing the securities evidenced by the
Certificate so surrendered, which new Certificate or Certificates will not bear
any such legend.

                                   *     *     *     *     *

        If you are in agreement with the foregoing, please execute the enclosed
copy of this letter agreement as indicated and return it to the undersigned.
This letter agreement will become effective upon (i) the delivery to us of
executed counterparts of this letter agreement by each of you and (ii) the
execution and delivery of each of the Other Standby Purchase Commitments by each
of the parties thereto. Once effective, this letter agreement will terminate on
(i) the date on which the Debtor Tower Agreement is terminated, unless prior to
or simultaneously with such termination, MobileMedia shall have entered into a
definitive agreement (which shall be comparable in form and substance to the
Debtor Tower Agreement and a copy of which shall be delivered to the Standby
Purchaser promptly following the execution thereof) with a bona fide third-party
purchaser providing for a sale to such third party of the assets or
substantially all of the assets to be sold to Pinnacle pursuant to the Debtor
Tower Agreement resulting in net proceeds to MobileMedia of not less than $165.0
million (an "Acceptable Sale"), (ii) December 31, 1998, unless the Closing (as
defined in the Debtor Tower Agreement) or the closing of an Acceptable Sale
shall have occurred on or before such date, (iii) March 31, 1999, unless the
Confirmation
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 22


Order shall have been entered by the Bankruptcy Court on or before such date,
(iv) June 30, 1999, unless the effectiveness of the Plan occurs on or before
such date, or (v) if not theretofore terminated pursuant to one of the foregoing
clauses, the date on which the Merger Agreement is terminated in accordance with
the terms thereof.

        All notices and other communications hereunder must be in writing. Any
notice or other communication hereunder will be deemed duly delivered three
business days after it is sent by registered or certified mail, return receipt
requested, postage prepaid, or two business days after it is sent via a
reputable international overnight courier service, in each case to the intended
recipient at the address therefor set forth on the signature page hereto. Any
party hereto may give any notice or other communication hereunder by personal
delivery or telecopy, but no such notice or other communication will be deemed
to have been duly given unless and until it actually is received by the party
for whom it is intended. Any party may change the address to which notices and
other communications hereunder are to be delivered by giving the other parties
notice in the manner herein set forth.

        This letter agreement represents the final agreement among the parties
hereto with respect to the subject matter hereof and may not be contradicted by
evidence of prior or contemporaneous agreements of the parties. There are no
unwritten oral agreements between the parties relating to the subject matter
hereof. This letter agreement may not be amended or modified except by a written
instrument signed by each of the Standby Purchaser, Arch and MobileMedia.

        This letter agreement shall be governed by and construed in accordance
with the laws of the State of Delaware without regard to its principles of
conflicts of law.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 23


        This letter agreement may be executed in counterparts which, taken
together, shall constitute one and the same instrument.

                                     Very truly yours,

                                     Northwestern Mutual Life
                                       Insurance Company
                                     for its Group Annuity Separate Account

                                     By:    Northwestern Investment Mangement
                                            Company


                                     By:
                                        ---------------------------------------
                                     Name:  Steven P. Swanson
                                     Its:   Managing Director

                                     Address:  720 E. Wisconsin Avenue
                                               Milwaukee, Wisconsin 53202
                                               Attention:  Securities Department

ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.


By:
   --------------------------------
Name:
     ------------------------------
Its:
    -------------------------------

Address:  1800 West Park Drive, Suite 250
          Westborough, MA  01581
          Attn:  Chairman and Chief
                  Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA  02109
               Attn:  Jay E. Bothwick
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 24


Subject to entry of the Confirmation Order:

MobileMedia Communication, Inc.


By:
   -------------------------------
Name:
     -----------------------------
Its:
    ------------------------------

Address:  Fort Lee Executive Park
          One Executive Drive, Suite 500
          Fort Lee, NJ  07024
          Attn:  Chairman - Restructuring

With copy to:  Sidley & Austin
               875 Third Avenue, Suite 1400
               New York, New York  10022
               Attn:  James D. Johnson
<PAGE>

                                                                         ANNEX I
                                                                         -------

                               COMMITMENT AMOUNTS
                              (dollars in millions)

<TABLE>
<CAPTION>
                                                     Column A           Column B           Column C       Column D
                                                     --------           --------           --------       --------
                                                
                                                 Rights Exercise   Unexercised Rights       Total
                                                    Commitment         Commitment        Commitment      Commitment
Name and Address of Standby Purchasers              Amount (1)         Amount (2)           Amount       Percentage
- --------------------------------------             ------------       ------------         --------     -----------
<S>                                                    <C>               <C>                <C>            <C>   
W.R. Huff Asset Management Co., L.L.C., as             $39.27            $35.80             $75.07         34.60%
   agent for its affiliates and discretionary                                            
   accounts                                                                              
67 Park Place, 9th Floor                                                                 
Morristown, New Jersey  07960                                                            
Stated Principal Amount of 9 3/8% Notes:                                                 
$  57,847,000                                                                          
Stated Principal Amount of 10 1/2% Notes:                                                
$  27,970,000                                                                          
                                                                                         
The Northwestern Mutual Life Insurance                 $10.95             $9.97             $20.92          9.64%
   Company*                                                                              
720 East Wisconsin Avenue                                                                
Milwaukee, Wisconsin  53202                                                              
Stated Principal Amount of 9 3/8% Notes:                                                 
$  19,776,000                                                                            
Stated Principal Amount of 10 1/2% Notes:                                                
$  3,350,000                                                                           
                                                                                         
The Northwestern Mutual Life Insurance                  $2.65             $2.42              $5.07          2.34%
   Company for its Group Annuity Separate                                                
   Account*                                                                              
720 East Wisconsin Avenue                                                                
Milwaukee, Wisconsin  53202                                                              
Stated Principal Amount of 9 3/8% Notes:                                                 
$     -0-                                                                            
Stated Principal Amount of 10 1/2% Notes                                                 
$   7,000,000                                                                        
</TABLE>                                        
                                            
- --------
* The Northwestern Mutual Life Insurance Company, The Northwestern Mutual Life
Insurance Company for its Group Annuity Separate Account and Northwestern Mutual
Series Fund, Inc. for the High Yield Bond Portfolio are affiliated entities for
purposes of clauses (a) and (k) of Section 5 and clause (iii) of Section 6.
<PAGE>

                               COMMITMENT AMOUNTS
                              (dollars in millions)

<TABLE>
<CAPTION>
                                                      Column A           Column B           Column C       Column D
                                                      --------           --------           --------       --------

                                                  Rights Exercise   Unexercised Rights       Total
                                                    Commitment         Commitment          Commitment     Commitment
Name and Address of Standby Purchasers               Amount (1)         Amount (2)           Amount       Percentage
- --------------------------------------              ------------       ------------         --------     -----------
<S>                                                        <C>               <C>              <C>            <C>  
Northwestern Mutual Series Fund, Inc. for the              $.75              $.69             $1.44          0.66%
   High Yield Bond Portfolio*                                                              
720 East Wisconsin Avenue                                                                  
Milwaukee, Wisconsin  53202                                                                
Stated Principal Amount of 9 3/8% Notes:                                                   
$       -0-                                                                                
Stated Principal Amount of 10 1/2% Notes:                                                  
$    2,000,000                                                                             
                                                                                           
Credit Suisse First Boston Corporation                   $29.48            $26.88            $56.36         25.97%
11 Madison Avenue, 4th Floor                                                               
New York, New York 10010                                                                   
Stated Principal Amount of 9 3/8% Notes:                                                   
$   32,453,000                                                                             
Stated Principal Amount of 10 1/2% Notes:                                                  
$   35,930,000                                                                             
                                                                                           
Whippoorwill Associates, Inc., as general partner        $30.42            $27.72            $58.14         26.79%
   and/or agent for the parties set forth on                                               
   Schedule A hereto in the percentages noted                                              
   thereon                                                                                 
11 Martine Avenue                                                                          
White Plains, New York 10606                                                               
Stated Principal Amount of 9 3/8% Notes:                                                   
$   37,855,000                                                                             
Stated Principal Amount of 10 1/2% Notes:                                                  
$   31,410,000                                                                             
                                       Total:           $113.52           $103.48           $217.00        100.00%
                                                        -------           -------           -------
</TABLE>                                                       
                                                   
(1)   The "Rights Exercise Commitment Amount", for each Standby Purchaser, shall
      mean an amount equal to the product of (i) the Rights Subscription Price
      (as defined in Schedule II to the Merger Agreement) and (ii) the number of
      Rights issuable in respect of an amount of Allowed Unsecured Claims
      derived from the principal amount of 9 3/8% Notes and the 10 1/2% Notes
      indicated under the Standby Purchaser's name on this Annex I held by such
      Standby Purchaser on the date hereof. The dollar amounts set forth under
      Column A are estimates provided for illustrative purposes only, based on
      the assumptions that (x) there is a total of $475 million of Allowed
      Unsecured Claims, (y) there is no Rights Reserve (as defined in the Plan)
      and (z) the aggregate amount of Subordinated Noteholder Claims (as defined
      in the Plan) is $441,819,762.

(2)   The "Unexercised Rights Commitment Amount", for each Standby Purchaser,
      shall mean an amount equal to (i) the Total Commitment Amount indicated in
      Column C for such Standby Purchaser less (ii) the Rights Exercise
      Commitment Amount for such Standby Purchaser. The dollar amounts set forth
      under Column B are estimates provided for illustrative purposes only,
      based on the estimates set forth in Column A.
<PAGE>

                                                                        ANNEX II
                                                                        --------

                                   UNDERTAKING
                                   -----------

               The Committee hereby undertakes to distribute to the Standby
Purchaser (until instructed by the Standby Purchaser to do otherwise) copies of
any and all notices, documents or information to be provided by or made
available by the Debtors to Arch pursuant to the Merger Agreement or provided by
or made available by Arch to the Debtors pursuant to the Merger Agreement that
are received by the Committee pursuant to the Debtor/Committee Agreement as soon
as practicable with its receipt thereof. The Committee hereby further undertakes
to consult with the Standby Purchaser (until instructed by the Standby Purchaser
to do otherwise) prior to delivering any written consent or exercising any other
right of the Committee (other than the distribution of notices, documents or
information to the Standby Purchaser or the Other Standby Purchasers) pursuant
to the Debtor/Committee Agreement or the Plan. The Committee will not enter into
any amendment to the Debtor/Committee Agreement without the prior written
consent of the Standby Purchaser.

                                            THE OFFICIAL COMMITTEE
                                            OF UNSECURED CREDITORS


                                            By:
                                               --------------------------------
                                            Its:
                                                -------------------------------
     
<PAGE>

                                                                       ANNEX III
                                                                       ---------

                                VOTING AGREEMENT
                                ----------------

        The undersigned transferee of indebtedness of MobileMedia Corporation or
one of its direct or indirect subsidiaries (collectively, "MobileMedia")
described in Schedule A attached hereto (the "Claim"), hereby acknowledges and
agrees as follows:

        1.     MobileMedia is a debtor-in-possession under Chapter 11 of the
               Bankruptcy Code and has proposed a First Amended Joint Plan of
               Reorganization dated August __, 1998 (the "Amended Plan").

        2.     By acquiring the Claim the undersigned may also acquire rights to
               vote on the adoption of the Amended Plan.

        3.     As a condition of the transfer of the Claim, the undersigned
               hereby agrees to exercise all voting rights it may have as holder
               of the Claim in favor of the Amended Plan unless the Amended Plan
               shall have been withdrawn.

        4.     The undersigned agrees that it shall not subsequently transfer
               the Claim or any portion thereof unless and until it obtains from
               its transferee a Voting Agreement identical to the form hereof.

        IN WITNESS HEREOF, the undersigned transferee has executed this Voting
Agreement this _____ day of __________, 199_.


                                         [TRANSFEREE]



                                         By:
                                            --------------------------
                                            Title:


Accepted By:


- -------------------------
[Transferor]
<PAGE>

                                   SCHEDULE A


[Describe Claim.]
<PAGE>

                                                              SCHEDULE 9(a) (xi)
                                                              ------------------

Existing Registration Rights Agreement

(1)   Registration Rights Agreement, dated as of June 24, 1998, by and among
      Arch Communications Group, Inc., Sandler Capital Partner, 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, as amended

(2)   Registration Rights Agreement, dated as of June 29, 1998, Arch
      Communications Group, Inc. Adelphia Communications Corporation and
      Lisa-Gaye Shearing

Inconsistencies:

The provisions of the Registration Rights Agreement listed at (2) above are
inconsistent in certain respects with the provisions of the Registration Rights
Agreement.
<PAGE>
                                                                       EXHIBIT I

                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
                            720 East Wisconsin Avenue
                           Milwaukee, Wisconsin 53202


                                 August 18, 1998

Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts  01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey  07024

               Re:    Commitment to Purchase Stock and Warrants
                      -----------------------------------------

Gentlemen:

        Arch Communications Group, Inc., a Delaware corporation ("Arch"), and
MobileMedia Communications, Inc., a Delaware corporation ("MobileMedia"), intend
to engage in a business combination transaction (the "Combination") as part of a
reorganization (the "Reorganization") of MobileMedia, MobileMedia Corporation,
the sole stockholder of MobileMedia ("Parent"), and all of MobileMedia's
subsidiaries (collectively, the "Debtors") pursuant to chapter 11 of title 11,
United States Code, 11 U.S.C. ss.ss. 101 et seq. (the "Bankruptcy Code"). It is
our understanding that in connection with the Reorganization, among other
things: (a) pursuant to the Agreement and Plan of Merger, dated as of the date
hereof (the "Merger Agreement"), among Arch, a wholly owned subsidiary of Arch
("Merger Sub"), Parent and MobileMedia, MobileMedia will merge with and into
Merger Sub, with Merger Sub continuing as the surviving corporation and a wholly
owned subsidiary of Arch; (b) pursuant to the Merger Agreement, Arch will make
available for distribution pursuant to a plan of reorganization of the Debtors
in the form attached as Exhibit A to the Merger Agreement, with such amendments
and modifications thereto as are made in a manner consistent with clause (e) of
Section 5 hereto (such plan of reorganization being referred to herein as the
"Plan"), (i) cash, (ii) shares of its Common Stock, par value $.01 per share
("Existing Arch Common Stock"), and (iii) warrants entitling the holders thereof
to purchase shares of Existing Arch Common Stock ("Arch Warrants"), with such
Arch Warrants to be issued pursuant to, and to have the terms set forth in, a
warrant agreement in the form attached as Exhibit B to the Merger Agreement (the
"Arch Warrant Agreement"); (c) holders of unsecured non-priority claims against
the Debtors ("Unsecured Claims"), to the extent such Unsecured Claims are
Allowed (as defined in the Plan), will receive pursuant to the Plan (i) shares
of Existing Arch Common Stock and (ii) rights to purchase ("Rights") for cash
units consisting of (A) shares of Existing Arch Common Stock and (B) Arch
Warrants; (d) holders of claims arising under or relating to the Credit
Agreement, dated December 4, 1995, as amended, among MobileMedia and 
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2


the other parties thereto ("Secured Claims"), to the extent such Secured Claims
are Allowed, will receive pursuant to the Plan cash in an amount equal to 100%
of such claims; (e) all of the outstanding equity interests in MobileMedia and
Parent will be canceled without consideration and Parent will be dissolved; and
(f) the commitments under the DIP Loan Agreement will terminate and all amounts
owed under or in respect of the DIP Loan Agreement will be paid in full in cash.

        Terms used herein with initial capital letters that are not otherwise
defined shall have the meanings ascribed to such terms in the Merger Agreement.

        1. The Commitment. In connection with the foregoing, The Northwestern
Mutual Life Insurance Company (the "Standby Purchaser") hereby advises you of
its commitment (the "Commitment"), subject to the conditions set forth herein:

               (a) to exercise any Rights distributed to it in respect of its
        Allowed Unsecured Claims in accordance with the Plan and not thereafter
        sold or transferred as permitted by Section 3 below to purchase units
        consisting of shares of Existing Arch Common Stock and Arch Warrants
        underlying such Rights, to the extent that the aggregate purchase price
        payable upon such exercise, as determined in accordance with Schedule II
        to the Merger Agreement (the "Subscription Price"), does not exceed the
        Rights Exercise Commitment Amount of the Standby Purchaser as set forth
        in Annex I hereto;

               (b) if (i) the Standby Purchaser sells or otherwise transfers any
        or all of (A) the Rights distributed to it in accordance with the Plan
        or (B) Unsecured Claims held by it as of the date hereof in respect of
        which Rights are to be distributed, in each case as permitted by Section
        3 below, and (ii) the Rights sold or transferred by the Standby
        Purchaser or the Rights distributed in respect of Unsecured Claims held
        by it as of the date hereof that are hereafter sold or transferred by
        the Standby Purchaser are not exercised prior to the expiration thereof
        (at which time such Rights will be void and will no longer be
        exercisable), to purchase for cash (based upon the Subscription Price
        payable upon exercise of such Rights) identical units consisting of
        shares of Existing Arch Common Stock and Arch Warrants underlying such
        unexercised Rights, to the extent that the aggregate purchase price
        therefor, together with the aggregate Subscription Price payable upon
        exercise of Rights exercised as contemplated by clause (a) above, does
        not exceed the Rights Exercise Commitment Amount of the Standby
        Purchaser as set forth in Annex I hereto; and

               (c) if any Rights distributed in accordance with the Plan (other
        than (i) Rights distributed to the Standby Purchaser or the other
        holders of Unsecured Claims listed on Annex I hereto (the "Other Standby
        Purchasers") and retained by them (which Rights are referred to in
        Section 1(a) above and Section 1(a) of each of the Other Standby
        Purchase Commitments (as defined in Section 13(a) below)) or (ii)
        subject to Section 3(b) below,
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3


        Rights distributed in respect of Unsecured Claims held by the Standby
        Purchaser or the Other Standby Purchasers as of the date hereof that are
        hereafter sold or transferred by them (which Rights are referred to in
        Sections 1(b) and 3 hereof and Sections 1(b) and 3 of each of the Other
        Standby Purchase Commitments)) remain unexercised upon the expiration
        thereof (at which time such Rights will be void and will no longer be
        exercisable), to purchase for cash (based on the Subscription Price
        payable upon exercise of such Rights) pro rata in accordance with and up
        to the Unexercised Rights Commitment Amount of the Standby Purchaser as
        set forth in Annex I hereto identical units consisting of shares of
        Existing Arch Common Stock and Arch Warrants underlying such unexercised
        Rights.

        2. Arch Class B Common Stock. (a) Notwithstanding anything to the
contrary herein contained, if the purchases by the Standby Purchaser
contemplated by Section 1 above would cause the Standby Purchaser, the Other
Standby Purchasers, and any other persons or entities who, when taken together
with any one or more of the Standby Purchaser and the Other Standby Purchasers,
would constitute a "person" or "group" as used in Section 13(d) or Section 14(d)
of the Exchange Act or Rule 13d-3 or Rule 13d-5 promulgated thereunder, or any
"affiliate" as defined in Rule 405 promulgated under the Securities Act of any
of them (collectively, the "Standby Class B Holders"), in the aggregate, to
beneficially own on the effective date of the Plan (the "Effective Date") shares
representing more than 49.0% of the capital stock of Arch generally entitled to
vote in the election of directors or more than 49.0% of the total voting power
of the capital stock of Arch, Arch will substitute shares of Class B Common
Stock, par value $.01 per share, of Arch ("Arch Class B Common Stock"), with
such Arch Class B Common Stock having the terms set forth in the form of
Certificate of Amendment to Certificate of Incorporation of Arch attached as
Exhibit F to the Merger Agreement (the "Arch Charter Amendment"), for shares of
Existing Arch Common Stock included in the units so purchased on a one-for-one
basis such that on the Effective Date the Standby Class B Holders, in the
aggregate, will beneficially own shares representing not more than 49.0% of the
capital stock of Arch generally entitled to vote in the election of directors
and not more than 49.0% of the total voting power of the capital stock of Arch,
all as provided in the Plan. For purposes of this letter agreement, "beneficial
ownership" shall be determined as provided in Rule 13d-3 and Rule 13d-5
promulgated under the Exchange Act, except that a person or entity shall be
deemed to have "beneficial ownership" of all securities that such person or
entity has the right to acquire, whether such right is exercisable immediately
or only after the passage of time.

               (b) For purposes of calculating the percentages referred to in
Section 2(a) above, it will be assumed that no additional Unsecured Claims are
allowed after the Effective Date and all of the shares of Existing Arch Common
Stock in the Creditor Stock Pool (as defined in the Plan) are distributed in
accordance with the Plan to the holders of Allowed Unsecured Claims as of the
Effective Date.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4


               (c) Substitution of shares of Class B Common Stock as
contemplated by Section 2(a) above will be effectuated as follows:

                      (i) first, to the extent that the Standby Purchaser or any
               Other Standby Purchaser beneficially owns shares of Existing Arch
               Common Stock as of the Effective Date, other than those acquired
               as contemplated by the Plan, the Merger Agreement, this letter
               agreement and the Other Standby Purchase Commitments ("Non-Plan
               Arch Shares"), among the Standby Purchaser and such Other Standby
               Purchaser pro rata based on ownership of Non-Plan Arch Shares up
               to an amount equal to the aggregate number of Non-Plan Arch
               Shares beneficially owned by them as of the Effective Date; and

                      (ii) second, if necessary, among the Standby Purchaser and
               the Other Standby Purchasers in accordance with the percentages
               set forth in Column D of Annex I hereto.

               (d) The Standby Purchaser hereby disclaims beneficial ownership
of any securities of Arch owned by the Other Standby Purchasers.

        3. Certain Transfer Restrictions. (a) Subject to Section 12 below, the
Standby Purchaser may (i) sell or otherwise transfer any or all of (A) the
Rights distributed to it in accordance with the Plan or (B) Unsecured Claims in
respect of which Rights are to be distributed or (ii) purchase or otherwise
acquire (A) Rights distributed to others in accordance with the Plan or (B)
Unsecured Claims in respect of which Rights are to be distributed; provided,
however, that, with respect to clause (i) of this sentence, (X)
contemporaneously with the consummation of any such sale or other transfer of
Rights or Unsecured Claims, the Standby Purchaser will notify Arch and
MobileMedia of the occurrence thereof and (Y) the Standby Purchaser will not
consummate any such sale or other transfer unless the transferee or transferees
of such Rights or Unsecured Claims shall have entered into a written agreement
(a "Tracking Agreement") (I) to notify the Standby Purchaser, Arch and
MobileMedia of any subsequent transfer by it of such Rights or Unsecured Claims
or any Rights distributed to it in respect of such Unsecured Claims and (II) not
to sell or otherwise transfer such Rights or Unsecured Claims or Rights
distributed to it in respect of such Unsecured Claims, unless its transferee or
transferees shall agree in writing to be bound in the same manner provided in
this clause (Y) with respect to any subsequent transfer by it.

        (b) Notwithstanding the provisions of clause (Y) of the proviso in
Section 3(a) above, the Standby Purchaser may elect to sell or otherwise
transfer (i) any or all of the Rights distributed to it in accordance with the
Plan or (ii) Unsecured Claims in respect of which Rights are to be so
distributed, in either case without entering into a Tracking Agreement with its
transferee or transferees (any Rights so transferred and any Rights distributed
in respect of Allowed Claims so transferred, together with any Rights so
transferred and any Rights distributed
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5


in respect of Allowed Claims so transferred by the Other Standby Purchasers
pursuant to Section 3(b) of the Other Standby Purchase Commitments, being
referred to herein collectively as "Untracked Rights"). Any Rights that remain
unexercised upon expiration thereof will be deemed to be "Section 3(b) Rights"
up to, but not exceeding, the amount of Untracked Rights. The Section 3(b)
Rights shall be exercised as follows prior to the application of Section 1(c)
above and Section 1(c) of the Other Standby Purchase Commitments: (A) the
Standby Purchaser and the Other Standby Purchasers will first be given the
opportunity to purchase for cash (based on the Subscription Price payable upon
exercise of such Rights) units consisting of shares of Arch Common Stock and
Arch Warrants underlying a number of unexercised Rights up to the amount of
Section 3(b) Rights in accordance with the percentages set forth in Column D of
Annex I hereto and (B) to the extent such units are not so purchased, the
Standby Purchaser and any Other Standby Purchasers that are responsible for the
existence of the Section 3(b) Rights will be required to purchase such units pro
rata based on the number of Section 3(b) Rights resulting from their respective
transfers. Nothing in this Section 3(b) will in any way reduce the commitment of
the Standby Purchaser specified in Section 1(c) above or the Unexercised Rights
Commitment Amount as set forth in Annex I hereto.

        4. The Closing. (a) Notwithstanding anything to the contrary herein
contained or the terms of the Rights or the Plan, subject to the conditions set
forth herein, on the Effective Date the Standby Purchaser, in satisfaction of
the Commitment, will deliver at the Closing (i) the aggregate Subscription Price
payable upon exercise of any Rights exercised by it and (ii) the purchase price
payable in consideration of any shares of Existing Arch Common Stock or, if
applicable, Arch Class B Common Stock and Arch Warrants to be otherwise
purchased by it pursuant to the Commitment; provided, however, that, if
requested by the Standby Purchaser in writing at least two business days prior
to the Effective Date, any cash to be distributed to the Standby Purchaser in
respect of Allowed Secured Claims pursuant to the Plan will, prior to the
distribution thereof pursuant to the Plan and in accordance with the instruction
included in such written request, be first applied, on behalf of the Standby
Purchaser, to the payment of such amounts payable on the Effective Date as
provided in this Section 4(a).

               (b) Upon payment of the amounts payable as provided in Section
4(a), on the Effective Date at the Closing Arch will deliver to the Standby
Purchaser (or its designees) certificates representing the shares of Existing
Arch Common Stock, shares of Arch Class B Common Stock, if applicable, and the
Arch Warrants, in each case, (i) issuable upon exercise of any Rights exercised
by the Standby Purchaser or (ii) otherwise purchased by the Standby Purchaser
pursuant to the Commitment.

               (c) Arch will deliver to the Standby Purchaser at least five
business days prior to the Effective Date a written notice which shall (i)
specify the amounts payable at the Closing by it in satisfaction of the
Commitment, (ii) specify the date on which the Effective Date is to occur and
the last date on which the notice referred to in Section 4(d) may to be
delivered, and (iii) indicate the matters required to be addressed in such
notice.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6


               (d) At least two business days prior to the Effective Date, the
Standby Purchaser will deliver to Arch and MobileMedia a written notice which
shall set forth the number of shares of Existing Arch Common Stock beneficially
owned by it as of such date. During the period from the date of such notice
through the Effective Date, neither the Standby Purchaser nor any affiliate
thereof shall acquire beneficial ownership of, or any rights to acquire, any
additional shares of Existing Arch Common Stock or any Unsecured Claim.

        5. Certain Conditions. The Commitment is subject to the conditions that:

               (a) (i) the Confirmation Order (as defined in the Plan), in a
        form reasonably satisfactory to the Standby Purchaser, shall have been
        entered by the Bankruptcy Court (as defined in the Plan) and (ii) such
        Confirmation Order shall have become a Final Order (as defined in
        Section 5.1(h) of the Merger Agreement); provided, however, that (A) the
        Standby Purchaser may not assert the condition contained in clause (ii)
        above if each of the Other Standby Purchasers that is not affiliated
        with the Standby Purchaser (each, an "Unaffiliated Standby Purchaser"),
        acting in good faith, shall have waived the condition contained in
        Section 5(a) of the Other Standby Purchase Commitments to which such
        Unaffiliated Standby Purchaser is a party and (B) the Standby Purchaser
        may not assert the condition contained in either clause (i) or clause
        (ii) above if the sole reason for the failure of such condition to be
        satisfied is the failure or the threatened failure of the Standby
        Purchaser or any of its affiliates to fulfill the Commitment;

               (b) the satisfaction or, with the written consent of the Standby
        Purchaser, waiver of all conditions precedent to the obligations of each
        of the parties to the Merger Agreement contained in the Merger Agreement
        and all conditions precedent to the effectiveness of the Plan contained
        in the Plan; provided, however, that (i) the conditions contained in
        Section 5.1(e) and (h), Section 5.2(a), (b), (c), (d) and (e) and
        Section 5.3(a), (b), (c) and (e) of the Merger Agreement (collectively,
        the "Unilateral Conditions") may be waived without the written consent
        of the Standby Purchaser and (ii) the Standby Purchaser may not assert
        the condition contained in this clause (b) if the sole reason for the
        failure of such condition to be satisfied is the failure or the
        threatened failure of the Standby Purchaser or any of its affiliates to
        fulfill the Commitment;

               (c) there shall be effective under the Securities Act, a
        registration statement (the "Shelf Registration Statement") covering the
        resale by the Standby Purchaser of (i) all shares of Existing Arch
        Common Stock, all shares of Arch Class B Common Stock, if applicable,
        and all Arch Warrants received by the Standby Purchaser as a result of
        the transactions contemplated by the Plan (including those received upon
        the exercise of Rights and pursuant to this letter agreement) and (ii)
        all shares of Existing Arch Common Stock issuable upon conversion of any
        such shares of the Arch Class B Common Stock or exercise of any such
        Arch Warrants (the securities referred to in the foregoing clauses (i)
        and (ii) are referred to herein as the "Registrable Securities");
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7


               (d) Arch shall have executed and delivered to the Standby
        Purchaser a registration rights agreement in the form attached as
        Exhibit C to the Merger Agreement (the "Registration Rights Agreement")
        granting the Standby Purchaser certain demand and piggyback registration
        rights with respect to the Registrable Securities;

               (e) any and all amendments or modifications to the Merger
        Agreement or any exhibit or schedule thereto (including without
        limitation the Plan, the Arch Charter Amendment, the Arch Warrant
        Agreement and the Registration Rights Agreement) on or after the date
        hereof and any consents or waivers delivered on or after the date hereof
        by Arch or MobileMedia to the other under the Merger Agreement (other
        than (i) subject to Section 15(a) below, consents under Section 4.5 of
        the Merger Agreement or (ii) waivers of Unilateral Conditions) shall
        have been in form and substance reasonably satisfactory to the Standby
        Purchaser;

               (f) the representations and warranties of Arch contained in this
        letter agreement shall be true and correct, in all material respects
        (except for the representations and warranties set forth at clauses
        (a)(v) and (a)(vi) of Section 9 below, which shall be true and correct
        in all respects, and except for the representations and warranties set
        forth at clauses (a)(vii) and (a)(viii) of Section 9 below, which shall
        be disregarded for purposes of this clause (f) insofar as they relate to
        financial projections), on the Effective Date, with the same effect as
        though such representations and warranties were made on the Effective
        Date, and Arch shall have performed or complied with, in all material
        respects, its covenants required to be performed or complied with under
        this letter agreement on or prior to the Effective Date (and Arch shall
        have delivered to the Standby Purchaser a certificate to the effect that
        each of the conditions specified in this clause (f) is satisfied in all
        respects);

               (g) the representations and warranties of MobileMedia contained
        in this letter agreement shall be true and correct, in all material
        respects (except for the representations and warranties set forth at
        clauses (b)(v) and (b)(vi) of Section 9 below, which shall be true and
        correct in all respects, and except for the representations and
        warranties set forth at clauses (b)(vii) and (b)(viii) of Section 9
        below, which shall be disregarded for purposes of this clause (f)
        insofar as they relate to financial projections), on the Effective Date,
        with the same effect as though such representations and warranties were
        made on the Effective Date, and MobileMedia shall have performed or
        complied with, in all material respects, its covenants required to be
        performed or complied with, under this letter agreement on or prior to
        the Effective Date (and MobileMedia shall have delivered to the Standby
        Purchaser a certificate to the effect that each of the conditions
        specified in this clause (g) is satisfied in all respects);

               (h) simultaneously with the transactions contemplated by Section
        4 above, Arch shall have performed its obligation under clause (e) of
        Section 1.3 of the Merger
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8


        Agreement and any debt financing (other than secured bank financing)
        obtained by Arch to enable it to do so shall have terms no less
        favorable to Arch than those set forth in the Bridge Commitment Letter;
        provided, however, that the Standby Purchaser may not assert the
        condition contained in this clause (h) if the sole reason for the
        failure of such condition to be satisfied is the failure or threatened
        failure of the Standby Purchaser or any of its affiliates to fulfill the
        Commitment;

               (i) simultaneously with the transactions contemplated by Section
        4 above, each of the Other Standby Purchasers shall have fulfilled its
        commitment under the Other Standby Purchase Commitment to which it is a
        party, and, if applicable, any other person having a commitment
        contemplated by Section 13(a) hereof shall have fulfilled such
        commitment;

               (j) (i) the shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement shall be so issued and distributed pursuant to an
        exemption from registration under the Securities Act provided by Section
        1145 of the Bankruptcy Code, and (ii)(A) the issuance of the Rights, (B)
        the issuance of the shares of Existing Arch Common Stock, the shares of
        Arch Class B Common Stock, if applicable, and the Arch Warrants upon
        exercise of the Rights, (C) the issuance to the Standby Purchaser of the
        shares of Existing Arch Common Stock, the shares of Arch Class B Common
        Stock, if applicable, and the Arch Warrants as contemplated by Section 1
        and Section 3 above and the Arch Warrants as contemplated by Section 7
        below, and (D) the issuance of Existing Arch Common Stock upon exercise
        of the Arch Warrants or conversion of Arch Class B Common Stock, if
        applicable, shall be covered by the Registration Statement, the
        Registration Statement shall have been declared effective and no stop
        order with respect thereto shall be in effect;

               (k) (i) the FCC Grant shall have been issued by the FCC and (ii)
        such FCC Grant shall have become a Final Order (as defined in Section
        5.1(e) of the Merger Agreement); provided, however, that (A) the Standby
        Purchaser may not assert the condition contained in clause (ii) above if
        each of the Unaffiliated Standby Purchasers, acting in good faith, shall
        have waived the condition contained in Section 5(k) of the Other Standby
        Purchase Commitment to which such Unaffiliated Standby Purchaser is a
        party or (B) the Standby Purchaser may not assert the condition
        contained in either clause (i) or clause (ii) above if the sole reason
        for the failure of such condition to be satisfied is an appeal, a motion
        for reconsideration or similar action taken by any present or former
        officer of any Debtor considered or determined by the FCC to be an
        alleged or actual wrongdoer for purposes of the FCC Proceeding;

               (l) any applicable waiting period under the HSR Act shall have
        expired or been terminated early; and
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9


               (m) Arch shall have filed with the SEC no later than Friday,
        August 21, 1998 a preliminary Proxy Statement which shall not include
        any information that a reasonable investor would consider important in
        determining whether to make an investment decision regarding a purchase
        of Existing Arch Common Stock and would view its disclosure as
        significantly altering the total mix of information otherwise contained
        therein, which information is not included in the Draft Proxy Statement;
        provided, however, that the Standby Purchaser may not assert the
        condition in this clause (m) unless (i) the information with respect to
        which the Standby Purchaser seeks to assert such condition relates to
        information other than the descriptions of the Merger, the Plan and the
        other exhibits thereto contained in the preliminary Proxy Statement and
        (ii) such condition is asserted by the Standby Purchaser not later than
        two business days after Arch delivers to the Standby Purchaser a copy of
        the preliminary Proxy Statement as filed with the SEC indicating the
        changes therein from the Draft Proxy Statement (which copy Arch will
        deliver as promptly as practicable following filing the same with the
        SEC).

The Standby Purchaser hereby acknowledges and agrees that (i) the entities with
an asterisk next to their names on Annex I hereto (the "Affiliated Standby
Purchasers") shall be deemed to be affiliates of each other for purposes of
clauses (a) and (k) above and clause (iii) of Section 6 below, and (ii) the
Affiliated Standby Purchasers will act jointly with respect to any decisions to
waive the condition contained in any such clause and the corresponding clause
contained in the Other Standby Purchase Commitments to which such Affiliated
Standby Purchasers are parties (with the vote of the Affiliated Standby
Purchasers holding at least 85% of the aggregate amount of Unsecured Claims held
by such Affiliated Standby Purchasers to control with respect to the taking of
any such action).

        6. Additional Condition. The Commitment is subject to the further
condition that there shall not have occurred between the Buyer Balance Sheet
Date and the Confirmation Date, and, if the Effective Date does not occur within
90 days following the Confirmation Date, between the Buyer Balance Sheet Date
and the Effective Date (i) any event or events (other than events which affect
generally the economy or the industry in which Arch and MobileMedia conduct
their respective businesses) which has had or would have a material adverse
effect on the business, assets (including licenses, franchise and other
intangible assets), financial condition, operating income or prospects
(determined in each case, where applicable, in accordance with generally
accepted accounting principles and in a manner consistent with the past
practices of Arch and MobileMedia) of Arch, MobileMedia and their respective
subsidiaries, taken as a whole (collectively, the "Combined Company") (a
"Combined Company Material Adverse Effect"), (ii) any event or events involving
a regulatory or statutory change and affecting generally the industry in which
Arch and MobileMedia conduct their respective businesses which would materially
and adversely affect the ability of the Combined Company to operate its
business, or (iii) any event or events affecting generally the industry in which
Arch and MobileMedia conduct their respective business which would materially
and adversely affect the ability of the Combined Company to operate its
business; provided, however, that the Standby Purchaser may not assert
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10


the condition contained in this clause (iii) if each of the Unaffiliated Standby
Purchasers, acting in good faith, shall have waived the condition in Section
6(iii) of the Other Standby Purchase Commitment to which such Unaffiliated
Standby Purchaser is a party.

        7. Consideration for the Commitment. In consideration for the
Commitment, on the Effective Date at the Closing the Standby Purchaser will
receive its pro rata share of Arch Warrants entitling the holders thereof to
purchase, in the aggregate, a number of shares of Existing Arch Common Stock
equal to 2.50% of the issued and outstanding shares of Existing Arch Common
Stock and, if applicable, Arch Class B Common Stock, computed on a Fully Diluted
Basis (as defined in the Plan) on the date the "Buyer Market Price" is
determined in accordance with Schedule II to the Merger Agreement giving effect
to the Plan as if the Effective Date had occurred on such date and assuming
21,067,110 shares of Existing Arch Common Stock are issued and outstanding
immediately prior thereto. Such Arch Warrants will be delivered to the Standby
Purchaser and the Other Standby Purchasers, in accordance with the percentages
specified in Column D of Annex I hereto.

        8. Satisfaction of the Commitment. The Standby Purchaser may, in its
sole discretion, satisfy the Commitment directly and/or indirectly through one
or more of its affiliates, separate accounts within its control or investment
funds under its or its affiliates' management.

        9. Representations and Warranties. (a) Arch hereby represents and
warrants to the Standby Purchaser that:

                      (i) Arch is a corporation duly organized, validly existing
               and in good standing under the laws of the State of Delaware and
               has all requisite corporate power and authority to execute,
               deliver and perform its obligations hereunder and to consummate
               the transactions contemplated hereby;

                      (ii) Subject to the approval of the Buyer Charter
               Amendment and the Buyer Share Issuance by the Stockholders of
               Arch, the execution, delivery and performance of this letter
               agreement by Arch and the consummation by Arch of the
               transactions contemplated hereby have been duly and validly
               authorized by all necessary corporate action on the part of Arch;

                      (iii) This letter agreement constitutes the legal, valid
               and binding obligation of Arch, enforceable against Arch in
               accordance with its terms;

                      (iv) Except as described in Section 3.3 of the Buyer
               Disclosure Schedule and except for the applicable requirements of
               the Securities Act, the Exchange Act and any applicable state and
               foreign securities laws, the HSR Act, the Communications Act and
               the regulations of the FCC, state public utility,
               telecommunications or public service laws and the Bankruptcy
               Code, the
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11


               Confirmation Order and the Amended Plan (collectively, the
               "Applicable Requirements"), the execution, delivery and
               performance of this letter agreement by Arch and the consummation
               by Arch of the transactions contemplated hereby in accordance
               with the terms hereof do not and will not conflict with, violate
               or constitute a breach of any material contract, agreement or
               instrument by which Arch is bound or any judgment, order, decree,
               law, statute, rule, regulation or other judicial or governmental
               restriction to which Arch is subject;

                      (v) Except as described in the Buyer Disclosure Schedule,
               the representations and warranties of Arch contained in the
               Merger Agreement (other than those contained in Sections 3.6,
               3.7, 3.26 and 3.27 thereof), which representations and warranties
               shall be deemed for purposes of this clause (v) not to include
               any qualification or limitation with respect to materiality
               (whether by reference to "Buyer Material Adverse Effect" or
               otherwise), are true and correct, except where the matters in
               respect of which such representations and warranties are not true
               and correct would not have a Buyer Material Adverse Effect;

                      (vi) True, complete and correct copies of the following
               documents are attached hereto as indicated:


                                 Document                     Exhibit Hereto
               --------------------------------------------   --------------
               Merger Agreement (including all exhibits              A
               and schedules thereto)

               Buyer Disclosure Schedule                             B

               Other Standby Purchase Commitments                    C

               Certificate of Incorporation of Arch, as              D
               amended through the date hereof

               By-laws of Arch, as amended through the               E
               date hereof

               Rights Agreement, dated as of October 13,             F
               1995, between Arch and the Bank of New
               York, as Rights Agent, as amended
               through the date hereof  (the "Rights
               Agreement")

               Draft of the Proxy Statement dated                    G
               August 18, 1998 (the "Draft Proxy
               Statement")
               
               
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 12


                                 Document                     Exhibit Hereto
               ----------------------------------------       --------------
               Existing Registration Rights Agreements               H
               (as defined in Section 9(a)(xi) below),

               Bridge Commitment Letter                              I
  
                      (vii) As of the date hereof, the Draft Proxy Statement
               contains no untrue statement of a material fact or omits to state
               any material fact necessary, in light of the circumstances under
               which it was made, in order to make the statements therein not
               misleading; provided, however, Arch makes no representation with
               respect to either (A) information supplied by MobileMedia for
               inclusion therein or (B) the descriptions of the Merger
               Agreement, the Plan and the other exhibits to the Merger
               Agreement, and of this letter agreement and the Other Standby
               Purchase Commitments, contained therein;

                      (viii) No representation or warranty of Arch contained in
               this letter agreement, and no statement relating to Arch
               contained in the Merger Agreement, the Buyer Disclosure Schedule
               or any other document, certificate or other instrument delivered
               or to be delivered by or on behalf of Arch pursuant to this
               letter agreement (including the definitive Proxy Statement and
               the Registration Statement as declared effective by the SEC),
               contains or will as of the Effective Date contain any untrue
               statement of a material fact or omits or will as of the Effective
               Date omit to state any material fact necessary, in light of the
               circumstances under which it was or will be made, in order to
               make the statements herein or therein not misleading;

                      (ix) Between the Buyer Balance Sheet Date and the date
               hereof, there has not occurred with respect to Arch (A) any event
               or events (other than events which affect generally the economy
               or the industry in which Arch and MobileMedia conduct their
               respective businesses) which has had or would have a Combined
               Company Material Adverse Effect or (B) any event or events
               involving a regulatory or statutory change and affecting
               generally the industry in which Arch and MobileMedia conduct
               their respective business which would materially and adversely
               affect the ability of the Combined Company to operate its
               business;

                      (x) The shares of Existing Arch Common Stock to be issued
               and distributed as contemplated by Section 1.3(e) and Section 1.6
               of the Merger Agreement and the shares of Existing Arch Common
               Stock, the shares of Arch Class B Common Stock, if applicable,
               and the Arch Warrants to be issued and delivered as contemplated
               by Section 1 and Section 3 above, and the Arch Warrants to be
               issued as contemplated by Section 7 above, in each case when so
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 13


               issued and distributed or delivered, as the case may be, and the
               shares of Existing Arch Common Stock issued upon conversion of
               such shares of Arch Class B Common Stock, if applicable, when so
               converted in accordance with the Arch Charter Amendment, and the
               shares of Existing Arch Common Stock issued upon exercise of such
               Arch Warrants, when issued, paid for and delivered as provided in
               the Arch Warrant Agreement, will be duly authorized, validly
               issued, fully paid, nonassessable and free of all preemptive
               rights; and

                      (xi) Schedule 9(a)(xi) hereto sets forth a true, complete
               and correct list of all agreements that are in effect as of the
               date hereof pursuant to which the Company has granted any
               registration rights to any person or entity (the "Existing
               Registration Rights Agreements"), and, except as specified in
               Schedule 9(a)(xi) hereto, none of the Existing Registration
               Rights Agreements is inconsistent with the rights to be granted
               to the Standby Purchaser pursuant to the Registration Rights
               Agreement.

               (b) MobileMedia hereby represents and warrants to the Standby
Purchaser that:

                      (i) MobileMedia is a corporation duly organized, validly
               existing and in good standing under the laws of the State of
               Delaware and, subject to the entry of the Confirmation Order, has
               all requisite corporate power and authority to execute, deliver
               and perform its obligations hereunder and to consummate the
               transactions contemplated hereby;

                      (ii) Subject to the entry of the Confirmation Order, the
               execution, delivery and performance of this letter agreement by
               MobileMedia and the consummation by MobileMedia of the
               transactions contemplated hereby have been duly and validly
               authorized by all necessary corporate action on the part of
               MobileMedia;

                      (iii) Subject to the entry of the Confirmation Order and
               the effectiveness of the Plan, this letter agreement constitutes
               the legal, valid and binding obligation of MobileMedia,
               enforceable against MobileMedia in accordance with its terms;

                      (iv) Subject to entry of the Confirmation Order, and
               except as described in Section 2.3 of the Company Disclosure
               Schedule and except for the Applicable Requirements, the
               execution, delivery and performance of this letter agreement by
               MobileMedia and the consummation by MobileMedia of the
               transactions contemplated hereby in accordance with the terms
               hereof do not and will not conflict with, violate, or constitute
               a breach of any material contract, agreement or instrument by
               which MobileMedia is bound or any judgment, order, decree, law,
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 14


               statute, rule, regulation or other judicial or governmental
               restriction to which MobileMedia is subject;

                      (v) Except as described in the Company Disclosure
               Schedule, the representations and warranties of MobileMedia
               contained in the Merger Agreement (other than those contained in
               Sections 2.6, 2.7, 2.23 and 2.24 thereof), which representations
               and warranties shall be deemed for purposes of this clause (v)
               not to include any qualification or limitation with respect to
               materiality (whether by reference to "Company Material Adverse
               Effect" or otherwise), are true and correct, except where the
               matters in respect of which such representations and warranties
               are not true and correct would not have a Company Material
               Adverse Effect;

                      (vi) True, complete and correct copies of the following
               documents are attached hereto as indicated:

                                 Document                     Exhibit Hereto
               --------------------------------------------   --------------
               Merger Agreement (including all exhibits              A
               and schedules thereto)

               Other Standby Purchase Commitments                    C

               Company Disclosure Schedule                           J

               Agreement, dated the date hereof (the                 K
               "Debtor/Committee Agreement"), between
               MobileMedia, on behalf of itself and the
               other Debtors, and the Committee (as
               defined in the Plan)

                      (vii) As of the date hereof, the information included in
               the Draft Proxy Statement that was provided for inclusion therein
               by MobileMedia contains no untrue statement of a material fact or
               omits to state any material fact necessary, in light of the
               circumstances under which it was made, in order to make the
               statements therein not misleading;

                      (viii) No representation or warranty of MobileMedia
               contained in this letter agreement, and no statement relating to
               MobileMedia contained in the Merger Agreement, the Company
               Disclosure Schedule or any other document, certificate, or other
               instrument delivered or to be delivered by or on behalf of
               MobileMedia pursuant to this letter agreement, contains or will
               as of the Effective Date contain any untrue statement of a
               material fact or omits or will as of the
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 15


               Effective Date omit to state any material fact necessary, in
               light of the circumstances under which it was or will be made, in
               order to make the statements herein or therein not misleading;
               and

                      (ix) Between the Company Balance Sheet Date and the date
               hereof, there has not occurred with respect to MobileMedia (A)
               any event or events (other than events which affect generally the
               economy or the industry in which Arch and MobileMedia conduct
               their respective businesses) which has had or would have a
               Combined Company Material Adverse Effect or (B) any event or
               events involving a regulatory or statutory change and affecting
               generally the industry in which Arch and MobileMedia conduct
               their respective businesses which would materially and adversely
               affect the ability of the Combined Company to operate its
               business.

               (c) The Standby Purchaser hereby represents and warrants to each
of Arch and MobileMedia that:

                      (i) The Standby Purchaser is a corporation duly organized
               and validly existing under the laws of the State of Wisconsin and
               has all requisite corporate power and authority to execute,
               deliver and perform its obligations hereunder and to consummate
               the transactions contemplated hereby;

                      (ii) The execution, delivery and performance of this
               letter agreement by the Standby Purchaser and the consummation by
               the Standby Purchaser of the transactions contemplated hereby
               have been duly and validly authorized by all necessary corporate
               action on the part of the Standby Purchaser;

                      (iii) This letter agreement constitutes the legal, valid
               and binding obligation of the Standby Purchaser, enforceable
               against the Standby Purchaser in accordance with its terms;

                      (iv) Except for the Applicable Requirements, the
               execution, delivery and performance of this letter agreement by
               the Standby Purchaser and the consummation by the Standby
               Purchaser of the transactions contemplated hereby in accordance
               with the terms hereof do not and will not conflict with, violate
               or constitute a breach of any material contract, agreement, or
               instrument by which the Standby Purchaser is bound or any
               judgment, order, decree, law, statute, rule, regulation or other
               judicial or governmental restriction to which the Standby
               Purchaser is subject, except where such conflicts, violations or
               breaches, individually or in the aggregate, would not have a
               material adverse effect on the ability of the Standby Purchaser
               to consummate the transactions contemplated hereby;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 16


                      (v) No representation or warranty of the Standby Purchaser
               contained in this letter agreement, and no statement contained in
               any other document, certificate or other instrument delivered or
               to be delivered by or on behalf of the Standby Purchaser pursuant
               to this letter agreement, contains or will as of the Effective
               Date contain any untrue statement of a material fact or omits or
               will as of the Effective Date omit to state any material fact
               necessary, in light of the circumstances under which it was or
               will be made, in order to make the statements herein or therein
               not misleading; and

                      (vi) As of the date hereof, the Standby Purchaser holds
               the aggregate stated principal amount of 9 3/8% Notes and 10 1/2%
               Notes (as such terms are defined in the Plan) indicated under the
               Standby Purchaser's name and address on Annex I hereto.

               (d) None of the representations and warranties made herein or in
any certificate to be delivered as contemplated hereby will survive the Closing.

        10. Certain Covenants. (a) Each of Arch and MobileMedia (i) acknowledges
that the Debtors have agreed to provide to the Committee copies of any and all
notices, documents or information to be provided by or made available by the
Debtors to Arch pursuant to the Merger Agreement or provided by or made
available by Arch to the Debtors pursuant to the Merger Agreement, promptly
after the receipt or provision thereof by or to the Debtors, as applicable, and
that the Committee, pursuant to the undertaking attached as Annex II hereto, has
agreed to distribute copies of the same to the Standby Purchaser and to take
certain other actions and (ii) agrees that the Committee may do so.

               (b) Without limiting the generality of the foregoing clause (a)
of this Section 10, Arch will, before filing the Registration Statement with the
SEC, furnish to the Standby Purchaser and its counsel copies of the Registration
Statement (including all exhibits thereto) proposed to be filed, will provide
the Standby Purchaser and its counsel a reasonable opportunity to review and
comment on such Registration Statement and will not file such Registration
Statement if the Standby Purchaser shall reasonably object thereto within three
calendar days after the receipt thereof.

               (c) Arch will deliver to the Standby Purchaser copies of the
definitive Proxy Statement in the form filed with the SEC and mailed to
Stockholders of Arch and the Registration Statement in the form declared
effective by the SEC.

               (d) Without limiting the generality of the foregoing clause (a)
of this Section 10, Arch will, before filing the Shelf Registration Statement or
any pre-effective amendment thereto, furnish to the Standby Purchaser and its
counsel copies of the Shelf Registration Statement or such pre-effective
amendment thereto, as applicable, proposed to be
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 17


filed, will provide Standby Purchaser and its counsel with a reasonable
opportunity to review and comment on the Shelf Registration Statement or such
pre-effective amendment thereto, as applicable, and will not file the Shelf
Registration Statement or such pre-effective amendment thereto, as applicable,
to which the Standby Purchaser or its counsel shall reasonably object within
three business days after the receipt thereof. The Standby Purchaser will
furnish to Arch such information regarding the Standby Purchaser and its plan
and method of distribution of the Registrable Securities as Arch may reasonably
request in writing in connection with the preparation of the Shelf Registration
Statement.

               (e) Each of Arch, MobileMedia and the Standby Purchaser will use
its reasonable best efforts to obtain all approvals, waivers, consents and other
authorizations required by the Applicable Requirements, including without
limitation the applicable requirement of the HSR Act, necessary in connection
with the performance of this letter agreement by the Standby Purchaser and the
consummation by the Standby Purchaser of the transactions contemplated hereby.

               (f) Arch will, as requested by the Standby Purchaser, either pay
directly to the appropriate Governmental Entity, on behalf of the Standby
Purchaser, or reimburse the Standby Purchaser for, any fees required to be paid
by the Standby Purchaser in connection with its compliance with the applicable
requirements of the HSR Act. In addition, following the Effective Date, Arch
will reimburse, promptly upon written request (accompanied by appropriate
supporting documentation), costs and expenses (including without limitation
reasonable fees and expenses of legal counsel, including a reasonable allocation
with respect to the cost of any internal counsel), incurred by the Standby
Purchaser in connection with this letter agreement and the transactions
contemplated hereby; provided, however, the reimbursable costs and expenses of
the Affiliated Standby Purchaser shall not exceed $100,000 in the aggregate.

        11. Certain Prohibited Transactions. The Standby Purchaser hereby
covenants that, from and after the date hereof, so long as its commitment
hereunder remains in effect, it will not sell, or enter into any agreement
relating to the sale (including without limitation any short sale, equity swap
or other hedge position) of, any shares of Arch capital stock or, except as
otherwise expressly contemplated by this Section 11, engage in any other
disposition of such shares that might negatively affect the market price of such
shares; provided, however, that the foregoing provision will not apply to any
agreement entered into prior to the date hereof (if not entered into in
contemplation of the transactions contemplated by the Plan, the Merger Agreement
or this letter agreement) or any transaction effected pursuant to the terms
thereof. Notwithstanding the immediately preceding sentence, but subject to
Section 3 above and Section 12 below, the Standby Purchaser may at any time, as
it may determine in its sole and absolute discretion, sell or otherwise
transfer, or acquire, or enter into any agreement relating to the sale, transfer
or acquisition of, Rights or Unsecured Claims. The Standby Purchaser
acknowledges that it has received copies of the Rights Agreement and the
amendment thereto attached as Exhibit D to the Merger Agreement (the "Rights
Plan Amendment"). Arch hereby covenants that it will not,
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 18


without the prior written consent of the Standby Purchaser, further amend the
Rights Agreement in any manner that would eliminate or reduce the ownership
thresholds applicable to the Standby Purchaser thereunder; provided, however,
that this sentence shall cease to be of any further force or effect at such time
after the Effective Date as the Standby Purchaser ceases to beneficially own in
the aggregate at least 10.0% of the outstanding shares of Existing Arch Common
Stock.

        12. Voting Agreement. The Standby Purchaser hereby covenants that (a) so
long as the Bankruptcy Court approves the Disclosure Statement not later than
December 31, 1998 and the Confirmation Order is entered not later than March 31,
1999, (i) it will vote, or cause to be voted, for the acceptance of the Plan all
Unsecured Claims held by it on the date fixed for determining holders of
Unsecured Claims entitled to vote for acceptance or rejection of the Plan (the
"Record Date"), (ii) it will not withdraw or otherwise revoke, or cause to be
withdrawn or otherwise revoked, such vote for the acceptance of the Plan, and
(iii) it will not grant, or cause to be granted, to any other person or entity
any proxy to vote with respect to any such Unsecured Claims (other than a proxy
to vote for the acceptance of the Plan) and (b) except with respect to accounts
which cease to be within the Standby Purchaser's control and investment funds
which cease to be under its management, it will not, on or prior to the Record
Date, sell or otherwise transfer any Unsecured Claims held by it unless the
transferee shall have agreed in writing in the form attached as Annex III hereto
(i) to vote for the acceptance of the Plan with respect to such Unsecured Claims
and (ii) not to sell or otherwise transfer such Unsecured Claims unless its
transferee shall agree to be bound in the same manner provided in this clause
(b) with respect to such Unsecured Claims.

        13. Other Standby Purchase Commitments. (a) Each of Arch and MobileMedia
covenants that it will not agree to any amendment or modification to any of the
letter agreements, dated the date hereof, among Arch, MobileMedia and any of the
Other Standby Purchasers (the "Other Standby Purchase Commitments"), without the
prior written consent of the Standby Purchaser. Notwithstanding the immediately
preceding sentence, Arch and MobileMedia may, without the prior written consent
of the Standby Purchaser, agree to an amendment or modification to any of the
Other Standby Purchase Commitments to the extent that (i) such amendment or
modification has the sole effect of reducing or eliminating the financial
commitment thereunder and (ii) simultaneously therewith, a qualified
institutional buyer (as such term is defined in Rule 144A promulgated under the
Securities Act) reasonably acceptable to the Standby Purchaser makes a
commitment in a corresponding amount on terms identical in all material respects
to those set forth in such Other Standby Purchase Commitment.

               (b) The Standby Purchaser will have no liability for the
commitment of any Other Standby Purchaser under any Other Standby Purchase
Commitments or the commitment of any other person contemplated by Section 13(a)
above.

        14. Certain Notices; Certain Information. (a) Each of Arch and
MobileMedia hereby covenants that it will promptly deliver to the Standby
Purchaser, and the Standby Purchaser
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 19


hereby covenants that it will promptly deliver to Arch and MobileMedia, written
notice of any matter, event or development that would (i) render any
representation or warranty made by it herein inaccurate or incomplete in any
respect or (ii) constitute or result in a breach by it of, or a failure by it to
comply with, any covenant herein applicable to it.

               (b) Each of Arch and MobileMedia will furnish the Standby
Purchaser with such information regarding itself as the Standby Purchaser may
reasonably request.

        15. Certain Consent Rights. (a) Notwithstanding anything to the contrary
herein contained, except as expressly contemplated by the Merger Agreement or
the Plan, Arch hereby covenants that it will not take, or agree in writing to
take, any action contemplated by Section 4.5(b)(ii), (iii), (iv), (viii) or (ix)
of the Merger Agreement without the prior written consent of the Standby
Purchaser.

               (b) Arch hereby covenants that, without the prior written consent
of the Standby Purchaser, it will not, prior to the Effective Date, enter into
any agreement with respect to its securities, or amend any existing agreement
with respect to its securities (including without limitation the Existing
Registration Rights Agreements) in any manner inconsistent with the rights to be
granted to the Standby Purchaser pursuant to the Registration Rights Agreement.

        16. Removal of Legends. In the event that, following the transactions
contemplated by the Merger Agreement, the Plan and this letter agreement, any
certificates evidencing securities ("Certificates") of Arch held by the Standby
Purchaser bear a restrictive legend then:

               (a) if the Standby Purchaser delivers to Arch (i) a certificate,
        in a form reasonably satisfactory to Arch, certifying that securities
        evidenced by such Certificate have been transferred pursuant to a
        registration statement that is effective under the Securities Act or
        (ii) a certificate, in a form reasonably satisfactory to Arch,
        certifying that securities evidenced by such Certificate have been
        transferred without registration in accordance with the requirements of
        Rule 144 under the Securities Act, Arch will, or will instruct its
        transfer agent to, issue upon surrender of such Certificate one or more
        new Certificates evidencing the securities so transferred evidenced by
        the Certificate so surrendered, which new Certificate or Certificates
        will not bear any such legend; and

               (b) if the Standby Purchaser delivers to Arch an opinion of
        counsel to the Standby Purchaser (which may be internal counsel to the
        Standby Purchaser) that, in the opinion of such counsel, such legend is
        not, or is no longer, required to ensure compliance with the Securities
        Act, Arch will, or will instruct its transfer agent to, issue upon
        surrender of such Certificate one or more new Certificates evidencing
        the securities evidenced by the Certificate so surrendered, which new
        Certificate or Certificates will not bear any such legend.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 20


                                     *    *    *    *    *

        If you are in agreement with the foregoing, please execute the enclosed
copy of this letter agreement as indicated and return it to the undersigned.
This letter agreement will become effective upon (i) the delivery to us of
executed counterparts of this letter agreement by each of you and (ii) the
execution and delivery of each of the Other Standby Purchase Commitments by each
of the parties thereto. Once effective, this letter agreement will terminate on
(i) the date on which the Debtor Tower Agreement is terminated, unless prior to
or simultaneously with such termination, MobileMedia shall have entered into a
definitive agreement (which shall be comparable in form and substance to the
Debtor Tower Agreement and a copy of which shall be delivered to the Standby
Purchaser promptly following execution thereof) with a bona fide third-party
purchaser providing for a sale to such third party of the assets or
substantially all of the assets to be sold to Pinnacle pursuant to the Debtor
Tower Agreement resulting in net proceeds to MobileMedia of not less than $165.0
million (an "Acceptable Sale"), (ii) December 31, 1998, unless the Closing (as
defined in the Debtor Tower Agreement) or the closing of an Acceptable Sale
shall have occurred on or before such date, (iii) March 31, 1999, unless the
Confirmation Order shall have been entered by the Bankruptcy Court on or before
such date, (iv) June 30, 1999, unless the effectiveness of the Plan occurs on or
before such date, or (v) if not theretofore terminated pursuant to one of the
foregoing clauses, the date on which the Merger Agreement is terminated in
accordance with the terms thereof.

        All notices and other communications hereunder must be in writing. Any
notice or other communication hereunder will be deemed duly delivered three
business days after it is sent by registered or certified mail, return receipt
requested, postage prepaid, or two business days after it is sent via a
reputable international overnight courier service, in each case to the intended
recipient at the address therefor set forth on the signature page hereto. Any
party hereto may give any notice or other communication hereunder by personal
delivery or telecopy, but no such notice or other communication will be deemed
to have been duly given unless and until it actually is received by the party
for whom it is intended. Any party may change the address to which notices and
other communications hereunder are to be delivered by giving the other parties
notice in the manner herein set forth.

        This letter agreement represents the final agreement among the parties
hereto with respect to the subject matter hereof and may not be contradicted by
evidence of prior or contemporaneous agreements of the parties. There are no
unwritten oral agreements between the parties relating to the subject matter
hereof. This letter agreement may not be amended or modified except by a written
instrument signed by each of the Standby Purchaser, Arch and MobileMedia.

        This letter agreement shall be governed by and construed in accordance
with the laws of the State of Delaware without regard to its principles of
conflicts of law.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 21


        This letter agreement may be executed in counterparts which, taken
together, shall constitute one and the same instrument.

                                  Very truly yours,

                                  The Northwestern Mutual Life
                                  Insurance Company


                                  By:
                                     ------------------------------------------
                                     Name:   Steven P. Swanson
                                     Its:    Authorized Representative

                                  Address:   720 E. Wisconsin Avenue
                                             Milwaukee, Wisconsin 53202
                                             Attention:  Securities Department


ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.


By:
   --------------------------------
Name:
     ------------------------------
Its:
    -------------------------------

Address:  1800 West Park Drive, Suite 250
            Westborough, MA  01581
            Attn:  Chairman and Chief
                    Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA  02109
               Attn:  Jay E. Bothwick
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 22


Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.


By:
   ------------------------------
Name:
     ----------------------------
Its:
    -----------------------------

Address:       Fort Lee Executive Park
               One Executive Drive, Suite 500
               Fort Lee, NJ  07024
               Attn:  Chairman - Restructuring

With copy to:  Sidley & Austin
               875 Third Avenue, Suite 1400
               New York, New York 10022
               Attn:  James D. Johnson
<PAGE>

                                                                         ANNEX I

                               COMMITMENT AMOUNTS
                              (dollars in millions)

<TABLE>
<CAPTION>
                                                  Column A           Column B           Column C       Column D
                                                  --------           --------           --------       --------

                                              Rights Exercise   Unexercised Rights       Total
                                                 Commitment         Commitment        Commitment      Commitment
Name and Address of Standby Purchasers           Amount (1)         Amount (2)           Amount       Percentage
- --------------------------------------          ------------       ------------         --------     -----------
<S>                                                <C>                <C>                <C>              <C>   
W.R. Huff Asset Management Co., L.L.C., as         $39.27             $35.80             $75.07           34.60%
   agent for its affiliates and discretionary                                           
   accounts                                                                             
67 Park Place, 9th Floor                                                                
Morristown, New Jersey  07960                                                           
Stated Principal Amount of 9 3/8% Notes:                                                
$    57,847,000                                                                         
Stated Principal Amount of 10 1/2% Notes:                                               
$    27,970,000                                                                         
                                                                                        
The Northwestern Mutual Life Insurance             $10.95              $9.97             $20.92            9.64%
   Company*                                                                             
720 East Wisconsin Avenue                                                               
Milwaukee, Wisconsin  53202                                                             
Stated Principal Amount of 9 3/8% Notes:                                                
$  19,776,000                                                                           
Stated Principal Amount of 10 1/2% Notes:                                               
$   3,350,000                                                                          
                                                                                        
The Northwestern Mutual Life Insurance              $2.65              $2.42              $5.07            2.34%
   Company for its Group Annuity Separate                                               
   Account*                                                                             
720 East Wisconsin Avenue                                                               
Milwaukee, Wisconsin  53202                                                             
Stated Principal Amount of 9 3/8% Notes:                                                
$     -0-                                                                           
Stated Principal Amount of 10 1/2% Notes                                                
$   7,000,000                                                                          
</TABLE>

- --------
* The Northwestern Mutual Life Insurance Company, The Northwestern Mutual Life
Insurance Company for its Group Annuity Separate Account and Northwestern Mutual
Series Fund, Inc. for the High Yield Bond Portfolio are affiliated entities for
purposes of clauses (a) and (k) of Section 5 and clause (iii) of Section 6.
<PAGE>

                               COMMITMENT AMOUNTS
                              (dollars in millions)

<TABLE>
<CAPTION>
                                                     Column A              Column B           Column C       Column D
                                                     --------              --------           --------       --------
                                                 Rights Exercise      Unexercised Rights       Total
                                                    Commitment            Commitment        Commitment      Commitment
Name and Address of Standby Purchasers              Amount (1)            Amount (2)           Amount       Percentage
- --------------------------------------             ------------          ------------         --------     -----------
<S>                                                     <C>                   <C>              <C>              <C>  
Northwestern Mutual Series Fund, Inc. for the           $.75                  $.69             $1.44            0.66%
   High Yield Bond Portfolio*                                                              
720 East Wisconsin Avenue                                                                  
Milwaukee, Wisconsin  53202                                                                
Stated Principal Amount of 9 3/8% Notes:                                                   
$        -0-                                                                               
Stated Principal Amount of 10 1/2% Notes:                                                  
$     2,000,000                                                                            
                                                                                           
Credit Suisse First Boston Corporation                $29.48                $26.88            $56.36           25.97%
11 Madison Avenue, 4th Floor                                                               
New York, New York 10010                                                                   
Stated Principal Amount of 9 3/8% Notes:                                                   
$   32,453,000                                                                             
Stated Principal Amount of 10 1/2% Notes:                                                  
$   35,930,000                                                                             
                                                                                           
Whippoorwill Associates, Inc., as general partner     $30.42                $27.72            $58.14           26.79%
   and/or agent for the parties set forth on                                               
   Schedule A hereto in the percentages noted                                              
   thereon                                                                                 
11 Martine Avenue                                                                          
White Plains, New York 10606                                                               
Stated Principal Amount of 9 3/8% Notes:                                                   
$   37,855,000                                                                             
Stated Principal Amount of 10 1/2% Notes:                                                  
$   31,410,000                                                                             
                                       Total:        $113.52               $103.48           $217.00          100.00%
                                                     -------               -------           -------
</TABLE>

(1)   The "Rights Exercise Commitment Amount", for each Standby Purchaser, shall
      mean an amount equal to the product of (i) the Rights Subscription Price
      (as defined in Schedule II to the Merger Agreement) and (ii) the number of
      Rights issuable in respect of an amount of Allowed Unsecured Claims
      derived from the principal amount of 9 3/8% Notes and the 10 1/2% Notes
      indicated under the Standby Purchaser's name on this Annex I held by such
      Standby Purchaser on the date hereof. The dollar amounts set forth under
      Column A are estimates provided for illustrative purposes only, based on
      the assumptions that (x) there is a total of $475 million of Allowed
      Unsecured Claims, (y) there is no Rights Reserve (as defined in the Plan)
      and (z) the aggregate amount of Subordinated Noteholder Claims (as defined
      in the Plan) is $441,819,762.

(2)   The "Unexercised Rights Commitment Amount", for each Standby Purchaser,
      shall mean an amount equal to (i) the Total Commitment Amount indicated in
      Column C for such Standby Purchaser less (ii) the Rights Exercise
      Commitment Amount for such Standby Purchaser. The dollar amounts set forth
      under Column B are estimates provided for illustrative purposes only,
      based on the estimates set forth in Column A.
<PAGE>

                                                                        ANNEX II
                                                                        --------

                                   UNDERTAKING
                                   -----------

               The Committee hereby undertakes to distribute to the Standby
Purchaser (until instructed by the Standby Purchaser to do otherwise) copies of
any and all notices, documents or information to be provided by or made
available by the Debtors to Arch pursuant to the Merger Agreement or provided by
or made available by Arch to the Debtors pursuant to the Merger Agreement that
are received by the Committee pursuant to the Debtor/Committee Agreement as soon
as practicable with its receipt thereof. The Committee hereby further undertakes
to consult with the Standby Purchaser (until instructed by the Standby Purchaser
to do otherwise) prior to delivering any written consent or exercising any other
right of the Committee (other than the distribution of notices, documents or
information to the Standby Purchaser or the Other Standby Purchasers) pursuant
to the Debtor/Committee Agreement or the Plan. The Committee will not enter into
any amendment to the Debtor/Committee Agreement without the prior written
consent of the Standby Purchaser.

                                            THE OFFICIAL COMMITTEE
                                            OF UNSECURED CREDITORS


                                            By:
                                               --------------------------------
                                            Its:
                                                -------------------------------
<PAGE>

                                                                       ANNEX III
                                                                       ---------

                                VOTING AGREEMENT
                                ----------------

        The undersigned transferee of indebtedness of MobileMedia Corporation or
one of its direct or indirect subsidiaries (collectively, "MobileMedia")
described in Schedule A attached hereto (the "Claim"), hereby acknowledges and
agrees as follows:

        1.     MobileMedia is a debtor-in-possession under Chapter 11 of the
               Bankruptcy Code and has proposed a First Amended Joint Plan of
               Reorganization dated August __, 1998 (the "Amended Plan").

        2.     By acquiring the Claim the undersigned may also acquire rights to
               vote on the adoption of the Amended Plan.

        3.     As a condition of the transfer of the Claim, the undersigned
               hereby agrees to exercise all voting rights it may have as holder
               of the Claim in favor of the Amended Plan unless the Amended Plan
               shall have been withdrawn.

        4.     The undersigned agrees that it shall not subsequently transfer
               the Claim or any portion thereof unless and until it obtains from
               its transferee a Voting Agreement identical to the form hereof.

        IN WITNESS HEREOF, the undersigned transferee has executed this Voting
Agreement this _____ day of __________, 199_.

                                            [TRANSFEREE]


                                            By:
                                               --------------------------------
                                               Title:


Accepted By:


- -------------------------
[Transferor]
<PAGE>

                                   SCHEDULE A
                                       TO
                                VOTING AGREEMENT

[Describe Claim.]
<PAGE>

                                                               SCHEDULE 9(a)(xi)
                                                               -----------------

Existing Registration Rights Agreement

(1)   Registration Rights Agreement, dated as of June 24, 1998, by and among
      Arch Communications Group, Inc., Sandler Capital Partner, 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, as amended

(2)   Registration Rights Agreement, dated as of June 29, 1998, Arch
      Communications Group, Inc. Adelphia Communications Corporation and
      Lisa-Gaye Shearing

Inconsistencies:

The provisions of the Registration Rights Agreement listed at (2) above are
inconsistent in certain respects with the provisions of the Registration Rights
Agreement.
<PAGE>

                                                                       Exhibit J
                                                                       ---------


                     W.R. HUFF ASSET MANAGEMENT CO., L.L.C.
                           67 Park Place, Ninth Floor
                          Morristown, New Jersey 07960



                                 August 18, 1998


Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts  01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey  07024

               Re:    Commitment to Purchase Stock and Warrants
                      -----------------------------------------

Gentlemen:

        Arch Communications Group, Inc., a Delaware corporation ("Arch"), and
MobileMedia Communications, Inc., a Delaware corporation ("MobileMedia"), intend
to engage in a business combination transaction (the "Combination") as part of a
reorganization (the "Reorganization") of MobileMedia, MobileMedia Corporation,
the sole stockholder of MobileMedia ("Parent"), and all of MobileMedia's
subsidiaries (collectively, the "Debtors") pursuant to chapter 11 of title 11,
United States Code, 11 U.S.C. ss.ss. 101 et seq. (the "Bankruptcy Code"). It is
our understanding that in connection with the Reorganization, among other
things: (a) pursuant to the Agreement and Plan of Merger, dated as of the date
hereof (the "Merger Agreement"), among Arch, a wholly owned subsidiary of Arch
("Merger Sub"), Parent and MobileMedia, MobileMedia will merge with and into
Merger Sub, with Merger Sub continuing as the surviving corporation and a wholly
owned subsidiary of Arch; (b) pursuant to the Merger Agreement, Arch will make
available for distribution pursuant to a plan of reorganization of the Debtors
in the form attached as Exhibit A to the Merger Agreement, with such amendments
and modifications thereto as are made in a manner consistent with clause (e) of
Section 5 hereto (such plan of reorganization being referred to herein as the
"Plan"), (i) cash, (ii) shares of its Common Stock, par value $.01 per share
("Existing Arch Common Stock"), and (iii) warrants entitling the holders thereof
to purchase shares of Existing Arch Common Stock ("Arch Warrants"), with such
Arch Warrants to be issued pursuant to, and to have the terms set forth in, a
warrant agreement in the form attached as Exhibit B to the Merger Agreement (the
"Arch Warrant Agreement"); (c) holders of unsecured non-priority claims against
the Debtors ("Unsecured Claims"), to the extent such Unsecured
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2

Claims are Allowed (as defined in the Plan), will receive pursuant to the Plan
(i) shares of Existing Arch Common Stock and (ii) rights to purchase ("Rights")
for cash units consisting of (A) shares of Existing Arch Common Stock and (B)
Arch Warrants; (d) holders of claims arising under or relating to the Credit
Agreement, dated December 4, 1995, as amended, among MobileMedia and the other
parties thereto ("Secured Claims"), to the extent such Secured Claims are
Allowed, will receive pursuant to the Plan cash in an amount equal to 100% of
such claims; (e) all of the outstanding equity interests in MobileMedia and
Parent will be canceled without consideration and Parent will be dissolved; and
(f) the commitments under the DIP Loan Agreement will terminate and all amounts
owed under or in respect of the DIP Loan Agreement will be paid in full in cash.

        Terms used herein with initial capital letters that are not otherwise
defined shall have the meanings ascribed to such terms in the Merger Agreement.

        1.     The Commitment. In connection with the foregoing, W.R. Huff Asset
Management Co., L.L.C. (the "Standby Purchaser") hereby advises you of its 
commitment (the "Commitment"), subject to the conditions set forth herein:

               (a) to exercise any Rights distributed to it in respect of its
        Allowed Unsecured Claims in accordance with the Plan and not thereafter
        sold or transferred as permitted by Section 3 below to purchase units
        consisting of shares of Existing Arch Common Stock and Arch Warrants
        underlying such Rights, to the extent that the aggregate purchase price
        payable upon such exercise, as determined in accordance with Schedule II
        to the Merger Agreement (the "Subscription Price"), does not exceed the
        Rights Exercise Commitment Amount of the Standby Purchaser as set forth
        in Annex I hereto;

               (b) if (i) the Standby Purchaser sells or otherwise transfers any
        or all of (A) the Rights distributed to it in accordance with the Plan
        or (B) Unsecured Claims held by it as of the date hereof in respect of
        which Rights are to be distributed, in each case as permitted by Section
        3 below, and (ii) the Rights sold or transferred by the Standby
        Purchaser or the Rights distributed in respect of Unsecured Claims held
        by it as of the date hereof that are hereafter sold or transferred by
        the Standby Purchaser are not exercised prior to the expiration thereof
        (at which time such Rights will be void and will no longer be
        exercisable), to purchase for cash (based upon the Subscription Price
        payable upon exercise of such Rights) identical units consisting of
        shares of Existing Arch Common Stock and Arch Warrants underlying such
        unexercised Rights, to the extent that the aggregate purchase price
        therefor, together with the aggregate Subscription Price payable upon
        exercise of Rights exercised as contemplated by clause (a) above, does
        not exceed the Rights Exercise Commitment Amount of the Standby
        Purchaser as set forth in Annex I hereto; and
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3


               (c) if any Rights distributed in accordance with the Plan (other
        than (i) Rights distributed to the Standby Purchaser or the other
        holders of Unsecured Claims listed on Annex I hereto (the "Other Standby
        Purchasers") and retained by them (which Rights are referred to in
        Section 1(a) above and Section 1(a) of each of the Other Standby
        Purchase Commitments (as defined in Section 13(a) below)) or (ii)
        subject to Section 3(b) below, Rights distributed in respect of
        Unsecured Claims held by the Standby Purchaser or the Other Standby
        Purchasers as of the date hereof that are hereafter sold or transferred
        by them (which Rights are referred to in Sections 1(b) and 3 hereof and
        Section 1(b) and 3 of each of the Other Standby Purchase Commitments))
        remain unexercised upon the expiration thereof (at which time such
        Rights will be void and will no longer be exercisable), to purchase for
        cash (based on the Subscription Price payable upon exercise of such
        Rights) pro rata in accordance with and up to the Unexercised Rights
        Commitment Amount of the Standby Purchaser as set forth in Annex I
        hereto identical units consisting of shares of Existing Arch Common
        Stock and Arch Warrants underlying such unexercised Rights.

        2. Arch Class B Common Stock. (a) Notwithstanding anything to the
contrary herein contained, if the purchases by the Standby Purchaser
contemplated by Section 1 above would cause the Standby Purchaser, the Other
Standby Purchasers, and any other persons or entities who, when taken together
with any one or more of the Standby Purchaser and the Other Standby Purchasers,
would constitute a "person" or "group" as used in Section 13(d) or Section 14(d)
of the Exchange Act or Rule 13d-3 or Rule 13d-5 promulgated thereunder, or any
"affiliate" as defined in Rule 405 promulgated under the Securities Act of any
of them (collectively, the "Standby Class B Holders"), in the aggregate, to
beneficially own on the effective date of the Plan (the "Effective Date") shares
representing more than 49.0% of the capital stock of Arch generally entitled to
vote in the election of directors or more than 49.0% of the total voting power
of the capital stock of Arch, Arch will substitute shares of Class B Common
Stock, par value $.01 per share, of Arch ("Arch Class B Common Stock"), with
such Arch Class B Common Stock having the terms set forth in the form of
Certificate of Amendment to Certificate of Incorporation of Arch attached as
Exhibit F to the Merger Agreement (the "Arch Charter Amendment"), for shares of
Existing Arch Common Stock included in the units so purchased on a one-for-one
basis such that on the Effective Date the Standby Class B Holders, in the
aggregate, will beneficially own shares representing not more than 49.0% of the
capital stock of Arch generally entitled to vote in the election of directors
and not more than 49.0% of the total voting power of the capital stock of Arch,
all as provided in the Plan. For purposes of this letter agreement, "beneficial
ownership" shall be determined as provided in Rule 13d-3 and Rule 13d-5
promulgated under the Exchange Act, except that a person or entity shall be
deemed to have "beneficial ownership" of all securities that such person or
entity has the right to acquire, whether such right is exercisable immediately
or only after the passage of time.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4


               (b) For purposes of calculating the percentages referred to in
Section 2(a) above, it will be assumed that no additional Unsecured Claims are
allowed after the Effective Date and all of the shares of Existing Arch Common
Stock in the Creditor Stock Pool (as defined in the Plan) are distributed in
accordance with the Plan to the holders of Allowed Unsecured Claims as of the
Effective Date.

               (c) Substitution of shares of Class B Common Stock as
contemplated by Section 2(a) above will be effectuated as follows:

                      (i) first, to the extent that the Standby Purchaser or any
               Other Standby Purchaser beneficially owns shares of Existing Arch
               Common Stock as of the Effective Date, other than those acquired
               as contemplated by the Plan, the Merger Agreement, this letter
               agreement and the Other Standby Purchase Commitments ("Non-Plan
               Arch Shares"), among the Standby Purchaser and such Other Standby
               Purchaser pro rata based on ownership of Non-Plan Arch Shares up
               to an amount equal to the aggregate number of Non-Plan Arch
               Shares beneficially owned by them as of the Effective Date; and

                      (ii) second, if necessary, among the Standby Purchaser and
               the Other Standby Purchasers in accordance with the percentages
               set forth in Column D of Annex I hereto.

               (d) The Standby Purchaser hereby disclaims beneficial ownership
of any securities of Arch owned by the Other Standby Purchasers.

        3. Certain Transfer Restrictions. (a) Subject to Section 12 below, the
Standby Purchaser may (i) sell or otherwise transfer any or all of (A) the
Rights distributed to it in accordance with the Plan or (B) Unsecured Claims in
respect of which Rights are to be distributed or (ii) purchase or otherwise
acquire (A) Rights distributed to others in accordance with the Plan or (B)
Unsecured Claims in respect of which Rights are to be distributed; provided,
however, that, with respect to clause (i) of this sentence, (X)
contemporaneously with the consummation of any such sale or other transfer of
Rights or Unsecured Claims, the Standby Purchaser will notify Arch and
MobileMedia of the occurrence thereof and (Y) the Standby Purchaser will not
consummate any such sale or other transfer unless the transferee or transferees
of such Rights or Unsecured Claims shall have entered into a written agreement
(a "Tracking Agreement") (I) to notify the Standby Purchaser, Arch and
MobileMedia of any subsequent transfer by it of such Rights or Unsecured Claims
or any Rights distributed to it in respect of such Unsecured Claims and (II) not
to sell or otherwise transfer such Rights or Unsecured Claims or Rights
distributed to it in respect of such Unsecured Claims, unless its transferee or
transferees shall agree in writing to be bound in the same manner provided in
this clause (Y) with respect to any subsequent transfer by it.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5


        (b) Notwithstanding the provisions of clause (y) of the proviso in
Section 3(a) above, the Standby Purchaser may elect to sell or otherwise
transfer (i) any or all of the Rights distributed to it in accordance with the
Plan or (ii) Unsecured Claims in respect of which Rights are to be so
distributed, in either case without entering into a Tracking Agreement with its
transferee or transferees (any Rights so transferred and any Rights distributed
in respect of Allowed Claims so transferred, together with any Rights so
transferred and any Rights distributed in respect of Allowed Claims so
transferred by the Other Standby Purchasers pursuant to Section 3(b) of the
Other Standby Purchase Commitments, being referred to herein collectively as
"Untracked Rights"). Any Rights that remain unexercised upon expiration thereof
will be deemed to be "Section 3(b) Rights" up to, but not exceeding, the amount
of Untracked Rights. The Section 3(b) Rights shall be exercised as follows prior
to the application of Section 1(c) above and Section 1(c) of the Other Standby
Purchase Commitments: (A) the Standby Purchaser and the Other Standby Purchasers
will first be given the opportunity to purchase for cash (based on the
Subscription Price payable upon exercise of such Rights) units consisting of
shares of Arch Common Stock and Arch Warrants underlying a number of unexercised
Rights up to the amount of Section 3(b) Rights in accordance with the
percentages set forth in Column D of Annex I hereto and (B) to the extent such
units are not so purchased, the Standby Purchaser and any Other Standby
Purchasers that are responsible for the existence of the Section 3(b) Rights
will be required to purchase such units pro rata based on the number of Section
3(b) Rights resulting from their respective transfers. Nothing in this Section
3(b) will in any way reduce the commitment of the Standby Purchaser specified in
Section 1(c) above or the Unexercised Rights Commitment Amount as set forth in
Annex I hereto.

        4. The Closing. (a) Notwithstanding anything to the contrary herein
contained or the terms of the Rights or the Plan, subject to the conditions set
forth herein, on the Effective Date the Standby Purchaser, in satisfaction of
the Commitment, will deliver at the Closing (i) the aggregate Subscription Price
payable upon exercise of any Rights exercised by it and (ii) the purchase price
payable in consideration of any shares of Existing Arch Common Stock or, if
applicable, Arch Class B Common Stock and Arch Warrants to be otherwise
purchased by it pursuant to the Commitment; provided, however, that, if
requested by the Standby Purchaser in writing at least two business days prior
to the Effective Date, any cash to be distributed to the Standby Purchaser in
respect of Allowed Secured Claims pursuant to the Plan will, prior to the
distribution thereof pursuant to the Plan and in accordance with the instruction
included in such written request, be first applied, on behalf of the Standby
Purchaser, to the payment of such amounts payable on the Effective Date as
provided in this Section 4(a).

        (b) Upon payment of the amounts payable as provided in Section 4(a), on
the Effective Date at the Closing Arch will deliver to the Standby Purchaser (or
its designees) certificates representing the shares of Existing Arch Common
Stock, shares of Arch Class B Common Stock, if applicable, and the Arch
Warrants, in each case, (i) issuable upon exercise of
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6


any Rights exercised by the Standby Purchaser or (ii) otherwise purchased by the
Standby Purchaser pursuant to the Commitment.

        (c) Arch will deliver to the Standby Purchaser at least five business
days prior to the Effective Date a written notice which shall (i) specify the
amounts payable at the Closing by it in satisfaction of the Commitment, (ii)
specify the date on which the Effective Date is to occur and the last date on
which the notice referred to in Section 4(d) may to be delivered, and (iii)
indicate the matters required to be addressed in such notice.

        (d) At least two business days prior to the Effective Date, the Standby
Purchaser will deliver to Arch and MobileMedia a written notice which shall set
forth the number of shares of Existing Arch Common Stock beneficially owned by
it as of such date. During the period from the date of such notice through the
Effective Date, neither the Standby Purchaser nor any affiliate thereof shall
acquire beneficial ownership of, or any rights to acquire, any additional shares
of Existing Arch Common Stock or any Unsecured Claim.

        5. Certain Conditions. The Commitment is subject to the conditions that:

               (a) (i) the Confirmation Order (as defined in the Plan), in a
        form reasonably satisfactory to the Standby Purchaser, shall have been
        entered by the Bankruptcy Court (as defined in the Plan) and (ii) such
        Confirmation Order shall have become a Final Order (as defined in
        Section 5.1(h) of the Merger Agreement); provided, however, that (A) the
        Standby Purchaser may not assert the condition contained in clause (ii)
        above if each of the Other Standby Purchasers that is not affiliated
        with the Standby Purchaser (each, an "Unaffiliated Standby Purchaser"),
        acting in good faith, shall have waived the condition contained in
        Section 5(a) of the Other Standby Purchase Commitments to which such
        Unaffiliated Standby Purchaser is a party and (B) the Standby Purchaser
        may not assert the condition contained in either clause (i) or clause
        (ii) above if the sole reason for the failure of such condition to be
        satisfied is the failure or the threatened failure of the Standby
        Purchaser or any of its affiliates to fulfill the Commitment;

               (b) the satisfaction or, with the written consent of the Standby
        Purchaser, waiver of all conditions precedent to the obligations of each
        of the parties to the Merger Agreement contained in the Merger Agreement
        and all conditions precedent to the effectiveness of the Plan contained
        in the Plan; provided, however, that (i) the conditions contained in
        Section 5.1(e) and (h), Section 5.2(a), (b), (c), (d) and (e) and
        Section 5.3(a), (b), (c) and (e) of the Merger Agreement (collectively,
        the "Unilateral Conditions") may be waived without the written consent
        of the Standby Purchaser and (ii) the Standby Purchaser may not assert
        the condition contained in this clause (b) if the sole reason for the
        failure of such condition to be satisfied is the failure or the
        threatened failure of the Standby Purchaser or any of its affiliates to
        fulfill the Commitment;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7


               (c) there shall be effective under the Securities Act, a
        registration statement (the "Shelf Registration Statement") covering the
        resale by the Standby Purchaser of (i) all shares of Existing Arch
        Common Stock, all shares of Arch Class B Common Stock, if applicable,
        and all Arch Warrants received by the Standby Purchaser as a result of
        the transactions contemplated by the Plan (including those received upon
        the exercise of Rights and pursuant to this letter agreement) and (ii)
        all shares of Existing Arch Common Stock issuable upon conversion of any
        such shares of the Arch Class B Common Stock or exercise of any such
        Arch Warrants (the securities referred to in the foregoing clauses (i)
        and (ii) are referred to herein as the "Registrable Securities");

               (d) Arch shall have executed and delivered to the Standby
        Purchaser a registration rights agreement in the form attached as
        Exhibit C to the Merger Agreement (the "Registration Rights Agreement")
        granting the Standby Purchaser certain demand and piggyback registration
        rights with respect to the Registrable Securities;

               (e) any and all amendments or modifications to the Merger
        Agreement or any exhibit or schedule thereto (including without
        limitation the Plan, the Arch Charter Amendment, the Arch Warrant
        Agreement and the Registration Rights Agreement) on or after the date
        hereof and any consents or waivers delivered on or after the date hereof
        by Arch or MobileMedia to the other under the Merger Agreement (other
        than (i) subject to Section 15(a) below, consents under Section 4.5 of
        the Merger Agreement or (ii) waivers of Unilateral Conditions) shall
        have been in form and substance reasonably satisfactory to the Standby
        Purchaser;

               (f) the representations and warranties of Arch contained in this
        letter agreement shall be true and correct, in all material respects
        (except for the representations and warranties set forth at clauses
        (a)(v) and (a)(vi) of Section 9 below, which shall be true and correct
        in all respects, and except for the representations and warranties set
        forth at clauses (a)(vii) and (a)(viii) of Section 9 below, which shall
        be disregarded for purposes of this clause (f) insofar as they relate to
        financial projections), on the Effective Date, with the same effect as
        though such representations and warranties were made on the Effective
        Date, and Arch shall have performed or complied with, in all material
        respects, its covenants required to be performed or complied with under
        this letter agreement on or prior to the Effective Date (and Arch shall
        have delivered to the Standby Purchaser a certificate to the effect that
        each of the conditions specified in this clause (f) is satisfied in all
        respects);

               (g) the representations and warranties of MobileMedia contained
        in this letter agreement shall be true and correct, in all material
        respects (except for the representations and warranties set forth at
        clauses (b)(v) and (b)(vi) of Section 9 below, which shall be true and
        correct in all respects, and except for the representations and
        warranties set forth
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8


        at clauses (b)(vii) and (b)(viii) of Section 9 below, which shall be
        disregarded for purposes of this clause (f) insofar as they relate to
        financial projections), on the Effective Date, with the same effect as
        though such representations and warranties were made on the Effective
        Date, and MobileMedia shall have performed or complied with, in all
        material respects, its covenants required to be performed or complied
        with, under this letter agreement on or prior to the Effective Date (and
        MobileMedia shall have delivered to the Standby Purchaser a certificate
        to the effect that each of the conditions specified in this clause (g)
        is satisfied in all respects);

               (h) simultaneously with the transactions contemplated by Section
        4 above, Arch shall have performed its obligation under clause (e) of
        Section 1.3 of the Merger Agreement and any debt financing (other than
        secured bank financing) obtained by Arch to enable it to do so shall
        have terms no less favorable to Arch than those set forth in the Bridge
        Commitment Letter; provided, however, that the Standby Purchaser may not
        assert the condition contained in this clause (h) if the sole reason for
        the failure of such condition to be satisfied is the failure or
        threatened failure of the Standby Purchaser or any of its affiliates to
        fulfill the Commitment;

               (i) simultaneously with the transactions contemplated by Section
        4 above, each of the Other Standby Purchasers shall have fulfilled its
        commitment under the Other Standby Purchase Commitment to which it is a
        party, and, if applicable, any other person having a commitment
        contemplated by Section 13(a) hereof shall have fulfilled such
        commitment;

               (j) (i) the shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement shall be so issued and distributed pursuant to an
        exemption from registration under the Securities Act provided by Section
        1145 of the Bankruptcy Code, and (ii)(A) the issuance of the Rights, (B)
        the issuance of the shares of Existing Arch Common Stock, the shares of
        Arch Class B Common Stock, if applicable, and the Arch Warrants upon
        exercise of the Rights, (C) the issuance to the Standby Purchaser of the
        shares of Existing Arch Common Stock, the shares of Arch Class B Common
        Stock, if applicable, and the Arch Warrants as contemplated by Section 1
        and Section 3 above and the Arch Warrants as contemplated by Section 7
        below, and (D) the issuance of Existing Arch Common Stock upon exercise
        of the Arch Warrants or conversion of Arch Class B Common Stock, if
        applicable, shall be covered by the Registration Statement, the
        Registration Statement shall have been declared effective and no stop
        order with respect thereto shall be in effect;

               (k) (i) the FCC Grant shall have been issued by the FCC and (ii)
        such FCC Grant shall have become a Final Order (as defined in Section
        5.1(e) of the Merger Agreement); provided, however, that (A) the Standby
        Purchaser may not assert the
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9


        condition contained in clause (ii) above if each of the Unaffiliated
        Standby Purchasers, acting in good faith, shall have waived the
        condition contained in Section 5(k) of the Other Standby Purchase
        Commitment to which such Unaffiliated Standby Purchaser is a party or
        (B) the Standby Purchaser may not assert the condition contained in
        either clause (i) or clause (ii) above if the sole reason for the
        failure of such condition to be satisfied is an appeal, a motion for
        reconsideration or similar action taken by any present or former officer
        of any Debtor considered or determined by the FCC to be an alleged or
        actual wrongdoer for purposes of the FCC Proceeding;

               (l) any applicable waiting period under the HSR Act shall have
        expired or been terminated early; and

               (m) Arch shall have filed with the SEC no later than Friday,
        August 21, 1998 a preliminary Proxy Statement which shall not include
        any information that a reasonable investor would consider important in
        determining whether to make an investment decision regarding a purchase
        of Existing Arch Common Stock and would view its disclosure as
        significantly altering the total mix of information otherwise contained
        therein, which information is not included in the Draft Proxy Statement;
        provided, however, that the Standby Purchaser may not assert the
        condition in this clause (m) unless (i) the information with respect to
        which the Standby Purchaser seeks to assert such condition relates to
        information other than the descriptions of the Merger, the Plan and the
        other exhibits thereto contained in the preliminary Proxy Statement and
        (ii) such condition is asserted by the Standby Purchaser not later than
        two business days after Arch delivers to the Standby Purchaser a copy of
        the preliminary Proxy Statement as filed with the SEC indicating the
        changes therein from the Draft Proxy Statement (which copy Arch will
        deliver as promptly as practicable following filing the same with the
        SEC).

The Standby Purchaser hereby acknowledges and agrees that (i) the entities with
an asterisk next to their names on Annex I hereto (the "Affiliated Standby
Purchasers") shall be deemed to be affiliated with each other for purposes of
clauses (a) and (k) above and clause (iii) of Section 6 below, and (ii) the
Affiliated Standby Purchasers will act jointly with respect to any decision to
waive the condition contained in any such clause and the corresponding clause
contained in the Other Standby Purchase Commitments to which such Affiliated
Standby Purchasers are parties (with the vote of the Affiliated Standby
Purchasers holding at least 85% of the aggregate amount of Unsecured Claims held
by such Affiliated Standby Purchasers to control with respect to the taking of
any such action).

        6. Additional Condition. The Commitment is subject to the further
condition that there shall not have occurred between the Buyer Balance Sheet
Date and the Confirmation Date, and, if the Effective Date does not occur within
90 days following the Confirmation Date, between the Buyer Balance Sheet Date
and the Effective Date (i) any event or events (other than
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10


events which affect generally the economy or the industry in which Arch and
MobileMedia conduct their respective businesses) which has had or would have a
material adverse effect on the business, assets (including licenses, franchise
and other intangible assets), financial condition, operating income or prospects
(determined in each case, where applicable, in accordance with generally
accepted accounting principles and in a manner consistent with the past
practices of Arch and MobileMedia) of Arch, MobileMedia and their respective
subsidiaries, taken as a whole (collectively, the "Combined Company") (a
"Combined Company Material Adverse Effect"), (ii) any event or events involving
a regulatory or statutory change and affecting generally the industry in which
Arch and MobileMedia conduct their respective businesses which would materially
and adversely affect the ability of the Combined Company to operate its
business, or (iii) any event or events affecting generally the industry in which
Arch and MobileMedia conduct their respective business which would materially
and adversely affect the ability of the Combined Company to operate its
business; provided, however, that the Standby Purchaser may not assert the
condition contained in this clause (iii) if each of the Unaffiliated Standby
Purchasers, acting in good faith, shall have waived the condition in Section
6(iii) of the Other Standby Purchase Commitment to which such Unaffiliated
Standby Purchaser is a party.

        7. Consideration for the Commitment. In consideration for the
Commitment, on the Effective Date at the Closing the Standby Purchaser will
receive its pro rata share of Arch Warrants entitling the holders thereof to
purchase, in the aggregate, a number of shares of Existing Arch Common Stock
equal to 2.50% of the issued and outstanding shares of Existing Arch Common
Stock and, if applicable, Arch Class B Common Stock, computed on a Fully Diluted
Basis (as defined in the Plan) on the date the "Buyer Market Price" is
determined in accordance with Schedule II to the Merger Agreement giving effect
to the Plan as if the Effective Date had occurred on such date and assuming
21,067,110 shares of Existing Arch Common Stock are issued and outstanding
immediately prior thereto. Such Arch Warrants will be delivered to the Standby
Purchaser and the Other Standby Purchasers, in accordance with the percentages
specified in Column D of Annex I hereto.

        8. Satisfaction of the Commitment. The Standby Purchaser may, in its
sole discretion, satisfy the Commitment directly and/or indirectly through one
or more of its affiliates, separate accounts within its control or investment
funds under its or its affiliates' management.

        9. Representations and Warranties. (a) Arch hereby represents and
warrants to the Standby Purchaser that:

                      (i) Arch is a corporation duly organized, validly existing
               and in good standing under the laws of the State of Delaware and
               has all requisite corporate power and authority to execute,
               deliver and perform its obligations hereunder and to consummate
               the transactions contemplated hereby;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11


                      (ii) Subject to the approval of the Buyer Charter
               Amendment and the Buyer Share Issuance by the Stockholders of
               Arch, the execution, delivery and performance of this letter
               agreement by Arch and the consummation by Arch of the
               transactions contemplated hereby have been duly and validly
               authorized by all necessary corporate action on the part of Arch;

                      (iii) This letter agreement constitutes the legal, valid
               and binding obligation of Arch, enforceable against Arch in
               accordance with its terms;

                      (iv) Except as described in Section 3.3 of the Buyer
               Disclosure Schedule and except for the applicable requirements of
               the Securities Act, the Exchange Act and any applicable state and
               foreign securities laws, the HSR Act, the Communications Act and
               the regulations of the FCC, state public utility,
               telecommunications or public service laws and the Bankruptcy
               Code, the Confirmation Order and the Amended Plan (collectively,
               the "Applicable Requirements"), the execution, delivery and
               performance of this letter agreement by Arch and the consummation
               by Arch of the transactions contemplated hereby in accordance
               with the terms hereof do not and will not conflict with, violate
               or constitute a breach of any material contract, agreement or
               instrument by which Arch is bound or any judgment, order, decree,
               law, statute, rule, regulation or other judicial or governmental
               restriction to which Arch is subject;

                      (v) Except as described in the Buyer Disclosure Schedule,
               the representations and warranties of Arch contained in the
               Merger Agreement (other than those contained in Sections 3.6,
               3.7, 3.26 and 3.27 thereof), which representations and warranties
               shall be deemed for purposes of this clause (v) not to include
               any qualification or limitation with respect to materiality
               (whether by reference to "Buyer Material Adverse Effect" or
               otherwise), are true and correct, except where the matters in
               respect of which such representations and warranties are not true
               and correct would not have a Buyer Material Adverse Effect;

                      (vi) True, complete and correct copies of the following
               documents are attached hereto as indicated:


                                 Document                     Exhibit Hereto
               ----------------------------------------       --------------
               Merger Agreement (including all exhibits              A
               and schedules thereto)

               Buyer Disclosure Schedule                             B

               Other Standby Purchase Commitments                    C
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 12


                                 Document                     Exhibit Hereto
               ----------------------------------------       --------------
               Certificate of Incorporation of Arch, as              D
               amended through the date hereof
               
               By-laws of Arch, as amended through the               E
               date hereof
               
               Rights Agreement, dated as of October 13,             F
               1995, between Arch and the Bank of New
               York, as Rights Agent, as amended
               through the date hereof  (the "Rights
               Agreement")
               
               Draft of the Proxy Statement dated                    G
               August 18, 1998 (the "Draft Proxy
               Statement")
               
               Existing Registration Rights Agreements               H
               (as defined in Section 9(a)(xi) below),
               
               Bridge Commitment Letter                              I
               
                      (vii) As of the date hereof, the Draft Proxy Statement
               contains no untrue statement of a material fact or omits to state
               any material fact necessary, in light of the circumstances under
               which it was made, in order to make the statements therein not
               misleading; provided, however, Arch makes no representation with
               respect to either (A) information supplied by MobileMedia for
               inclusion therein or (B) the descriptions of the Merger
               Agreement, the Plan and the other exhibits to the Merger
               Agreement, and of this letter agreement and the Other Standby
               Purchase Commitments, contained therein;

                      (viii) No representation or warranty of Arch contained in
               this letter agreement, and no statement relating to Arch
               contained in the Merger Agreement, the Buyer Disclosure Schedule
               or any other document, certificate or other instrument delivered
               or to be delivered by or on behalf of Arch pursuant to this
               letter agreement (including the definitive Proxy Statement and
               the Registration Statement as declared effective by the SEC),
               contains or will as of the Effective Date contain any untrue
               statement of a material fact or omits or will as of the Effective
               Date omit to state any material fact necessary, in light of the
               circumstances under which it was or will be made, in order to
               make the statements herein or therein not misleading;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 13

                      (ix) Between the Buyer Balance Sheet Date and the date
               hereof, there has not occurred with respect to Arch (A) any event
               or events (other than events which affect generally the economy
               or the industry in which Arch and MobileMedia conduct their
               respective businesses) which has had or would have a Combined
               Company Material Adverse Effect or (B) any event or events
               involving a regulatory or statutory change and affecting
               generally the industry in which Arch and MobileMedia conduct
               their respective business which would materially and adversely
               affect the ability of the Combined Company to operate its
               business;

                      (x) The shares of Existing Arch Common Stock to be issued
               and distributed as contemplated by Section 1.3(e) and Section 1.6
               of the Merger Agreement and the shares of Existing Arch Common
               Stock, the shares of Arch Class B Common Stock, if applicable,
               and the Arch Warrants to be issued and delivered as contemplated
               by Section 1 and Section 3 above, and the Arch Warrants to be
               issued as contemplated by Section 7 above, in each case when so
               issued and distributed or delivered, as the case may be, and the
               shares of Existing Arch Common Stock issued upon conversion of
               such shares of Arch Class B Common Stock, if applicable, when so
               converted in accordance with the Arch Charter Amendment, and the
               shares of Existing Arch Common Stock issued upon exercise of such
               Arch Warrants, when issued, paid for and delivered as provided in
               the Arch Warrant Agreement, will be duly authorized, validly
               issued, fully paid, nonassessable and free of all preemptive
               rights; and

                      (xi) Schedule 9(a)(xi) hereto sets forth a true, complete
               and correct list of all agreements that are in effect as of the
               date hereof pursuant to which the Company has granted any
               registration rights to any person or entity (the "Existing
               Registration Rights Agreements"), and, except as specified in
               Schedule 9(a)(xi) hereto, none of the Existing Registration
               Rights Agreements is inconsistent with the rights to be granted
               to the Standby Purchaser pursuant to the Registration Rights
               Agreement.

               (b) MobileMedia hereby represents and warrants to the Standby
Purchaser that:

                      (i) MobileMedia is a corporation duly organized, validly
               existing and in good standing under the laws of the State of
               Delaware and, subject to the entry of the Confirmation Order, has
               all requisite corporate power and authority to execute, deliver
               and perform its obligations hereunder and to consummate the
               transactions contemplated hereby;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 14


                      (ii) Subject to the entry of the Confirmation Order, the
               execution, delivery and performance of this letter agreement by
               MobileMedia and the consummation by MobileMedia of the
               transactions contemplated hereby have been duly and validly
               authorized by all necessary corporate action on the part of
               MobileMedia;

                      (iii) Subject to the entry of the Confirmation Order and
               the effectiveness of the Plan, this letter agreement constitutes
               the legal, valid and binding obligation of MobileMedia,
               enforceable against MobileMedia in accordance with its terms;

                      (iv) Subject to entry of the Confirmation Order, and
               except as described in Section 2.3 of the Company Disclosure
               Schedule and except for the Applicable Requirements, the
               execution, delivery and performance of this letter agreement by
               MobileMedia and the consummation by MobileMedia of the
               transactions contemplated hereby in accordance with the terms
               hereof do not and will not conflict with, violate, or constitute
               a breach of any material contract, agreement or instrument by
               which MobileMedia is bound or any judgment, order, decree, law,
               statute, rule, regulation or other judicial or governmental
               restriction to which MobileMedia is subject;

                      (v) Except as described in the Company Disclosure
               Schedule, the representations and warranties of MobileMedia
               contained in the Merger Agreement (other than those contained in
               Sections 2.6, 2.7, 2.23 and 2.24 thereof), which representations
               and warranties shall be deemed for purposes of this clause (v)
               not to include any qualification or limitation with respect to
               materiality (whether by reference to "Company Material Adverse
               Effect" or otherwise), are true and correct, except where the
               matters in respect of which such representations and warranties
               are not true and correct would not have a Company Material
               Adverse Effect;

                      (vi) True, complete and correct copies of the following
               documents are attached hereto as indicated:

                                 Document                     Exhibit Hereto
               ----------------------------------------       --------------
               Merger Agreement (including all exhibits              A
               and schedules thereto)

               Other Standby Purchase Commitments                    C

               Company Disclosure Schedule                           J
   
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 15


                                 Document                     Exhibit Hereto
               -----------------------------------------      --------------
               Agreement, dated the date hereof (the                  K 
               "Debtor/Committee Agreement"), between
               MobileMedia, on behalf of itself and the 
               other Debtors, and the Committee (as
               defined in the Plan)

                      (vii) As of the date hereof, the information included in
               the Draft Proxy Statement that was provided for inclusion therein
               by MobileMedia contains no untrue statement of a material fact or
               omits to state any material fact necessary, in light of the
               circumstances under which it was made, in order to make the
               statements therein not misleading;

                      (viii) No representation or warranty of MobileMedia
               contained in this letter agreement, and no statement relating to
               MobileMedia contained in the Merger Agreement, the Company
               Disclosure Schedule or any other document, certificate, or other
               instrument delivered or to be delivered by or on behalf of
               MobileMedia pursuant to this letter agreement, contains or will
               as of the Effective Date contain any untrue statement of a
               material fact or omits or will as of the Effective Date omit to
               state any material fact necessary, in light of the circumstances
               under which it was or will be made, in order to make the
               statements herein or therein not misleading; and

                      (ix) Between the Company Balance Sheet Date and the date
               hereof, there has not occurred with respect to MobileMedia (A)
               any event or events (other than events which affect generally the
               economy or the industry in which Arch and MobileMedia conduct
               their respective businesses) which has had or would have a
               Combined Company Material Adverse Effect or (B) any event or
               events involving a regulatory or statutory change and affecting
               generally the industry in which Arch and MobileMedia conduct
               their respective businesses which would materially and adversely
               affect the ability of the Combined Company to operate its
               business.

               (c) The Standby Purchaser hereby represents and warrants to each
of Arch and MobileMedia that:

                      (i) The Standby Purchaser is a limited liability company
               duly organized, validly existing and in good standing under the
               laws of the State of Delaware and has all requisite limited
               liability company power and authority to execute, deliver and
               perform its obligations hereunder and to consummate the
               transactions contemplated hereby;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 16


                      (ii) The execution, delivery and performance of this
               letter agreement by the Standby Purchaser and the consummation by
               the Standby Purchaser of the transactions contemplated hereby
               have been duly and validly authorized by all necessary limited
               liability company action on the part of the Standby Purchaser;

                      (iii) This letter agreement constitutes the legal, valid
               and binding obligation of the Standby Purchaser, enforceable
               against the Standby Purchaser in accordance with its terms;

                      (iv) Except for the Applicable Requirements, the
               execution, delivery and performance of this letter agreement by
               the Standby Purchaser and the consummation by the Standby
               Purchaser of the transactions contemplated hereby in accordance
               with the terms hereof do not and will not conflict with, violate
               or constitute a breach of any material contract, agreement, or
               instrument by which the Standby Purchaser is bound or any
               judgment, order, decree, law, statute, rule, regulation or other
               judicial or governmental restriction to which the Standby
               Purchaser is subject, except where such conflicts, violations or
               breaches, individually or in the aggregate, would not have a
               material adverse effect on the ability of the Standby Purchaser
               to consummate the transactions contemplated hereby;

                      (v) No representation or warranty of the Standby Purchaser
               contained in this letter agreement, and no statement contained in
               any other document, certificate or other instrument delivered or
               to be delivered by or on behalf of the Standby Purchaser pursuant
               to this letter agreement, contains or will as of the Effective
               Date contain any untrue statement of a material fact or omits or
               will as of the Effective Date omit to state any material fact
               necessary, in light of the circumstances under which it was or
               will be made, in order to make the statements herein or therein
               not misleading; and

                      (vi) As of the date hereof, the Standby Purchaser holds
               directly, or indirectly through its affiliates, separate accounts
               within its control or investment funds under its or its
               affiliates' management, the aggregate stated principal amount
               93/8% Notes and 10 1/2% Notes (as such terms are defined in the
               Plan) indicated under the Standby Purchaser's name and address on
               Annex I hereto.

               (d) None of the representations and warranties made herein or in
any certificate to be delivered as contemplated hereby will survive the Closing.

        10. Certain Covenants. (a) Each of Arch and MobileMedia (i) acknowledges
that the Debtors have agreed to provide to the Committee copies of any and all
notices, documents or
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 17


information to be provided by or made available by the Debtors to Arch pursuant
to the Merger Agreement or provided by or made available by Arch to the Debtors
pursuant to the Merger Agreement, promptly after the receipt or provision
thereof by or to the Debtors, as applicable, and that the Committee, pursuant to
the undertaking attached as Annex II hereto, has agreed to distribute copies of
the same to the Standby Purchaser and to take certain other actions and (ii)
agrees that the Committee may do so.

               (b) Without limiting the generality of the foregoing clause (a)
of this Section 10, Arch will, before filing the Registration Statement with the
SEC, furnish to the Standby Purchaser and its counsel copies of the Registration
Statement (including all exhibits thereto) proposed to be filed, will provide
the Standby Purchaser and its counsel a reasonable opportunity to review and
comment on such Registration Statement and will not file such Registration
Statement if the Standby Purchaser shall reasonably object thereto within three
calendar days after the receipt thereof.

               (c) Arch will deliver to the Standby Purchaser copies of the
definitive Proxy Statement in the form filed with the SEC and mailed to
Stockholders of Arch and the Registration Statement in the form declared
effective by the SEC.

               (d) Without limiting the generality of the foregoing clause (a)
of this Section 10, Arch will, before filing the Shelf Registration Statement or
any pre-effective amendment thereto, furnish to the Standby Purchaser and its
counsel copies of the Shelf Registration Statement or such pre-effective
amendment thereto, as applicable, proposed to be filed, will provide Standby
Purchaser and its counsel with a reasonable opportunity to review and comment on
the Shelf Registration Statement or such pre-effective amendment thereto, as
applicable, and will not file the Shelf Registration Statement or such
pre-effective amendment thereto, as applicable, to which the Standby Purchaser
or its counsel shall reasonably object within three business days after the
receipt thereof. The Standby Purchaser will furnish to Arch such information
regarding the Standby Purchaser and its plan and method of distribution of the
Registrable Securities as Arch may reasonably request in writing in connection
with the preparation of the Shelf Registration Statement.

               (e) Each of Arch, MobileMedia and the Standby Purchaser will use
its reasonable best efforts to obtain all approvals, waivers, consents and other
authorizations required by the Applicable Requirements, including without
limitation the applicable requirement of the HSR Act, necessary in connection
with the performance of this letter agreement by the Standby Purchaser and the
consummation by the Standby Purchaser of the transactions contemplated hereby.

               (f) Arch will, as requested by the Standby Purchaser, either pay
directly to the appropriate Governmental Entity, or reimburse the Standby
Purchaser for, on behalf of the
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 18


Standby Purchaser, any fees required to be paid by the Standby Purchaser in
connection with its compliance with the applicable requirements of the HSR Act.
In addition, following the Effective Date, Arch will reimburse, promptly upon
written request (accompanied by appropriate supporting documentation), costs and
expenses (including without limitation reasonable fees and expenses of legal
counsel, including a reasonable allocation with respect to the cost of any
internal counsel) not to exceed $100,000, incurred by the Standby Purchaser in
connection with this letter agreement and the transactions contemplated hereby.

        11. Certain Prohibited Transactions. The Standby Purchaser hereby
covenants that, from and after the date hereof, so long as its commitment
hereunder remains in effect, it will not sell, or enter into any agreement
relating to the sale (including without limitation any short sale, equity swap
or other hedge position) of, any shares of Arch capital stock or, except as
otherwise expressly contemplated by this Section 11, engage in any other
disposition of such shares that might negatively affect the market price of such
shares; provided, however, that the foregoing provision will not apply to any
agreement entered into prior to the date hereof (if not entered into in
contemplation of the transactions contemplated by the Plan, the Merger Agreement
or this letter agreement) or any transaction effected pursuant to the terms
thereof. Notwithstanding the immediately preceding sentence, but subject to
Section 3 above and Section 12 below, the Standby Purchaser may at any time, as
it may determine in its sole and absolute discretion, sell or otherwise
transfer, or acquire, or enter into any agreement relating to the sale, transfer
or acquisition of, Rights or Unsecured Claims. The Standby Purchaser
acknowledges that it has received copies of the Rights Agreement and the
amendment thereto attached as Exhibit D to the Merger Agreement (the "Rights
Plan Amendment"). Arch hereby covenants that it will not, without the prior
written consent of the Standby Purchaser, further amend the Rights Agreement in
any manner that would eliminate or reduce the ownership thresholds applicable to
the Standby Purchaser thereunder; provided, however, that this sentence shall
cease to be of any further force or effect at such time after the Effective Date
as the Standby Purchaser ceases to beneficially own in the aggregate at least
10.0% of the outstanding shares of Existing Arch Common Stock.

        12. Voting Agreement. The Standby Purchaser hereby covenants that (a) so
long as the Bankruptcy Court approves the Disclosure Statement not later than
December 31, 1998 and the Confirmation Order is entered not later than March 31,
1999, (i) it will vote, or cause to be voted, for the acceptance of the Plan all
Unsecured Claims held by it on the date fixed for determining holders of
Unsecured Claims entitled to vote for acceptance or rejection of the Plan (the
"Record Date"), (ii) it will not withdraw or otherwise revoke, or cause to be
withdrawn or otherwise revoked, such vote for the acceptance of the Plan, and
(iii) it will not grant, or cause to be granted, to any other person or entity
any proxy to vote with respect to any such Unsecured Claims (other than a proxy
to vote for the acceptance of the Plan) and (b) except with respect to accounts
which cease to be within the Standby Purchaser's control and investment funds
which cease to be under its management, it will not, on or prior to the Record
Date, sell or otherwise transfer any Unsecured Claims held by it unless the
transferee shall have agreed in writing in the
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 19


form attached as Annex III hereto (i) to vote for the acceptance of the Plan
with respect to such Unsecured Claims and (ii) not to sell or otherwise transfer
such Unsecured Claims unless its transferee shall agree to be bound in the same
manner provided in this clause (b) with respect to such Unsecured Claims.

        13. Other Standby Purchase Commitments. (a) Each of Arch and MobileMedia
covenants that it will not agree to any amendment or modification to any of the
letter agreements, dated the date hereof, among Arch, MobileMedia and any of the
Other Standby Purchasers (the "Other Standby Purchase Commitments"), without the
prior written consent of the Standby Purchaser. Notwithstanding the immediately
preceding sentence, Arch and MobileMedia may, without the prior written consent
of the Standby Purchaser, agree to an amendment or modification to any of the
Other Standby Purchase Commitments to the extent that (i) such amendment or
modification has the sole effect of reducing or eliminating the financial
commitment thereunder and (ii) simultaneously therewith, a qualified
institutional buyer (as such term is defined in Rule 144A promulgated under the
Securities Act) reasonably acceptable to the Standby Purchaser makes a
commitment in a corresponding amount on terms identical in all material respects
to those set forth in such Other Standby Purchase Commitment.

               (b) The Standby Purchaser will have no liability for the
commitment of any Other Standby Purchaser under any Other Standby Purchase
Commitments or the commitment of any other person contemplated by Section 13(a)
above.

        14. Certain Notices; Certain Information. (a) Each of Arch and
MobileMedia hereby covenants that it will promptly deliver to the Standby
Purchaser, and the Standby Purchaser hereby covenants that it will promptly
deliver to Arch and MobileMedia, written notice of any matter, event or
development that would (i) render any representation or warranty made by it
herein inaccurate or incomplete in any respect or (ii) constitute or result in a
breach by it of, or a failure by it to comply with, any covenant herein
applicable to it.

               (b) Each of Arch and MobileMedia will furnish the Standby
Purchaser with such information regarding itself as the Standby Purchaser may
reasonably request.

        15. Certain Consent Rights. (a) Notwithstanding anything to the contrary
herein contained, except as expressly contemplated by the Merger Agreement or
the Plan, Arch hereby covenants that it will not take, or agree in writing to
take, any action contemplated by Section 4.5(b)(ii), (iii), (iv), (viii) or (ix)
of the Merger Agreement without the prior written consent of the Standby
Purchaser.

               (b) Arch hereby covenants that, without the prior written consent
of the Standby Purchaser, it will not, prior to the Effective Date, enter into
any agreement with respect to its securities, or amend any existing agreement
with respect to its securities (including without
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 20


limitation the Existing Registration Rights Agreements) in any manner
inconsistent with the rights to be granted to the Standby Purchaser pursuant to
the Registration Rights Agreement.

        16. Board Representation. Arch hereby covenants that: (a) on or prior to
the Effective Date, Arch will cause a vacancy to be created on its Board of
Directors (by increasing the number of members of such Board or otherwise) and
effective no later than the Effective Date will cause one person designated by
the Standby Purchaser (the "Designee"), which person shall be reasonably
acceptable to the Board of Directors of Arch and shall not be a director or
employee of any entity that competes with Arch in the paging industry (excluding
for this purpose the Personal Communications Services business), to be elected
or appointed to such Board with an initial term expiring at Arch's Annual
Meeting of Stockholders to be held in the year 1999; (b) so long as the Standby
Purchaser beneficially owns (as a result of its discretionary control of
accounts, management discretion over investment funds or otherwise, directly or
through its affiliates) capital stock of Arch representing at least (x) with
respect to Arch's Annual Meeting of Stockholders to be held in the year 2002 and
meetings of Arch's stockholders held prior thereto, 5.0% and (y) with respect to
meetings of Arch's stockholders held thereafter 10.0%, of the outstanding voting
power, Arch will (i) nominate and recommend the Designee (or another person
designated by the Standby Purchaser as the Designee's successor) for election at
any meeting of Arch's stockholders at which the term of the Designee or any
successor thereto would otherwise expire and (ii) fill any vacancy on Arch's
Board of Directors created by the death, resignation or removal of the Designee
or any successor thereto with another person designated by the Standby Purchaser
as the Designee's successor; and (c) so long as the Designee or any successor
thereto remains on Arch's Board of Directors, Arch will permit one additional
person designated by the Standby Purchaser (the "Observer") to attend all
meetings of such Board as an observer and to receive copies of all documents and
other materials made available to the members of such Board. The Standby
Purchaser hereby acknowledges that the Designee and the Observer will be
required to execute and deliver to Arch confidentiality agreements in the form
executed by the existing members of Arch's Board of Directors. The commitment of
the Standby Purchaser hereunder is subject to the additional condition that Arch
shall have performed its covenant set forth in clause (a) of the first sentence
of this Section 16.

        17. Removal of Legends. In the event that, following the transactions
contemplated by the Merger Agreement, the Plan and this letter agreement, any
certificates evidencing securities ("Certificates") of Arch held by the Standby
Purchaser bear a restrictive legend then:

               (a) if the Standby Purchaser delivers to Arch (i) a certificate,
        in a form reasonably satisfactory to Arch, certifying that securities
        evidenced by such Certificate have been transferred pursuant to a
        registration statement that is effective under the Securities Act or
        (ii) a certificate, in a form reasonably satisfactory to Arch,
        certifying that securities evidenced by such Certificate have been
        transferred without registration in accordance with the requirements of
        Rule 144 under the Securities Act, Arch will, or will
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 21


        instruct its transfer agent to, issue upon surrender of such Certificate
        one or more new Certificates evidencing the securities so transferred
        evidenced by the Certificate so surrendered, which new Certificate or
        Certificates will not bear any such legend; and

               (b) if the Standby Purchaser delivers to Arch an opinion of
        counsel to the Standby Purchaser (which may be internal counsel to the
        Standby Purchaser) that, in the opinion of such counsel, such legend is
        not, or is no longer, required to ensure compliance with the Securities
        Act, Arch will, or will instruct its transfer agent to, issue upon
        surrender of such Certificate one or more new Certificates evidencing
        the securities evidenced by the Certificate so surrendered, which new
        Certificate or Certificates will not bear any such legend.

                                   *     *     *     *     *

        If you are in agreement with the foregoing, please execute the enclosed
copy of this letter agreement as indicated and return it to the undersigned.
This letter agreement will become effective upon (i) the delivery to us of
executed counterparts of this letter agreement by each of you and (ii) the
execution and delivery of each of the Other Standby Purchase Commitments by each
of the parties thereto. Once effective, this letter agreement will terminate on
(i) the date on which the Debtor Tower Agreement is terminated, unless prior to
or simultaneously with such termination, MobileMedia shall have entered into a
definitive agreement (which shall be comparable in form and substance to the
Debtor Tower Agreement and a copy of which shall be delivered to the Standby
Purchaser promptly following the execution thereof) with a bona fide third-party
purchaser providing for a sale to such third party of the assets or
substantially all of the assets to be sold to Pinnacle pursuant to the Debtor
Tower Agreement resulting in net proceeds to MobileMedia of not less than $165.0
million (an "Acceptable Sale"), (ii) December 31, 1998, unless the Closing (as
defined in the Debtor Tower Agreement) or the closing of an Acceptable Sale
shall have occurred on or before such date, (iii) March 31, 1999, unless the
Confirmation Order shall have been entered by the Bankruptcy Court on or before
such date, (iv) June 30, 1999, unless the effectiveness of the Plan occurs on or
before such date, or (v) if not theretofore terminated pursuant to one of the
foregoing clauses, the date on which the Merger Agreement is terminated in
accordance with the terms thereof.

        All notices and other communications hereunder must be in writing. Any
notice or other communication hereunder will be deemed duly delivered three
business days after it is sent by registered or certified mail, return receipt
requested, postage prepaid, or two business days after it is sent via a
reputable international overnight courier service, in each case to the intended
recipient at the address therefor set forth on the signature page hereto. Any
party hereto may give any notice or other communication hereunder by personal
delivery or telecopy, but no such notice or other communication will be deemed
to have been duly given unless and until it actually is received by the party
for whom it is intended. Any party may change the address to which
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 22


notices and other communications hereunder are to be delivered by giving the
other parties notice in the manner herein set forth.

        This letter agreement represents the final agreement among the parties
hereto with respect to the subject matter hereof and may not be contradicted by
evidence of prior or contemporaneous agreements of the parties. There are no
unwritten oral agreements between the parties relating to the subject matter
hereof. This letter agreement may not be amended or modified except by a written
instrument signed by each of the Standby Purchaser, Arch and MobileMedia.

        This letter agreement shall be governed by and construed in accordance
with the laws of the State of Delaware without regard to its principles of
conflicts of law.

        This letter agreement may be executed in counterparts which, taken
together, shall constitute one and the same instrument.

                           Very truly yours,

                           W.R. Huff Asset Management Co., L.L.C.


                           By:
                              -------------------------------------
                              Name: Bryan E. Bloom, Esq.
                              Its:  Attorney-in-Fact

                           Address: 67 Park Place, 9th Floor
                                    Morristown, New Jersey 07960
                                    Attn:  Cathy Markey, Esq.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 23


ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.

By:
   -------------------------------
Name:
     -----------------------------
Its:
    ------------------------------

Address:  1800 West Park Drive, Suite 250
          Westborough, MA  01581
          Attn:  Chairman and Chief
                  Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA  02109
               Attn:  Jay E. Bothwick


Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.


By:
   -------------------------------
Name:
     -----------------------------
Its:
    ------------------------------

Address:   Fort Lee Executive Park
           One Executive Drive, Suite 500
           Fort Lee, NJ  07024
           Attn:  Chairman - Restructuring

With copy to:  Sidley & Austin
               875 Third Avenue, Suite 1400
               New York, New York 10022
               Attn:  James D. Johnson
<PAGE>

                                                                         ANNEX I
                                                                         -------


                               COMMITMENT AMOUNTS
                              (dollars in millions)

<TABLE>
<CAPTION>
                                                  Column A           Column B           Column C       Column D
                                                  --------           --------           --------       --------

                                              Rights Exercise   Unexercised Rights       Total
                                                 Commitment         Commitment        Commitment      Commitment
Name and Address of Standby Purchasers           Amount (1)         Amount (2)           Amount       Percentage
- --------------------------------------           ----------         ----------           ------       ----------
<S>                                                 <C>                <C>              <C>              <C>   
W.R. Huff Asset Management Co., L.L.C., as          $39.27             $35.80           $75.07           34.60%
   agent for its affiliates and discretionary                                        
   accounts                                                                          
67 Park Place, 9th Floor                                                             
Morristown, New Jersey  07960                                                        
Stated Principal Amount of 9 3/8% Notes:                                             
$   57,847,000                                                                      
Stated Principal Amount of 10 1/2% Notes:                                            
$   27,970,000                                                                      
                                                                                     
The Northwestern Mutual Life Insurance              $10.95              $9.97           $20.92            9.64%
   Company*                                                                          
720 East Wisconsin Avenue                                                            
Milwaukee, Wisconsin  53202                                                          
Stated Principal Amount of 9 3/8% Notes:                                             
$   19,776,000                                                                        
Stated Principal Amount of 10 1/2% Notes:                                            
$   3,350,000                                                                       
                                                                                     
The Northwestern Mutual Life Insurance               $2.65              $2.42            $5.07            2.34%
   Company for its Group Annuity Separate                                            
   Account*                                                                          
720 East Wisconsin Avenue                                                            
Milwaukee, Wisconsin  53202                                                          
Stated Principal Amount of 9 3/8% Notes:                                             
$     -0-                                                                        
Stated Principal Amount of 10 1/2% Notes                                             
$   7,000,000                                                                        
                                                                                     
Northwestern Mutual Series Fund, Inc. for the         $.75               $.69            $1.44            0.66%
   High Yield Bond Portfolio*                                                        
720 East Wisconsin Avenue                                                            
Milwaukee, Wisconsin  53202                                                          
Stated Principal Amount of 9 3/8% Notes:                                             
$     -0-                                                                       
Stated Principal Amount of 10 1/2% Notes:                                            
$   2,000,000                                                                    
</TABLE>

- --------
* The Northwestern Mutual Life Insurance Company, The Northwestern Mutual Life
Insurance Company for its Group Annuity Separate Account and Northwestern Mutual
Series Fund, Inc. for the High Yield Bond Portfolio are affiliated entities for
purposes of clauses (a) and (k) of Section 5 and clause (iii) of Section 6.
<PAGE>

                               COMMITMENT AMOUNTS
                              (dollars in millions)

<TABLE>
<CAPTION>
                                                          Column A               Column B           Column C       Column D
                                                          --------               --------           --------       --------
                                                                            
                                                      Rights Exercise       Unexercised Rights       Total
                                                         Commitment             Commitment        Commitment      Commitment
Name and Address of Standby Purchasers                   Amount (1)             Amount (2)           Amount       Percentage
- --------------------------------------                   ----------             ----------           ------       ----------
<S>                                                        <C>                   <C>                 <C>            <C>   
Credit Suisse First Boston Corporation                     $29.48                $26.88              $56.36         25.97%
11 Madison Avenue, 4th Floor                                                                     
New York, New York 10010                                                                         
Stated Principal Amount of 9 3/8% Notes:                                                         
$  32,453,000                                                                                   
Stated Principal Amount of 10 1/2% Notes:                                                        
$  35,930,000                                                                                   
                                                                                                 
Whippoorwill Associates, Inc., as general partner          $30.42                $27.72              $58.14         26.79%
   and/or agent for the parties set forth on                                                     
   Schedule A hereto in the percentages noted                                                    
   thereon                                                                                       
11 Martine Avenue                                                                                
White Plains, New York 10606                                                                     
Stated Principal Amount of 9 3/8% Notes:                                                         
$  37,855,000                                                                                   
Stated Principal Amount of 10 1/2% Notes:                                                        
$  31,410,000                                                                                   
                                       Total:             $113.52               $103.48             $217.00        100.00%
                                                          -------               -------             -------        
</TABLE>
                                                                              
(1)   The "Rights Exercise Commitment Amount", for each Standby Purchaser, shall
      mean an amount equal to the product of (i) the Rights Subscription Price
      (as defined in Schedule II to the Merger Agreement) and (ii) the number of
      Rights issuable in respect of an amount of Allowed Unsecured Claims
      derived from the principal amount of 9 3/8% Notes and the 10 1/2% Notes
      indicated under the Standby Purchaser's name on this Annex I held by such
      Standby Purchaser on the date hereof. The dollar amounts set forth under
      Column A are estimates provided for illustrative purposes only, based on
      the assumptions that (x) there is a total of $475 million of Allowed
      Unsecured Claims, (y) there is no Rights Reserve (as defined in the Plan),
      and (z) the aggregate amount of Subordinated Noteholder Claims (as defined
      in the Plan) is $441,819,762.

(2)  The "Unexercised Rights Commitment Amount", for each Standby Purchaser,
     shall mean an amount equal to (i) the Total Commitment Amount indicated in
     Column C for such Standby Purchaser less (ii) the Rights Exercise
     Commitment Amount for such Standby Purchaser. The dollar amounts set forth
     under Column B are estimates provided for illustrative purposes only, based
     on the estimates set forth in Column A.
<PAGE>

                                                                        ANNEX II
                                                                        --------

                                   UNDERTAKING

               The Committee hereby undertakes to distribute to the Standby
Purchaser (until instructed by the Standby Purchaser to do otherwise) copies of
any and all notices, documents or information to be provided by or made
available by the Debtors to Arch pursuant to the Merger Agreement or provided by
or made available by Arch to the Debtors pursuant to the Merger Agreement that
are received by the Committee pursuant to the Debtor/Committee Agreement as soon
as practicable with its receipt thereof. The Committee hereby further undertakes
to consult with the Standby Purchaser (until instructed by the Standby Purchaser
to do otherwise) prior to delivering any written consent or exercising any other
right of the Committee (other than the distribution of notices, documents or
information to the Standby Purchaser or the Other Standby Purchasers) pursuant
to the Debtor/Committee Agreement or the Plan. The Committee will not enter into
any amendment to the Debtor/Committee Agreement without the prior written
consent of the Standby Purchaser.

                                            THE OFFICIAL COMMITTEE
                                            OF UNSECURED CREDITORS


                                            By:
                                               ---------------------------------
                                            Its:
                                               ---------------------------------
<PAGE>

                                                                       ANNEX III

                                VOTING AGREEMENT

The undersigned transferee of indebtedness of MobileMedia Corporation or one of
its direct or indirect subsidiaries (collectively, "MobileMedia") described in
Schedule A attached hereto (the "Claim"), hereby acknowledges and agrees as
follows:

        1.     MobileMedia is a debtor-in-possession under Chapter 11 of the
               Bankruptcy Code and has proposed a First Amended Joint Plan of
               Reorganization dated August __, 1998 (the "Amended Plan").

        2.     By acquiring the Claim the undersigned may also acquire rights to
               vote on the adoption of the Amended Plan.

        3.     As a condition of the transfer of the Claim, the undersigned
               hereby agrees to exercise all voting rights it may have as holder
               of the Claim in favor of the Amended Plan unless the Amended Plan
               shall have been withdrawn.

        4.     The undersigned agrees that it shall not subsequently transfer
               the Claim or any portion thereof unless and until it obtains from
               its transferee a Voting Agreement identical to the form hereof.

        IN WITNESS HEREOF, the undersigned transferee has executed this Voting
Agreement this _____ day of __________, 199_.

                                                   [TRANSFEREE]


                                                   By:
                                                      --------------------------
                                                      Title:


Accepted By:


- -------------------------
[Transferor]
<PAGE>

                                   SCHEDULE A
                                       TO
                                VOTING AGREEMENT

[Describe Claim.]
<PAGE>

                                                               SCHEDULE 9(a)(xi)
                                                               -----------------

Existing Registration Rights Agreement

(1)   Registration Rights Agreement, dated as of June 24, 1998, by and among
      Arch Communications Group, Inc., Sandler Capital Partner, IV, L.P.,
      Sandler Capital Partners IV FTE, L.P. Harvey Sandler, John Kornreich,
      Michael J. Morocco, Andrew Sandler, South Fork Partners, The Georgica
      International Fund Limited, Aspen Partners and Consolidated Press
      International Limited, as amended

(2)   Registration Rights Agreement, dated as of June 29, 1998, Arch
      Communications Group, Inc. Adelphia Communications Corporation and
      Lisa-Gaye Shearing

Inconsistencies:

The provisions of the Registration Rights Agreement listed at (2) above are
inconsistent in certain respects with the provisions of the Registration Rights
Agreement.
<PAGE>

                                                                       Exhibit K
                                                                       ---------


                        WHIPPOORWILL ASSOCIATES, INC.
                              11 Martine Avenue
                         White Plains, New York 10606

                                August 18, 1998


Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts  01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey  07024

            Re:   Commitment to Purchase Stock and Warrants
                  -----------------------------------------

Gentlemen:

      Arch Communications Group, Inc., a Delaware corporation ("Arch"), and
MobileMedia Communications, Inc., a Delaware corporation ("MobileMedia"), intend
to engage in a business combination transaction (the "Combination") as part of a
reorganization (the "Reorganization") of MobileMedia, MobileMedia Corporation,
the sole stockholder of MobileMedia ("Parent"), and all of MobileMedia's
subsidiaries (collectively, the "Debtors") pursuant to chapter 11 of title 11,
United States Code, 11 U.S.C. ss.ss. 101 et seq. (the "Bankruptcy Code"). It is
our understanding that in connection with the Reorganization, among other
things: (a) pursuant to the Agreement and Plan of Merger, dated as of the date
hereof (the "Merger Agreement"), among Arch, a wholly owned subsidiary of Arch
("Merger Sub"), Parent and MobileMedia, MobileMedia will merge with and into
Merger Sub, with Merger Sub continuing as the surviving corporation and a wholly
owned subsidiary of Arch; (b) pursuant to the Merger Agreement, Arch will make
available for distribution pursuant to a plan of reorganization of the Debtors
in the form attached as Exhibit A to the Merger Agreement, with such amendments
and modifications thereto as are made in a manner consistent with clause (e) of
Section 5 hereto (such plan of reorganization being referred to herein as the
"Plan"), (i) cash, (ii) shares of its Common Stock, par value $.01 per share
("Existing Arch Common Stock"), and (iii) warrants entitling the holders thereof
to purchase shares of Existing Arch Common Stock ("Arch Warrants"), with such
Arch Warrants to be issued pursuant to, and to have the terms set forth in, a
warrant agreement in the form attached as Exhibit B to the Merger Agreement (the
"Arch Warrant Agreement"); (c) holders of unsecured non-priority claims against
the Debtors ("Unsecured Claims"), to the extent such Unsecured Claims are
Allowed (as defined in the Plan), will receive pursuant to the Plan (i) shares
of Existing 
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2


Arch Common Stock and (ii) rights to purchase ("Rights") for cash units
consisting of (A) shares of Existing Arch Common Stock and (B) Arch Warrants;
(d) holders of claims arising under or relating to the Credit Agreement, dated
December 4, 1995, as amended, among MobileMedia and the other parties thereto
("Secured Claims"), to the extent such Secured Claims are Allowed, will receive
pursuant to the Plan cash in an amount equal to 100% of such claims; (e) all of
the outstanding equity interests in MobileMedia and Parent will be canceled
without consideration and Parent will be dissolved; and (f) the commitments
under the DIP Loan Agreement will terminate and all amounts owed under or in
respect of the DIP Loan Agreement will be paid in full in cash.

      Terms used herein with initial capital letters that are not otherwise
defined shall have the meanings ascribed to such terms in the Merger Agreement.

      1. The Commitment. In connection with the foregoing, Whippoorwill
Associates, Inc. ("Whippoorwill"), as agent for each account, fund or entity
listed in Schedule A to Annex I hereto (each, a "Whippoorwill Account" and
collectively, the "Standby Purchaser"), hereby advises you of the Standby
Purchaser's commitment (the "Commitment"), subject to the conditions set forth
herein:

            (a) to exercise any Rights distributed to it in respect of its
      Allowed Unsecured Claims in accordance with the Plan and not thereafter
      sold or transferred as permitted by Section 3 below to purchase units
      consisting of shares of Existing Arch Common Stock and Arch Warrants
      underlying such Rights, to the extent that the aggregate purchase price
      payable upon such exercise, as determined in accordance with Schedule II
      to the Merger Agreement (the "Subscription Price"), does not exceed the
      Rights Exercise Commitment Amount of the Standby Purchaser as set forth in
      Annex I hereto;

            (b) if (i) the Standby Purchaser sells or otherwise transfers any or
      all of (A) the Rights distributed to it in accordance with the Plan or (B)
      Unsecured Claims held by it as of the date hereof in respect of which
      Rights are to be distributed, in each case as permitted by Section 3
      below, and (ii) the Rights sold or transferred by the Standby Purchaser or
      the Rights distributed in respect of Unsecured Claims held by it as of the
      date hereof that are hereafter sold or transferred by the Standby
      Purchaser are not exercised prior to the expiration thereof (at which time
      such Rights will be void and will no longer be exercisable), to purchase
      for cash (based upon the Subscription Price payable upon exercise of such
      Rights) identical units consisting of shares of Existing Arch Common Stock
      and Arch Warrants underlying such unexercised Rights, to the extent that
      the aggregate purchase price therefor, together with the aggregate
      Subscription Price payable upon exercise of Rights exercised as
      contemplated by clause (a) above, does not exceed 
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3


      the Rights Exercise Commitment Amount of the Standby Purchaser as
      set forth in Annex I hereto; and

            (c) if any Rights distributed in accordance with the Plan (other
      than (i) Rights distributed to the Standby Purchaser or the other holders
      of Unsecured Claims listed on Annex I hereto (the "Other Standby
      Purchasers") and retained by them (which Rights are referred to in Section
      1(a) above and Section 1(a) of each of the Other Standby Purchase
      Commitments (as defined in Section 13(a) below)) or (ii) subject to
      Section 3(b) below, Rights distributed in respect of Unsecured Claims held
      by the Standby Purchaser or the Other Standby Purchasers as of the date
      hereof that are hereafter sold or transferred by them (which Rights are
      referred to in Sections 1(b) and 3 hereof and Sections 1(b) and 3 of each
      of the Other Standby Purchase Commitments)) remain unexercised upon the
      expiration thereof (at which time such Rights will be void and will no
      longer be exercisable), to purchase for cash (based on the Subscription
      Price payable upon exercise of such Rights) pro rata in accordance with
      and up to the Unexercised Rights Commitment Amount of the Standby
      Purchaser as set forth in Annex I hereto identical units consisting of
      shares of Existing Arch Common Stock and Arch Warrants underlying such
      unexercised Rights.

      2. Arch Class B Common Stock. (a) Notwithstanding anything to the contrary
herein contained, if the purchases by the Standby Purchaser contemplated by
Section 1 above would cause the Standby Purchaser, the Other Standby Purchasers,
and any other persons or entities who, when taken together with any one or more
of the Standby Purchaser and the Other Standby Purchasers, would constitute a
"person" or "group" as used in Section 13(d) or Section 14(d) of the Exchange
Act or Rule 13d-3 or Rule 13d-5 promulgated thereunder, or any "affiliate" as
defined in Rule 405 promulgated under the Securities Act of any of them
(collectively, the "Standby Class B Holders"), in the aggregate, to beneficially
own on the effective date of the Plan (the "Effective Date") shares representing
more than 49.0% of the capital stock of Arch generally entitled to vote in the
election of directors or more than 49.0% of the total voting power of the
capital stock of Arch, Arch will substitute shares of Class B Common Stock, par
value $.01 per share, of Arch ("Arch Class B Common Stock"), with such Arch
Class B Common Stock having the terms set forth in the form of Certificate of
Amendment to Certificate of Incorporation of Arch attached as Exhibit F to the
Merger Agreement (the "Arch Charter Amendment"), for shares of Existing Arch
Common Stock included in the units so purchased on a one-for-one basis such that
on the Effective Date the Standby Class B Holders, in the aggregate, will
beneficially own shares representing not more than 49.0% of the capital stock of
Arch generally entitled to vote in the election of directors and not more than
49.0% of the total voting power of the capital stock of Arch, all as provided in
the Plan. For purposes of this letter agreement, "beneficial ownership" shall be
determined as provided in Rule 13d-3 and Rule 13d-5 promulgated under the 
Exchange 
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4


Act, except that a person or entity shall be deemed to have "beneficial
ownership" of all securities that such person or entity has the right to
acquire, whether such right is exercisable immediately or only after the passage
of time.

            (b) For purposes of calculating the percentages referred to in
Section 2(a) above, it will be assumed that no additional Unsecured Claims are
allowed after the Effective Date and all of the shares of Existing Arch Common
Stock in the Creditor Stock Pool (as defined in the Plan) are distributed in
accordance with the Plan to the holders of Allowed Unsecured Claims as of the
Effective Date.

            (c) Substitution of shares of Class B Common Stock as contemplated
by Section 2(a) above will be effectuated as follows:

                  (i) first, to the extent that the Standby Purchaser or any
            Other Standby Purchaser beneficially owns shares of Existing Arch
            Common Stock as of the Effective Date, other than those acquired as
            contemplated by the Plan, the Merger Agreement, this letter
            agreement and the Other Standby Purchase Commitments ("Non-Plan Arch
            Shares"), among the Standby Purchaser and such Other Standby
            Purchaser pro rata based on ownership of Non-Plan Arch Shares up to
            an amount equal to the aggregate number of Non-Plan Arch Shares
            beneficially owned by them as of the Effective Date; and

                  (ii) second, if necessary, among the Standby Purchaser and the
            Other Standby Purchasers in accordance with the percentages set
            forth in Column D of Annex I hereto.

            (d) The Standby Purchaser hereby disclaims beneficial ownership of
any securities of Arch owned by the Other Standby Purchasers.

      3. Certain Transfer Restrictions. (a) Subject to Section 12 below, the
Standby Purchaser may (i) sell or otherwise transfer any or all of (A) the
Rights distributed to it in accordance with the Plan or (B) Unsecured Claims in
respect of which Rights are to be distributed or (ii) purchase or otherwise
acquire (A) Rights distributed to others in accordance with the Plan or (B)
Unsecured Claims in respect of which Rights are to be distributed; provided,
however, that, with respect to clause (i) of this sentence, (X)
contemporaneously with the consummation of any such sale or other transfer of
Rights or Unsecured Claims, the Standby Purchaser will notify Arch and
MobileMedia of the occurrence thereof and (Y) the Standby Purchaser will not
consummate any such sale or other transfer unless the transferee or transferees
of such Rights or Unsecured Claims shall have entered into a written agreement
(a "Tracking Agreement") (I) to
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5


notify the Standby Purchaser, Arch and MobileMedia of any subsequent transfer by
it of such Rights or Unsecured Claims or any Rights distributed to it in respect
of such Unsecured Claims and (II) not to sell or otherwise transfer such Rights
or Unsecured Claims or Rights distributed to it in respect of such Unsecured
Claims, unless its transferee or transferees shall agree in writing to be bound
in the same manner provided in this clause (Y) with respect to any subsequent
transfer by it.

      (b) Notwithstanding the provisions of clause (Y) of the proviso in Section
3(a) above, the Standby Purchaser may elect to sell or otherwise transfer (i)
any or all of the Rights distributed to it in accordance with the Plan or (ii)
Unsecured Claims in respect of which Rights are to be so distributed, in either
case without entering into a Tracking Agreement with its transferee or
transferees (any Rights so transferred and any Rights distributed in respect of
Allowed Claims so transferred, together with any Rights so transferred and any
Rights distributed in respect of Allowed Claims so transferred by the Other
Standby Purchasers pursuant to Section 3(b) of the Other Standby Purchase
Commitments, being referred to herein collectively as "Untracked Rights"). Any
Rights that remain unexercised upon expiration thereof will be deemed to be
"Section 3(b) Rights" up to, but not exceeding, the amount of Untracked Rights.
The Section 3(b) Rights shall be exercised as follows prior to the application
of Section 1(c) above and Section 1(c) of the Other Standby Purchase
Commitments: (A) the Standby Purchaser and the Other Standby Purchasers will
first be given the opportunity to purchase for cash (based on the Subscription
Price payable upon exercise of such Rights) units consisting of shares of Arch
Common Stock and Arch Warrants underlying a number of unexercised Rights up to
the amount of Section 3(b) Rights in accordance with the percentages set forth
in Column D of Annex I hereto and (B) to the extent such units are not so
purchased, the Standby Purchaser and any Other Standby Purchasers that are
responsible for the existence of the Section 3(b) Rights will be required to
purchase such units pro rata based on the number of Section 3(b) Rights
resulting from their respective transfers. Nothing in this Section 3(b) will in
any way reduce the commitment of the Standby Purchaser specified in Section 1(c)
above or the Unexercised Rights Commitment Amount as set forth in Annex I
hereto.

      4. The Closing. (a) Notwithstanding anything to the contrary herein
contained or the terms of the Rights or the Plan, subject to the conditions set
forth herein, on the Effective Date the Standby Purchaser, in satisfaction of
the Commitment, will deliver at the Closing (i) the aggregate Subscription Price
payable upon exercise of any Rights exercised by it and (ii) the purchase price
payable in consideration of any shares of Existing Arch Common Stock or, if
applicable, Arch Class B Common Stock and Arch Warrants to be otherwise
purchased by it pursuant to the Commitment; provided, however, that, if
requested by the Standby Purchaser in writing at least two business days prior
to the Effective Date, any cash to be distributed to the Standby Purchaser in
respect of Allowed Secured Claims pursuant to the Plan will, prior to the
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6


distribution thereof pursuant to the Plan and in accordance with the instruction
included in such written request, be first applied, on behalf of the Standby
Purchaser, to the payment of such amounts payable on the Effective Date as
provided in this Section 4(a).

            (b) Upon payment of the amounts payable as provided in Section 4(a),
on the Effective Date at the Closing Arch will deliver to the Standby Purchaser
(or its designees) certificates representing the shares of Existing Arch Common
Stock, shares of Arch Class B Common Stock, if applicable, and the Arch
Warrants, in each case, (i) issuable upon exercise of any Rights exercised by
the Standby Purchaser or (ii) otherwise purchased by the Standby Purchaser
pursuant to the Commitment.

            (c) Arch will deliver to the Standby Purchaser at least five
business days prior to the Effective Date a written notice which shall (i)
specify the amounts payable at the Closing by it in satisfaction of the
Commitment, (ii) specify the date on which the Effective Date is to occur and
the last date on which the notice referred to in Section 4(d) may to be
delivered, and (iii) indicate the matters required to be addressed in such
notice.

            (d) At least two business days prior to the Effective Date, the
Standby Purchaser will deliver to Arch and MobileMedia a written notice which
shall set forth the number of shares of Existing Arch Common Stock beneficially
owned by it as of such date. During the period from the date of such notice
through the Effective Date, neither the Standby Purchaser nor any affiliate
thereof shall acquire beneficial ownership of, or any rights to acquire, any
additional shares of Existing Arch Common Stock or any Unsecured Claim.

      5. Certain Conditions. The Commitment is subject to the conditions that:

            (a) (i) the Confirmation Order (as defined in the Plan), in a form
      reasonably satisfactory to the Standby Purchaser, shall have been entered
      by the Bankruptcy Court (as defined in the Plan) and (ii) such
      Confirmation Order shall have become a Final Order (as defined in Section
      5.1(h) of the Merger Agreement); provided, however, that (A) the Standby
      Purchaser may not assert the condition contained in clause (ii) above if
      each of the Other Standby Purchasers that is not affiliated with the
      Standby Purchaser (each, an "Unaffiliated Standby Purchaser"), acting in
      good faith, shall have waived the condition contained in Section 5(a) of
      the Other Standby Purchase Commitments to which such Unaffiliated Standby
      Purchaser is a party and (B) the Standby Purchaser may not assert the
      condition contained in either clause (i) or clause (ii) above if the sole
      reason for the failure of such condition to be satisfied is the failure or
      the threatened failure of the Standby Purchaser or any of its affiliates
      to fulfill the Commitment;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7


            (b) the satisfaction or, with the written consent of the Standby
      Purchaser, waiver of all conditions precedent to the obligations of each
      of the parties to the Merger Agreement contained in the Merger Agreement
      and all conditions precedent to the effectiveness of the Plan contained in
      the Plan; provided, however, that (i) the conditions contained in Section
      5.1(e) and (h), Section 5.2(a), (b), (c), (d) and (e) and Section 5.3(a),
      (b), (c) and (e) of the Merger Agreement (collectively, the "Unilateral
      Conditions") may be waived without the written consent of the Standby
      Purchaser and (ii) the Standby Purchaser may not assert the condition
      contained in this clause (b) if the sole reason for the failure of such
      condition to be satisfied is the failure or the threatened failure of the
      Standby Purchaser or any of its affiliates to fulfill the Commitment;

            (c) there shall be effective under the Securities Act, a
      registration statement (the "Shelf Registration Statement") covering the
      resale by the Standby Purchaser of (i) all shares of Existing Arch Common
      Stock, all shares of Arch Class B Common Stock, if applicable, and all
      Arch Warrants received by the Standby Purchaser as a result of the
      transactions contemplated by the Plan (including those received upon the
      exercise of Rights and pursuant to this letter agreement) and (ii) all
      shares of Existing Arch Common Stock issuable upon conversion of any such
      shares of the Arch Class B Common Stock or exercise of any such Arch
      Warrants (the securities referred to in the foregoing clauses (i) and (ii)
      are referred to herein as the "Registrable Securities");

            (d) Arch shall have executed and delivered to the Standby Purchaser
      a registration rights agreement in the form attached as Exhibit C to the
      Merger Agreement (the "Registration Rights Agreement") granting the
      Standby Purchaser certain demand and piggyback registration rights with
      respect to the Registrable Securities;

            (e) any and all amendments or modifications to the Merger Agreement
      or any exhibit or schedule thereto (including without limitation the Plan,
      the Arch Charter Amendment, the Arch Warrant Agreement and the
      Registration Rights Agreement) on or after the date hereof and any
      consents or waivers delivered on or after the date hereof by Arch or
      MobileMedia to the other under the Merger Agreement (other than (i)
      subject to Section 15(a) below, consents under Section 4.5 of the Merger
      Agreement or (ii) waivers of Unilateral Conditions) shall have been in
      form and substance reasonably satisfactory to the Standby Purchaser;

            (f) the representations and warranties of Arch contained in this
      letter agreement shall be true and correct, in all material respects
      (except for the representations and warranties set forth at clauses (a)(v)
      and (a)(vi) of Section 9 below, which shall be true and correct in all
      respects, and except for the representations and warranties set forth
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8


      at clauses (a)(vii) and (a)(viii) of Section 9 below, which shall be
      disregarded for purposes of this clause (f) insofar as they relate to
      financial projections), on the Effective Date, with the same effect as
      though such representations and warranties were made on the Effective
      Date, and Arch shall have performed or complied with, in all material
      respects, its covenants required to be performed or complied with under
      this letter agreement on or prior to the Effective Date (and Arch shall
      have delivered to the Standby Purchaser a certificate to the effect that
      each of the conditions specified in this clause (f) is satisfied in all
      respects);

            (g) the representations and warranties of MobileMedia contained in
      this letter agreement shall be true and correct, in all material respects
      (except for the representations and warranties set forth at clauses (b)(v)
      and (b)(vi) of Section 9 below, which shall be true and correct in all
      respects, and except for the representations and warranties set forth at
      clauses (b)(vii) and (b)(viii) of Section 9 below, which shall be
      disregarded for purposes of this clause (f) insofar as they relate to
      financial projections), on the Effective Date, with the same effect as
      though such representations and warranties were made on the Effective
      Date, and MobileMedia shall have performed or complied with, in all
      material respects, its covenants required to be performed or complied
      with, under this letter agreement on or prior to the Effective Date (and
      MobileMedia shall have delivered to the Standby Purchaser a certificate to
      the effect that each of the conditions specified in this clause (g) is
      satisfied in all respects);

            (h) simultaneously with the transactions contemplated by Section 4
      above, Arch shall have performed its obligation under clause (e) of
      Section 1.3 of the Merger Agreement and any debt financing (other than
      secured bank financing) obtained by Arch to enable it to do so shall have
      terms no less favorable to Arch than those set forth in the Bridge
      Commitment Letter (the "Bridge Commitment Letter"); provided, however,
      that the Standby Purchaser may not assert the condition contained in this
      clause (h) if the sole reason for the failure of such condition to be
      satisfied is the failure or threatened failure of the Standby Purchaser or
      any of its affiliates to fulfill the Commitment;

            (i) simultaneously with the transactions contemplated by Section 4
      above, each of the Other Standby Purchasers shall have fulfilled its
      commitment under the Other Standby Purchase Commitment to which it is a
      party, and, if applicable, any other person having a commitment
      contemplated by Section 13(a) hereof shall have fulfilled such commitment;

            (j) (i) the shares of Existing Arch Common Stock to be issued and
      distributed as contemplated by Section 1.3(e) and Section 1.6 of the
      Merger Agreement shall be so
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9


      issued and distributed pursuant to an exemption from registration under
      the Securities Act provided by Section 1145 of the Bankruptcy Code, and
      (ii) (A) the issuance of the Rights, (B) the issuance of the shares of
      Existing Arch Common Stock, the shares of Arch Class B Common Stock, if
      applicable, and the Arch Warrants upon exercise of the Rights, (C) the
      issuance to the Standby Purchaser of the shares of Existing Arch Common
      Stock, the shares of Arch Class B Common Stock, if applicable, and the
      Arch Warrants otherwise as contemplated by Section 1 and Section 3 above
      and the Arch Warrants contemplated by Section 7 below, and (D) the
      issuance of Existing Arch Common Stock upon exercise of the Arch Warrants
      or conversion of Arch Class B Common Stock, if applicable, shall be
      covered by the Registration Statement, the Registration Statement shall
      have been declared effective and no stop order with respect thereto shall
      be in effect;

            (k) (i) the FCC Grant shall have been issued by the FCC and (ii)
      such FCC Grant shall have become a Final Order (as defined in Section
      5.1(e) of the Merger Agreement); provided, however, that (A) the Standby
      Purchaser may not assert the condition contained in clause (ii) above if
      each of the Unaffiliated Standby Purchasers, acting in good faith, shall
      have waived the condition contained in Section 5(k) of the Other Standby
      Purchase Commitment to which such Unaffiliated Standby Purchaser is a
      party or (B) the Standby Purchaser may not assert the condition contained
      in either clause (i) or clause (ii) above if the sole reason for the
      failure of such condition to be satisfied is an appeal, a motion for
      reconsideration or similar action taken by any present or former officer
      of any Debtor considered or determined by the FCC to be an alleged or
      actual wrongdoer for purposes of the FCC Proceeding;

            (l) any applicable waiting period under the HSR Act shall have
      expired or been terminated early; and

            (m) Arch shall have filed with the SEC no later than Friday, August
      21, 1998 a preliminary Proxy Statement which shall not include any
      information that a reasonable investor would consider important in
      determining whether to make an investment decision regarding a purchase of
      Existing Arch Common Stock and would view its disclosure as significantly
      altering the total mix of information otherwise contained therein, which
      information is not included in the Draft Proxy Statement; provided,
      however, that the Standby Purchaser may not assert the condition in this
      clause (m) unless (i) the information with respect to which the Standby
      Purchaser seeks to assert such condition relates to information other than
      the descriptions of the Merger, the Plan and the other exhibits thereto
      contained in the preliminary Proxy Statement and (ii) such condition is
      asserted by the Standby Purchaser not later than two business days after
      Arch delivers to the Standby Purchaser a copy of the preliminary Proxy
      Statement as filed with the SEC
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10


      indicating the changes therein from the Draft Proxy Statement (which copy
      Arch will deliver as promptly as practicable following filing the same
      with the SEC).

The Standby Purchaser hereby acknowledges and agrees that (i) the entities with
an asterisk next to their names on Annex I hereto (the "Affiliated Standby
Purchasers") shall be deemed to be affiliated with each other for purposes of
clauses (a) and (k) above and clause (iii) of Section 6 below, and (ii) the
Affiliated Standby Purchasers will act jointly with respect to any decision to
waive the condition contained in any such clause and the corresponding clause
contained in the Other Standby Purchase Commitments to which such Affiliated
Standby Purchasers are parties (with the vote of the Affiliated Standby
Purchasers holding at least 85% of the aggregate amount of Unsecured Claims held
by such Affiliated Standby Purchasers to control with respect to the taking of
any such action).

      6. Additional Condition. The Commitment is subject to the further
condition that there shall not have occurred between the Buyer Balance Sheet
Date and the Confirmation Date, and, if the Effective Date does not occur within
90 days following the Confirmation Date, between the Buyer Balance Sheet Date
and the Effective Date (i) any event or events (other than events which affect
generally the economy or the industry in which Arch and MobileMedia conduct
their respective businesses) which has had or would have a material adverse
effect on the business, assets (including licenses, franchise and other
intangible assets), financial condition, operating income or prospects
(determined in each case, where applicable, in accordance with generally
accepted accounting principles and in a manner consistent with the past
practices of Arch and MobileMedia) of Arch, MobileMedia and their respective
subsidiaries, taken as a whole (collectively, the "Combined Company") (a
"Combined Company Material Adverse Effect"), (ii) any event or events involving
a regulatory or statutory change and affecting generally the industry in which
Arch and MobileMedia conduct their respective businesses which would materially
and adversely affect the ability of the Combined Company to operate its
business, or (iii) any event or events affecting generally the industry in which
Arch and MobileMedia conduct their respective business which would materially
and adversely affect the ability of the Combined Company to operate its
business; provided, however, that the Standby Purchaser may not assert the
condition contained in this clause (iii) if each of the Unaffiliated Standby
Purchasers, acting in good faith, shall have waived the condition in Section
6(iii) of the Other Standby Purchase Commitment to which such Unaffiliated
Standby Purchaser is a party.

      7. Consideration for the Commitment. In consideration for the Commitment,
on the Effective Date at the Closing the Standby Purchaser will receive its pro
rata share of Arch Warrants entitling the holders thereof to purchase, in the
aggregate, a number of shares of Existing Arch Common Stock equal to 2.50% of
the issued and outstanding shares of Existing Arch Common Stock and, if
applicable, Arch Class B Common Stock, computed on a Fully
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11


Diluted Basis (as defined in the Plan) on the date the "Buyer Market Price" is
determined in accordance with Schedule II to the Merger Agreement giving effect
to the Plan as if the Effective Date had occurred on such date and assuming
21,067,110 shares of Existing Arch Common Stock are issued and outstanding
immediately prior thereto. Such Arch Warrants will be delivered to the Standby
Purchaser and the Other Standby Purchasers, in accordance with the percentages
specified in Column D of Annex I hereto.

      8. Satisfaction of the Commitment. The Standby Purchaser may, in its sole
discretion, satisfy the Commitment directly and/or indirectly through one or
more of its affiliates, separate accounts within its control or investment funds
under its or its affiliates' management.

      9. Representations and Warranties. (a) Arch hereby represents and warrants
to the Standby Purchaser that:

                  (i) Arch is a corporation duly organized, validly existing and
            in good standing under the laws of the State of Delaware and has all
            requisite corporate power and authority to execute, deliver and
            perform its obligations hereunder and to consummate the transactions
            contemplated hereby;

                  (ii) Subject to the approval of the Buyer Charter Amendment
            and the Buyer Share Issuance by the Stockholders of Arch, the
            execution, delivery and performance of this letter agreement by Arch
            and the consummation by Arch of the transactions contemplated hereby
            have been duly and validly authorized by all necessary corporate
            action on the part of Arch;

                  (iii) This letter agreement constitutes the legal, valid and
            binding obligation of Arch, enforceable against Arch in accordance
            with its terms;

                  (iv) Except as described in Section 3.3 of the Buyer
            Disclosure Schedule and except for the applicable requirements of
            the Securities Act, the Exchange Act and any applicable state and
            foreign securities laws, the HSR Act, the Communications Act and the
            regulations of the FCC, state public utility, telecommunications or
            public service laws and the Bankruptcy Code, the Confirmation Order
            and the Amended Plan (collectively, the "Applicable Requirements"),
            the execution, delivery and performance of this letter agreement by
            Arch and the consummation by Arch of the transactions contemplated
            hereby in accordance with the terms hereof do not and will not
            conflict with, violate or constitute a breach of any material
            contract, agreement or instrument by which
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 12


            Arch is bound or any judgment, order, decree, law, statute, rule,
            regulation or other judicial or governmental restriction to which
            Arch is subject;

                  (v) Except as described in the Buyer Disclosure Schedule, the
            representations and warranties of Arch contained in the Merger
            Agreement (other than those contained in Sections 3.6, 3.7, 3.26 and
            3.27 thereof), which representations and warranties shall be deemed
            for purposes of this clause (v) not to include any qualification or
            limitation with respect to materiality (whether by reference to
            "Buyer Material Adverse Effect" or otherwise), are true and correct,
            except where the matters in respect of which such representations
            and warranties are not true and correct would not have a Buyer
            Material Adverse Effect;

                  (vi) True, complete and correct copies of the following
            documents are attached hereto as indicated:

                                Document                         Exhibit Hereto
            ----------------------------------------------       --------------
            Merger Agreement (including all exhibits                     A
            and schedules thereto) 
            
            Buyer Disclosure Schedule                                    B 
            
            Other Standby Purchase Commitments                           C 
            
            Certificate of Incorporation of Arch, as                     D 
            amended through the date hereof 
            
            By-laws of Arch, as amended through the                      E 
            date hereof 
            
            Rights Agreement, dated as of October 13,                    F 
            1995, between Arch and the Bank of New
            York, as Rights Agent, as amended 
            through the date hereof (the "Rights
            Agreement") 
            
            Draft of the Proxy Statement dated                           G 
            August 18, 1998 (the "Draft Proxy Statement")
            
            
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 13

                          Document                               Exhibit Hereto
            ----------------------------------------             --------------
            Existing Registration Rights Agreements                     H
            (as defined in Section 9(a)(xi) below),

            Bridge Commitment Letter                                    I
            
                  (vii) As of the date hereof, the Draft Proxy Statement
            contains no untrue statement of a material fact or omits to state
            any material fact necessary, in light of the circumstances under
            which it was made, in order to make the statements therein not
            misleading; provided, however, Arch makes no representation with
            respect to either (A) information supplied by MobileMedia for
            inclusion therein or (B) the descriptions of the Merger Agreement,
            the Plan and the other exhibits to the Merger Agreement, and of this
            letter agreement and the Other Standby Purchase Commitments,
            contained therein;

                  (viii) No representation or warranty of Arch contained in this
            letter agreement, and no statement relating to Arch contained in the
            Merger Agreement, the Buyer Disclosure Schedule or any other
            document, certificate or other instrument delivered or to be
            delivered by or on behalf of Arch pursuant to this letter agreement
            (including the definitive Proxy Statement and the Registration
            Statement as declared effective by the SEC), contains or will as of
            the Effective Date contain any untrue statement of a material fact
            or omits or will as of the Effective Date omit to state any material
            fact necessary, in light of the circumstances under which it was or
            will be made, in order to make the statements herein or therein not
            misleading;

                  (ix) Between the Buyer Balance Sheet Date and the date hereof,
            there has not occurred with respect to Arch (A) any event or events
            (other than events which affect generally the economy or the
            industry in which Arch and MobileMedia conduct their respective
            businesses) which has had or would have a Combined Company Material
            Adverse Effect or (B) any event or events involving a regulatory or
            statutory change and affecting generally the industry in which Arch
            and MobileMedia conduct their respective business which would
            materially and adversely affect the ability of the Combined Company
            to operate its business;

                  (x) The shares of Existing Arch Common Stock to be issued and
            distributed as contemplated by Section 1.3(e) and Section 1.6 of the
            Merger Agreement and the shares of Existing Arch Common Stock, the
            shares of Arch
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 14


            Class B Common Stock, if applicable, and the Arch Warrants to be
            issued and delivered as contemplated by Section 1 and Section 3
            above, and the Arch Warrants to be issued as contemplated by Section
            7 above, in each case when so issued and distributed or delivered,
            as the case may be, and the shares of Existing Arch Common Stock
            issued upon conversion of such shares of Arch Class B Common Stock,
            if applicable, when so converted in accordance with the Arch Charter
            Amendment, and the shares of Existing Arch Common Stock issued upon
            exercise of such Arch Warrants, when issued, paid for and delivered
            as provided in the Arch Warrant Agreement, will be duly authorized,
            validly issued, fully paid, nonassessable and free of all preemptive
            rights; and

                  (xi) Schedule 9(a)(xi) hereto sets forth a true, complete and
            correct list of all agreements that are in effect as of the date
            hereof pursuant to which the Company has granted any registration
            rights to any person or entity (the "Existing Registration Rights
            Agreements"), and, except as specified in Schedule 9(a)(xi) hereto,
            none of the Existing Registration Rights Agreements is inconsistent
            with the rights to be granted to the Standby Purchaser pursuant to
            the Registration Rights Agreement.

            (b) MobileMedia hereby represents and warrants to the Standby
Purchaser that:

                  (i) MobileMedia is a corporation duly organized, validly
            existing and in good standing under the laws of the State of
            Delaware and, subject to the entry of the Confirmation Order, has
            all requisite corporate power and authority to execute, deliver and
            perform its obligations hereunder and to consummate the transactions
            contemplated hereby;

                  (ii) Subject to the entry of the Confirmation Order, the
            execution, delivery and performance of this letter agreement by
            MobileMedia and the consummation by MobileMedia of the transactions
            contemplated hereby have been duly and validly authorized by all
            necessary corporate action on the part of MobileMedia;

                  (iii) Subject to the entry of the Confirmation Order and the
            effectiveness of the Plan, this letter agreement constitutes the
            legal, valid and binding obligation of MobileMedia, enforceable
            against MobileMedia in accordance with its terms;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 15


                  (iv) Subject to entry of the Confirmation Order, and except as
            described in Section 2.3 of the Company Disclosure Schedule and
            except for the Applicable Requirements, the execution, delivery and
            performance of this letter agreement by MobileMedia and the
            consummation by MobileMedia of the transactions contemplated hereby
            in accordance with the terms hereof do not and will not conflict
            with, violate, or constitute a breach of any material contract,
            agreement or instrument by which MobileMedia is bound or any
            judgment, order, decree, law, statute, rule, regulation or other
            judicial or governmental restriction to which MobileMedia is
            subject;

                  (v) Except as described in the Company Disclosure Schedule,
            the representations and warranties of MobileMedia contained in the
            Merger Agreement (other than those contained in Sections 2.6, 2.7,
            2.23 and 2.24 thereof), which representations and warranties shall
            be deemed for purposes of this clause (v) not to include any
            qualification or limitation with respect to materiality (whether by
            reference to "Company Material Adverse Effect" or otherwise), are
            true and correct, except where the matters in respect of which such
            representations and warranties are not true and correct would not
            have a Company Material Adverse Effect;

                  (vi) True, complete and correct copies of the following
            documents are attached hereto as indicated:

                           Document                              Exhibit Hereto
            --------------------------------------------         --------------
            Merger Agreement (including all exhibits                  A
            and schedules thereto)                            
                                                              
            Other Standby Purchase Commitments                        C 
                                                              
            Company Disclosure Schedule                               J 
                                                              
            Agreement, dated the date hereof (the                     K 
            "Debtor/Committee Agreement"), between            
            MobileMedia, on behalf of itself and the          
            other Debtors, and the Committee (as              
            defined in the Plan)                              
                                                            
                  (vii) As of the date hereof, the information included in the
            Draft Proxy Statement that was provided for inclusion therein by
            MobileMedia contains no
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 16


            untrue statement of a material fact or omits to state any material
            fact necessary, in light of the circumstances under which it was
            made, in order to make the statements therein not misleading;

                  (viii) No representation or warranty of MobileMedia contained
            in this letter agreement, and no statement relating to MobileMedia
            contained in the Merger Agreement, the Company Disclosure Schedule
            or any other document, certificate, or other instrument delivered or
            to be delivered by or on behalf of MobileMedia pursuant to this
            letter agreement, contains or will as of the Effective Date contain
            any untrue statement of a material fact or omits or will as of the
            Effective Date omit to state any material fact necessary, in light
            of the circumstances under which it was or will be made, in order to
            make the statements herein or therein not misleading; and

                  (ix) Between the Company Balance Sheet Date and the date
            hereof, there has not occurred with respect to MobileMedia (A) any
            event or events (other than events which affect generally the
            economy or the industry in which Arch and MobileMedia conduct their
            respective businesses) which has had or would have a Combined
            Company Material Adverse Effect or (B) any event or events involving
            a regulatory or statutory change and affecting generally the
            industry in which Arch and MobileMedia conduct their respective
            businesses which would materially and adversely affect the ability
            of the Combined Company to operate its business.

            (c) Whippoorwill, with respect to itself, and as general partner
and/or agent for, each Whippoorwill Account, with respect to such Whippoorwill
Account, hereby represents and warrants to each of Arch and MobileMedia that:

                  (i) Whippoorwill is a corporation duly organized, validly
            existing and in good standing under the laws of the State of
            Delaware and has authority to execute this Agreement on behalf of
            each Whippoorwill Account and to cause each of them to perform its
            obligations hereunder and to consummate the transactions
            contemplated hereby;

                  (ii) The execution and delivery of this letter agreement by
            Whippoorwill on behalf of each Whippoorwill Account, and each
            Whippoorwill Account's performance hereunder and the consummation by
            each Whippoorwill Account of the transactions contemplated hereby,
            have been duly and validly authorized by all necessary corporate or
            partnership action;
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 17


                  (iii) This letter agreement constitutes the legal, valid and
            binding obligation of each Whippoorwill Account, enforceable against
            the Whippoorwill Account in accordance with its terms;

                  (iv) Except for the Applicable Requirements, the execution,
            delivery and performance of this letter agreement by Whippoorwill on
            behalf of each Whippoorwill Account and the consummation by each
            Whippoorwill Account of the transactions contemplated hereby in
            accordance with the terms hereof do not and will not conflict with,
            violate or constitute a breach of any material contract, agreement
            or instrument by which Whippoorwill or such Whippoorwill Account is
            bound or any judgment, order, decree, law, statute, rule, regulation
            or other judicial or governmental restriction to which either
            Whippoorwill or any Whippoorwill Account is subject, except where
            such conflicts, violations or breaches, individually or in the
            aggregate, would not have a material adverse effect on the ability
            of the Whippoorwill Account to consummate the transactions
            contemplated hereby;

                  (v) No representation or warranty of Whippoorwill or any
            Whippoorwill Account contained in this letter agreement, and no
            statement contained in any other document, certificate or other
            instrument delivered or to be delivered by or on behalf of
            Whippoorwill or any Whippoorwill Account pursuant to this letter
            agreement, contains or will as of the Effective Date contain any
            untrue statement of a material fact or omits or will as of the
            Effective Date omit to state any material fact necessary, in light
            of the circumstances under which it was or will be made, in order to
            make the statements herein or therein not misleading; and

                  (vi) As of the date hereof, the Standby Purchaser holds the
            aggregate stated principal amount of 9 3/8% Notes and 10 1/2% Notes
            (as such terms are defined in the Plan) indicated under the Standby
            Purchaser's name and address on Annex I hereto.

            (d) None of the representations and warranties made herein or in any
certificate to be delivered as contemplated hereby will survive the Closing.

            (e) Notwithstanding any provision of this letter agreement, (i) the
obligation of each Whippoorwill Account is several and not joint and limited to
the Whippoorwill Account's percentage of the whole as set forth opposite its
name on Schedule A to Annex I hereto, (ii) no Whippoorwill Account will have any
liability or obligation on account of any other Whippoorwill
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 18


Account's breach of this letter agreement or default hereunder, and (iii)
neither Arch nor MobileMedia will have recourse against any shareholder,
partner, director, officer, employee, beneficiary, trustee, agent or independent
contractor (A) of Whippoorwill, in respect to any liability or obligation
assumed or undertaken by Whippoorwill hereunder in its own capacity, or (B) of
any Whippoorwill Account in respect of any liability or obligation undertaken by
the Whippoorwill Account hereunder.

      10. Certain Covenants. (a) Each of Arch and MobileMedia (i) acknowledges
that the Debtors have agreed to provide to the Committee copies of any and all
notices, documents or information to be provided by or made available by the
Debtors to Arch pursuant to the Merger Agreement or provided by or made
available by Arch to the Debtors pursuant to the Merger Agreement, promptly
after the receipt or provision thereof by or to the Debtors, as applicable, and
that the Committee, pursuant to the undertaking attached as Annex II hereto, has
agreed to distribute copies of the same to the Standby Purchaser and to take
certain other actions and (ii) agrees that the Committee may do so.

            (b) Without limiting the generality of the foregoing clause (a) of
this Section 10, Arch will, before filing the Registration Statement with the
SEC, furnish to the Standby Purchaser and its counsel copies of the Registration
Statement (including all exhibits thereto) proposed to be filed, will provide
the Standby Purchaser and its counsel a reasonable opportunity to review and
comment on such Registration Statement and will not file such Registration
Statement if the Standby Purchaser shall reasonably object thereto within three
calendar days after the receipt thereof.

            (c) Arch will deliver to the Standby Purchaser copies of the
definitive Proxy Statement in the form filed with the SEC and mailed to
Stockholders of Arch and the Registration Statement in the form declared
effective by the SEC.

            (d) Without limiting the generality of the foregoing clause (a) of
this Section 10, Arch will, before filing the Shelf Registration Statement or
any pre-effective amendment thereto, furnish to the Standby Purchaser and its
counsel copies of the Shelf Registration Statement or such pre-effective
amendment thereto, as applicable, proposed to be filed, will provide Standby
Purchaser and its counsel with a reasonable opportunity to review and comment on
the Shelf Registration Statement or such pre-effective amendment thereto, as
applicable, and will not file the Shelf Registration Statement or such
pre-effective amendment thereto, as applicable, to which the Standby Purchaser
or its counsel shall reasonably object within three business days after the
receipt thereof. The Standby Purchaser will furnish to Arch such information
regarding the Standby Purchaser and its plan and method of distribution of the
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 19


Registrable Securities as Arch may reasonably request in writing in connection
with the preparation of the Shelf Registration Statement.

            (e) Each of Arch, MobileMedia and the Standby Purchaser will use its
reasonable best efforts to obtain all approvals, waivers, consents and other
authorizations required by the Applicable Requirements, including without
limitation the applicable requirement of the HSR Act, necessary in connection
with the performance of this letter agreement by the Standby Purchaser and the
consummation by the Standby Purchaser of the transactions contemplated hereby.

            (f) Arch will, as requested by the Standby Purchaser, either pay
directly to the appropriate Governmental Entity, on behalf of the Standby
Purchaser, or reimburse the Standby Purchaser for, any fees required to be paid
by the Standby Purchaser in connection with its compliance with the applicable
requirements of the HSR Act. In addition, following the Effective Date, Arch
will reimburse, promptly upon written request (accompanied by appropriate
supporting documentation), costs and expenses (including without limitation
reasonable fees and expenses of legal counsel, including a reasonable allocation
with respect to the cost of any internal counsel), not to exceed $100,000,
incurred by the Standby Purchaser in connection with this letter agreement and
the transactions contemplated hereby.

      11. Certain Prohibited Transactions. The Standby Purchaser hereby
covenants that, from and after the date hereof, so long as its commitment
hereunder remains in effect, it will not sell, or enter into any agreement
relating to the sale (including without limitation any short sale, equity swap
or other hedge position) of, any shares of Arch capital stock or, except as
otherwise expressly contemplated by this Section 11, engage in any other
disposition of such shares that might negatively affect the market price of such
shares; provided, however, that the foregoing provision will not apply to any
agreement entered into prior to the date hereof (if not entered into in
contemplation of the transactions contemplated by the Plan, the Merger Agreement
or this letter agreement) or any transaction effected pursuant to the terms
thereof. Notwithstanding the immediately preceding sentence, but subject to
Section 3 above and Section 12 below, the Standby Purchaser may at any time, as
it may determine in its sole and absolute discretion, sell or otherwise
transfer, or acquire, or enter into any agreement relating to the sale, transfer
or acquisition of, Rights or Unsecured Claims. The Standby Purchaser
acknowledges that it has received copies of the Rights Agreement and the
amendment thereto attached as Exhibit D to the Merger Agreement (the "Rights
Plan Amendment"). Arch hereby covenants that it will not, without the prior
written consent of the Standby Purchaser, further amend the Rights Agreement in
any manner that would eliminate or reduce the ownership thresholds applicable to
the Standby Purchaser thereunder; provided, however, that this sentence shall
cease to be of any further force
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 20


or effect at such time after the Effective Date as the Standby Purchaser ceases
to beneficially own in the aggregate at least 10.0% of the outstanding shares of
Existing Arch Common Stock.

      12. Voting Agreement. The Standby Purchaser hereby covenants that so long
as the Bankruptcy Court approves the Disclosure Statement not later than
December 31, 1998 and the Confirmation Order is entered not later than March 31,
1999, (a) it will vote, or cause to be voted, for the acceptance of the Plan all
Unsecured Claims held by it on the date fixed for determining holders of
Unsecured Claims entitled to vote for acceptance or rejection of the Plan (the
"Record Date"), (b) it will not withdraw or otherwise revoke, or cause to be
withdrawn or otherwise revoked, such vote for the acceptance of the Plan, and
(c) it will not grant, or cause to be granted, to any other person or entity any
proxy to vote with respect to any such Unsecured Claims (other than a proxy to
vote for the acceptance of the Plan). Except with respect to Whippoorwill
Accounts which cease to be within Whippoorwill's control and investment funds
which cease to be under Whippoorwill's management, the Standby Purchaser will
not, on or prior to the Record Date, sell or otherwise transfer any Unsecured
Claims held by it unless the transferee shall have agreed in writing in the form
attached as Annex III hereto (i) to vote for the acceptance of the Plan with
respect to such Unsecured Claims and (ii) not to sell or otherwise transfer such
Unsecured Claims unless its transferee shall agree to be bound in the same
manner provided in this sentence with respect to such Unsecured Claims.

      13. Other Standby Purchase Commitments. (a) Each of Arch and MobileMedia
covenants that it will not agree to any amendment or modification to any of the
letter agreements, dated the date hereof, among Arch, MobileMedia and any of the
Other Standby Purchasers (the "Other Standby Purchase Commitments"), without the
prior written consent of the Standby Purchaser. Notwithstanding the immediately
preceding sentence, Arch and MobileMedia may, without the prior written consent
of the Standby Purchaser, agree to an amendment or modification to any of the
Other Standby Purchase Commitments to the extent that (i) such amendment or
modification has the sole effect of reducing or eliminating the financial
commitment thereunder and (ii) simultaneously therewith, a qualified
institutional buyer (as such term is defined in Rule 144A promulgated under the
Securities Act) reasonably acceptable to the Standby Purchaser makes a
commitment in a corresponding amount on terms identical in all material respects
to those set forth in such Other Standby Purchase Commitment.

            (b) The Standby Purchaser will have no liability for the commitment
of any Other Standby Purchaser under any Other Standby Purchase Commitments or
the commitment of any other person contemplated by Section 13(a) above.

      14. Certain Notices; Certain Information. (a) Each of Arch and MobileMedia
hereby covenants that it will promptly deliver to the Standby Purchaser, and the
Standby Purchaser
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 21


hereby covenants that it will promptly deliver to Arch and MobileMedia, written
notice of any matter, event or development that would (i) render any
representation or warranty made by it herein inaccurate or incomplete in any
respect or (ii) constitute or result in a breach by it of, or a failure by it to
comply with, any covenant herein applicable to it.

            (b) Each of Arch and MobileMedia will furnish the Standby Purchaser
with such information regarding itself as the Standby Purchaser may reasonably
request.

      15. Certain Consent Rights. (a) Notwithstanding anything to the contrary
herein contained, except as expressly contemplated by the Merger Agreement or
the Plan, Arch hereby covenants that it will not take, or agree in writing to
take, any action contemplated by Section 4.5(b)(ii), (iii), (iv), (viii) or (ix)
of the Merger Agreement without the prior written consent of the Standby
Purchaser.

            (b) Arch hereby covenants that, without the prior written consent of
the Standby Purchaser, it will not, prior to the Effective Date, enter into any
agreement with respect to its securities, or amend any existing agreement with
respect to its securities (including without limitation the Existing
Registration Rights Agreements) in any manner inconsistent with the rights to be
granted to the Standby Purchaser pursuant to the Registration Rights Agreement.

      16. Board Representation. Arch hereby covenants that: (a) on or prior to
the Effective Date, Arch will cause a vacancy to be created on its Board of
Directors (by increasing the number of members of such Board or otherwise) and
effective no later than the Effective Date will cause one person designated by
the Standby Purchaser (the "Designee") to be elected or appointed to such Board
with an initial term expiring at Arch's Annual Meeting of Stockholders to be
held in the year 2000; and (b) so long as the Standby Purchaser beneficially
owns (as a result of its discretionary control of accounts, management
discretion over investment funds or otherwise) capital stock of Arch
representing at least (x) with respect to Arch's Meeting of Stockholders to be
held in the year 2003 and meetings of Arch's stockholders held prior thereto,
5.0% and (y) with respect to meetings of Arch's stockholders held thereafter
10.0%, of the outstanding voting power, Arch will (i) nominate and recommend the
Designee (or another person designated by the Standby Purchaser as the
Designee's successor) for election at any meeting of Arch's stockholders at
which the term of the Designee or any successor thereto would otherwise expire
and (ii) fill any vacancy on Arch's Board of Directors created by the death,
resignation or removal of the Designee or any successor thereto with another
person designated by the Standby Purchaser as the Designee's successor. The
Standby Purchaser hereby acknowledges that the Designee will be required to
execute and deliver to Arch a confidentiality agreement in the form executed by
the existing members of Arch's Board of Directors. The commitment of the Standby
Purchaser
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 22


hereunder is subject to the additional condition that Arch shall have performed
its covenant set forth in clause (a) of the first sentence of this Section 16.

      17. Removal of Legends. In the event that, following the transactions
contemplated by the Merger Agreement, the Plan and this letter agreement, any
certificates evidencing securities ("Certificates") of Arch held by the Standby
Purchaser bear a restrictive legend then:

            (a) if the Standby Purchaser delivers to Arch (i) a certificate, in
      a form reasonably satisfactory to Arch, certifying that securities
      evidenced by such Certificate have been transferred pursuant to a
      registration statement that is effective under the Securities Act or (ii)
      a certificate, in a form reasonably satisfactory to Arch, certifying that
      securities evidenced by such Certificate have been transferred without
      registration in accordance with the requirements of Rule 144 under the
      Securities Act, Arch will, or will instruct its transfer agent to, issue
      upon surrender of such Certificate one or more new Certificates evidencing
      the securities so transferred evidenced by the Certificate so surrendered,
      which new Certificate or Certificates will not bear any such legend; and

            (b) if the Standby Purchaser delivers to Arch an opinion of counsel
      to the Standby Purchaser (which may be internal counsel to the Standby
      Purchaser) that, in the opinion of such counsel, such legend is not, or is
      no longer, required to ensure compliance with the Securities Act, Arch
      will, or will instruct its transfer agent to, issue upon surrender of such
      Certificate one or more new Certificates evidencing the securities
      evidenced by the Certificate so surrendered, which new Certificate or
      Certificates will not bear any such legend.

                           *     *     *     *     *

      If you are in agreement with the foregoing, please execute the enclosed
copy of this letter agreement as indicated and return it to the undersigned.
This letter agreement will become effective upon (i) the delivery to us of
executed counterparts of this letter agreement by each of you and (ii) the
execution and delivery of each of the Other Standby Purchase Commitments by each
of the parties thereto. Once effective, this letter agreement will terminate on
(i) the date on which the Debtor Tower Agreement is terminated, unless prior to
or simultaneously with such termination, MobileMedia shall have entered into a
definitive agreement (which shall be comparable in form and substance to the
Debtor Tower Agreement and a copy of which shall be delivered to the Standby
Purchaser promptly following the execution thereof), with a bona fide
third-party purchaser providing for a sale to such third party of the assets or
substantially all of the assets to be sold to Pinnacle pursuant to the Debtor
Tower Agreement resulting in net proceeds to MobileMedia of not less than $165.0
million (an "Acceptable Sale"), (ii) December 31, 1998,
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 23


unless the Closing (as defined in the Debtor Tower Agreement) or the closing of
an Acceptable Sale shall have occurred on or before such date, (iii) March 31,
1999, unless the Confirmation Order shall have been entered by the Bankruptcy
Court on or before such date, (iv) June 30, 1999, unless the effectiveness of
the Plan occurs on or before such date, or (v) if not theretofore terminated
pursuant to one of the foregoing clauses, the date on which the Merger Agreement
is terminated in accordance with the terms thereof.

      All notices and other communications hereunder must be in writing. Any
notice or other communication hereunder will be deemed duly delivered three
business days after it is sent by registered or certified mail, return receipt
requested, postage prepaid, or two business days after it is sent via a
reputable international overnight courier service, in each case to the intended
recipient at the address therefor set forth on the signature page hereto. Any
party hereto may give any notice or other communication hereunder by personal
delivery or telecopy, but no such notice or other communication will be deemed
to have been duly given unless and until it actually is received by the party
for whom it is intended. Any party may change the address to which notices and
other communications hereunder are to be delivered by giving the other parties
notice in the manner herein set forth.

      This letter agreement represents the final agreement among the parties
hereto with respect to the subject matter hereof and may not be contradicted by
evidence of prior or contemporaneous agreements of the parties. There are no
unwritten oral agreements between the parties relating to the subject matter
hereof. This letter agreement may not be amended or modified except by a written
instrument signed by each of the Standby Purchaser, Arch and MobileMedia.

      This letter agreement shall be governed by and construed in accordance
with the laws of the State of Delaware without regard to its principles of
conflicts of law.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 24


      This letter agreement may be executed in counterparts which, taken
together, shall constitute one and the same instrument.

                                    Very truly yours,

                                    Whippoorwill Associates, Inc.,
                                    as general partner of and/or as agent for,
                                    each Whippoorwill Account


                                    By:
                                       ----------------------------------------
                                    Its:
                                        ---------------------------------------
                                    Address:    11 Martine Avenue
                                                White Plains, New York 10606
                                                Attn:  David Strumwasser


ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.

By:
   ----------------------------------------
Its:
    ---------------------------------------

Address:  1800 West Park Drive, Suite 250
          Westborough, MA  01581
          Attn:  Chairman and Chief
                 Executive Officer

With copy to: Hale and Dorr LLP
              60 State Street
              Boston, MA  02109
              Attn:  Jay E. Bothwick
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 25


Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.


By:
   ----------------------------------------
Its:
    ---------------------------------------

Address:   Fort Lee Executive Park
           One Executive Drive, Suite 500
           Fort Lee, NJ  07024
           Attn:  Chairman - Restructuring

With copy to: Sidley & Austin
              875 Third Avenue, Suite 1400
              New York, New York 10022
              Attn:  James D. Johnson
<PAGE>

                                                                         ANNEX I
                                                                         -------

                               COMMITMENT AMOUNTS
                              (dollars in millions)

<TABLE>
<CAPTION>
                                                 Column A          Column B           Column C        Column D
                                                 --------          --------           --------        --------

                                              Rights Exercise  Unexercised Rights      Total       
                                                Commitment        Commitment        Commitment       Commitment
Name and Address of Standby Purchasers          Amount (1)        Amount (2)           Amount        Percentage
- --------------------------------------          ----------        ----------           ------        ----------
<S>                                              <C>               <C>                <C>              <C>   
W.R. Huff Asset Management Co., L.L.C., as       $39.27            $35.80             $75.07           34.60%
  agent for its affiliates and discretionary
  accounts
67 Park Place, 9th Floor
Morristown, New Jersey  07960
Stated Principal Amount of 9 3/8% Notes:
$  57,847,000                                                                                    
Stated Principal Amount of 10 1/2% Notes:                                                          
$  27,970,000                                                                                    
                                                                                                   
The Northwestern Mutual Life Insurance           $10.95             $9.97             $20.92            9.64%
  Company*                                                                                         
720 East Wisconsin Avenue                                                                          
Milwaukee, Wisconsin  53202                                                                        
Stated Principal Amount of 9 3/8% Notes:                                                           
$  19,776,000                                                                                      
Stated Principal Amount of 10 1/2% Notes:                                                          
$   3,350,000                                                                                     
                                                                                                   
The Northwestern Mutual Life Insurance            $2.65             $2.42              $5.07            2.34%
  Company for its Group Annuity Separate                                                           
  Account*                                                                                         
720 East Wisconsin Avenue                                                                          
Milwaukee, Wisconsin  53202                                                                        
Stated Principal Amount of 9 3/8% Notes:                                                           
$     -0-                                                                                      
Stated Principal Amount of 10 1/2% Notes                                                           
$   7,000,000                                                                                      
</TABLE>

- --------                                                                      
* The Northwestern Mutual Life Insurance Company, The Northwestern Mutual Life
Insurance Company for its Group Annuity Separate Account and Northwestern Mutual
Series Fund, Inc. for the High Yield Bond Portfolio are affiliated entities for
purposes of clauses (a) and (k) of Section 5 and clause (iii) of Section 6.
<PAGE>

                               COMMITMENT AMOUNTS
                              (dollars in millions)

<TABLE>
<CAPTION>
                                                     Column A            Column B           Column C     Column D
                                                     --------            --------           --------     --------

                                                  Rights Exercise    Unexercised Rights      Total
                                                    Commitment          Commitment        Commitment    Commitment
Name and Address of Standby Purchasers              Amount (1)          Amount (2)           Amount     Percentage
- --------------------------------------             ------------        ------------         --------   -----------
<S>                                                 <C>                  <C>               <C>           <C>  
Northwestern Mutual Series Fund, Inc. for the         $.75                 $.69              $1.44         0.66%
  High Yield Bond Portfolio*                                                              
720 East Wisconsin Avenue                                                                 
Milwaukee, Wisconsin  53202                                                               
Stated Principal Amount of 9 3/8% Notes:                                                  
$       -0-                                                                               
Stated Principal Amount of 10 1/2% Notes:                                                 
$     2,000,000                                                                           
                                                                                          
Credit Suisse First Boston Corporation              $29.48               $26.88             $56.36        25.97%
11 Madison Avenue, 4th Floor                                                              
New York, New York 10010                                                                  
Stated Principal Amount of 9 3/8% Notes:                                                  
$   32,453,000                                                                            
Stated Principal Amount of 10 1/2% Notes:                                                 
$   35,930,000                                                                            
                                                                                          
Whippoorwill Associates, Inc., as general partner   $30.42               $27.72             $58.14        26.79%
  and/or agent for the parties set forth on                                               
  Schedule A hereto in the percentages noted                                              
  thereon                                                                                 
11 Martine Avenue                                                                         
White Plains, New York 10606                                                              
Stated Principal Amount of 9 3/8% Notes:                                                  
$   37,855,000                                                                            
Stated Principal Amount of 10 1/2% Notes:                                                 
$   31,410,000                                                                            
                               Total:              $113.52              $103.48            $217.00       100.00%

</TABLE>                

- -------------------------------------                                      
(1) The "Rights Exercise Commitment Amount", for each Standby Purchaser, shall
    mean an amount equal to the product of (i) the Rights Subscription Price (as
    defined in Schedule II to the Merger Agreement) and (ii) the number of
    Rights issuable in respect of an amount of Allowed Unsecured Claims derived
    from the principal amount of 9 3/8% Notes and the 10 1/2% Notes indicated
    under the Standby Purchaser's name on this Annex I held by such Standby
    Purchaser on the date hereof. The dollar amounts set forth under Column A
    are estimates provided for illustrative purposes only, based on the
    assumptions that (x) there is a total of $475 million of Allowed Unsecured
    Claims, (y) there is no Rights Reserve (as defined in the Plan), and (z) the
    aggregate amount of Subordinated Noteholder Claims (as defined in the Plan)
    is $441,819,762.

(2) The "Unexercised Rights Commitment Amount", for each Standby Purchaser,
    shall mean an amount equal to (i) the Total Commitment Amount indicated in
    Column C for such Standby Purchaser less (ii) the Rights Exercise Commitment
    Amount for such Standby Purchaser. The dollar amounts set forth under Column
    B are estimates provided for illustrative purposes only, based on the
    estimates set forth in Column A.
<PAGE>

                                                                      ANNEX II
                                                                      --------

                                   UNDERTAKING

        The Committee hereby undertakes to distribute to the Standby Purchaser
(until instructed by the Standby Purchaser to do otherwise) copies of any and
all notices, documents or information to be provided by or made available by the
Debtors to Arch pursuant to the Merger Agreement or provided by or made
available by Arch to the Debtors pursuant to the Merger Agreement that are
received by the Committee pursuant to the Debtor/Committee Agreement as soon as
practicable with its receipt thereof. The Committee hereby further undertakes to
consult with the Standby Purchaser (until instructed by the Standby Purchaser to
do otherwise) prior to delivering any written consent or exercising any other
right of the Committee (other than the distribution of notices, documents or
information to the Standby Purchaser or the Other Standby Purchasers) pursuant
to the Debtor/Committee Agreement or the Plan. The Committee will not enter into
any amendment to the Debtor/Committee Agreement without the prior written
consent of the Standby Purchaser.

                                           THE OFFICIAL COMMITTEE
                                           OF UNSECURED CREDITORS


                                           By:
                                              ---------------------------------
                                           Its:
                                               --------------------------------
          
<PAGE>

                                                                     ANNEX III
                                                                     ---------

                                VOTING AGREEMENT

  The undersigned transferee of indebtedness of MobileMedia Corporation or one
of its direct or indirect subsidiaries (collectively, "MobileMedia") described
in Schedule A attached hereto (the "Claim"), hereby acknowledges and agrees as
follows:

  1.    MobileMedia is a debtor-in-possession under Chapter 11 of the Bankruptcy
        Code and has proposed a First Amended Joint Plan of Reorganization dated
        August __, 1998 (the "Amended Plan").

  2.    By acquiring the Claim the undersigned may also acquire rights to vote
        on the adoption of the Amended Plan.

  3.    As a condition of the transfer of the Claim, the undersigned hereby
        agrees to exercise all voting rights it may have as holder of the Claim
        in favor of the Amended Plan unless the Amended Plan shall have been
        withdrawn.

  4.    The undersigned agrees that it shall not subsequently transfer the Claim
        or any portion thereof unless and until it obtains from its transferee a
        Voting Agreement identical to the form hereof.

  IN WITNESS HEREOF, the undersigned transferee has executed this Voting
Agreement this _____ day of __________, 199_.

                                                 [TRANSFEREE]


                                           By:
                                              ------------------------------
                                              Title:


Accepted By:


- -------------------------
[Transferor]

<PAGE>

                                   SCHEDULE A
                                       TO
                                VOTING AGREEMENT


[Describe Claim.]

<PAGE>

                                                             SCHEDULE 9(a)(xi)
                                                             -----------------

Existing Registration Rights Agreement

(1)   Registration Rights Agreement, dated as of June 24, 1998, by and among
      Arch Communications Group, Inc., Sandler Capital Partner, 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, as amended

(2)   Registration Rights Agreement, dated as of June 29, 1998, Arch
      Communications Group, Inc. Adelphia Communications Corporation and
      Lisa-Gaye Shearing

Inconsistencies:

The provisions of the Registration Rights Agreement listed at (2) above are
inconsistent in certain respects with the provisions of the Registration Rights
Agreement.


                                     -31-
<PAGE>

                                                                       Exhibit L




                     CREDIT SUISSE FIRST BOSTON CORPORATION
                         11 Madison Avenue, Fourth Floor
                            New York, New York 10010

                                 August 18, 1998


Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts  01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey  07024

            Re:   Commitment to Purchase Stock and Warrants

Gentlemen:

      Arch Communications Group, Inc., a Delaware corporation ("Arch"), and
MobileMedia Communications, Inc., a Delaware corporation ("MobileMedia"), intend
to engage in a business combination transaction (the "Combination") as part of a
reorganization (the "Reorganization") of MobileMedia, MobileMedia Corporation,
the sole stockholder of MobileMedia ("Parent"), and all of MobileMedia's
subsidiaries (collectively, the "Debtors") pursuant to chapter 11 of title 11,
United States Code, 11 U.S.C. ss.ss. 101 et seq. (the "Bankruptcy Code"). It is
our understanding that in connection with the Reorganization, among other
things: (a) pursuant to the Agreement and Plan of Merger, dated as of the date
hereof (the "Merger Agreement"), among Arch, a wholly owned subsidiary of Arch
("Merger Sub"), Parent and MobileMedia, MobileMedia will merge with and into
Merger Sub, with Merger Sub continuing as the surviving corporation and a wholly
owned subsidiary of Arch; (b) pursuant to the Merger Agreement, Arch will make
available for distribution pursuant to a plan of reorganization of the Debtors
in the form attached as Exhibit A to the Merger Agreement, with such amendments
and modifications thereto as are made in a manner consistent with clause (e) of
Section 5 hereto (such plan of reorganization being referred to herein as the
"Plan"), (i) cash, (ii) shares of its Common Stock, par value $.01 per share
("Existing Arch Common Stock"), and (iii) warrants entitling the holders thereof
to purchase shares of Existing Arch Common Stock ("Arch Warrants"), with such
Arch Warrants to be issued pursuant to, and to have the terms set forth in, a
warrant agreement in the form attached as Exhibit B to the Merger Agreement (the
"Arch Warrant Agreement"); (c) holders of unsecured non-priority claims against
the Debtors ("Unsecured Claims"), to the extent such Unsecured Claims are
Allowed (as defined in the Plan), will receive pursuant to the Plan (i) shares
of Existing Arch 
<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2


Common Stock and (ii) rights to purchase ("Rights") for cash units
consisting of (A) shares of Existing Arch Common Stock and (B) Arch Warrants;
(d) holders of claims arising under or relating to the Credit Agreement, dated
December 4, 1995, as amended, among MobileMedia and the other parties thereto
("Secured Claims"), to the extent such Secured Claims are Allowed, will receive
pursuant to the Plan cash in an amount equal to 100% of such claims; (e) all of
the outstanding equity interests in MobileMedia and Parent will be canceled
without consideration and Parent will be dissolved; and (f) the commitments
under the DIP Loan Agreement will terminate and all amounts owed under or in
respect of the DIP Loan Agreement will be paid in full in cash.

      Terms used herein with initial capital letters that are not otherwise
defined shall have the meanings ascribed to such terms in the Merger Agreement.

      1.    The Commitment. In connection with the foregoing, Credit Suisse
First Boston Corporation (the "Standby Purchaser") hereby advises you of its
commitment (the "Commitment"), subject to the conditions set forth herein:

            (a)   to exercise any Rights distributed to it in respect of its
      Allowed Unsecured Claims in accordance with the Plan and not thereafter
      sold or transferred as permitted by Section 3 below to purchase units
      consisting of shares of Existing Arch Common Stock and Arch Warrants
      underlying such Rights, to the extent that the aggregate purchase price
      payable upon such exercise, as determined in accordance with Schedule II
      to the Merger Agreement (the "Subscription Price"), does not exceed the
      Rights Exercise Commitment Amount of the Standby Purchaser as set forth in
      Annex I hereto;

            (b)   if (i) the Standby Purchaser sells or otherwise transfers any
      or all of (A) the Rights distributed to it in accordance with the Plan or
      (B) Unsecured Claims held by it as of the date hereof in respect of which
      Rights are to be distributed, in each case as permitted by Section 3
      below, and (ii) the Rights sold or transferred by the Standby Purchaser or
      the Rights distributed in respect of Unsecured Claims held by it as of the
      date hereof that are hereafter sold or transferred by the Standby
      Purchaser are not exercised prior to the expiration thereof (at which time
      such Rights will be void and will no longer be exercisable), to purchase
      for cash (based upon the Subscription Price payable upon exercise of such
      Rights) identical units consisting of shares of Existing Arch Common Stock
      and Arch Warrants underlying such unexercised Rights, to the extent that
      the aggregate purchase price therefor, together with the aggregate
      Subscription Price payable upon exercise of Rights exercised as
      contemplated by clause (a) above, does not exceed the Rights Exercise
      Commitment Amount of the Standby Purchaser as set forth in Annex I hereto;
      and

            (c)   if any Rights distributed in accordance with the Plan (other
      than (i) Rights distributed to the Standby Purchaser or the other holders
      of Unsecured Claims listed on Annex I hereto (the "Other Standby
      Purchasers") and retained by them (which Rights are referred to in
<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3


      Section 1(a) above and Section 1(a) of each of the Other Standby Purchase
      Commitments (as defined in Section 13(a) below)) or (ii) subject to
      Section 3(b) below, Rights distributed in respect of Unsecured Claims held
      by the Standby Purchaser or the Other Standby Purchasers as of the date
      hereof that are hereafter sold or transferred by them (which Rights are
      referred to in Sections 1(b) and 3 hereof and Section 1(b) and 3 of each
      of the Other Standby Purchase Commitments)) remain unexercised upon the
      expiration thereof (at which time such Rights will be void and will no
      longer be exercisable), to purchase for cash (based on the Subscription
      Price payable upon exercise of such Rights) pro rata in accordance with
      and up to the Unexercised Rights Commitment Amount of the Standby
      Purchaser as set forth in Annex I hereto identical units consisting of
      shares of Existing Arch Common Stock and Arch Warrants underlying such
      unexercised Rights.

      2.    Arch Class B Common Stock. (a) Notwithstanding anything to the
contrary herein contained, if the purchases by the Standby Purchaser
contemplated by Section 1 above would cause the Standby Purchaser, the Other
Standby Purchasers, and any other persons or entities who, when taken together
with any one or more of the Standby Purchaser and the Other Standby Purchasers,
would constitute a "person" or "group" as used in Section 13(d) or Section 14(d)
of the Exchange Act or Rule 13d-3 or Rule 13d-5 promulgated thereunder, or any
"affiliate" as defined in Rule 405 promulgated under the Securities Act of any
of them (collectively, the "Standby Class B Holders"), in the aggregate, to
beneficially own on the effective date of the Plan (the "Effective Date") shares
representing more than 49.0% of the capital stock of Arch generally entitled to
vote in the election of directors or more than 49.0% of the total voting power
of the capital stock of Arch, Arch will substitute shares of Class B Common
Stock, par value $.01 per share, of Arch ("Arch Class B Common Stock"), with
such Arch Class B Common Stock having the terms set forth in the form of
Certificate of Amendment to Certificate of Incorporation of Arch attached as
Exhibit F to the Merger Agreement (the "Arch Charter Amendment"), for shares of
Existing Arch Common Stock included in the units so purchased on a one-for-one
basis such that on the Effective Date the Standby Class B Holders, in the
aggregate, will beneficially own shares representing not more than 49.0% of the
capital stock of Arch generally entitled to vote in the election of directors
and not more than 49.0% of the total voting power of the capital stock of Arch,
all as provided in the Plan. For purposes of this letter agreement, "beneficial
ownership" shall be determined as provided in Rule 13d-3 and Rule 13d-5
promulgated under the Exchange Act, except that a person or entity shall be
deemed to have "beneficial ownership" of all securities that such person or
entity has the right to acquire, whether such right is exercisable immediately
or only after the passage of time.

            (b)   For purposes of calculating the percentages referred to in
Section 2(a) above, it will be assumed that no additional Unsecured Claims are
allowed after the Effective Date and all of the shares of Existing Arch Common
Stock in the Creditor Stock Pool (as defined in the Plan) are distributed in
accordance with the Plan to the holders of Allowed Unsecured Claims as of the
Effective Date.
<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4


            (c)   Substitution of shares of Class B Common Stock as contemplated
by Section 2(a) above will be effectuated as follows:

                  (i)   first, to the extent that the Standby Purchaser or any
            Other Standby Purchaser beneficially owns shares of Existing Arch
            Common Stock as of the Effective Date, other than those acquired as
            contemplated by the Plan, the Merger Agreement, this letter
            agreement and the Other Standby Purchase Commitments ("Non-Plan Arch
            Shares"), among the Standby Purchaser and such Other Standby
            Purchaser pro rata based on ownership of Non-Plan Arch Shares up to
            an amount equal to the aggregate number of Non-Plan Arch Shares
            beneficially owned by them as of the Effective Date; and

                  (ii)  second, if necessary, among the Standby Purchaser and
            the Other Standby Purchasers in accordance with the percentages set
            forth in Column D of Annex I hereto.

            (d)   The Standby Purchaser hereby disclaims beneficial ownership of
any securities of Arch owned by the Other Standby Purchasers.

      3.    Certain Transfer Restrictions. (a) Subject to Section 12 below, the
Standby Purchaser may (i) sell or otherwise transfer any or all of (A) the
Rights distributed to it in accordance with the Plan or (B) Unsecured Claims in
respect of which Rights are to be distributed or (ii) purchase or otherwise
acquire (A) Rights distributed to others in accordance with the Plan or (B)
Unsecured Claims in respect of which Rights are to be distributed; provided,
however, that, with respect to clause (i) of this sentence, (X)
contemporaneously with the consummation of any such sale or other transfer of
Rights or Unsecured Claims, the Standby Purchaser will notify Arch and
MobileMedia of the occurrence thereof and (Y) the Standby Purchaser will not
consummate any such sale or other transfer unless the transferee or transferees
of such Rights or Unsecured Claims shall have entered into a written agreement
(a "Tracking Agreement") (I) to notify the Standby Purchaser, Arch and
MobileMedia of any subsequent transfer by it of such Rights or Unsecured Claims
or any Rights distributed to it in respect of such Unsecured Claims and (II) not
to sell or otherwise transfer such Rights or Unsecured Claims or Rights
distributed to it in respect of such Unsecured Claims, unless its transferee or
transferees shall agree in writing to be bound in the same manner provided in
this clause (Y) with respect to any subsequent transfer by it.

      (b)   Notwithstanding the provisions of clause (Y) of the proviso in
Section 3(a) above, the Standby Purchaser may elect to sell or otherwise
transfer (i) any or all of the Rights distributed to it in accordance with the
Plan or (ii) Unsecured Claims in respect of which Rights are to be so
distributed, in either case without entering into a Tracking Agreement with its
transferee or transferees (any Rights so transferred and any Rights distributed
in respect of Allowed Claims so transferred, together with any Rights so
transferred and any Rights distributed in respect of Allowed Claims so
transferred by the Other Standby Purchasers pursuant to Section 3(b) of the
Other Standby Purchase Commitments, being
<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5


referred to herein collectively as "Untracked Rights"). Any Rights that remain
unexercised upon expiration thereof will be deemed to be "Section 3(b) Rights"
up to, but not exceeding, the amount of Untracked Rights. The Section 3(b)
Rights shall be exercised as follows prior to the application of Section 1(c)
above and Section 1(c) of the Other Standby Purchase Commitments: (A) the
Standby Purchaser and the Other Standby Purchasers will first be given the
opportunity to purchase for cash (based on the Subscription Price payable upon
exercise of such Rights) units consisting of shares of Arch Common Stock and
Arch Warrants underlying a number of unexercised Rights up to the amount of
Section 3(b) Rights in accordance with the percentages set forth in Column D of
Annex I hereto and (B) to the extent such units are not so purchased, the
Standby Purchaser and any Other Standby Purchasers that are responsible for the
existence of the Section 3(b) Rights will be required to purchase such units pro
rata based on the number of Section 3(b) Rights resulting from their respective
transfers. Nothing in this Section 3(b) will in any way reduce the commitment of
the Standby Purchaser specified in Section 1(c) above or the Unexercised Rights
Commitment Amount as set forth in Annex I hereto.

      4.    The Closing. (a) Notwithstanding anything to the contrary herein
contained or the terms of the Rights or the Plan, subject to the conditions set
forth herein, on the Effective Date the Standby Purchaser, in satisfaction of
the Commitment, will deliver at the Closing (i) the aggregate Subscription Price
payable upon exercise of any Rights exercised by it and (ii) the purchase price
payable in consideration of any shares of Existing Arch Common Stock or, if
applicable, Arch Class B Common Stock and Arch Warrants to be otherwise
purchased by it pursuant to the Commitment; provided, however, that, if
requested by the Standby Purchaser in writing at least two business days prior
to the Effective Date, any cash to be distributed to the Standby Purchaser in
respect of Allowed Secured Claims pursuant to the Plan will, prior to the
distribution thereof pursuant to the Plan and in accordance with the instruction
included in such written request, be first applied, on behalf of the Standby
Purchaser, to the payment of such amounts payable on the Effective Date as
provided in this Section 4(a).

            (b)   Upon payment of the amounts payable as provided in Section
4(a), on the Effective Date at the Closing Arch will deliver to the Standby
Purchaser (or its designees) certificates representing the shares of Existing
Arch Common Stock, shares of Arch Class B Common Stock, if applicable, and the
Arch Warrants, in each case, (i) issuable upon exercise of any Rights exercised
by the Standby Purchaser or (ii) otherwise purchased by the Standby Purchaser
pursuant to the Commitment.

            (c)   Arch will deliver to the Standby Purchaser at least five
business days prior to the Effective Date a written notice which shall (i)
specify the amounts payable at the Closing by it in satisfaction of the
Commitment, (ii) specify the date on which the Effective Date is to occur and
the last date on which the notice referred to in Section 4(d) may to be
delivered, and (iii) indicate the matters required to be addressed in such
notice.
<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6


            (d)   At least two business days prior to the Effective Date, the
Standby Purchaser will deliver to Arch and MobileMedia a written notice which
shall set forth the number of shares of Existing Arch Common Stock beneficially
owned by it as of such date. During the period from the date of such notice
through the Effective Date, neither the Standby Purchaser nor any affiliate
thereof shall acquire beneficial ownership of, or any rights to acquire, any
additional shares of Existing Arch Common Stock or any Unsecured Claim.

      5.    Certain Conditions. The Commitment is subject to the conditions
that:

            (a)   (i) the Confirmation Order (as defined in the Plan), in a form
      reasonably satisfactory to the Standby Purchaser, shall have been entered
      by the Bankruptcy Court (as defined in the Plan) and (ii) such
      Confirmation Order shall have become a Final Order (as defined in Section
      5.1(h) of the Merger Agreement); provided, however, that (A) the Standby
      Purchaser may not assert the condition contained in clause (ii) above if
      each of the Other Standby Purchasers that is not affiliated with the
      Standby Purchaser (each, an "Unaffiliated Standby Purchaser"), acting in
      good faith, shall have waived the condition contained in Section 5(a) of
      the Other Standby Purchase Commitments to which such Unaffiliated Standby
      Purchaser is a party and (B) the Standby Purchaser may not assert the
      condition contained in either clause (i) or clause (ii) above if the sole
      reason for the failure of such condition to be satisfied is the failure or
      the threatened failure of the Standby Purchaser or any of its affiliates
      to fulfill the Commitment;

            (b)   the satisfaction or, with the written consent of the Standby
      Purchaser, waiver of all conditions precedent to the obligations of each
      of the parties to the Merger Agreement contained in the Merger Agreement
      and all conditions precedent to the effectiveness of the Plan contained in
      the Plan; provided, however, that (i) the conditions contained in Section
      5.1(e) and (h), Section 5.2(a), (b), (c), (d) and (e) and Section 5.3(a),
      (b), (c) and (e) of the Merger Agreement (collectively, the "Unilateral
      Conditions") may be waived without the written consent of the Standby
      Purchaser and (ii) the Standby Purchaser may not assert the condition
      contained in this clause (b) if the sole reason for the failure of such
      condition to be satisfied is the failure or the threatened failure of the
      Standby Purchaser or any of its affiliates to fulfill the Commitment;

            (c)   there shall be effective under the Securities Act, a
      registration statement (the "Shelf Registration Statement") covering the
      resale by the Standby Purchaser of (i) all shares of Existing Arch Common
      Stock, all shares of Arch Class B Common Stock, if applicable, and all
      Arch Warrants received by the Standby Purchaser as a result of the
      transactions contemplated by the Plan (including those received upon the
      exercise of Rights and pursuant to this letter agreement) and (ii) all
      shares of Existing Arch Common Stock issuable upon conversion of any such
      shares of the Arch Class B Common Stock or exercise of any such Arch
      Warrants (the securities referred to in the foregoing clauses (i) and (ii)
      are referred to herein as the "Registrable Securities");
<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7


            (d)   Arch shall have executed and delivered to the Standby
      Purchaser a registration rights agreement in the form attached as Exhibit
      C to the Merger Agreement (the "Registration Rights Agreement") granting
      the Standby Purchaser certain demand and piggyback registration rights
      with respect to the Registrable Securities;

            (e)   any and all amendments or modifications to the Merger
      Agreement or any exhibit or schedule thereto (including without limitation
      the Plan, the Arch Charter Amendment, the Arch Warrant Agreement and the
      Registration Rights Agreement) on or after the date hereof and any
      consents or waivers delivered on or after the date hereof by Arch or
      MobileMedia to the other under the Merger Agreement (other than (i)
      subject to Section 15(a) below, consents under Section 4.5 of the Merger
      Agreement or (ii) waivers of Unilateral Conditions) shall have been in
      form and substance reasonably satisfactory to the Standby Purchaser;

            (f)   the representations and warranties of Arch contained in this
      letter agreement shall be true and correct, in all material respects
      (except for the representations and warranties set forth at clauses (a)(v)
      and (a)(vi) of Section 9 below, which shall be true and correct in all
      respects, and except for the representations and warranties set forth at
      clauses (a)(vii) and (viii) of Section 9 below, which shall be disregarded
      for purposes of this clause (f) insofar as they relate to financial
      projections), on the Effective Date, with the same effect as though such
      representations and warranties were made on the Effective Date, and Arch
      shall have performed or complied with, in all material respects, its
      covenants required to be performed or complied with under this letter
      agreement on or prior to the Effective Date (and Arch shall have delivered
      to the Standby Purchaser a certificate to the effect that each of the
      conditions specified in this clause (f) is satisfied in all respects);

            (g)   the representations and warranties of MobileMedia contained in
      this letter agreement shall be true and correct, in all material respects
      (except for the representations and warranties set forth at clauses (b)(v)
      and (b)(vi) of Section 9 below, which shall be true and correct in all
      respects, and except for the representations and warranties set forth at
      clauses (b)(vii) and (viii) of Section 9 below, which shall be disregarded
      for purposes of this clause (f) insofar as they relate to financial
      projections), on the Effective Date, with the same effect as though such
      representations and warranties were made on the Effective Date, and
      MobileMedia shall have performed or complied with, in all material
      respects, its covenants required to be performed or complied with, under
      this letter agreement on or prior to the Effective Date (and MobileMedia
      shall have delivered to the Standby Purchaser a certificate to the effect
      that each of the conditions specified in this clause (g) is satisfied in
      all respects);

            (h)   simultaneously with the transactions contemplated by Section 4
      above, Arch shall have performed its obligation under clause (e) of
      Section 1.3 of the Merger Agreement and any debt financing (other than
      secured bank financing) obtained by Arch to enable it to do so shall have
      terms no less favorable to Arch than those set forth in the Bridge
      Commitment Letter (the
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8


      "Bridge Commitment Letter"); provided, however, that the Standby Purchaser
      may not assert the condition contained in this clause (h) if the sole
      reason for the failure of such condition to be satisfied is the failure or
      threatened failure of the Standby Purchaser or any of its affiliates to
      fulfill the Commitment;

            (i)   simultaneously with the transactions contemplated by Section 4
      above, each of the Other Standby Purchasers shall have fulfilled its
      commitment under the Other Standby Purchase Commitment to which it is a
      party, and, if applicable, any other person having a commitment
      contemplated by Section 13(a) hereof shall have fulfilled such commitment;

            (j)   (i) the shares of Existing Arch Common Stock to be issued and
      distributed as contemplated by Section 1.3(e) and Section 1.6 of the
      Merger Agreement shall be so issued and distributed pursuant to an
      exemption from registration under the Securities Act provided by Section
      1145 of the Bankruptcy Code, and (ii) (A) the issuance of the Rights, (B)
      the issuance of the shares of Existing Arch Common Stock, the shares of
      Arch Class B Common Stock, if applicable, and the Arch Warrants upon
      exercise of the Rights, (C) the issuance to the Standby Purchaser of the
      shares of Existing Arch Common Stock, the shares of Arch Class B Common
      Stock, if applicable, and the Arch Warrants as contemplated by Section 1
      and Section 3 above and the Arch Warrants as contemplated by Section 7
      below, and (D) the issuance of Existing Arch Common Stock upon exercise of
      the Arch Warrants or conversion of Arch Class B Common Stock, if
      applicable, shall be covered by the Registration Statement, the
      Registration Statement shall have been declared effective and no stop
      order with respect thereto shall be in effect;

            (k)   (i) the FCC Grant shall have been issued by the FCC and (ii)
      such FCC Grant shall have become a Final Order (as defined in Section
      5.1(e) of the Merger Agreement); provided, however, that (A) the Standby
      Purchaser may not assert the condition contained in clause (ii) above if
      each of the Unaffiliated Standby Purchasers, acting in good faith, shall
      have waived the condition contained in Section 5(k) of the Other Standby
      Purchase Commitment to which such Unaffiliated Standby Purchaser is a
      party and (B) the Standby Purchaser may not assert the condition contained
      in either clause (i) or clause (ii) above if the sole reason for the
      failure of such condition to be satisfied is an appeal, a motion for
      reconsideration or similar action taken by any present or former officer
      of any Debtor considered or determined by the FCC to be an alleged or
      actual wrongdoer for purposes of the FCC Proceeding;

            (l)   any applicable waiting period under the HSR Act shall have
      expired or been terminated early; and

            (m)   Arch shall have filed with the SEC no later than Friday,
      August 21, 1998 a preliminary Proxy Statement which shall not include any
      information that a reasonable investor would consider important in
      determining whether to make an investment decision regarding a
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9


      purchase of Existing Arch Common Stock and would view its disclosure as
      significantly altering the total mix of information otherwise contained
      therein, which information is not included in the Draft Proxy Statement;
      provided, however, that the Standby Purchaser may not assert the condition
      in this clause (m) unless (i) the information with respect to which the
      Standby Purchaser seeks to assert such condition relates to information
      other than the descriptions of the Merger, the Plan and the other exhibits
      thereto contained in the preliminary Proxy Statement and (ii) such
      condition is asserted by the Standby Purchaser not later than two business
      days after Arch delivers to the Standby Purchaser a copy of the
      preliminary Proxy Statement as filed with the SEC indicating the changes
      therein from the Draft Proxy Statement (which copy Arch will deliver as
      promptly as practicable following filing the same with the SEC).

The Standby Purchaser hereby acknowledges and agrees that (i) the entities with
an asterisk next to their names on Annex I hereto (the "Affiliated Standby
Purchasers") shall be deemed to be affiliated with each other for purposes of
clauses (a) and (k) above and clause (iii) of Section 6 below, and (ii) the
Affiliated Standby Purchasers will act jointly with respect to any decision to
waive the condition contained in any such clause and the corresponding clause
contained in the Other Standby Purchase Commitments to which such Affiliated
Standby Purchasers are parties (with the vote of the Affiliated Standby
Purchasers holding at least 85% of the aggregate amount of Unsecured Claims held
by such Affiliated Standby Purchasers to control with respect to the taking of
any such action).

      6.    Additional Condition. The Commitment is subject to the further
condition that there shall not have occurred between the Buyer Balance Sheet
Date and the Confirmation Date, and, if the Effective Date does not occur within
90 days following the Confirmation Date, between the Buyer Balance Sheet Date
and the Effective Date (i) any event or events (other than events which affect
generally the economy or the industry in which Arch and MobileMedia conduct
their respective businesses) which has had or would have a material adverse
effect on the business, assets (including licenses, franchise and other
intangible assets), financial condition, operating income or prospects
(determined in each case, where applicable, in accordance with generally
accepted accounting principles and in a manner consistent with the past
practices of Arch and MobileMedia) of Arch, MobileMedia and their respective
subsidiaries, taken as a whole (collectively, the "Combined Company") (a
"Combined Company Material Adverse Effect"), (ii) any event or events involving
a regulatory or statutory change and affecting generally the industry in which
Arch and MobileMedia conduct their respective businesses which would materially
and adversely affect the ability of the Combined Company to operate its
business, or (iii) any event or events affecting generally the industry in which
Arch and MobileMedia conduct their respective business which would materially
and adversely affect the ability of the Combined Company to operate its
business; provided, however, that the Standby Purchaser may not assert the
condition contained in this clause (iii) if each of the Unaffiliated Standby
Purchasers, acting in good faith, shall have waived the condition in Section
6(iii) of the Other Standby Purchase Commitment to which such Unaffiliated
Standby Purchaser is a party.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10


      7.    Consideration for the Commitment. In consideration for the
Commitment, on the Effective Date at the Closing the Standby Purchaser will
receive its pro rata share of Arch Warrants entitling the holders thereof to
purchase, in the aggregate, a number of shares of Existing Arch Common Stock
equal to 2.50% of the issued and outstanding shares of Existing Arch Common
Stock and, if applicable, Arch Class B Common Stock, computed on a Fully Diluted
Basis (as defined in the Plan) on the date the "Buyer Market Price" is
determined in accordance with Schedule II to the Merger Agreement giving effect
to the Plan as if the Effective Date had occurred on such date and assuming
21,067,110 shares of Existing Arch Common Stock are issued and outstanding
immediately prior thereto. Such Arch Warrants will be delivered to the Standby
Purchaser and the Other Standby Purchasers, in accordance with the percentages
specified in Column D of Annex I hereto.

      8.    Satisfaction of the Commitment. The Standby Purchaser may, in its
sole discretion, satisfy the Commitment directly and/or indirectly through one
or more of its affiliates, separate accounts within its control or investment
funds under its or its affiliates' management.

      9.    Representations and Warranties. (a) Arch hereby represents and
warrants to the Standby Purchaser that:

                  (i)   Arch is a corporation duly organized, validly existing
            and in good standing under the laws of the State of Delaware and has
            all requisite corporate power and authority to execute, deliver and
            perform its obligations hereunder and to consummate the transactions
            contemplated hereby;

                  (ii)  Subject to the approval of the Buyer Charter Amendment
            and the Buyer Share Issuance by the Stockholders of Arch, the
            execution, delivery and performance of this letter agreement by Arch
            and the consummation by Arch of the transactions contemplated hereby
            have been duly and validly authorized by all necessary corporate
            action on the part of Arch;

                  (iii) This letter agreement constitutes the legal, valid and
            binding obligation of Arch, enforceable against Arch in accordance
            with its terms;

                  (iv)  Subject to entry of the Confirmation Order, and except
            as described in Section 3.3 of the Buyer Disclosure Schedule and
            except for the applicable requirements of the Securities Act, the
            Exchange Act and any applicable state and foreign securities laws,
            the HSR Act, the Communications Act and the regulations of the FCC,
            state public utility, telecommunications or public service laws and
            the Bankruptcy Code, the Confirmation Order and the Amended Plan
            (collectively, the "Applicable Requirements"), the execution,
            delivery and performance of this letter agreement by Arch and the
            consummation by Arch of the transactions contemplated hereby in
            accordance with the terms hereof do not and will not conflict with,
            violate or constitute a
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11


            breach of any material contract, agreement or instrument by which
            Arch is bound or any judgment, order, decree, law, statute, rule,
            regulation or other judicial or governmental restriction to which
            Arch is subject;

                  (v)   Except as described in the Buyer Disclosure Schedule,
            the representations and warranties of Arch contained in the Merger
            Agreement (other than those contained in Sections 3.6, 3.7, 3.26 and
            3.27 thereof), which representations and warranties shall be deemed
            for purposes of this clause (v) not to include any qualification or
            limitation with respect to materiality (whether by reference to
            "Buyer Material Adverse Effect" or otherwise), are true and correct,
            except where the matters in respect of which such representations
            and warranties are not true and correct would not have a Buyer
            Material Adverse Effect;

                  (vi)  True, complete and correct copies of the following
            documents are attached hereto as indicated:


                             Document                            Exhibit Hereto
                             --------                            --------------
      Merger Agreement (including all exhibits                         A
      and schedules thereto)
      
      Buyer Disclosure Schedule                                        B
      
      Other Standby Purchase Commitments                               C
      
      Certificate of Incorporation of Arch, as                         D
      amended through the date hereof
      
      By-laws of Arch, as amended through the                          E
      date hereof
      
      Rights Agreement, dated as of October 13,                        F
      1995, between Arch and the Bank of New
      York, as Rights Agent, as amended
      through the date hereof  (the "Rights
      Agreement")
      
      Draft of the Proxy Statement dated                               G
      August 18, 1998 (the "Draft Proxy
      Statement")
      
      Existing Registration Rights Agreements                          H
      (as defined in Section 9(a)(xi) below),
      
<PAGE>
      
Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 12


                Document                                         Exhibit Hereto
                --------                                         --------------
      Bridge Commitment Letter                                         I

                  (vii)  As of the date hereof, the Draft Proxy Statement
            contains no untrue statement of a material fact or omits to state
            any material fact necessary, in light of the circumstances under
            which it was made, in order to make the statements therein not
            misleading; provided, however, Arch makes no representation with
            respect to either (A) information supplied by MobileMedia for
            inclusion therein or (B) the descriptions of the Merger Agreement,
            the Plan and the other exhibits to the Merger Agreement, and of this
            letter agreement and the Other Standby Purchase Commitments,
            contained therein;

                  (viii) No representation or warranty of Arch contained in this
            letter agreement, and no statement relating to Arch contained in the
            Merger Agreement, the Buyer Disclosure Schedule or any other
            document, certificate or other instrument delivered or to be
            delivered by or on behalf of Arch pursuant to this letter agreement
            (including the definitive Proxy Statement and the Registration
            Statement as declared effective by the SEC), contains or will as of
            the Effective Date contain any untrue statement of a material fact
            or omits or will as of the Effective Date omit to state any material
            fact necessary, in light of the circumstances under which it was or
            will be made, in order to make the statements herein or therein not
            misleading;

                  (ix)   Between the Buyer Balance Sheet Date and the date
            hereof, there has not occurred with respect to Arch (A) any event or
            events (other than events which affect generally the economy or the
            industry in which Arch and MobileMedia conduct their respective
            businesses) which has had or would have a Combined Company Material
            Adverse Effect or (B) any event or events involving a regulatory or
            statutory change and affecting generally the industry in which Arch
            and MobileMedia conduct their respective business which would
            materially and adversely affect the ability of the Combined Company
            to operate its business;

                  (x)    The shares of Existing Arch Common Stock to be issued
            and distributed as contemplated by Section 1.3(e) and Section 1.6 of
            the Merger Agreement and the shares of Existing Arch Common Stock,
            the shares of Arch Class B Common Stock, if applicable, and the Arch
            Warrants to be issued and delivered as contemplated by Section 1 and
            Section 3 above, and the Arch Warrants to be issued as contemplated
            by Section 7 above, in each case when so issued and distributed or
            delivered, as the case may be, and the shares of Existing Arch
            Common Stock issued upon conversion of such shares of Arch Class B
            Common Stock, if applicable, when so converted in accordance with
            the Arch Charter Amendment, and the shares of Existing Arch Common
            Stock issued upon
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 13


            exercise of such Arch Warrants, when issued, paid for and delivered
            as provided in the Arch Warrant Agreement, will be duly authorized,
            validly issued, fully paid, nonassessable and free of all preemptive
            rights; and

                  (xi)  Schedule 9(a)(xi) hereto sets forth a true, complete and
            correct list of all agreements that are in effect as of the date
            hereof pursuant to which the Company has granted any registration
            rights to any person or entity (the "Existing Registration Rights
            Agreements"), and, except as specified in Schedule 9(a)(xi) hereto,
            none of the Existing Registration Rights Agreements is inconsistent
            with the rights to be granted to the Standby Purchaser pursuant to
            the Registration Rights Agreement.

            (b)   MobileMedia hereby represents and warrants to the Standby
            Purchaser that:

                  (i)   MobileMedia is a corporation duly organized, validly
            existing and in good standing under the laws of the State of
            Delaware and, subject to the entry of the Confirmation Order, has
            all requisite corporate power and authority to execute, deliver and
            perform its obligations hereunder and to consummate the transactions
            contemplated hereby;

                  (ii)  Subject to the entry of the Confirmation Order, the
            execution, delivery and performance of this letter agreement by
            MobileMedia and the consummation by MobileMedia of the transactions
            contemplated hereby have been duly and validly authorized by all
            necessary corporate action on the part of MobileMedia;

                  (iii) Subject to the entry of the Confirmation Order and the
            effectiveness of the Plan, this letter agreement constitutes the
            legal, valid and binding obligation of MobileMedia, enforceable
            against MobileMedia in accordance with its terms;

                  (iv)  Subject to entry of the Confirmation Order, and except
            as described in Section 2.3 of the Company Disclosure Schedule and
            except for the Applicable Requirements, the execution, delivery and
            performance of this letter agreement by MobileMedia and the
            consummation by MobileMedia of the transactions contemplated hereby
            in accordance with the terms hereof do not and will not conflict
            with, violate, or constitute a breach of any material contract,
            agreement or instrument by which MobileMedia is bound or any
            judgment, order, decree, law, statute, rule, regulation or other
            judicial or governmental restriction to which MobileMedia is
            subject;

                  (v)   Except as described in the Company Disclosure Schedule,
            the representations and warranties of MobileMedia contained in the
            Merger Agreement (other than those contained in Sections 2.6, 2.7,
            2.23 and 2.24 thereof), which representations and warranties shall
            be deemed for purposes of this clause (v) not to
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 14


            include any qualification or limitation with respect to materiality
            (whether by reference to "Company Material Adverse Effect" or
            otherwise), are true and correct, except where the matters in
            respect of which such representations and warranties are not true
            and correct would not have a Company Material Adverse Effect;

                  (vi)   True, complete and correct copies of the following
            documents are attached hereto as indicated:


                             Document                            Exhibit Hereto
                             --------                            --------------
            Merger Agreement (including all exhibits                   A
            and schedules thereto)
      
            Other Standby Purchase Commitments                         C
      
            Company Disclosure Schedule                                J
      
            Agreement, dated the date hereof (the                      K
            "Debtor/Committee Agreement"), between
            MobileMedia, on behalf of itself and the
            other Debtors, and the Committee (as
            defined in the Plan)

                  (vii)  As of the date hereof, the information included in the
            Draft Proxy Statement that was provided for inclusion therein by
            MobileMedia contains no untrue statement of a material fact or omits
            to state any material fact necessary, in light of the circumstances
            under which it was made, in order to make the statements therein not
            misleading;

                  (viii) No representation or warranty of MobileMedia contained
            in this letter agreement, and no statement relating to MobileMedia
            contained in the Merger Agreement, the Company Disclosure Schedule
            or any other document, certificate, or other instrument delivered or
            to be delivered by or on behalf of MobileMedia pursuant to this
            letter agreement, contains or will as of the Effective Date contain
            any untrue statement of a material fact or omits or will as of the
            Effective Date omit to state any material fact necessary, in light
            of the circumstances under which it was or will be made, in order to
            make the statements herein or therein not misleading; and

                  (ix)   Between the Company Balance Sheet Date and the date
            hereof, there has not occurred with respect to MobileMedia (A) any
            event or events (other than events which affect generally the
            economy or the industry in which Arch and MobileMedia
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 15


            conduct their respective businesses) which has had or would have a
            Combined Company Material Adverse Effect or (B) any event or events
            involving a regulatory or statutory change and affecting generally
            the industry in which Arch and MobileMedia conduct their respective
            businesses which would materially and adversely affect the ability
            of the Combined Company to operate its business.

            (c)   The Standby Purchaser hereby represents and warrants to each
of Arch and MobileMedia that:

                  (i)   The Standby Purchaser is a corporation duly organized,
            validly existing and in good standing under the laws of the
            Commonwealth of Massachusetts and has all requisite corporate power
            and authority to execute, deliver and perform its obligations
            hereunder and to consummate the transactions contemplated hereby;

                  (ii)  The execution, delivery and performance of this letter
            agreement by the Standby Purchaser and the consummation by the
            Standby Purchaser of the transactions contemplated hereby have been
            duly and validly authorized by all necessary corporate action on the
            part of the Standby Purchaser;

                  (iii) This letter agreement constitutes the legal, valid and
            binding obligation of the Standby Purchaser, enforceable against the
            Standby Purchaser in accordance with its terms;

                  (iv)  Except for the Applicable Requirements, the execution,
            delivery and performance of this letter agreement by the Standby
            Purchaser and the consummation by the Standby Purchaser of the
            transactions contemplated hereby in accordance with the terms hereof
            do not and will not conflict with, violate or constitute a breach of
            any material contract, agreement, or instrument by which the Standby
            Purchaser is bound or any judgment, order, decree, law, statute,
            rule, regulation or other judicial or governmental restriction to
            which the Standby Purchaser is subject, except where such conflicts,
            violations or breaches, individually or in the aggregate, would not
            have a material adverse effect on the ability of the Standby
            Purchaser to consummate the transactions contemplated hereby;

                  (v)   No representation or warranty of the Standby Purchaser
            contained in this letter agreement, and no statement contained in
            any other document, certificate or other instrument delivered or to
            be delivered by or on behalf of the Standby Purchaser pursuant to
            this letter agreement, contains or will as of the Effective Date
            contain any untrue statement of a material fact or omits or will as
            of the Effective Date omit to state any material fact necessary, in
            light of the circumstances under which it was or will be made, in
            order to make the statements herein or therein not misleading; and
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 16


                  (vi)  As of the date hereof, the Standby Purchaser holds
            directly, or indirectly through its affiliates, separate accounts
            within its control or investment funds under its or its affiliates'
            management, the aggregate stated principal amount of 9 3/8% Notes
            and 10 1/2% Notes (as such terms are defined in the Plan) indicated
            under the Standby Purchaser's name and address on Annex I hereto.

            (d)   None of the representations and warranties made herein or in
any certificate to be delivered as contemplated hereby will survive the Closing.

      10.   Certain Covenants. (a) Each of Arch and MobileMedia (i) acknowledges
that the Debtors have agreed to provide to the Committee copies of any and all
notices, documents or information to be provided by or made available by the
Debtors to Arch pursuant to the Merger Agreement or provided by or made
available by Arch to the Debtors pursuant to the Merger Agreement, promptly
after the receipt or provision thereof by or to the Debtors, as applicable, and
that the Committee, pursuant to the undertaking attached as Annex II hereto, has
agreed to distribute copies of the same to the Standby Purchaser and to take
certain other actions and (ii) agrees that the Committee may do so.

            (b)   Without limiting the generality of the foregoing clause (a) of
this Section 10, Arch will, before filing the Registration Statement with the
SEC, furnish to the Standby Purchaser and its counsel copies of the Registration
Statement (including all exhibits thereto) proposed to be filed, will provide
the Standby Purchaser and its counsel a reasonable opportunity to review and
comment on such Registration Statement and will not file such Registration
Statement if the Standby Purchaser shall reasonably object thereto within three
calendar days after the receipt thereof.

            (c)   Arch will deliver to the Standby Purchaser copies of the
definitive Proxy Statement in the form filed with the SEC and mailed to
Stockholders of Arch and the Registration Statement in the form declared
effective by the SEC.

            (d)   Without limiting the generality of the foregoing clause (a) of
this Section 10, Arch will, before filing the Shelf Registration Statement or
any pre-effective amendment thereto, furnish to the Standby Purchaser and its
counsel copies of the Shelf Registration Statement or such pre-effective
amendment thereto, as applicable, proposed to be filed, will provide Standby
Purchaser and its counsel with a reasonable opportunity to review and comment on
the Shelf Registration Statement or such pre-effective amendment thereto, as
applicable, and will not file the Shelf Registration Statement or such
pre-effective amendment thereto, as applicable, to which the Standby Purchaser
or its counsel shall reasonably object within three business days after the
receipt thereof. The Standby Purchaser will furnish to Arch such information
regarding the Standby Purchaser and its plan and method of distribution of the
Registrable Securities as Arch may reasonably request in writing in connection
with the preparation of the Shelf Registration Statement.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 17


            (e)   Each of Arch, MobileMedia and the Standby Purchaser will use
its reasonable best efforts to obtain all approvals, waivers, consents and other
authorizations required by the Applicable Requirements, including without
limitation the applicable requirement of the HSR Act, necessary in connection
with the performance of this letter agreement by the Standby Purchaser and the
consummation by the Standby Purchaser of the transactions contemplated hereby.

            (f)   Arch will, as requested by the Standby Purchaser, either pay
directly to the appropriate Governmental Entity, on behalf of the Standby
Purchaser, or reimburse the Standby Purchaser for, any fees required to be paid
by the Standby Purchaser in connection with its compliance with the applicable
requirements of the HSR Act. In addition, following the Effective Date, Arch
will reimburse, promptly upon written request (accompanied by appropriate
supporting documentation), costs and expenses (including without limitation
reasonable fees and expenses of legal counsel, including a reasonable allocation
with respect to the cost of any internal counsel), not to exceed $100,000,
incurred by the Standby Purchaser in connection with this letter agreement and
the transactions contemplated hereby.

      11.   Certain Prohibited Transactions. The Standby Purchaser hereby
covenants that, from and after the date hereof, so long as its commitment
hereunder remains in effect, it will not sell, or enter into any agreement
relating to the sale (including without limitation any short sale, equity swap
or other hedge position) of, any shares of Arch capital stock or, except as
otherwise expressly contemplated by this Section 11, engage in any other
disposition of such shares that might negatively affect the market price of such
shares; provided, however, that the foregoing provision will not apply to any
agreement entered into prior to the date hereof (if not entered into in
contemplation of the transactions contemplated by the Plan, the Merger Agreement
or this letter agreement) or any transaction effected pursuant to the terms
thereof. Notwithstanding the immediately preceding sentence, but subject to
Section 3 above and Section 12 below, the Standby Purchaser may at any time, as
it may determine in its sole and absolute discretion, sell or otherwise
transfer, or acquire, or enter into any agreement relating to the sale, transfer
or acquisition of, Rights or Unsecured Claims. The Standby Purchaser
acknowledges that it has received copies of the Rights Agreement and the
amendment thereto attached as Exhibit D to the Merger Agreement (the "Rights
Plan Amendment"). Arch hereby covenants that it will not, without the prior
written consent of the Standby Purchaser, further amend the Rights Agreement in
any manner that would eliminate or reduce the ownership thresholds applicable to
the Standby Purchaser thereunder; provided, however, that this sentence shall
cease to be of any further force or effect at such time after the Effective Date
as the Standby Purchaser ceases to beneficially own in the aggregate at least
10.0% of the outstanding shares of Existing Arch Common Stock.

      12.   Voting Agreement. The Standby Purchaser hereby covenants that (a) so
long as the Bankruptcy Court approves the Disclosure Statement not later than
December 31, 1998 and the Confirmation Order is entered not later than March 31,
1999, (i) it will vote, or cause to be voted, for the acceptance of the Plan all
Unsecured Claims held by it on the date fixed for determining holders of
Unsecured Claims entitled to vote for acceptance or rejection of the Plan (the
"Record Date"), (ii) it will
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 18


not withdraw or otherwise revoke, or cause to be withdrawn or otherwise revoked,
such vote for the acceptance of the Plan, and (iii) it will not grant, or cause
to be granted, to any other person or entity any proxy to vote with respect to
any such Unsecured Claims (other than a proxy to vote for the acceptance of the
Plan) and (b) except with respect to accounts which cease to be within the
Standby Purchaser's control and investment funds which cease to be under its
management, it will not, on or prior to the Record Date, sell or otherwise
transfer any Unsecured Claims held by it unless the transferee shall have agreed
in writing in the form attached as Annex III hereto (i) to vote for the
acceptance of the Plan with respect to such Unsecured Claims and (ii) not to
sell or otherwise transfer such Unsecured Claims unless its transferee shall
agree to be bound in the same manner provided in this clause (b) with respect to
such Unsecured Claims.

      13.   Other Standby Purchase Commitments. (a) Each of Arch and MobileMedia
covenants that it will not agree to any amendment or modification to any of the
letter agreements, dated the date hereof, among Arch, MobileMedia and any of the
Other Standby Purchasers (the "Other Standby Purchase Commitments"), without the
prior written consent of the Standby Purchaser. Notwithstanding the immediately
preceding sentence, Arch and MobileMedia may, without the prior written consent
of the Standby Purchaser, agree to an amendment or modification to any of the
Other Standby Purchase Commitments to the extent that (i) such amendment or
modification has the sole effect of reducing or eliminating the financial
commitment thereunder and (ii) simultaneously therewith, a qualified
institutional buyer (as such term is defined in Rule 144A promulgated under the
Securities Act) reasonably acceptable to the Standby Purchaser makes a
commitment in a corresponding amount on terms identical in all material respects
to those set forth in such Other Standby Purchase Commitment.

            (b)   The Standby Purchaser will have no liability for the
commitment of any Other Standby Purchaser under any Other Standby Purchase
Commitments or the commitment of any other person contemplated by Section 13(a)
above.

      14.   Certain Notices; Certain Information. (a) Each of Arch and
MobileMedia hereby covenants that it will promptly deliver to the Standby
Purchaser, and the Standby Purchaser hereby covenants that it will promptly
deliver to Arch and MobileMedia, written notice of any matter, event or
development that would (i) render any representation or warranty made by it
herein inaccurate or incomplete in any respect or (ii) constitute or result in a
breach by it of, or a failure by it to comply with, any covenant herein
applicable to it.

            (b)   Each of Arch and MobileMedia will furnish the Standby
Purchaser with such information regarding itself as the Standby Purchaser may
reasonably request.

      15.   Certain Consent Rights. (a) Notwithstanding anything to the contrary
herein contained, except as expressly contemplated by the Merger Agreement or
the Plan, Arch hereby covenants that it will not take, or agree in writing to
take, any action contemplated by Section 4.5(b)(ii),
<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 19


(iii), (iv), (viii) or (ix) of the Merger Agreement without the prior written
consent of the Standby Purchaser.

            (b)   Arch hereby covenants that, without the prior written consent
of the Standby Purchaser, it will not, prior to the Effective Date, enter into
any agreement with respect to its securities, or amend any existing agreement
with respect to its securities (including without limitation the Existing
Registration Rights Agreements) in any manner inconsistent with the rights to be
granted to the Standby Purchaser pursuant to the Registration Rights Agreement.

      16.   Removal of Legends. In the event that, following the transactions
contemplated by the Merger Agreement, the Plan and this letter agreement, any
certificates evidencing securities ("Certificates") of Arch held by the Standby
Purchaser bear a restrictive legend then:

            (a)   if the Standby Purchaser delivers to Arch (i) a certificate,
      in a form reasonably satisfactory to Arch, certifying that securities
      evidenced by such Certificate have been transferred pursuant to a
      registration statement that is effective under the Securities Act or (ii)
      a certificate, in a form reasonably satisfactory to Arch, certifying that
      securities evidenced by such Certificate have been transferred without
      registration in accordance with the requirements of Rule 144 under the
      Securities Act, Arch will, or will instruct its transfer agent to, issue
      upon surrender of such Certificate one or more new Certificates evidencing
      the securities so transferred evidenced by the Certificate so surrendered,
      which new Certificate or Certificates will not bear any such legend; and

            (b)   if the Standby Purchaser delivers to Arch an opinion of
      counsel to the Standby Purchaser (which may be internal counsel to the
      Standby Purchaser) that, in the opinion of such counsel, such legend is
      not, or is no longer, required to ensure compliance with the Securities
      Act, Arch will, or will instruct its transfer agent to, issue upon
      surrender of such Certificate one or more new Certificates evidencing the
      securities evidenced by the Certificate so surrendered, which new
      Certificate or Certificates will not bear any such legend.

                                    * * * * *

      If you are in agreement with the foregoing, please execute the enclosed
copy of this letter agreement as indicated and return it to the undersigned.
This letter agreement will become effective upon (i) the delivery to us of
executed counterparts of this letter agreement by each of you and (ii) the
execution and delivery of each of the Other Standby Purchase Commitments by each
of the parties
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 20

thereto. Once effective, this letter agreement will terminate on (i) the date on
which the Debtor Tower Agreement is terminated, unless prior to or
simultaneously with such termination, MobileMedia shall have entered into a
definitive agreement (which shall be comparable in form and substance to the
Debtor Tower Agreement and a copy of which shall be delivered to the Standby
Purchaser promptly following the execution thereof) with a bona fide third-party
purchaser providing for a sale to such third party of the assets or
substantially all of the assets to be sold to Pinnacle pursuant to the Debtor
Tower Agreement resulting in net proceeds to MobileMedia of not less than $165.0
million (an "Acceptable Sale"), (ii) December 31, 1998, unless the Closing (as
defined in the Debtor Tower Agreement) or the closing of an Acceptable Sale
shall have occurred on or before such date, (iii) March 31, 1999, unless the
Confirmation Order shall have been entered by the Bankruptcy Court on or before
such date, (iv) June 30, 1999, unless the effectiveness of the Plan occurs on or
before such date, or (v) if not theretofore terminated pursuant to one of the
foregoing clauses, the date on which the Merger Agreement is terminated in
accordance with the terms thereof.

      All notices and other communications hereunder must be in writing. Any
notice or other communication hereunder will be deemed duly delivered three
business days after it is sent by registered or certified mail, return receipt
requested, postage prepaid, or two business days after it is sent via a
reputable international overnight courier service, in each case to the intended
recipient at the address therefor set forth on the signature page hereto. Any
party hereto may give any notice or other communication hereunder by personal
delivery or telecopy, but no such notice or other communication will be deemed
to have been duly given unless and until it actually is received by the party
for whom it is intended. Any party may change the address to which notices and
other communications hereunder are to be delivered by giving the other parties
notice in the manner herein set forth.

      This letter agreement represents the final agreement among the parties
hereto with respect to the subject matter hereof and may not be contradicted by
evidence of prior or contemporaneous agreements of the parties. There are no
unwritten oral agreements between the parties relating to the subject matter
hereof. This letter agreement may not be amended or modified except by a written
instrument signed by each of the Standby Purchaser, Arch and MobileMedia.

      This letter agreement shall be governed by and construed in accordance
with the laws of the State of Delaware without regard to its principles of
conflicts of law.
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 21


      This letter agreement may be executed in counterparts which, taken
together, shall constitute one and the same instrument.

                                    Very truly yours,                          
                                    
                                    Credit Suisse First Boston Corporation
                                    
                                    
                                    By:
                                       -----------------------------------------
                                    
                                    Name:
                                         ---------------------------------------
                                    
                                    Its:
                                        ----------------------------------------
                                    
                                    Address:       11 Madison Avenue
                                                   New York, New York 10010
                                                   Attn: David J. Matlin
                                                         Alex Lagetko
                                    
                                    With copy to:  Cadwalader, Wickersham & Taft
                                                   100 Maiden Lane
                                                   New York, New York 10038
                                                   Attn: Michael J. Sage
                                    
ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.


By:
   --------------------------------------

Name:
     ------------------------------------

Its:
    -------------------------------------

Address:  1800 West Park Drive, Suite 250
          Westborough, MA  01581
          Attn:  Chairman and Chief
                 Executive Officer
<PAGE>

Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 22

With copy to: Hale and Dorr LLP
              60 State Street
              Boston, MA  02109
              Attn:  Jay E. Bothwick


Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.


By:
   --------------------------------------

Name:
     ------------------------------------

Its:
    -------------------------------------

Address: Fort Lee Executive Park
         One Executive Drive, Suite 500
         Fort Lee, NJ  07024
         Attn:  Chairman - Restructuring

With copy to: Sidley & Austin
              875 Third Avenue, Suite 1400
              New York, New York 10022
              Attn: James D. Johnson
<PAGE>

                                                                         ANNEX I
                                                                         -------

                               COMMITMENT AMOUNTS
                               ------------------
                              (dollars in millions)
<TABLE>
<CAPTION>

                                                       Column A                Column B               Column C           Column D
                                                       --------                --------               --------           --------

                                                    Rights Exercise       Unexercised Rights            Total
                                                      Commitment              Commitment             Commitment         Commitment
Name and Address of Standby Purchasers                Amount (1)              Amount (2)               Amount           Percentage
- --------------------------------------               ------------            ------------             --------         -----------
<S>                                                     <C>                     <C>                    <C>                 <C>   
W.R. Huff Asset Management Co., L.L.C., as              $39.27                  $35.80                 $75.07              34.60%
   agent for its affiliates and discretionary                                                        
   accounts                                                                                          
67 Park Place, 9th Floor                                                                             
Morristown, New Jersey  07960                                                                        
Stated Principal Amount of 9 3/8% Notes:                                                             
$ 57,847,000                                                                                         
Stated Principal Amount of 10 1/2% Notes:                                                            
$ 27,970,000                                                                                         
                                                                                                     
The Northwestern Mutual Life Insurance                  $10.95                   $9.97                 $20.92               9.64%
   Company*                                                                                          
720 East Wisconsin Avenue                                                                            
Milwaukee, Wisconsin  53202                                                                          
Stated Principal Amount of 9 3/8% Notes:                                                             
$ 19,776,000                                                                                         
Stated Principal Amount of 10 1/2% Notes:                                                            
$  3,350,000                                                                                         
                                                                                                     
The Northwestern Mutual Life Insurance                   $2.65                   $2.42                  $5.07               2.34%
   Company for its Group Annuity Separate                                                        
   Account*
720 East Wisconsin Avenue
Milwaukee, Wisconsin  53202
Stated Principal Amount of 9 3/8% Notes:
$     -0-
Stated Principal Amount of 10 1/2% Notes
$  7,000,000
</TABLE>


- ----------

* The Northwestern Mutual Life Insurance Company, The Northwestern Mutual Life
Insurance Company for its Group Annuity Separate Account and Northwestern Mutual
Series Fund, Inc. for the High Yield Bond Portfolio are affiliated entities for
purposes of clauses (a) and (k) of Section 5 and clause (iii) of Section 6.
<PAGE>

                               COMMITMENT AMOUNTS
                               ------------------
                              (dollars in millions)
<TABLE>
<CAPTION>
                                                       Column A                Column B               Column C           Column D
                                                       --------                --------               --------           --------

                                                    Rights Exercise       Unexercised Rights            Total
                                                      Commitment              Commitment             Commitment         Commitment
Name and Address of Standby Purchasers                Amount (1)              Amount (2)               Amount           Percentage
- --------------------------------------               ------------            ------------             --------         -----------
<S>                                                    <C>                      <C>                    <C>                <C>    
Northwestern Mutual Series Fund, Inc. for the             $.75                    $.69                   $1.44             0.66%
   High Yield Bond Portfolio*                                                                           
720 East Wisconsin Avenue                                                                               
Milwaukee, Wisconsin  53202                                                                             
Stated Principal Amount of 9 3/8% Notes:                                                                
$     -0-                                                                                               
Stated Principal Amount of 10 1/2% Notes:                                                               
$  2,000,000                                                                                            
                                                                                                        
Credit Suisse First Boston Corporation                  $29.48                  $26.88                  $56.36            25.97%
11 Madison Avenue, 4th Floor                                                                            
New York, New York 10010                                                                                
Stated Principal Amount of 9 3/8% Notes:                                                                
$ 32,453,000                                                                                            
Stated Principal Amount of 10 1/2% Notes:                                                               
$ 35,930,000                                                                                            
                                                                                                        
Whippoorwill Associates, Inc., as general partner       $30.42                  $27.72                  $58.14            26.79%
   and/or agent for the parties set forth on                                                           
   Schedule A hereto in the percentages noted                                                         
   thereon                                                                                            
11 Martine Avenue                                                                                     
White Plains, New York 10606                                                                          
Stated Principal Amount of 9 3/8% Notes:                                                              
$ 37,855,000                                                                                          
Stated Principal Amount of 10 1/2% Notes:                                                             
$ 31,410,000                                                                                          
                                               Total:  $113.52                  $103.48                $217.00            100.00%
                                                       -------                  -------                -------
</TABLE>

- ----------

(1)   The "Rights Exercise Commitment Amount", for each Standby Purchaser, shall
      mean an amount equal to the product of (i) the Rights Subscription Price
      (as defined in Schedule II to the Merger Agreement) and (ii) the number of
      Rights issuable in respect of an amount of Allowed Unsecured Claims
      derived from the principal amount of 9 3/8% Notes and the 10 1/2% Notes
      indicated under the Standby Purchaser's name on this Annex I held by such
      Standby Purchaser on the date hereof. The dollar amounts set forth under
      Column A are estimates provided for illustrative purposes only, based on
      the assumptions that (x) there is a total of $475 million of Allowed
      Unsecured Claims, (y) there is no Rights Reserve (as defined in the Plan),
      and (z) the aggregate amount of Subordinated Noteholder Claims (as defined
      in the Plan) is $441,819,762.

(2)   The "Unexercised Rights Commitment Amount", for each Standby Purchaser,
      shall mean an amount equal to (i) the Total Commitment Amount indicated in
      Column C for such Standby Purchaser less (ii) the Rights Exercise
      Commitment Amount for such Standby Purchaser. The dollar amounts set forth
      under Column B are estimates provided for illustrative purposes only,
      based on the estimates set forth in Column A.
<PAGE>

                                                                        ANNEX II
                                                                        --------


                                   UNDERTAKING
                                   -----------

            The Committee hereby undertakes to distribute to the Standby
Purchaser (until instructed by the Standby Purchaser to do otherwise) copies of
any and all notices, documents or information to be provided by or made
available by the Debtors to Arch pursuant to the Merger Agreement or provided by
or made available by Arch to the Debtors pursuant to the Merger Agreement that
are received by the Committee pursuant to the Debtor/Committee Agreement as soon
as practicable with its receipt thereof. The Committee hereby further undertakes
to consult with the Standby Purchaser (until instructed by the Standby Purchaser
to do otherwise) prior to delivering any written consent or exercising any other
right of the Committee (other than the distribution of notices, documents or
information to the Standby Purchaser or the Other Standby Purchasers) pursuant
to the Debtor/Committee Agreement or the Plan. The Committee will not enter into
any amendment to the Debtor/Committee Agreement without the prior written
consent of the Standby Purchaser.

                                       THE OFFICIAL COMMITTEE
                                       OF UNSECURED CREDITORS


                                       By:
                                           -------------------------------------
                                       Its:
                                           -------------------------------------
<PAGE>

                                                                       ANNEX III
                                                                       ---------

                                VOTING AGREEMENT
                                ----------------

      The undersigned transferee of indebtedness of MobileMedia Corporation or
one of its direct or indirect subsidiaries (collectively, "MobileMedia")
described in Schedule A attached hereto (the "Claim"), hereby acknowledges and
agrees as follows:

      1.    MobileMedia is a debtor-in-possession under Chapter 11 of the
            Bankruptcy Code and has proposed a First Amended Joint Plan of
            Reorganization dated August __, 1998 (the "Amended Plan").

      2.    By acquiring the Claim the undersigned may also acquire rights to
            vote on the adoption of the Amended Plan.

      3.    As a condition of the transfer of the Claim, the undersigned hereby
            agrees to exercise all voting rights it may have as holder of the
            Claim in favor of the Amended Plan unless the Amended Plan shall
            have been withdrawn.

      4.    The undersigned agrees that it shall not subsequently transfer the
            Claim or any portion thereof unless and until it obtains from its
            transferee a Voting Agreement identical to the form hereof.

            IN WITNESS HEREOF, the undersigned transferee has executed this
Voting Agreement this _____ day of __________, 199_.

                                           [TRANSFEREE]


                                           By:
                                              -------------------------------
                                              Title:


Accepted By:


- -------------------------
[Transferor]
<PAGE>

                                   SCHEDULE A
                                       TO
                                VOTING AGREEMENT

[Describe claim.]
<PAGE>

                                                               SCHEDULE 9(a)(xi)
                                                               -----------------

Existing Registration Rights Agreement
- --------------------------------------

(1)   Registration Rights Agreement, dated as of June 24, 1998, by and among
      Arch Communications Group, Inc., Sandler Capital Partner, 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, as amended

(2)   Registration Rights Agreement, dated as of June 29, 1998, Arch
      Communications Group, Inc. Adelphia Communications Corporation and
      Lisa-Gaye Shearing

Inconsistencies:
- ----------------

The provisions of the Registration Rights Agreement listed at (2) above are
inconsistent in certain respects with the provisions of the Registration Rights
Agreement.



                                                                    Exhibit 99.2

                 FIRST AMENDMENT TO AGREEMENT AND PLAN OF MERGER

           This First Amendment, dated as of September 3, 1998 (this "First
Amendment"), to the Agreement and Plan of Merger, dated as of August 18, 1998
(the "Merger Agreement"), by and among Arch Communications Group, Inc. (the
"Buyer"), Farm Team Corp. (the "Merger Subsidiary"), MobileMedia Corporation
(the "Parent") and MobileMedia Communications, Inc. (the "Company"). Terms used
herein with initial capital letters that are not otherwise defined shall have
the meanings ascribed to such terms in the Merger Agreement.

                              PRELIMINARY STATEMENT

           A. The Buyer, the Merger Subsidiary, the Parent and the Company have
entered into the Merger Agreement.

           B. The Buyer, the Merger Subsidiary, the Parent and the Company
desire to amend the Merger Agreement as set forth herein.

           NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Parties hereby agree as
follows:

           1. Recital C. Recital C of the Merger Agreement is hereby amended to
delete the reference to "Debtor's First Amended Joint Plan of Reorganization"
and replace such reference with a reference to "Debtor's Second Amended Joint
Plan of Reorganization."

           2. Recital E. Recital E of the Merger Agreement is hereby amended to
read in its entirety as follows:

           E. In connection with the Merger (as defined in Section 1.1) and as
           part of the Amended Plan, the Buyer intends to conduct the Rights
           Offering (as defined in Section 4.20), in which it will issue to
           holders of certain Allowed Claims transferable Rights to purchase (i)
           if a Rights Offering Adjustment (as defined in Schedule II attached
           hereto) shall not have occurred, units consisting of (a) shares of
           Common Stock, $0.01 par value per share, of the Buyer ("Buyer Common
           Stock") or shares of Buyer Class B Common Stock, if applicable, and
           (b) warrants to purchase shares of Buyer Common Stock ("Buyer
           Warrants"), such Buyer Warrants to be issued pursuant to a warrant
           agreement in the form attached hereto as Exhibit B (the "Buyer
           Warrant Agreement"), or (ii) if a Rights Offering Adjustment shall
           have occurred, shares of Buyer Common Stock or shares of Buyer Class
           B Common Stock, if applicable. Contemporaneously with the execution
           and delivery of this Agreement, certain holders of Allowed Claims
           (the "Standby Purchasers") are making certain commitments in
           connection with the Rights Offering (as the same may be amended from
           time to time, the "Standby Purchase Commitments"), copies of which
           are attached as

                                      - 1 -
<PAGE>

           Exhibits G, H, I, J, K and L hereto. In partial consideration for the
           Standby Purchase Commitments, the Buyer will issue to the Standby
           Purchasers (x) if a Rights Offering Adjustment shall not have
           occurred, Buyer Warrants or (y) if a Rights Offering Adjustment shall
           have occurred, warrants to purchase shares of Buyer Common Stock
           ("Buyer Participation Warrants"), such Buyer Participation Warrants
           to be issued pursuant to a warrant agreement in the form attached
           hereto as Exhibit B-1 (the "Buyer Participation Warrant Agreement"),
           as provided in the Standby Purchase Commitments. In addition, in
           connection with the Standby Purchase Commitments, the Buyer and the
           Standby Purchasers will enter into a registration rights agreement in
           the form attached hereto as Exhibit C (as the same may be amended
           from time to time, the "Registration Rights Agreement").

           3. Recital F. Recital F of the Merger Agreement is hereby amended to
read in its entirety as follows:

           F. If a Rights Offering Adjustment shall not have occurred,
           immediately following the Merger, the Buyer will issue Buyer Warrants
           to the stockholders of the Buyer that were holders of record
           immediately prior to such Merger. The Buyer will conduct the
           Stockholder Rights Offering (as defined in Section 4.22), in which it
           will issue to holders of Buyer Stock (as defined in Section 1.7) as
           of a record date to be determined by the Board of Directors of the
           Buyer (the "Buyer Record Date"), such holders being referred to
           herein as the "Stockholder Rights Holders", non-transferable rights
           ("Stockholder Rights") (except that, at the Buyer's election, the
           Stockholder Rights will transfer with the underlying shares in
           respect of which the Stockholder Rights are distributed) to acquire
           shares of Buyer Common Stock if a Rights Offering Adjustment shall
           have occurred. In connection therewith, if a Rights Offering
           Adjustment shall have occurred, immediately following the Merger, the
           Buyer will issue to the stockholders of the Buyer one Buyer
           Participation Warrant for each Stockholder Right issued to such
           Stockholder Rights Holder that was not exercised.

           4. Section 1.2. Section 1.2 of the Merger Agreement is here amended
to add the following at the end thereof:

           Notwithstanding anything contained herein to the contrary, in no
           event will the Closing be earlier than twelve business days after the
           Buyer delivers to the Standby Purchasers the written notice required
           pursuant to Section 4(c)(i) of the Standby Purchase Commitments.

           5. Section 1.3. Section 1.3 of the Merger Agreement is hereby amended
to read in its entirety as follows:

           1.3 Actions at the Closing. At the Closing, (a) the Parent and the
           Company shall deliver to the Buyer and the Merger Subsidiary the
           various certificates, instruments and documents referred to in
           Section 5.2, (b) the Buyer and the Merger Subsidiary shall deliver
           to the Company the various certificates, instruments and documents
           referred to in Section 5.3, (c) the Buyer shall file with the
           Secretary of State of the State of Delaware the Buyer Charter
           Amendment (as defined in Section 4.12), (d) the Company and the
           Merger Subsidiary shall

                                      - 2 -
<PAGE>

           immediately thereafter file with the Secretary of State of the State
           of Delaware the Certificate of Merger, (e)(i) the Buyer shall deliver
           (A) to the Pre-Petition Agent, for the benefit of the Pre-Petition
           Lenders, immediately available funds equal to the excess of (x)
           $649,000,000 over (y) the Company Tower Sale Proceeds (as defined in
           Section 5.2(f)), (B) to the Company immediately available funds when
           and as required in amounts sufficient to pay allowed administrative
           and priority claims and expenses of the Debtors, whether allowed
           prior to or after the Effective Time, as set forth in the Amended
           Plan (collectively, the "Plan Cash") and (C) to a bank trust company
           or other entity reasonably satisfactory to the Company and the Buyer
           appointed by the Buyer to act as the exchange agent (the "Exchange
           Agent") pursuant to Section 1.6(a), certificates representing an
           aggregate number of shares of Buyer Common Stock determined in
           accordance with the pricing mechanism set forth in Schedule II
           attached hereto (the "Plan Shares") to be distributed as contemplated
           by Section 1.6(b), (ii) the Buyer shall issue the Buyer Common Stock
           (and Buyer Class B Common Stock, if applicable) and, if a Rights
           Offering Adjustment shall not have occurred, (A) Buyer Warrants
           purchased through the exercise of Rights and (B) Buyer Warrants
           purchased by or otherwise issued to the Standby Purchasers in
           connection with the Standby Purchase Commitments, and (iii) if a
           Rights Offering Adjustment shall have occurred, the Buyer shall issue
           the Buyer Common Stock purchased through the exercise of the
           Stockholder Rights and, to the extent such Stockholder Rights are not
           exercised, the Buyer shall issue the Buyer Participation Warrants.

           6. Section 1.7. Section 1.7 of the Merger Agreement is hereby amended
to read in its entirety as follows:

           1.7       Distribution to Holders of Buyer Common Stock.

           (a) If a Rights Offering Adjustment shall not have occurred, the
           Buyer shall, as soon as practicable after receipt of the Confirmation
           Order, declare and make, subject to and effective immediately after
           the occurrence of the Effective Time, a distribution of Buyer
           Warrants on the shares of Buyer Common Stock and the Buyer's Series C
           Convertible Preferred Stock, $.01 par value per share (the "Buyer
           Preferred Stock" and, together with the Buyer Common Stock, the
           "Buyer Stock"), outstanding immediately prior to the Effective Time .
           The Buyer Warrants to be distributed pursuant to this Section 1.7(a)
           will entitle the holders thereof to purchase, in the aggregate, a
           number of shares of Buyer Common Stock equal to 7.00% of the
           aggregate number of shares of issued and outstanding Buyer Common
           Stock and, if applicable, Buyer Class B Common Stock on the date the
           Initial Buyer Market Price is determined in accordance with Schedule
           II attached hereto, computed on a Fully Diluted Basis after giving
           effect to the Amended Plan as if the Effective Date had occurred on
           such date and assuming 21,067,110 shares of Buyer Common Stock were
           issued and outstanding immediately prior thereto.

           (b) The Buyer shall conduct the Stockholder Rights Offering in
           accordance with Section 4.22, and, if a Rights Offering Adjustment
           shall have occurred, the Buyer shall, as soon as practicable after
           the occurrence of the Effective Time, declare and make a distribution
           to

                                      - 3 -
<PAGE>

           each Stockholder Rights Holder of one Buyer Participation Warrant for
           each Stockholder Right of such Stockholder Rights Holder that shall
           not have been exercised.

           (c) Notwithstanding the foregoing, no fractional Buyer Warrants or
           Buyer Participation Warrants, as the case may be, shall be issued in
           the distribution of Buyer Warrants or Buyer Participation Warrants to
           be made pursuant to this Section 1.7 (the "Buyer Distribution"); in
           lieu thereof, fractional Buyer Warrants or Buyer Participation
           Warrants, as the case may be, that would otherwise be issued in the
           Buyer Distribution will be rounded up to the nearest whole number of
           Buyer Warrants or Buyer Participation Warrants, as the case may be.

           7. Section 3.1(b). Section 3.1(b) of the Merger Agreement is hereby
amended to read in its entirety as follows:

           (b) Each of the Buyer and the Merger Subsidiary has all requisite
           power and authority to execute and deliver this Agreement. The
           execution and delivery of this Agreement by the Buyer and the Merger
           Subsidiary and, subject to the approval of the Buyer Charter
           Amendment (as defined in Section 4.12) and the Buyer Share Issuance
           (as defined below in this Section 3.1(b)) by the stockholders of the
           Buyer, the performance of this Agreement and the consummation of the
           transactions contemplated hereby by the Buyer and the Merger
           Subsidiary have been duly and validly authorized by all necessary
           corporate action on the part of the Buyer and the Merger Subsidiary.
           This Agreement has been duly and validly executed and delivered by
           the Buyer and the Merger Subsidiary and constitutes a valid and
           binding obligation of the Buyer and the Merger Subsidiary,
           enforceable against the Buyer and the Merger Subsidiary in accordance
           with its terms. For purposes of this Agreement, "Buyer Share
           Issuance" means the issuance by the Buyer of shares of its capital
           stock as contemplated by this Agreement and the Amended Plan,
           including (i) the issuance of the Plan Shares as contemplated by the
           Merger Agreement and the Amended Plan, (ii) the issuance of shares of
           Buyer Common Stock and, if applicable, shares of Class B Common
           Stock, par value $0.01 per share, of the Buyer ("Buyer Class B Common
           Stock") having the terms specified in the Buyer Charter Amendment
           upon exercise of Rights issued pursuant to the Rights Offering or
           issued to the Standby Purchasers (or their assignees or persons in
           substitution therefor) pursuant to the Standby Purchase Commitments
           in connection with the Rights Offering and, if a Rights Offering
           Adjustment shall have occurred, the issuance of shares of Buyer
           Common Stock upon exercise of Stockholder Rights issued pursuant to
           the Stockholder Rights Offering, and (iii) (A) if a Rights Offering
           Adjustment shall not have occurred, the issuance of the Buyer
           Warrants by the Buyer (x) pursuant to the Rights Offering, (y) to the
           Standby Purchasers in connection with the Rights Offering, and (z)
           pursuant to the Buyer Distribution, and the issuance of shares of
           Buyer Common Stock upon exercise of any of the foregoing Buyer
           Warrants, or (B) if a Rights Offering Adjustment shall have occurred,
           the issuance of the Buyer Participation Warrants by the Buyer (x) to
           the Standby Purchasers in connection with the Rights Offering and (y)
           pursuant to the Buyer Distribution, and the issuance of shares of
           Buyer Common Stock upon exercise of any of the foregoing Buyer
           Participation Warrants.

                                      - 4 -
<PAGE>

           8. Section 3.2(e). Section 3.2(e) of the Merger Agreement is hereby
amended to read in its entirety as follows:

           (e) (i) The Plan Shares to be issued and distributed as contemplated
           by Sections 1.3(e) and 1.6 of this Agreement, (ii) the shares of
           Buyer Common Stock to be issued and distributed pursuant to the
           Stockholder Rights Offering, (iii) the shares of Buyer Common Stock
           and the shares of Buyer Class B Common Stock, if applicable, to be
           issued and delivered pursuant to the Rights Offering (as defined in
           Section 4.20(a)) or as contemplated by the Standby Purchase
           Commitments, (iv) the shares of Buyer Common Stock to be issued and
           delivered upon conversion of shares of Buyer Class B Common Stock, if
           applicable, when so converted in accordance with the Buyer Charter
           Amendment (as defined in Section 4.12), (v) either (A), if a Rights
           Offering Adjustment shall not have occurred, the Buyer Warrants to be
           issued and distributed pursuant to the Rights Offering or as
           otherwise contemplated by the Standby Purchase Commitments or (B) if
           a Rights Offering Adjustment shall have occurred, the Buyer
           Participation Warrants to be issued and delivered as contemplated by
           the Standby Purchase Commitments, in either case when so issued and
           distributed or delivered, as the case may be, and (vi) either (A), if
           a Rights Offering Adjustment shall not have occurred, the shares of
           Buyer Common Stock to be issued and delivered upon exercise of Buyer
           Warrants, when issued, paid for and delivered as provided in the
           Buyer Warrant Agreement or (B) if a Rights Offering Adjustment shall
           have occurred, the shares of Buyer Common Stock to be issued and
           delivered upon exercise of Buyer Participation Warrants, when issued,
           paid for and delivered as provided in the Buyer Participation Warrant
           Agreement, will all be duly authorized, validly issued, fully paid,
           nonassessable and free of preemptive rights.

           9. Section 3.23. Section 3.23 of the Merger Agreement is hereby
amended to read in its entirety as follows:

           3.23      Rights Agreement; Section 203.

           (a) The Buyer has executed amendments dated as of August 18, 1998 and
           September 3, 1998 to its Rights Agreement dated as of October 13,
           1995 in the forms attached hereto as Exhibit D, and Exhibit D-1,
           respectively.

           (b) The Board of Directors of the Buyer has approved this Agreement,
           the Merger and the Amended Plan together with the transactions
           contemplated hereby and thereby (including without limitation the
           acquisition by the Standby Purchasers of Buyer Warrants or Buyer
           Participation Warrants, as the case may be, and Buyer Common Stock or
           Buyer Class B Common Stock, if applicable, pursuant to this
           Agreement, the Amended Plan and the Standby Purchase Commitments, or
           of Buyer Common Stock pursuant to the Buyer Warrants or Buyer
           Participation Warrants, as the case may be), including for purposes
           of Section 203 of the DGCL.

           10. Section 4.9. Section 4.9 of the Merger Agreement is hereby
amended to read in its entirety as follows:

                                      - 5 -
<PAGE>

           4.9 Nasdaq National Market Quotation. The Buyer shall use its best
           efforts to have the shares of Buyer Common Stock (including all such
           shares issuable upon conversion of the Buyer Class B Common Stock and
           upon exercise of the Buyer Warrants or Buyer Participation Warrants,
           as the case may be) and Buyer Warrants or Buyer Participation
           Warrants, as the case may be, to be issued as contemplated by the
           Amended Plan and this Agreement approved for quotation on the Nasdaq
           National Market prior to the Closing.

           11. Section 4.13. Section 4.13 of the Merger Agreement is hereby
amended to read in its entirety as follows:

           4.13      Proxy Statement, Disclosure Statement, Etc.

           (a) The Buyer shall promptly after execution of this Agreement
           prepare and file with the SEC under the Exchange Act, and shall use
           its best efforts to have declared effective by the SEC as soon as
           practicable thereafter and shall thereafter promptly mail to its
           stockholders, a proxy statement/prospectus for the Meeting and to
           effect the Stockholder Rights Offering (the "Proxy Statement"). The
           Buyer shall also take any action required to be taken under state
           blue sky laws or other securities laws in connection with the
           Stockholder Rights Offering. The Proxy Statement shall be mailed to
           stockholders of the Buyer at least 20 business days in advance of the
           date of the Meeting. The Company shall furnish the Buyer with all
           information (including, without limitation, its Audited Financial
           Statements and the Unaudited Quarterly Financial Statements, pro
           forma financial information and projections included in the
           Disclosure Statement) and shall take such other action (including
           obtaining any necessary consents from the accountants) as the Buyer
           may reasonably request in connection with the Proxy Statement. The
           Buyer shall consult with the Company and its counsel in connection
           with, and shall permit the Company and its counsel to participate in,
           the preparation of the Proxy Statement and any amendments or
           supplements thereto.

           (b) The Buyer shall promptly notify the Company of the receipt of the
           comments of the SEC and of any requests by the SEC for amendments or
           supplements to the Proxy Statement or for additional information, and
           shall promptly supply the Debtors with copies of all correspondence
           between it (or its representatives) and the SEC (or its staff) with
           respect thereto, and shall permit counsel for the Company to
           participate in any telephone conferences or meetings with the staff
           of the SEC. If, at any time prior to the Meeting, any event should
           occur relating to or affecting a Party or its officers or directors,
           which event should be described in an amendment or supplement to the
           Proxy Statement, such Party shall promptly inform the other Party and
           shall cooperate in promptly preparing, filing and clearing with the
           SEC and, if required by applicable securities law, mailing to the
           Buyer's stockholders, as the case may be, such amendment or
           supplement.

           (c) The Buyer shall furnish the Company with all information
           (including historical and pro forma financial information and
           projections of the Buyer) and shall take such other action as the
           Company may reasonably request in connection with the Disclosure
           Statement. The Company shall consult with the Buyer and its counsel
           in connection with, and shall

                                      - 6 -
<PAGE>

           permit the Buyer and its counsel to participate in, the preparation
           and Bankruptcy Court approval process of the Disclosure Statement and
           any amendments or supplements thereto.

           12. Section 4.19. Section 4.19 of the Merger Agreement is hereby
amended to read in its entirety as follows:

           4.19 Rights Agreement. The Buyer shall not (i) amend the Rights
           Agreement other than as contemplated by Section 3.23 or (ii) take any
           action with respect to, or make any determination under, the Rights
           Agreement (including a redemption of the Preferred Rights) with the
           purpose of facilitating a Buyer Acquisition Proposal.

           13. Section 4.20(a). Section 4.20(a) of the Merger Agreement is
hereby amended to read in its entirety as follows:

           4.20 Buyer Rights Offering Registration Statement. (a) As specified
           in the Amended Plan, the Buyer will issue (the "Rights Offering") to
           the holders of certain Allowed Claims as specified in the Amended
           Plan Rights to purchase, for an aggregate consideration of $217
           million, shares of Buyer Common Stock, Buyer Class B Common Stock, if
           applicable, and, if a Rights Offering Adjustment shall not have
           occurred, Buyer Warrants. The Rights Offering will be made
           substantially on the terms set forth in Schedule III hereto.

           14. New Section 4.22. The Merger Agreement is hereby amended to add
the following immediately following Section 4.21 thereof:

           4.22 Stockholder Rights Offering. If a Rights Offering Adjustment
           shall have occurred, the Buyer will offer (the "Stockholder Rights
           Offering") to the Stockholder Rights Holders Stockholder Rights to
           purchase for cash shares of Buyer Common Stock. The Stockholder
           Rights Offering will be made substantially on the terms set forth in
           Schedule IV hereto.

           15. Section 5.1(f). Section 5.1(f) of the Merger Agreement is hereby
amended to read in its entirety as follows:

           (f) each of the Registration Statement and the Proxy Statement shall
           have been declared effective and no stop order with respect to either
           of the Registration Statement or the Proxy Statement shall be in
           effect;

           16. Section 5.1(g). Section 5.1(g) of the Merger Agreement is hereby
amended to read in its entirety as follows:

           (g) the shares of Buyer Common Stock (including all such shares
           issuable upon conversion of the Buyer Class B Common Stock and the
           Buyer Warrants or Buyer Participation Warrants, as the case may be)
           to be issued as contemplated by the Amended Plan and this Agreement
           shall have been approved for quotation on the Nasdaq National Market.

                                      - 7 -
<PAGE>

           17. Section 5.2(e). Section 5.2(e) of the Merger Agreement is hereby
amended to read in its entirety as follows:

           (e) after each of the Registration Statement and the Proxy Statement
           has been declared effective, each of the Rights Offering and the
           Stockholder Rights Offering shall have expired and the Buyer shall
           have received aggregate proceeds therefrom (and/or from the closings
           contemplated by the Standby Purchase Commitments) of at least $217.0
           million; and

           18. Section 6.1(f). Section 6.1(f) of the Merger Agreement is hereby
amended to add the following at the end thereof:

                     provided, however, that such termination shall not be
                     effective unless such notice is delivered on or before
                     October 4, 1998;

           19. Amended Exhibit A. Exhibit A to the Merger Agreement is hereby
amended to read in its entirety as Exhibit A hereto.

           20. Amended Exhibit B. Exhibit B to the Merger Agreement is hereby
amended to read in its entirety as Exhibit B hereto.

           21. New Exhibit B-1. Exhibit B-1 hereto is hereby added as Exhibit
B-1 to the Merger Agreement.

           22. New Exhibit D-1. Exhibit D-1 hereto is hereby added as Exhibit
D-1 to the Merger Agreement.

           23. Amended Exhibit F. Exhibit F to the Merger Agreement is hereby
amended to read in its entirety as Exhibit F hereto.

           24. Amended Schedule II. Schedule II to the Merger Agreement is
hereby amended to read in its entirety as Schedule II hereto.

           25. Amended Schedule III. Schedule III to the Merger Agreement is
hereby amended to read in it entirety as Schedule III hereto.

           26. New Schedule IV. Schedule IV hereto is hereby added as Schedule
IV to the Merger Agreement.

           27. Continuation of Merger Agreement. Except as specifically amended
hereby, the Merger Agreement shall continue in full force and effect and is
hereby ratified and confirmed in all respects.

           28. Governing Law. This Amendment shall be governed by and construed
in accordance with the internal laws (and not the law of conflicts) of the State
of Delaware.

                                      - 8 -
<PAGE>

           29. Counterparts. This Amendment may be executed in one or more 
counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                      - 9 -
<PAGE>

           IN WITNESS WHEREOF, the Parties have executed this Amendment as of
the date first above written.

                                    ARCH COMMUNICATIONS GROUP, INC.


                                    By:
                                        ------------------------------------
                                        Name:  
                                               -----------------------------
                                        Title: 
                                               -----------------------------


                                    FARM TEAM CORP.


                                    By:
                                        ------------------------------------
                                        Name:  
                                               -----------------------------
                                        Title: 
                                               -----------------------------


                                    SUBJECT TO THE RECEIPT OF THE CONFIRMATION
                                    ORDER FROM THE BANKRUPTCY COURT WITH RESPECT
                                    TO THE AMENDED PLAN:


                                    MOBILEMEDIA CORPORATION


                                    By:
                                        ------------------------------------
                                        Name:  
                                               -----------------------------
                                        Title: 
                                               -----------------------------


                                    MOBILEMEDIA COMMUNICATIONS,
                                      INC.


                                      By:
                                          ------------------------------------
                                          Name:  
                                                 -----------------------------
                                          Title: 
                                                 -----------------------------


                                     - 10 -
<PAGE>

                                     CONSENT

                  Each of the undersigned hereby acknowledges that this
Amendment (including the amendments to the exhibits to the Merger Agreement
effected thereby) is in form and substance reasonably satisfactory to it.


                                      Northwestern Mutual Series Fund, Inc.
                                        for the High Yield Bond Portfolio


                                      By: 
                                         -------------------------------------
                                      Name: Timothy S. Collins
                                      Its:  Vice President


                                      The Northwestern Mutual Life
                                        Insurance Company
                                        for its Group Annuity Separate Account


                                        By: Northwestern Investment
                                              Management Company


                                      By: 
                                         -------------------------------------
                                      Name: Steven P. Swanson
                                      Its:  Managing Director


                                      The Northwestern Mutual Life
                                        Insurance Company


                                      By: 
                                         -------------------------------------
                                      Name: Steven P. Swanson
                                      Its:  Authorized Representative

                                     - 11 -
<PAGE>

                                      W.R. Huff Asset Management Co., L.L.C.,
                                      as agent for its separate accounts and
                                      affiliates


                                      By: 
                                         -------------------------------------
                                      Name: Bryan E. Bloom, Esq.
                                      Its:  Attorney-in-Fact


                                      Whippoorwill Associates, Inc., as general
                                        partner of and/or as agent for each
                                        account, fund or entity listed in its 
                                        Standby Purchase Commitment


                                      By: 
                                         -------------------------------------
                                      Name: David Strumwasser
                                      Its:  Managing Director


                                      Credit Suisse First Boston Corporation


                                      By: 
                                         -------------------------------------
                                      Name: Alex Lagetko
                                      Its:  Director
                                      September 3, 1998

                                      -12-
<PAGE>

                      IN THE UNITED STATES BANKRUPTCY COURT
                          FOR THE DISTRICT OF DELAWARE


In re:                             )                    Chapter 11
                                   )
MobileMedia Communications,        )                    Case No. 97-174 (PJW)
Inc., et al.,                      )
                                   )                    (Jointly Administered)
                   Debtors         )


              DEBTORS' SECOND AMENDED JOINT PLAN OF REORGANIZATION

                            Dated: September 4, 1998


J. Ronald Trost
James D. Johnson
Shelley C. Chapman
Lee M. Stein
SIDLEY & AUSTIN
875 Third Avenue
New York, New York  10022
(212) 906-2000

James L. Patton, Jr. (No. 2202)
Joel A. Waite (No. 2925)
YOUNG CONAWAY STARGATT &
TAYLOR, LLP
P.O. Box 391
Wilmington, Delaware  19899
(302) 571-6600


Co-Counsel to Debtors and
Debtors-in-Possession
<PAGE>

                  MobileMedia Corporation, a Delaware corporation
("MobileMedia"), MobileMedia Communications, Inc., a Delaware corporation
("Communications"), MobileMedia Communications, Inc. (California), a California
corporation, MobileMedia DP Properties, Inc., a Delaware corporation,
MobileMedia PCS, Inc., a Delaware corporation, Dial Page Southeast, Inc., a
Delaware corporation, Radio Call Company of Va., Inc., a Virginia corporation,
MobileMedia Paging, Inc., a Delaware corporation, Mobile Communications
Corporation of America, a Mississippi corporation, MobileComm of the Southeast,
Inc., a Delaware corporation, MobileComm of the Northeast, Inc., a Delaware
corporation, MobileComm Nationwide Operations, Inc., a Delaware corporation,
MobileComm of Tennessee, Inc., a Tennessee corporation, MobileComm of the
Southeast Private Carrier Operations, Inc., a Georgia corporation, MobileComm of
the Southwest, Inc., a Texas corporation, MobileComm of Florida, Inc., a Florida
corporation, MobileComm of the Midsouth, Inc., a Missouri corporation, FWS
Radio, Inc., a Texas corporation, and MobileComm of the West, Inc., a California
corporation, each a debtor and debtor-in-possession herein (collectively, the
"Debtors"), propose the following First Amended Joint Plan of Reorganization
(the "Plan").


                                  INTRODUCTION

                  This Plan encompasses a reorganization of the Debtors pursuant
to which Communications will merge with and into Farm Team Corp., a Delaware
corporation ("Merger Subsidiary") and a subsidiary of Arch Communications Group,
Inc. ("Arch"), with Merger Subsidiary being the surviving company. The Debtors'
creditors will receive cash or equity securities of Arch. There will be no
recovery for the Debtors' equity security holders.

                  Reference is made to the Disclosure Statement accompanying
this Plan, including the exhibits thereto, for a discussion of the Debtors' and
Arch's history, business, results of operations and properties, and for a
summary and analysis of this Plan. All creditors are encouraged to consult the
Disclosure Statement and to read this Plan carefully before voting to accept or
reject this Plan.

                  NO SOLICITATION MATERIALS, OTHER THAN THE DISCLOSURE STATEMENT
AND RELATED MATERIALS TRANSMITTED THEREWITH AND APPROVED BY THE BANKRUPTCY
COURT, HAVE BEEN AUTHORIZED BY THE BANKRUPTCY COURT FOR USE IN SOLICITING
ACCEPTANCES OR REJECTIONS OF THIS PLAN.


                                    ARTICLE I
                           DEFINITIONS; INTERPRETATION

                  1.1  Definitions.

                  In addition to such other terms as are defined in other
Sections of this Plan, the following terms (which appear in this Plan as
capitalized terms) shall have the meanings set forth 
<PAGE>
below. A term used in this Plan and not defined in this Plan but that is defined
in the Code has the meaning set forth in the Code.

                  "9 3/8% Note Indenture" means the Indenture dated as of
November 13, 1995, between Communications, as Issuer, and State Street Bank and
Trust Company, as Trustee.

                  "9 3/8% Notes" means the Senior Subordinated Notes due
November 1, 2007, issued pursuant to the 9 3/8% Note Indenture.

                  "10 1/2% Note Indenture" means the Indenture dated as of
December 1, 1993, between Communications, as Issuer, and First Trust USA (as
successor to BankAmerica National Trust Company), as Trustee, as amended.

                  "10 1/2% Notes" means the 10 1/2% Senior Subordinated Deferred
Coupon Notes due December 1, 2003, issued pursuant to the 10 1/2% Note
Indenture.

                  "1995 Credit Agreement" means the Credit Agreement dated as of
December 4, 1995, as amended, among Communications, the Pre-Petition Lenders and
the Pre-Petition Agent.

                  "Administrative Claim" means a Claim to the extent that it is
of the kind described in section 503(b) of the Code and is entitled to priority
under section 507(a)(1) of the Code.

                  "Allowed" means as to any Claim (whether an Administrative
Claim, Priority Claim, Priority Tax Claim, Secured Claim or Unsecured Claim),
the extent to which such Claim:

                       (a)   (i)   was timely filed or listed in the Schedules
                                   and not listed as disputed, contingent or
                                   unliquidated as to amount; and

                            (ii)   the Debtors, the Reorganized Debtors or any 
                                   other party in interest entitled to do so has
                                   not and does not file an objection to such 
                                   Claim within the time period set forth for 
                                   objecting in Section 4.4;

                       (b)  is allowed by a Final Order of the Bankruptcy Court;
                            or

                       (c)  is allowed by this Plan.

                  "Arch Capital Shares" means, collectively, the Arch Common
Shares and the Arch Class B Common Shares.

                  "Arch Class B Common Shares" means the shares of Class B
Common Stock of Arch, par value $0.01 per share, to be authorized and issued as
and when contemplated by the Merger Agreement.

                                       -2-
<PAGE>

                  "Arch Common Shares" means the shares of Common Stock of Arch,
par value $0.01 per share, which are issued and outstanding plus additional
shares which will be authorized and issued as and when contemplated by the
Merger Agreement.

                  "Arch Participation Warrants" means, if a Rights Offering
Adjustment shall have occurred, warrants for the purchase of Arch Common Shares,
which warrants will be issued pursuant to a Warrant Agreement governing their
issuance and exercise that will be in the form set forth in Exhibit B-1 to the
Merger Agreement.

                  "Arch Series C Convertible Preferred Shares" means the shares
of Series C Convertible Preferred Stock of Arch, par value $0.01 per share.

                  "Arch Stockholder Rights" means non-transferable rights
(except that, at Arch's election, the rights will transfer with the underlying
shares in respect of which the rights are distributed) for the purchase of Arch
Common Shares.

                  "Arch Stockholder Rights Offering" means the issuance of Arch
Stockholder Rights to the holders of Arch Common Stock on a date to be
determined by the Board of Directors of Arch, as more fully described in
Schedule IV to the Merger Agreement.

                  "Arch Stockholder Rights Offering Commencement Date" has the
meaning set forth in Schedule IV to the Merger Agreement.

                  "Arch Warrants" means warrants for the purchase of Arch Common
Shares, which warrants will be issued pursuant to a Warrant Agreement governing
their issuance and exercise that will be in the form set forth in Exhibit B to
the Merger Agreement.

                  "Ballot" means the ballot for voting to accept or reject this
Plan distributed by the Debtors to all holders of impaired Claims entitled to
vote on this Plan.

                  "Bankruptcy Court" means the United States Bankruptcy Court
for the District of Delaware in which the Cases were filed on January 30, 1997,
or any other court with jurisdiction over the Cases.

                  "Bankruptcy Rules" means the Federal Rules of Bankruptcy
Procedure, as amended from time to time to the extent applicable to the Cases.

                  "Benefit Plan Indemnification Obligations" means
Indemnification Obligations with respect to any officer or employee serving as a
fiduciary of any employee benefit plan or program of the Debtors, pursuant to
charter, by law, contract or applicable state law for any actions taken or not
taken in the discharge of such officer's or employee's duties as a fiduciary of
such employee benefit plans or programs.

                                       -3-
<PAGE>

                  "Business Day" means any day other than a Saturday, Sunday or
day on which commercial banks in the city of New York, New York or the States of
New Jersey or Delaware are authorized or required to close.

                  "Capped Administrative Claims" means the Debtors' good faith
estimate of the sum of (i) Priority Tax Claims, (ii) Administrative Claims for
(x) bonuses payable to employees and professionals on or as a result of the
Effective Date, (y) amounts necessary to cure any defaults in executory
contracts or unexpired leases assumed pursuant to this Plan as required by
section 365(b) of the Code and (z) any accrued and unpaid fees and expenses of
professionals retained by the Debtors or the Committee pursuant to orders of the
Bankruptcy Court, and (iii) Claims for (x) the Allowed Class 4 Claims described
in Section 2.6(B)(ii), (iii) and (iv), (y) the Allowed Class 5 Claims described
in Section 2.7(B), and (z) Allowed Class 6 Claims of the indenture trustees
under the Subordinated Indentures described in Section 2.8(C)(3), in each case
(other than those Claims in clause (iii)(z) hereof which shall be payable until
such professionals no longer provide services to their respective constituencies
on account of the Cases), accrued and unpaid or payable as of the Effective
Date, which estimate shall be in reasonable detail (which in the case of
professional fees, shall be in substantially the same form as would be submitted
to the Bankruptcy Court) and shall be delivered to Arch (with a copy to the
Committee) twenty days prior to the Effective Date. If no objection is made by
Arch to the Debtors' estimate within ten days after receipt thereof, the
estimate shall be deemed to be the amount of Capped Administrative Claims for
purposes of Section 2.1(D). If Arch delivers to the Debtors (with a copy to the
Committee) a written objection to the Debtors' estimate within ten days after
receipt of such estimate, and the Debtors and Arch are unable to resolve such
objection, it shall be submitted to the Bankruptcy Court to be determined on or
as soon as practicable after the Effective Date.

                  "Cash Equivalent" means, with respect to any Right, an amount
equal to the value of such Right as determined based on the actual proceeds
received from the sale of Rights from the Rights Reserve pursuant to Section
4.1(B)(5) (or, if the Rights Reserve is then fully depleted, the fair value
thereof as of the time such sale would have occurred based on the market price
for such Right or, if no such price is available, as determined by the Debtors,
Arch and the Committee in good faith or determined by the Bankruptcy Court if no
agreement can be reached).

                  "Cases" means the reorganization proceedings of the Debtors
under chapter 11 of the Code, jointly administered as Case No. 97-174 (PJW).

                  "Causes of Action" means all claims and causes of action now
owned or hereafter acquired by the Debtors, whether arising under any contract
or under the Code or other federal or state law, including, without limitation,
any causes of action arising under sections 544, 545, 547, 548, 549, 550, 551,
553(b) or other sections of the Code.

                  "Claim" means "claim" as defined in section 101(5) of the
Code, as supplemented by section 102(2) of the Code, and shall, in each case,
mean a Claim against any Debtor (whether or not so designated).

                  "Class" means each class of Claims or Claims and Interests
created under this Plan.

                                       -4-
<PAGE>

                  "Class 6 Adjusted Pro Rata Share" means, as to any Allowed
Class 6 Claim, as of the date that is five Business Days prior to the Final
Distribution Date, a fraction (i) the numerator of which is the amount of such
Allowed Class 6 Claim and (ii) the denominator of which is the aggregate amount
of all Allowed Class 6 Claims as of such date.

                  "Class 6 Pro Rata Share" means, as to any Allowed Claim in
Class 6 on the Effective Date or such later date (prior to the Final
Distribution Date) as such Claim becomes Allowed, a fraction (i) the numerator
of which is the amount of such Allowed Claim and (ii) the denominator of which
is the sum of (x) the Effective Date Disputed Claims, (y) the Effective Date
Allowed Claims and (z) an estimate of the aggregate amount of Claims arising
from the rejection of executory contracts and unexpired leases pursuant to
Section 3.1 that are anticipated to become Allowed Claims, such estimate to be
mutually agreed upon by the Debtors, the Committee and Arch in good faith or
determined by the Bankruptcy Court if no such agreement can be reached.

                  "Code" means the United States Bankruptcy Code, 11 U.S.C.
ss.ss. 101 et seq., as amended from time to time to the extent applicable to the
Cases.

                  "Committee" means the Official Committee of Unsecured
Creditors appointed by the United States Trustee for the District of Delaware on
February 10, 1997.

                  "Common Stock" means, collectively, (i) the Class A common
stock of MobileMedia, par value $.001, issued and outstanding immediately prior
to the Effective Date, (ii) the Class B common stock of MobileMedia, par value
$.001, issued and outstanding immediately prior to the Effective Date and (iii)
all options, warrants and other rights to purchase the Class A common stock or
the Class B common stock of MobileMedia.

                  "Common Stock Claim" means any Claim with respect to the
Common Stock of the kind described in section 510(b) of the Code, including,
without limitation, any such Claim asserted in or by the parties to the
Securities Actions and any Claim by an officer, director or underwriter for
contribution, reimbursement or indemnification related thereto.

                  "Confirmation" means "confirmation" as used in section 1129 of
the Code.

                  "Confirmation Date" means the date on which the Confirmation
Order is entered by the Bankruptcy Court.

                  "Confirmation Hearing" means the hearing at which the
Bankruptcy Court considers Confirmation of this Plan.

                  "Confirmation Order" means an order of the Bankruptcy Court
confirming this Plan, which order shall be reasonably satisfactory to Arch and,
as to the provisions relating to the treatment of Allowed Class 4 Claims, the
Pre-Petition Agent.

                                       -5-
<PAGE>

                  "Creditor" means "creditor" as defined in section 101(10) of
the Code and shall mean a creditor of any Debtor.

                  "Creditor Stock Pool" means a number of newly-issued Arch
Common Shares determined in accordance with Schedule II to the Merger Agreement,
as such number of shares constituting the Creditor Stock Pool may be adjusted
pursuant to Section 2.1(D).

                  "Customer Refund Claim" means a Claim by a customer or
subscriber of any of the Debtors for refund of amounts improperly paid or
billed, or for the return of a deposit.

                  "Dial Page Indenture" means the Indenture dated as of February
1, 1993, between Dial Page, Inc., a Delaware corporation, as Issuer, and the
Dial Page Indenture Trustee, as amended.

                  "Dial Page Indenture Trustee" means Norwest Bank Minnesota,
N.A. (as successor to First Union Bank of South Carolina), as Trustee under the
Dial Page Indenture.

                  "Dial Page Notes" means the 12 1/4% Senior Notes due 2000,
issued pursuant to the Dial Page Indenture.

                  "Diluted Basis" means after giving effect to (i) the issuance
and distribution pursuant to this Plan of the Arch Capital Shares (including the
Arch Capital Shares issued upon exercise of the Rights issued pursuant to the
Rights Offering but excluding Arch Capital Shares issued or issuable upon
exercise of the Arch Warrants or Arch Participation Warrants) and (ii) the
assumed issuance of all Arch Common Shares issuable upon conversion of all
convertible preferred stock (including the Arch Series C Convertible Preferred
Shares) and convertible debt securities of Arch outstanding as of the date the
"Buyer Market Price" is determined in accordance with Schedule II to the Merger
Agreement.

                  "DIP Agent" means The Chase Manhattan Bank, in its capacity as
agent for the DIP Lenders under the DIP Credit Agreement.

                  "DIP Approval Orders" means, collectively, (i) the Final Order
(I) Authorizing (A) Secured Post-Petition Financing On A Super Priority Basis
Pursuant To 11 U.S.C. ss. 364, (B) Use Of Cash Collateral Pursuant to 11 U.S.C.
ss. 363 and (C) Grant of Adequate Protection Pursuant To 11 U.S.C. ss.ss. 363
And 364, dated February 19, 1997, (ii) Order (I) Authorizing Extension of (A)
Secured Post-Petition Financing On A Super Priority Basis Pursuant To 11 U.S.C.
ss. 364, (B) Use Of Cash Collateral Pursuant To 11 U.S.C. ss. 363 And (C) Grant
Of Adequate Protection Pursuant To 11 U.S.C. ss.ss. 363 And 364 And (II)
Scheduling A Final Hearing Pursuant To Bankruptcy Rule 4001(c), dated January
27, 1998 and (iii) Order (I) Authorizing Extension of (A) Secured Post-Petition
Financing On A Super Priority Basis Pursuant To 11 U.S.C. ss. 364, (B) Use Of
Cash Collateral Pursuant To 11 U.S.C. ss. 363 And (C) Grant Of Adequate
Protection Pursuant To 11 U.S.C. ss.ss. 363 And 364 And (II) Scheduling A Final
Hearing Pursuant To Bankruptcy Rule 4001(c), dated July 28, 1998.

                                       -6-
<PAGE>

                  "DIP Credit Agreement" means the Revolving Credit and
Guarantee Agreement dated as of January 30, 1997, as amended, among
Communications, as Borrower, MobileMedia, as Parent and Guarantor, each of the
direct and indirect subsidiaries of Communications designated as Guarantor in
Schedule 3.5 thereto, as Guarantors, the DIP Agent and the DIP Lenders.

                  "DIP Lenders" means those financial institutions from time to
time party to the DIP Credit Agreement as lenders.

                  "Director Indemnification Obligations" means Indemnification
Obligations with respect to any present or former director of any of the
Debtors.

                  "Disclosure Statement" means the Disclosure Statement
respecting this Plan approved by order of the Bankruptcy Court, and all
supplements and exhibits thereto.

                  "Disputed Claim" means a Claim against any of the Debtors to
the extent that such Claim is not Allowed.

                  "Effective Date" means the date on which this Plan becomes
effective which date shall be ten Business Days after all the conditions to the
Effective Date set forth in Section 5.1 have first been satisfied or waived, or
such earlier date (but not less than seven Business Days after such conditions
have first been satisfied or waived) as the Debtors, Arch, the Pre-Petition
Agent, the DIP Agent and the Committee shall agree.

                  "Effective Date Allowed Claims" means those Class 6 Claims
that have been Allowed by order of the Bankruptcy Court prior to the Effective
Date or that are Allowed pursuant to this Plan, as set forth in a schedule
delivered by the Debtors to the Exchange Agent and Arch two Business Days prior
to the Effective Date, which schedule, absent manifest error, shall be
conclusive for the purposes of calculating Class 6 Pro Rata Share and Class 6
Adjusted Pro Rata Share.

                  "Effective Date Disputed Claims" means, on and as of the
Effective Date, any Class 6 Claim that is a Disputed Claim on and as of such
date, in the full amount set forth in any timely filed proof of claim or listed
by the Debtors in the Schedules, as set forth in a schedule delivered by the
Debtors to the Exchange Agent and Arch two Business Days prior to the Effective
Date, which schedule, absent manifest error, shall be conclusive for purposes of
calculating Class 6 Pro Rata Share and Class 6 Adjusted Pro Rata Share.

                  "Estate Representative" has the meaning given such term in
Section 4.2(C)(5).

                  "Exchange Agent" means a bank trust company or other entity
reasonably satisfactory to MobileMedia and the Committee, appointed by Arch to
act as the exchange agent for making distributions to the holders of Allowed
Class 6 Claims.

                                       -7-
<PAGE>

                  "Excluded Indemnification Obligations" means Indemnification
Obligations with respect to (i) any present or former officer of the Debtors
considered as of the Effective Date by the FCC to be an alleged wrongdoer for
purposes of the FCC Proceeding, (ii) any present or former officer of the
Debtors now or hereafter named as a defendant in the Securities Actions, as to
claims arising out of the matters alleged in the Securities Actions, (iii) any
present or former officer of the Debtors named as a defendant in any action
initiated after the date hereof based upon similar factual allegations, or
alleging similar causes of action, to the Securities Actions, as to claims
arising out of the matters alleged therein, (iv) any officer or employee of the
Debtors that is not an officer or employee as of the Effective Date, (v) present
or former professionals or advisors of the Debtors, including, without
limitation, accountants, auditors, financial consultants, underwriters or
attorneys, other than Indemnification Obligations arising out of post-petition
agreements approved by the Bankruptcy Court, and (vi) any Indemnification
Obligation of the kind described in section 510(b) of the Code.

                  "FCC" means the Federal Communications Commission or any
governmental authority succeeding to the rights and powers thereof.

                  "FCC Proceeding" means the hearing in WT Docket No. 97-115, In
the Matter of MobileMedia Corporation, et al.

                  "Final Distribution Date" means the tenth Business Day after
the day on which no Class 6 Claim remains a Disputed Claim.

                  "Final Order" means, as to any court, administrative agency or
other tribunal, an order or judgment of such tribunal as entered on its docket
as to which the time to appeal or petition for certiorari has expired and as to
which no appeal or petition for certiorari is pending or, if an appeal or
petition for certiorari has been timely filed or taken, the order or judgment of
the tribunal has been affirmed (or such appeal or petition has been dismissed as
moot) by the highest court (or other tribunal having appellate jurisdiction over
the order or judgment) to which the order was appealed or the petition for
certiorari has been denied, and the time to take any further appeal or to seek
further certiorari has expired.

                  "Fully Diluted Basis" means after giving effect to (i) the
issuance and distribution pursuant to this Plan of the Arch Capital Shares
(including the Arch Capital Shares issued upon exercise of the Rights issued
pursuant to the Rights Offering), (ii) the assumed issuance of all Arch Common
Shares issuable upon conversion of all convertible preferred stock (including
the Arch Series C Convertible Preferred Shares) and convertible debt securities
of Arch outstanding as of the date the "Buyer Market Price" is determined in
accordance with Schedule II to the Merger Agreement, and (iii) the assumed
issuance of all Arch Common Shares issuable upon the exercise of the Arch
Warrants or the Arch Participation Warrants, as the case may be.

                  "Indemnification Obligations" means the obligation of any of
the Debtors to indemnify, reimburse or provide contribution to any present or
former officer, director or employee, or any present or former professionals or
advisors of the Debtors, including, without limitation, accountants, auditors,
financial consultants, underwriters or attorneys, whether 

                                       -8-
<PAGE>

pursuant to charter, by law, contract or statute, regardless of whether the
indemnification is owed in connection with a pre-Petition Date or post-Petition
occurrence.

                  "Interest" means all rights (including unpaid dividends)
arising from any equity security (as defined in section 101(16) of the Code) of
the Debtors, including, without limitation, the Common Stock, but excluding
Common Stock Claims.

                  "License Co. L.L.C." means the limited liability company
formed as a wholly owned subsidiary of MCCA that will hold the Reorganized
Debtors' Licenses after the Effective Date.

                  "Licenses" means the licenses and other authorizations of the
Debtors to operate their paging networks.

                  "Lien" means, with respect to any interest in property, any
mortgage, lien, pledge, charge, security interest, easement or encumbrance of
any kind whatsoever affecting such interest in property.

                  "Merger" means the merger of Communications into Merger
Subsidiary contemplated by the Merger Agreement and Section 4.2(B).

                  "Merger Agreement" means the Agreement and Plan of Merger by
and among Arch, the Merger Subsidiary, MobileMedia and Communications dated as
of August 18, 1998, as amended from time to time.

                  "MCCA" means Mobile Communications Corporation of America, a
Mississippi corporation.

                  "Miscellaneous Secured Claim" means a Secured Claim not
classified in Class 4 under this Plan.

                  "Net Tower Sale Proceeds" shall be the Net Cash Proceeds (as
defined in the DIP Credit Agreement) from the Debtors' sale of their towers and
certain related assets, as set forth in the Tower Sale Agreement, which Net Cash
Proceeds shall be at least $165 million.

                  "Non-Priority Unsecured Claim" means any Unsecured Claim not
classified in Class 3, 5, 7, 8 or 9 under this Plan.

                  "Note Litigation Claim" means any Claim with respect to the
Notes of the kind described in section 510(b) of the Code, including, without
limitation, any such Claim asserted in or by the parties to the Securities
Actions and any Claim by an officer, director or underwriter for contribution,
reimbursement or indemnification related thereto.

                  "Notes" means, collectively, the Dial Page Notes, the 93/8%
Notes and the 10 1/2% Notes.

                                       -9-
<PAGE>

                  "Person" means any person, including, without limitation, any
individual, partnership, joint venture, corporation, company, trust, estate,
unincorporated organization and any governmental unit.

                  "Personal Injury Claim" means a Claim against any of the
Debtors that is unliquidated or contingent as of the Confirmation Date and is of
the kind described in 28 U.S.C. ss. 157(b)(5).

                  "Petition Date" means January 30, 1997, the date on which the
petitions initiating the Cases were filed with the Bankruptcy Court.

                  "Plan" means this Second Amended Joint Plan of Reorganization,
as amended from time to time, and all addenda, exhibits, schedules and other
attachments hereto, as the same may be amended from time to time, pursuant to
this Plan or the Code, all of which are incorporated herein by reference.

                  "Pre-Petition Agent" means The Chase Manhattan Bank, in its
capacity as the agent for the Pre-Petition Lenders under the 1995 Credit
Agreement.

                  "Pre-Petition Lenders" means those financial institutions from
time to time party to the 1995 Credit Agreement as lenders.

                  "Priority Claim" means a Claim to the extent that it is of the
kind described in, and entitled to priority under, section 507(a)(3), (a)(4) or
(a)(6) of the Code.

                  "Priority Tax Claim" means a Claim to the extent that it is of
the kind described in, and entitled to priority under, section 507(a)(8) of the
Code.

                  "Pro Rata Share" means proportionately, so that with respect
to an Allowed Claim other than an Allowed Class 6 Claim, the ratio of (i) the
amount of payments or other property distributable on account of a particular
Allowed Claim in a particular Class under this Plan to (ii) the amount of such
Allowed Claim in such Class is the same as the ratio of (a) the amount of
payments or other property distributable on account of all Allowed Claims in
such Class to (b) the amount of all Allowed Claims in such Class.

                  "Registration Rights Agreement" means a registration rights
agreement to be entered into pursuant to Section 4.9 between Arch and any Person
entitled to become a party to such registration rights agreement under Section
4.9, which shall be in substantially the form attached as Exhibit A.

                  "Reorganized Communications" means, on and after the Effective
Date, Merger Subsidiary, the successor to Communications (as reorganized under
and pursuant to this Plan) and a wholly owned subsidiary of Arch as a result of
the Merger.

                                      -10-
<PAGE>

                  "Reorganized Debtors" means, on and after the Effective Date,
Reorganized Communications and Reorganized MCCA.

                  "Reorganized Debtor's Certificate of Incorporation" means, (i)
as to Reorganized Communications, the Certificate of Incorporation of Merger
Subsidiary, as amended by the Certificate of Merger relating to the Merger and
except that the name of the corporation set forth therein shall be changed to
"MobileMedia Communications, Inc.", and (ii) as to Reorganized MCCA, the
Certificate of Incorporation of Delaware Subsidiary Co.

                  "Reorganized Debtor's Bylaws" means, as to Reorganized
Communications, the Bylaws of Merger Subsidiary, and as to Reorganized MCCA, the
Bylaws of Delaware Subsidiary Co.

                  "Reorganized MCCA" means Delaware Subsidiary Co., the
successor to MCCA (as reorganized under and pursuant to this Plan) and a wholly
owned subsidiary of Reorganized Communications.

                  "Rights" means certificated, transferable rights issued by
Arch. The securities to be offered pursuant to the Rights will include (i) an
aggregate number of Arch Common Shares determined in accordance with Schedule II
to the Merger Agreement and (ii) if there has been no Rights Offering
Adjustment, Arch Warrants entitling the holders thereof to purchase an aggregate
number of Arch Common Shares determined as described in Schedule II to the
Merger Agreement. Each Right will be exercisable for one Unit.

                  "Rights Offering" means the issuance of the Rights by Arch to
holders of Allowed Class 6 Claims on the Rights Offering Commencement Date.

                  "Rights Offering Adjustment" has the meaning set forth in
Schedule II to the Merger Agreement.

                  "Rights Offering Commencement Date" means the date on which
Arch commences the Rights Offering by mailing to holders of Allowed Class 6
Claims as of the Rights Offering Initial Record Date certificates representing
the Rights and instructions for the exercise thereof, which date shall be as
soon as practicable after the later to occur of (i) approval by the Bankruptcy
Court of the Disclosure Statement and (ii) the effectiveness of the Registration
Statement (as defined in the Merger Agreement).

                  "Rights Offering Distribution Pool" means all of the Rights
minus the Rights included in the Rights Reserve.

                  "Rights Offering Expiration Date" means 5:00 p.m., New York
City time, on the date on which the Rights Offering terminates, which date shall
be established by Arch and Communications, on or prior to the Confirmation Date,
but shall be not less than 15 calendar days after the date on which all the
conditions to effectiveness of this Plan shall have been satisfied or waived
(other than (i) the requirement that the order entered by the FCC has become a
Final 
                                      -11-
<PAGE>

Order in connection with the condition set forth in Section 5.1(e) of the Merger
Agreement, and (ii) such conditions that by their nature are to be satisfied on
the Effective Date).

                  "Rights Offering Initial Record Date" means the date that is
the record date to determine which holders of Claims are entitled to vote on
this Plan.

                  "Rights Offering Pro Rata Share" means, as to any Allowed
Class 6 Claim, a fraction, (i) the numerator of which is the amount of such
Allowed Class 6 Claim as of the date of determination and (ii) the denominator
of which is the aggregate amount of Allowed Class 6 Claims as of the Rights
Offering Initial Record Date.

                  "Rights Offering Supplemental Record Date" means the
Confirmation Date.

                  "Rights Reserve" means, as of the Rights Offering Initial
Record Date, a number of Rights equal to the product of (i) the total number of
Rights, and (ii) a fraction, (A) the numerator of which is the sum of the
estimated aggregate amount of (x) Class 6 Claims that are Disputed Claims and
(y) Claims arising from the rejection of executory contracts and unexpired
leases pursuant to Section 3.1 that are anticipated to become Allowed Claims,
such estimate to be mutually agreed upon by the Debtors, the Committee and Arch,
in good faith, or determined by the Bankruptcy Court if no such agreement can be
reached, and (B) the denominator of which is the sum of the estimated aggregate
amount of (x) Class 6 Claims that are Disputed Claims, (y) Claims arising from
the rejection of executory contracts and unexpired leases pursuant to Section
3.1 that are anticipated to become Allowed Claims, such estimate to be mutually
agreed upon by the Debtors, the Committee and Arch, in good faith, or determined
by the Bankruptcy Court if no such agreement can be reached, and (z) all Allowed
Class 6 Claims as of such date.

                  "Schedules" means the joint Schedules of Assets, Liabilities
and Executory Contracts filed by the Debtors with the Clerk of the Bankruptcy
Court for the District of Delaware pursuant to Bankruptcy Rule 1007, as such
schedules have been or may be amended or supplemented by the Debtors from time
to time.

                  "Secured Claim" means a Claim that is secured by a Lien on, or
interest in, property of any of the Debtors, or that is subject to setoff under
section 553 of the Code, but only to the extent of the value of the Creditor's
interest (directly or by enforceable subrogation) in the Debtor's interest in
such property, or to the extent of the amount subject to setoff, which value
shall be determined as provided in section 506(a) of the Code or as provided in
this Plan.

                  "Securities Actions" means, collectively, the actions styled
In re MobileMedia Securities Litigation, No. 96-5723 (AJL) (D. N.J. 1996), Allen
T. Gilliland Trust v. Hellman & Friedman Capital Partners II, L.P., et al.,
Civil Action No. 97-3543 (N.D. Cal. 1997) and Allen T. Gilliland Trust v.
Hellman & Friedman MobileMedia Partners, L.L.C., et al., Case No. 989891 (Cal.
Super. Ct. 1997).

                  "Semi-Annual Distribution Date" means the last Business Day of
each June and December after the Effective Date and prior to the Final
Distribution Date; provided, that if the 

                                      -12-
<PAGE>

Effective Date is within 60 days before the end of June or December, the first
Semi-Annual Distribution Date will be the last Business Day of the next
succeeding June (if the Effective Date is in December) or December (if the
Effective Date is in June).

                  "Standby Purchase Commitment" means the various commitments of
the Standby Purchasers to purchase Units in the event any Rights are not
exercised in the Rights Offering, as evidenced by the letters attached hereto as
Exhibits B-1 through B-6, as such letters may be amended from time to time.

                  "Standby Purchasers" means those creditors of the Debtors that
have executed a Standby Purchase Commitment.

                  "Subordinated Indemnification Obligation Claims" means
Indemnification Obligations that are rejected pursuant to Section 7.5(A) and any
Claims arising therefrom.

                  "Subordinated Indentures" means, collectively, the 93/8% Note
Indenture and the 10 1/2% Note Indenture.

                  "Subordinated Noteholder Claims" means all Claims arising
under or relating to the Subordinated Notes, the Subordinated Indentures and
related agreements, other than Note Litigation Claims.

                  "Subordinated Notes" means, collectively, the 93/8% Notes and
the 10 1/2% Notes.

                  "Subsidiary Claim" means any Claim by a Debtor against another
Debtor.

                  "Subsidiary Interest" means any Interest held by a Debtor in
another Debtor, including all options, warrants and other rights to purchase any
such Interest in a Debtor held by another Debtor.

                  "Tower Sale Agreement" means the Purchase Agreement between
the Debtors and Pinnacle Towers Inc. dated July 7, 1998, as approved by the
Bankruptcy Court on August 10, 1998, or as amended in accordance therewith and
in accordance with the order of the Bankruptcy Court.

                  "Unit" means (i) if there has not been a Rights Offering
Adjustment, (x) one Arch Capital Share and (y) 0.__ of an Arch Warrant(1) and
(ii) if there has been a Rights Offering Adjustment, one Arch Capital Share.

- --------

(1) The fraction of an Arch Warrant that will be included in each Unit will
equal the fraction obtained by dividing (i) the total number of Arch Warrants
purchasable upon exercise of Rights by (ii) the total number of Arch Capital
Shares purchasable upon exercise of Rights (which will be determined based on
the pricing mechanism set forth in Schedule II to the Merger Agreement).


                                      -13-
<PAGE>

                  "Unsecured Claim" means a Claim that is not an Administrative
Claim, a Priority Claim, a Priority Tax Claim or a Secured Claim.

                  "Voting Deadline" means that date set in an order of the
Bankruptcy Court as the deadline for the return of Ballots accepting or
rejecting this Plan.

                  1.2 Interpretation. For purposes of this Plan: (a) whenever
from the context it is appropriate, each term, whether stated in the singular or
the plural, will include both the singular and the plural; (b) unless otherwise
provided in this Plan, any reference in this Plan to a contract, instrument,
release, indenture or other agreement or document being in a particular form or
on particular terms and conditions means that such document will be
substantially in such form or substantially on such terms and conditions; (c)
unless otherwise provided in this Plan, any reference in this Plan to an
existing document or Exhibit means such document or Exhibit, as it may have been
or may be amended, modified or supplemented pursuant to this Plan; (d) unless
otherwise specified herein, any reference to an entity as a holder of a Claim
includes that entity's successors, assigns and affiliates; (e) unless otherwise
specified, all references in this Plan to Sections, Articles and Exhibits are
references to Sections, Articles and Exhibits of or to this Plan; (f) the words
"herein" and "hereto" refer to this Plan in its entirety rather than to a
particular portion of this Plan; (g) captions and headings to Articles and
Sections are inserted for convenience of reference only and are not intended to
be part of or to affect the interpretation of this Plan; and (h) the rules of
construction set forth in section 102 of the Code will apply.

                  1.3 Computation of Time. In computing any period of time
prescribed or allowed by this Plan, the provisions of Bankruptcy Rule 9006(a)
will apply.


                                   ARTICLE II
              CLASSIFICATION AND TREATMENT OF CLAIMS AND INTERESTS

                  The following is a designation of the Classes of Claims and
Interests classified under this Plan, and the treatment to be provided to each
such Class.

                  A Claim or Interest shall be deemed classified in a particular
Class only to the extent that the Claim or Interest qualifies within the
description of that Class and shall be deemed classified in a different Class to
the extent that any remainder of the Claim or Interest qualifies within the
description of such different Class. Administrative Claims and Priority Tax
Claims have not been classified in accordance with section 1123(a)(1) of the
Code, although the treatment for such unclassified Claims is set forth below.

                  The treatment of and consideration to be provided on account
of Claims and Interests pursuant to this Plan shall be in full settlement,
release and discharge of such Claims and Interests; provided, that such
discharge shall not affect the liability of any other entity on, or the property
of any other entity encumbered to secure payment of, any such Claim or Interest,
except as otherwise provided in this Plan; and provided, further, that such
discharge shall not affect the Reorganized Debtors' obligations under and
pursuant to this Plan. The treatment of and 

                                      -14-
<PAGE>

consideration to be provided to Allowed Claim and Interest holders in each Class
shall apply to all of the Cases.

                  No Claim shall entitle the holder thereof to a distribution of
cash or securities or to other consideration pursuant to this Plan unless, and
only to the extent that, such Claim is an Allowed Claim.

UNCLASSIFIED CLAIMS

                  2.1 Administrative Claims.

                       A. General. Subject to the provisions of Section 4.4(A)
and unless otherwise agreed by the holder of an Allowed Administrative Claim (in
which event such other agreement shall govern), each holder of an Allowed
Administrative Claim shall receive on account of such Administrative Claim: (i)
cash equal to the unpaid amount of such Allowed Administrative Claim; or (ii) at
the option of Reorganized Communications, payment in accordance with the
ordinary business terms of such Allowed Administrative Claim.

                       B. Statutory Fees. On or before the Effective Date,
Administrative Claims for fees payable pursuant to section 1930 of title 28 of
the United States Code, 28 U.S.C. ss. 1930, as determined by the Bankruptcy
Court at the Confirmation Hearing, will be paid in cash in an amount equal to
the amount of such Administrative Claims. All such fees payable after the
Effective Date will be assumed by the Reorganized Debtors.

                       C. Ordinary Course Liabilities. Administrative Claims
based on liabilities incurred by the Debtors in the ordinary course of their
businesses will be assumed and paid by Reorganized MCCA pursuant to the terms
and conditions of the particular transaction giving rise to such Administrative
Claim, without any further action by the holders of such Claims.

                       D. Funding of Certain Administrative Claims. Arch shall
make available to Reorganized Communications any monies necessary for
Reorganized Communications to make timely payment of all Administrative Claims;
provided, that in the event the sum of Capped Administrative Claims and the
costs and expenses of the Standby Purchasers as provided in the Standby Purchase
Commitment exceeds $34,000,000, the number of Arch Common Shares constituting
the Creditor Stock Pool shall be reduced by a number of shares equal to (i) the
excess of the sum of (x) Capped Administrative Claims and (y) the costs and
expenses of the Standby Purchasers as provided in the Standby Purchase
Commitment over $34,000,000, divided by (ii) $25.315.

                  2.2 Priority Tax Claims. Unless otherwise agreed by the 
holder of an Allowed Priority Tax Claim (in which event such other agreement
shall govern), each holder of an Allowed Priority Tax Claim against any of the
Debtors shall, on the Effective Date, receive, at Arch's option, either (a) cash
equal to the amount of such Allowed Priority Tax Claim or (b) a promissory note
payable by Reorganized Communications in a principal amount equal to the amount
of such Allowed Priority Tax Claim on which interest shall accrue from and after
the 
                                      -15-
<PAGE>

Effective Date at the rate of 7% or such higher or lower rate as is determined
by the Bankruptcy Court to be appropriate under section 1129(a)(9)(C) of the
Code and shall be paid semiannually in arrears; the principal amount of the
promissory note shall be paid in full on a date or dates six (6) years after the
date of assessment of such Allowed Priority Tax Claim.

CLASSIFIED CLAIMS AGAINST AND INTERESTS IN THE DEBTORS

                  2.3 Class 1 Claims (Priority Claims).

                       A. Classification. Class 1 consists of all Priority 
Claims against any of the Debtors.

                       B. Allowance. Claims in Class 1 shall be allowed or
disallowed in accordance with Section 4.4(B) of this Plan and applicable
provisions of the Code and Bankruptcy Rules.

                       C. Treatment. Allowed Claims in Class 1 shall be paid in
full in cash on the later of the Effective Date and a date that is as soon as
practicable after the date upon which such Claim becomes an Allowed Priority
Claim.

                       D. Impairment and Voting. Class 1 Claims are unimpaired
and are not entitled to vote on this Plan.

                  2.4 Class 2 Claims (Miscellaneous Secured Claims).

                       A. Classification. Class 2 consists of all Miscellaneous
Secured Claims against any of the Debtors, if any.

                       B. Allowance. Claims in Class 2 shall be allowed or
disallowed in accordance with Section 4.4(B) of this Plan and applicable
provisions of the Code and Bankruptcy Rules.

                       C. Treatment. The legal, equitable and contractual rights
to which each holder of an Allowed Claim in Class 2 is entitled shall be left
unaltered or, at the option of the Reorganized Debtors, shall be left unimpaired
in the manner described in section 1124(2) of the Code.

                       D. Impairment and Voting. Class 2 Claims are unimpaired
and are not entitled to vote on this Plan.

                  2.5 Class 3 Claims (Customer Refund Claims).

                       A. Classification. Class 3 consists of all Customer
Refund Claims against any of the Debtors not otherwise classified in Class 1 or
Class 2.

                                      -16-
<PAGE>

                       B. Allowance. Claims in Class 3 shall be allowed or
disallowed in accordance with Section 4.4(B) of this Plan and applicable
provisions of the Code and Bankruptcy Rules.

                       C. Treatment. The legal, equitable and contractual rights
to which each holder of an Allowed Claim in Class 3 is entitled shall be left
unaltered or, at the option of the Reorganized Debtors, shall be left unimpaired
in the manner described in section 1124(2) of the Code.

                       D. Impairment and Voting. Class 3 Claims are unimpaired
and are not entitled to vote on this Plan.

                  2.6 Class 4 Claims (Claims arising under or related to the
1995 Credit Agreement).

                       A. Classification. Class 4 consists of all Secured Claims
against any of the Debtors arising under or related to the 1995 Credit
Agreement.

                       B. Allowance. Allowed Class 4 Claims shall consist of the
following unpaid obligations arising under the 1995 Credit Agreement, and shall
be Allowed in an aggregate amount equal to: (i) $649,000,000 minus the Net Tower
Sale Proceeds actually paid to the Pre-Petition Agent on behalf of the holders
of Allowed Class 4 Claims; (ii) reasonable accrued and unpaid commitment, letter
of credit and similar fees under the 1995 Credit Agreement, in an amount, as of
the Petition Date, equal to $179,148.29, together with any such amounts accrued
after the Petition Date and unpaid as of the Effective Date; (iii) the unpaid,
reasonable costs and expenses of the Pre-Petition Agent, to the extent provided
in the 1995 Credit Agreement; and (iv) the unpaid, reasonable costs and expenses
of the members of the Steering Committee for the Pre-Petition Lenders, other
than the Pre-Petition Agent, up to the aggregate amount of $1,000,000. Adequate
protection payments in connection with, and the costs and expenses of the
Pre-Petition Agent arising under, the 1995 Credit Agreement shall continue to be
paid in cash through the Effective Date at the rate and in the manner set forth
under the DIP Approval Orders. Class 4 Claims shall not include interest accrued
at the default rate under Section 5.4(c) of the 1995 Credit Agreement or
otherwise.

                       C. Treatment. Each holder of an Allowed Claim in Class 4
shall receive, in full satisfaction of its Claim, cash equal to the amount of
its Allowed Claim, payable in accordance with Section 4.3(A).

                       D. Impairment and Voting. Class 4 Claims are impaired and
are entitled to vote on this Plan.

                 2.7 Class 5 Claims (Claims arising under or related to the Dial
Page Notes).


                                      -17-
<PAGE>

                       A. Classification. Class 5 consists of all Claims against
any of the Debtors arising under or related to the Dial Page Notes, the Dial
Page Indenture and related agreements, other than Note Litigation Claims.

                       B. Allowance. Class 5 Claims shall be Allowed Claims in
the sum of: (i) the outstanding principal amount of the Dial Page Notes; (ii)
unpaid interest on the Dial Page Notes accrued to the Effective Date calculated
at the non-default rate set forth in the Dial Page Notes; and (iii) the unpaid
reasonable fees and expenses of the trustee for the Dial Page Notes incurred
prior to the Petition Date, to the extent provided for in the Dial Page
Indenture.
                       C. Treatment. Each holder of an Allowed Claim in Class 5
shall receive, in full satisfaction of its Claim, cash equal to the full amount
of its Allowed Claim, payable in accordance with Section 4.3(B).

                       D. Impairment and Voting. Class 5 Claims are impaired and
are entitled to vote on this Plan.

                 2.8 Class 6 Claims (Non-Priority Unsecured Claims).

                       A. Classification. Class 6 consists of all Non-Priority
Unsecured Claims against any of the Debtors, including the Subordinated
Noteholder Claims.

                       B. Allowance. (i) Class 6 Claims other than Subordinated
Noteholder Claims and Personal Injury Claims shall be allowed or disallowed in
accordance with Section 4.4(B) and applicable provisions of the Code and
Bankruptcy Rules, (ii) Subordinated Noteholder Claims other than Claims of the
indenture trustees under the Subordinated Indentures shall be Allowed Claims in
the sum of: (x) the outstanding principal amount (or outstanding accreted
principal amount, as the case may be) of the Subordinated Notes and (y) unpaid
interest on the Subordinated Notes accrued prior to the Petition Date calculated
at the non-default rate set forth in the Subordinated Notes, (iii) Subordinated
Noteholder Claims for the indenture trustees under the Subordinated Indentures
shall be Allowed Claims in an amount equal to the unpaid reasonable fees and
expenses of each such indenture trustee incurred prior to and after the Petition
Date through the Effective Date, to the extent provided for in the Subordinated
Indentures, and (iv) Personal Injury Claims shall be liquidated and allowed or
disallowed in the district court in which the Cases are pending, or in the
district court in the district in which the claim arose, as determined by the
district court in which the Cases are pending.

                       C. Treatment.

                          1. Each holder of an Allowed Claim in Class 6 (other
than the indenture trustees under the Subordinated Indentures) shall receive:

                          (a) for each holder of an Allowed Claim as of the
                          Rights Offering Initial Record Date, from Arch on the
                          Rights Offering 

                                      -18-
<PAGE>

                          Commencement Date, its Rights Offering Pro Rata Share
                          of the Rights Offering Distribution Pool;

                          (b) for each holder of a Claim that becomes an Allowed
                          Claim after the Rights Offering Initial Record Date
                          but before the Rights Offering Supplemental Record
                          Date, (i) from Arch, as soon as practicable after the
                          Rights Offering Supplemental Record Date, an amount of
                          Rights from the Rights Reserve equal to the amount of
                          Rights that would have been such holder's Rights
                          Offering Pro Rata Share of the Rights Offering
                          Distribution Pool if such holder's Claim had been an
                          Allowed Claim as of the Rights Offering Initial Record
                          Date or, (ii) if the number of Rights in the Rights
                          Reserve on the Rights Offering Supplemental Record
                          Date is insufficient to make the distribution set
                          forth in clause (i), from Arch, (x) its ratable share
                          (based on such holders' respective amounts of Allowed
                          Class 6 Claims) of the Rights in the Rights Reserve on
                          such date and (y) its Cash Equivalent of each Right
                          (or portion thereof) that would have been distributed
                          pursuant to clause (i) if sufficient Rights had been
                          available in the Rights Reserve on the Rights Offering
                          Supplemental Record Date;

                          (c) from Arch on the Effective Date, if such holder
                          has exercised any or all of its Rights in accordance
                          with the terms and conditions thereof, for each Right
                          so exercised, a Unit;

                          (d) for each holder of a Claim in Class 6 that is not
                          Allowed as of the Rights Offering Supplemental Record
                          Date, from Arch, instead of receiving any Rights, as
                          soon as reasonably practical after such Claim becomes
                          an Allowed Claim (but no sooner than the Effective
                          Date), its Cash Equivalent;

                          (e) from the Exchange Agent (x) if such Claim is an
                          Allowed Claim on the Effective Date, on or as soon as
                          practicable after the Effective Date, its Class 6 Pro
                          Rata Share of the Creditor Stock Pool or (y) if such
                          Claim is not an Allowed Claim on the Effective Date,
                          on a later date after which the Claim is Allowed, its
                          Class 6 Pro Rata Share of the Creditor Stock Pool; and

                          (f) from the Exchange Agent on the Final Distribution
                          Date, its Class 6 Adjusted Pro Rata Share of the Arch
                          Common Shares remaining in the Creditor Stock Pool, if
                          any, on such date; provided, that if there are fewer
                          than 10,000 Arch Common Shares remaining in the

                                      -19-
<PAGE>

                          Creditor Stock Pool on the Final Distribution Date, no
                          distribution will be made to holders of Allowed Class
                          6 Claims on such date, and the Arch Common Shares
                          remaining in the Creditor Stock Pool on such date
                          shall be returned to Arch and become treasury shares.

                          2. In lieu of the foregoing treatment, any holder of a
Claim in Class 6 of $1,000 or less may elect, by marking the appropriate box on
the Ballot sent to such holder, to receive cash equal to 50% of its Allowed
Claim, or, if such holder's claim is in excess of $1,000, such holder may elect
to have its Claim reduced to and Allowed at $1,000 and receive cash with respect
to such reduced Claim in accordance with this Section 2.8(C)(2).

                          3. On the Effective Date, the Reorganized Debtors 
shall pay to the indenture trustees under the Subordinated Indentures cash equal
to the amount of fees and expenses of the indenture trustees (including the
reasonable fees and expenses of counsel retained by the indenture trustees), in
accordance with and to the extent provided for in the Subordinated Indentures,
whether incurred prior or subsequent to the Petition Date, without application
by or on behalf of the indenture trustees or their respective counsel to the
Bankruptcy Court.

                       D. Impairment and Voting. Class 6 Claims are impaired 
and are entitled to vote on this Plan.

                 2.9 Class 7 Claims (Note Litigation Claims).

                       A. Classification. Class 7 consists of all Note
Litigation Claims against any of the Debtors.

                       B. Treatment. The holders of Claims in Class 7 shall not
be entitled to receive or retain any property pursuant to this Plan on account
of their Claims.

                       C. Impairment and Voting. Class 7 Claims are impaired and
are deemed not to have accepted this Plan.

                 2.10 Class 8 Claims and Interests (Common Stock Claims and 
Interests and Subordinated Indemnification Obligation Claims).

                       A. Classification. Class 8 consists of all Interests
arising from or related to the Common Stock, all Common Stock Claims and all
Subordinated Indemnification Obligation Claims against any of the Debtors.

                       B. Treatment. Interests in Class 8 shall be canceled, and
the holders of Claims and Interests in Class 8 shall not be entitled to receive
or retain any property on account of their Claims and Interests.

                       C. Impairment and Voting. Class 8 Claims and Interests
are impaired and are deemed not to have accepted this Plan.

                                      -20-
<PAGE>


                 2.11 Class 9 Claims and Interests (Subsidiary Claims and 
Interests).

                       A. Classification. Class 9 consists of all Subsidiary
Claims and Subsidiary Interests.

                       B. Treatment. The Interests in Class 9 shall be canceled,
except that, in accordance with Section 4.2(B), Reorganized Communications shall
retain its Interests in Reorganized MCCA, and the holders of Claims and
Interests in Class 9 shall not be entitled to receive or retain any property on
account of such Claims and Interests.

                       C. Impairment and Voting. Class 9 Claims and Interests
are impaired and are deemed not to have accepted this Plan.


                                   ARTICLE III
              TREATMENT OF EXECUTORY CONTRACTS AND UNEXPIRED LEASES

                 3.1 Rejection.  No later than 25 days prior to the Voting 
Deadline, the Debtors, at the direction of Arch, shall prepare a schedule of the
executory contracts and unexpired leases to be rejected on the Effective Date
(the "Rejection Schedule"). The Rejection Schedule shall be filed and served on
each party to an executory contract or unexpired lease listed thereon to be
rejected by the Debtors no later than twenty days prior to the Voting Deadline.
Any claims for damages arising from the rejection of an executory contract or
unexpired lease listed on the Rejection Schedule must be filed by the Voting
Deadline and shall be determined, if necessary, at Confirmation. The Rejection
Schedule may be amended from and after the Confirmation Date for sixty days
thereafter (but in no event after the Effective Date) by the Debtors at the
direction of Arch and with notice to any party to an executory contract or
unexpired lease added to or removed from such schedule. Any claims for damages
arising from the rejection of an executory contract or unexpired lease rejected
after the Confirmation Date pursuant to this Section 3.1 must be filed within 20
days after receipt of notice of rejection of such contract. Any such Claims not
filed within the applicable 20-day period shall be barred and may not thereafter
be asserted.

                 3.2 Assumption.

                       A. Assumed Contracts. Each executory contract or
unexpired lease of the Debtors that has not expired by its own terms prior to
the Effective Date, has not been rejected during the Cases prior to
Confirmation, is not subject to a notice of rejection and is not rejected under
this Plan shall, by the terms of this Plan, be assumed by Reorganized MCCA
pursuant to sections 365 and 1123(b)(2) of the Code on the Effective Date. All
such assumed contracts, unexpired leases, franchises and permits, and any
contracts or unexpired leases assumed by the Debtors by order of the Bankruptcy
Court prior to the Confirmation Date, shall be vested in and continue in effect
for the benefit of the Reorganized Debtors.

                       B. Cure Payments and Release of Liability. The Debtors
shall, at least twenty days prior to the Voting Deadline, file and serve on all
parties to executory contracts and 

                                      -21-
<PAGE>

unexpired leases to be assumed as of the Effective Date, and on the Pre-Petition
Agent, the Committee and Arch a schedule setting forth the amount of cure and
compensation payments to be provided by the Reorganized Debtors in accordance
with section 365(b)(1) of the Code, which schedule shall be acceptable to Arch.
Objections to any such proposed cure payment must be made by the Voting
Deadline, and shall be determined, if necessary, at the Confirmation Hearing. In
the event the Debtors amend the Rejection Schedule pursuant to Section 3.1 after
the Confirmation Date to remove an executory contract or unexpired lease
therefrom, the Debtors shall, within five days after such amendment to the
Rejection Schedule, file and serve on all parties to executory contracts and
unexpired leases to be assumed as a result of any such Schedule amendment, and
on the Pre-Petition Agent, the Committee and Arch, a supplemental schedule
setting forth the amount of cure and compensation payments to be provided by the
Reorganized Debtors in accordance with section 365(b)(1) of the Code, which
supplemental schedule of cure payments shall be reasonably acceptable to Arch.
Objections to any proposed cure payment set forth in the supplemental schedule
must be made within 20 days after receipt thereof. A party to an assumed
executory contract or unexpired lease that has not filed an appropriate pleading
with the Bankruptcy Court on or before the applicable 20-day period shall be
deemed to have waived its right to dispute such amount. All unpaid cure and
compensation payments under any executory contracts or unexpired leases that are
assumed or assumed and assigned under this Plan (including, without limitation,
Claims filed in the Cases or listed in the Schedules and Allowed by order of the
Bankruptcy Court prior to the Confirmation Date that relate to executory
contracts or unexpired leases that are assumed or assumed and assigned under
this Plan) shall be made by the Reorganized Debtors as soon as practicable after
the Effective Date, but not later than thirty days after the Effective Date;
provided, that, in the event of a dispute regarding the amount of any cure and
compensation payments, the Reorganized Debtors shall make such cure and
compensation payments as may be required by section 365(b)(1) of the Code
following the entry of a Final Order resolving such dispute.

                       C. Continuation of Employment Agreements and Benefits
Agreements. On the Effective Date, the Debtors shall assume pursuant to sections
365 and 1123(b)(2) of the Code the employment and benefit agreements set forth
on Schedule 1.

                 3.3 Post-Petition Contracts and Leases.  All contracts and
leases entered into by the Debtors after the Petition Date, including (a) the
Tower Sale Agreement and (b) the Master Lease between Communications and
Pinnacle Towers Inc. to be entered into pursuant to the Tower Sale Agreement,
but excluding the DIP Credit Agreement, shall be deemed assigned by the Debtors
to Reorganized MCCA on the Effective Date.

                                      -22-
<PAGE>

                                   ARTICLE IV
                             IMPLEMENTATION OF PLAN


                 4.1 Actions Occurring Prior to the Effective Date.

                       A. Actions Occurring Before the Confirmation Date.

                             1. Rights Offering.  Pursuant to the Merger 
Agreement, Arch will commence the Rights Offering and the Arch Stockholder
Rights Offering.

                             2. Standby Purchase Commitments.  Each of the 
Standby Purchasers has executed the Standby Purchase Commitment, copies of which
are attached hereto as Exhibits B-1 through B-6.

                       B. Actions Occurring Between the Confirmation Date and 
the Effective Date.

                             1. Management and Operation of Debtors. After the
Confirmation Date and until the Effective Date, the Debtors shall be managed by
substantially the same personnel that managed and operated the Debtors on the
Confirmation Date, subject to such changes as may be determined by the Board of
Directors of a Debtor in accordance with the Bylaws and Articles or Certificate
of Incorporation of such Debtor. During such period, the Debtors will conduct
their business in the usual, regular and ordinary course, in a manner consistent
with past practice, sound business practice and the terms of this Plan and the
Merger Agreement, and subject to their obligations as debtors-in-possession
pursuant to the Code.

                             2. Continuation of Committee.  The Committee shall 
continue to exist after the Confirmation Date until the Effective Date with the
same power and authority, and the same ability to retain and compensate
professionals, as it had prior to the Confirmation Date, and shall be dissolved
on the Effective Date.

                             3. Rights of Creditors and Committee.  Between the
Confirmation Date and the Effective Date, the Committee, the holders of Claims
against and Interests in the Debtors and the indenture trustees for the Notes
shall be parties-in-interest in all proceedings in the Bankruptcy Court with the
same rights to participate in such proceedings as such persons had prior to
Confirmation.

                             4. Term of Injunctions or Stays.  All injunction or
stays, whether by operation of law or by order of the Bankruptcy Court, provided
for in the Cases pursuant to sections 105 or 362 of the Code or otherwise that
are in effect on the Confirmation Date shall remain in full force and effect
until the Effective Date.

                             5. Sale of Rights Reserve.  Arch shall select an 
agent independent of Arch (as such term is defined in Regulation M promulgated
under the Securities 
                                      -23-
<PAGE>

Exchange Act of 1934), which independent agent shall be reasonably acceptable to
the Debtors and the Committee, to sell Rights from the Rights Reserve in the
over-the-counter market on a date or dates no more than five business days in
advance of the Rights Offering Expiration Date. All proceeds derived from such
sale shall be distributed to Arch.

                 4.2 Actions Occurring on the Effective Date.

                       A. Revesting of Assets. Except as provided in this Plan,
all property of the estate, to the full extent of section 541 of the Code, and
any and all other rights and assets of the Debtors of every kind and nature
shall, on the Effective Date of this Plan, revest in the Reorganized Debtors
free and clear of all Liens, Claims and Interests other than those Liens, Claims
and Interests retained or created pursuant to this Plan.

                       B. Merger. Effective as of the Effective Date but
immediately following the discharge of the Debtors described in Section 6.1,
each of the following transactions shall occur in the order listed: (i)
MobileMedia shall contribute all of its assets to Communications and thereafter
immediately dissolve, at which time the separate corporate existence of
MobileMedia shall cease; (ii) Communications shall merge with and into Merger
Subsidiary, and the separate corporate existence of Communications shall cease
as contemplated by the Merger Agreement; (iii) MCCA shall merge with and into
Delaware Subsidiary Co., a Delaware corporation originally a wholly owned direct
subsidiary of Communications and a wholly owned direct subsidiary of Merger
Subsidiary as a result of the merger described in clause (ii) of this Section
4.2(B), and the separate corporate existence of MCCA shall cease; (iv) all
wholly owned direct subsidiaries of MCCA shall be merged with and into Delaware
Subsidiary Co. (as successor to MCCA); (v) Merger Subsidiary (as successor to
Communications) shall contribute its interest in the common stock of FWS Radio,
Inc. to Delaware Subsidiary Co. (as successor to MCCA), and FWS Radio, Inc.
shall then be merged with and into Delaware Subsidiary Co. (as successor to
MCCA); (vi) MobileComm of the West, Inc., a wholly owned direct subsidiary of
Delaware Subsidiary Co. (as successor to MCCA) as a result of the mergers
described in clause (iv) of this Section 4.2(B), shall be merged with and into
Delaware Subsidiary Co. (as successor to MCCA); (vii) Dial Page Southeast, Inc.,
MobileMedia Communications, Inc. (California), MobileMedia DP Properties, Inc.,
MobileMedia Paging, Inc., MobileMedia PCS, Inc. and Radio Call Co. of Virginia,
Inc., all wholly owned direct subsidiaries of Merger Subsidiary (as successor to
Communications) shall be merged with and into Delaware Subsidiary Co. (as
successor to MCCA); (viii) Merger Subsidiary shall transfer its assets (other
than its shares of Delaware Subsidiary Co.) to Delaware Subsidiary Co.; and (ix)
Delaware Subsidiary Co. shall organize License Co. L.L.C. as a wholly owned
limited liability company of Delaware Subsidiary Co. and shall transfer the
Licenses then held by it to License Co. L.L.C. It is anticipated that License
Co. L.L.C. will be taxed as a branch of Delaware Subsidiary Co. Notwithstanding
the foregoing, Arch and the Reorganized Debtors retain their right to make such
changes in the post-Effective Date corporate structure of Arch and the
Reorganized Debtors as is determined in the business judgment of Arch and
Reorganized Communications.

                                      -24-
<PAGE>

                       C. Amended Certificates of Incorporation and Corporate
Governance.

                             1. Certificates of Incorporation.  As of the 
Effective Date, each Reorganized Debtor's Certificate of Incorporation shall
comply with section 1123(a)(6) of the Code.

                             2. Bylaws.  As of the Effective Date, the bylaws of
Reorganized Communications shall be the same as the bylaws of the Merger
Subsidiary as in effect immediately prior to the Effective Date (except that the
name of the corporation set forth therein shall be changed to "MobileMedia
Communications, Inc."), and the bylaws of Reorganized MCCA shall be the same as
the by laws of Delaware Subsidiary Co. as in effect immediately prior to the
Effective Date (except that the name of the corporation set forth therein shall
be changed to "Mobile Communications Corporation of America"). Each Reorganized
Debtor's Bylaws will be effective as of the Effective Date.

                             3. Corporate Governance.  The directors and 
officers of each Debtor shall continue to serve in such capacities until the
Effective Date. As of the Effective Date, the directors and officers of each
Debtor that is not a Reorganized Debtor will be terminated, the directors and
officers of Merger Subsidiary immediately prior to the Effective Date shall
become the directors and officers of Reorganized Communications, the directors
of Merger Subsidiary immediately prior to the Effective Date shall become the
directors of Reorganized MCCA and the officers of Delaware Subsidiary Co.
immediately prior to the Effective Date shall become the officers of Reorganized
MCCA. The Debtors shall file with the Bankruptcy Court no later than ten (10)
Business Days prior to the Voting Deadline a statement setting forth the office,
the names and affiliations of, and the compensation proposed to be paid to, the
individuals intended to serve as directors and officers of each Reorganized
Debtor, as well as of Arch, on and after the Effective Date. On and after the
Effective Date, each Reorganized Debtor shall be governed in accordance with
such Reorganized Debtor's Certificate of Incorporation and such Reorganized
Debtor's Bylaws.

                             4. Amendments after the Effective Date.  After the
Effective Date, each Reorganized Debtor's Certificate of Incorporation, each
Reorganized Debtor's Bylaws and the officers and directors of each Reorganized
Debtor shall be subject to such amendments or changes as may be made by law, or
by such Reorganized Debtor's Certificate of Incorporation or such Reorganized
Debtor's Bylaws.

                             5. Estate Representative.  Within 15 days after the
Confirmation Date, the Committee shall designate a person, subject to Arch's and
the Debtors' consent (which consent shall not be unreasonably withheld) (the
"Estate Representative"), who shall be responsible for the winding up of the
Debtors' estates after the Effective Date. The Estate Representative shall have

the authority to hire counsel and other advisors, to prosecute and settle
Disputed Claims, to oversee distributions by the Exchange Agent, to pursue any
preserved Causes of Action and otherwise to effect the closing of the Cases. The
Estate Representative shall be reimbursed for all reasonable expenses incurred
in the performance of his or her duties as Estate Representative by Arch based
on a monthly budget to be submitted to Arch no later than ten 

                                      -25-
<PAGE>

Business Days prior to the end of each month after the Effective Date for the
succeeding month, which Budget shall set forth in reasonable detail the proposed
activities to be undertaken by the Estate Representative during such month and
the estimated costs and expenses therefor. If Arch does not object to such
Budget within five Business Days after receipt thereof, it shall be the final
budget for such month. At least once every calendar quarter, the Estate
Representative shall report to Arch on the material activities taken in the
prior quarter and to be taken in the succeeding quarter, which activities shall
be reasonably acceptable to Arch.

                       D. Cancellation of Stock. On and as of the Effective
Date, the Common Stock, and each share of capital stock of each Debtor other
than MobileMedia not owned, beneficially and of record, by MobileMedia or one of
the other Debtors, shall be canceled and rendered null and void.

                 4.3 Distributions Occurring On and After the Effective Date.

                       A. Distributions to Holders of Allowed Class 4 Claims.
The cash distribution to be made to the holders of Allowed Class 4 Claims shall
be made by wire transfer by Arch on the Effective Date or the first Business Day
thereafter to the Pre-Petition Agent, which shall, subject to the rights of the
Pre-Petition Agent, if any, against the other holders of Allowed Class 4 Claims
under the 1995 Credit Agreement, promptly transmit to each such holder its Pro
Rata Share of the cash provided by Arch; provided, that, if requested by a
Standby Purchaser in writing at least two days prior to the Effective Date, any
cash to be distributed to the Standby Purchaser on account of such Standby
Purchaser's Allowed Class 4 Claim shall, in accordance with the instructions
included in such written request, be applied on behalf of the Standby Purchaser
first to the payment of any amounts required to be paid by such Standby
Purchaser in accordance with its Standby Purchase Commitment.

                       B. Distributions to Holders of Dial Page Notes.

                             1. Exchange of Notes.  The cash distribution to be
made to the holders of Allowed Class 5 Claims shall be made by Reorganized
Communications to the Dial Page Indenture Trustee on the Effective Date or the
first Business Day thereafter, which shall, subject to the rights of such Dial
Page Indenture Trustee as against holders of the Dial Page Notes under the Dial
Page Indenture, transmit, upon surrender by a holder of its Dial Page Notes, the
cash to which such holder is entitled under Section 2.7(C). The reasonable fees
and expenses of the Dial Page Indenture Trustee incurred solely in connection
with making such distributions, unless otherwise paid hereunder, shall be paid
by Reorganized Communications to the extent so required by the Dial Page
Indenture or as otherwise agreed between Reorganized Communications, the Dial
Page Indenture Trustee and Arch, and in any case subject to required approvals
of the Bankruptcy Court, if any.

                             2. Lost Notes.  If a holder of a Dial Page Note is
unable to surrender such Note because it has been destroyed, lost or stolen,
such holder may receive a distribution with respect to such Note upon request to
the Dial Page Indenture Trustee in an acceptable form with: (i) proof of such
holder's title to such Note; (ii) proof of the destruction or 

                                      -26-
<PAGE>

theft of such Note, or an affidavit to the effect that the same has been lost
and after diligent search cannot be found; and (iii) such indemnification as may
reasonably be required by the Reorganized Debtors to indemnify Arch, the
Reorganized Debtors, the Dial Page Indenture Trustee and all other persons
deemed appropriate by the Reorganized Debtors, against any loss, action, suit or
other claim whatsoever that may be made as a result of such holder's receipt of
a distribution on account of such Dial Page Note under this Plan.

                       C. Distributions from Arch. Arch will distribute to each
holder of an Allowed Class 6 Claim and each Standby Purchaser that exercised its
Rights in accordance with the terms thereof (and, in the case of the Standby
Purchasers, in accordance with the terms of the Standby Purchase Commitment), on
the Effective Date, for each Right so exercised, the Arch Common Shares or Arch
Class B Shares, as applicable, and, if no Rights Offering Adjustment shall have
occurred, Arch Warrants together comprising the Units subscribed for. Arch will
distribute to each holder of an Allowed Class 6 Claim that was not Allowed as of
the Rights Offering Supplemental Record Date, as soon as practicable after such
Claim is Allowed (but no sooner than the Effective Date), its Cash Equivalent,
as provided in Section 2.8(C)(1)(d). In the event the exercise of Rights and the
purchase of the Units would cause (i) any "person" or "group" (as such terms are
used in Section 13(d) and 14(d) of the Securities and Exchange Act of 1934) or
(ii) the Standby Purchasers collectively, on the Effective Date, in the
aggregate, to beneficially own, within the meaning of Section 13(d)(3) of the
Securities Exchange Act of 1934 and Rule 13d-3 and 13d-5 promulgated thereunder
(except that a Person shall be deemed to have beneficial ownership of all
securities that such Person has the right to acquire, whether such right is
exercisable immediately or only after the passage of time), (a) more than 49.0%
of the number of shares of the capital stock of Arch generally entitled to vote
in the election of directors or (b) more than 49.0% of the total voting power of
the capital stock of Arch, then, the "person" or "group" or the Standby
Purchasers, shall receive in lieu of the Arch Common Shares included in such
Units, Arch Class B Common Shares such that (x) such "person" or "group" or (y)
the Standby Purchasers collectively, on the Effective Date, in the aggregate,
beneficially own, within the meaning of Section 13(d)(3) of the Securities
Exchange Act of 1934, and Rule 13d-3 and 13d-5 promulgated thereunder (except
that a Person shall be deemed to have beneficial ownership of all securities
that such Person has the right to acquire, whether such right is exercisable
immediately or only after the passage of time), (i) no more than 49.0% of the
number of shares of the capital stock of Arch generally entitled to vote in the
election of directors and (ii) no more than 49.0% of the total voting power of
the capital stock of Arch on the Effective Date. For purposes of calculating the
percentages referred to above, it will be assumed that no additional Class 6
Claims are Allowed after the Effective Date and all of the Arch Common Shares in
the Creditor Stock Pool are distributed to the Allowed Class 6 Claims as of the
Effective Date.

                       D. Distributions from the Exchange Agent. On the
Effective Date, Arch will deliver to the Exchange Agent a certificate, in the
name of the Exchange Agent, for the number of Arch Common Shares comprising the
Creditor Stock Pool. Distributions to the holders of Allowed Class 6 Claims
other than on account of the Rights, on the Effective Date and thereafter, shall
be made by the Exchange Agent on behalf of Reorganized Communications from the
Arch Common Shares evidenced by the certificate so delivered by Arch.

                                      -27-
<PAGE>

                             1. Holders of the Subordinated Notes.  As soon as 
practicable after the Effective Date, Reorganized Communications shall cause the
Exchange Agent to send a notice and a transmittal form (which shall specify that
delivery shall be effected and risk of loss and title to the Subordinated Notes
shall pass, only upon delivery of the Subordinated Notes to the Exchange Agent,
and shall be in such form and have such other reasonable provisions as Arch may
reasonably specify) to each holder of a Subordinated Note advising such holder
of the effectiveness of the Merger and this Plan and the procedure for
surrendering to the Exchange Agent such Subordinated Note in exchange for the
Arch Common Shares issuable to it pursuant to Section 2.8(C).

                       Commencing on the Effective Date, the Exchange Agent
shall distribute to each holder of an Allowed Claim that constitutes a
Subordinated Noteholder Claim, upon proper surrender of its Subordinated Notes,
its Pro Rata Share of the Creditor Stock Pool. Thereafter, on each Semi-Annual
Distribution Date, distributions of a holder's Pro Rata Share of the Creditor
Stock Pool shall be made to the holders of Allowed Class 6 Claims that
constitute Subordinated Noteholder Claims who have surrendered their
Subordinated Notes since the preceding SemiAnnual Distribution Date (or, with
respect to the first Semi-Annual Distribution Date, since the Effective Date).
Final distributions of Arch Common Shares shall be made on the Final
Distribution Date to each holder of an Allowed Class 6 Claim constituting a
Subordinated Noteholder Claim based on its Class 6 Adjusted Pro Rata Share of
the remaining shares in the Creditor Stock Pool (subject to Section
2.8(C)(1)(f)).

                       In the event of a transfer of ownership of Subordinated
Notes that is not registered on the transfer records of the indenture trustee
for such Subordinated Notes, the securities to be distributed may be distributed
to a transferee of the Subordinated Notes if an executed letter of transmittal
in form satisfactory to the Exchange Agent is presented to the Exchange Agent,
accompanied by such documents as are required to evidence and effect such
transfer and by evidence that any applicable transfer taxes have been paid.

                       After the Effective Date, there shall be no further
registration of transfers on the record books of Reorganized Communications of
the Subordinated Notes outstanding prior to the Effective Date. If, after the
Effective Date, the Subordinated Notes are presented to Reorganized
Communications for any reason, they shall be canceled and exchanged as provided
in this Section 4.3(D)(1).

                       If any Arch Common Shares are to be issued in the name of
a person other than the person in whose name the Subordinated Note surrendered
in exchange therefor is registered, it shall be a condition to the issuance of
such Arch Common Shares that (i) the Subordinated Note so surrendered shall be
transferable, and shall be properly assigned and endorsed, (ii) such transfer
shall otherwise be proper and (iii) the person requesting such transfer shall
pay to the Exchange Agent any transfer or other taxes payable by reason of the
foregoing or establish to the satisfaction of the Exchange Agent that such taxes
have been paid or are not required to be paid. Notwithstanding the foregoing,
neither the Exchange Agent nor any Person shall be liable to a holder of
Subordinated Notes for any Arch Common Shares issuable to such holder pursuant
to 

                                      -28-
<PAGE>

Section 2.8(C) that are delivered to a public official pursuant to applicable
abandoned property, escheat or similar laws.

                       No dividends or other distributions that are payable to
the holders of record of Arch Common Shares as of a date on or after the
Effective Date shall be paid to holders of Allowed Class 6 Claims entitled to
receive Arch Common Shares pursuant to Section 2.8(C) until such holders
surrender their Subordinated Notes in accordance with this Section 4.3(D)(1).
Upon such surrender, Arch shall pay or deliver to the persons in whose name the
certificates representing such Arch Common Shares are issued any dividends or
other distributions that have been paid or are payable to the holders of record
of Arch Common Shares as of a date on or after the Effective Date and which were
paid or delivered between the Effective Date and the time of such surrender;
provided, that no such person shall be entitled to receive any interest on such
interest payments, dividends or other distributions.

                       If a holder of a Subordinated Note is unable to surrender
such Note because it has been destroyed, lost or stolen, such holder may receive
a distribution with respect to such Note upon request to the Exchange Agent in
an acceptable form with: (i) proof of such holder's title to such Note; (ii)
proof of the destruction or theft of such Note, or an affidavit to the effect
that the same has been lost and after diligent search cannot be found; and (iii)
such indemnification as may reasonably be required by the Reorganized Debtors to
indemnify Arch, the Reorganized Debtors, the Exchange Agent and all other
persons deemed appropriate by the Reorganized Debtors against any loss, action,
suit or other claim whatsoever that may be made as a result of such holder's
receipt of a distribution on account of such Subordinated Note under this Plan.

                             2. Holders of Allowed Class 6 Claims other than the
Subordinated Noteholder Claims. On the Effective Date, the Exchange Agent shall
distribute to each holder of an Effective Date Allowed Claim other than a
Subordinated Noteholder Claim its Class 6 Pro Rata Share of the Creditor Stock
Pool. Thereafter, on each Semi-Annual Distribution Date, distributions of a
holder's Pro Rata Share of the Creditor Stock Pool shall be made to each holder
of a Class 6 Claim other than a Subordinated Noteholder Claim whose Claim has
been Allowed (as certified by the Estate Representative to the Exchange Agent)
since the preceding Semi-Annual Distribution Date (or, with respect to the first
Semi-Annual Distribution Date, since the Effective Date). Final distributions of
Arch Common Shares shall be made on the Final Distribution Date to each holder
of an Allowed Class 6 Claim other than a Subordinated Noteholder Claim based on
its Class 6 Adjusted Pro Rata Share of any shares remaining in the Creditor
Stock Pool (subject to Section 2.8(C)(1)(f)).

                             3. Fractional Interests.  The Arch Capital Shares 
shall be issued and distributed in whole shares, and not in fractional shares.
To the extent that any holder would be entitled to a fractional Arch Capital
Share but for this provision, such holder shall, at Arch's option, (i) be paid
by Reorganized Communications cash in an amount equal to the fraction of said
share multiplied by the price of an Arch Capital Share on the Effective Date, or
(ii) receive the number of whole shares determined by rounding up to the next
whole number of shares. Arch Warrants shall be issued and distributed in whole
units, and not in fractional units. To the extent that any holder would be
entitled to a fractional Arch Warrant but for this provision, such holder 

                                      -29-
<PAGE>

shall receive the number of whole warrants determined by rounding up to the next
whole number of warrants. For purposes of this Section 4.3(D), holders of
Allowed Claims under or evidenced by the Notes shall, in the case of Notes held
in street name, mean the beneficial holders thereof.

                       E. Undeliverable Distributions.

                             1. Method of Distribution.  All property under this
Plan to be distributed by mail shall be sent to the latest mailing address filed
of record with the Bankruptcy Court for the party entitled thereto or, if no
such mailing address has been so filed, the mailing address reflected in the
Schedules or, in the case of the holder of Notes, to the latest mailing address
maintained of record by the pertinent indenture trustee or, if no mailing
address is maintained of record, to the pertinent indenture trustee.

                             2. Holding and Investment of Undeliverable 
Distributions. If any Allowed Claim holder's distribution is returned to the
Debtors, Reorganized Debtors, Arch or the Exchange Agent as undeliverable, no
further distributions will be made to such holder unless the Debtors,
Reorganized Debtors, Arch or the Exchange Agent, as applicable, are notified in
writing of such holder's then-current address. Undeliverable distributions will
remain in the possession of the Debtors, Reorganized Debtors, Arch or the
Exchange Agent, as applicable, pursuant to this Section 4.3(E)(2) until such
time as a distribution becomes deliverable. Undeliverable cash will be held in a
segregated bank account in the name of the Reorganized Debtors for the benefit
of the potential claimants of such funds and, until such time as such cash
becomes property of Arch pursuant to Section 4.3(E)(4), such cash will not
constitute property of Arch. The Reorganized Debtors will invest any
undeliverable cash in a manner consistent with the Reorganized Debtors'
investment and deposit practices. Undeliverable shares of newly-issued Arch
Common Shares will be held by the Exchange Agent for the benefit of the
potential claimants of such securities until the expiration of the time period
set forth in Section 4.3(E)(4).

                             3. After Distributions Become Deliverable.  On each
Semi-Annual Distribution Date and on the Final Distribution Date, the Debtors,
Reorganized Debtors, Arch or the Exchange Agent, as applicable, will make all
distributions that have, prior to such date, become deliverable to holders of
Allowed Claims. Each such distribution will include, to the extent applicable,
dividends or other distributions, if any, that would have been paid in respect
of the shares of Arch Common Shares or Arch Class B Common Shares distributed to
such holder from the Effective Date through the date of such distribution
(without any interest thereon).

                             4. Undistributed Property.  Any property that 
remains undeliverable to the holders of Allowed Claims as of the later of the
Final Distribution Date and the date that is two years after the Effective Date
shall be delivered to, and become the property of, Arch.

                       F. Compliance with Tax Requirements.

                             1. In connection with this Plan, to the extent 
applicable, the Reorganized Debtors will comply with all tax withholding and
reporting requirements imposed on 

                                      -30-
<PAGE>

them by any governmental unit, and all distributions pursuant to this Plan
that may be necessary or appropriate to comply with such withholding and
reporting requirements.

                             2. Notwithstanding any other provision of this 
Plan, each entity that has received any distribution pursuant to this Plan will
have sole and exclusive responsibility for the satisfaction and payment of any
tax obligation imposed by any governmental unit, including income, withholding
and other tax obligations, on account of such distribution.

                 4.4 Procedure For Determination of Claims and Interests.

                       A. Bar Date For Administrative Claims.

                             1. All applications for compensation of 
professional persons employed by the Debtors or the Committee pursuant to orders
entered by the Bankruptcy Court and on account of services rendered prior to the
Confirmation Date and all other requests for payment of administrative costs and
expenses incurred prior to the Confirmation Date pursuant to sections 507(a)(1)
or 503(b) of the Code (except for claims for taxes, trade debt and customer
deposits and credits incurred in the ordinary course of business after the
Petition Date) shall be served on the Reorganized Debtors, the DIP Agent, the
Pre-Petition Agent, the Committee and Arch, and filed with the Bankruptcy Court,
no later than 15 days after the Confirmation Date. Any such claim that is not
filed and served within this time shall be forever barred. Objections to any
such application must be filed within 15 days after receipt thereof; provided,
that Arch shall have no right to object to any such application for professional
fees. From and after the hearing on such applications, the Debtors (or the
Reorganized Debtors if the hearing is after the Effective Date) shall be
authorized to pay all of its and the Committee's professionals in full based on
monthly statements delivered to the Debtors subject to the final hearing
described in Section 4.4(A)(2).

                             2. All applications for final compensation of 
professional persons employed by the Debtors or the Committee pursuant to orders
entered by the Bankruptcy Court and on account of services rendered on or after
the Confirmation Date and prior to the Effective Date and all other requests for
payment of administrative costs and expenses incurred on or after the
Confirmation Date and prior to the Effective Date pursuant to sections 507(a)(1)
or 503(b) of the Code (except for claims for taxes, trade debt and customer
deposits and credits incurred in the ordinary course of business after the
Petition Date) shall be served on the Reorganized Debtors, the DIP Agent, the
Pre-Petition Agent, the Committee and Arch, and filed with the Bankruptcy Court,
no later than 15 days after the Effective Date. Any such claim that is not
served and filed within this time shall be forever barred. Objections to any
such application must be filed within 15 days after receipt thereof; provided,
that Arch shall have no right to object to any such application for professional
fees.

                       B. Objections To Claims.

                             1. Objections to any Administrative Claim (other
than Administrative Claims governed by Section 4.4(A)) and to any other Claim
(other than Class 6 

                                      -31-
<PAGE>

Claims governed by the next sentence of this Section 4.4(B)(1)) must be filed no
later than the Effective Date. Objections must be filed no later than the Rights
Offering Commencement Date as to any Class 6 Claim other than Class 6 Claims
relating to the rejection of executory contracts or unexpired leases pursuant to
this Plan. Objections shall be served on the holder of any Claim being objected
to and counsel for each of Arch, the Pre-Petition Agent, the DIP Agent and the
Committee. No distribution shall be made on account of any Claim that is not
Allowed. To the extent any property is distributed to an entity on account of a
Claim that is not an Allowed Claim, such property shall be held in trust for and
shall promptly be returned to the Reorganized Debtors.

                             2. On and after the Effective Date, only the Estate
Representative shall have authority to continue to prosecute, settle or withdraw
objections to Claims. After the Effective Date, the Estate Representative shall
be entitled to compromise or settle any Disputed Claim without seeking approval
of the Bankruptcy Court. The Estate Representative shall be paid subject to the
budget described in Section 4.2(C)(5), but without seeking approval of the
Bankruptcy Court.

                             3. To the extent that a Disputed Claim ultimately 
becomes an Allowed Claim, payments and distributions on account of such Allowed
Claim shall be made in accordance with the provisions of this Plan governing the
Class of Claims to which such Claim belongs. As soon as practicable after the
date that the order or judgment of the Bankruptcy Court allowing such Claim
becomes a Final Order, any property that would have been distributed prior to
the date on which a Disputed Claim becomes an Allowed Claim shall be
distributed, together with any dividends, payments or other distributions made
on account of such property from the date such distributions would have been due
had such Claim then been an Allowed Claim to the date such distributions are
made (without any interest thereon).

                  4.5 Issuance of Arch Capital Shares. On and as of the
Effective Date, Arch will issue the Arch Common Shares and, if applicable
pursuant to Section 4.3(C), Arch Class B Common Shares to be distributed to the
holders of Allowed Class 6 Claims, to all persons that exercised Rights and, if
applicable, the Standby Purchasers.

                  4.6 Issuance of Warrants. On and as of the Effective Date,
Arch will issue, as applicable, the Arch Warrants or the Arch Participation
Warrants, as contemplated by this Plan, the Rights, the Standby Purchase
Commitment and the Merger Agreement.

                  4.7 Issuance of Rights. On and as of the Rights Offering
Commencement Date, Arch will issue the Rights, as contemplated by this Plan and
the Merger Agreement. On and as of the Arch Stockholder Rights Offering
Commencement Date, Arch will issue the Arch Stockholder Rights.

                  4.8 Exemption from Securities Laws. All notes, instruments,
stock and other securities distributed pursuant to this Plan (other than the
Rights and the Units) are entitled to the benefits and exemptions provided by
section 1145 of the Code.

                                      -32-
<PAGE>

                  4.9 Registration Rights Agreement. Each Person (other than the
Standby Purchasers) that, as a result of the transactions contemplated by this
Plan, becomes the beneficial owner (within the meaning of Section 13(d)(3) of
the Securities Exchange Act of 1934) of at least 10% of the outstanding Arch
Capital Shares, shall be entitled to become a party to the Registration Rights
Agreement.

                  4.10 Effectuating Documents; Further Transactions; Exemption
From Certain Transfer Taxes. The Chief Executive Officer, President, Chief
Financial Officer or any Vice President of Reorganized Communications or the
Debtors, or such other persons as the Bankruptcy Court may designate at the
request of the Debtors, will be authorized to execute, deliver, file or record
such contracts, instruments, releases, indentures and other agreements or
documents and take such actions as may be necessary or appropriate to effectuate
and implement the provisions of this Plan. The Secretary or any Assistant
Secretary of each Debtor or the Reorganized Debtors or such other persons as the
Bankruptcy Court may designate at the request of the Debtors will be authorized
to certify or attest to any of the foregoing actions.

                       Pursuant to section 1146(c) of the Code (a) the issuance,
transfer or exchange of Arch Capital Shares, (b) the creation of any mortgage
deed or trust or other security interest and (c) the making of any agreement or
instrument in furtherance of, or in connection with, this Plan, including any
merger agreements, agreements of consolidation, restructuring, disposition,
liquidation or dissolution, deeds, bills of sale, or assignments executed in
connection with the Merger Agreement, will not be subject to any stamp, real
estate transfer tax or similar tax.

                  4.11 Release of Security Interests. Within ten Business Days
after the Confirmation Date, the Pre-Petition Agent shall deliver to
Communications UCC-3 termination statements and such other documents as are
reasonably requested by Communications to evidence the termination of the
security interests granted to the Pre-Petition Agent to secure amounts
outstanding under the 1995 Credit Agreement, which statements and other
documents shall be held by Communications in escrow and released for filing only
upon receipt by the Pre-Petition Agent of the distribution provided for in
Section 4.3(A).


                                    ARTICLE V
                          CONDITIONS TO EFFECTIVE DATE

                  5.1 Conditions to Occurrence of Effective Date. Each of the
following is a condition to the Effective Date:

                             A. That the Confirmation Order has been entered by 
the Bankruptcy Court, more than ten (10) days have elapsed since the
Confirmation Date, no stay of the Confirmation Order is in effect and the
Confirmation Order has not been reversed, modified or vacated;

                                      -33-
<PAGE>

                             B. That all conditions to the Closing under the 
Merger Agreement (other than the condition set forth in Section 5.1(j) of the
Merger Agreement) have been satisfied or waived by the party entitled thereto,
and the Merger shall occur as contemplated by Section 4.2(B)(ii); and

                             C. The commitments under the DIP Credit Agreement 
shall have terminated, all amounts owing under or in respect of the DIP Credit
Agreement shall have been paid in full in cash and any outstanding letters of
credit issued under and in connection with the DIP Credit Agreement or the 1995
Credit Agreement shall have been terminated or satisfied, or the Debtors shall
have provided cash collateral therefor in accordance with the terms of the DIP
Credit Agreement or the 1995 Credit Agreement, as applicable.

                  5.2 Effect of Non-occurrence of Conditions to the Effective 
Date. If the Merger Agreement is terminated in accordance with its terms, then
the Confirmation Order shall be vacated by the Bankruptcy Court unless the
Debtors, Arch or the Committee files a motion opposing the vacation of the
Confirmation Order within ten Business Days after termination of the Merger
Agreement. The Confirmation Order may not be vacated after all the conditions to
the Effective Date have either occurred or been waived.

                  5.3 Non-consensual Confirmation.  Because Classes 7, 8 and 9
are deemed not to have accepted this Plan pursuant to section 1126(g) of the
Code, as to such Classes and any other Class that votes to reject this Plan, the
Debtors are seeking confirmation of this Plan in accordance with section 1129(b)
of the Code either under the terms provided herein or upon such terms as may
exist if this Plan is modified in accordance with section 1127(d) of the Code.
In the event Class 4 votes to reject this Plan, the Debtors, the Committee and
Arch each reserves the right to contest all or any portion of the amount of the
Allowed Class 4 Claims as set forth in Section 2.6(B).


                                   ARTICLE VI
           DISCHARGE, TERMINATION, INJUNCTION AND SUBORDINATION RIGHTS

                  6.1 Discharge of Claims and Termination of Interests.

                             A. Except as provided in the Confirmation Order, 
the rights afforded under this Plan and the treatment of Claims and Interests
under this Plan will be in exchange for and in complete satisfaction, discharge
and release of all Claims and satisfaction or termination of all Interests,
including any interest accrued on Claims from the Petition Date. Except as
provided in this Plan or the Confirmation Order, Confirmation will, as of the
Effective Date: (i) discharge the Debtors from all Claims or other debts that
arose before the Effective Date, and all debts of the kind specified in sections
502(g), 502(h) or 502(i) of the Code, whether or not (x) a proof of claim based
on such debt is filed or deemed filed pursuant to section 501 of the Code, (y) a
Claim based on such debt is allowed pursuant to section 502 of the Code, or (z)
the holder of a Claim based on such debt has accepted this Plan and (ii) satisfy
or terminate all Interests and other rights of equity security holders in the
Debtors.

                                      -34-
<PAGE>

                             B. As of the Effective Date, except as provided in
this Plan or the Confirmation Order, all entities will be precluded from
asserting against the Debtors or the Reorganized Debtors, or their respective
successors or property, any other or further Claims, demands, debts, rights,
causes of action, liabilities or equity interests based upon any act, omission,
transaction or other activity of any kind or nature that occurred prior to the
Effective Date. In accordance with the foregoing, except as provided in this
Plan or the Confirmation Order, the Confirmation Order will be a judicial
determination, as of the Effective Date, of discharge of all such Claims and
other debts and liabilities against the Debtors and satisfaction or termination
of all Interests and other rights of equity security holders in the Debtors,
pursuant to sections 524 and 1141 of the Bankruptcy Code, and such discharge
will void any judgment obtained against the Debtors or the Reorganized Debtors
at any time, to the extent that such judgment relates to a discharged Claim.

                  6.2 Injunctions.

                             A. Except as provided in this Plan or the 
Confirmation Order, as of the Effective Date, all entities that have held,
currently hold or may hold a Claim or other debt or liability that is discharged
or an Interest or other right of an equity security holder that is terminated
pursuant to the terms of this Plan are permanently enjoined from taking any of
the following actions on account of any such discharged Claims, debts or
liabilities or terminated Interests or rights: (i) commencing or continuing in
any manner any action or other proceeding against the Debtors or the Reorganized
Debtors or Arch or its subsidiaries or their respective property; (ii)
enforcing, attaching, collecting or recovering in any manner any judgment,
award, decree or order against the Debtors or the Reorganized Debtors or Arch or
its subsidiaries or their respective property; (iii) creating, perfecting or
enforcing any lien or encumbrance against the Debtors or the Reorganized Debtors
or Arch or its subsidiaries or their respective property; (iv) asserting a
setoff, right of subrogation or recoupment of any kind against any debt,
liability or obligation due to the Debtors or the Reorganized Debtors or Arch or
its subsidiaries or their respective property; and (v) commencing or continuing
any action, in any manner, in any place that does not comply with or is
inconsistent with the provisions of this Plan.

                             B. As of the Effective Date, all entities that have
held, currently hold or may hold a claim, demand, debt, right, cause of action
or liability that is released pursuant to this Plan are permanently enjoined
from taking any of the following actions on account of such released claims,
demands, debts, rights, causes of action or liabilities: (i) commencing or
continuing in any manner any action or other proceeding; (ii) enforcing,
attaching, collecting or recovering in any manner any judgment, award, decree or
order; (iii) creating, perfecting or enforcing any lien or encumbrance; (iv)
asserting a setoff, right of subrogation or recoupment of any kind against any
debt, liability or obligation due to any released entity; and (v) commencing or
continuing any action, in any manner, in any place that does not comply with or
is inconsistent with the provisions of this Plan.

                             C. By accepting a distribution pursuant to this 
Plan, each holder of an Allowed Claim receiving such distribution pursuant to
this Plan will be deemed to have specifically consented to the injunctions set
forth in this Section 6.2.

                                      -35-
<PAGE>

                 6.3 Termination of Subordination Rights and Settlement of 
Related Claims and Controversies.

                             A. The classification and manner of satisfying all
Claims and Interests under this Plan takes into consideration all contractual,
legal and equitable subordination and turnover rights, whether arising under
general principles of equitable subordination, section 510(c) of the Code or
otherwise, that a holder of a Claim or Interest or the Debtors may have against
other Claim holders with respect to any distribution made pursuant to this Plan.
On the Effective Date, all contractual, legal, equitable subordination and
turnover rights that a holder of a Claim or Interest or the Debtors may have
with respect to any distribution to be made pursuant to this Plan will be
discharged and terminated, and all actions related to the enforcement of such
subordination rights will be permanently enjoined. Accordingly, distributions
pursuant to this Plan to holders of Allowed Claims will not be subject to
payment to a beneficiary of such terminated subordination rights, or to levy,
garnishment, attachment or other legal process by a beneficiary of such
terminated subordination rights.

                             B. Pursuant to Bankruptcy Rule 9019 and in 
consideration for the distributions and other benefits provided under this Plan,
the provisions of this Plan will constitute a good faith compromise and
settlement of all claims or controversies relating to the enforcement or
termination of all contractual, legal and equitable subordination and turnover
rights that a holder of a Claim or Interest or the Debtors may have with respect
to any Allowed Claim or Interest, or any distribution to be made pursuant to
this Plan on account of such Claim. The entry of the Confirmation Order will
constitute the Bankruptcy Court's approval of the compromise or settlement of
all such claims or controversies and the Bankruptcy Court's finding that such
compromise or settlement is in the best interests of the Debtors and the
Reorganized Debtors and their respective property and Claim and Interest
holders, and is fair, equitable and reasonable.


                                   ARTICLE VII
                                  MISCELLANEOUS

                 7.1 Retention of Jurisdiction.  Following the Effective Date, 
the Bankruptcy Court shall retain such jurisdiction as is set forth in this
Plan. Without in any manner limiting the scope of the foregoing, the Bankruptcy
Court shall retain jurisdiction for the following purposes:

                             A. To determine the allowability, classification, 
priority or subordination of Claims and Interests upon objection, or to
estimate, pursuant to section 502(c) of the Code, the amount of any Claim that
is or is anticipated to be contingent or unliquidated as of the Effective Date,
or to hear proceedings to subordinate Claims or Interests brought by any party
in interest with standing to bring such objection or proceeding;

                             B. To construe and to take any action authorized by
the Code and requested by the Reorganized Debtors or any other party in interest
to enforce this Plan and the documents and agreements filed in connection with
this Plan, issue such orders as may be necessary for the implementation,
execution and consummation of this Plan, including, without 

                                      -36-
<PAGE>

limiting the generality of the foregoing, orders to expedite regulatory
decisions for the implementation of this Plan and to ensure conformity with the
terms and conditions of this Plan, such documents and agreements and other
orders of the Bankruptcy Court, notwithstanding any otherwise applicable
non-bankruptcy law;

                             C. To determine any and all applications for 
allowance of compensation and expense reimbursement of professionals retained by
the Debtors, the Reorganized Debtors or the Committee, and for members of the
Committee, for periods on or before the Effective Date, and to determine any
other request for payment of administrative expenses;

                             D. To determine all matters that may be pending
before the Bankruptcy Court on or before the Effective Date;

                             E. To resolve any dispute regarding the 
implementation or interpretation of this Plan, the Merger Agreement or any
related agreement or document that arises at any time before the Cases are
closed, including determination, to the extent a dispute arises, of the entities
entitled to a distribution within any particular Class of Claims and of the
scope and nature of the Reorganized Debtors' obligations to cure defaults under
assumed contracts, leases, franchises and permits;

                             F. To determine any and all applications pending on
the Confirmation Date for the rejection, assumption or assignment of executory
contracts or unexpired leases entered into prior to the Petition Date, and the
allowance of any Claim resulting therefrom;

                             G. To determine all applications, adversary 
proceedings, contested matters and other litigated matters that were brought or
that could have been brought on or before the Effective Date;

                             H. To determine matters concerning local, state and
federal taxes in accordance with sections 346, 505 and 1146 of the Code, and to
determine any tax claims that may arise against the Debtors or Reorganized
Debtors as a result of the transactions contemplated by this Plan;

                             I. To resolve any dispute arising out of actions
taken by the Estate Representative;

                             J. To modify this Plan pursuant to section 1127 of
the Code, or to remedy any apparent nonmaterial defect or omission in this Plan,
or to reconcile any nonmaterial inconsistency in this Plan so as to carry out
its intent and purposes; and

                             K. For such other purposes as may be provided for
in the Confirmation Order.

                                      -37-
<PAGE>

                   Prior to the Effective Date, the Bankruptcy Court shall
retain jurisdiction with respect to each of the foregoing items and all other
matters that were subject to its jurisdiction prior to the Confirmation Date.

                   7.2 Retention and Enforcement Of Causes Of Action. Pursuant
to section 1123(b)(3)(B) of the Code, but subject to Sections 7.3 and 7.4 of
this Plan, the Reorganized Debtors, on behalf of themselves and holders of
Allowed Claims and Interests, shall retain all Causes of Action that the Debtors
had or had power to assert immediately prior to the Effective Date, and may
commence or continue in any appropriate court or tribunal any suit or other
proceeding for the enforcement of such Causes of Action. All Causes of Action
shall remain the property of the Reorganized Debtors. Nothing contained in this
Plan shall constitute a waiver of the rights, if any, of the Debtors or the
Reorganized Debtors to a jury trial with respect to any Cause of Action or
objection to any Claim or Interest.

                   7.3 Limitation of Liability. None of the Debtors, the
Reorganized Debtors, Arch or any affiliate thereof, the Committee, the
Pre-Petition Agent, the Pre-Petition Lenders, the DIP Agent, the DIP Lenders,
the Standby Purchasers, the indenture trustees for the Notes, Arch's financing
sources, nor any of their respective officers, directors, employees, members,
agents, underwriters or investment bankers, nor any other professional Persons
employed by any of them (collectively, the "Exculpated Persons"), shall have or
incur any liability to any Person for any act taken or omission made in good
faith in connection with or related to formulating, negotiating, implementing,
confirming or consummating this Plan, the Disclosure Statement or any contract,
instrument, release or other agreement or document created in connection with
this Plan. The Exculpated Persons shall have no liability to any Debtor, holder
of a Claim, holder of an Interest, other party in interest in the Cases or any
other Person for actions taken or not taken under this Plan, in connection
herewith or with respect hereto, or arising out of their administration of this
Plan or the property to be distributed under this Plan, in good faith,
including, without limitation, failure to obtain Confirmation of this Plan or to
satisfy any condition or conditions, or refusal to waive any condition or
conditions, to the occurrence of the Effective Date, and in all respects such
Exculpated Persons shall be entitled to rely upon the advice of counsel with
respect to their duties and responsibilities under this Plan.

                   7.4 Releases.

                             A. On the Effective Date, the Reorganized Debtors,
on their own behalf and as representatives of the Debtors' estates, in
consideration of services rendered in the Cases and other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged,
release unconditionally, and are deemed to release unconditionally, each of the
Debtors' (1) present officers and directors, (2) former officers and directors
(other than those former officers and directors considered or determined as of
the Effective Date by the FCC to be alleged or actual wrongdoers for purposes of
the FCC Proceeding), (3) the entities that elected such directors to the extent
they are or may be liable for the actions or inactions of such directors and (4)
their respective professional advisers (collectively, the "Officer and Director
Releasees"), from any and all claims, obligations, suits, judgments, damages,
rights, causes of action and liabilities whatsoever (including, without
limitation, those arising under the Code), whether known 

                                      -38-
<PAGE>

or unknown, foreseen or unforeseen, existing or hereafter arising, in law,
equity or otherwise, based in whole or in part on any act, omission,
transaction, event or other occurrence taking place before, on or after the
Petition Date up to the Effective Date, in any way relating to the Debtors
(before, on or after the Petition Date), the Cases or this Plan (collectively,
the "Released Matters"); provided, that the foregoing release shall not apply to
any action or omission that constitutes actual fraud or criminal behavior; and
provided, further, that such release shall not be granted to any Officer or
Director Releasee who has a Disputed Claim as of the Effective Date.

                             B. On the Effective Date, the Reorganized Debtors,
on their own behalf and as representatives of the Debtors' estates, in
consideration of services rendered in the Cases and other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged,
release unconditionally, and are deemed to release unconditionally, each of (1)
the Pre-Petition Lenders, the Pre-Petition Agent, the DIP Lenders and the DIP
Agent and (2) their respective professional advisers (collectively, the "Lender
Releasees"), from the Released Matters; provided, that the foregoing release
shall not apply to any action or omission that constitutes actual fraud or
criminal behavior.

                             C. On the Effective Date, the Reorganized Debtors, 
on their own behalf and as representatives of the Debtors' estates, in
consideration of services rendered in the Cases and other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged,
release unconditionally, and are deemed to release unconditionally, (1) each
member of the Committee, the Committee and their respective present or former
members, officers, directors, employees, affiliates, advisors, attorneys or
agents (collectively, the "Representatives"), (2) the Standby Purchasers and
their Representatives, and (3) their respective professional advisers
(collectively, the "Creditor Releasees"), from the Released Matters; provided,
that the foregoing release shall not apply to any action or omission that
constitutes actual fraud or criminal behavior.

                             D. On the Effective Date, the Reorganized Debtors,
on their own behalf and as representatives of the Debtors' estates, in
consideration of services rendered in the Cases and other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged,
release unconditionally, and are deemed to release unconditionally, Arch, any
affiliate of Arch, or Arch's financing sources, agents, underwriters and
investment bankers and their respective professional advisers (collectively, the
"Arch Releasees") from the Released Matters; provided, that the foregoing
release shall not apply to any action or omission that constitutes actual fraud
or criminal behavior.

                             E. On the Effective Date, Arch and its subsidiaries
shall be deemed to have unconditionally released the Officer and Director
Releasees, the Lender Releasees and the Creditor Releasees from the Released
Matters; provided, that the foregoing release shall not apply to any action or
omission that constitutes actual fraud or criminal behavior; and provided,
further, that such release shall not be granted to any Officer or Director
Releasee who has a Disputed Claim as of the Effective Date.

                                      -39-
<PAGE>

                             F. On the Effective Date, each holder of a Claim
that is entitled to vote on this Plan shall be deemed to have unconditionally
released the Officer and Director Releasees, the Lender Releasees, the Creditor
Releasees and the Arch Releasees from the Released Matters; provided, that the
foregoing release shall not apply to any action or omission that constitutes
actual fraud or criminal behavior and shall not constitute a release of any
recovery such holder would be entitled to as a plaintiff or putative plaintiff
in the Securities Actions or any action initiated after the date hereof based
upon similar factual allegations or alleging similar causes of action to the
Securities Actions; and provided, further, that a holder (other than Arch) may
elect, by checking the appropriate box or boxes provided on the Ballot, not to
grant such release as to the Officer and Director Releasees, the Lender
Releasees, the Creditor

Releasees or the Arch Releasees, or all of them.

                             G.       The Confirmation Order shall contain a 
permanent injunction to effectuate the releases granted in the foregoing
Sections 7.4(A), (B), (C), (D), (E) and (F). Any release granted pursuant to the
foregoing Sections 7.4(A), (B), (C), (D), (E) and (F) shall be ineffective and
null and void automatically and immediately upon the assertion by any released
party of any claim in any manner or in any forum against any party that granted
the release, and all Causes of Action that the Debtors had or had the power to
assert immediately prior to the Effective Date with respect to any such party
shall be preserved and become the property of the Reorganized Debtors pursuant
to Section 7.2.

                   7.5 Indemnification Obligations; Directors' and Officers'
Liability Insurance.

                             A. Director Indemnification Obligations and 
Excluded Indemnification Obligations shall be deemed to be, and shall be treated
as if they are, executory contracts that are rejected pursuant to section 365 of
the Code. Any Claims arising out of the rejection of the Indemnification
Obligations pursuant to this Section 7.5(A) shall be subordinated in full under
sections 510(b) and 510(c) of the Code.

                             B. Benefit Plan Indemnification Obligations and
Indemnification Obligations with respect to officers and employees who are
officers and employees of the Debtors as of the Effective Date (other than
Excluded Indemnification Obligations) shall be deemed to be, and shall be
treated as though they are, executory contracts that are assumed agreements
under this Plan and such obligations (subject to any defenses thereto) shall
remain unaffected and shall not be discharged or impaired hereby, and any Claim
for indemnification filed by any such party shall not be an Allowed Claim
hereunder; provided, that the foregoing assumption shall not affect any release
of any such obligation given in writing to the Debtors before the Effective Date
or to the Reorganized Debtors on or after the Effective Date or any other
releases under Section 7.4.

                             C. On the Effective Date, the Reorganized Debtors
shall purchase a "run-off" policy for the Debtors' current and former directors
and officers (other than those former officers and directors considered or
determined as of the Effective Date by the FCC to be alleged or actual
wrongdoers for purposes of the FCC Proceeding), which policy shall provide for
aggregate coverage up to $40 million (or such lesser amount as can be purchased
for a premium of $750,000) for claims made during a period of at least three (3)
years following the Effective 

                                      -40-
<PAGE>

Date based on alleged "wrongful acts" through the Effective Date, and shall
contain such other usual and customary terms and conditions as are approved by
the Board of Directors of MobileMedia.

                             D. As of the Effective Date, Arch shall make
available up to an aggregate amount of $1,000,000 (the "Defense Fund") to be
used by present and former officers and directors (other than those former
officers and directors considered or determined as of the Effective Date by the
FCC to be alleged or actual wrongdoers for purposes of the FCC Proceeding) of
the Debtors solely for the costs and expenses (including reasonable attorneys'
fees and expenses) of defending the Securities Actions not otherwise covered by
the Debtors' insurance. The Defense Fund is being provided by Arch at its
election and not in exchange for any Claim or Interest by any officer or
director. Provision of the Defense Fund hereunder shall not negate, constitute a
waiver or modification of or otherwise impair the discharge of the Debtors and
the Reorganized Debtors under sections 524 and 1141 of the Code and this Plan.
As a condition to any officer or director obtaining amounts from the Defense
Fund, such officer or director shall deliver to Arch, at Arch's request, a
release, in form and substance reasonably acceptable to Arch, confirming the
unconditional release and discharge of the Arch Releasees and the Reorganized
Debtors from the Released Matters. Any officer or director shall be required to
reimburse Arch for any amounts obtained from the Defense Fund that are
subsequently covered by insurance.

                   7.6 Terms Binding. Upon the entry of the Confirmation Order,
all provisions of this Plan, including all agreements, instruments and other
documents filed in connection with this Plan and executed by the Debtors, Arch
or the Reorganized Debtors in connection with this Plan, shall be binding upon
the Debtors, Arch, the Reorganized Debtors, all Claim and Interest holders and
all other entities that are affected in any manner by this Plan. All agreements,
instruments and other documents filed in connection with this Plan shall have
full force and effect, and shall bind all parties thereto as of the entry of the
Confirmation Order, whether or not such exhibits actually shall be executed by
parties other than the Debtors or the Reorganized Debtors, or shall be issued,
delivered or recorded on the Effective Date or thereafter.

                   7.7 Additional Terms of Securities and Other Instruments. Any
modification of the Merger Agreement, the Arch Warrants, Arch Common Shares and
Arch Class B Common Shares, and all other securities or agreements issued or
entered into pursuant to this Plan after the Voting Deadline, shall be treated
as a Plan modification and shall be governed by section 1127 of the Code.

                   7.8 Post-Consummation Effect of Evidences of Claims or
Interests. Notes, stock certificates and other evidence of Claims against or
Interests in the Debtors shall, effective on the Effective Date, represent only
the right to participate in the distributions contemplated by this Plan.

                   7.9 Payment Dates. Whenever any payment to be made under this
Plan is due on a day other than a Business Day, such payment shall instead be
made, without interest, on the next succeeding Business Day.

                                      -41-
<PAGE>

                   7.10 Successors and Assigns. The rights, benefits and
obligations of any person named or referred to in this Plan shall be binding
upon, and shall inure to the benefit of, the heir, executor, administrator,
successor or assignee of such person.

                   7.11 Inconsistencies. In the event that there is any
inconsistency between this Plan and the Disclosure Statement, any exhibit to
this Plan or any other instrument or document created or executed pursuant to
this Plan, this Plan shall govern.

                   7.12 Compliance with Applicable Law. It is intended that the
provisions of this Plan (including the implementation thereof) shall be in
compliance with applicable law, including, without limitation, the Code, the
Delaware General Corporation Law, as amended, the Communications Act of 1934, as
amended, the Securities Act of 1933, as amended, and the Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended, as well as, in each case, any
rules and regulations promulgated thereunder. If the Debtors shall conclude that
this Plan may not comply with any of the foregoing, then and in such event the
Debtors intend to amend this Plan in such respects as they deem necessary to
bring this Plan into compliance therewith.

                   7.13 Governing Law. Except to the extent that the Code or any
other federal law is applicable or to the extent the law of a different
jurisdiction is validly elected by the Debtors, the rights, duties and
obligations arising under this Plan shall be governed in accordance with the
substantive laws of the United States of America and, to the extent federal law
is not applicable, the laws of the State of Delaware.

                   7.14 Severability. If the Bankruptcy Court determines at the
Confirmation Hearing that any material provision of this Plan is invalid or
unenforceable, such provision, to the extent the Debtors, Arch and the Committee
agree, but subject to section 1127 of the Code, shall be severable from this
Plan and null and void, and, in such event, such determination shall in no way
limit or affect the enforceability or operative effect of any or all other
portions of this Plan.

                   7.15 Incorporation by Reference. Each Exhibit or Schedule
hereto is incorporated herein by reference.

                                      -42-
<PAGE>

                               MOBILEMEDIA COMMUNICATIONS, INC.
                               MOBILEMEDIA CORPORATION
                               MOBILEMEDIA COMMUNICATIONS, INC. (CALIFORNIA)
                               MOBILEMEDIA DP PROPERTIES, INC.
                               MOBILEMEDIA PCS, INC.
                               DIAL PAGE SOUTHEAST, INC.
                               RADIO CALL COMPANY OF VA. INC.
                               MOBILEMEDIA PAGING, INC.
                               MOBILE COMMUNICATIONS CORPORATION OF AMERICA
                               MOBILECOMM OF THE SOUTHEAST, INC.
                               MOBILECOMM OF THE NORTHEAST, INC.
                               MOBILECOMM NATIONWIDE OPERATIONS, INC.
                               MOBILECOMM OF TENNESSEE, INC.
                               MOBILECOMM OF THE SOUTHEAST PRIVATE CARRIER
                                 OPERATIONS, INC.
                               MOBILECOMM OF THE SOUTHWEST, INC.
                               MOBILECOMM OF FLORIDA, INC.
                               MOBILECOMM OF THE MIDSOUTH, INC.
                               FWS RADIO, INC.
                               MOBILECOMM OF THE WEST, INC.

                               Debtors and Debtors-in-Possession


                               By: 
                                   -----------------------------------------
                                   Joseph A. Bondi
                                     Chairman-Restructuring of
                                     MobileMedia Corporation


                                      -43-
<PAGE>

J. Ronald Trost
James D. Johnson
Shelley C. Chapman
Lee M. Stein
SIDLEY & AUSTIN
875 Third Avenue
New York, New York  10022
(212) 906-2000

James L. Patton, Jr. (No. 2202)
Joel A. Waite (No. 2925)
YOUNG CONAWAY STARGATT & TAYLOR, LLP
11th Floor - Rodney Square North
P.O. Box 391
Wilmington, Delaware  19899
(302) 571-6600


COUNSEL TO DEBTORS AND DEBTORS-IN-POSSESSION

                                      -44-
<PAGE>


                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                      Page
<S>                         <C>                                                                        <C>
INTRODUCTION..................................................................................1

ARTICLE I
DEFINITIONS; INTERPRETATION...................................................................1
       1.1       Definitions..................................................................1
       1.2       Interpretation..............................................................14
       1.3       Computation of Time.........................................................14

ARTICLE II
CLASSIFICATION AND TREATMENT OF CLAIMS AND INTERESTS.........................................14
       2.1       Administrative Claims.......................................................15
       2.2       Priority Tax Claims.........................................................15
       2.3       Class 1 Claims (Priority Claims)............................................16
       2.4       Class 2 Claims (Miscellaneous Secured Claims)...............................16
       2.5       Class 3 Claims (Customer Refund Claims).....................................16
       2.6       Class 4 Claims (Claims arising under or related to the 1995 Credit
                 Agreement)..................................................................17
       2.7       Class 5 Claims (Claims arising under or related to the Dial Page Notes).....17
       2.8       Class 6 Claims (Non-Priority Unsecured Claims)..............................18
       2.9       Class 7 Claims (Note Litigation Claims).....................................20
       2.10      Class 8 Claims and Interests (Common Stock Claims and Interests and
                 Subordinated Indemnification Obligation Claims).............................20
       2.11      Class 9 Claims and Interests (Subsidiary Claims and Interests)..............21

ARTICLE III
TREATMENT OF EXECUTORY CONTRACTS AND UNEXPIRED LEASES........................................21
       3.1       Rejection...................................................................21
       3.2       Assumption..................................................................21
       3.3       Post-Petition Contracts and Leases..........................................22

ARTICLE IV
IMPLEMENTATION OF PLAN.......................................................................23
       4.1       Actions Occurring Prior to the Effective Date...............................23
       4.2       Actions Occurring on the Effective Date.....................................24
       4.3       Distributions Occurring On and After the Effective Date.....................26
       4.4       Procedure For Determination of Claims and Interests.........................31
       4.5       Issuance of Arch Capital Shares.............................................32
       4.6       Issuance of Warrants........................................................32
       4.7       Issuance of Rights..........................................................32
       4.8       Exemption from Securities Laws..............................................32
              
                                       -1-
<PAGE>

       4.9      Registration Rights Agreement...............................................33
       4.10     Effectuating Documents; Further Transactions; Exemption From Certain
                Transfer Taxes..............................................................33
       4.11     Release of Security Interests...............................................33

ARTICLE V
CONDITIONS TO EFFECTIVE DATE................................................................33
       5.1      Conditions to Occurrence of Effective Date..................................33
       5.2      Effect of Non-occurrence of Conditions to the Effective Date................34
       5.3      Non-consensual Confirmation.................................................34

ARTICLE VI
DISCHARGE, TERMINATION, INJUNCTION AND SUBORDINATION RIGHTS.................................34
       6.1      Discharge of Claims and Termination of Interests............................34
       6.2      Injunctions.................................................................35
       6.3      Termination of Subordination Rights and Settlement of Related Claims and
                Controversies...............................................................36

ARTICLE VII
MISCELLANEOUS...............................................................................36
       7.1      Retention of Jurisdiction...................................................36
       7.2      Retention and Enforcement Of Causes Of Action...............................38
       7.3      Limitation of Liability.....................................................38
       7.4      Releases....................................................................38
       7.5      Indemnification Obligations; Directors' and Officers' Liability Insurance...40
       7.6      Terms Binding...............................................................41
       7.7      Additional Terms of Securities and Other Instruments........................41
       7.8      Post-Consummation Effect of Evidences of Claims or Interests................41
       7.9      Payment Dates...............................................................41
       7.10     Successors and Assigns......................................................42
       7.11     Inconsistencies.............................................................42
       7.12     Compliance with Applicable Law..............................................42
       7.13     Governing Law...............................................................42
       7.14     Severability................................................................42
       7.15     Incorporation by Reference..................................................42


Exhibit A                                                     Registration Rights Agreement
                                                              (10% Holders)
Exhibits B-1 through B-4                                      Standby Purchase Commitment

Schedule 1                                                    Assumed Employment and Benefit
                                                              Agreements
</TABLE>
<PAGE>


                                                                     EXHIBIT B-1


                     [Form for Buyer Participation Warrants]
================================================================================








                                WARRANT AGREEMENT


                                     between


                               ARCH COMMUNICATIONS
                                   GROUP, INC.

                                       and

                              THE BANK OF NEW YORK







                                _________, 199__







================================================================================
<PAGE>



                                WARRANT AGREEMENT

        This WARRANT AGREEMENT, dated as of ___________, 199__ (the
"Agreement"), is made and entered into by and between Arch Communications Group,
Inc., a Delaware corporation (the "Company"), and The Bank of New York, a
_______________________, as warrant agent (the "Warrant Agent").

                                    RECITALS

        WHEREAS, a plan of reorganization under Chapter 11 of the United States
Bankruptcy Code for MobileMedia Communications, Inc. ("MobileMedia"),
MobileMedia Corporation, the sole stockholder of MobileMedia ("Parent"), and all
of MobileMedia's subsidiaries (the "Plan") was confirmed on ________, 199_ by
order of the United States Bankruptcy Court for the District of Delaware in Case
Nos. 97-174 (PJW) through and including 97-192 (PJW), and has become effective;

        WHEREAS, in connection with the Plan, the Company, a wholly owned
subsidiary of the Company ("Merger Sub"), Parent and MobileMedia entered into an
Agreement and Plan of Merger, dated as of August ___, 1998 (the "Merger
Agreement"), pursuant to which MobileMedia has been merged with and into Merger
Sub, with Merger Sub continuing as the surviving corporation and a wholly owned
subsidiary of the Company;

        WHEREAS, the Plan and the Merger Agreement provide for the execution and
delivery of this Agreement by the Company and the issuance of warrants (the
"Warrants"), each Warrant initially representing the right to purchase one share
of Common Stock (as defined in Section 4.1(h)), on the terms and subject to the
conditions herein set forth; and

        WHEREAS, the Company desires the Warrant Agent to act on behalf of the
Company, and the Warrant Agent is willing to so act, in connection with the
issuance of Warrant Certificates (as defined in Section 1.2) and other matters
as provided herein.

        NOW, THEREFORE, in consideration of the mutual covenants herein set
forth, the parties hereto hereby agree as follows:

        1.  Issuance of Warrants; Form of Warrants.

        1.1. Issuance of Warrants. On the terms and subject to the conditions
set forth in the Plan and the Merger Agreement, the Company will issue and
deliver: (a) an aggregate of __________ Warrants as contemplated by the Standby
Purchase Commitments (as defined in the Plan) as consideration for the
commitments set forth therein and (b) an aggregate of __________ Warrants
pursuant to the Buyer Distribution (as defined in the Merger Agreement) as
provided in Section 1.7(b) of the Merger Agreement. The shares of Common Stock
purchasable upon exercise of the Warrants are hereinafter referred to as the
"Warrant Shares." The purchase price per Warrant Share payable upon the exercise
of a Warrant (the "Warrant Price") will initially be
<PAGE>



$____*. The Warrant Price and the number and kind of Warrant Shares purchasable
upon exercise of the Warrants are subject to adjustment pursuant to the
provisions of Section 4.

        1.2. Form of Warrants. Each Warrant, including without limitation any
Warrants that may be issued upon partial exercise, replacement, or transfer of
Warrants, will be evidenced by, and subject to the terms of, a Warrant
certificate (including the Form of Exercise Notice and Form of Assignment to be
printed on the reverse thereof, a "Warrant Certificate") in substantially the
form of Exhibit A, with such changes, marks of identification or designation,
and such legends, summaries, or endorsements printed thereon as the Company may
deem appropriate and as are not inconsistent with the provisions of this
Agreement, or as may be required to comply with any applicable law or with any
rule or regulation made pursuant thereto. Notwithstanding the foregoing, Warrant
Certificates evidencing Warrants issued as contemplated by clause (a) or clause
(b) of the first sentence of Section 1.1 will not bear restrictive legends.

        1.3. Countersignature of Warrants. The Warrant Certificates will be
executed on behalf of the Company by the manual or facsimile signature of its
Chairman of the Board, President, or any Vice President, and attested by its
Secretary or any Assistant Secretary. The Warrant Certificates will be manually
countersigned by the Warrant Agent and will not be valid for any purpose unless
so countersigned. In case any officer of the Company who has signed any of the
Warrant Certificates ceases to be such officer of the Company before
countersignature by the Warrant Agent and issuance and delivery by the Company,
such Warrant Certificates, nevertheless, may be countersigned by the Warrant
Agent, and issued and delivered by the Company with the same force and effect as
though the person who signed such Warrant Certificates had not ceased to be such
officer of the Company; and any Warrant Certificate may be signed on behalf of
the Company by any person who, at the actual date of the execution of such
Warrant Certificate, is a proper officer of the Company to sign such Warrant
Certificate, although on any other date such person was not such an officer.
Warrant Certificates will be dated the date of countersignature by the Warrant
Agent.

        1.4 Registration of Warrants. The Warrant Agent, on behalf of the
Company, will keep or cause to be kept, at the principal office of the Warrant
Agent designated for such purpose, books for registration and transfer of the
Warrant Certificates issued hereunder by the Company. Such books will show the
names and addresses of the respective holders of the Warrant Certificates, the
number of Warrants evidenced on its face by each of the Warrant Certificates,
and the date of each of the Warrant Certificates. The Company and the Warrant
Agent will be entitled to treat the registered holder of any Warrant Certificate
(the "Holder") as the sole owner of the Warrants represented by such Warrant
Certificate for all purposes and will not be bound to recognize any equitable or
other claim or interest in such Warrants on the part of any other person.
Neither the Company nor the Warrant Agent will be liable for any registration of
transfer of any Warrants that are registered or to be registered in the name of
a fiduciary or the nominee of a fiduciary. 

- -------- 

*To be determined as provided in Schedule II to the Merger Agreement.


                                       -2-
<PAGE>



        2. Transfer and Exchange of Warrants.

        2.1. Transfer and Exchange. Any Warrant Certificate may, except to the
extent otherwise prohibited pursuant to this Agreement, be transferred, split
up, combined, or exchanged for another Warrant Certificate or Warrant
Certificates entitling the Holder thereof to purchase a like aggregate number of
Warrant Shares as the Warrant Certificate or Warrant Certificates surrendered
then entitled such Holder (or former Holder in the case of a transfer) to
purchase. Any Holder desiring to transfer, split up, combine, or exchange any
such Warrant Certificate will make such request in writing delivered to the
Warrant Agent, and will surrender the Warrant Certificate or Warrant
Certificates to be transferred, split up, combined, or exchanged, with the Form
of Assignment duly executed by the Holder thereof, at the principal office of
the Warrant Agent designated for such purpose. Thereupon or as promptly as
practicable thereafter, the Company will prepare, execute, and deliver to the
Warrant Agent, and the Warrant Agent will countersign and deliver, a Warrant
Certificate or Warrant Certificates, as the case may be, as so requested.
Neither the Company nor the Warrant Agent will be required to issue or deliver
any Warrant Certificates in connection with any transfer, split up, combination,
or exchange of Warrants or Warrant Certificates unless and until the person or
persons requesting the issuance or delivery thereof has paid to the Warrant
Agent the amount of any tax or governmental charge that may be payable in
connection with such transfer, split up, combination, or exchange or has
established to the satisfaction of the Warrant Agent that any tax or
governmental charge has been paid. Holders will not be required to pay any other
charge in connection with the transfer, split up, combination, or exchange of
Warrants.

        2.2. Lost, Stolen, and Mutilated Warrant Certificates. Upon receipt by
the Company and the Warrant Agent of evidence reasonably satisfactory to them of
the loss, theft, destruction, or mutilation of a Warrant Certificate, and, in
case of loss, theft, or destruction, of indemnity or security reasonably
satisfactory to them, and reimbursement to the Company and the Warrant Agent of
all reasonable expenses incidental thereto, and upon surrender to the Warrant
Agent and cancellation of the Warrant Certificate if mutilated, the Company will
prepare, execute, and deliver a new Warrant Certificate of like tenor to the
Warrant Agent and the Warrant Agent will countersign and deliver such new
Warrant Certificate to the Holder in lieu of the Warrant Certificate so lost,
stolen, destroyed, or mutilated.

        2.3. Payment of Taxes. The Company will pay all documentary or stamp
taxes, if any, attributable to the initial issuance of the Warrants and the
initial issuance of the Warrant Shares upon the exercise of Warrants; provided,
however, that the Company's obligations in this regard will in all events be
conditioned upon the Holder cooperating with the Company and the Warrant Agent
in any reasonable arrangement designed to minimize or eliminate any such taxes.
Neither the Company nor the Warrant Agent will be required to pay any tax or
governmental charge that may be payable in connection with any transfer, split
up, combination, or exchange of Warrants or Warrant Certificates, and the
Company will not be required to issue or deliver such Warrant Certificates
unless or until the person or persons requesting the issuance thereof has paid
to the


                                       -3-
<PAGE>



Company the amount of such tax or governmental charge or has established to the
satisfaction of the Company that such tax or governmental charge has been paid.

        2.4. Cancellation and Destruction of Warrant Certificates. All Warrant
Certificates surrendered for the purpose of exercise, transfer, split up,
combination, or exchange will, if surrendered to the Company, be delivered to
the Warrant Agent for cancellation or in canceled form, or, if surrendered to
the Warrant Agent, will be canceled by it, and no Warrant Certificates will be
issued in lieu thereof except as expressly permitted by this Agreement. The
Company will deliver to the Warrant Agent for cancellation and retirement, and
the Warrant Agent will so cancel and retire, any other Warrant Certificate
purchased or acquired by the Company otherwise than upon the exercise thereof.
The Warrant Agent will deliver all canceled Warrant Certificates to the Company,
or will, at the written request of the Company, destroy such canceled Warrant
Certificates, and in such case will deliver a certificate of destruction thereof
to the Company.

        3. Duration and Exercise of Warrants.

        3.1. Duration and Exercise of Warrants. (a) Warrants may be exercised by
the Holder thereof, in whole or in part, at any time and from time to time after
the date hereof and prior to 5:00 p.m., New York City time, on September 1, 2001
(the "Expiration Date"); provided that Holders shall be able to exercise their
Warrants only if (i) (A) the Warrant Shares Registration Statement (as defined
in Section 10) is then in effect and the Company has delivered to each person
exercising a Warrant a current prospectus meeting the requirements of the
Securities Act of 1933, as amended (the "Securities Act"), or (B) the exercise
of such Warrants is exempt from the registration requirements of the Securities
Act, and (ii) the Warrant Shares are qualified for sale or exempt from
qualification under the applicable securities laws of the states in which the
Holder of the Warrants to be exercised, and, if applicable, the persons to whom
it is proposed that the Warrant Shares be issued on exercise of the Warrants,
reside. The Holder of Warrants may exercise them by delivering to the Warrant
Agent, at its principal office designated for such purpose, the following:

                 (i) the Warrant Certificate or Warrant Certificates
        representing the Warrants to be exercised, with the Form of Exercise
        Notice duly completed and executed by the Holder thereof; and

                (ii) cash, a certified or bank cashier's check payable to the
        order of the Company, or a wire transfer of immediately available funds
        to an account designated by the Warrant Agent, in each case in an amount
        equal to the product of (A) the number of Warrant Shares purchasable
        upon the exercise of the Warrants designated for exercise in the Form of
        Exercise Notice and (B) the Warrant Price.

        (b) Subject to Section 2.3 hereof, as promptly as practicable after an
exercise of Warrants in accordance with Section 3.1(a), and in any event within
10 Business Days (as defined in Section 3.2) after such exercise, the Warrant
Agent will (i) requisition from any transfer agent


                                       -4-
<PAGE>



for the Common Stock (or make available, if the Warrant Agent is the transfer
agent) certificates representing the number of Warrant Shares to be purchased
(and the Company hereby irrevocably authorizes and directs its transfer agent to
comply with all such requests), (ii) after receipt of such certificates, cause
the same to be delivered to or upon the order of the Holder exercising such
Warrants, registered in such name or names as may be designated by such Holder,
(iii) when appropriate, requisition from the Company the amount of cash to be
paid in lieu of the issuance of fractional Warrant Shares in accordance with the
provisions of Section 5, and (iv) when appropriate, after receipt, deliver such
cash to or upon the order of the Holder exercising such Warrants.

        (c) If the number of Warrants represented by a Warrant Certificate are
not exercised in full, the Company will prepare, execute, and deliver to the
Warrant Agent a new Warrant Certificate evidencing Warrants equivalent to such
Warrants remaining unexercised and the Warrant Agent will countersign and
deliver such new Warrant Certificate to or upon the order of the Holder
exercising such Warrants, registered in such name or names as may be designated
by such Holder.

        (d) The Company will take all such action as may be necessary to ensure
that all Warrant Shares delivered upon exercise of Warrants, at the time of
delivery of the certificates for such Warrant Shares, will (subject to payment
of the Warrant Price) be duly and validly authorized and issued, fully paid, and
nonassessable and, if shares of Common Stock are then listed on any national
securities exchange (as defined in the Securities Exchange Act of 1934, as
amended (the "Exchange Act")) or qualified for quotation on The Nasdaq Stock
Market, will be duly listed or qualified for quotation thereon, as the case may
be.

        (e) In the event that the Company is obligated to pay cash in lieu of
fractional Warrant Shares pursuant to Section 5 in connection with any exercise
of Warrants, it will make all arrangements necessary so that such cash is
available for distribution by the Warrant Agent, if and when appropriate.

        (f) The Company will pay all expenses, taxes, and other charges payable
in connection with the preparation, issuance, and delivery of certificates
representing Warrant Shares or Warrant Certificates representing unexercised
Warrants in connection with any exercise of Warrants in accordance with Section
3.1(a), except that, if any such certificates representing Warrant Shares or any
such Warrant Certificates are to be registered in a name or names other than
that of the Holder at the time of any such exercise of Warrants, funds
sufficient to pay all transfer or similar taxes payable as a result of such
transfer shall be paid by the Holder at the time of such exercise or promptly
upon receipt of a written request of the Company for payment thereof. In
connection with any exercise of Warrants in accordance with Section 3.1(a), the
Warrants will be deemed to have been exercised, any certificate representing
Warrant Shares or any Warrant Certificate issued on account thereof will be
deemed to have been issued, and the person in whose name any such certificate or
Warrant Certificate is issued will be deemed for all


                                       -5-
<PAGE>



purposes to have become a Holder of record of the Warrant Shares or Warrants, as
the case may be, represented thereby as of the date of such exercise.

        3.2. Certain Definitions. For purposes of this Agreement, (a) the term
"Business Day" means any day other than a Saturday, Sunday, or a day on which
banking institutions in the state of New York are authorized or obligated by law
or executive order to close and (b) the term "Trading Day" means any day on
which shares of Common Stock are traded on the principal national securities
exchange on which the shares of Common Stock are listed or admitted to trading
or, if shares of Common Stock are not so listed or admitted to trading, in the
over-the-counter market.

        4. Adjustments of Warrant Price and Warrant Shares. The Warrant Price
and the number and kind of Warrant Shares purchasable upon exercise of the
Warrants will be subject to adjustment from time to time upon the occurrence of
certain events as provided in this Section 4.

        4.1. Mechanical Adjustments. The Warrant Price and the number and kind
of Warrant Shares purchasable upon exercise of a Warrant will be subject to
adjustment as follows:

               (a) Subject to Section 4.1(e), if the Company (i) pays a dividend
        or otherwise distributes to holders of its Common Stock, as such, shares
        of its capital stock (whether Common Stock or capital stock of any other
        class), (ii) subdivides its outstanding shares of Common Stock into a
        greater number of shares of Common Stock, (iii) combines its outstanding
        shares of Common Stock into a smaller number of shares of Common Stock,
        or (iv) issues any shares of its capital stock in a reclassification of
        its outstanding shares of Common Stock (including any such
        reclassification in connection with a consolidation, merger, or other
        business combination transaction in which the Company is the continuing
        or surviving corporation), then the number and kind of Warrant Shares
        purchasable upon exercise of each Warrant immediately prior thereto will
        be adjusted so that the Holder of each Warrant will be entitled to
        receive (A) in the case of a dividend or distribution, the sum of (1)
        the number of Warrant Shares that, if such Warrant had been exercised
        immediately prior to such adjustment, such Holder would have received
        upon such exercise and (2) the number and kind of additional shares of
        capital stock that such Holder would have been entitled to receive as a
        result of such dividend or distribution by virtue of its ownership of
        such Warrant Shares, (B) in the case of a subdivision or combination,
        the number of Warrant Shares that, if such Warrant had been exercised
        immediately prior to such adjustment, such Holder would have received
        upon such exercise, adjusted to give effect to such subdivision or
        combination as if such Warrant Shares had been subject thereto, or (C)
        in the case of an issuance in a reclassification, the sum of (1) the
        number of Warrant Shares that, if such Warrant had been exercised
        immediately prior to such adjustment, such Holder would have received
        upon such exercise and retained after giving effect to such
        reclassification as if such Warrants Shares had been subject thereto and
        (2) the number and kind of additional shares of capital stock that such
        Holder would have been entitled to receive as a result of such
        reclassification as if such Warrant Shares had


                                       -6-
<PAGE>



        been subject thereto. An adjustment made pursuant to this paragraph (a)
        will become effective immediately after the record date for the
        determination of stockholders entitled to receive such dividend or
        distribution in the case of a dividend or distribution and will become
        effective immediately after the effective date of such subdivision,
        combination, or reclassification in the case of a subdivision,
        combination, or reclassification. If, after an adjustment, a Holder of a
        Warrant upon exercise of it may receive shares of two or more classes of
        capital stock of the Company, the Company shall determine the allocation
        of the adjusted Warrant Price between the classes of capital stock.
        After such allocation, the exercise privilege and the Warrant Price of
        each class of capital stock shall thereafter be subject to adjustments
        as nearly equivalent as may be practicable to the adjustments provided
        for Common Stock in this Section 4. Such adjustments shall be made
        successively whenever any event listed above shall occur.

               (b) Subject to Section 4.1(e), if the Company distributes to
        holders of its Common Stock, as such, (i) evidences of indebtedness or
        assets (excluding regular cash dividends or cash distributions payable
        out of consolidated retained earnings) of the Company or any corporation
        or other legal entity a majority of the voting equity securities or
        equity interests of which are owned, directly or indirectly, by the
        Company (a "Subsidiary"), (ii) shares of capital stock of any
        Subsidiary, (iii) securities convertible into or exchangeable for
        capital stock of the Company (including Common Stock or capital stock of
        any other class) or any Subsidiary, or (iv) any rights, options, or
        warrants to purchase any of the foregoing (excluding those described in
        Section 4.1(c)), then the number of Warrant Shares thereafter
        purchasable upon exercise of each Warrant will be adjusted to the number
        that results from multiplying the number of Warrant Shares purchasable
        upon the exercise of each Warrant immediately prior to such adjustment
        by a fraction, the numerator of which will be the Current Market Price
        per share (as defined in Section 4.1(d)) of Common Stock on the record
        date for such distribution, and the denominator of which will be such
        Current Market Price per share of Common Stock less the fair value (as
        determined in good faith by the Board of Directors of the Company, whose
        determination will be conclusive if based on the financial advice of a
        nationally recognized investment banking firm) of the portion of the
        evidences of indebtedness, assets, securities, or rights, options, or
        warrants so distributed on account of one share of Common Stock. Such
        adjustment will be made whenever any such distribution is made, and will
        become effective immediately after the record date for the determination
        of stockholders entitled to receive such distribution. Except as
        provided in Section 4.1(h), no further adjustments of the number of
        Warrant Shares will be made upon the actual issue of shares of Common
        Stock upon conversion or exchange of such securities convertible or
        exchangeable for shares of Common Stock or upon exercise of such rights,
        warrants, or options for shares of Common Stock.

               (c) Subject to Section 4.1(e), if the Company issues rights,
        options, or warrants to holders of the outstanding shares of Common
        Stock, as such, entitling the holders of such rights, options, or
        warrants (for a period expiring within 60 calendar days


                                       -7-
<PAGE>



        after the record date mentioned below) to subscribe for or purchase
        shares of Common Stock at a price per share that is lower on the record
        date mentioned below than the Current Market Price per share of Common
        Stock on such record date, then the number of Warrant Shares thereafter
        purchasable upon the exercise of each Warrant will be adjusted to the
        number that results from multiplying the number of Warrant Shares
        purchasable upon exercise of each Warrant immediately prior to such
        adjustment by a fraction (not to be less than one), the numerator of
        which will be the number of shares of Common Stock outstanding on such
        record date plus the number of additional shares of Common Stock offered
        by such rights, options, or warrants for subscription or purchase and
        the denominator of which will be the number of shares of Common Stock
        outstanding on such record date plus the number of shares of Common
        Stock which the aggregate subscription or purchase price of the total
        number of shares of Common Stock so offered would purchase at the
        Current Market Price per share of Common Stock on such record date. Such
        adjustment will be made whenever such rights, options, or warrants are
        issued, and will become effective immediately after the record date for
        the determination of stockholders entitled to receive such rights,
        options, or warrants. In case such subscription or purchase price may be
        paid in a consideration part or all of which is in a form other than
        cash, the fair value of such consideration will be as determined by the
        Board of Directors of the Company, whose determination will be
        conclusive if based on the financial advice of a nationally recognized
        investment banking firm. Except as provided in Section 4.1(h), no
        further adjustments of the number of Warrant Shares will be made upon
        the actual issue of shares of Common Stock upon exercise of such rights,
        options, or warrants.

               (d) For purposes of this Agreement, the "Current Market Price"
        per share of Common Stock on any date will be the average of the daily
        Closing Prices (as defined below in this Section 4.1(d)) for 30
        consecutive Trading Days commencing 45 Trading Days before the date of
        such computation. The closing price for each day (the "Closing Price")
        will be the last reported sales price regular way or, in case no such
        reported sale takes place on such day, the average of the closing bid
        and asked prices regular way for such day, in each case on the principal
        national securities exchange on which the shares of Common Stock are
        listed or admitted to trading or, if not so listed or admitted to
        trading, the average of the closing bid and asked prices of the shares
        of Common Stock in the over-the-counter market as reported by The Nasdaq
        Stock Market or any comparable system, or if not so reported by any such
        organization on such day, the average of the bid and asked prices
        furnished by a professional market maker selected by the Board of
        Directors of the Company. In the absence of one or more such quotations,
        the Board of Directors of the Company will determine the Current Market
        Price in good faith on the basis of such quotations or other relevant
        information as it considers appropriate.

               (e) No adjustment in the number of Warrant Shares purchasable
        upon the exercise of a Warrant will be required unless such adjustment
        would require an increase or decrease in the number of Warrant Shares
        purchasable upon the hypothetical exercise of a


                                       -8-
<PAGE>



        Warrant of at least 1%; provided, however, that any adjustments which by
        reason of this paragraph (e) are not required to be made currently will
        be carried forward and made at the time and together with the next
        subsequent adjustment which, together with any adjustments so carried
        forward, would require an increase or decrease in the number of Warrant
        Shares purchasable upon the hypothetical exercise of a Warrant of 1% or
        more. All calculations with respect to the number of Warrant Shares will
        be made to the nearest one-thousandth of a share and all calculations
        with respect to the Warrant Price will be to the nearest whole cent. No
        adjustment in the number of Warrant Shares purchasable upon the exercise
        of a Warrant will be made under paragraph (b) or (c) of this Section 4.1
        if the Company issues or distributes to each Holder the shares, rights,
        options, warrants, convertible or exchangeable securities, evidences of
        indebtedness, assets, or other securities referred to in the applicable
        paragraph that such Holder would have been entitled to receive had the
        Warrants been exercised prior to the happening of such event on the
        record date with respect thereto (provided that, in any case in which
        such Holder would have been so entitled to receive a fractional interest
        in any such securities or assets, the Company may distribute to such
        Holder in lieu of such fractional interest cash in an amount equal to
        the fair value of such fractional interest as determined in good faith
        by the Board of Directors of the Company). No adjustment in the number
        of Warrant Shares will be made for a change in the par value of the
        shares of Common Stock.

               (f) Whenever the number of Warrant Shares purchasable upon the
        exercise of each Warrant is adjusted as herein provided, the Warrant
        Price will be adjusted by multiplying the Warrant Price in effect
        immediately prior to such adjustment by a fraction, the numerator of
        which will be the number of Warrant Shares purchasable upon the exercise
        of each Warrant immediately prior to such adjustment, and the
        denominator of which will be the number of Warrant Shares so purchasable
        immediately thereafter.

               (g) For the purpose of this Agreement, the term "Common Stock"
        means (i) the class of shares designated as the Common Stock of the
        Company as of the date of this Agreement, (ii) all shares of any class
        or classes (however designated) of the Company, now or hereafter
        authorized, the holders of which have the right, without limitation as
        to amount, either to all or to a part of the balance of current
        dividends and liquidating dividends after the payment of dividends and
        distributions on any shares entitled to preference, and the holders of
        which are ordinarily entitled to vote generally in the election of
        directors of the Company, or (iii) any other class of shares resulting
        from successive changes or reclassifications of such shares consisting
        solely of changes in par value, or from par value to no par value, or
        from no par value to par value. In the event that at any time, as a
        result of an adjustment made pursuant to Section 4.1(a), the Warrants
        become exercisable to purchase Warrant Shares other than shares of
        Common Stock, thereafter the number of such other shares so purchasable
        upon exercise of each Warrant and the Warrant Price payable in respect
        of such other shares upon the exercise of each Warrant will be subject
        to adjustment from time to time in a manner and on terms


                                       -9-
<PAGE>



        as nearly equivalent as practicable to the provisions with respect to
        the Warrant Shares and the Warrant Price contained in this Section 4.1.

               (h) Upon the expiration of any rights, options, warrants, or
        conversion or exchange privileges, if any thereof have not been
        exercised, the Warrant Price and the number of Warrant Shares
        purchasable upon the exercise of each Warrant will, upon such
        expiration, be readjusted and will thereafter be such as it would have
        been had it been originally adjusted (or had the original adjustment not
        been required, as the case may be) as if (i) the only shares of Common
        Stock so issued were the shares of Common Stock, if any, actually issued
        or sold upon the exercise of such rights, options, warrants, or
        conversion or exchange rights and (ii) such shares of Common Stock, if
        any, were issued or sold for the consideration actually received by the
        Company upon such exercise, conversion, or exchange plus the aggregate
        consideration, if any, actually received by the Company for the
        issuance, sale, or grant of all such rights, options, warrants, or
        conversion or exchange rights whether or not exercised; provided,
        however, that no such readjustment will have the effect of increasing
        the Warrant Price or decreasing the number of Warrant Shares purchasable
        upon the exercise of each Warrant by an amount in excess of the amount
        of the adjustment initially made in respect of the issuance, sale, or
        grant of such rights, options, warrants, or conversion or exchange
        privileges.

        4.2. Notice of Adjustment. Whenever the Warrant Price or the number or
kind of Warrant Shares purchasable upon exercise of the Warrants is adjusted
pursuant to any of the provisions of this Agreement, the Company will promptly
give notice to the Holders of such adjustment or adjustments, together with a
certificate of a firm of independent public accountants selected by the Company
(who may be the regular accountants employed by the Company) setting forth the
adjustments in the Warrant Price and the number or kind of Warrant Shares
purchasable upon exercise of each Warrant, and also setting forth a brief
statement of the facts requiring such adjustments and the computations upon
which such adjustments are based. Such certificate will be conclusive evidence
of the correctness of such adjustments.

        4.3. No Adjustment for Dividends. Except as provided in Section 4.1, no
adjustment or payment in respect of any dividends will be made at any time.

        4.4 Voluntary Reduction. The Company from time to time may reduce the
Warrant Price by any amount for any period of time, if the period is at least 20
calendar days and if the reduction is irrevocable during the period; provided
that in no event may the Warrant Price be less than the par value of the Common
Stock. Whenever the Warrant Price is so reduced, the Company will mail to
Holders a notice of the reduction at least 15 calendar days before the date the
reduced Warrant Price takes effect. Such notice will state the reduced Warrant
Price and the period during which it will be in effect. Failure to mail the
notice or any defect therein will not affect the legality or validity of the
reduction. A reduction of the Warrant Price does not change or adjust the
Warrant Price otherwise in effect for purposes of Section 4.1.



                                      -10-
<PAGE>



        4.5. Preservation of Purchase Rights Upon Merger, Consolidation, Etc. In
case of any consolidation, merger, or other business combination transaction in
which the Company is not the continuing or surviving corporation, or in case of
any sale, transfer, or lease to another corporation of all or substantially all
the property of the Company, the Company and such successor or purchasing
corporation, as the case may be, will execute an agreement providing that each
Holder will have the right thereafter, upon payment of an amount equal to the
amount payable upon the exercise of a Warrant immediately prior thereto, to
purchase upon exercise of each Warrant the kind and amount of securities or
property that it would have owned or have been entitled to receive after giving
effect to such consolidation, merger, sale, transfer, or lease on account of the
Warrant Shares that would have been purchasable upon the exercise of such
Warrant had such Warrant been exercised immediately prior thereto (provided
that, to the extent that such Holder would have been so entitled to receive cash
on account of such Warrant Shares, such Holder may elect in connection with the
exercise of a Warrant in accordance with Section 3.1 to reduce the amount of
cash that it would be entitled to receive upon such exercise in exchange for a
corresponding reduction in the amount payable upon such exercise); provided,
however, that no adjustment in respect of dividends, interest, or other income
on or from such shares or other securities or property will be made during the
term of a Warrant or upon the exercise of a Warrant. Such agreement will provide
for adjustments that will be as nearly equivalent as may be practicable to the
adjustments provided for in this Section 4. The provisions of this Section 4.5
will similarly apply to successive consolidations, mergers, sales, transfers, or
leases.

        4.6. Warrant Certificates. Whether or not any adjustments in the Warrant
Price or the number or kind of Warrant Shares purchasable upon the exercise of
the Warrants has been made, Warrant Certificates theretofore or thereafter
issued may continue to express the same Warrant Price and number and kind of
Warrant Shares as are stated in the Warrant Certificate initially issued.

        5. Fractional Interests. Neither the Company nor the Warrant Agent will
be required to issue fractional Warrant Shares or fractional interests in any
other securities upon the exercise of the Warrants. If any fraction of a Warrant
Share or other security would, except for the provisions of this Section 5, be
issuable upon the exercise of the Warrants, the Company will pay an amount
(computed to the nearest cent) in cash (a) in lieu of a fractional Warrant
Share, equal to the Current Market Price for one share of Common Stock, as
defined in Section 4.1(d), on the Trading Day immediately preceding the date on
which the Warrants are presented for exercise, multiplied by such fraction of a
Warrant Share or (b) in lieu of a fractional interest in any other security,
equal to the fair value of such fractional interest, determined in a manner as
similar as possible, taking into account the difference in the fractional
interest being valued, to the calculation described in the foregoing clause (a).



                                      -11-
<PAGE>



        6.  Warrant Agent Matters.

        6.1. Appointment of Warrant Agent. The Company hereby appoints the
Warrant Agent to act as warrant agent in accordance with the terms and
conditions hereof, and the Warrant Agent hereby accepts such appointment.

        6.2. Concerning the Warrant Agent. (a) The Company will pay to the
Warrant Agent reasonable compensation for all services rendered by it hereunder
and will reimburse the Warrant Agent for its reasonable expenses and counsel
fees and other disbursements incurred in the administration and execution of
this Agreement and the exercise and performance of its duties hereunder. The
Company will indemnify the Warrant Agent for, and hold it harmless against, any
loss, liability, suit, action, proceeding, or expense, incurred without
negligence, bad faith, or willful misconduct on the part of the Warrant Agent,
for anything done or omitted by the Warrant Agent in connection with the
acceptance and administration of this Agreement, including the costs and
expenses of defending against any claim of liability arising therefrom, directly
or indirectly.

        (b) The Warrant Agent will incur no liability to the Company or to any
Holder for or in respect of any action taken, suffered, or omitted by it in
connection with its administration of this Agreement in reliance upon any
Warrant Certificate or certificate evidencing Common Stock or other securities
of the Company, instrument of assignment or transfer, power of attorney,
endorsement, affidavit, letter, notice, direction, consent, certificate,
statement, or other paper or document believed by it to be genuine and to be
signed, executed, and, where necessary, verified or acknowledged, by the proper
person or persons.

        6.3. Merger or Consolidation or Change of Name of Warrant Agent. (a) Any
corporation into which the Warrant Agent or any successor Warrant Agent may be
merged or with which it may be consolidated, or any corporation resulting from
any merger or consolidation to which the Warrant Agent or any successor Warrant
Agent is a party, or any corporation succeeding to the corporate trust business
of the Warrant Agent or any successor Warrant Agent, will be the successor to
the Warrant Agent under this Agreement without the execution or filing of any
paper or any further act on the part of any of the parties hereto, provided that
such corporation would be eligible for appointment as a successor Warrant Agent
under the provisions of Section 6.5. In case at the time such successor to the
Warrant Agent shall succeed to the agency created by this Agreement, and in case
at that time any of the Warrant Certificates shall have been countersigned but
not delivered, any such successor to the Warrant Agent may adopt the
countersignature of the original Warrant Agent; and in case at that time any of
the Warrant Certificates shall not have been countersigned, any successor to the
Warrant Agent may countersign such Warrant Certificates either in the name of
the predecessor Warrant Agent or in the name of the successor to the Warrant
Agent; and in all such cases such Warrant Certificates shall have the full force
and effect provided in the Warrant Certificates and in this Agreement.

        (b) In case at any time the name of the Warrant Agent shall be changed
and at such time any of the Warrant Certificates shall have been countersigned
but not delivered, the Warrant


                                      -12-
<PAGE>



Agent whose name has been changed may adopt the countersignature under its prior
name, and in case at that time any of the Warrant Certificates shall not have
been countersigned, the Warrant Agent may countersign such Warrant Certificates
either in its prior name or in its changed name, and in all such cases such
Warrant Certificates shall have the full force and effect provided in the
Warrant Certificates and in this Agreement.

        6.4. Duties of Warrant Agent. The Warrant Agent undertakes the duties
and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the Holders, by their acceptance of
Warrant Certificates, will be bound:

        (a) The Warrant Agent may consult with legal counsel (who may be legal
counsel for the Company), and the opinion of such counsel will be full and
complete authorization and protection to the Warrant Agent as to any action
taken or omitted by it in good faith and in accordance with such opinion.

        (b) Whenever in the performance of its duties under this Agreement the
Warrant Agent deems it necessary or desirable that any fact or matter be proved
or established by the Company prior to taking or suffering any action hereunder,
such fact or matter (unless other evidence in respect thereof be herein
specifically prescribed) may be deemed to be conclusively proved and established
by a certificate signed by any one of the Chairman of the Board, the President,
or any Vice President of the Company and delivered to the Warrant Agent; and
such certificate will be full authorization to the Warrant Agent for any action
taken or suffered in good faith by it under the provisions of this Agreement in
reliance upon such certificate.

        (c) The Warrant Agent's duties will be determined solely by the
provisions hereof. The Warrant Agent will not be liable for anything that it may
do or refrain from doing in connection with this Agreement except for its own
negligence, bad faith, or willful misconduct; provided, however, that the
Warrant Agent shall not be liable for any indirect, special, punitive or
consequential damages.

        (d) The Warrant Agent will not be liable for or by reason of any of the
statements of fact or recitals contained in this Agreement or in the Warrant
Certificates or be required to verify the same, but all such statements and
recitals are and will be deemed to have been made by the Company only.

        (e) The Warrant Agent will not be under any responsibility in respect of
the validity of this Agreement or the execution and delivery hereof (except the
due execution and delivery hereof by the Warrant Agent) or in respect of the
validity or execution of any Warrant Certificate (except the due
countersignature thereof by the Warrant Agent); nor will it be responsible for
any breach by the Company of any covenant or condition contained in this
Agreement or in any Warrant Certificate; nor will it be responsible for any
adjustment required under the provisions of Section 4 hereof or responsible for
the manner, method, or amount of any such adjustment or the ascertaining of the
existence of facts that would require any such adjustment (except with respect


                                      -13-
<PAGE>



to the exercise of Warrants evidenced by Warrant Certificates after actual
notice of any such adjustment); nor will it by any act hereunder be deemed to
make any representation or warranty as to the authorization or reservation of
any shares of stock or other securities to be issued pursuant to this Agreement
or any Warrant Certificate or as to whether any shares of stock or other
securities will, when issued, be validly authorized and issued, fully paid, and
nonassessable.

        (f) The Company will perform, execute, acknowledge, and deliver or cause
to be performed, executed, acknowledged, and delivered all such further and
other acts, instruments, and assurances as may reasonably be required by the
Warrant Agent for the carrying out or performing by the Warrant Agent of the
provisions of this Agreement.

        (g) The Warrant Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
one of the Chairman of the Board, the President, or any Vice President of the
Company, and to apply to such officers for advice or instructions in connection
with its duties, and it will not be liable for any action taken or suffered to
be taken by it in good faith in accordance with instructions of any such
officer.

        (h) The Warrant Agent and any stockholder, director, officer, or
employee of the Warrant Agent may buy, sell, or deal in any of the Warrants or
other securities of the Company or become pecuniarily interested in any
transaction in which the Company may be interested, or contract with or lend
money to the Company or otherwise act as fully and freely as though it were not
Warrant Agent under this Agreement. Nothing herein will preclude the Warrant
Agent from acting in any other capacity for the Company or for any other legal
entity.

        (i) The Warrant Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder either itself or by or
through its attorneys or agents, and the Warrant Agent will not be answerable or
accountable for any act, default, neglect, or misconduct of any such attorneys
or agents or for any loss to the Company resulting from any such act, default,
neglect, or misconduct, provided reasonable care was exercised in the selection
and continued employment thereof. The Warrant Agent will not be under any duty
or responsibility to insure compliance with any applicable federal or state
securities laws in connection with the issuance, transfer, or exchange of
Warrant Certificates.

        6.5. Change of Warrant Agent. The Warrant Agent or any successor Warrant
Agent may resign and be discharged from its duties under this Agreement upon 30
calendar days' notice in writing mailed to the Company and to each transfer
agent of the Common Stock by registered or certified mail, and to the Holders by
first-class mail. The Company may remove the Warrant Agent or any successor
Warrant Agent upon 30 calendar days' notice in writing, mailed to the Warrant
Agent or successor Warrant Agent, as the case may be, and to each transfer agent
of the Common Stock by registered or certified mail, and to the Holders by
first-class mail. If the Warrant Agent resigns or is removed or otherwise
becomes incapable of acting, the Company will appoint a successor to the Warrant
Agent. If the Company fails to make such appointment within a period of 30
calendar days after giving notice of such removal or after it has been notified
in


                                      -14-
<PAGE>



writing of such resignation or incapacity by the resigning or incapacitated
Warrant Agent or by any Holder (who will, with such notice, submit his Warrant
Certificate for inspection by the Company), then any Holder may apply to any
court of competent jurisdiction for the appointment of a successor Warrant
Agent. Pending appointment of a successor to such Warrant Agent, either by the
Company or by such a court, the duties of the Warrant Agent will be carried out
by the Company. Any successor Warrant Agent, whether appointed by the Company or
by such a court, will be a corporation organized and doing business under the
laws of the United States or of the State of New York (or of any other state of
the United States so long as such corporation is authorized to do business as a
banking institution in the State of New York), in good standing, having a
principal office in the State of New York, which is authorized under such laws
to exercise corporate trust powers and is subject to supervision or examination
by federal or state authority and which has at the time of its appointment as
Warrant Agent a combined capital and surplus of at least $50 million. After
appointment, the successor Warrant Agent will be vested with the same powers,
rights, duties, and responsibilities as if it had been originally named as
Warrant Agent without further act or deed; but the predecessor Warrant Agent
will deliver and transfer to the successor Warrant Agent any property at the
time held by it hereunder, and execute and deliver any further assurance,
conveyance, act, or deed necessary for the purpose. Not later than the effective
date of any such appointment, the Company will file notice thereof in writing
with the predecessor Warrant Agent and each transfer agent of the Common Stock,
and mail by first class mail a notice thereof to each Holder. Failure to give
any notice provided for in this Section 6.5, however, or any defect therein,
will not affect the legality or validity of the resignation or removal of the
Warrant Agent or the appointment of the successor Warrant Agent, as the case may
be.

        7.1 No Rights as a Stockholder; Notices to Holders. Nothing contained in
this Agreement or in the Warrant Certificate will be construed as conferring
upon the Holders or their transferees the right to vote, or to receive
dividends, or to consent or to receive notice as a stockholder in respect of any
meeting of stockholders for the election of directors of the Company or any
other matter, or any rights whatsoever as a stockholder of the Company;
provided, however, that if, at any time prior to the Expiration Date and prior
to the exercise of all of the Warrants, any of the following events occur:

               (a) The Company declares any dividend payable in any securities
        upon its shares of Common Stock or makes any distribution (other than a
        regular cash dividend payable out of consolidated retained earnings) to
        the holders of its shares of Common Stock;

               (b) The Company offers to the holders of its Common Stock any
        shares of capital stock of the Company or any Subsidiary or securities
        convertible into or exchangeable for shares of capital stock of the
        Company or any Subsidiary or any option, right, or warrant to subscribe
        for or purchase any thereof;



                                      -15-
<PAGE>



               (c) The Company distributes to the holders of its Common Stock
        evidences of indebtedness or assets (including any cash dividend which
        would result in an adjustment under Section 4.1) of the Company or any
        Subsidiary;

               (d) Any reclassification of the Common Stock, any consolidation
        of the Company with or merger of the Company into another corporation,
        any sale, transfer, or lease to another corporation of all or
        substantially all the property of the Company, or any proposal of the
        Company to effect any of the foregoing transactions that has been
        publicly announced by the Company; or

               (e) Any proposal by the Company to effect a dissolution,
        liquidation, or winding up of the Company that has been publicly
        announced by the Company;

then in any one or more of such events the Company will give notice of such
event to the Holders, as provided in Section 12 hereof, such giving of notice to
be completed at least 10 business days prior to the date fixed as a record date
or the date of closing the transfer books for the determination of the
stockholders entitled to such dividend, distribution, or subscription rights or
at least 20 business days prior to the date fixed as a record date or the date
of closing the transfer books for the determination of stockholders entitled to
vote on such proposed reclassification, consolidation, merger, sale, transfer,
or lease, dissolution, liquidation, or winding up. Such notice will specify such
record date or the date of closing the transfer books, as the case may be, for
such event. Failure to mail or receive such notice or any defect therein or in
the mailing thereof will not affect the validity of any action taken in
connection with such event.

        7.2. Reports to Holders. The Company will deliver to the Warrant Agent,
within 15 calendar days after it files them with the Securities and Exchange
Commission (the "SEC"), copies of its annual report and of the information,
documents, and other reports (or copies of such portions of any of the foregoing
as the SEC may by rules and regulations prescribe) that the Company is required
to file with the SEC pursuant to Section 13 or 15(d) of the Exchange Act. To the
extent any such information, documents, or other reports are required to be sent
by the Company to the holders of outstanding Common Stock, the Company will
simultaneously send copies thereof to the Holders of Warrants. The Warrant Agent
will provide to any Holder promptly upon request a copy of any document
delivered to the Warrant Agent by the Company pursuant to this Section 7.2.

        7.3. Agreements Respecting Warrants. The Company will not enter into any
agreement or instrument which would preclude the exercise of the Warrants as
herein provided.

        8. Agreement of Warrant Holders. Every Holder by accepting a Warrant
Certificate consents and agrees with the Company and the Warrant Agent and with
every other Holder that:



                                      -16-
<PAGE>



        (a) The Warrant Certificates are transferable only in accordance with
the terms of this Agreement and only on the registry books of the Warrant Agent
if surrendered at the principal office of the Warrant Agent designated for such
purpose, duly endorsed or accompanied by a proper instrument of transfer, and
otherwise in compliance with Section 2;

        (b) The Company and the Warrant Agent may deem and treat the person in
whose name the Warrant Certificate is registered as the absolute owner thereof
and of the Warrants evidenced thereby (notwithstanding any notations of
ownership or writing on the Warrant Certificate made by anyone other than the
Company or the Warrant Agent) for all purposes whatsoever, and neither the
Company nor the Warrant Agent will be affected by any notice to the contrary;

        (c) Such Holder expressly waives any right to receive any fractional
Warrants and any fractional securities upon exercise or exchange of a Warrant;
and

        (d) Notwithstanding anything in this Agreement to the contrary, neither
the Company nor the Warrant Agent will have any liability to any Holder or other
person as a result of its inability to perform any of its obligations under this
Agreement by reason of any preliminary or permanent injunction or other order,
decree, or ruling issued by a court of competent jurisdiction or by a
governmental, regulatory, or administrative agency or commission, or any
statute, rule, regulation, or executive order promulgated or enacted by any
governmental authority, prohibiting or otherwise restraining performance of such
obligation; provided, however, that the Company will use reasonable efforts to
have any such order, decree, or ruling lifted or otherwise overturned as soon as
possible.

        9. Reservation of Common Stock. The Company will, for so long as
Warrants remain outstanding, reserve and keep available, solely for issuance and
delivery upon the exercise of Warrants, a number of shares of Common Stock (or,
if applicable, other securities) sufficient to provide for the exercise of all
outstanding Warrants. The transfer agent for the Common Stock (or, if
applicable, other securities) will be irrevocably authorized and directed at all
times until the exercise or expiration of the Warrants to reserve such number of
authorized shares of Common Stock (or, if applicable, other securities) as
necessary for such purpose. The Company will keep copies of this Agreement on
file with the transfer agent and will supply the transfer agent with duly
executed stock certificates for such purpose.

        10. Listing and Registration. (a) The [Warrants and the]* Warrant Shares
have been listed for trading on the Nasdaq National Market, and the Company will
use its reasonable best efforts to maintain such listing. [In addition, the
Company will use its reasonable best efforts to secure and maintain the listing
of the Warrants on the Nasdaq National Market.]*

- --------

*The language in this section is bracketed because the language to be included
in the definitive agreement depends upon whether the Warrants will have been
listed as of the date of the definitive agreement.


                                      -17-
<PAGE>



        (b) The Warrants issued as contemplated by clauses (a) and (b) of the
first sentence of Section 1.1 have been registered for public distribution under
the Securities Act pursuant to a registration statement (No. 333-___________)
filed by the Company with the SEC. The Warrant Shares have been registered for
public distribution upon exercise of the Warrants under the Securities Act
pursuant to registration statement (No. 333-________________) (together with any
amendments thereto, the "Warrant Shares Registration Statement") filed by the
Company with the SEC. Subject to Black Out Periods (as defined below in this
Section 10(b)), the Company will use its reasonable best efforts to keep the
Warrant Shares Registration Statement continuously effective under the
Securities Act until the expiration or exercise of all Warrants in order to
permit the prospectus included therein to be lawfully delivered by the Company
to the Holders exercising such Warrants and by Holders of such Warrants to
prospective purchasers of such Warrants. Notwithstanding the foregoing, the
Company shall not be required to amend or supplement the Warrant Shares
Registration Statement, any related prospectus or any document incorporated
therein by reference for a period (a "Black Out Period"), beginning on the date
the Company gives notice (the "Black Out Notice") to the Warrant Agent and the
Holders that such a period has commenced and ending on the earlier of (i) the
date the information responsible for the Black Out Period is disclosed to the
public and (ii) 60 calendar days after any such Black Out Notice is given, in
the event that (A) an event occurs and is continuing as a result of which the
Warrant Shares Registration Statement, any related prospectus, or any document
incorporated therein by reference as then amended or supplemented would, in the
Company's good faith judgment, contain an untrue statement of a material fact or
omit to state a material fact necessary in order to make the statements therein,
in light of the circumstances under which they were made, not misleading, and
(B) (1) the Company determines in its good faith judgment that the disclosure of
such event at such time would have a material adverse effect on the business,
operations, or prospects of the Company or (2) the disclosure otherwise relates
to a material business transaction, including without limitation any bona fide
financing plan, that has not yet been publicly disclosed; provided, however,
that (x) no Black Out Period may be in effect during the six months immediately
prior to the Expiration Date, (y) there shall be no more than two Black Out
Periods during any period of 180 consecutive calendar days, and (z) there shall
be no more than three Black Out Periods during the term of the Warrants.

        (c) The Company will cause any amendment or supplement to the Warrant
Shares Registration Statement or the related prospectus, as of the effective
date of the Warrant Shares Registration Statement, amendment, or supplement, (i)
to comply in all material respects with the applicable requirements of the
Securities Act and the rules and regulations of the SEC and (ii) not to contain
any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading.

        (d) The Company will give prompt written notice to the Warrant Agent and
the Holders of (i) the effectiveness of any post-effective amendment to the
Warrant Shares Registration Statement, (ii) the issuance by the SEC of any stop
order suspending the effectiveness of the Warrant Shares Registration Statement
or the initiation or threatening of any


                                      -18-
<PAGE>



proceedings for that purpose, (iii) the receipt by the Company or its legal
counsel of any notification with respect to the suspension of the qualification
of the Warrant Shares for sale in any jurisdiction or the initiation or
threatening of any proceeding for such purpose, (iv) the happening of any event
that requires the Company to make changes in the Warrant Shares Registration
Statement or the related prospectus in order to make the statements therein not
misleading, and (v) the commencement and termination of any Black Out Period.

        (e) The Company will use its reasonable best efforts to prevent the
issuance or obtain the withdrawal at the earliest possible time of any order
suspending the effectiveness of the Warrant Shares Registration Statement.

        (f) Upon the occurrence of any event contemplated by Section 10(d)(iv)
hereof or, if any such event occurs during a Black Out Period, upon the
termination of such Black Out Period, the Company will promptly prepare and file
a post-effective amendment to the Warrant Shares Registration Statement or a
supplement to the related prospectus or file any other required document so
that, as thereafter delivered to Holders of Warrants, such prospectus will not
contain an untrue statement of a material fact or omit to state any material
fact necessary to make the statements therein, in light of the circumstances
under which they were made, not misleading and will contain the current
information required by the Securities Act.

        (g) The Company will comply with all applicable rules and regulations of
the SEC and will make generally available to its securities holders (or
otherwise provide in accordance with Section 11(a) of the Securities Act) an
earnings statement satisfying the provisions of Section 11(a) of the Securities
Act, no later than 45 days (plus any extension permitted by Rule 12b-25 under
the Exchange Act after the end of a 12-month period (or 90 days, if such period
is a fiscal year (plus any extension permitted by Rule 12b-25 under the Exchange
Act)) beginning with the first month of the Company's first fiscal quarter
commencing after the effective date of the Registration Statement, which
statement shall cover such 12-month period.

        (h) The Company will register or qualify or cooperate with the Holders
in connection with the registration or qualification of the Warrant Shares for
offer and sale by the Company upon exercise of the Warrants under the securities
or blue sky laws of such state of the United States as any Holder reasonably
requests and do any and all other acts or things necessary or advisable to
enable such offer and sale in such jurisdictions; provided that the Company
shall not be required to (i) qualify to do business in any jurisdiction in which
it is not then so qualified or (ii) take any action which would subject it to
general service of process or to taxation in any jurisdiction in which it is not
then so subject.

        (i) The Company will bear all expenses incurred by it in connection with
the performance of its obligations under this Section 10.

        (j) The Company acknowledges and agrees that any remedy at law for
breach of any provision of this Section 10 will be inadequate and that, in
addition to any other remedies that the


                                      -19-
<PAGE>



Holders may have, the Holders will be entitled to the remedy of specific
performance to ensure the Company performs its obligations under this Section
10. The election of any one or more remedies by the Holders hereunder will not
constitute a waiver of the right to pursue other available remedies.

        11. Representations and Warranties of the Company. The Company hereby
represents and warrants to the Warrant Agent that:

               (a) The Company is a corporation duly organized, validly
        existing, and in good standing under the laws of the State of Delaware
        and has all requisite corporate power and authority to execute, deliver,
        and perform its obligations hereunder and to consummate the transactions
        contemplated hereby;

               (b) The execution, delivery, and performance of this Agreement by
        the Company and the consummation by the Company of the transactions
        contemplated hereby have been duly and validly authorized by all
        necessary corporate action on the part of the Company;

               (c) The execution, delivery, and performance of this Agreement by
        the Company and the consummation by the Company of the transactions
        contemplated hereby in accordance with the terms hereof do not and will
        not conflict with, violate, or constitute a breach of any material
        contract, agreement, or instrument by which the Company is bound or any
        judgment, order, decree, law, statute, rule, regulation, or other
        judicial or governmental restriction to which the Company is subject;

               (d) This Agreement constitutes the legal, valid, and binding
        obligation of the Company, enforceable against the Company in accordance
        with its terms, except as the enforceability hereof may be limited by
        bankruptcy, insolvency, reorganization, moratorium, or other similar
        laws affecting creditors' rights generally; and

               (e) The Warrants, when issued and delivered to the initial
        Holders as provided in this Agreement, and the Warrant Shares issued
        upon exercise of the Warrants, when issued, paid for, and delivered as
        provided in this Agreement, will be duly and validly issued and
        outstanding, fully paid, and nonassessable.

        12. Notices. All notices, requests, waivers, releases, consents, and
other communications required or permitted by this Agreement (collectively,
"Notices") must be in writing. Except as expressly otherwise provided herein
with respect to manner of delivery, notices will be deemed sufficiently given
for all purposes when delivered in person, when dispatched by telegram or
electronic facsimile transmission, when sent by first-class mail, postage
prepaid, or upon confirmation of receipt when dispatched by a nationally
recognized overnight courier service to the appropriate party as follows: (a) if
to a Holder, at the address of such Holder as shown in the registry books
maintained by the Warrant Agent; (b) if to the Company, at The Bank of New


                                      -20-
<PAGE>



York, 601 Barclay Street, 12W, New York, New York 10286, Telecopy No. (___)
___-____ (marked for the attention of the Chief Financial Officer and the
General Counsel), or at such other address as the Company may have furnished to
the Holders and the Warrant Agent in writing; and (c) if to the Warrant Agent,
at _________, ________, ________ _____, Telecopy No. (___) ___- ____ (marked for
the attention of _______________) or at such other address as the Warrant Agent
may have furnished to the Company and the Holders in writing.

        13. Amendment and Waiver. No failure or delay of the Holder in
exercising any power or right hereunder (other than a failure to exercise
Warrants in accordance with the provisions hereof) will operate as a waiver
thereof, nor will any single or partial exercise of any such right or power, or
any abandonment or discontinuance of steps to enforce such a right or power,
preclude any other or further exercise thereof or the exercise of any other
right or power. No notice or demand on the Company in any case will entitle the
Company to any other or future notice or demand in similar or other
circumstances. Subject to the last sentence of this Section 13, (a) if the
Company so directs, the Company and the Warrant Agent will supplement or amend
this Agreement without the approval of any Holders in order to cure any
ambiguity or correct or supplement any provision contained herein which may be
defective or inconsistent with any other provisions herein, or to make any other
provisions in regard to matters or questions arising hereunder which the Company
and the Warrant Agent may deem necessary or desirable and which shall not in any
way adversely affect the interests of the Holders of Warrants or the Warrant
Agent and (b) the Company and the Warrant Agent may from time to time supplement
or amend this Agreement, with the consent of Holders of at least 50% of the
Warrants then outstanding, for any other purpose. Notwithstanding anything in
this Agreement to the contrary, no supplement or amendment which increases the
Warrant Price, decreases the period of time remaining during which the Warrants
may be exercised, or changes in a manner adverse to Holders the number of
Warrant Shares purchasable upon the exercise of Warrants will be made without
the consent of all Holders. Any such amendment, modification, or waiver effected
pursuant to and in accordance with the provisions of this Section 13 will be
binding upon all Holders and upon each future Holder, the Company, and the
Warrant Agent. In the event of any such amendment, modification, or waiver, the
Company will give prompt notice thereof to all Holders and, if appropriate,
notation thereof will be made on all Warrant Certificates thereafter surrendered
for registration of transfer or exchange.

        14. Successors and Assigns. This Agreement will be binding upon and
inure to the benefit of the Company, the Warrant Agent, and their respective
successors and assigns, and, subject to Sections 1.4 and 8(b), all Holders.

        15. Rights of the Parties. Except as provided in Section 14, nothing
expressed or implied in this Agreement is intended or will be construed to
confer upon or give any person or entity other than the Company, the Warrant
Agent, and the Holders any rights or remedies under or by reason of this
Agreement or any transaction contemplated hereby. This Agreement will be for the
sole and exclusive benefit of the Company, the Warrant Agent, and the Holders.
All rights of action in respect of this Agreement are vested in the Holders, and
any Holder without the consent


                                      -21-
<PAGE>



of the Warrant Agent or any other Holder may, on such Holder's own behalf and
for such Holder's own benefit, enforce such Holder's rights hereunder, including
the right to exercise, exchange, or surrender for transfer such Holder's Warrant
Certificates in accordance with the provisions hereof.

        16. Titles and Headings. Titles and headings to Sections herein are
inserted for convenience of reference only and are not intended to be a part of
or to affect the meaning or interpretation of this Agreement.

        17. Certain Interpretive Matters and Definitions. Unless the context
otherwise requires, (a) all references to Sections or Exhibits are to Sections
or Exhibits of or to this Agreement, (b) each term defined in this Agreement has
the meaning assigned to it, (c) "or" is disjunctive but not necessarily
exclusive, and (d) words in the singular include the plural and vice versa. All
references to "$" or dollar amounts are to lawful currency of the United States
of America.

        18. Entire Agreement. This Agreement, together with its Exhibits,
constitutes the entire agreement among the parties hereto with respect to the
subject matter hereof, and there are no agreements among the parties hereto with
respect thereto except as expressly set forth herein.

        19. Severability. In case any provision contained in this Agreement is
invalid, illegal, or unenforceable, the validity, legality, and enforceability
of the remaining provisions will not in any way be affected or impaired thereby.
The Company and the Warrant Agent will endeavor in good faith to replace the
invalid, illegal, or unenforceable provisions with valid, legal, and enforceable
provisions the economic effect of which comes as close as possible to that of
the invalid, illegal, or unenforceable provisions.

        20. Governing Law. This Agreement will be governed by and construed in
accordance with the laws of the State of New York, without giving effect to the
principles of conflict of laws thereof.

        21. Counterparts. This Agreement may be executed in any number of
counterparts, each of which so executed will be deemed to be an original; such
counterparts will together constitute but one agreement.


                                      -22-
<PAGE>



        IN WITNESS WHEREOF, the parties to this Agreement have executed this
Agreement as of the date first above written.
                                               ARCH COMMUNICATIONS
                                               GROUP, INC.



                                               By:
                                                  ------------------------------
                                               Name:
                                                    ----------------------------
                                               Title:
                                                     ---------------------------


                                               THE BANK OF NEW YORK


                                               By:
                                                  ------------------------------
                                               Name:
                                                    ----------------------------
                                               Title:
                                                     ---------------------------



                                      -23-
<PAGE>



                                    EXHIBIT A

                           FORM OF WARRANT CERTIFICATE


THE WARRANTS REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO THE TERMS AND
CONDITIONS SET FORTH IN THE WARRANT AGREEMENT (AS HEREINAFTER DEFINED), A COPY
OF WHICH WILL BE MADE AVAILABLE BY THE ISSUER UPON REQUEST. THE TRANSFER OR
EXCHANGE OF THESE WARRANTS MUST BE REGISTERED IN ACCORDANCE WITH THE WARRANT
AGREEMENT.


NO.____                                                             WARRANTS____


                      VOID AT 5:00 P.M., NEW YORK CITY TIME
                              ON SEPTEMBER 1, 2001

               Arch Communications Group, Inc. Warrant Certificate


        THIS CERTIFIES THAT for value received, __________, or its registered
assigns (the "Holder"), is the owner of the number of Warrants set forth above
that initially entitle it to purchase from Arch Communications Group, Inc., a
Delaware corporation (the "Company"), at any time and from time to time prior to
5:00 p.m., New York City time, on September 1, 2001 (the "Expiration Date"), a
like number of fully paid and nonassessable shares of the Common Stock, par
value $.01 per share, of the Company (the "Common Stock") at an initial purchase
price of $____* per share (the "Warrant Price"), subject to adjustment as
provided in the Warrant Agreement. No Warrant may be exercised at or after 5:00
p.m., New York City time, on the Expiration Date, and to the extent not
exercised by such time, such Warrant shall become void. The shares of Common
Stock purchasable upon exercise of the Warrants are hereinafter referred to as
the "Warrant Shares." On the terms and subject to the conditions set forth in
the Warrant Agreement, the Warrants may be exercised by surrendering to the
Warrant Agent (as hereinafter defined) this Warrant Certificate, with the Form
of Exercise Notice on the reverse side hereof duly executed, together with cash,
a certified or bank cashier's check payable to the order of the Company, or a
wire transfer of immediately available funds to an account designated by the
Warrant Agent, in each case in an amount of lawful currency of the United States
of America equal to the product of (a) the number of Warrant Shares purchasable
upon the exercise of the Warrants designated for exercise in the Form of
Exercise Notice and (b) the Warrant Price.

- --------
*To be determined as provided in Schedule II to the Merger Agreement.


                                       A-1
<PAGE>



        The number and kind of Warrant Shares that may be purchased upon
exercise of the Warrants evidenced by this Warrant Certificate are the number as
of the date of the original issue of such Warrants, based on the shares of
Common Stock of the Company as constituted at such date. As provided in the
Warrant Agreement, the Warrant Price and the number and kind of Warrant Shares
purchasable upon exercise of the Warrants are subject to adjustment.

        This Warrant Certificate and the Warrants it represents are subject to,
and entitled to the benefits of, all of the terms, provisions, and conditions of
the Warrant Agreement, dated as of _____________, 199__ (the "Warrant
Agreement"), by and between the Company and The Bank of New York, a _________
corporation (the "Warrant Agent"), which Warrant Agreement is hereby
incorporated herein by reference and made a part hereof and to which Warrant
Agreement reference is hereby made for a full description of the rights,
limitation of rights, obligations, and duties hereunder of the Company and the
Holder. A copy of the Warrant Agreement will be made available to the Holders by
the Company upon request of the Holders.

        Subject to the provisions set forth in the Warrant Agreement or in this
Certificate, this Warrant Certificate, with or without other Warrant
Certificates, may be transferred, split up, combined, or exchanged for another
Warrant Certificate or Warrant Certificates, entitling the Holder to purchase a
like aggregate number of Warrant Shares as the Warrant Certificate or Warrant
Certificates surrendered entitled such Holder (or former Holder in the case of a
transfer) to purchase, upon presentation and surrender hereof at the principal
office of the Warrant Agent designated for such purpose, with the Form of
Assignment (if appropriate) and the related Certificate duly executed.

        The Company will not be required to issue fractional Warrant Shares or
other fractional interests in securities upon the exercise of any Warrants
evidenced by this Warrant Certificate, but in lieu thereof a cash payment will
be made, as provided in the Warrant Agreement.

        Nothing contained in the Warrant Agreement or in this Warrant
Certificate will be construed as conferring upon the Holder of this Warrant
Certificate the right to vote, or to receive dividends, or to consent or (except
as provided in the Warrant Agreement) to receive notice in respect of any
meeting of stockholders for the election of directors of the Company or any
other matter, or any rights whatsoever as a stockholder of the Company.

        This Warrant Certificate will not be valid or obligatory for any purpose
until it has been countersigned by the Warrant Agent. This Warrant Certificate
will be governed and construed in accordance with the laws of the State of New
York.




                                       A-2
<PAGE>



        IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to
be executed on this ____ day of __________, ____, by its corporate officers duly
authorized.


Attest:                                        ARCH COMMUNICATIONS GROUP, INC.



__________________________________             By:______________________________
[Name, title]                                     [Name, title]


Dated:  ______________


Countersigned:

THE BANK OF NEW YORK



By:_______________________________
    [Authorized Signature]
     [Title]


                                       A-3
<PAGE>



                   Form of Reverse Side of Warrant Certificate

                               FORM OF ASSIGNMENT

           (To be executed if the Holder desires to transfer Warrants)

               FOR VALUE RECEIVED,______________________________________________
hereby sells, assigns, and transfers unto_______________________________________
________________________________________________________________________________
                  (Please print name and address of transferee)

this Warrant Certificate, together with all right, title, and interest therein,
and does hereby irrevocably constitute and appoint Attorney, to transfer the
within Warrant Certificate on the books of the within-named Company, with full
power of substitution.

Dated:________________



                                                   _____________________________
                                                   Signature

Signature Guaranteed:


                                       A-4
<PAGE>



                             FORM OF EXERCISE NOTICE


           (To be executed if the Holder desires to exercise Warrants)


TO ARCH COMMUNICATIONS GROUP, INC.:

               The undersigned hereby irrevocably elects to exercise ___________
Warrants evidenced by this Warrant Certificate to purchase the Warrant Shares
issuable upon the exercise of such Warrants and requests that certificates for
such Warrant Shares be issued in the name of:
________________________________________________________________________________
                         (Please print name and address)
________________________________________________________________________________

Please insert social security or 
other identifying number:_______________________________________________________

If such number of Warrants is not all the Warrants evidenced by this Warrant
Certificate, a new Warrant Certificate for the balance remaining of such
Warrants will be registered in the name of and delivered to:

________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________

Please insert social security or 
other identifying number:_______________________________________________________

Dated:_________________

                                                   _____________________________
                                                   Signature
Signature Guaranteed:


                                       A-5
<PAGE>


                                     NOTICE

               Signatures on the foregoing Form of Assignment and Form of
Exercise Notice and in the related Warrant Certificates must correspond to the
name as written upon the face of this Warrant Certificate in every particular,
without alternation or enlargement or any change whatsoever.

               Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.



                                       A-6

<PAGE>

                      NORTHWESTERN MUTUAL SERIES FUND, INC.
                        for the High Yield Bond Portfolio
                            720 East Wisconsin Avenue
                           Milwaukee, Wisconsin 53202

                                September 3, 1998

Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts 01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey 07024

                                 Re:  Amendment to Commitment

Gentlemen:

        Reference is made to the letter agreement, dated August 18, 1998 (the
"Standby Commitment Letter"), among Arch Communications Group, Inc., MobileMedia
Communications, Inc. and Northwestern Mutual Series Fund, Inc. for the High
Yield Bond Portfolio. Terms used herein with initial capital letters that are
not otherwise defined shall have the meanings ascribed to such terms in the
Standby Commitment Letter.

        The parties hereto hereby agree as follows:

        1. First Paragraph.  The second sentence of the first paragraph of 
the Standby Commitment Letter is hereby amended in its entirety to read as 
follows:

        It is our understanding that in connection with the Reorganization,
        among other things: (a) pursuant to the Agreement and Plan of Merger,
        dated as of the date hereof (as amended by the First Amendment thereto
        dated as of September 3, 1998 (the "Merger Agreement"), among Arch, a
        wholly owned subsidiary of Arch ("Merger Sub"), Parent and MobileMedia,
        MobileMedia will merge with and into Merger Sub, with Merger Sub
        continuing as the surviving corporation and a wholly owned subsidiary of
        Arch; (b) pursuant to the Merger Agreement, Arch will make available for
        distribution pursuant to a plan of reorganization of the Debtors in the
        form attached as Exhibit A to the Merger Agreement, with such amendments
        and modifications thereto as are made in a manner consistent with clause
        (e) of Section 5 hereto (such plan of reorganization being referred to
        herein as the "Plan"), (i) cash, (ii) shares of its Common Stock, par
        value $.01 per share ("Existing Arch Common Stock"), and (iii) either
        (A) if a Rights Offering Adjustment (as defined in Schedule II to the
        Merger Agreement) shall not have occurred, warrants entitling the
        holders thereof to purchase shares of Existing Arch Common Stock ("Arch

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2

        Warrants"), with such Arch Warrants to be issued pursuant to, and to
        have the terms set forth in, a warrant agreement in the form attached as
        Exhibit B to the Merger Agreement (the "Arch Warrant Agreement") or (B)
        if a Rights Offering Adjustment shall have occurred, warrants entitling
        the holders thereof to purchase shares of Existing Arch Common Stock
        ("Arch Participation Warrants"), with such Arch Participation Warrants
        to be issued pursuant to, and to have the terms set forth in, a warrant
        agreement in the form attached as Exhibit B-1 to the Merger Agreement
        (the "Arch Participation Warrant Agreement"); (c) holders of unsecured
        non-priority claims against the Debtors ("Unsecured Claims"), to the
        extent such Unsecured Claims are Allowed (as defined in the Plan), will
        receive pursuant to the Plan (i) shares of Existing Arch Common Stock
        and (ii) rights to purchase ("Rights") for cash either (A) if a Rights
        Offering Adjustment shall not have occurred, units ("Units") consisting
        of (x) shares of Existing Arch Common Stock and (y) Arch Warrants or (B)
        if a Rights Offering Adjustment shall have occurred, shares of Existing
        Arch Common Stock ("Rights Shares"); (d) holders of claims arising under
        or relating to the Credit Agreement, dated December 4, 1995, as amended,
        among MobileMedia and the other parties thereto ("Secured Claims"), to
        the extent such Secured Claims are Allowed, will receive pursuant to the
        Plan cash in an amount equal to 100% of such claims; (e) all of the
        outstanding equity interests in MobileMedia and Parent will be canceled
        without consideration and Parent will be dissolved; and (f) the
        commitments under the DIP Loan Agreement will terminate and all amounts
        owed under or in respect of the DIP Loan Agreement will be paid in full
        in cash. Arch will conduct the Stockholder Rights Offering, in which it
        will issue to holders of Buyer Stock Stockholder Rights to acquire
        shares of Existing Arch Common Stock if a Rights Offering Adjustment
        shall have occurred, and, in addition, if a Rights Offering Adjustment
        shall have occurred, immediately following the Combination, Arch will
        issue Arch Participation Warrants to the stockholders of Arch to the
        extent any Stockholder Rights issued to such Stockholder Rights Holder
        were not exercised.

        2. Section 1(a). Section 1(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) to exercise any Rights distributed to it in respect of its
        Allowed Unsecured Claims in accordance with the Plan and not thereafter
        sold or transferred as permitted by Section 3 below to purchase either
        (i) if a Rights Offering Adjustment shall not have occurred, Units or
        (ii) if a Rights Offering Adjustment shall have occurred, Rights Shares,
        to the extent that the aggregate purchase price payable upon such
        exercise, as determined in accordance with Schedule II to the Merger
        Agreement (the "Subscription Price"), does not exceed the Rights
        Exercise Commitment Amount of the Standby Purchaser as set forth in
        Annex I hereto;

        3. Section 1(b).Section 1(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3

               (b) if (i) the Standby Purchaser sells or otherwise transfers any
        or all of the (A) the Rights distributed to it in accordance with the
        Plan or (B) Unsecured Claims held by it as of the date hereof in respect
        of which Rights are to be distributed, in each case as permitted by
        Section 3 below, and (ii) the Rights sold or transferred by the Standby
        Purchaser or the Rights distributed in respect of Unsecured Claims held
        by it as of the date hereof that are hereafter sold or transferred by
        the Standby Purchaser are not exercised prior to the expiration thereof
        (at which time such Rights will be void and will no longer be
        exercisable), to purchase for cash (based upon the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, identical Units or (y) if a Rights
        Offering Adjustment shall have occurred, Rights Shares underlying, in
        each case, such unexercised Rights, to the extent that the aggregate
        purchase price therefor, together with the aggregate Subscription Price
        payable upon exercise of Rights exercised as contemplated by clause (a)
        above, does not exceed the Rights Exercise Commitment Amount of the
        Standby Purchaser as set forth in Annex I hereto; and

        4. Section 1(c). Section 1(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) if any Rights distributed in accordance with the Plan (other
        than (i) Rights distributed to the Standby Purchaser or the other
        holders of Unsecured Claims listed on Annex I hereto (the "Other Standby
        Purchasers") and retained by them (which Rights are referred to in
        Section 1(a) above and Section 1(a) of each of the Other Standby
        Purchase Commitments (as defined in Section 13(a) below)) or (ii)
        subject to Section 3(b) below, Rights distributed in respect of
        Unsecured Claims held by the Standby Purchaser or the Other Standby
        Purchasers as of the date hereof that are hereafter sold or transferred
        by them (which Rights are referred to in Sections 1(b) and 3 hereof and
        Sections 1(b) and 3 of each of the Other Standby Purchase Commitments))
        remain unexercised upon the expiration thereof (at which time such
        Rights will be void and will no longer be exercisable), to purchase for
        cash (based on the Subscription Price payable upon exercise of such
        Rights) pro rata in accordance with and up to the Unexercised Rights
        Commitment Amount of the Standby Purchaser as set forth in Annex I
        hereto either (x) if a Rights Offering Adjustment shall not have
        occurred, identical Units or (y) if a Rights Offering Adjustment shall
        have occurred, Rights Shares, underlying, in each case, such unexercised
        Rights.

        5. Section 2(a). Section 2(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) Notwithstanding anything to the contrary herein contained, if
        the purchases by the Standby Purchaser contemplated by Section 1 above
        would cause the Standby Purchaser, the Other Standby Purchasers, and any
        other persons or entities who, when taken together with any one or more
        of the Standby Purchaser and the Other Standby 

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4

        Purchasers, would constitute a "person" or "group" as used in Section
        13(d) or Section 14(d) of the Exchange Act or Rule 13d-3 or Rule 13d-5
        promulgated thereunder, or any "affiliate" as defined in Rule 405
        promulgated under the Securities Act of any of them (collectively, the
        "Standby Class B Holders"), in the aggregate, to beneficially own on the
        effective date of the Plan (the "Effective Date") shares representing
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors or more than 49.0% of the total voting
        power of the capital stock of Arch, Arch will substitute shares of Class
        B Common Stock, par value $.01 per share, of Arch ("Arch Class B Common
        Stock"), with such Arch Class B Common Stock having the terms set forth
        in the form of Certificate of Amendment to Certificate of Incorporation
        of Arch attached as Exhibit F to the Merger Agreement (the "Arch Charter
        Amendment"), for shares of Existing Arch Common Stock so purchased on a
        one-for-one basis such that on the Effective Date the Standby Class B
        Holders, in the aggregate, will beneficially own shares representing not
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors and not more than 49.0% of the total voting
        power of the capital stock of Arch, all as provided in the Plan. For
        purposes of this letter agreement, "beneficial ownership" shall be
        determined as provided in Rule 13d-3 and Rule 13d-5 promulgated under
        the Exchange Act, except that a person or entity shall be deemed to have
        "beneficial ownership" of all securities that such person or entity has
        the right to acquire, whether such right is exercisable immediately or
        only after the passage of time.

        6. Section 3(b). Section 3(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (b) Notwithstanding the provisions of clause (Y) of the proviso
        in Section 3(a) above, the Standby Purchaser may elect to sell or
        otherwise transfer (i) any or all of the Rights distributed to it in
        accordance with the Plan or (ii) Unsecured Claims in respect of which
        Rights are to be so distributed, in either case without entering into a
        Tracking Agreement with its transferee or transferees (any Rights so
        transferred and any Rights distributed in respect of Allowed Claims so
        transferred, together with any Rights so transferred and any Rights
        distributed in respect of Allowed Claims so transferred by the Other
        Standby Purchasers pursuant to Section 3(b) of the Other Standby
        Purchase Commitments, being referred to herein collectively as
        "Untracked Rights"). Any Rights that remain unexercised upon expiration
        thereof will be deemed to be "Section 3(b) Rights" up to, but not
        exceeding, the amount of Untracked Rights. The Section 3(b) Rights shall
        be exercised as follows prior to the application of Section 1(c) above
        and Section 1(c) of the Other Standby Purchase Commitments: (A) the
        Standby Purchaser and the Other Standby Purchasers will first be given
        the opportunity to purchase for cash (based on the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, Units or (y) if a Rights Offering
        Adjustment shall have occurred, Rights Shares, underlying, in each case,
        a number of unexercised Rights up to the amount of Section 3(b) Rights
        in accordance with the percentages set forth in Column D of Annex I
        hereto and (B) to the extent such Units or

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5

        Rights Shares, as the case may be, are not so purchased, the Standby
        Purchaser and any Other Standby Purchasers that are responsible for the
        existence of the Section 3(b) Rights will be required to purchase such
        Units or Rights Shares, as the case may be, pro rata based on the number
        of Section 3(b) Rights resulting from their respective transfers.
        Nothing in this Section 3(b) will in any way reduce the commitment of
        the Standby Purchaser specified in Section 1(c) above or the Unexercised
        Rights Commitment Amount as set forth in Annex I hereto.

        7. Section 4. Section 4 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               4. The Closing. (a) Notwithstanding anything to the contrary
        herein contained or the terms of the Rights or the Plan, subject to the
        conditions set forth herein, on the Effective Date the Standby
        Purchaser, in satisfaction of the Commitment, will deliver at the
        Closing (i) the aggregate Subscription Price payable upon exercise of
        any Rights exercised by it and (ii) the purchase price payable in
        consideration of any shares of Existing Arch Common Stock or, if
        applicable, Arch Class B Common Stock and, if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants to be otherwise
        purchased by it pursuant to the Commitment; provided, however, that, if
        requested by the Standby Purchaser in writing at least two business days
        prior to the Effective Date, any cash to be distributed to the Standby
        Purchaser in respect of Allowed Secured Claims pursuant to the Plan
        will, prior to the distribution thereof pursuant to the Plan and in
        accordance with the instructions included in such written request, be
        first applied, on behalf of the Standby Purchaser, to the payment of
        such amounts payable on the Effective Date as provided in this Section
        4(a).

               (b) Upon payment of the amounts payable as provided in Section
        4(a), on the Effective Date at the Closing Arch will deliver to the
        Standby Purchaser (or its designees) certificates representing the
        shares of Existing Arch Common Stock, shares of Arch Class B Common
        Stock, if applicable, and, if a Rights Offering Adjustment shall not
        have occurred, the Arch Warrants, in each case, (i) issuable upon
        exercise of any Rights exercised by the Standby Purchaser or (ii)
        otherwise purchased by the Standby Purchaser pursuant to the Commitment.
        At the Closing, Arch will also deliver to the Standby Purchaser (or its
        designees) certificates representing the Arch Warrants or Arch
        Participation Warrants, as the case may be, contemplated by Section 7
        below.

               (c) (i) Arch will deliver to the Standby Purchaser two business
        days after the expiration of the Stockholder Rights Offering a written
        notice which shall (A) specify the amounts payable at the Closing by it
        in satisfaction of the Commitment (without taking into account Section
        4(e) below), (B) specify the Maximum Reduction Number (as defined in
        Section 4(e) below, (C) specify the last date on which the notice
        referred to in Section 4(c) (ii) below may be delivered, and (D)
        indicate the matters required to be addressed in such notice.

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6

                      (ii) Within 10 business days after its receipt of the
        notice referred to in Section 4(c)(i) above, the Standby Purchaser will
        deliver to Arch and MobileMedia a written notice which shall set forth
        the Elected Reduction Number (as defined in Section 4(e) below)
        determined by the Standby Purchaser in accordance with Section 4(e)
        below.

               (d) (i) Arch will deliver to the Standby Purchaser at least five
        business days prior to the Effective Date a written notice which shall
        specify the date on which the Effective Date is to occur and the last
        date on which the notice referred to in Section 4(d)(ii) below may be
        delivered.

                      (ii) At least two business days prior to the Effective
        Date, the Standby Purchaser will deliver to Arch and MobileMedia a
        written notice which shall set forth the number of shares of Existing
        Arch Common Stock beneficially owned by it as of such date. During the
        period from the date of such notice through the Effective Date, neither
        the Standby Purchaser nor any affiliate thereof shall acquire beneficial
        ownership of, or any rights to acquire, any additional shares of
        Existing Arch Common Stock or any Unsecured Claim.

               (e) If a Rights Offering Adjustment shall have occurred,
        notwithstanding anything to the contrary herein contained, the Standby
        Purchaser may elect to reduce the number of Rights Shares required to be
        purchased by the Standby Purchaser in satisfaction of its Commitment by
        a number (the "Elected Reduction Number") of Rights Shares equal to or
        less than the product of (i) the number of shares of Existing Arch
        Common Stock to be issued by Arch in the Stockholder Rights Offering and
        (ii) the percentage in Column D of Annex I hereto specified opposite the
        Standby Purchaser's name (such product being referred to herein as the
        "Maximum Reduction Number"). Subject to the immediately preceding
        sentence, the Standby Purchaser shall determine the Elected Reduction
        Number in its sole discretion.

        8. Section 5(c). Section 5(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) there shall be effective under the Securities Act, a
        registration statement (the "Shelf Registration Statement") covering the
        resale by the Standby Purchaser of (i) all shares of Existing Arch
        Common Stock, all shares of Arch Class B Common Stock, if applicable,
        and, if a Rights Offering Adjustment shall not have occurred, all Arch
        Warrants received by the Standby Purchaser as a result of the
        transactions contemplated by the Plan (including those received upon the
        exercise of Rights and pursuant to this letter agreement), (ii) if a
        Rights Offering Adjustment shall have occurred, all Arch Participation
        Warrants received by the Standby Purchaser pursuant to this letter
        agreement, and (iii) all shares of Existing Arch Common Stock issuable
        upon conversion of any such shares of the Arch Class B Common Stock or
        exercise of any such Arch Warrants or Arch

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7

        Participation Warrants, as the case may be (the securities referred to
        in the foregoing clauses (i), (ii) and (iii) are referred to herein as
        the "Registrable Securities");

        9. Section 5(e). Section 5(e) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (e) any and all amendments or modifications to the Merger
        Agreement or any exhibit or schedule thereto (including without
        limitation the Plan, the Arch Charter Amendment, the Arch Warrant
        Agreement, the Arch Participation Warrant Agreement and the Registration
        Rights Agreement) on or after the date hereof and any consents or
        waivers delivered on or after the date hereof by Arch or MobileMedia to
        the other under the Merger Agreement (other than (i) subject to Section
        15(a) below, consents under Section 4.5 of the Merger Agreement, (ii)
        waivers of Unilateral Conditions or (iii) any amendment to the Merger
        Agreement solely to reduce the amount of the Buyer Breakup Fee) shall
        have been in form and substance reasonably satisfactory to the Standby
        Purchaser;

        10. Section 5(j). Section 5(j) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (j) (i) the shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement shall be so issued and distributed pursuant to an
        exemption from registration under the Securities Act provided by Section
        1145 of the Bankruptcy Code, and (ii)(A) the issuance of the Rights, (B)
        the issuance of the shares of Existing Arch Common Stock, the shares of
        Arch Class B Common Stock, if applicable, and, if a Rights Offering
        Adjustment shall not have occurred, the Arch Warrants upon exercise of
        the Rights, (C) the issuance to the Standby Purchaser of the shares of
        Existing Arch Common Stock, the shares of Arch Class B Common Stock, if
        applicable, and, if a Rights Offering Adjustment shall not have
        occurred, the Arch Warrants as contemplated by Section 1 and Section 3
        above and the Arch Warrants or Arch Participation Warrants, as the case
        may be, as contemplated by Section 7 below, and (D) the issuance of
        Existing Arch Common Stock upon exercise of the Arch Warrants or Arch
        Participation Warrants, as the case may be, or conversion of Arch Class
        B Common Stock, if applicable, shall be covered by the Registration
        Statement, the Registration Statement shall have been declared effective
        and no stop order with respect thereto shall be in effect;

        11. Section 5(m) of the Standby Commitment Letter is hereby deleted.

        12. Section 7. Section 7 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8

               Consideration for the Commitment. In consideration for the
        Commitment, on the Effective Date at the Closing the Standby Purchaser
        will receive its pro rata share of either (a) if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants entitling the holders
        thereof to purchase, in the aggregate, a number of shares of Existing
        Arch Common Stock equal to 2.50% of the issued and outstanding shares of
        Existing Arch Common Stock and, if applicable, Arch Class B Common
        Stock, computed on a Fully Diluted Basis (as defined in the Plan) on the
        date the "Initial Buyer Market Price" is determined in accordance with
        Schedule II to the Merger Agreement giving effect to the Plan as if the
        Effective Date had occurred on such date and assuming 21,067,110 shares
        of Existing Arch Common Stock are issued and outstanding immediately
        prior thereto or (b) if a Rights Offering Adjustment shall have
        occurred, Arch Participation Warrants entitling the holders thereof to
        purchase, in the aggregate, a number of shares of Existing Arch Common
        Stock equal to 2.50% of the issued and outstanding shares of Existing
        Arch Common Stock and, if applicable, Arch Class B Common Stock,
        computed on a Fully Diluted Basis on the Rights Offering Adjustment
        Determination Date giving effect to the Plan as if the Effective Date
        had occurred on such date and assuming 21,067,110 shares of Existing
        Arch Common Stock are issued and outstanding immediately prior thereto.
        Such Arch Warrants or Arch Participation Warrants, as the case may be,
        will be delivered to the Standby Purchaser and the Other Standby
        Purchasers, in accordance with the percentages specified in Column D of
        Annex I hereto.

        13. Section 9(a)(x). Section 9(a)(x) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (a)(x) The shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement and the shares of Existing Arch Common Stock, the
        shares of Arch Class B Common Stock, if applicable, and either the Arch
        Warrants to be issued and delivered as contemplated by Section 1 and
        Section 3 above and the Arch Warrants to be issued as contemplated by
        Section 7 above or, if a Rights Offering Adjustment shall have occurred,
        the Arch Participation Warrants to be issued as contemplated by Section
        7 above, in each case, when so issued and distributed or delivered, as
        the case may be, and the shares of Existing Arch Common Stock issued
        upon conversation of such shares of Arch Class B Common Stock, if
        applicable, when so converted in accordance with the Arch Charter
        Amendment, and either, if a Rights Offering Adjustment shall not have
        occurred, the shares of Existing Arch Common Stock issued upon exercise
        of such Arch Warrants, when issued, paid for and delivered as provided
        in the Arch Warrant Agreement or, if a Rights Offering Adjustment shall
        have occurred, the shares of Existing Arch Common Stock issued upon
        exercise of Arch Participation Warrants, when issued, paid for and
        delivered as provided in the Arch Participation Warrant Agreement, will
        be duly authorized, validly issued, fully paid, nonassessable and free
        of all preemptive rights; and


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9

        14. Section 11. Section 11 of the Standby Commitment Letter is hereby
amended to change the reference therein to "Exhibit D" to a reference to
"Exhibit D-1."

        15. Schedule A to Annex I. Schedule A to Annex I to the Standby
Commitment Letter is hereby amended to read in its entirety as Schedule A
hereto.

        16. Continuation of Standby Commitment Letter. Except as specifically
amended hereby, the Standby Commitment Letter shall continue in full force and
effect and is hereby certified and confirmed in all respects.

        17. Consent to Amendments. The Standby Purchaser hereby (a) consents to
the amendments to the Other Standby Purchase Commitments to be effected by the
letter agreements attached as Exhibit C-1 hereto, which amendments shall be
entered into simultaneously herewith, (b) consents to (i) the First Amendment
dated as of September 3, 1998 to the Merger Agreement and each of the exhibits
attached thereto and (ii) the Second Amended Joint Plan of Reorganization dated
as of September 4, 1998 and each of the exhibits attached thereto, and (c)
agrees that the form and substance thereof are reasonably satisfactory to the
Standby Purchaser.

        18. Governing Law. This letter agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without regard to
its principles of conflicts of law.

        19. Counterparts. This letter agreement may be executed in counterparts
which, taken together, shall constitute one and the same instrument.



<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10

        If the foregoing accurately reflects your understanding with respect to
the matters set forth herein, please confirm by executing and returning a copy
of this letter to the undersigned.

                                    Very truly yours, 

                                    Northwestern Mutual Series Fund, Inc.
                                      for the High Yield Bond Portfolio


                                    By:
                                       -----------------------------------------
                                    Name: Timothy S. Collins
                                    Its:    Vice President

                                    Address:   c/o The Northwestern Mutual Life
                                                 Insurance Company
                                               720 E. Wisconsin Avenue
                                               Milwaukee, WI 53202
                                               Attention: Securities Department

ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.

By:
   --------------------------------
Name:
     ------------------------------
Its:
    -------------------------------

Address:       1800 West Park Drive, Suite 250
               Westborough, MA 01581
               Attn:  Chairman and Chief
                      Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA 02109
               Attn: Jay E. Bothwick



<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11

Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.

By:
   --------------------------------
Name:
     ------------------------------
Its:
    -------------------------------

Address:          Fort Lee Executive Park
                  One Executive Drive, Suite 500
                  Fort Lee, NJ 07024
                  Attn:  Chairman - Restructuring

With a copy to:   Sidley & Austin
                  875 Third Avenue, Suite 1400
                  New York, NY 10022
                  Attn:  James D. Johnson

<PAGE>

                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
                     for its Group Annuity Separate Account
                            720 East Wisconsin Avenue
                           Milwaukee, Wisconsin 53202

                                September 3, 1998

Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts 01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey 07024

                                  Re: Amendment to Commitment

Gentlemen:

        Reference is made to the letter agreement, dated August 18, 1998 (the
"Standby Commitment Letter"), among Arch Communications Group, Inc., MobileMedia
Communications, Inc. and The Northwestern Mutual Life Insurance Company for its
Group Annuity Separate Account. Terms used herein with initial capital letters
that are not otherwise defined shall have the meanings ascribed to such terms in
the Standby Commitment Letter.

        The parties hereto hereby agree as follows:

        1. First Paragraph. The second sentence of the first paragraph of the
Standby Commitment Letter is hereby amended in its entirety to read as follows:

        It is our understanding that in connection with the Reorganization,
        among other things: (a) pursuant to the Agreement and Plan of Merger,
        dated as of the date hereof (as amended by the First Amendment thereto
        dated as of September 3, 1998 (the "Merger Agreement"), among Arch, a
        wholly owned subsidiary of Arch ("Merger Sub"), Parent and MobileMedia,
        MobileMedia will merge with and into Merger Sub, with Merger Sub
        continuing as the surviving corporation and a wholly owned subsidiary of
        Arch; (b) pursuant to the Merger Agreement, Arch will make available for
        distribution pursuant to a plan of reorganization of the Debtors in the
        form attached as Exhibit A to the Merger Agreement, with such amendments
        and modifications thereto as are made in a manner consistent with clause
        (e) of Section 5 hereto (such plan of reorganization being referred to
        herein as the "Plan"), (i) cash, (ii) shares of its Common Stock, par
        value $.01 per share ("Existing Arch Common Stock"), and (iii) either
        (A) if a Rights Offering Adjustment (as defined in Schedule II to the
        Merger Agreement) shall not have occurred, warrants entitling the
        holders thereof to purchase shares of Existing Arch Common Stock ("Arch

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2

        Warrants"), with such Arch Warrants to be issued pursuant to, and to
        have the terms set forth in, a warrant agreement in the form attached as
        Exhibit B to the Merger Agreement (the "Arch Warrant Agreement") or (B)
        if a Rights Offering Adjustment shall have occurred, warrants entitling
        the holders thereof to purchase shares of Existing Arch Common Stock
        ("Arch Participation Warrants"), with such Arch Participation Warrants
        to be issued pursuant to, and to have the terms set forth in, a warrant
        agreement in the form attached as Exhibit B-1 to the Merger Agreement
        (the "Arch Participation Warrant Agreement"); (c) holders of unsecured
        non-priority claims against the Debtors ("Unsecured Claims"), to the
        extent such Unsecured Claims are Allowed (as defined in the Plan), will
        receive pursuant to the Plan (i) shares of Existing Arch Common Stock
        and (ii) rights to purchase ("Rights") for cash either (A) if a Rights
        Offering Adjustment shall not have occurred, units ("Units") consisting
        of (x) shares of Existing Arch Common Stock and (y) Arch Warrants or (B)
        if a Rights Offering Adjustment shall have occurred, shares of Existing
        Arch Common Stock ("Rights Shares"); (d) holders of claims arising under
        or relating to the Credit Agreement, dated December 4, 1995, as amended,
        among MobileMedia and the other parties thereto ("Secured Claims"), to
        the extent such Secured Claims are Allowed, will receive pursuant to the
        Plan cash in an amount equal to 100% of such claims; (e) all of the
        outstanding equity interests in MobileMedia and Parent will be canceled
        without consideration and Parent will be dissolved; and (f) the
        commitments under the DIP Loan Agreement will terminate and all amounts
        owed under or in respect of the DIP Loan Agreement will be paid in full
        in cash. Arch will conduct the Stockholder Rights Offering, in which it
        will issue to holders of Buyer Stock Stockholder Rights to acquire
        shares of Existing Arch Common Stock if a Rights Offering Adjustment
        shall have occurred, and, in addition, if a Rights Offering Adjustment
        shall have occurred, immediately following the Combination, Arch will
        issue Arch Participation Warrants to the stockholders of Arch to the
        extent any Stockholder Rights issued to such Stockholder Rights Holder
        were not exercised.

        2. Section 1(a). Section 1(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) to exercise any Rights distributed to it in respect of its
        Allowed Unsecured Claims in accordance with the Plan and not thereafter
        sold or transferred as permitted by Section 3 below to purchase either
        (i) if a Rights Offering Adjustment shall not have occurred, Units or
        (ii) if a Rights Offering Adjustment shall have occurred, Rights Shares,
        to the extent that the aggregate purchase price payable upon such
        exercise, as determined in accordance with Schedule II to the Merger
        Agreement (the "Subscription Price"), does not exceed the Rights
        Exercise Commitment Amount of the Standby Purchaser as set forth in
        Annex I hereto;

        3. Section 1(b).Section 1(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3

               (b) if (i) the Standby Purchaser sells or otherwise transfers any
        or all of the (A) the Rights distributed to it in accordance with the
        Plan or (B) Unsecured Claims held by it as of the date hereof in respect
        of which Rights are to be distributed, in each case as permitted by
        Section 3 below, and (ii) the Rights sold or transferred by the Standby
        Purchaser or the Rights distributed in respect of Unsecured Claims held
        by it as of the date hereof that are hereafter sold or transferred by
        the Standby Purchaser are not exercised prior to the expiration thereof
        (at which time such Rights will be void and will no longer be
        exercisable), to purchase for cash (based upon the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, identical Units or (y) if a Rights
        Offering Adjustment shall have occurred, Rights Shares underlying, in
        each case, such unexercised Rights, to the extent that the aggregate
        purchase price therefor, together with the aggregate Subscription Price
        payable upon exercise of Rights exercised as contemplated by clause (a)
        above, does not exceed the Rights Exercise Commitment Amount of the
        Standby Purchaser as set forth in Annex I hereto; and

        4. Section 1(c). Section 1(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) if any Rights distributed in accordance with the Plan (other
        than (i) Rights distributed to the Standby Purchaser or the other
        holders of Unsecured Claims listed on Annex I hereto (the "Other Standby
        Purchasers") and retained by them (which Rights are referred to in
        Section 1(a) above and Section 1(a) of each of the Other Standby
        Purchase Commitments (as defined in Section 13(a) below)) or (ii)
        subject to Section 3(b) below, Rights distributed in respect of
        Unsecured Claims held by the Standby Purchaser or the Other Standby
        Purchasers as of the date hereof that are hereafter sold or transferred
        by them (which Rights are referred to in Sections 1(b) and 3 hereof and
        Sections 1(b) and 3 of each of the Other Standby Purchase Commitments))
        remain unexercised upon the expiration thereof (at which time such
        Rights will be void and will no longer be exercisable), to purchase for
        cash (based on the Subscription Price payable upon exercise of such
        Rights ) pro rata in accordance with and up to the Unexercised Rights
        Commitment Amount of the Standby Purchaser as set forth in Annex I
        hereto either (x) if a Rights Offering Adjustment shall not have
        occurred, identical Units or (y) if a Rights Offering Adjustment shall
        have occurred, Rights Shares, underlying, in each case, such unexercised
        Rights.

        5. Section 2(a). Section 2(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) Notwithstanding anything to the contrary herein contained, if
        the purchases by the Standby Purchaser contemplated by Section 1 above
        would cause the Standby Purchaser, the Other Standby Purchasers, and any
        other persons or entities who, when taken together with any one or more
        of the Standby Purchaser and the Other Standby

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4

        Purchasers, would constitute a "person" or "group" as used in Section
        13(d) or Section 14(d) of the Exchange Act or Rule 13d-3 or Rule 13d-5
        promulgated thereunder, or any "affiliate" as defined in Rule 405
        promulgated under the Securities Act of any of them (collectively, the
        "Standby Class B Holders"), in the aggregate, to beneficially own on the
        effective date of the Plan (the "Effective Date") shares representing
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors or more than 49.0% of the total voting
        power of the capital stock of Arch, Arch will substitute shares of Class
        B Common Stock, par value $.01 per share, of Arch ("Arch Class B Common
        Stock"), with such Arch Class B Common Stock having the terms set forth
        in the form of Certificate of Amendment to Certificate of Incorporation
        of Arch attached as Exhibit F to the Merger Agreement (the "Arch Charter
        Amendment"), for shares of Existing Arch Common Stock so purchased on a
        one-for-one basis such that on the Effective Date the Standby Class B
        Holders, in the aggregate, will beneficially own shares representing not
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors and not more than 49.0% of the total voting
        power of the capital stock of Arch, all as provided in the Plan. For
        purposes of this letter agreement, "beneficial ownership" shall be
        determined as provided in Rule 13d-3 and Rule 13d-5 promulgated under
        the Exchange Act, except that a person or entity shall be deemed to have
        "beneficial ownership" of all securities that such person or entity has
        the right to acquire, whether such right is exercisable immediately or
        only after the passage of time.

        6. Section 3(b). Section 3(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (b) Notwithstanding the provisions of clause (Y) of the proviso
        in Section 3(a) above, the Standby Purchaser may elect to sell or
        otherwise transfer (i) any or all of the Rights distributed to it in
        accordance with the Plan or (ii) Unsecured Claims in respect of which
        Rights are to be so distributed, in either case without entering into a
        Tracking Agreement with its transferee or transferees (any Rights so
        transferred and any Rights distributed in respect of Allowed Claims so
        transferred, together with any Rights so transferred and any Rights
        distributed in respect of Allowed Claims so transferred by the Other
        Standby Purchasers pursuant to Section 3(b) of the Other Standby
        Purchase Commitments, being referred to herein collectively as
        "Untracked Rights"). Any Rights that remain unexercised upon expiration
        thereof will be deemed to be "Section 3(b) Rights" up to, but not
        exceeding, the amount of Untracked Rights. The Section 3(b) Rights shall
        be exercised as follows prior to the application of Section 1(c) above
        and Section 1(c) of the Other Standby Purchase Commitments: (A) the
        Standby Purchaser and the Other Standby Purchasers will first be given
        the opportunity to purchase for cash (based on the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, Units or (y) if a Rights Offering
        Adjustment shall have occurred, Rights Shares, underlying, in each case,
        a number of unexercised Rights up to the amount of Section 3(b) Rights
        in accordance with the percentages set forth in Column D of Annex I
        hereto and (B) to the extent such Units or

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5

        Rights Shares, as the case may be, are not so purchased, the Standby
        Purchaser and any Other Standby Purchasers that are responsible for the
        existence of the Section 3(b) Rights will be required to purchase such
        Units or Rights Shares, as the case may be, pro rata based on the number
        of Section 3(b) Rights resulting from their respective transfers.
        Nothing in this Section 3(b) will in any way reduce the commitment of
        the Standby Purchaser specified in Section 1(c) above or the Unexercised
        Rights Commitment Amount as set forth in Annex I hereto.

        7. Section 4. Section 4 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               4. The Closing. (a) Notwithstanding anything to the contrary
        herein contained or the terms of the Rights or the Plan, subject to the
        conditions set forth herein, on the Effective Date the Standby
        Purchaser, in satisfaction of the Commitment, will deliver at the
        Closing (i) the aggregate Subscription Price payable upon exercise of
        any Rights exercised by it and (ii) the purchase price payable in
        consideration of any shares of Existing Arch Common Stock or, if
        applicable, Arch Class B Common Stock and, if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants to be otherwise
        purchased by it pursuant to the Commitment; provided, however, that, if
        requested by the Standby Purchaser in writing at least two business days
        prior to the Effective Date, any cash to be distributed to the Standby
        Purchaser in respect of Allowed Secured Claims pursuant to the Plan
        will, prior to the distribution thereof pursuant to the Plan and in
        accordance with the instructions included in such written request, be
        first applied, on behalf of the Standby Purchaser, to the payment of
        such amounts payable on the Effective Date as provided in this Section
        4(a).

               (b) Upon payment of the amounts payable as provided in Section
        4(a), on the Effective Date at the Closing Arch will deliver to the
        Standby Purchaser (or its designees) certificates representing the
        shares of Existing Arch Common Stock, shares of Arch Class B Common
        Stock, if applicable, and, if a Rights Offering Adjustment shall not
        have occurred, the Arch Warrants, in each case, (i) issuable upon
        exercise of any Rights exercised by the Standby Purchaser or (ii)
        otherwise purchased by the Standby Purchaser pursuant to the Commitment.
        At the Closing, Arch will also deliver to the Standby Purchaser (or its
        designees) certificates representing the Arch Warrants or Arch
        Participation Warrants, as the case may be, contemplated by Section 7
        below.

               (c) (i) Arch will deliver to the Standby Purchaser two business
        days after the expiration of the Stockholder Rights Offering a written
        notice which shall (A) specify the amounts payable at the Closing by it
        in satisfaction of the Commitment (without taking into account Section
        4(e) below), (B) specify the Maximum Reduction Number (as defined in
        Section 4(e) below, (C) specify the last date on which the notice
        referred to in Section 4(c) (ii) below may be delivered, and (D)
        indicate the matters required to be addressed in such notice.

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6

                      (ii) Within 10 business days after its receipt of the
        notice referred to in Section 4(c)(i) above, the Standby Purchaser will
        deliver to Arch and MobileMedia a written notice which shall set forth
        the Elected Reduction Number (as defined in Section 4(e) below)
        determined by the Standby Purchaser in accordance with Section 4(e)
        below.

               (d) (i) Arch will deliver to the Standby Purchaser at least five
        business days prior to the Effective Date a written notice which shall
        specify the date on which the Effective Date is to occur and the last
        date on which the notice referred to in Section 4(d)(ii) below may be
        delivered.

                      (ii) At least two business days prior to the Effective
        Date, the Standby Purchaser will deliver to Arch and MobileMedia a
        written notice which shall set forth the number of shares of Existing
        Arch Common Stock beneficially owned by it as of such date. During the
        period from the date of such notice through the Effective Date, neither
        the Standby Purchaser nor any affiliate thereof shall acquire beneficial
        ownership of, or any rights to acquire, any additional shares of
        Existing Arch Common Stock or any Unsecured Claim.

               (e) If a Rights Offering Adjustment shall have occurred,
        notwithstanding anything to the contrary herein contained, the Standby
        Purchaser may elect to reduce the number of Rights Shares required to be
        purchased by the Standby Purchaser in satisfaction of its Commitment by
        a number (the "Elected Reduction Number") of Rights Shares equal to or
        less than the product of (i) the number of shares of Existing Arch
        Common Stock to be issued by Arch in the Stockholder Rights Offering and
        (ii) the percentage in Column D of Annex I hereto specified opposite the
        Standby Purchaser's name (such product being referred to herein as the
        "Maximum Reduction Number"). Subject to the immediately preceding
        sentence, the Standby Purchaser shall determine the Elected Reduction
        Number in its sole discretion.

        8. Section 5(c). Section 5(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) there shall be effective under the Securities Act, a
        registration statement (the "Shelf Registration Statement") covering the
        resale by the Standby Purchaser of (i) all shares of Existing Arch
        Common Stock, all shares of Arch Class B Common Stock, if applicable,
        and, if a Rights Offering Adjustment shall not have occurred, all Arch
        Warrants received by the Standby Purchaser as a result of the
        transactions contemplated by the Plan (including those received upon the
        exercise of Rights and pursuant to this letter agreement), (ii) if a
        Rights Offering Adjustment shall have occurred, all Arch Participation
        Warrants received by the Standby Purchaser pursuant to this letter
        agreement, and (iii) all shares of Existing Arch Common Stock issuable
        upon conversion of any such shares of the Arch Class B Common Stock or
        exercise of any such Arch Warrants or Arch

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7

        Participation Warrants, as the case may be (the securities referred to
        in the foregoing clauses (i), (ii) and (iii) are referred to herein as
        the "Registrable Securities");

        9. Section 5(e). Section 5(e) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (e) any and all amendments or modifications to the Merger
        Agreement or any exhibit or schedule thereto (including without
        limitation the Plan, the Arch Charter Amendment, the Arch Warrant
        Agreement, the Arch Participation Warrant Agreement and the Registration
        Rights Agreement) on or after the date hereof and any consents or
        waivers delivered on or after the date hereof by Arch or MobileMedia to
        the other under the Merger Agreement (other than (i) subject to Section
        15(a) below, consents under Section 4.5 of the Merger Agreement, (ii)
        waivers of Unilateral Conditions or (iii) any amendment to the Merger
        Agreement solely to reduce the amount of the Buyer Breakup Fee) shall
        have been in form and substance reasonably satisfactory to the Standby
        Purchaser;

        10. Section 5(j). Section 5(j) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (j) (i) the shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement shall be so issued and distributed pursuant to an
        exemption from registration under the Securities Act provided by Section
        1145 of the Bankruptcy Code, and (ii)(A) the issuance of the Rights, (B)
        the issuance of the shares of Existing Arch Common Stock, the shares of
        Arch Class B Common Stock, if applicable, and, if a Rights Offering
        Adjustment shall not have occurred, the Arch Warrants upon exercise of
        the Rights, (C) the issuance to the Standby Purchaser of the shares of
        Existing Arch Common Stock, the shares of Arch Class B Common Stock, if
        applicable, and, if a Rights Offering Adjustment shall not have
        occurred, the Arch Warrants as contemplated by Section 1 and Section 3
        above and the Arch Warrants or Arch Participation Warrants, as the case
        may be, as contemplated by Section 7 below, and (D) the issuance of
        Existing Arch Common Stock upon exercise of the Arch Warrants or Arch
        Participation Warrants, as the case may be, or conversion of Arch Class
        B Common Stock, if applicable, shall be covered by the Registration
        Statement, the Registration Statement shall have been declared effective
        and no stop order with respect thereto shall be in effect;

        11. Section 5(m) of the Standby Commitment Letter is hereby deleted.

        12. Section 7. Section 7 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8

               Consideration for the Commitment. In consideration for the
        Commitment, on the Effective Date at the Closing the Standby Purchaser
        will receive its pro rata share of either (a) if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants entitling the holders
        thereof to purchase, in the aggregate, a number of shares of Existing
        Arch Common Stock equal to 2.50% of the issued and outstanding shares of
        Existing Arch Common Stock and, if applicable, Arch Class B Common
        Stock, computed on a Fully Diluted Basis (as defined in the Plan) on the
        date the "Initial Buyer Market Price" is determined in accordance with
        Schedule II to the Merger Agreement giving effect to the Plan as if the
        Effective Date had occurred on such date and assuming 21,067,110 shares
        of Existing Arch Common Stock are issued and outstanding immediately
        prior thereto or (b) if a Rights Offering Adjustment shall have
        occurred, Arch Participation Warrants entitling the holders thereof to
        purchase, in the aggregate, a number of shares of Existing Arch Common
        Stock equal to 2.50% of the issued and outstanding shares of Existing
        Arch Common Stock and, if applicable, Arch Class B Common Stock,
        computed on a Fully Diluted Basis on the Rights Offering Adjustment
        Determination Date giving effect to the Plan as if the Effective Date
        had occurred on such date and assuming 21,067,110 shares of Existing
        Arch Common Stock are issued and outstanding immediately prior thereto.
        Such Arch Warrants or Arch Participation Warrants, as the case may be,
        will be delivered to the Standby Purchaser and the Other Standby
        Purchasers, in accordance with the percentages specified in Column D of
        Annex I hereto.

        13. Section 9(a)(x). Section 9(a)(x) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (a)(x) The shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement and the shares of Existing Arch Common Stock, the
        shares of Arch Class B Common Stock, if applicable, and either the Arch
        Warrants to be issued and delivered as contemplated by Section 1 and
        Section 3 above and the Arch Warrants to be issued as contemplated by
        Section 7 above or, if a Rights Offering Adjustment shall have occurred,
        the Arch Participation Warrants to be issued as contemplated by Section
        7 above, in each case, when so issued and distributed or delivered, as
        the case may be, and the shares of Existing Arch Common Stock issued
        upon conversation of such shares of Arch Class B Common Stock, if
        applicable, when so converted in accordance with the Arch Charter
        Amendment, and either, if a Rights Offering Adjustment shall not have
        occurred, the shares of Existing Arch Common Stock issued upon exercise
        of such Arch Warrants, when issued, paid for and delivered as provided
        in the Arch Warrant Agreement or, if a Rights Offering Adjustment shall
        have occurred, the shares of Existing Arch Common Stock issued upon
        exercise of Arch Participation Warrants, when issued, paid for and
        delivered as provided in the Arch Participation Warrant Agreement, will
        be duly authorized, validly issued, fully paid, nonassessable and free
        of all preemptive rights; and


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9

        14. Section 11. Section 11 of the Standby Commitment Letter is hereby
amended to change the reference therein to "Exhibit D" to a reference to
"Exhibit D-1."

        15. Schedule A to Annex I. Schedule A to Annex I to the Standby
Commitment Letter is hereby amended to read in its entirety as Schedule A
hereto.

        16. Continuation of Standby Commitment Letter. Except as specifically
amended hereby, the Standby Commitment Letter shall continue in full force and
effect and is hereby certified and confirmed in all respects.

        17. Consent to Amendments. The Standby Purchaser hereby (a) consents to
the amendments to the Other Standby Purchase Commitments to be effected by the
letter agreements attached as Exhibit C-1 hereto, which amendments shall be
entered into simultaneously herewith, (b) consents to (i) the First Amendment
dated as of September 3, 1998 to the Merger Agreement and each of the exhibits
attached thereto and (ii) the Second Amended Joint Plan of Reorganization dated
as of September 4, 1998 and each of the exhibits attached thereto, and (c)
agrees that the form and substance thereof are reasonably satisfactory to the
Standby Purchaser.

        18. Governing Law. This letter agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without regard to
its principles of conflicts of law.

        19. Counterparts. This letter agreement may be executed in counterparts
which, taken together, shall constitute one and the same instrument.



<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10

        If the foregoing accurately reflects your understanding with respect to
the matters set forth herein, please confirm by executing and returning a copy
of this letter to the undersigned.

                                   Very truly yours,

                                   The Northwestern Mutual Life
                                     Insurance Company
                                     for its Group Annuity Separate Account

                                   By: Northwestern Investment
                                         Management Company


                                           By:
                                              ----------------------------------
                                           Name: Steven P. Swanson
                                           Its:  Managing Director

                                           Address: 720 E. Wisconsin Avenue
                                                    Milwaukee, WI 53202
                                                    Attention: Securities
                                                          Department
                                   
ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.

By:
   --------------------------------

Name:
     ------------------------------

Its:
     ------------------------------

Address:   1800 West Park Drive, Suite 250
           Westborough, MA 01581
           Attn:  Chairman and Chief
                    Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA 02109
               Attn: Jay E. Bothwick

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11

Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.

By:
   --------------------------------

Name:
     ------------------------------

Its:
     ------------------------------

Address:          Fort Lee Executive Park
                  One Executive Drive, Suite 500
                  Fort Lee, NJ 07024
                  Attn:  Chairman - Restructuring

With a copy to:   Sidley & Austin
                  875 Third Avenue, Suite 1400
                  New York, NY 10022
                  Attn:  James D. Johnson
<PAGE>

                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
                            720 East Wisconsin Avenue
                           Milwaukee, Wisconsin 53202

                                September 3, 1998

Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts 01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey 07024

                                 Re:  Amendment to Commitment

Gentlemen:

        Reference is made to the letter agreement, dated August 18, 1998 (the
"Standby Commitment Letter"), among Arch Communications Group, Inc., MobileMedia
Communications, Inc. and The Northwestern Mutual Life Insurance Company. Terms
used herein with initial capital letters that are not otherwise defined shall
have the meanings ascribed to such terms in the Standby Commitment Letter. The
parties hereto hereby agree as follows:

        1. First Paragraph. The second sentence of the first paragraph of the
Standby Commitment Letter is hereby amended in its entirety to read as follows:

        It is our understanding that in connection with the Reorganization,
        among other things: (a) pursuant to the Agreement and Plan of Merger,
        dated as of the date hereof (as amended by the First Amendment thereto
        dated as of September 3, 1998 (the "Merger Agreement"), among Arch, a
        wholly owned subsidiary of Arch ("Merger Sub"), Parent and MobileMedia,
        MobileMedia will merge with and into Merger Sub, with Merger Sub
        continuing as the surviving corporation and a wholly owned subsidiary of
        Arch; (b) pursuant to the Merger Agreement, Arch will make available for
        distribution pursuant to a plan of reorganization of the Debtors in the
        form attached as Exhibit A to the Merger Agreement, with such amendments
        and modifications thereto as are made in a manner consistent with clause
        (e) of Section 5 hereto (such plan of reorganization being referred to
        herein as the "Plan"), (i) cash, (ii) shares of its Common Stock, par
        value $.01 per share ("Existing Arch Common Stock"), and (iii) either
        (A) if a Rights Offering Adjustment (as defined in Schedule II to the
        Merger Agreement) shall not have occurred, warrants entitling the
        holders thereof to purchase shares of Existing Arch Common Stock ("Arch
        Warrants"), with such Arch Warrants to be issued pursuant to, and to
        have the terms set forth in, a warrant agreement in the form attached as
        Exhibit B to the Merger Agreement

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2

        (the "Arch Warrant Agreement") or (B) if a Rights Offering Adjustment
        shall have occurred, warrants entitling the holders thereof to purchase
        shares of Existing Arch Common Stock ("Arch Participation Warrants"),
        with such Arch Participation Warrants to be issued pursuant to, and to
        have the terms set forth in, a warrant agreement in the form attached as
        Exhibit B-1 to the Merger Agreement (the "Arch Participation Warrant
        Agreement"); (c) holders of unsecured non-priority claims against the
        Debtors ("Unsecured Claims"), to the extent such Unsecured Claims are
        Allowed (as defined in the Plan), will receive pursuant to the Plan (i)
        shares of Existing Arch Common Stock and (ii) rights to purchase
        ("Rights") for cash either (A) if a Rights Offering Adjustment shall not
        have occurred, units ("Units") consisting of (x) shares of Existing Arch
        Common Stock and (y) Arch Warrants or (B) if a Rights Offering
        Adjustment shall have occurred, shares of Existing Arch Common Stock
        ("Rights Shares"); (d) holders of claims arising under or relating to
        the Credit Agreement, dated December 4, 1995, as amended, among
        MobileMedia and the other parties thereto ("Secured Claims"), to the
        extent such Secured Claims are Allowed, will receive pursuant to the
        Plan cash in an amount equal to 100% of such claims; (e) all of the
        outstanding equity interests in MobileMedia and Parent will be canceled
        without consideration and Parent will be dissolved; and (f) the
        commitments under the DIP Loan Agreement will terminate and all amounts
        owed under or in respect of the DIP Loan Agreement will be paid in full
        in cash. Arch will conduct the Stockholder Rights Offering, in which it
        will issue to holders of Buyer Stock Stockholder Rights to acquire
        shares of Existing Arch Common Stock if a Rights Offering Adjustment
        shall have occurred, and, in addition, if a Rights Offering Adjustment
        shall have occurred, immediately following the Combination, Arch will
        issue Arch Participation Warrants to the stockholders of Arch to the
        extent any Stockholder Rights issued to such Stockholder Rights Holder
        were not exercised.

        2. Section 1(a). Section 1(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) to exercise any Rights distributed to it in respect of its
        Allowed Unsecured Claims in accordance with the Plan and not thereafter
        sold or transferred as permitted by Section 3 below to purchase either
        (i) if a Rights Offering Adjustment shall not have occurred, Units or
        (ii) if a Rights Offering Adjustment shall have occurred, Rights Shares,
        to the extent that the aggregate purchase price payable upon such
        exercise, as determined in accordance with Schedule II to the Merger
        Agreement (the "Subscription Price"), does not exceed the Rights
        Exercise Commitment Amount of the Standby Purchaser as set forth in
        Annex I hereto;

        3. Section 1(b).Section 1(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (b) if (i) the Standby Purchaser sells or otherwise transfers any
        or all of the (A) the Rights distributed to it in accordance with the
        Plan or (B) Unsecured Claims held by it

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3

        as of the date hereof in respect of which Rights are to be
        distributed, in each case as permitted by Section 3 below, and (ii) the
        Rights sold or transferred by the Standby Purchaser or the Rights
        distributed in respect of Unsecured Claims held by it as of the date
        hereof that are hereafter sold or transferred by the Standby Purchaser
        are not exercised prior to the expiration thereof (at which time such
        Rights will be void and will no longer be exercisable), to purchase for
        cash (based upon the Subscription Price payable upon exercise of such
        Rights) either (x) if a Rights Offering Adjustment shall not have
        occurred, identical Units or (y) if a Rights Offering Adjustment shall
        have occurred, Rights Shares underlying, in each case, such unexercised
        Rights, to the extent that the aggregate purchase price therefor,
        together with the aggregate Subscription Price payable upon exercise of
        Rights exercised as contemplated by clause (a) above, does not exceed
        the Rights Exercise Commitment Amount of the Standby Purchaser as set
        forth in Annex I hereto; and

        4. Section 1(c). Section 1(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) if any Rights distributed in accordance with the Plan (other
        than (i) Rights distributed to the Standby Purchaser or the other
        holders of Unsecured Claims listed on Annex I hereto (the "Other Standby
        Purchasers") and retained by them (which Rights are referred to in
        Section 1(a) above and Section 1(a) of each of the Other Standby
        Purchase Commitments (as defined in Section 13(a) below)) or (ii)
        subject to Section 3(b) below, Rights distributed in respect of
        Unsecured Claims held by the Standby Purchaser or the Other Standby
        Purchasers as of the date hereof that are hereafter sold or transferred
        by them (which Rights are referred to in Sections 1(b) and 3 hereof and
        Sections 1(b) and 3 of each of the Other Standby Purchase Commitments))
        remain unexercised upon the expiration thereof (at which time such
        Rights will be void and will no longer be exercisable), to purchase for
        cash (based on the Subscription Price payable upon exercise of such
        Rights ) pro rata in accordance with and up to the Unexercised Rights
        Commitment Amount of the Standby Purchaser as set forth in Annex I
        hereto either (x) if a Rights Offering Adjustment shall not have
        occurred, identical Units or (y) if a Rights Offering Adjustment shall
        have occurred, Rights Shares, underlying, in each case, such unexercised
        Rights.

        5. Section 2(a). Section 2(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) Notwithstanding anything to the contrary herein contained, if
        the purchases by the Standby Purchaser contemplated by Section 1 above
        would cause the Standby Purchaser, the Other Standby Purchasers, and any
        other persons or entities who, when taken together with any one or more
        of the Standby Purchaser and the Other Standby Purchasers, would
        constitute a "person" or "group" as used in Section 13(d) or Section
        14(d) of the Exchange Act or Rule 13d-3 or Rule 13d-5 promulgated
        thereunder, or any

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4

        "affiliate" as defined in Rule 405 promulgated under the Securities Act
        of any of them (collectively, the "Standby Class B Holders"), in the
        aggregate, to beneficially own on the effective date of the Plan (the
        "Effective Date") shares representing more than 49.0% of the capital
        stock of Arch generally entitled to vote in the election of directors or
        more than 49.0% of the total voting power of the capital stock of Arch,
        Arch will substitute shares of Class B Common Stock, par value $.01 per
        share, of Arch ("Arch Class B Common Stock"), with such Arch Class B
        Common Stock having the terms set forth in the form of Certificate of
        Amendment to Certificate of Incorporation of Arch attached as Exhibit F
        to the Merger Agreement (the "Arch Charter Amendment"), for shares of
        Existing Arch Common Stock so purchased on a one-for-one basis such that
        on the Effective Date the Standby Class B Holders, in the aggregate,
        will beneficially own shares representing not more than 49.0% of the
        capital stock of Arch generally entitled to vote in the election of
        directors and not more than 49.0% of the total voting power of the
        capital stock of Arch, all as provided in the Plan. For purposes of this
        letter agreement, "beneficial ownership" shall be determined as provided
        in Rule 13d-3 and Rule 13d-5 promulgated under the Exchange Act, except
        that a person or entity shall be deemed to have "beneficial ownership"
        of all securities that such person or entity has the right to acquire,
        whether such right is exercisable immediately or only after the passage
        of time.

        6. Section 3(b). Section 3(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (b) Notwithstanding the provisions of clause (Y) of the proviso
        in Section 3(a) above, the Standby Purchaser may elect to sell or
        otherwise transfer (i) any or all of the Rights distributed to it in
        accordance with the Plan or (ii) Unsecured Claims in respect of which
        Rights are to be so distributed, in either case without entering into a
        Tracking Agreement with its transferee or transferees (any Rights so
        transferred and any Rights distributed in respect of Allowed Claims so
        transferred, together with any Rights so transferred and any Rights
        distributed in respect of Allowed Claims so transferred by the Other
        Standby Purchasers pursuant to Section 3(b) of the Other Standby
        Purchase Commitments, being referred to herein collectively as
        "Untracked Rights"). Any Rights that remain unexercised upon expiration
        thereof will be deemed to be "Section 3(b) Rights" up to, but not
        exceeding, the amount of Untracked Rights. The Section 3(b) Rights shall
        be exercised as follows prior to the application of Section 1(c) above
        and Section 1(c) of the Other Standby Purchase Commitments: (A) the
        Standby Purchaser and the Other Standby Purchasers will first be given
        the opportunity to purchase for cash (based on the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, Units or (y) if a Rights Offering
        Adjustment shall have occurred, Rights Shares, underlying, in each case,
        a number of unexercised Rights up to the amount of Section 3(b) Rights
        in accordance with the percentages set forth in Column D of Annex I
        hereto and (B) to the extent such Units or Rights Shares, as the case
        may be, are not so purchased, the Standby Purchaser and any Other
        Standby Purchasers that are responsible for the existence of the Section
        3(b) Rights

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5

        will be required to purchase such Units or Rights Shares, as the case
        may be, pro rata based on the number of Section 3(b) Rights resulting
        from their respective transfers. Nothing in this Section 3(b) will in
        any way reduce the commitment of the Standby Purchaser specified in
        Section 1(c) above or the Unexercised Rights Commitment Amount as set
        forth in Annex I hereto.

        7. Section 4. Section 4 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               4. The Closing. (a) Notwithstanding anything to the contrary
        herein contained or the terms of the Rights or the Plan, subject to the
        conditions set forth herein, on the Effective Date the Standby
        Purchaser, in satisfaction of the Commitment, will deliver at the
        Closing (i) the aggregate Subscription Price payable upon exercise of
        any Rights exercised by it and (ii) the purchase price payable in
        consideration of any shares of Existing Arch Common Stock or, if
        applicable, Arch Class B Common Stock and, if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants to be otherwise
        purchased by it pursuant to the Commitment; provided, however, that, if
        requested by the Standby Purchaser in writing at least two business days
        prior to the Effective Date, any cash to be distributed to the Standby
        Purchaser in respect of Allowed Secured Claims pursuant to the Plan
        will, prior to the distribution thereof pursuant to the Plan and in
        accordance with the instructions included in such written request, be
        first applied, on behalf of the Standby Purchaser, to the payment of
        such amounts payable on the Effective Date as provided in this Section
        4(a).

               (b) Upon payment of the amounts payable as provided in Section
        4(a), on the Effective Date at the Closing Arch will deliver to the
        Standby Purchaser (or its designees) certificates representing the
        shares of Existing Arch Common Stock, shares of Arch Class B Common
        Stock, if applicable, and, if a Rights Offering Adjustment shall not
        have occurred, the Arch Warrants, in each case, (i) issuable upon
        exercise of any Rights exercised by the Standby Purchaser or (ii)
        otherwise purchased by the Standby Purchaser pursuant to the Commitment.
        At the Closing, Arch will also deliver to the Standby Purchaser (or its
        designees) certificates representing the Arch Warrants or Arch
        Participation Warrants, as the case may be, contemplated by Section 7
        below.

               (c) (i) Arch will deliver to the Standby Purchaser two business
        days after the expiration of the Stockholder Rights Offering a written
        notice which shall (A) specify the amounts payable at the Closing by it
        in satisfaction of the Commitment (without taking into account Section
        4(e) below), (B) specify the Maximum Reduction Number (as defined in
        Section 4(e) below, (C) specify the last date on which the notice
        referred to in Section 4(c) (ii) below may be delivered, and (D)
        indicate the matters required to be addressed in such notice.


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6

                      (ii) Within 10 business days after its receipt of the
        notice referred to in Section 4(c)(i) above, the Standby Purchaser will
        deliver to Arch and MobileMedia a written notice which shall set forth
        the Elected Reduction Number (as defined in Section 4(e) below)
        determined by the Standby Purchaser in accordance with Section 4(e)
        below.

               (d) (i) Arch will deliver to the Standby Purchaser at least five
        business days prior to the Effective Date a written notice which shall
        specify the date on which the Effective Date is to occur and the last
        date on which the notice referred to in Section 4(d)(ii) below may be
        delivered.

                      (ii) At least two business days prior to the Effective
        Date, the Standby Purchaser will deliver to Arch and MobileMedia a
        written notice which shall set forth the number of shares of Existing
        Arch Common Stock beneficially owned by it as of such date. During the
        period from the date of such notice through the Effective Date, neither
        the Standby Purchaser nor any affiliate thereof shall acquire beneficial
        ownership of, or any rights to acquire, any additional shares of
        Existing Arch Common Stock or any Unsecured Claim.

               (e) If a Rights Offering Adjustment shall have occurred,
        notwithstanding anything to the contrary herein contained, the Standby
        Purchaser may elect to reduce the number of Rights Shares required to be
        purchased by the Standby Purchaser in satisfaction of its Commitment by
        a number (the "Elected Reduction Number") of Rights Shares equal to or
        less than the product of (i) the number of shares of Existing Arch
        Common Stock to be issued by Arch in the Stockholder Rights Offering and
        (ii) the percentage in Column D of Annex I hereto specified opposite the
        Standby Purchaser's name (such product being referred to herein as the
        "Maximum Reduction Number"). Subject to the immediately preceding
        sentence, the Standby Purchaser shall determine the Elected Reduction
        Number in its sole discretion.

        8. Section 5(c). Section 5(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) there shall be effective under the Securities Act, a
        registration statement (the "Shelf Registration Statement") covering the
        resale by the Standby Purchaser of (i) all shares of Existing Arch
        Common Stock, all shares of Arch Class B Common Stock, if applicable,
        and, if a Rights Offering Adjustment shall not have occurred, all Arch
        Warrants received by the Standby Purchaser as a result of the
        transactions contemplated by the Plan (including those received upon the
        exercise of Rights and pursuant to this letter agreement), (ii) if a
        Rights Offering Adjustment shall have occurred, all Arch Participation
        Warrants received by the Standby Purchaser pursuant to this letter
        agreement, and (iii) all shares of Existing Arch Common Stock issuable
        upon conversion of any such shares of the Arch Class B Common Stock or
        exercise of any such Arch Warrants or Arch

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7

        Participation Warrants, as the case may be (the securities referred to
        in the foregoing clauses (i), (ii) and (iii) are referred to herein as
        the "Registrable Securities");

        9. Section 5(e). Section 5(e) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (e) any and all amendments or modifications to the Merger
        Agreement or any exhibit or schedule thereto (including without
        limitation the Plan, the Arch Charter Amendment, the Arch Warrant
        Agreement, the Arch Participation Warrant Agreement and the Registration
        Rights Agreement) on or after the date hereof and any consents or
        waivers delivered on or after the date hereof by Arch or MobileMedia to
        the other under the Merger Agreement (other than (i) subject to Section
        15(a) below, consents under Section 4.5 of the Merger Agreement, (ii)
        waivers of Unilateral Conditions or (iii) any amendment to the Merger
        Agreement solely to reduce the amount of the Buyer Breakup Fee) shall
        have been in form and substance reasonably satisfactory to the Standby
        Purchaser;

        10. Section 5(j). Section 5(j) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (j) (i) the shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement shall be so issued and distributed pursuant to an
        exemption from registration under the Securities Act provided by Section
        1145 of the Bankruptcy Code, and (ii)(A) the issuance of the Rights, (B)
        the issuance of the shares of Existing Arch Common Stock, the shares of
        Arch Class B Common Stock, if applicable, and, if a Rights Offering
        Adjustment shall not have occurred, the Arch Warrants upon exercise of
        the Rights, (C) the issuance to the Standby Purchaser of the shares of
        Existing Arch Common Stock, the shares of Arch Class B Common Stock, if
        applicable, and, if a Rights Offering Adjustment shall not have
        occurred, the Arch Warrants as contemplated by Section 1 and Section 3
        above and the Arch Warrants or Arch Participation Warrants, as the case
        may be, as contemplated by Section 7 below, and (D) the issuance of
        Existing Arch Common Stock upon exercise of the Arch Warrants or Arch
        Participation Warrants, as the case may be, or conversion of Arch Class
        B Common Stock, if applicable, shall be covered by the Registration
        Statement, the Registration Statement shall have been declared effective
        and no stop order with respect thereto shall be in effect;

        11. Section 5(m) of the Standby Commitment Letter is hereby deleted.

        12. Section 7. Section 7 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8

               Consideration for the Commitment. In consideration for the
        Commitment, on the Effective Date at the Closing the Standby Purchaser
        will receive its pro rata share of either (a) if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants entitling the holders
        thereof to purchase, in the aggregate, a number of shares of Existing
        Arch Common Stock equal to 2.50% of the issued and outstanding shares of
        Existing Arch Common Stock and, if applicable, Arch Class B Common
        Stock, computed on a Fully Diluted Basis (as defined in the Plan) on the
        date the "Initial Buyer Market Price" is determined in accordance with
        Schedule II to the Merger Agreement giving effect to the Plan as if the
        Effective Date had occurred on such date and assuming 21,067,110 shares
        of Existing Arch Common Stock are issued and outstanding immediately
        prior thereto or (b) if a Rights Offering Adjustment shall have
        occurred, Arch Participation Warrants entitling the holders thereof to
        purchase, in the aggregate, a number of shares of Existing Arch Common
        Stock equal to 2.50% of the issued and outstanding shares of Existing
        Arch Common Stock and, if applicable, Arch Class B Common Stock,
        computed on a Fully Diluted Basis on the Rights Offering Adjustment
        Determination Date giving effect to the Plan as if the Effective Date
        had occurred on such date and assuming 21,067,110 shares of Existing
        Arch Common Stock are issued and outstanding immediately prior thereto.
        Such Arch Warrants or Arch Participation Warrants, as the case may be,
        will be delivered to the Standby Purchaser and the Other Standby
        Purchasers, in accordance with the percentages specified in Column D of
        Annex I hereto.

        13. Section 9(a)(x). Section 9(a)(x) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (a)(x) The shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement and the shares of Existing Arch Common Stock, the
        shares of Arch Class B Common Stock, if applicable, and either the Arch
        Warrants to be issued and delivered as contemplated by Section 1 and
        Section 3 above and the Arch Warrants to be issued as contemplated by
        Section 7 above or, if a Rights Offering Adjustment shall have occurred,
        the Arch Participation Warrants to be issued as contemplated by Section
        7 above, in each case, when so issued and distributed or delivered, as
        the case may be, and the shares of Existing Arch Common Stock issued
        upon conversation of such shares of Arch Class B Common Stock, if
        applicable, when so converted in accordance with the Arch Charter
        Amendment, and either, if a Rights Offering Adjustment shall not have
        occurred, the shares of Existing Arch Common Stock issued upon exercise
        of such Arch Warrants, when issued, paid for and delivered as provided
        in the Arch Warrant Agreement or, if a Rights Offering Adjustment shall
        have occurred, the shares of Existing Arch Common Stock issued upon
        exercise of Arch Participation Warrants, when issued, paid for and
        delivered as provided in the Arch Participation Warrant Agreement, will
        be duly authorized, validly issued, fully paid, nonassessable and free
        of all preemptive rights; and


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9

        14. Section 11. Section 11 of the Standby Commitment Letter is hereby
amended to change the reference therein to "Exhibit D" to a reference to
"Exhibit D-1."

        15. Schedule A to Annex I. Schedule A to Annex I to the Standby
Commitment Letter is hereby amended to read in its entirety as Schedule A
hereto.

        16. Continuation of Standby Commitment Letter. Except as specifically
amended hereby, the Standby Commitment Letter shall continue in full force and
effect and is hereby certified and confirmed in all respects.

        17. Consent to Amendments. The Standby Purchaser hereby (a) consents to
the amendments to the Other Standby Purchase Commitments to be effected by the
letter agreements attached as Exhibit C-1 hereto, which amendments shall be
entered into simultaneously herewith, (b) consents to (i) the First Amendment
dated as of September 3, 1998 to the Merger Agreement and each of the exhibits
attached thereto and (ii) the Second Amended Joint Plan of Reorganization dated
as of September 4, 1998 and each of the exhibits attached thereto, and (c)
agrees that the form and substance thereof are reasonably satisfactory to the
Standby Purchaser.

        18. Governing Law. This letter agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without regard to
its principles of conflicts of law.

        19. Counterparts. This letter agreement may be executed in counterparts
which, taken together, shall constitute one and the same instrument.



<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10


        If the foregoing accurately reflects your understanding with respect to
the matters set forth herein, please confirm by executing and returning a copy
of this letter to the undersigned.

                                   Very truly yours,

                                   The Northwestern Mutual Life
                                     Insurance Company


                                   By:
                                      ------------------------------------
                                   Name: Steven P. Swanson
                                   Its:  Authorized Representative

                                   Address:   720 E. Wisconsin Avenue
                                              Milwaukee, WI 53202
                                              Attention: Securities Department
                                   
ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.

By:
   ----------------------------
Name:
     --------------------------
Its:
    ---------------------------

Address:       1800 West Park Drive, Suite 250
               Westborough, MA 01581
               Attn:  Chairman and Chief
                      Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA 02109
               Attn: Jay E. Bothwick



<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page


Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.

By:
   ----------------------------
Name:
     --------------------------
Its:
    ---------------------------

Address:          Fort Lee Executive Park
                  One Executive Drive, Suite 500
                  Fort Lee, NJ 07024
                  Attn:  Chairman - Restructuring

With a copy to:   Sidley & Austin
                  875 Third Avenue, Suite 1400
                  New York, NY 10022
                  Attn:  James D. Johnson
<PAGE>

                     W.R. HUFF ASSET MANAGEMENT CO., L.L.C.
                           67 Park Place, Ninth Floor
                          Morristown, New Jersey 07960

                                September 3, 1998

Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts 01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey 07024

                           Re: Amendment to Commitment

Gentlemen:

        Reference is made to the letter agreement, dated August 18, 1998 (the
"Standby Commitment Letter"), among Arch Communications Group, Inc., MobileMedia
Communications, Inc. and W.R. Huff Asset Management Co., L.L.C. Terms used
herein with initial capital letters that are not otherwise defined shall have
the meanings ascribed to such terms in the Standby Commitment Letter.

        The parties hereto hereby agree as follows:

        1. First Paragraph. The second sentence of the first paragraph of the
Standby Commitment Letter is hereby amended in its entirety to read as follows:

        It is our understanding that in connection with the Reorganization,
        among other things: (a) pursuant to the Agreement and Plan of Merger,
        dated as of the date hereof (as amended by the First Amendment thereto
        dated as of September 3, 1998 (the "Merger Agreement"), among Arch, a
        wholly owned subsidiary of Arch ("Merger Sub"), Parent and MobileMedia,
        MobileMedia will merge with and into Merger Sub, with Merger Sub
        continuing as the surviving corporation and a wholly owned subsidiary of
        Arch; (b) pursuant to the Merger Agreement, Arch will make available for
        distribution pursuant to a plan of reorganization of the Debtors in the
        form attached as Exhibit A to the Merger Agreement, with such amendments
        and modifications thereto as are made in a manner consistent with clause
        (e) of Section 5 hereto (such plan of reorganization being referred to
        herein as the "Plan"), (i) cash, (ii) shares of its Common Stock, par
        value $.01 per share ("Existing Arch Common Stock"), and (iii) either
        (A) if a Rights Offering Adjustment (as defined in Schedule II to the
        Merger Agreement) shall not have occurred, warrants entitling the
        holders thereof to purchase shares of Existing Arch Common Stock ("Arch
        Warrants"), with such Arch Warrants to be issued pursuant to, and to
        have the terms set

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2

        forth in, a warrant agreement in the form attached as Exhibit B to the
        Merger Agreement (the "Arch Warrant Agreement") or (B) if a Rights
        Offering Adjustment shall have occurred, warrants entitling the holders
        thereof to purchase shares of Existing Arch Common Stock ("Arch
        Participation Warrants"), with such Arch Participation Warrants to be
        issued pursuant to, and to have the terms set forth in, a warrant
        agreement in the form attached as Exhibit B-1 to the Merger Agreement
        (the "Arch Participation Warrant Agreement"); (c) holders of unsecured
        non-priority claims against the Debtors ("Unsecured Claims"), to the
        extent such Unsecured Claims are Allowed (as defined in the Plan), will
        receive pursuant to the Plan (i) shares of Existing Arch Common Stock
        and (ii) rights to purchase ("Rights") for cash either (A) if a Rights
        Offering Adjustment shall not have occurred, units ("Units") consisting
        of (x) shares of Existing Arch Common Stock and (y) Arch Warrants or (B)
        if a Rights Offering Adjustment shall have occurred, shares of Existing
        Arch Common Stock ("Rights Shares"); (d) holders of claims arising under
        or relating to the Credit Agreement, dated December 4, 1995, as amended,
        among MobileMedia and the other parties thereto ("Secured Claims"), to
        the extent such Secured Claims are Allowed, will receive pursuant to the
        Plan cash in an amount equal to 100% of such claims; (e) all of the
        outstanding equity interests in MobileMedia and Parent will be canceled
        without consideration and Parent will be dissolved; and (f) the
        commitments under the DIP Loan Agreement will terminate and all amounts
        owed under or in respect of the DIP Loan Agreement will be paid in full
        in cash. Arch will conduct the Stockholder Rights Offering, in which it
        will issue to holders of Buyer Stock Stockholder Rights to acquire
        shares of Existing Arch Common Stock if a Rights Offering Adjustment
        shall have occurred, and, in addition, if a Rights Offering Adjustment
        shall have occurred, immediately following the Combination, Arch will
        issue Arch Participation Warrants to the stockholders of Arch to the
        extent any Stockholder Rights issued to such Stockholder Rights Holder
        were not exercised.

        2. Section 1(a). Section 1(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) to exercise any Rights distributed to it in respect of its
        Allowed Unsecured Claims in accordance with the Plan and not thereafter
        sold or transferred as permitted by Section 3 below to purchase either
        (i) if a Rights Offering Adjustment shall not have occurred, Units or
        (ii) if a Rights Offering Adjustment shall have occurred, Rights Shares,
        to the extent that the aggregate purchase price payable upon such
        exercise, as determined in accordance with Schedule II to the Merger
        Agreement (the "Subscription Price"), does not exceed the Rights
        Exercise Commitment Amount of the Standby Purchaser as set forth in
        Annex I hereto;

        3. Section 1(b).Section 1(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3

               (b) if (i) the Standby Purchaser sells or otherwise transfers any
        or all of the (A) the Rights distributed to it in accordance with the
        Plan or (B) Unsecured Claims held by it as of the date hereof in respect
        of which Rights are to be distributed, in each case as permitted by
        Section 3 below, and (ii) the Rights sold or transferred by the Standby
        Purchaser or the Rights distributed in respect of Unsecured Claims held
        by it as of the date hereof that are hereafter sold or transferred by
        the Standby Purchaser are not exercised prior to the expiration thereof
        (at which time such Rights will be void and will no longer be
        exercisable), to purchase for cash (based upon the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, identical Units or (y) if a Rights
        Offering Adjustment shall have occurred, Rights Shares underlying, in
        each case, such unexercised Rights, to the extent that the aggregate
        purchase price therefor, together with the aggregate Subscription Price
        payable upon exercise of Rights exercised as contemplated by clause (a)
        above, does not exceed the Rights Exercise Commitment Amount of the
        Standby Purchaser as set forth in Annex I hereto; and

        4. Section 1(c). Section 1(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) if any Rights distributed in accordance with the Plan (other
        than (i) Rights distributed to the Standby Purchaser or the other
        holders of Unsecured Claims listed on Annex I hereto (the "Other Standby
        Purchasers") and retained by them (which Rights are referred to in
        Section 1(a) above and Section 1(a) of each of the Other Standby
        Purchase Commitments (as defined in Section 13(a) below)) or (ii)
        subject to Section 3(b) below, Rights distributed in respect of
        Unsecured Claims held by the Standby Purchaser or the Other Standby
        Purchasers as of the date hereof that are hereafter sold or transferred
        by them (which Rights are referred to in Sections 1(b) and 3 hereof and
        Sections 1(b) and 3 of each of the Other Standby Purchase Commitments))
        remain unexercised upon the expiration thereof (at which time such
        Rights will be void and will no longer be exercisable), to purchase for
        cash (based on the Subscription Price payable upon exercise of such
        Rights ) pro rata in accordance with and up to the Unexercised Rights
        Commitment Amount of the Standby Purchaser as set forth in Annex I
        hereto either (x) if a Rights Offering Adjustment shall not have
        occurred, identical Units or (y) if a Rights Offering Adjustment shall
        have occurred, Rights Shares, underlying, in each case, such unexercised
        Rights.

        5. Section 2(a). Section 2(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) Notwithstanding anything to the contrary herein contained, if
        the purchases by the Standby Purchaser contemplated by Section 1 above
        would cause the Standby Purchaser, the Other Standby Purchasers, and any
        other persons or entities who, when taken together with any one or more
        of the Standby Purchaser and the Other Standby 

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4

        Purchasers, would constitute a "person" or "group" as used in Section
        13(d) or Section 14(d) of the Exchange Act or Rule 13d-3 or Rule 13d-5
        promulgated thereunder, or any "affiliate" as defined in Rule 405
        promulgated under the Securities Act of any of them (collectively, the
        "Standby Class B Holders"), in the aggregate, to beneficially own on the
        effective date of the Plan (the "Effective Date") shares representing
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors or more than 49.0% of the total voting
        power of the capital stock of Arch, Arch will substitute shares of Class
        B Common Stock, par value $.01 per share, of Arch ("Arch Class B Common
        Stock"), with such Arch Class B Common Stock having the terms set forth
        in the form of Certificate of Amendment to Certificate of Incorporation
        of Arch attached as Exhibit F to the Merger Agreement (the "Arch Charter
        Amendment"), for shares of Existing Arch Common Stock so purchased on a
        one-for-one basis such that on the Effective Date the Standby Class B
        Holders, in the aggregate, will beneficially own shares representing not
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors and not more than 49.0% of the total voting
        power of the capital stock of Arch, all as provided in the Plan. For
        purposes of this letter agreement, "beneficial ownership" shall be
        determined as provided in Rule 13d-3 and Rule 13d-5 promulgated under
        the Exchange Act, except that a person or entity shall be deemed to have
        "beneficial ownership" of all securities that such person or entity has
        the right to acquire, whether such right is exercisable immediately or
        only after the passage of time.

        6. Section 3(b). Section 3(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (b) Notwithstanding the provisions of clause (Y) of the proviso
        in Section 3(a) above, the Standby Purchaser may elect to sell or
        otherwise transfer (i) any or all of the Rights distributed to it in
        accordance with the Plan or (ii) Unsecured Claims in respect of which
        Rights are to be so distributed, in either case without entering into a
        Tracking Agreement with its transferee or transferees (any Rights so
        transferred and any Rights distributed in respect of Allowed Claims so
        transferred, together with any Rights so transferred and any Rights
        distributed in respect of Allowed Claims so transferred by the Other
        Standby Purchasers pursuant to Section 3(b) of the Other Standby
        Purchase Commitments, being referred to herein collectively as
        "Untracked Rights"). Any Rights that remain unexercised upon expiration
        thereof will be deemed to be "Section 3(b) Rights" up to, but not
        exceeding, the amount of Untracked Rights. The Section 3(b) Rights shall
        be exercised as follows prior to the application of Section 1(c) above
        and Section 1(c) of the Other Standby Purchase Commitments: (A) the
        Standby Purchaser and the Other Standby Purchasers will first be given
        the opportunity to purchase for cash (based on the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, Units or (y) if a Rights Offering
        Adjustment shall have occurred, Rights Shares, underlying, in each case,
        a number of unexercised Rights up to the amount of Section 3(b) Rights
        in accordance with the percentages set forth in Column D of Annex I
        hereto and (B) to the extent such Units or

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5

        Rights Shares, as the case may be, are not so purchased, the Standby
        Purchaser and any Other Standby Purchasers that are responsible for the
        existence of the Section 3(b) Rights will be required to purchase such
        Units or Rights Shares, as the case may be, pro rata based on the number
        of Section 3(b) Rights resulting from their respective transfers.
        Nothing in this Section 3(b) will in any way reduce the commitment of
        the Standby Purchaser specified in Section 1(c) above or the Unexercised
        Rights Commitment Amount as set forth in Annex I hereto.

        7. Section 4. Section 4 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               4. The Closing. (a) Notwithstanding anything to the contrary
        herein contained or the terms of the Rights or the Plan, subject to the
        conditions set forth herein, on the Effective Date the Standby
        Purchaser, in satisfaction of the Commitment, will deliver at the
        Closing (i) the aggregate Subscription Price payable upon exercise of
        any Rights exercised by it and (ii) the purchase price payable in
        consideration of any shares of Existing Arch Common Stock or, if
        applicable, Arch Class B Common Stock and, if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants to be otherwise
        purchased by it pursuant to the Commitment; provided, however, that, if
        requested by the Standby Purchaser in writing at least two business days
        prior to the Effective Date, any cash to be distributed to the Standby
        Purchaser in respect of Allowed Secured Claims pursuant to the Plan
        will, prior to the distribution thereof pursuant to the Plan and in
        accordance with the instructions included in such written request, be
        first applied, on behalf of the Standby Purchaser, to the payment of
        such amounts payable on the Effective Date as provided in this Section
        4(a).

               (b) Upon payment of the amounts payable as provided in Section
        4(a), on the Effective Date at the Closing Arch will deliver to the
        Standby Purchaser (or its designees) certificates representing the
        shares of Existing Arch Common Stock, shares of Arch Class B Common
        Stock, if applicable, and, if a Rights Offering Adjustment shall not
        have occurred, the Arch Warrants, in each case, (i) issuable upon
        exercise of any Rights exercised by the Standby Purchaser or (ii)
        otherwise purchased by the Standby Purchaser pursuant to the Commitment.
        At the Closing, Arch will also deliver to the Standby Purchaser (or its
        designees) certificates representing the Arch Warrants or Arch
        Participation Warrants, as the case may be, contemplated by Section 7
        below.

               (c) (i) Arch will deliver to the Standby Purchaser two business
        days after the expiration of the Stockholder Rights Offering a written
        notice which shall (A) specify the amounts payable at the Closing by it
        in satisfaction of the Commitment (without taking into account Section
        4(e) below), (B) specify the Maximum Reduction Number (as defined in
        Section 4(e) below, (C) specify the last date on which the notice
        referred to in Section 4(c) (ii) below may be delivered, and (D)
        indicate the matters required to be addressed in such notice.

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6

                      (ii) Within 10 business days after its receipt of the
        notice referred to in Section 4(c)(i) above, the Standby Purchaser will
        deliver to Arch and MobileMedia a written notice which shall set forth
        the Elected Reduction Number (as defined in Section 4(e) below)
        determined by the Standby Purchaser in accordance with Section 4(e)
        below.

               (d) (i) Arch will deliver to the Standby Purchaser at least five
        business days prior to the Effective Date a written notice which shall
        specify the date on which the Effective Date is to occur and the last
        date on which the notice referred to in Section 4(d)(ii) below may be
        delivered.

                      (ii) At least two business days prior to the Effective
        Date, the Standby Purchaser will deliver to Arch and MobileMedia a
        written notice which shall set forth the number of shares of Existing
        Arch Common Stock beneficially owned by it as of such date. During the
        period from the date of such notice through the Effective Date, neither
        the Standby Purchaser nor any affiliate thereof shall acquire beneficial
        ownership of, or any rights to acquire, any additional shares of
        Existing Arch Common Stock or any Unsecured Claim.

               (e) If a Rights Offering Adjustment shall have occurred,
        notwithstanding anything to the contrary herein contained, the Standby
        Purchaser may elect to reduce the number of Rights Shares required to be
        purchased by the Standby Purchaser in satisfaction of its Commitment by
        a number (the "Elected Reduction Number") of Rights Shares equal to or
        less than the product of (i) the number of shares of Existing Arch
        Common Stock to be issued by Arch in the Stockholder Rights Offering and
        (ii) the percentage in Column D of Annex I hereto specified opposite the
        Standby Purchaser's name (such product being referred to herein as the
        "Maximum Reduction Number"). Subject to the immediately preceding
        sentence, the Standby Purchaser shall determine the Elected Reduction
        Number in its sole discretion.

        8. Section 5(c). Section 5(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) there shall be effective under the Securities Act, a
        registration statement (the "Shelf Registration Statement") covering the
        resale by the Standby Purchaser of (i) all shares of Existing Arch
        Common Stock, all shares of Arch Class B Common Stock, if applicable,
        and, if a Rights Offering Adjustment shall not have occurred, all Arch
        Warrants received by the Standby Purchaser as a result of the
        transactions contemplated by the Plan (including those received upon the
        exercise of Rights and pursuant to this letter agreement), (ii) if a
        Rights Offering Adjustment shall have occurred, all Arch Participation
        Warrants received by the Standby Purchaser pursuant to this letter
        agreement, and (iii) all shares of Existing Arch Common Stock issuable
        upon conversion of any such shares of the Arch Class B Common Stock or
        exercise of any such Arch Warrants or Arch

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7

        Participation Warrants, as the case may be (the securities referred to
        in the foregoing clauses (i), (ii) and (iii) are referred to herein as
        the "Registrable Securities");

        9. Section 5(e). Section 5(e) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (e) any and all amendments or modifications to the Merger
        Agreement or any exhibit or schedule thereto (including without
        limitation the Plan, the Arch Charter Amendment, the Arch Warrant
        Agreement, the Arch Participation Warrant Agreement and the Registration
        Rights Agreement) on or after the date hereof and any consents or
        waivers delivered on or after the date hereof by Arch or MobileMedia to
        the other under the Merger Agreement (other than (i) subject to Section
        15(a) below, consents under Section 4.5 of the Merger Agreement, (ii)
        waivers of Unilateral Conditions or (iii) any amendment to the Merger
        Agreement solely to reduce the amount of the Buyer Breakup Fee) shall
        have been in form and substance reasonably satisfactory to the Standby
        Purchaser;

        10. Section 5(j). Section 5(j) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (j) (i) the shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement shall be so issued and distributed pursuant to an
        exemption from registration under the Securities Act provided by Section
        1145 of the Bankruptcy Code, and (ii)(A) the issuance of the Rights, (B)
        the issuance of the shares of Existing Arch Common Stock, the shares of
        Arch Class B Common Stock, if applicable, and, if a Rights Offering
        Adjustment shall not have occurred, the Arch Warrants upon exercise of
        the Rights, (C) the issuance to the Standby Purchaser of the shares of
        Existing Arch Common Stock, the shares of Arch Class B Common Stock, if
        applicable, and, if a Rights Offering Adjustment shall not have
        occurred, the Arch Warrants as contemplated by Section 1 and Section 3
        above and the Arch Warrants or Arch Participation Warrants, as the case
        may be, as contemplated by Section 7 below, and (D) the issuance of
        Existing Arch Common Stock upon exercise of the Arch Warrants or Arch
        Participation Warrants, as the case may be, or conversion of Arch Class
        B Common Stock, if applicable, shall be covered by the Registration
        Statement, the Registration Statement shall have been declared effective
        and no stop order with respect thereto shall be in effect;

        11. Section 5(m) of the Standby Commitment Letter is hereby deleted.

        12. Section 7. Section 7 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8

               Consideration for the Commitment. In consideration for the
        Commitment, on the Effective Date at the Closing the Standby Purchaser
        will receive its pro rata share of either (a) if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants entitling the holders
        thereof to purchase, in the aggregate, a number of shares of Existing
        Arch Common Stock equal to 2.50% of the issued and outstanding shares of
        Existing Arch Common Stock and, if applicable, Arch Class B Common
        Stock, computed on a Fully Diluted Basis (as defined in the Plan) on the
        date the "Initial Buyer Market Price" is determined in accordance with
        Schedule II to the Merger Agreement giving effect to the Plan as if the
        Effective Date had occurred on such date and assuming 21,067,110 shares
        of Existing Arch Common Stock are issued and outstanding immediately
        prior thereto or (b) if a Rights Offering Adjustment shall have
        occurred, Arch Participation Warrants entitling the holders thereof to
        purchase, in the aggregate, a number of shares of Existing Arch Common
        Stock equal to 2.50% of the issued and outstanding shares of Existing
        Arch Common Stock and, if applicable, Arch Class B Common Stock,
        computed on a Fully Diluted Basis on the Rights Offering Adjustment
        Determination Date giving effect to the Plan as if the Effective Date
        had occurred on such date and assuming 21,067,110 shares of Existing
        Arch Common Stock are issued and outstanding immediately prior thereto.
        Such Arch Warrants or Arch Participation Warrants, as the case may be,
        will be delivered to the Standby Purchaser and the Other Standby
        Purchasers, in accordance with the percentages specified in Column D of
        Annex I hereto.

        13. Section 9(a)(x). Section 9(a)(x) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (a)(x) The shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement and the shares of Existing Arch Common Stock, the
        shares of Arch Class B Common Stock, if applicable, and either the Arch
        Warrants to be issued and delivered as contemplated by Section 1 and
        Section 3 above and the Arch Warrants to be issued as contemplated by
        Section 7 above or, if a Rights Offering Adjustment shall have occurred,
        the Arch Participation Warrants to be issued as contemplated by Section
        7 above, in each case, when so issued and distributed or delivered, as
        the case may be, and the shares of Existing Arch Common Stock issued
        upon conversation of such shares of Arch Class B Common Stock, if
        applicable, when so converted in accordance with the Arch Charter
        Amendment, and either, if a Rights Offering Adjustment shall not have
        occurred, the shares of Existing Arch Common Stock issued upon exercise
        of such Arch Warrants, when issued, paid for and delivered as provided
        in the Arch Warrant Agreement or, if a Rights Offering Adjustment shall
        have occurred, the shares of Existing Arch Common Stock issued upon
        exercise of Arch Participation Warrants, when issued, paid for and
        delivered as provided in the Arch Participation Warrant Agreement, will
        be duly authorized, validly issued, fully paid, nonassessable and free
        of all preemptive rights; and


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9

        14. Section 11. Section 11 of the Standby Commitment Letter is hereby
amended to change the reference therein to "Exhibit D" to a reference to
"Exhibit D-1."

        15. Schedule A to Annex I. Schedule A to Annex I to the Standby
Commitment Letter is hereby amended to read in its entirety as Schedule A
hereto.

        16. Continuation of Standby Commitment Letter. Except as specifically
amended hereby, the Standby Commitment Letter shall continue in full force and
effect and is hereby certified and confirmed in all respects.

        17. Consent to Amendments. The Standby Purchaser hereby (a) consents to
the amendments to the Other Standby Purchase Commitments to be effected by the
letter agreements attached as Exhibit C-1 hereto, which amendments shall be
entered into simultaneously herewith, (b) consents to (i) the First Amendment
dated as of September 3, 1998 to the Merger Agreement and each of the exhibits
attached thereto and (ii) the Second Amended Joint Plan of Reorganization dated
as of September 4, 1998 and each of the exhibits attached thereto, and (c)
agrees that the form and substance thereof are reasonably satisfactory to the
Standby Purchaser.

        18. Governing Law. This letter agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without regard to
its principles of conflicts of law.

        19. Counterparts. This letter agreement may be executed in counterparts
which, taken together, shall constitute one and the same instrument.



<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10

        If the foregoing accurately reflects your understanding with respect to
the matters set forth herein, please confirm by executing and returning a copy
of this letter to the undersigned.

                              Very truly yours,

                              W.R. Huff Asset Management Co., L.L.C.,          
                              as agent for its separate accounts and affiliates


                              By:
                                 --------------------------------
                              Name: Bryan E. Bloom, Esq.
                              Its:    Attorney-in-Fact

                              Address:       67 Park Place, 9th Floor
                                             Morristown, NJ  07960
                                             Attention: Cathy Markey, Esq.

ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.

By:
   ---------------------------------

Name:
     -------------------------------

Its:
    --------------------------------

Address:       1800 West Park Drive, Suite 250
               Westborough, MA 01581
               Attn:  Chairman and Chief
                      Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA 02109
               Attn: Jay E. Bothwick



<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11

Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.

By:
   ---------------------------------

Name:
     -------------------------------

Its:
    --------------------------------

Address:          Fort Lee Executive Park
                  One Executive Drive, Suite 500
                  Fort Lee, NJ 07024
                  Attn:  Chairman - Restructuring

With a copy to:   Sidley & Austin
                  875 Third Avenue, Suite 1400
                  New York, NY  10022
                  Attn:  James D. Johnson


<PAGE>

                          WHIPPOORWILL ASSOCIATES, INC.
                                11 Martine Avenue
                          White Plains, New York 10606


                                September 3, 1998

Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts 01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey 07024

                           Re: Amendment to Commitment

Gentlemen:

        Reference is made to the letter agreement, dated August 18, 1998 (the
"Standby Commitment Letter"), among Arch Communications Group, Inc., MobileMedia
Communications, Inc. and Whippoorwill Associates, Inc., as general partner of
and/or as agent for, each Whippoorwill Account. Terms used herein with initial
capital letters that are not otherwise defined shall have the meanings ascribed
to such terms in the Standby Commitment Letter.

        The parties hereto hereby agree as follows:

        1. First Paragraph. The second sentence of the first paragraph of the
Standby Commitment Letter is hereby amended in its entirety to read as follows:

        It is our understanding that in connection with the Reorganization,
        among other things: (a) pursuant to the Agreement and Plan of Merger,
        dated as of the date hereof (as amended by the First Amendment thereto
        dated as of September 3, 1998 (the "Merger Agreement"), among Arch, a
        wholly owned subsidiary of Arch ("Merger Sub"), Parent and MobileMedia,
        MobileMedia will merge with and into Merger Sub, with Merger Sub
        continuing as the surviving corporation and a wholly owned subsidiary of
        Arch; (b) pursuant to the Merger Agreement, Arch will make available for
        distribution pursuant to a plan of reorganization of the Debtors in the
        form attached as Exhibit A to the Merger Agreement, with such amendments
        and modifications thereto as are made in a manner consistent with clause
        (e) of Section 5 hereto (such plan of reorganization being referred to
        herein as the "Plan"), (i) cash, (ii) shares of its Common Stock, par
        value $.01 per share ("Existing Arch Common Stock"), and (iii) either
        (A) if a Rights Offering Adjustment (as defined in Schedule II to the
        Merger Agreement) shall not have occurred, warrants entitling the
        holders thereof to purchase shares of Existing Arch Common Stock ("Arch
<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2

        Warrants"), with such Arch Warrants to be issued pursuant to, and to
        have the terms set forth in, a warrant agreement in the form attached as
        Exhibit B to the Merger Agreement (the "Arch Warrant Agreement") or (B)
        if a Rights Offering Adjustment shall have occurred, warrants entitling
        the holders thereof to purchase shares of Existing Arch Common Stock
        ("Arch Participation Warrants"), with such Arch Participation Warrants
        to be issued pursuant to, and to have the terms set forth in, a warrant
        agreement in the form attached as Exhibit B-1 to the Merger Agreement
        (the "Arch Participation Warrant Agreement"); (c) holders of unsecured
        non-priority claims against the Debtors ("Unsecured Claims"), to the
        extent such Unsecured Claims are Allowed (as defined in the Plan), will
        receive pursuant to the Plan (i) shares of Existing Arch Common Stock
        and (ii) rights to purchase ("Rights") for cash either (A) if a Rights
        Offering Adjustment shall not have occurred, units ("Units") consisting
        of (x) shares of Existing Arch Common Stock and (y) Arch Warrants or (B)
        if a Rights Offering Adjustment shall have occurred, shares of Existing
        Arch Common Stock ("Rights Shares"); (d) holders of claims arising under
        or relating to the Credit Agreement, dated December 4, 1995, as amended,
        among MobileMedia and the other parties thereto ("Secured Claims"), to
        the extent such Secured Claims are Allowed, will receive pursuant to the
        Plan cash in an amount equal to 100% of such claims; (e) all of the
        outstanding equity interests in MobileMedia and Parent will be canceled
        without consideration and Parent will be dissolved; and (f) the
        commitments under the DIP Loan Agreement will terminate and all amounts
        owed under or in respect of the DIP Loan Agreement will be paid in full
        in cash. Arch will conduct the Stockholder Rights Offering, in which it
        will issue to holders of Buyer Stock Stockholder Rights to acquire
        shares of Existing Arch Common Stock if a Rights Offering Adjustment
        shall have occurred, and, in addition, if a Rights Offering Adjustment
        shall have occurred, immediately following the Combination, Arch will
        issue Arch Participation Warrants to the stockholders of Arch to the
        extent any Stockholder Rights issued to such Stockholder Rights Holder
        were not exercised.

        2. Section 1(a). Section 1(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) to exercise any Rights distributed to it in respect of its
        Allowed Unsecured Claims in accordance with the Plan and not thereafter
        sold or transferred as permitted by Section 3 below to purchase either
        (i) if a Rights Offering Adjustment shall not have occurred, Units or
        (ii) if a Rights Offering Adjustment shall have occurred, Rights Shares,
        to the extent that the aggregate purchase price payable upon such
        exercise, as determined in accordance with Schedule II to the Merger
        Agreement (the "Subscription Price"), does not exceed the Rights
        Exercise Commitment Amount of the Standby Purchaser as set forth in
        Annex I hereto;

        3. Section 1(b).Section 1(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3

               (b) if (i) the Standby Purchaser sells or otherwise transfers any
        or all of the (A) the Rights distributed to it in accordance with the
        Plan or (B) Unsecured Claims held by it as of the date hereof in respect
        of which Rights are to be distributed, in each case as permitted by
        Section 3 below, and (ii) the Rights sold or transferred by the Standby
        Purchaser or the Rights distributed in respect of Unsecured Claims held
        by it as of the date hereof that are hereafter sold or transferred by
        the Standby Purchaser are not exercised prior to the expiration thereof
        (at which time such Rights will be void and will no longer be
        exercisable), to purchase for cash (based upon the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, identical Units or (y) if a Rights
        Offering Adjustment shall have occurred, Rights Shares underlying, in
        each case, such unexercised Rights, to the extent that the aggregate
        purchase price therefor, together with the aggregate Subscription Price
        payable upon exercise of Rights exercised as contemplated by clause (a)
        above, does not exceed the Rights Exercise Commitment Amount of the
        Standby Purchaser as set forth in Annex I hereto; and

        4. Section 1(c). Section 1(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) if any Rights distributed in accordance with the Plan (other
        than (i) Rights distributed to the Standby Purchaser or the other
        holders of Unsecured Claims listed on Annex I hereto (the "Other Standby
        Purchasers") and retained by them (which Rights are referred to in
        Section 1(a) above and Section 1(a) of each of the Other Standby
        Purchase Commitments (as defined in Section 13(a) below)) or (ii)
        subject to Section 3(b) below, Rights distributed in respect of
        Unsecured Claims held by the Standby Purchaser or the Other Standby
        Purchasers as of the date hereof that are hereafter sold or transferred
        by them (which Rights are referred to in Sections 1(b) and 3 hereof and
        Sections 1(b) and 3 of each of the Other Standby Purchase Commitments))
        remain unexercised upon the expiration thereof (at which time such
        Rights will be void and will no longer be exercisable), to purchase for
        cash (based on the Subscription Price payable upon exercise of such
        Rights ) pro rata in accordance with and up to the Unexercised Rights
        Commitment Amount of the Standby Purchaser as set forth in Annex I
        hereto either (x) if a Rights Offering Adjustment shall not have
        occurred, identical Units or (y) if a Rights Offering Adjustment shall
        have occurred, Rights Shares, underlying, in each case, such unexercised
        Rights.

        5. Section 2(a). Section 2(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) Notwithstanding anything to the contrary herein contained, if
        the purchases by the Standby Purchaser contemplated by Section 1 above
        would cause the Standby Purchaser, the Other Standby Purchasers, and any
        other persons or entities who, when taken together with any one or more
        of the Standby Purchaser and the Other Standby

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4

        Purchasers, would constitute a "person" or "group" as used in Section
        13(d) or Section 14(d) of the Exchange Act or Rule 13d-3 or Rule 13d-5
        promulgated thereunder, or any "affiliate" as defined in Rule 405
        promulgated under the Securities Act of any of them (collectively, the
        "Standby Class B Holders"), in the aggregate, to beneficially own on the
        effective date of the Plan (the "Effective Date") shares representing
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors or more than 49.0% of the total voting
        power of the capital stock of Arch, Arch will substitute shares of Class
        B Common Stock, par value $.01 per share, of Arch ("Arch Class B Common
        Stock"), with such Arch Class B Common Stock having the terms set forth
        in the form of Certificate of Amendment to Certificate of Incorporation
        of Arch attached as Exhibit F to the Merger Agreement (the "Arch Charter
        Amendment"), for shares of Existing Arch Common Stock so purchased on a
        one-for-one basis such that on the Effective Date the Standby Class B
        Holders, in the aggregate, will beneficially own shares representing not
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors and not more than 49.0% of the total voting
        power of the capital stock of Arch, all as provided in the Plan. For
        purposes of this letter agreement, "beneficial ownership" shall be
        determined as provided in Rule 13d-3 and Rule 13d-5 promulgated under
        the Exchange Act, except that a person or entity shall be deemed to have
        "beneficial ownership" of all securities that such person or entity has
        the right to acquire, whether such right is exercisable immediately or
        only after the passage of time.

        6. Section 3(b). Section 3(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (b) Notwithstanding the provisions of clause (Y) of the proviso
        in Section 3(a) above, the Standby Purchaser may elect to sell or
        otherwise transfer (i) any or all of the Rights distributed to it in
        accordance with the Plan or (ii) Unsecured Claims in respect of which
        Rights are to be so distributed, in either case without entering into a
        Tracking Agreement with its transferee or transferees (any Rights so
        transferred and any Rights distributed in respect of Allowed Claims so
        transferred, together with any Rights so transferred and any Rights
        distributed in respect of Allowed Claims so transferred by the Other
        Standby Purchasers pursuant to Section 3(b) of the Other Standby
        Purchase Commitments, being referred to herein collectively as
        "Untracked Rights"). Any Rights that remain unexercised upon expiration
        thereof will be deemed to be "Section 3(b) Rights" up to, but not
        exceeding, the amount of Untracked Rights. The Section 3(b) Rights shall
        be exercised as follows prior to the application of Section 1(c) above
        and Section 1(c) of the Other Standby Purchase Commitments: (A) the
        Standby Purchaser and the Other Standby Purchasers will first be given
        the opportunity to purchase for cash (based on the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, Units or (y) if a Rights Offering
        Adjustment shall have occurred, Rights Shares, underlying, in each case,
        a number of unexercised Rights up to the amount of Section 3(b) Rights
        in accordance with the percentages set forth in Column D of Annex I
        hereto and (B) to the extent such Units or

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5

        Rights Shares, as the case may be, are not so purchased, the Standby
        Purchaser and any Other Standby Purchasers that are responsible for the
        existence of the Section 3(b) Rights will be required to purchase such
        Units or Rights Shares, as the case may be, pro rata based on the number
        of Section 3(b) Rights resulting from their respective transfers.
        Nothing in this Section 3(b) will in any way reduce the commitment of
        the Standby Purchaser specified in Section 1(c) above or the Unexercised
        Rights Commitment Amount as set forth in Annex I hereto.

        7. Section 4. Section 4 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               4. The Closing. (a) Notwithstanding anything to the contrary
        herein contained or the terms of the Rights or the Plan, subject to the
        conditions set forth herein, on the Effective Date the Standby
        Purchaser, in satisfaction of the Commitment, will deliver at the
        Closing (i) the aggregate Subscription Price payable upon exercise of
        any Rights exercised by it and (ii) the purchase price payable in
        consideration of any shares of Existing Arch Common Stock or, if
        applicable, Arch Class B Common Stock and, if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants to be otherwise
        purchased by it pursuant to the Commitment; provided, however, that, if
        requested by the Standby Purchaser in writing at least two business days
        prior to the Effective Date, any cash to be distributed to the Standby
        Purchaser in respect of Allowed Secured Claims pursuant to the Plan
        will, prior to the distribution thereof pursuant to the Plan and in
        accordance with the instructions included in such written request, be
        first applied, on behalf of the Standby Purchaser, to the payment of
        such amounts payable on the Effective Date as provided in this Section
        4(a).

               (b) Upon payment of the amounts payable as provided in Section
        4(a), on the Effective Date at the Closing Arch will deliver to the
        Standby Purchaser (or its designees) certificates representing the
        shares of Existing Arch Common Stock, shares of Arch Class B Common
        Stock, if applicable, and, if a Rights Offering Adjustment shall not
        have occurred, the Arch Warrants, in each case, (i) issuable upon
        exercise of any Rights exercised by the Standby Purchaser or (ii)
        otherwise purchased by the Standby Purchaser pursuant to the Commitment.
        At the Closing, Arch will also deliver to the Standby Purchaser (or its
        designees) certificates representing the Arch Warrants or Arch
        Participation Warrants, as the case may be, contemplated by Section 7
        below.

               (c) (i) Arch will deliver to the Standby Purchaser two business
        days after the expiration of the Stockholder Rights Offering a written
        notice which shall (A) specify the amounts payable at the Closing by it
        in satisfaction of the Commitment (without taking into account Section
        4(e) below), (B) specify the Maximum Reduction Number (as defined in
        Section 4(e) below, (C) specify the last date on which the notice
        referred to in Section 4(c) (ii) below may be delivered, and (D)
        indicate the matters required to be addressed in such notice.

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6

                      (ii) Within 10 business days after its receipt of the
        notice referred to in Section 4(c)(i) above, the Standby Purchaser will
        deliver to Arch and MobileMedia a written notice which shall set forth
        the Elected Reduction Number (as defined in Section 4(e) below)
        determined by the Standby Purchaser in accordance with Section 4(e)
        below.

               (d) (i) Arch will deliver to the Standby Purchaser at least five
        business days prior to the Effective Date a written notice which shall
        specify the date on which the Effective Date is to occur and the last
        date on which the notice referred to in Section 4(d)(ii) below may be
        delivered.

                      (ii) At least two business days prior to the Effective
        Date, the Standby Purchaser will deliver to Arch and MobileMedia a
        written notice which shall set forth the number of shares of Existing
        Arch Common Stock beneficially owned by it as of such date. During the
        period from the date of such notice through the Effective Date, neither
        the Standby Purchaser nor any affiliate thereof shall acquire beneficial
        ownership of, or any rights to acquire, any additional shares of
        Existing Arch Common Stock or any Unsecured Claim.

               (e) If a Rights Offering Adjustment shall have occurred,
        notwithstanding anything to the contrary herein contained, the Standby
        Purchaser may elect to reduce the number of Rights Shares required to be
        purchased by the Standby Purchaser in satisfaction of its Commitment by
        a number (the "Elected Reduction Number") of Rights Shares equal to or
        less than the product of (i) the number of shares of Existing Arch
        Common Stock to be issued by Arch in the Stockholder Rights Offering and
        (ii) the percentage in Column D of Annex I hereto specified opposite the
        Standby Purchaser's name (such product being referred to herein as the
        "Maximum Reduction Number"). Subject to the immediately preceding
        sentence, the Standby Purchaser shall determine the Elected Reduction
        Number in its sole discretion.

        8. Section 5(c). Section 5(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) there shall be effective under the Securities Act, a
        registration statement (the "Shelf Registration Statement") covering the
        resale by the Standby Purchaser of (i) all shares of Existing Arch
        Common Stock, all shares of Arch Class B Common Stock, if applicable,
        and, if a Rights Offering Adjustment shall not have occurred, all Arch
        Warrants received by the Standby Purchaser as a result of the
        transactions contemplated by the Plan (including those received upon the
        exercise of Rights and pursuant to this letter agreement), (ii) if a
        Rights Offering Adjustment shall have occurred, all Arch Participation
        Warrants received by the Standby Purchaser pursuant to this letter
        agreement, and (iii) all shares of Existing Arch Common Stock issuable
        upon conversion of any such shares of the Arch Class B Common Stock or
        exercise of any such Arch Warrants or Arch

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7

        Participation Warrants, as the case may be (the securities referred to
        in the foregoing clauses (i), (ii) and (iii) are referred to herein as
        the "Registrable Securities");

        9. Section 5(e). Section 5(e) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (e) any and all amendments or modifications to the Merger
        Agreement or any exhibit or schedule thereto (including without
        limitation the Plan, the Arch Charter Amendment, the Arch Warrant
        Agreement, the Arch Participation Warrant Agreement and the Registration
        Rights Agreement) on or after the date hereof and any consents or
        waivers delivered on or after the date hereof by Arch or MobileMedia to
        the other under the Merger Agreement (other than (i) subject to Section
        15(a) below, consents under Section 4.5 of the Merger Agreement, (ii)
        waivers of Unilateral Conditions or (iii) any amendment to the Merger
        Agreement solely to reduce the amount of the Buyer Breakup Fee) shall
        have been in form and substance reasonably satisfactory to the Standby
        Purchaser;

        10. Section 5(j). Section 5(j) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (j) (i) the shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement shall be so issued and distributed pursuant to an
        exemption from registration under the Securities Act provided by Section
        1145 of the Bankruptcy Code, and (ii)(A) the issuance of the Rights, (B)
        the issuance of the shares of Existing Arch Common Stock, the shares of
        Arch Class B Common Stock, if applicable, and, if a Rights Offering
        Adjustment shall not have occurred, the Arch Warrants upon exercise of
        the Rights, (C) the issuance to the Standby Purchaser of the shares of
        Existing Arch Common Stock, the shares of Arch Class B Common Stock, if
        applicable, and, if a Rights Offering Adjustment shall not have
        occurred, the Arch Warrants as contemplated by Section 1 and Section 3
        above and the Arch Warrants or Arch Participation Warrants, as the case
        may be, as contemplated by Section 7 below, and (D) the issuance of
        Existing Arch Common Stock upon exercise of the Arch Warrants or Arch
        Participation Warrants, as the case may be, or conversion of Arch Class
        B Common Stock, if applicable, shall be covered by the Registration
        Statement, the Registration Statement shall have been declared effective
        and no stop order with respect thereto shall be in effect;

        11. Section 5(m) of the Standby Commitment Letter is hereby deleted.

        12. Section 7. Section 7 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8

               Consideration for the Commitment. In consideration for the
        Commitment, on the Effective Date at the Closing the Standby Purchaser
        will receive its pro rata share of either (a) if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants entitling the holders
        thereof to purchase, in the aggregate, a number of shares of Existing
        Arch Common Stock equal to 2.50% of the issued and outstanding shares of
        Existing Arch Common Stock and, if applicable, Arch Class B Common
        Stock, computed on a Fully Diluted Basis (as defined in the Plan) on the
        date the "Initial Buyer Market Price" is determined in accordance with
        Schedule II to the Merger Agreement giving effect to the Plan as if the
        Effective Date had occurred on such date and assuming 21,067,110 shares
        of Existing Arch Common Stock are issued and outstanding immediately
        prior thereto or (b) if a Rights Offering Adjustment shall have
        occurred, Arch Participation Warrants entitling the holders thereof to
        purchase, in the aggregate, a number of shares of Existing Arch Common
        Stock equal to 2.50% of the issued and outstanding shares of Existing
        Arch Common Stock and, if applicable, Arch Class B Common Stock,
        computed on a Fully Diluted Basis on the Rights Offering Adjustment
        Determination Date giving effect to the Plan as if the Effective Date
        had occurred on such date and assuming 21,067,110 shares of Existing
        Arch Common Stock are issued and outstanding immediately prior thereto.
        Such Arch Warrants or Arch Participation Warrants, as the case may be,
        will be delivered to the Standby Purchaser and the Other Standby
        Purchasers, in accordance with the percentages specified in Column D of
        Annex I hereto.

        13. Section 9(a)(x). Section 9(a)(x) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (a)(x) The shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement and the shares of Existing Arch Common Stock, the
        shares of Arch Class B Common Stock, if applicable, and either the Arch
        Warrants to be issued and delivered as contemplated by Section 1 and
        Section 3 above and the Arch Warrants to be issued as contemplated by
        Section 7 above or, if a Rights Offering Adjustment shall have occurred,
        the Arch Participation Warrants to be issued as contemplated by Section
        7 above, in each case, when so issued and distributed or delivered, as
        the case may be, and the shares of Existing Arch Common Stock issued
        upon conversation of such shares of Arch Class B Common Stock, if
        applicable, when so converted in accordance with the Arch Charter
        Amendment, and either, if a Rights Offering Adjustment shall not have
        occurred, the shares of Existing Arch Common Stock issued upon exercise
        of such Arch Warrants, when issued, paid for and delivered as provided
        in the Arch Warrant Agreement or, if a Rights Offering Adjustment shall
        have occurred, the shares of Existing Arch Common Stock issued upon
        exercise of Arch Participation Warrants, when issued, paid for and
        delivered as provided in the Arch Participation Warrant Agreement, will
        be duly authorized, validly issued, fully paid, nonassessable and free
        of all preemptive rights; and


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9

        14. Section 11. Section 11 of the Standby Commitment Letter is hereby
amended to change the reference therein to "Exhibit D" to a reference to
"Exhibit D-1."

        15. Schedule A to Annex I. Schedule A to Annex I to the Standby
Commitment Letter is hereby amended to read in its entirety as Schedule A
hereto.

        16. Continuation of Standby Commitment Letter. Except as specifically
amended hereby, the Standby Commitment Letter shall continue in full force and
effect and is hereby certified and confirmed in all respects.

        17. Consent to Amendments. The Standby Purchaser hereby (a) consents to
the amendments to the Other Standby Purchase Commitments to be effected by the
letter agreements attached as Exhibit C-1 hereto, which amendments shall be
entered into simultaneously herewith, (b) consents to (i) the First Amendment
dated as of September 3, 1998 to the Merger Agreement and each of the exhibits
attached thereto and (ii) the Second Amended Joint Plan of Reorganization dated
as of September 4, 1998 and each of the exhibits attached thereto, and (c)
agrees that the form and substance thereof are reasonably satisfactory to the
Standby Purchaser.

        18. Governing Law. This letter agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without regard to
its principles of conflicts of law.

        19. Counterparts. This letter agreement may be executed in counterparts
which, taken together, shall constitute one and the same instrument.





<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10

        If the foregoing accurately reflects your understanding with respect to
the matters set forth herein, please confirm by executing and returning a copy
of this letter to the undersigned.

                                       Very truly yours,

                                       Whippoorwill Associates, Inc.,
                                         as general partner of and/or agent for,
                                         each Whippoorwill Account


                                       By:
                                           --------------------------------
                                       Name:
                                            -------------------------------
                                       Its:
                                           --------------------------------

                                       Address:  11 Martine Avenue
                                                 White Plains, NY  10606
                                                 Attn: David Strumwasser

ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.

By:                                  
    -------------------------------- 
Name:                                
     ------------------------------- 
Its:                                 
    -------------------------------- 

Address:       1800 West Park Drive, Suite 250
               Westborough, MA 01581
               Attn:  Chairman and Chief
                      Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA 02109
               Attn: Jay E. Bothwick



<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11

Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.

By:                                  
    -------------------------------- 
Name:                                
     ------------------------------- 
Its:                                 
    -------------------------------- 

Address:          Fort Lee Executive Park
                  One Executive Drive, Suite 500
                  Fort Lee, NJ 07024
                  Attn:  Chairman - Restructuring

With a copy to:   Sidley & Austin
                  875 Third Avenue, Suite 1400
                  New York, NY 10022
                  Attn:  James D. Johnson


<PAGE>





                     CREDIT SUISSE FIRST BOSTON CORPORATION
                         11 Madison Avenue, Fourth Floor
                            New York, New York 10010


                                September 3, 1998

Arch Communications Group, Inc.
1800 West Park Drive
Suite 250
Westborough, Massachusetts 01581

MobileMedia Communications, Inc.
Fort Lee Executive Park
One Executive Drive
Suite 500
Fort Lee, New Jersey 07024

                           Re: Amendment to Commitment

Gentlemen:

        Reference is made to the letter agreement, dated August 18, 1998 (the
"Standby Commitment Letter"), among Arch Communications Group, Inc., MobileMedia
Communications, Inc. and Credit Suisse First Boston Corporation. Terms used
herein with initial capital letters that are not otherwise defined shall have
the meanings ascribed to such terms in the Standby Commitment Letter.

        The parties hereto hereby agree as follows:

        1. First Paragraph. The second sentence of the first paragraph of the
Standby Commitment Letter is hereby amended in its entirety to read as follows:

        It is our understanding that in connection with the Reorganization,
        among other things: (a) pursuant to the Agreement and Plan of Merger,
        dated as of the date hereof (as amended by the First Amendment thereto
        dated as of September 3, 1998 (the "Merger Agreement"), among Arch, a
        wholly owned subsidiary of Arch ("Merger Sub"), Parent and MobileMedia,
        MobileMedia will merge with and into Merger Sub, with Merger Sub
        continuing as the surviving corporation and a wholly owned subsidiary of
        Arch; (b) pursuant to the Merger Agreement, Arch will make available for
        distribution pursuant to a plan of reorganization of the Debtors in the
        form attached as Exhibit A to the Merger Agreement, with such amendments
        and modifications thereto as are made in a manner consistent with clause
        (e) of Section 5 hereto (such plan of reorganization being referred to
        herein as the "Plan"), (i) cash, (ii) shares of its Common Stock, par
        value $.01 per share ("Existing Arch Common Stock"), and (iii) either
        (A) if a Rights Offering Adjustment (as defined in Schedule II to the
        Merger Agreement) shall not have occurred, warrants entitling the
        holders thereof to purchase shares of Existing Arch Common Stock ("Arch

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 2

        Warrants"), with such Arch Warrants to be issued pursuant to, and to
        have the terms set forth in, a warrant agreement in the form attached as
        Exhibit B to the Merger Agreement (the "Arch Warrant Agreement") or (B)
        if a Rights Offering Adjustment shall have occurred, warrants entitling
        the holders thereof to purchase shares of Existing Arch Common Stock
        ("Arch Participation Warrants"), with such Arch Participation Warrants
        to be issued pursuant to, and to have the terms set forth in, a warrant
        agreement in the form attached as Exhibit B-1 to the Merger Agreement
        (the "Arch Participation Warrant Agreement"); (c) holders of unsecured
        non-priority claims against the Debtors ("Unsecured Claims"), to the
        extent such Unsecured Claims are Allowed (as defined in the Plan), will
        receive pursuant to the Plan (i) shares of Existing Arch Common Stock
        and (ii) rights to purchase ("Rights") for cash either (A) if a Rights
        Offering Adjustment shall not have occurred, units ("Units") consisting
        of (x) shares of Existing Arch Common Stock and (y) Arch Warrants or (B)
        if a Rights Offering Adjustment shall have occurred, shares of Existing
        Arch Common Stock ("Rights Shares"); (d) holders of claims arising under
        or relating to the Credit Agreement, dated December 4, 1995, as amended,
        among MobileMedia and the other parties thereto ("Secured Claims"), to
        the extent such Secured Claims are Allowed, will receive pursuant to the
        Plan cash in an amount equal to 100% of such claims; (e) all of the
        outstanding equity interests in MobileMedia and Parent will be canceled
        without consideration and Parent will be dissolved; and (f) the
        commitments under the DIP Loan Agreement will terminate and all amounts
        owed under or in respect of the DIP Loan Agreement will be paid in full
        in cash. Arch will conduct the Stockholder Rights Offering, in which it
        will issue to holders of Buyer Stock Stockholder Rights to acquire
        shares of Existing Arch Common Stock if a Rights Offering Adjustment
        shall have occurred, and, in addition, if a Rights Offering Adjustment
        shall have occurred, immediately following the Combination, Arch will
        issue Arch Participation Warrants to the stockholders of Arch to the
        extent any Stockholder Rights issued to such Stockholder Rights Holder
        were not exercised.

        2. Section 1(a). Section 1(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) to exercise any Rights distributed to it in respect of its
        Allowed Unsecured Claims in accordance with the Plan and not thereafter
        sold or transferred as permitted by Section 3 below to purchase either
        (i) if a Rights Offering Adjustment shall not have occurred, Units or
        (ii) if a Rights Offering Adjustment shall have occurred, Rights Shares,
        to the extent that the aggregate purchase price payable upon such
        exercise, as determined in accordance with Schedule II to the Merger
        Agreement (the "Subscription Price"), does not exceed the Rights
        Exercise Commitment Amount of the Standby Purchaser as set forth in
        Annex I hereto;

        3. Section 1(b).Section 1(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 3

               (b) if (i) the Standby Purchaser sells or otherwise transfers any
        or all of the (A) the Rights distributed to it in accordance with the
        Plan or (B) Unsecured Claims held by it as of the date hereof in respect
        of which Rights are to be distributed, in each case as permitted by
        Section 3 below, and (ii) the Rights sold or transferred by the Standby
        Purchaser or the Rights distributed in respect of Unsecured Claims held
        by it as of the date hereof that are hereafter sold or transferred by
        the Standby Purchaser are not exercised prior to the expiration thereof
        (at which time such Rights will be void and will no longer be
        exercisable), to purchase for cash (based upon the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, identical Units or (y) if a Rights
        Offering Adjustment shall have occurred, Rights Shares underlying, in
        each case, such unexercised Rights, to the extent that the aggregate
        purchase price therefor, together with the aggregate Subscription Price
        payable upon exercise of Rights exercised as contemplated by clause (a)
        above, does not exceed the Rights Exercise Commitment Amount of the
        Standby Purchaser as set forth in Annex I hereto; and

        4. Section 1(c). Section 1(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) if any Rights distributed in accordance with the Plan (other
        than (i) Rights distributed to the Standby Purchaser or the other
        holders of Unsecured Claims listed on Annex I hereto (the "Other Standby
        Purchasers") and retained by them (which Rights are referred to in
        Section 1(a) above and Section 1(a) of each of the Other Standby
        Purchase Commitments (as defined in Section 13(a) below)) or (ii)
        subject to Section 3(b) below, Rights distributed in respect of
        Unsecured Claims held by the Standby Purchaser or the Other Standby
        Purchasers as of the date hereof that are hereafter sold or transferred
        by them (which Rights are referred to in Sections 1(b) and 3 hereof and
        Sections 1(b) and 3 of each of the Other Standby Purchase Commitments))
        remain unexercised upon the expiration thereof (at which time such
        Rights will be void and will no longer be exercisable), to purchase for
        cash (based on the Subscription Price payable upon exercise of such
        Rights ) pro rata in accordance with and up to the Unexercised Rights
        Commitment Amount of the Standby Purchaser as set forth in Annex I
        hereto either (x) if a Rights Offering Adjustment shall not have
        occurred, identical Units or (y) if a Rights Offering Adjustment shall
        have occurred, Rights Shares, underlying, in each case, such unexercised
        Rights.

        5. Section 2(a). Section 2(a) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (a) Notwithstanding anything to the contrary herein contained, if
        the purchases by the Standby Purchaser contemplated by Section 1 above
        would cause the Standby Purchaser, the Other Standby Purchasers, and any
        other persons or entities who, when taken together with any one or more
        of the Standby Purchaser and the Other Standby 

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 4

        Purchasers, would constitute a "person" or "group" as used in Section
        13(d) or Section 14(d) of the Exchange Act or Rule 13d-3 or Rule 13d-5
        promulgated thereunder, or any "affiliate" as defined in Rule 405
        promulgated under the Securities Act of any of them (collectively, the
        "Standby Class B Holders"), in the aggregate, to beneficially own on the
        effective date of the Plan (the "Effective Date") shares representing
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors or more than 49.0% of the total voting
        power of the capital stock of Arch, Arch will substitute shares of Class
        B Common Stock, par value $.01 per share, of Arch ("Arch Class B Common
        Stock"), with such Arch Class B Common Stock having the terms set forth
        in the form of Certificate of Amendment to Certificate of Incorporation
        of Arch attached as Exhibit F to the Merger Agreement (the "Arch Charter
        Amendment"), for shares of Existing Arch Common Stock so purchased on a
        one-for-one basis such that on the Effective Date the Standby Class B
        Holders, in the aggregate, will beneficially own shares representing not
        more than 49.0% of the capital stock of Arch generally entitled to vote
        in the election of directors and not more than 49.0% of the total voting
        power of the capital stock of Arch, all as provided in the Plan. For
        purposes of this letter agreement, "beneficial ownership" shall be
        determined as provided in Rule 13d-3 and Rule 13d-5 promulgated under
        the Exchange Act, except that a person or entity shall be deemed to have
        "beneficial ownership" of all securities that such person or entity has
        the right to acquire, whether such right is exercisable immediately or
        only after the passage of time.

        6. Section 3(b). Section 3(b) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (b) Notwithstanding the provisions of clause (Y) of the proviso
        in Section 3(a) above, the Standby Purchaser may elect to sell or
        otherwise transfer (i) any or all of the Rights distributed to it in
        accordance with the Plan or (ii) Unsecured Claims in respect of which
        Rights are to be so distributed, in either case without entering into a
        Tracking Agreement with its transferee or transferees (any Rights so
        transferred and any Rights distributed in respect of Allowed Claims so
        transferred, together with any Rights so transferred and any Rights
        distributed in respect of Allowed Claims so transferred by the Other
        Standby Purchasers pursuant to Section 3(b) of the Other Standby
        Purchase Commitments, being referred to herein collectively as
        "Untracked Rights"). Any Rights that remain unexercised upon expiration
        thereof will be deemed to be "Section 3(b) Rights" up to, but not
        exceeding, the amount of Untracked Rights. The Section 3(b) Rights shall
        be exercised as follows prior to the application of Section 1(c) above
        and Section 1(c) of the Other Standby Purchase Commitments: (A) the
        Standby Purchaser and the Other Standby Purchasers will first be given
        the opportunity to purchase for cash (based on the Subscription Price
        payable upon exercise of such Rights) either (x) if a Rights Offering
        Adjustment shall not have occurred, Units or (y) if a Rights Offering
        Adjustment shall have occurred, Rights Shares, underlying, in each case,
        a number of unexercised Rights up to the amount of Section 3(b) Rights
        in accordance with the percentages set forth in Column D of Annex I
        hereto and (B) to the extent such Units or

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 5

        Rights Shares, as the case may be, are not so purchased, the Standby
        Purchaser and any Other Standby Purchasers that are responsible for the
        existence of the Section 3(b) Rights will be required to purchase such
        Units or Rights Shares, as the case may be, pro rata based on the number
        of Section 3(b) Rights resulting from their respective transfers.
        Nothing in this Section 3(b) will in any way reduce the commitment of
        the Standby Purchaser specified in Section 1(c) above or the Unexercised
        Rights Commitment Amount as set forth in Annex I hereto.

        7. Section 4. Section 4 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               4. The Closing. (a) Notwithstanding anything to the contrary
        herein contained or the terms of the Rights or the Plan, subject to the
        conditions set forth herein, on the Effective Date the Standby
        Purchaser, in satisfaction of the Commitment, will deliver at the
        Closing (i) the aggregate Subscription Price payable upon exercise of
        any Rights exercised by it and (ii) the purchase price payable in
        consideration of any shares of Existing Arch Common Stock or, if
        applicable, Arch Class B Common Stock and, if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants to be otherwise
        purchased by it pursuant to the Commitment; provided, however, that, if
        requested by the Standby Purchaser in writing at least two business days
        prior to the Effective Date, any cash to be distributed to the Standby
        Purchaser in respect of Allowed Secured Claims pursuant to the Plan
        will, prior to the distribution thereof pursuant to the Plan and in
        accordance with the instructions included in such written request, be
        first applied, on behalf of the Standby Purchaser, to the payment of
        such amounts payable on the Effective Date as provided in this Section
        4(a).

               (b) Upon payment of the amounts payable as provided in Section
        4(a), on the Effective Date at the Closing Arch will deliver to the
        Standby Purchaser (or its designees) certificates representing the
        shares of Existing Arch Common Stock, shares of Arch Class B Common
        Stock, if applicable, and, if a Rights Offering Adjustment shall not
        have occurred, the Arch Warrants, in each case, (i) issuable upon
        exercise of any Rights exercised by the Standby Purchaser or (ii)
        otherwise purchased by the Standby Purchaser pursuant to the Commitment.
        At the Closing, Arch will also deliver to the Standby Purchaser (or its
        designees) certificates representing the Arch Warrants or Arch
        Participation Warrants, as the case may be, contemplated by Section 7
        below.

               (c) (i) Arch will deliver to the Standby Purchaser two business
        days after the expiration of the Stockholder Rights Offering a written
        notice which shall (A) specify the amounts payable at the Closing by it
        in satisfaction of the Commitment (without taking into account Section
        4(e) below), (B) specify the Maximum Reduction Number (as defined in
        Section 4(e) below, (C) specify the last date on which the notice
        referred to in Section 4(c) (ii) below may be delivered, and (D)
        indicate the matters required to be addressed in such notice.

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 6

                      (ii) Within 10 business days after its receipt of the
        notice referred to in Section 4(c)(i) above, the Standby Purchaser will
        deliver to Arch and MobileMedia a written notice which shall set forth
        the Elected Reduction Number (as defined in Section 4(e) below)
        determined by the Standby Purchaser in accordance with Section 4(e)
        below.

               (d) (i) Arch will deliver to the Standby Purchaser at least five
        business days prior to the Effective Date a written notice which shall
        specify the date on which the Effective Date is to occur and the last
        date on which the notice referred to in Section 4(d)(ii) below may be
        delivered.

                      (ii) At least two business days prior to the Effective
        Date, the Standby Purchaser will deliver to Arch and MobileMedia a
        written notice which shall set forth the number of shares of Existing
        Arch Common Stock beneficially owned by it as of such date. During the
        period from the date of such notice through the Effective Date, neither
        the Standby Purchaser nor any affiliate thereof shall acquire beneficial
        ownership of, or any rights to acquire, any additional shares of
        Existing Arch Common Stock or any Unsecured Claim.

               (e) If a Rights Offering Adjustment shall have occurred,
        notwithstanding anything to the contrary herein contained, the Standby
        Purchaser may elect to reduce the number of Rights Shares required to be
        purchased by the Standby Purchaser in satisfaction of its Commitment by
        a number (the "Elected Reduction Number") of Rights Shares equal to or
        less than the product of (i) the number of shares of Existing Arch
        Common Stock to be issued by Arch in the Stockholder Rights Offering and
        (ii) the percentage in Column D of Annex I hereto specified opposite the
        Standby Purchaser's name (such product being referred to herein as the
        "Maximum Reduction Number"). Subject to the immediately preceding
        sentence, the Standby Purchaser shall determine the Elected Reduction
        Number in its sole discretion.

        8. Section 5(c). Section 5(c) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (c) there shall be effective under the Securities Act, a
        registration statement (the "Shelf Registration Statement") covering the
        resale by the Standby Purchaser of (i) all shares of Existing Arch
        Common Stock, all shares of Arch Class B Common Stock, if applicable,
        and, if a Rights Offering Adjustment shall not have occurred, all Arch
        Warrants received by the Standby Purchaser as a result of the
        transactions contemplated by the Plan (including those received upon the
        exercise of Rights and pursuant to this letter agreement), (ii) if a
        Rights Offering Adjustment shall have occurred, all Arch Participation
        Warrants received by the Standby Purchaser pursuant to this letter
        agreement, and (iii) all shares of Existing Arch Common Stock issuable
        upon conversion of any such shares of the Arch Class B Common Stock or
        exercise of any such Arch Warrants or Arch

<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 7

        Participation Warrants, as the case may be (the securities referred to
        in the foregoing clauses (i), (ii) and (iii) are referred to herein as
        the "Registrable Securities");

        9. Section 5(e). Section 5(e) of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:

               (e) any and all amendments or modifications to the Merger
        Agreement or any exhibit or schedule thereto (including without
        limitation the Plan, the Arch Charter Amendment, the Arch Warrant
        Agreement, the Arch Participation Warrant Agreement and the Registration
        Rights Agreement) on or after the date hereof and any consents or
        waivers delivered on or after the date hereof by Arch or MobileMedia to
        the other under the Merger Agreement (other than (i) subject to Section
        15(a) below, consents under Section 4.5 of the Merger Agreement, (ii)
        waivers of Unilateral Conditions or (iii) any amendment to the Merger
        Agreement solely to reduce the amount of the Buyer Breakup Fee) shall
        have been in form and substance reasonably satisfactory to the Standby
        Purchaser;

        10. Section 5(j). Section 5(j) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (j) (i) the shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement shall be so issued and distributed pursuant to an
        exemption from registration under the Securities Act provided by Section
        1145 of the Bankruptcy Code, and (ii)(A) the issuance of the Rights, (B)
        the issuance of the shares of Existing Arch Common Stock, the shares of
        Arch Class B Common Stock, if applicable, and, if a Rights Offering
        Adjustment shall not have occurred, the Arch Warrants upon exercise of
        the Rights, (C) the issuance to the Standby Purchaser of the shares of
        Existing Arch Common Stock, the shares of Arch Class B Common Stock, if
        applicable, and, if a Rights Offering Adjustment shall not have
        occurred, the Arch Warrants as contemplated by Section 1 and Section 3
        above and the Arch Warrants or Arch Participation Warrants, as the case
        may be, as contemplated by Section 7 below, and (D) the issuance of
        Existing Arch Common Stock upon exercise of the Arch Warrants or Arch
        Participation Warrants, as the case may be, or conversion of Arch Class
        B Common Stock, if applicable, shall be covered by the Registration
        Statement, the Registration Statement shall have been declared effective
        and no stop order with respect thereto shall be in effect;

        11. Section 5(m) of the Standby Commitment Letter is hereby deleted.

        12. Section 7. Section 7 of the Standby Commitment Letter is hereby
amended in its entirety to read as follows:


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 8

               Consideration for the Commitment. In consideration for the
        Commitment, on the Effective Date at the Closing the Standby Purchaser
        will receive its pro rata share of either (a) if a Rights Offering
        Adjustment shall not have occurred, Arch Warrants entitling the holders
        thereof to purchase, in the aggregate, a number of shares of Existing
        Arch Common Stock equal to 2.50% of the issued and outstanding shares of
        Existing Arch Common Stock and, if applicable, Arch Class B Common
        Stock, computed on a Fully Diluted Basis (as defined in the Plan) on the
        date the "Initial Buyer Market Price" is determined in accordance with
        Schedule II to the Merger Agreement giving effect to the Plan as if the
        Effective Date had occurred on such date and assuming 21,067,110 shares
        of Existing Arch Common Stock are issued and outstanding immediately
        prior thereto or (b) if a Rights Offering Adjustment shall have
        occurred, Arch Participation Warrants entitling the holders thereof to
        purchase, in the aggregate, a number of shares of Existing Arch Common
        Stock equal to 2.50% of the issued and outstanding shares of Existing
        Arch Common Stock and, if applicable, Arch Class B Common Stock,
        computed on a Fully Diluted Basis on the Rights Offering Adjustment
        Determination Date giving effect to the Plan as if the Effective Date
        had occurred on such date and assuming 21,067,110 shares of Existing
        Arch Common Stock are issued and outstanding immediately prior thereto.
        Such Arch Warrants or Arch Participation Warrants, as the case may be,
        will be delivered to the Standby Purchaser and the Other Standby
        Purchasers, in accordance with the percentages specified in Column D of
        Annex I hereto.

        13. Section 9(a)(x). Section 9(a)(x) of the Standby Commitment Letter is
hereby amended in its entirety to read as follows:

               (a)(x) The shares of Existing Arch Common Stock to be issued and
        distributed as contemplated by Section 1.3(e) and Section 1.6 of the
        Merger Agreement and the shares of Existing Arch Common Stock, the
        shares of Arch Class B Common Stock, if applicable, and either the Arch
        Warrants to be issued and delivered as contemplated by Section 1 and
        Section 3 above and the Arch Warrants to be issued as contemplated by
        Section 7 above or, if a Rights Offering Adjustment shall have occurred,
        the Arch Participation Warrants to be issued as contemplated by Section
        7 above, in each case, when so issued and distributed or delivered, as
        the case may be, and the shares of Existing Arch Common Stock issued
        upon conversation of such shares of Arch Class B Common Stock, if
        applicable, when so converted in accordance with the Arch Charter
        Amendment, and either, if a Rights Offering Adjustment shall not have
        occurred, the shares of Existing Arch Common Stock issued upon exercise
        of such Arch Warrants, when issued, paid for and delivered as provided
        in the Arch Warrant Agreement or, if a Rights Offering Adjustment shall
        have occurred, the shares of Existing Arch Common Stock issued upon
        exercise of Arch Participation Warrants, when issued, paid for and
        delivered as provided in the Arch Participation Warrant Agreement, will
        be duly authorized, validly issued, fully paid, nonassessable and free
        of all preemptive rights; and


<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 9

        14. Section 11. Section 11 of the Standby Commitment Letter is hereby
amended to change the reference therein to "Exhibit D" to a reference to
"Exhibit D-1."

        15. Schedule A to Annex I. Schedule A to Annex I to the Standby
Commitment Letter is hereby amended to read in its entirety as Schedule A
hereto.

        16. Continuation of Standby Commitment Letter. Except as specifically
amended hereby, the Standby Commitment Letter shall continue in full force and
effect and is hereby certified and confirmed in all respects.

        17. Consent to Amendments. The Standby Purchaser hereby (a) consents to
the amendments to the Other Standby Purchase Commitments to be effected by the
letter agreements attached as Exhibit C-1 hereto, which amendments shall be
entered into simultaneously herewith, (b) consents to (i) the First Amendment
dated as of September 3, 1998 to the Merger Agreement and each of the exhibits
attached thereto and (ii) the Second Amended Joint Plan of Reorganization dated
as of September 4, 1998 and each of the exhibits attached thereto, and (c)
agrees that the form and substance thereof are reasonably satisfactory to the
Standby Purchaser.

        18. Governing Law. This letter agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without regard to
its principles of conflicts of law.

        19. Counterparts. This letter agreement may be executed in counterparts
which, taken together, shall constitute one and the same instrument.





<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 10

        If the foregoing accurately reflects your understanding with respect to
the matters set forth herein, please confirm by executing and returning a copy
of this letter to the undersigned.

                              Very truly yours,                         
                                                                        
                              Credit Suisse First Boston Corporation    
                                                                        
                                                                        
                              By:                                       
                                 -----------------------------------    
                                                                        
                              Name: Alex Lagetko                        
                                                                        
                              Its: Director                             
                                                                        
                              Address:       11 Madison Avenue          
                                             New York, NY  10010        
                                             Attention: David J. Matlin 
                                                        Alex Lagetko    
                                                                        
                              With a copy to:                           
                                                                        
                              Cadwalader, Wickersham & Taft             
                              100 Maiden Lane                           
                              New York, NY 10038                        
                              Attn:  Michael J. Sage                    
                              



<PAGE>


Arch Communications Group, Inc.
MobileMedia Communications, Inc.
Page 11

ACCEPTED AND AGREED TO:

Arch Communications Group, Inc.

By:
   ----------------------------

Name:
     --------------------------

Its:
    ---------------------------

Address:       1800 West Park Drive, Suite 250
               Westborough, MA 01581
               Attn:  Chairman and Chief
                      Executive Officer

With copy to:  Hale and Dorr LLP
               60 State Street
               Boston, MA 02109
               Attn: Jay E. Bothwick


Subject to entry of the Confirmation Order:

MobileMedia Communications, Inc.

By:
   ----------------------------

Name:
     --------------------------

Its:
    ---------------------------


Address:          Fort Lee Executive Park
                  One Executive Drive, Suite 500
                  Fort Lee, NJ 07024
                  Attn:  Chairman - Restructuring

With a copy to:   Sidley & Austin
                  875 Third Avenue, Suite 1400
                  New York, NY  10022
                  Attn:  James D. Johnson



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