AT&T CORP
S-4, 1999-03-26
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 26, 1999
                                                    REGISTRATION NO. 333-      .
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                                   AT&T CORP.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                <C>                                <C>
             NEW YORK                             4811                            13-4924710
 (STATE OR OTHER JURISDICTION OF      (PRIMARY STANDARD INDUSTRIAL             (I.R.S. EMPLOYER
  INCORPORATION OR ORGANIZATION)      CLASSIFICATION CODE NUMBER)            IDENTIFICATION NO.)
</TABLE>
 
                            ------------------------
 
    32 AVENUE OF THE AMERICAS, NEW YORK, NEW YORK, 10013-2412 (212) 387-5400
    (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                  OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
                            MARILYN J. WASSER, ESQ.
                      VICE PRESIDENT -- LAW AND SECRETARY
                                   AT&T CORP.
                             295 NORTH MAPLE AVENUE
                            BASKING RIDGE, NJ 07920
                                 (908) 221-2000
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
 
                        COPIES OF ALL COMMUNICATIONS TO:
 
<TABLE>
<S>                                <C>                                <C>
       DAVID M. SILK, ESQ.               MARK D. GERSTEIN, ESQ.           RICHARD C. ROWLENSON, ESQ.
  WACHTELL, LIPTON, ROSEN & KATZ            LATHAM & WATKINS           VANGUARD CELLULAR SYSTEMS, INC.
       51 WEST 52ND STREET              SEARS TOWER, SUITE 5800       2002 PISGAH CHURCH ROAD, SUITE 300
     NEW YORK, NEW YORK 10019            233 SOUTH WACKER DRIVE        GREENSBORO, NORTH CAROLINA 27455
          (212) 403-1000              CHICAGO, ILLINOIS 60606-6401              (336) 282-3690
                                             (312) 876-7700
</TABLE>
 
                            ------------------------
 
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC:  As soon as
practicable after the effective time of this Registration Statement and the
effective time of the merger (the "Merger") of a subsidiary of AT&T Corp. and
Vanguard Cellular Systems, Inc. as described in the Amended and Restated
Agreement and Plan of Merger, dated as of October 2, 1998, by and among AT&T
Corp., Winston, Inc. and Vanguard Cellular Systems, Inc. (the "Merger
Agreement"), attached as Appendix A to the Proxy Statement/Prospectus forming a
part of this Registration Statement.
 
    If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box.  [ ]
 
    If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act of 1933, as amended, check the
following box and list the Securities Act registration statement number of the
earlier effective registration statement for the same offering.  [ ]
 
    If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------
                                                              PROPOSED                PROPOSED
    TITLE OF EACH CLASS OF          AMOUNT TO BE          MAXIMUM OFFERING        MAXIMUM AGGREGATE           AMOUNT OF
 SECURITIES TO BE REGISTERED         REGISTERED            PRICE PER SHARE         OFFERING PRICE         REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------------------------------
<S>                            <C>                     <C>                     <C>                     <C>
Common Stock, par value $1.00
  per share...................      12,637,514(1)              N/A(2)                  N/A(3)                 $0(3)(4)
- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
    (1) Represents 50% of the sum of the number of shares of common stock of
        Vanguard (the "Vanguard Shares") outstanding on March 25, 1999 plus the
        number of Vanguard Shares subject to stock options that will be
        exercisable prior to the effective time of the Merger, multiplied by the
        exchange ratio of 0.59805. The amount to be registered has been adjusted
        to reflect AT&T's announced three-for-two split of its common stock.
 
    (2) Not applicable.
 
    (3) Pursuant to Rules 457(f)(1) and (3) and 457(c) of the Securities Act,
        and solely for purposes of calculating the registration fee, the
        registration fee was computed on the basis of the average high and low
        prices of Vanguard Shares as reported on the NASDAQ/NM on March 23,
        1999, less the amount of cash to be paid by AT&T in connection with the
        Merger.
 
    (4) Pursuant to Rule 0-11(a)(2) under the Securities Exchange Act of 1934,
        as amended, the total registration fee of $177,702.82 was reduced in
        amount by $191,917.65, the filing fee paid by Vanguard pursuant to
        Exchange Act Rule 0-11 in connection with the filing of the preliminary
        proxy materials of Vanguard with the Securities and Exchange Commission
        on December 10, 1998.
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING
PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
                        [VANGUARD CELLULAR SYSTEMS LOGO]
 
Dear Vanguard Shareholder:
 
     The Board of Directors of Vanguard Cellular Systems, Inc. has unanimously
approved a merger with AT&T Corp.
 
     For each Vanguard share you own, you may request to receive in the merger
either: (1) 0.59805 shares of AT&T common stock OR (2) $23.00 in cash. The
0.59805 exchange ratio has been adjusted to reflect the previously announced
three-for-two stock split of AT&T common stock. Our ability to grant your
request will be determined by how many shareholders request AT&T shares versus
how many request cash. We must ensure that 50% of the outstanding non-dissenting
Vanguard shares are exchanged for AT&T shares and the remaining 50% are
exchanged for cash. If we are unable to grant your request, you will receive a
mixture of AT&T shares and cash for your Vanguard shares. AT&T shares are listed
on the New York Stock Exchange under the symbol "T."
 
     The merger cannot be completed unless holders of a majority of the
outstanding Vanguard shares vote to approve the merger. We have scheduled a
special meeting of Vanguard shareholders to obtain this vote, and shareholders
who owned Vanguard shares as of March 22, 1999 may vote at this special meeting.
The Board of Directors of Vanguard unanimously recommends that you vote "FOR"
approval of the merger at the special meeting.
 
     Whether or not you plan to attend the special meeting, please take the time
to vote by promptly completing, signing and dating the enclosed white proxy card
and mailing it in the white postage-paid envelope to the American Stock Transfer
& Trust Company. Even if you return the proxy card, you may attend the special
meeting and vote your shares in person. IF YOU FAIL TO RETURN THE PROXY CARD OR
VOTE IN PERSON AT THE SPECIAL MEETING, IT WILL HAVE THE SAME EFFECT AS A VOTE
AGAINST THE MERGER.
 
     The date, time and place of the special meeting are as follows:
 
          April 27, 1999
          9:00 a.m. local time
          Offices of Vanguard
          2002 Pisgah Church Road, Suite 300
          Greensboro, North Carolina 27455-3314
 
                                         Sincerely,
                                         /s/ Haynes G. Griffin
 
                                         Haynes G. Griffin
                                         Chairman of the Board
 
     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED THE AT&T SHARES TO BE ISSUED UNDER THE
PROXY STATEMENT/PROSPECTUS OR DETERMINED WHETHER THE PROXY STATEMENT/PROSPECTUS
IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.
 
     The proxy statement/prospectus is dated March 26, 1999, and was first
mailed to shareholders of Vanguard on or about March 27, 1999.
<PAGE>   3
 
                        VANGUARD CELLULAR SYSTEMS, INC.
                            2002 PISGAH CHURCH ROAD
                        GREENSBORO, NORTH CAROLINA 27455
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
 
                            Date: April 27, 1999
                            Time: 9:00 a.m. local time
                           Place: Offices of Vanguard
                                  2002 Pisgah Church Road, Suite 300
                                  Greensboro, North Carolina 27455-3314
 
PURPOSE OF THE MEETING:
 
     - To consider and vote upon the Amended and Restated Agreement and Plan of
       Merger, dated as of October 2, 1998, by and among Vanguard, AT&T and
       Winston, Inc. (a wholly owned subsidiary of AT&T), and the merger of
       Vanguard with and into Winston, Inc. contemplated thereby.
 
     - To consider any other matters that may be properly brought before the
       meeting.
 
     THE BOARD OF DIRECTORS OF VANGUARD HAS UNANIMOUSLY ADOPTED AND APPROVED THE
MERGER AGREEMENT AND THE MERGER AS IN THE BEST INTERESTS OF VANGUARD AND ITS
SHAREHOLDERS AND UNANIMOUSLY RECOMMENDS THAT YOU VOTE "FOR" APPROVAL OF THE
MERGER AGREEMENT, INCLUDING THE PLAN OF MERGER THAT IS PART OF THE MERGER
AGREEMENT, AND THE MERGER.
 
     You are entitled to assert dissenters' rights under Article 13 of the North
Carolina Business Corporation Act, but must follow certain procedures strictly
in order to do so. A copy of Article 13, which sets forth such procedures, is
attached as Appendix D to this proxy statement/prospectus.
 
     The merger is explained in the accompanying proxy statement/prospectus,
which you are urged to read carefully. A copy of the Amended and Restated
Agreement and Plan of Merger is attached as Appendix A to the proxy
statement/prospectus.
 
                                          By Order of the Board of Directors
                                          /s/ Richard C. Rowlenson
 
                                          Richard C. Rowlenson
                                          Secretary
 
March 26, 1999
<PAGE>   4
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                     PAGE
                                     ----
<S>                                  <C>
QUESTIONS AND ANSWERS ABOUT THE
  MERGER...........................    1
SUMMARY............................    4
  The Companies....................    4
  The Special Meeting..............    4
  The Merger and the Merger
     Agreement.....................    5
  Other Agreements.................    7
  Comparative Per Share Market
     Price and Dividend
     Information...................    8
  Selected Historical Financial
     Information...................    9
  Selected Pro Forma Condensed
     Financial Information.........   11
  Unaudited Comparative Per Share
     Data..........................   12
CAUTIONARY STATEMENT REGARDING
  FORWARD-LOOKING STATEMENTS.......   13
THE COMPANIES......................   15
  AT&T.............................   15
  Winston, Inc.....................   16
  Vanguard.........................   16
THE SPECIAL MEETING................   17
  General..........................   17
  Record Date and Voting...........   17
  Voting and Revocation of
     Proxies.......................   18
THE MERGER.........................   20
  Background.......................   20
  Vanguard's Reasons for the
     Merger; Recommendation of the
     Vanguard Board................   22
  Opinion of the Financial Advisor
     to the Vanguard Board.........   23
  AT&T's Reasons for the Merger....   28
  Effective Time of the Merger.....   29
  Certificate of Incorporation and
     Bylaws........................   29
  Directors and Officers...........   29
  Material Federal Income Tax
     Consequences..................   29
</TABLE>
 
<TABLE>
<CAPTION>
                                     PAGE
                                     ----
<S>                                  <C>
  Accounting Treatment.............   32
  Consents and Regulatory
     Approvals.....................   32
  Vanguard Debentures..............   33
  Listing of the AT&T Shares on the
     NYSE..........................   33
  Resale of AT&T Shares Issued in
     the Merger; Vanguard
     Affiliates....................   33
  Interests of Certain Persons in
     the Merger....................   34
  Other............................   36
RIGHTS OF DISSENTING VANGUARD
  SHAREHOLDERS.....................   39
THE MERGER AGREEMENT...............   42
  General..........................   42
  Conversion of Vanguard Shares....   42
  Representations and Warranties...   47
  Business of Vanguard Pending the
     Merger........................   49
  Reasonable Efforts...............   49
  No Solicitation..................   50
  Special Meeting;
     Recommendation................   51
  Conditions; Waivers..............   51
  Termination......................   54
  Termination Fees.................   55
  Expenses.........................   57
  Amendment........................   57
  Extension; Waiver................   57
  Indemnification..................   57
  Employee Benefits................   57
OTHER AGREEMENTS...................   58
  Option Agreement.................   58
  Voting Agreements................   59
SECURITY OWNERSHIP OF CERTAIN
  BENEFICIAL OWNERS................   61
SECURITY OWNERSHIP OF MANAGEMENT...   62
COMPARATIVE RIGHTS OF VANGUARD
  SHAREHOLDERS AND AT&T
  SHAREHOLDERS.....................   64
</TABLE>
 
                                        i
<PAGE>   5
 
<TABLE>
<CAPTION>
                                     PAGE
                                     ----
<S>                                  <C>
  Business Combinations............   64
  State Takeover Legislation.......   64
  Rights of Dissenting
     Shareholders..................   65
  Amendments to Charters...........   66
  Amendments to Bylaws.............   66
  No Preemptive Rights.............   67
  Redemption of Capital Stock......   67
  Dividend Sources.................   68
  Duration of Proxies..............   68
  Shareholder Action...............   68
  Shareholder Proposals............   69
  Meetings of Shareholders.........   69
  Cumulative Voting................   69
  Number and Election of
     Directors.....................   70
  Removal of Directors.............   70
  Vacancies........................   71
  Indemnification of Directors and
     Officers......................   71
  Limitation of Personal Liability
     of Directors..................   73
LEGAL OPINIONS.....................   74
</TABLE>
 
<TABLE>
<CAPTION>
                                     PAGE
                                     ----
<S>                                  <C>
EXPERTS............................   74
SHAREHOLDER PROPOSALS FOR THE 1999
  VANGUARD ANNUAL MEETING..........   75
WHERE YOU CAN FIND MORE
  INFORMATION......................   76
LIST OF DEFINED TERMS..............   78
</TABLE>
 
                                   APPENDICES
 
<TABLE>
<S>                                   <C>
APPENDIX A -- Amended and Restated
  Agreement and Plan of Merger,
  dated as of October 2, 1998, among
  AT&T, Merger Sub and Vanguard.....  A-1
APPENDIX B -- Option Agreement,
  dated as of October 2, 1998,
  between AT&T and Vanguard.........  B-1
APPENDIX C -- Opinion of Wasserstein
  Perella & Co., Inc................  C-1
APPENDIX D -- Article 13 of the
  North Carolina Business
  Corporation Act...................  D-1
</TABLE>
 
                                       ii
<PAGE>   6
 
                     QUESTIONS AND ANSWERS ABOUT THE MERGER
 
Q.  WHAT IS THE PROPOSED TRANSACTION?
 
A.  AT&T will acquire Vanguard by merging Vanguard into a subsidiary of AT&T.
 
Q.  WHAT WILL I RECEIVE IN THE MERGER?
 
A.  It depends. For each Vanguard share you own, you may request to receive in
    the merger either: (1) 0.59805 shares of AT&T common stock OR (2) $23.00 in
    cash. Our ability to grant your request will be determined by how many
    shareholders request AT&T shares versus how many request cash. We must
    ensure that 50% of the outstanding non-dissenting Vanguard shares are
    exchanged for AT&T shares and the remaining 50% are exchanged for cash. If
    we are unable to grant your request, you will receive a mixture of AT&T
    shares and cash for your Vanguard shares. The 0.59805 exchange ratio has
    been adjusted to reflect the previously announced three-for-two stock split
    of AT&T common stock which will be paid on April 15, 1999.
 
    After giving effect to the merger, the former holders of Vanguard shares
    that are converted into AT&T shares will hold less than 1% of the
    outstanding AT&T shares.
 
Q.  CAN THE VALUE OF THE TRANSACTION CHANGE BETWEEN NOW AND THE TIME THE MERGER
    IS COMPLETED?
 
A.  Yes. The value of the AT&T share portion of the consideration can change,
    although the $23.00 per share cash portion will not change. The 0.59805
    exchange ratio is a fixed exchange ratio, which means that it will not
    change even if the trading price of an AT&T share changes. Therefore, the
    market value of the total transaction, and of the AT&T shares you may
    receive in the merger, will increase or decrease as the price of AT&T shares
    increases or decreases.

Q.  WHAT ARE MY TAX CONSEQUENCES AS A RESULT OF THE MERGER?
 
A.  Your tax consequences will depend upon what form of payment you receive in
    the merger as well as your basis in your Vanguard shares. For more detail,
    see page 29 of this proxy statement/ prospectus.
 
Q.  HOW DO I VOTE?
 
A.  You vote by indicating on the enclosed white proxy card how you want to
    vote, and signing and mailing the white proxy card in the enclosed prepaid
    white return envelope. Please vote as soon as possible to ensure that your
    shares are represented at the special meeting.
 
Q.  WHAT VOTE IS REQUIRED TO APPROVE THE MERGER?
 
A.  Holders of a majority of the outstanding Vanguard shares must approve the
    merger under North Carolina law and under the merger agreement. Therefore,
    it is important that you return your signed proxy card.
 
Q.  IF MY SHARES ARE HELD IN "STREET NAME" BY MY BROKER, WILL MY BROKER VOTE MY
    SHARES FOR ME?
 
A.  It depends. Your broker will vote your shares for you only if you provide
    instructions to your broker on how to vote. You should follow the directions
    provided by your broker regarding how to instruct your broker to vote your
    shares. Without instructions, your shares will not be voted on the merger
    agreement and the merger, which will have the same effect as voting against
    the merger agreement and the merger.
 
Q.  CAN I CHANGE MY VOTE AFTER I HAVE MAILED IN MY SIGNED PROXY?
 
A.  Yes. You can change your vote at any time before we vote your proxy at the
    Vanguard special meeting in one of three ways. First, you can send a written
    notice stating that you would like to
 
                                        1
<PAGE>   7
    revoke your proxy to the Secretary of Vanguard at the address below. Second,
    you can complete a new proxy card and send it to the Secretary of Vanguard,
    and the new proxy card will automatically replace any earlier proxy card you
    returned. Third, you can attend, and vote in person at, the special meeting.
    You should send any written notice or new proxy card to the Secretary of
    Vanguard, at the following address: Richard C. Rowlenson, Vanguard Cellular
    Systems, Inc., 2002 Pisgah Church Road, Suite 300, Greensboro, North
    Carolina 27455-3314, Tel: (336) 545-2223.
 
Q.  DO I HAVE THE RIGHT TO DISSENT?
 
A.  Yes. However, you must follow certain procedures strictly in order to do so.
    For a description of these procedures, see page 39 and Appendix D of this
    proxy statement/prospectus.
 
Q.  HOW DO I ELECT THE FORM OF PAYMENT THAT I PREFER?
 
A.  To elect the form of payment you prefer, you must complete a green letter of
    transmittal and election form, with instructions for making an election as
    to your preference between receiving AT&T shares or cash in the merger. You
    cannot elect to receive both cash and AT&T shares in the merger. A green
    election form, together with a green return envelope, is being mailed to you
    at the same time as the mailing of this proxy statement/prospectus. The
    fully completed green election form, together with your certificates
    representing outstanding Vanguard shares, must be returned to Boston
    Equiserve Trust Company, N.A. before the election deadline on April 26,
    1999. If we do not expect to complete the merger within three to five
    business days after the special meeting, we will extend the election
    deadline and publicly announce the extension.
 
Q.  WHAT HAPPENS IF I DON'T MAKE AN ELECTION FOR CASH OR SHARES?

A.  If you fail to make an election prior to the election deadline, you will not
    be entitled to elect from among the alternative forms of payment and will
    receive cash if there is an oversubscription for AT&T shares, AT&T shares if
    there is an oversubscription for cash, or both cash and AT&T shares if there
    is no oversubscription. For example, if you do not make an election and the
    value of a pre-split AT&T share is $83.00, and stock elections are made for
    75% of the outstanding Vanguard shares, assuming there are no dissenting
    shares, you and any other Vanguard shareholders who did not make a stock
    election will receive $23.00 in cash for each Vanguard share and each of the
    Vanguard shareholders that elected to receive AT&T shares will receive a
    combination of AT&T shares and cash having an aggregate value at such time
    of approximately $29.73 per Vanguard share. For more detail, see page 43 of
    this proxy statement/prospectus.
 
Q.  WHEN DO YOU HOPE TO COMPLETE THE MERGER?
 
A.  We hope to complete the merger in the second quarter of 1999.
 
Q.  WILL MY RIGHTS AS A SHAREHOLDER CHANGE AS A RESULT OF THE MERGER?
 
A.  Yes. Currently, Vanguard shareholder rights are governed by North Carolina
    law and Vanguard's articles of incorporation and bylaws, whereas AT&T
    shareholder rights are governed by New York law and AT&T's charter and by-
    laws. After the merger, Vanguard shareholders who receive AT&T shares in the
    merger will become shareholders of AT&T and, therefore, their rights will be
    governed by New York law and AT&T's charter and by-laws. For a summary of
    material differences between the rights of Vanguard shareholders and the
    rights of AT&T shareholders, see page 64 of this proxy statement/
    prospectus.
 
                                        2
<PAGE>   8
 
Q.  WHOM SHOULD I CALL WITH QUESTIONS OR TO OBTAIN ADDITIONAL COPIES OF THE
    PROXY STATEMENT/PROSPECTUS?
 
A.  You should call D.F. King & Co. at (800) 735-3568.
 
Q.  WHERE CAN I FIND MORE INFORMATION ABOUT AT&T AND VANGUARD?
 
A.  You can find more information about AT&T and Vanguard from various sources
    described under "Where You Can Find More Information" on page 76 of this
    proxy statement/ prospectus.
 
                      WHAT YOU WILL RECEIVE IN THE MERGER
 
     The following chart illustrates the approximate value of what a holder of
100 Vanguard shares will receive in the merger assuming varying values for AT&T
shares and different percentages of cash and AT&T shares. You should bear in
mind that the value of AT&T shares is subject to fluctuation. This chart does
not adjust the value of an AT&T share or the exchange ratio to reflect the
three-for-two split of AT&T shares which will be paid on April 15, 1999, and
uses hypothetical pre-split AT&T share prices.
 
<TABLE>
<CAPTION>
                                            IF THE VALUE OF A PRE-SPLIT
                                                  AT&T SHARE IS:
                                           $78.00     $83.00     $88.00
                                           -------    -------    -------
<S>                                        <C>        <C>        <C>
and you receive:
   100% cash                               $2,300     $2,300     $2,300
   75% cash/25% AT&T shares                $2,502     $2,552     $2,602
   50% cash/50% AT&T shares                $2,705     $2,805     $2,904
   25% cash/75% AT&T shares                $2,907     $3,057     $3,206
   100% AT&T shares                        $3,110     $3,309     $3,509
</TABLE>
 
     To find out the current price of an AT&T share, please call (800) 735-3568.
 
                                        3
<PAGE>   9
 
                                    SUMMARY
 
     This summary highlights selected information from this document and may not
contain all of the information that is important to you. To understand the
merger fully and for a more complete description of the legal terms of the
merger, you should read carefully this entire document and the documents to
which we have referred you. See "Where You Can Find More Information" on page 76
of this proxy statement/prospectus. Each item in this summary includes a page
reference directing you to a more complete description of that item.
 
                                 THE COMPANIES
 
AT&T CORP. (SEE PAGE 15)
32 Avenue of the Americas
New York, New York 10013-2412
Tel: (212) 387-5400
 
     AT&T is among the world's communications leaders, providing voice, data and
video telecommunications services to large and small businesses, consumers and
government entities. AT&T and its subsidiaries furnish regional, domestic,
international and local communication transmission services, including cellular
telephone and other wireless services. Internet users can obtain information
about AT&T and its services at http://www.att.com.
 
     On March 9, 1999, AT&T acquired Tele-Communications, Inc. TCI is a provider
of cable television services in the United States. The TCI transaction is
described briefly on page 15 of this proxy statement/ prospectus, and in more
detail in the proxy statement/prospectus of AT&T and TCI that was filed with the
Securities and Exchange Commission on January 8, 1999, which is incorporated by
reference into this proxy statement/prospectus.
 
     On March 17, 1999, AT&T declared a three-for-two stock split of its common
shares. The record date for AT&T stockholders eligible to receive the stock
split is March 31, 1999, and the payment date for the stock split is April 15,
1999. Pursuant to the merger agreement, the exchange ratio for the stock portion
of the payment to be made to Vanguard shareholders in the merger will be
adjusted to reflect the stock split from 0.3987 shares of AT&T common stock per
Vanguard share to 0.59805 shares of AT&T common stock per Vanguard share.
Because the merger is expected to be completed after the stock split, we refer
in this proxy statement/prospectus to the post-split exchange ratio of 0.59805
shares of AT&T common stock per Vanguard share.
 
VANGUARD CELLULAR SYSTEMS, INC.
(SEE PAGE 16)
2002 Pisgah Church Road, Suite 300
Greensboro, North Carolina 27455-3314
Tel: (336) 282-3690
 
     Vanguard is one of the largest independent operators of cellular telephone
systems in the United States and provides service under the Cellular One(R)
brand name. Vanguard's operations are focused primarily in the northeastern
quarter of the United States. Vanguard provides analog and digital wireless
telephone and data, paging, long-distance and Internet services to more than
664,000 customers. Internet users can obtain information about Vanguard and its
services at http://www.vcela.com.
 
                       THE SPECIAL MEETING (SEE PAGE 17)
 
     The special meeting of Vanguard shareholders will be held at the offices of
Vanguard, 2002 Pisgah Church Road, Suite 300, Greensboro, North Carolina
27455-3314 on April 27, 1999, at 9:00 a.m. local time.
 
     At the special meeting, you will be asked to consider and vote upon a
proposal to approve the merger agreement and the merger. Approval of the merger
agreement and the merger requires the affirmative vote of a majority of the
outstanding Vanguard shares.
 
     Only holders of Vanguard shares who are holders at the close of business on
the record date, March 22, 1999, will be entitled to notice of and to vote at
the special meeting. As of March 22, 1999, directors and executive officers of
Vanguard and their
 
                                        4
<PAGE>   10
 
affiliates beneficially owned approximately 21.65% of the outstanding Vanguard
shares.
 
     Each Vanguard share carries one vote. As of March 22, 1999, 40,177,375
votes were eligible to be cast at the special meeting.
 
     No vote of AT&T shareholders is required to approve the merger.
 
                      THE MERGER AND THE MERGER AGREEMENT
 
     The merger agreement is the legal document that governs the merger. The
merger agreement is attached as Appendix A to this proxy statement/prospectus,
and we encourage you to read it carefully.
 
REASONS FOR THE MERGER (SEE PAGE 22)
 
     The Vanguard Board of Directors considered a number of factors in
evaluating the merger agreement and the merger. After consideration of all the
factors taken as a whole, the Vanguard Board of Directors determined that the
merger agreement and the merger are fair to, and in the best interests of,
Vanguard and its shareholders.
 
RECOMMENDATION TO SHAREHOLDERS (SEE PAGE 22)
 
     The Vanguard Board of Directors has unanimously adopted and approved the
merger agreement and the merger and recommends that you vote for approval and
adoption of the merger agreement and the merger at the special meeting.
 
FAIRNESS OPINION (SEE PAGE 23)
 
     Vanguard's financial advisor, Wasserstein Perella & Co., Inc., has given a
written opinion to Vanguard's Board of Directors that, as of October 2, 1998,
the payment to be received by Vanguard shareholders under the merger agreement
is fair to Vanguard shareholders from a financial point of view. A copy of this
opinion is attached as Appendix C to this proxy statement/prospectus. You should
read this opinion in its entirety to fully understand it.
 
MATERIAL FEDERAL INCOME TAX CONSEQUENCES (SEE PAGE 29)
 
     The U.S. federal income tax consequences to you of the merger will depend
on the form of consideration you receive in the merger. Under current law, if
you receive solely AT&T shares for your Vanguard shares, you will not recognize
any gain or loss for U.S. federal income tax purposes. If you receive part cash
and part AT&T shares, and your adjusted basis in your Vanguard shares is less
than the fair market value, as of the date of the merger, of the AT&T shares and
cash you receive, you will recognize a gain. This recognized gain will equal the
lesser of (1) the excess, if any, as of the date of the merger, of the fair
market value of the AT&T shares and cash received by you over the adjusted basis
of your Vanguard shares and (2) the amount of cash you receive. However, in the
event you realize a loss because your adjusted basis in your Vanguard shares is
greater than the fair market value of the AT&T shares and cash you receive, such
loss would not be currently allowed. If you receive solely cash, gain or loss
will generally be recognized by you to the extent of the difference between the
amount of cash received by you and your adjusted basis in your Vanguard shares,
and such gain or loss will generally be a capital gain or loss to you.
 
     Because of the complexity of the tax laws and the individual nature of the
tax consequences of the merger, we recommend that you consult a tax advisor
concerning the applicable U.S. federal, state and local income tax consequences
of the merger.
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER (SEE PAGE 34)
 
     Certain members of Vanguard management and of the Vanguard Board of
Directors have interests in the merger that are different from, or in addition
to, the interests of the other Vanguard shareholders. The Vanguard Board of
Directors was aware of such interests and considered them, among other matters,
in adopting and approving the merger agreement and the merger.
 
                                        5
<PAGE>   11
 
ACCOUNTING TREATMENT (SEE PAGE 32)
 
     The merger will be treated as a "purchase" and, therefore, the purchase
price will be allocated to the assets and liabilities of Vanguard based on their
estimated fair market values at the date of acquisition.
 
CONSENTS AND REGULATORY APPROVALS (SEE PAGE 32)
 
     In order to complete the merger, Vanguard and AT&T must receive
authorizations from and/or make certain filings with various U.S. federal and
state governmental agencies and must obtain certain consents from other persons
or entities.
 
CONDITIONS TO THE MERGER (SEE PAGE 51)
 
     Completion of the merger depends upon a number of conditions being
satisfied, or waived by the party benefitted by the condition waived. The
conditions to the merger include, among others, the following:
 
     - approval of the merger agreement and the merger by Vanguard shareholders;
 
     - obtaining the final approval of the Federal Communications Commission on
       terms acceptable to AT&T;
 
     - obtaining other regulatory approvals other than those that, if not
       obtained, could not reasonably be expected to have a material adverse
       effect on Vanguard or AT&T, on terms acceptable to AT&T;
 
     - obtaining, on certain terms, contractual consents that, if not obtained,
       could reasonably be expected to have a material adverse effect on
       Vanguard;
 
     - dissenters' rights not being asserted for more than 5% of the Vanguard
       shares;
 
     - the absence of any event, development or change of circumstance which
       could reasonably be expected to have a material adverse effect on
       Vanguard; and
 
     - receipt by AT&T of an opinion from Wachtell, Lipton, Rosen & Katz and
       receipt by Vanguard of an opinion from Latham & Watkins stating that the
       merger will be treated for U.S. federal income tax purposes as a
       "reorganization" within the meaning of Section 368(a) of the Internal
       Revenue Code of 1986. This condition may not be waived. If the merger
       qualifies as a "reorganization," then the merger will be tax-free to
       Vanguard, and Vanguard shareholders will generally be taxable on an
       amount equal to the lesser of the gain in their Vanguard shares on the
       date of the merger and the amount of cash they receive in the merger. The
       consequences of the merger qualifying as a "reorganization" are discussed
       in more detail under "Material Federal Income Tax Consequences" on page
       29.
 
     The merger will occur as soon as practicable after Vanguard and AT&T
satisfy all of the conditions in the merger agreement. However, even if the
conditions are satisfied, the closing of the merger may be delayed (1) by AT&T
until not later than 12 or, under certain circumstances, 18 months from the date
of the merger agreement if, in its good faith judgment, AT&T believes such delay
is necessary in connection with avoiding interference with a material
transaction or (2) by the agreement of AT&T and Vanguard.
 
TERMINATION (SEE PAGE 54)
 
     The merger agreement may be terminated, and the merger abandoned, only in a
limited number of circumstances, including, among others, the following:
 
     - if the merger is not completed by October 1, 1999, or April 1, 2000 if
       certain conditions to the merger have been or are capable of being
       satisfied at that time;
 
     - if the merger agreement or the merger is not approved by Vanguard
       shareholders;
 
     - by AT&T, if the Vanguard Board of Directors withdraws or adversely
       modifies its recommendation of the merger
 
                                        6
<PAGE>   12
 
       to Vanguard shareholders or Vanguard furnishes information or engages in
       negotiations or discussions in connection with an alternate acquisition
       proposal; and
 
     - if AT&T and Vanguard agree to terminate the merger agreement.
 
     The merger agreement provides for the payment of termination fees in
certain cases. For example, if the merger agreement is terminated under certain
circumstances involving an alternative acquisition proposal for Vanguard,
Vanguard must pay AT&T a termination fee of $52.5 million plus expenses.
 
OTHER AGREEMENTS (SEE PAGE 58)
 
     In connection with the merger agreement, AT&T and Vanguard entered into an
option agreement, dated as of October 2, 1998. In the option agreement, Vanguard
granted AT&T an option to purchase up to 19.9% of the issued and outstanding
Vanguard shares, at an exercise price of $23.00 per share.
 
     Also in connection with the merger agreement, AT&T entered into separate
voting agreements with Haynes G. Griffin, Stephen R. Leeolou, L. Richardson
Preyer, Jr., Stuart S. Richardson, Piedmont Harbor-Piedmont Associates Limited
Partnership, the Smith Richardson Foundation, Inc. and certain related trusts
and foundations. In these agreements, these shareholders granted AT&T an option
to purchase all of their Vanguard shares which, as of the record date, was an
aggregate of 6,678,889 Vanguard shares or approximately 16.62% of the
outstanding Vanguard shares, at an exercise price, generally, of $23.00 per
share. Vanguard shares acquired after October 2, 1998 by any person or entity
who executed a voting agreement are also covered by the voting agreement. AT&T
consented to the transfer of 784,782 of these Vanguard shares to certain
charitable trusts and family foundations, and entered into voting agreements
with these trusts and foundations.
 
     Except in certain limited circumstances, AT&T may not exercise any of these
options until the merger agreement is terminated.
 
     Each person or entity who executed a voting agreement agreed to vote its
Vanguard shares in favor of approval of the merger agreement and the merger and
against any other acquisition proposal.
 
     Certain Vanguard executives who may borrow from Vanguard to finance the
exercise of stock options will also agree in connection with such borrowing (1)
to vote Vanguard shares acquired with the proceeds of the borrowing in favor of
the merger and (2) not to sell or transfer any of these shares prior to March
31, 1999.
 
                                        7
<PAGE>   13
 
COMPARATIVE PER SHARE MARKET PRICE AND DIVIDEND INFORMATION
 
     AT&T shares are listed and primarily traded on the New York Stock Exchange
under the symbol "T." Vanguard shares trade on the Nasdaq National Market tier
of the Nasdaq Stock Market under the symbol "VCELA."
 
     The following table sets forth the high and low sale prices for an AT&T
share and for a Vanguard share, rounded up to the nearest sixteenth, and, in the
case of AT&T shares, the dividends declared, for the periods indicated. Vanguard
has never paid any cash dividends to its shareholders. The prices are, in the
case of AT&T shares, as reported on the NYSE Composite Transaction Tape and, in
the case of Vanguard shares, as reported on the NASDAQ/NM, in each case based on
published financial sources.
 
     The AT&T share price has not been adjusted to reflect (1) the spin-off
stock dividend of .324084 shares of Lucent Technologies, Inc. for each AT&T
share in the third quarter of 1996, (2) the spin-off stock dividend of .0625
shares of NCR Corporation for each AT&T share in the fourth quarter of 1996 or
(3) the AT&T three-for-two stock split which will be paid on April 15, 1999.
 
<TABLE>
<CAPTION>
                                                                                             VANGUARD
                                                            AT&T SHARES                       SHARES
                                                  --------------------------------       ----------------
                                                                           CASH
                                                                         DIVIDENDS
                                                                            PER
                                                  HIGH       LOW           SHARE         HIGH         LOW
                                                  ----       ---         ---------       ----         ---
<S>                                               <C>        <C>         <C>             <C>          <C>
1996
  First Quarter.................................  $68 7/8    $60 1/8       $0.33         $23 1/2      $18
  Second Quarter................................   64 7/8    58             0.33          24 5/8       20
  Third Quarter.................................   62 3/8    49 1/4         0.33          23 3/4       17 1/2
  Fourth Quarter................................   44 1/2    33 1/4         0.33          19 3/8       14 1/4
1997
  First Quarter.................................   42 5/8    34 1/8         0.33          16 1/4       10 7/8
  Second Quarter................................   38 1/2    30 3/4         0.33          14 1/2        9 1/4
  Third Quarter.................................   46 1/8    34             0.33          16           13 3/8
  Fourth Quarter................................   64        43             0.33          16 15/16     11 5/8
1998
  First Quarter.................................   68 1/2    57 3/8         0.33          20 3/16      11 5/8
  Second Quarter................................   67 3/8    56 1/8         0.33          20           16 1/2
  Third Quarter.................................   61 3/8    48 3/8         0.33          25 1/4       17 7/8
  Fourth Quarter................................   79        56 3/16        0.33          26 5/8       18 11/16
1999
  First Quarter (through March 25, 1999)........   96 1/8    75 7/8         0.33          32           25 3/4
</TABLE>
 
     On October 2, 1998, the last full trading day before the public
announcement of the proposed merger, the last reported closing price on the NYSE
Composite Transaction Tape for AT&T shares was $58.63 per share, and the last
reported sale price on the NASDAQ/NM for Vanguard shares was $19.88 per share.
On March 25, 1999, the most recent available date prior to the printing of this
proxy statement/prospectus, the last reported closing price on the NYSE
Composite Transaction Tape for AT&T shares was $81.88 per share, and the last
reported sale price on the NASDAQ/NM for Vanguard shares was $27.50 per share.
                                        8
<PAGE>   14
 
SELECTED HISTORICAL FINANCIAL INFORMATION
 
AT&T
 
     In the table below, we provide you with selected historical consolidated
financial data of AT&T. AT&T prepared this information using its consolidated
financial statements as of the dates indicated and for each of the fiscal years
in the five-year period ended December 31, 1998. AT&T derived the consolidated
income statement data below for each of the three years ended December 31, 1998,
and the consolidated balance sheet data at December 31, 1998 and 1997 from
financial statements audited by PricewaterhouseCoopers LLP, independent
accountants. AT&T derived the remaining data from unaudited consolidated
financial statements, which are not included here. This information is only a
summary and you should read it together with financial information incorporated
by reference to this proxy statement/prospectus.
 
     Income from continuing operations for 1998 includes $1.0 billion of
nonoperational items, including restructuring and other charges as well as
benefits from gains on sales and the adoption of a new accounting standard. 1995
income from continuing operations includes $2.0 billion of restructuring and
other charges. The number of AT&T common shares outstanding and per share data
have not been adjusted to reflect the AT&T three-for-two stock split which will
be paid on April 15, 1999.
 
               AT&T -- SELECTED HISTORICAL FINANCIAL INFORMATION
                                  (UNAUDITED)
                    (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                  AT OR FOR THE YEAR ENDED DECEMBER 31,
                                                             -----------------------------------------------
                                                              1998      1997      1996      1995      1994
                                                             -------   -------   -------   -------   -------
<S>                                                          <C>       <C>       <C>       <C>       <C>
INCOME STATEMENT DATA:
  Revenues.................................................  $53,223   $51,577   $50,688   $48,449   $46,063
  Operating income.........................................    7,487     6,836     8,709     5,169     7,393
  Income from continuing operations........................    5,235     4,249     5,458     2,981     4,230
  Weighted average common shares and potential common
    shares.................................................    1,800     1,789     1,767     1,741     1,714
  Per common share -- basic:
    Income from continuing operations(1)...................  $  2.93   $  2.39   $  3.10   $  1.72   $  2.48
  Per common share -- diluted:
    Income from continuing operations(2)...................     2.91      2.38      3.09      1.71      2.47
  Cash dividends declared per common share.................     1.32      1.32      1.32      1.32      1.32
BALANCE SHEET DATA:
  Total assets.............................................  $59,550   $61,095   $57,348   $62,864   $57,817
  Long-term debt, including capital leases.................    5,556     7,857     8,878     8,913     9,138
  Shareowners' equity......................................   25,522    23,678    21,092    17,400    18,100
</TABLE>
 
- ---------------
(1) Basic earnings from continuing operations per AT&T common share, adjusted to
    reflect the three-for-two stock split, for the five years ended December 31,
    1998 would be $1.96, $1.59, $2.07, $1.15, and $1.65, respectively.
 
(2) Diluted earnings from continuing operations per AT&T common share, adjusted
    to reflect the three-for-two stock split, for the five years ended December
    31, 1998 would be $1.94, $1.59, $2.07, $1.14, and $1.64, respectively.
                                        9
<PAGE>   15
 
VANGUARD
 
     In the table below, we provide you with selected historical consolidated
financial data of Vanguard. Vanguard prepared this information using the
consolidated financial statements of Vanguard as of the dates indicated and for
each of the fiscal years in the five-year period ended December 31, 1997, and
for the nine-month periods ended September 30, 1998 and 1997. Vanguard derived
the consolidated income statement data below for each of the five years ended
December 31, 1997, and the consolidated balance sheet data at December 31, 1997,
1996, 1995, 1994 and 1993 from financial statements audited by Arthur Andersen
LLP, independent accountants. Vanguard derived the remaining data from unaudited
consolidated financial statements, which are not included here.
 
     When you read this selected historical consolidated financial information,
you should consider reading along with it the historical financial statements
and accompanying notes that Vanguard has included in its Annual Report on Form
10-K for the year ended December 31, 1997 and its Quarterly Report on Form 10-Q
for the quarterly period ended September 30, 1998. You can obtain this report by
following the instructions we provide under "Where You Can Find More
Information" on page 76 of this proxy statement/prospectus.
 
     In 1998, Vanguard recognized net gains of $265.9 million adjusted for
income tax expense of $101.9 million on the dispositions of its cellular systems
in Myrtle Beach, South Carolina and western Florida as well as its interests in
a joint venture providing cellular services in Wilmington/ Jacksonville, North
Carolina. In 1997 and 1996, Vanguard recognized a deferred income tax benefit of
$42.7 million and $5.0 million, respectively. The extraordinary charges for the
nine months ended September 30, 1998 and for the years ended December 31, 1994
and 1993 reflect the write-off of deferred financing costs associated with
Vanguard's credit facilities that were replaced during those periods.
 
             VANGUARD -- SELECTED HISTORICAL FINANCIAL INFORMATION
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                   AT OR FOR THE NINE
                                      MONTHS ENDED
                                      SEPTEMBER 30,             AT OR FOR THE YEAR ENDED DECEMBER 31,
                                   -------------------   ----------------------------------------------------
                                     1998       1997       1997       1996       1995       1994       1993
                                   --------   --------   --------   --------   --------   --------   --------
                                       (UNAUDITED)
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>
INCOME STATEMENT DATA:
  Revenues.......................  $319,380   $275,780   $374,518   $302,054   $236,071   $168,001   $109,064
  Income from operations.........    50,877     42,710     49,264     53,928     31,858     11,866        122
  Income (loss) before
    extraordinary item...........   136,787      1,370    (10,027)     6,499     (7,013)   (13,945)   (15,283)
  Extraordinary charge...........    (3,971)        --         --         --         --     (8,402)    (3,715)
  Net income (loss)..............  $132,816   $  1,370   $(10,027)  $  6,449   $ (7,013)  $(22,347)  $(18,998)
  Net income (loss) per common
    share:
    Basic........................  $   3.57   $   0.03   $  (0.25)  $   0.16   $  (0.17)  $  (0.58)  $  (0.50)
    Diluted......................      3.44       0.03      (0.25)      0.15      (0.17)     (0.58)     (0.50)
  Common shares used in computing
    per share amounts:
    Basic........................    37,232     40,466     40,224     41,320     41,100     38,628     38,038
    Diluted......................    38,634     40,872     40,224     41,898     41,100     38,628     38,038
BALANCE SHEET DATA:
  Total assets...................  $753,339   $806,560   $827,961   $730,581   $596,577   $431,711   $284,429
  Long-term debt.................   532,851    736,963    768,967    629,954    522,143    348,649    238,153
  Shareholders' equity...........   137,782     15,270        910     33,451     29,048     39,027     21,898
</TABLE>
 
                                       10
<PAGE>   16
 
SELECTED PRO FORMA CONDENSED FINANCIAL INFORMATION
 
     In the table below, we provide you with unaudited selected pro forma
condensed financial information for AT&T as if the merger with TCI had been
completed on January 1, 1997 for income statement purposes and on December 31,
1998 for balance sheet purposes. Because AT&T does not have a "controlling
financial interest" in the Liberty Media Group, which was previously
consolidated in TCI's results, the Liberty Media Group has been reflected as an
equity method investment in the pro forma financial statements. See also
"-- Selected Historical Financial Information" on page 9 of this proxy
statement/prospectus.
 
     This unaudited selected pro forma condensed financial information should be
read in conjunction with the separate historical financial statements and
accompanying notes of AT&T and of TCI, which are incorporated by reference in
this proxy statement/prospectus. It is also important that you read the
unaudited pro forma condensed financial information and accompanying discussion
and notes that are included in the Current Report of AT&T on Form 8-K filed
March 22, 1999, the proxy statement/prospectus of AT&T and TCI and AT&T's 1998
Annual Report on Form 10-K incorporated herein by reference. See "Where You Can
Find More Information" on page 76 of this proxy statement/prospectus. You should
not rely on the unaudited selected pro forma financial information as an
indication of the results of operations or financial position that would have
been achieved if the transaction with TCI had taken place earlier or of the
results of operations or financial position of AT&T after the completion of such
transactions.
 
     Income from continuing operations available to AT&T common shareowners
excludes the results of the Liberty Media Group and dividend requirements on
preferred stock. The number of AT&T common shares outstanding and per share data
have not been adjusted to reflect the three-for-two stock split which will be
paid on April 15, 1999.
 
     The pro forma financial statements included herein do not show any
adjustments to reflect the merger of Vanguard with and into a subsidiary of
AT&T, as the merger would not have a material effect on the earnings per share
or the financial condition of AT&T.
 
<TABLE>
<CAPTION>
                                                                  (IN MILLIONS, EXCEPT PER SHARE DATA)
                                                                                 NINE MONTHS
                                                               YEAR ENDED           ENDED        YEAR ENDED
                                                              DECEMBER 31,      SEPTEMBER 30,   DECEMBER 31,
                                                                  1998              1998            1997
                                                            -----------------   -------------   ------------
<S>                                                         <C>                 <C>             <C>
UNAUDITED PRO FORMA CONDENSED INCOME STATEMENT DATA:
  Revenues................................................       $59,426           $44,375        $58,156
  Operating income........................................         7,101             4,263          7,196
  Income from continuing operations available to AT&T
    common shareowners....................................       $ 3,764             2,603          3,052
  Weighted average shares and potential shares of AT&T
    common stock..........................................         2,174             2,215          2,189
  Basic earnings per AT&T common share -- Income from
    continuing operations(1)..............................       $  1.80              1.22           1.44
  Diluted earnings per AT&T common share -- Income from
    continuing operations(1)..............................       $  1.74              1.18           1.40
</TABLE>
 
<TABLE>
<CAPTION>
                                                            DECEMBER 31, 1998
                                                            ------------------
<S>                                                         <C>                  <C>             <C>
UNAUDITED PRO FORMA CONDENSED BALANCE SHEET DATA:
  Total assets............................................       $138,098
  Long-term debt, including capital leases................         24,870
  Shareowners' equity -- AT&T.............................         44,514
  Shareowners' equity -- Liberty Media Group..............         23,351
</TABLE>
 
- ------------------------
(1) Pro forma basic and diluted earnings from continuing operations per AT&T
    common share, adjusted to reflect the three-for-two stock split, would be
    $1.20 and $1.16 for the year ended December 31, 1998, $0.96 and $0.93 for
    the year ended December 31, 1997 and $0.81 and $0.79 for the nine months
    ended September 30, 1998, respectively.
                                       11
<PAGE>   17
 
UNAUDITED COMPARATIVE PER SHARE DATA
 
     In the table below, we provide you with historical and pro forma per share
information (with respect to AT&T) as of and for the nine months ended September
30, 1998 and as of and for each of the years ended December 31, 1998 and
December 31, 1997 and the historical and pro forma equivalent per share
information (with respect to Vanguard) as of and for the nine months ended
September 30, 1998 and as of and for the year ended December 31, 1997. The
number of AT&T common shares outstanding used to calculate the AT&T per share
data has not been adjusted to reflect the AT&T three-for-two stock split which
will be paid on April 15, 1999.
 
     The AT&T pro forma per share financial information is presented as if the
transaction with TCI had been completed on January 1, 1997 for income statement
purposes and on December 31, 1997 for balance sheet purposes. The Vanguard pro
forma equivalent information presents AT&T per share data on a pro forma,
pre-split basis multiplied by the unadjusted, pre-split exchange ratio of
0.3987.
 
     It is important that when you read this information, you read along with it
the financial statements and accompanying notes of AT&T, TCI and Vanguard
included in the documents that are described on page 76 of this proxy
statement/prospectus under "Where You Can Find More Information" and are
incorporated herein by reference. It is also important that you read the
unaudited pro forma condensed financial information and accompanying discussion
and notes that are included in the Current Report of AT&T on Form 8-K filed
March 22, 1999 and the proxy statement/prospectus of AT&T and TCI incorporated
herein by reference. See "Where You Can Find More Information" on page 76 of
this proxy statement/prospectus. You should not rely on the unaudited selected
pro forma financial information as an indication of the results of operations or
financial position that would have been achieved if the transaction with TCI had
taken place earlier or of the results of operations or financial position of
AT&T after the completion of such transactions.
 
     The pro forma financial statements included herein do not show any
adjustments to reflect the merger of Vanguard with and into a subsidiary of
AT&T, as the merger would not have a material effect on the earnings per share
or financial condition of AT&T. The per share data presented below for AT&T pro
forma amounts is calculated based on shares of AT&T common stock, not including
shares of Liberty Media Group tracking stock.
 
<TABLE>
<CAPTION>
                                                                                                  VANGUARD
                                                                                         AT&T       PRO
                                                               VANGUARD       AT&T       PRO       FORMA
                                                              HISTORICAL   HISTORICAL   FORMA    EQUIVALENT
                                                              ----------   ----------   ------   ----------
<S>                                                           <C>          <C>          <C>      <C>
Book value per common share:
  December 31, 1998.........................................       N/A       $14.55     $21.20     $8.45
  September 30, 1998........................................    $ 3.75        13.72      21.60      8.61
  December 31, 1997.........................................      0.02        13.24      20.18      8.05
Income from continuing operations:
Earnings (loss) per common share -- basic:
  For the year ended December 31, 1998......................       N/A       $ 2.93     $ 1.80     $0.72
  For the nine months ended September 30, 1998..............    $ 3.57         1.76       1.17      0.47
  For the year ended December 31, 1997......................     (0.25)        2.39       1.44      0.57
Income from continuing operations:
Earnings (loss) per common share -- diluted:
  For the year ended December 31, 1998......................       N/A       $ 2.91     $ 1.74     $0.69
  For the nine months ended September 30, 1998..............    $ 3.44         1.74       1.14      0.45
  For the year ended December 31, 1997......................     (0.25)        2.38       1.40      0.56
</TABLE>
 
                                       12
<PAGE>   18
 
                         CAUTIONARY STATEMENT REGARDING
                           FORWARD-LOOKING STATEMENTS
 
     This Proxy Statement/Prospectus contains certain forward-looking statements
within the meaning of the Private Securities Litigation Reform Act of 1995 with
respect to the financial condition, results of operations, cash flows,
dividends, financing plans, business strategies, operating efficiencies or
synergies, budgets, capital and other expenditures, competitive positions,
growth opportunities for existing products, benefits from new technology, plans
and objectives of management, markets for stock of AT&T and Vanguard and other
matters. Statements in this document that are not historical facts are hereby
identified as "forward-looking statements" for the purpose of the safe harbor
provided by Section 21E of the Exchange Act and Section 27A of the Securities
Act. Such forward-looking statements, including, without limitation, those
relating to the future business prospects, revenues, working capital, liquidity,
capital needs, interest costs and income, in each case relating to AT&T and
Vanguard, wherever they occur in this Proxy Statement/ Prospectus, are
necessarily estimates reflecting the best judgment of the senior management of
AT&T and Vanguard and involve a number of risks and uncertainties that could
cause actual results to differ materially from those suggested by the
forward-looking statements. Such forward-looking statements should, therefore,
be considered in light of various important factors, including those set forth
in this Proxy Statement/Prospectus. Important factors that could cause actual
results to differ materially from estimates or projections contained in the
forward-looking statements include without limitation:
 
     - the effects of vigorous competition in the markets in which these
       entities operate;
 
     - the ability to enter into agreements to, and the cost of entering new
       markets necessary to, provide nationwide services;
 
     - the ability of AT&T to establish a significant market presence in new
       geographic and service markets;
 
     - requirements imposed on these entities or latitude allowed to their
       competitors by the Federal Communications Commission or state regulatory
       commissions under the Telecommunications Act or other applicable laws and
       regulations;
 
     - changes in technology that may increase the number of competitors AT&T or
       Vanguard face or require significant capital expenditures to provide
       competitive services;
 
     - general economic or business conditions that may be less favorable than
       expected, resulting in, among other things, lower than expected revenues;
 
     - costs or difficulties related to the integration of Vanguard's business
       with that of AT&T may be greater than expected;
 
     - costs or difficulties related to the integration of the businesses of
       other entities acquired by AT&T, including the business of
       Tele-Communications, Inc., with that of AT&T may be greater than
       expected;
 
     - legislative or regulatory changes may adversely affect the businesses in
       which AT&T and Vanguard are engaged;
 
     - the rate of customer bankruptcies and other defaults may increase;
 
     - necessary technological changes (including changes to address "Year 2000"
       data systems issues) may be more difficult or expensive to make than
       anticipated; and
 
     - adverse changes may occur in the securities markets.
 
                                       13
<PAGE>   19
 
     The words "estimate," "project," "intend," "expect," "believe" and similar
expressions are intended to identify forward-looking statements. These
forward-looking statements are found at various places throughout this Proxy
Statement/Prospectus and the other documents incorporated herein by reference,
including, but not limited to, the December 31, 1998 Annual Report on Form 10-K
of AT&T (including any amendments thereto) and the December 31, 1997 Annual
Report on Form 10-K of Vanguard (including any amendments thereto). Readers are
cautioned not to place undue reliance on these forward-looking statements, which
speak only as of the date thereof. Neither AT&T nor Vanguard undertakes any
obligation to publicly release any revisions to these forward-looking statements
to reflect events or circumstances after the date hereof or to reflect the
occurrence of unanticipated events.
 
                                       14
<PAGE>   20
 
                                 THE COMPANIES
 
     For your convenience, we have included on page 78 a list of certain defined
terms used in this Proxy Statement/Prospectus.
 
AT&T
 
     AT&T Corp., a New York corporation, is among the world's communications
leaders, providing voice, data and video telecommunications services to large
and small businesses, consumers and government entities. AT&T and its
subsidiaries furnish regional, domestic, international, local and Internet
communication transmission services, including cellular telephone and other
wireless services. AT&T also provides billing, directory and calling card
services to support its communications business.
 
     On March 9, 1999, AT&T acquired Tele-Communications, Inc. through a merger.
In connection with the TCI transaction, AT&T issued (1) 0.7757 AT&T shares for
each share of TCI Group Series A tracking stock, (2) 0.8533 AT&T shares for each
share of TCI Group Series B tracking stock, (3) one share of newly created
Liberty Media Group Class A or Class B tracking stock for each share of the
corresponding series of Liberty Media Group Series A or Series B tracking stock
and (4) a cash payment in lieu of any fractional AT&T share. In the merger, AT&T
also exchanged AT&T shares or Liberty Media Group common stock for shares of TCI
convertible preferred stock. In total, AT&T issued approximately 439 million
AT&T common shares, approximately 540 million Liberty Media Group Class A
Tracking Shares and approximately 55 million Liberty Media Group Class B
Tracking Shares in the TCI transaction. References to AT&T common shares in this
paragraph are prior to the three-for-two split that will be paid on April 15,
1999.
 
     TCI, through its subsidiaries and affiliates, engages principally in the
construction, acquisition, ownership and operation of cable television systems
and the provision of satellite-delivered video entertainment, information and
home shopping program services to various video distribution media, principally
cable television systems.
 
     Before the acquisition, TCI common stock was divided into three groups,
with each group intended to reflect the separate performance of a specified
group of assets and businesses of TCI: TCI Group tracking stock was intended to
reflect the separate performance of the "TCI Group," which consisted primarily
of TCI's domestic cable and telecommunications businesses; Liberty Media Group
tracking stock was intended to reflect the separate performance of the "Liberty
Media Group," which consisted primarily of TCI's programming assets; and TCI
Ventures Group tracking stock was intended to reflect the separate performance
of the "TCI Ventures Group," which was comprised of TCI's principal
international assets and businesses and substantially all of TCI's non-cable and
non-programming assets.
 
     At the time of the closing of the TCI transaction, AT&T common stock was
divided into two groups, with each group intended to reflect the separate
performance of a specified group of assets and businesses of AT&T: (1) AT&T
common stock, par value $1.00 per share ("AT&T SHARES"), which is intended to
reflect the performance of the "AT&T Common Stock Group," which consists of the
combined AT&T and the TCI Group, and (2) Liberty Media Group tracking stock,
which is intended to reflect the performance of the "Liberty Media Group," which
consists of all of the businesses conducted by the current Liberty Media Group
and the current TCI Ventures Group after giving effect to certain asset
transfers from the TCI Ventures Group to the TCI Group that were negotiated in
connection with the TCI transaction.
 
     For more information regarding the TCI transaction, reference is made to
the Proxy Statement/ Prospectus filed by AT&T with the Securities and Exchange
Commission (Registration No. 333-70279), a copy of which is available upon
request. See "Where You Can Find More Information" and "Summary -- Selected Pro
Forma Condensed Financial Information."
 
     AT&T was incorporated in 1885 under the laws of the State of New York and
has its principal executive offices at 32 Avenue of the Americas, New York, New
York 10013-2412 (telephone
                                       15
<PAGE>   21
 
number 212-387-5400). Internet users can obtain information about AT&T and its
services at http://www.att.com.
 
WINSTON, INC.
 
     Winston, Inc. ("MERGER SUB") is a Delaware corporation formed by AT&T in
September 1998 solely for the purpose of having Vanguard merge into Merger Sub.
Merger Sub is wholly owned by AT&T. The mailing address of Merger Sub's
principal executive offices is c/o AT&T Corp., 32 Avenue of the Americas, New
York, New York 10013-2412 (telephone number 212-387-5400). AT&T plans to change
the name of Merger Sub.
 
VANGUARD
 
     Vanguard Cellular Systems, Inc., a North Carolina corporation, is one of
the largest independent operators of cellular telephone systems in the United
States and provides service under the Cellular One(R) brand name. Vanguard's
operations are focused primarily along the northeastern quarter of the United
States and cover approximately 6.8 million POPs. "POPS" refer to the population
of a market multiplied by a percentage ownership interest in an entity licensed
by the Federal Communications Commission (the "FCC") to construct and operate a
cellular telephone system in such market (and POPs do not represent actual
subscribers in the cellular system). Vanguard provides analog and digital
wireless telephone and data, paging, long-distance and Internet services to more
than 664,000 customers.
 
     Vanguard was incorporated in 1984 under the laws of the State of North
Carolina and has its principal executive offices at 2002 Pisgah Church Road,
Suite 300, Greensboro, North Carolina 27455-3314 (telephone number
336-282-3690). Internet users can obtain information about Vanguard and its
services at http://www.vcela.com.
 
                                       16
<PAGE>   22
 
                              THE SPECIAL MEETING
 
GENERAL
 
     This Proxy Statement/Prospectus is being furnished to Vanguard shareholders
as part of the solicitation of proxies by the Vanguard Board of Directors for
use at a Special Meeting of shareholders of Vanguard, to be held on April 27,
1999 at 9:00 a.m. local time, at the offices of Vanguard, 2002 Pisgah Church
Road, Suite 300, Greensboro, North Carolina 27455-3314. This Proxy
Statement/Prospectus and the enclosed form of proxy are first being mailed to
shareholders of Vanguard on or about March 27, 1999.
 
     At the Special Meeting, the shareholders of Vanguard will be asked to
consider and vote upon: (1) a proposal (the "MERGER PROPOSAL") to approve the
Amended and Restated Agreement and Plan of Merger, dated as of October 2, 1998,
by and among Vanguard, AT&T and Merger Sub, including the plan of merger
contained therein (the "MERGER AGREEMENT"), and to approve the merger of
Vanguard with and into Merger Sub (the "MERGER") contemplated thereby, and (2)
such other business that may properly come before the Special Meeting.
 
     Each copy of this Proxy Statement/Prospectus mailed to holders of shares of
Class A Common Stock, par value $0.01 per share, of Vanguard, is accompanied by
a white form of proxy for use at the Special Meeting. Contemporaneously with the
mailing of this Proxy Statement/Prospectus, in a separate envelope, Vanguard
shareholders are being mailed a green letter of transmittal and form of election
("FORM OF ELECTION") to be used in connection with the exchange of Vanguard
Shares for AT&T Shares and/or cash.
 
     The Vanguard Board unanimously recommends that shareholders vote FOR the
Merger Proposal. Approval of the Merger Proposal by Vanguard shareholders is a
condition to consummation of the Merger.
 
RECORD DATE AND VOTING
 
     Vanguard has fixed the close of business on March 22, 1999 as the record
date for the determination of the Vanguard shareholders entitled to notice of
and to vote at the Special Meeting (the "RECORD DATE"). Accordingly, only
holders of record of Vanguard Shares on the Record Date will be entitled to
notice of and to vote at the Special Meeting. As of the Record Date, there were
outstanding and entitled to vote 40,177,375 Vanguard Shares, which Vanguard
Shares were held by approximately 761 holders of record. Each holder of record
of Vanguard Shares on the Record Date is entitled to one vote per share, which
votes may be cast either in person or by properly executed proxy, at the Special
Meeting. The presence, in person or by properly executed proxy, of the holders
of a majority of the outstanding Vanguard Shares entitled to vote at the Special
Meeting is necessary to constitute a quorum at the Special Meeting.
 
     Approval of the Merger Proposal will require the affirmative vote of the
holders of a majority of the Vanguard Shares outstanding on the Record Date (the
"REQUIRED VANGUARD VOTE").
 
     Vanguard Shares represented in person or by proxy will be counted for the
purposes of determining whether a quorum is present at the Special Meeting.
Broker non-votes will be treated as Vanguard Shares that are present and
entitled to vote at the Special Meeting for purposes of determining whether a
quorum exists and will have the same effect as votes against approval of the
Merger Proposal. Unless contrary instructions are indicated on the proxy, all
Vanguard Shares
 
                                       17
<PAGE>   23
 
represented by valid proxies received pursuant to this solicitation (and not
revoked before they are voted) will be voted FOR the Merger Proposal. With
respect to any other business that may properly come before the Special Meeting
and be submitted to a vote of Vanguard shareholders, proxies received by the
Vanguard Board will be voted in accordance with the judgment of the designated
proxy holders. Under the rules of the NASDAQ/NM, Vanguard Shares held by a
broker or nominee may not be voted on the Merger Proposal without instructions
to do so from the beneficial owners.
 
     Haynes G. Griffin, Stephen R. Leeolou, L. Richardson Preyer, Jr., Stuart S.
Richardson, Piedmont Harbor-Piedmont Associates Limited Partnership, the Smith
Richardson Foundation, Inc. and certain related trusts and foundations owning,
as of the Record Date, in the aggregate approximately 6,678,889 Vanguard Shares
(or approximately 16.62% of the outstanding Vanguard Shares) have each entered
into Voting Agreements (as defined herein) with AT&T pursuant to which these
holders have agreed, among other things, to vote their Vanguard Shares
(including any Vanguard Shares subsequently acquired by such persons) in favor
of the Merger Proposal. In addition, certain executive officers of Vanguard who
may borrow from Vanguard to finance the exercise of certain options to purchase
Vanguard Shares have agreed (or will as a condition to such borrowing be
required to agree) to vote Vanguard Shares acquired thereby in favor of the
Merger Proposal. See "Other Agreements -- Voting Agreements." As of the Record
Date, directors and executive officers of Vanguard and their affiliates may be
deemed to be beneficial owners of an aggregate of approximately 21.65% of the
outstanding Vanguard Shares (including Vanguard Shares covered by the Voting
Agreements described above) and have informed Vanguard that they intend to vote
their Vanguard Shares in favor of the Merger Proposal.
 
VOTING AND REVOCATION OF PROXIES
 
     All Vanguard Shares that are entitled to vote and are represented at the
Special Meeting by properly executed proxies received prior to or at the Special
Meeting, and not revoked, will be voted at the Special Meeting in accordance
with the instructions indicated on such proxies. If no instructions are
indicated (other than in the case of broker non-votes), such proxies will be
voted in favor of the Merger Proposal.
 
     The Vanguard Board does not know of any matters other than the Merger
Proposal that are to come before the Special Meeting. If any other matters are
properly presented at the Special Meeting for consideration, including, among
other things, consideration of a motion to adjourn the Special Meeting to
another time and/or place (including, without limitation, for the purposes of
soliciting additional proxies or allowing additional time for the satisfaction
of conditions to the Merger), the persons named in the enclosed forms of proxy
and acting thereunder generally will have discretion to vote on these matters in
accordance with their judgment if so authorized by instructions given on such
proxy. Notwithstanding the foregoing, proxies voting against a specific proposal
may not be used by the persons named in the proxies to vote for adjournment of
the Special Meeting for the purpose of providing Vanguard additional time to
solicit votes to approve such proposal.
 
     Any proxy given pursuant to this solicitation may be revoked by the person
giving it at any time before it is voted. Proxies may be revoked by (1) filing
with the Secretary of Vanguard, at or before the taking of the vote at the
Special Meeting, a written notice of revocation bearing a later date than the
proxy, (2) duly executing a later-dated proxy relating to the same Vanguard
Shares and delivering it to the Secretary of Vanguard before the taking of the
vote at the Special Meeting, or (3) attending the Special Meeting and voting in
person (although attendance at the Special Meeting will not in and of itself
constitute a revocation of a proxy). Any written notice of revocation or
subsequent proxy should be sent to Vanguard Cellular Systems, Inc., 2002 Pisgah
Church Road,
 
                                       18
<PAGE>   24
 
Suite 300, Greensboro, North Carolina 27455-3314, Attention: Secretary, or be
hand delivered to the Secretary of Vanguard at or before the taking of the vote
at the Special Meeting.
 
     All expenses of Vanguard's solicitation of proxies for the Special Meeting
will be borne by Vanguard. In addition to solicitation by use of the mails,
proxies may be solicited from Vanguard shareholders by directors, officers and
employees of Vanguard in person or by telephone, telegram or other means of
communication. These directors, officers and employees will not be additionally
compensated, but may be reimbursed for reasonable out-of-pocket expenses in
connection with the solicitation. Vanguard has retained D.F. King & Co., a proxy
solicitation firm, to assist it in the solicitation of proxies for the Special
Meeting at a cost of approximately $5,000 plus reimbursement of reasonable
out-of-pocket expenses. In addition, Vanguard will make arrangements with
brokerage houses, custodians, nominees and fiduciaries for forwarding of proxy
solicitation materials to beneficial owners of Vanguard Shares held of record by
these brokerage houses, custodians, nominees and fiduciaries, and Vanguard will
reimburse these brokerage houses, custodians, nominees and fiduciaries for their
reasonable expenses.
 
                                       19
<PAGE>   25
 
                                   THE MERGER
 
     We are furnishing this Proxy Statement/Prospectus to you in connection with
the proposed merger between Merger Sub and Vanguard because you are a holder of
Vanguard Shares. If completed, the Merger will be carried out as provided in the
Merger Agreement, a copy of which is attached as Appendix A to this Proxy
Statement/Prospectus.
 
     The Merger Agreement provides that Vanguard will be merged into Merger Sub,
with Merger Sub surviving the Merger as a wholly owned subsidiary of AT&T. The
consideration to be received in the Merger for one Vanguard Share is referred to
in this Proxy Statement/Prospectus as the "MERGER CONSIDERATION."
 
     In the Merger, each outstanding Vanguard Share will be converted into the
right to receive:
 
     - 0.59805 fully paid and nonassessable AT&T Shares (the "PER SHARE STOCK
       AMOUNT"); or
 
     - $23.00 in cash, without interest (the "PER SHARE CASH AMOUNT"); or
 
     - a combination of AT&T Shares and cash.
 
     The following Vanguard Shares will not be converted into the right to
receive Merger Consideration:
 
     - Vanguard Shares held by shareholders who have not voted in favor of the
       Merger and have properly given written notice of their intent to demand
       payment for their shares if the Merger is effectuated in accordance with
       Article 13 of the North Carolina Business Corporation Act and have
       preserved their right to receive payment for such shares by taking those
       actions required by Article 13 within the time periods stipulated therein
       (collectively, the "DISSENTING SHARES"); and
 
     - Vanguard Shares held by Vanguard or any wholly owned subsidiary of
       Vanguard ("VANGUARD-HELD SHARES").
 
     On March 17, 1999, AT&T declared a three-for-two stock split of its common
shares. The record date for AT&T stockholders eligible to receive the stock
split is March 31, 1999, and the payment date for the stock split is April 15,
1999. Pursuant to the Merger Agreement, the exchange ratio for the stock portion
of the payment to be made to Vanguard shareholders in the Merger will be, and in
this Proxy Statement/Prospectus has been, adjusted to reflect the stock split
from 0.3987 shares of AT&T common stock per Vanguard share to 0.59805 shares of
AT&T common stock per Vanguard share.
 
     The total aggregate amount of consideration to be received by Vanguard
shareholders in the Merger, based on the closing price of the AT&T Shares on
March 25, 1999 and the pre-split exchange ratio of 0.3987, is approximately
$1.18 billion. After giving effect to the Merger, former holders of Vanguard
Shares that are converted into AT&T Shares will hold less than 1% of the
outstanding AT&T Shares.
 
BACKGROUND
 
     In early 1997, Vanguard began a long-term strategic planning process, the
goals of which were to position Vanguard to deal effectively with present and
anticipated changes in the telecommunications industry and to enhance the value
of shareholder investments in Vanguard. Throughout 1997, management of Vanguard
and the Vanguard Board considered various alternatives to enhance shareholder
value.
 
     In February 1998, as a result of this process, Vanguard began to focus on
reducing its debt and concentrating its operations geographically in order to
expand in the areas where Vanguard's principal operations were located and
enhance shareholder value. To that end, the Vanguard Board approved the sale of
Vanguard's Myrtle Beach, South Carolina and Florida operations, Vanguard's
interest in a
 
                                       20
<PAGE>   26
 
joint venture providing cellular services in Wilmington/Jacksonville, North
Carolina and certain minority interests in cellular markets located in the same
geographic regions as the foregoing markets. These sales were completed in June
1998, September 1998 and August 1998, respectively.
 
     At the May 19, 1998 Vanguard Board meeting, the Vanguard Board considered
whether the best way to enhance shareholder value would be to sell Vanguard,
taking advantage of the prevailing favorable capital markets and the market for
control of wireless companies. The Vanguard Board authorized the management of
Vanguard to retain the services of Wasserstein Perella & Co., Inc. as its
financial advisor to assist Vanguard in exploring its options and to consider
avenues for a potential sale of Vanguard.
 
     Thereafter, Vanguard and representatives of Wasserstein Perella prepared a
confidential memorandum containing information relating to Vanguard and its
business for distribution to potential strategic and financial purchasers of
Vanguard. Potential purchasers contacted by Wasserstein Perella that entered
into confidentiality agreements with Vanguard received the confidential
memorandum. In the memorandum, estimates of certain 1998 budgeted and 1999
projected performance measures were provided, including: (1) estimated market
penetration of 9.8% and 11.1%; (2) estimated total revenues of approximately
$337.2 million and approximately $371.7 million; (3) estimated operating cash
flow of approximately $142.0 million and approximately $170.9 million; and (4)
estimated earnings before interest, taxes, depreciation and amortization
("EBITDA") of approximately $128.2 million and $160.0 million, in each case for
1998 budget and 1999 projected, respectively.
 
     Vanguard received preliminary indications of interest from potential
purchasers in late July 1998. Three potential purchasers, including AT&T, were
selected from this group and were permitted to review extensive additional due
diligence information about Vanguard. Of these three potential purchasers, only
AT&T made a firm proposal to acquire Vanguard, which proposal was for
consideration of $22.00 per Vanguard Share in stock and cash.
 
     During August 1998, Vanguard management and Wasserstein Perella met with
representatives of AT&T on several occasions and had numerous telephone
conferences to discuss the principal terms of a possible transaction by which
AT&T might acquire Vanguard. In August 1998, Vanguard submitted to AT&T a
proposed agreement and plan of merger, and legal counsel and management for
Vanguard and AT&T met over the course of several weeks in September 1998 to
negotiate the terms of the Merger Agreement and the Vanguard Option Agreement
(as defined herein). Such negotiations, as well as negotiations with the
Shareholders (as defined herein) concerning the Voting Agreements, continued
through execution of the Merger Agreement (which was executed at the same time
as the Vanguard Option Agreement and the Voting Agreements). During this period,
AT&T and its representatives concurrently conducted an in-depth due diligence
investigation of Vanguard. Also during this period, Vanguard and its
representatives were successful in negotiating an increase in AT&T's offer to
consideration of $23.00 per Vanguard Share in stock and cash. Vanguard and
Wasserstein Perella conducted their due diligence investigation of AT&T,
including discussions with authorized employees of AT&T concerning certain
aspects of AT&T's business and affairs.
 
     Vanguard's directors were kept apprised of the status of negotiations
throughout August and September 1998 through discussions with Vanguard
management. A special meeting of the Vanguard Board to consider the proposed
transaction was held on October 1, 1998 in New York. At the meeting, the
Vanguard Board was provided with the Merger Agreement and the terms and
conditions of the proposed transaction were reviewed in detail by Vanguard
management and legal counsel. In addition, Vanguard management described the
benefits and rationales for the transaction. Representatives of Wasserstein
Perella made a detailed presentation to the Vanguard Board and advised the
Vanguard Board that, in its opinion, the Merger Consideration was fair to
Vanguard shareholders from a financial point of view. Extensive discussion and
numerous questions from Vanguard Board members followed the presentations. After
considering the matters described under "-- Vanguard's
 
                                       21
<PAGE>   27
 
Reasons for the Merger; Recommendation of the Vanguard Board," the Vanguard
Board concluded that the proposed transaction was fair to, and in the best
interests of, Vanguard and Vanguard shareholders and unanimously adopted and
approved the Merger Agreement, the Merger and the Vanguard Option Agreement.
 
VANGUARD'S REASONS FOR THE MERGER; RECOMMENDATION OF THE VANGUARD BOARD
 
     The Vanguard Board has determined that the Merger Agreement and the Merger
are fair to, and in the best interests of, Vanguard and Vanguard shareholders
and has recommended that Vanguard shareholders approve the Merger Agreement and
the Merger.
 
     During the course of its deliberations relating to the Merger Agreement and
the Merger, the Vanguard Board considered the following factors:
 
     - the terms and conditions of the Merger Agreement, including the
       consideration to be received by Vanguard shareholders and the premium to
       recent prevailing market prices represented thereby;
 
     - the opinion, analyses and presentation of Wasserstein Perella presented
       to the Vanguard Board on October 1, 1998, and the written opinion of
       October 2, 1998 from Wasserstein Perella to the effect that the Merger
       Consideration was fair from a financial point of view to Vanguard
       shareholders;
 
     - the possibility that, because the ratio at which 50% of the Vanguard
       Shares (excluding Dissenting Shares and Vanguard-held Shares) will be
       exchanged for AT&T Shares in the Merger is fixed, the value of the share
       component of the consideration received by Vanguard shareholders in the
       Merger may increase or decrease;
 
     - historical market prices and trading information with respect to Vanguard
       Shares and historical data relating to the market prices and trading
       volumes and dividends on AT&T Shares;
 
     - the Vanguard Board's familiarity with, and review of, the business,
       assets, management, competitive position and prospects of Vanguard,
       including Vanguard's prospects if it were to continue as an independent
       company;
 
     - the changing technical and competitive environment in the
       telecommunications industry, including the competitive position of AT&T
       in the industry and its substantial technological and financial
       resources, and the fact that the Vanguard Board anticipated that the
       operating climate for an independent company, such as Vanguard, could
       become increasingly competitive because of the emergence of new services,
       such as, but not limited to, personal communications services and
       enhanced specialized mobile radio, which are emerging as competitive
       technologies to cellular telephones, the trend toward the "bundling" of
       several services by a single service provider and the resultant
       competitive advantages, and the trend toward consolidation in the
       industry;
 
     - the opportunity for Vanguard shareholders, through receipt of AT&T Shares
       in the Merger, to retain a continuing interest in the telecommunications
       industry in general through a larger and more geographically diversified
       company with substantially greater resources;
 
     - the requirement that Vanguard and the Shareholders enter into the
       Vanguard Option Agreement and the Voting Agreements, respectively;
 
     - the regulatory approvals required for the Merger and the estimated length
       of time required to consummate the Merger; and
 
     - the structure of the Merger, including the anticipated tax consequences
       thereof to Vanguard and its shareholders.
 
                                       22
<PAGE>   28
 
     The foregoing discussion addresses the material facts considered by the
Vanguard Board in its consideration of the Merger. In view of the variety of
factors and the amount of information considered, the Vanguard Board did not
find it practicable to, and did not, make specific assessments of, quantify, or
otherwise assign relative weights to the specific factors considered in reaching
its determination. The determination to adopt and approve the Merger Agreement
and the Merger was made after consideration of all the factors taken as a whole,
though individual members of the Vanguard Board may have given different weights
to different factors.
 
OPINION OF THE FINANCIAL ADVISOR TO THE VANGUARD BOARD
 
     Wasserstein Perella was retained to act as financial advisor to Vanguard in
connection with the Merger. On October 1, 1998, Wasserstein Perella delivered a
financial presentation and its oral opinion, which was subsequently confirmed in
a written opinion dated as of October 2, 1998 (the "FAIRNESS OPINION"), to the
Vanguard Board that, as of the date of such opinion, and based upon the
assumptions made, matters considered and limits of review set forth in the
Fairness Opinion, the Merger Consideration is fair to shareholders of Vanguard
(other than AT&T) from a financial point of view. In connection with its
engagement, Wasserstein Perella solicited proposals from other parties with
respect to the acquisition of Vanguard or Vanguard's assets. Vanguard considered
the responses to such solicitation and determined that the Merger was the best
proposal for Vanguard.
 
     THE FULL TEXT OF THE FAIRNESS OPINION IS ATTACHED AS APPENDIX C TO THIS
PROXY STATEMENT/ PROSPECTUS. HOLDERS OF VANGUARD SHARES ARE URGED TO READ THE
FAIRNESS OPINION IN ITS ENTIRETY FOR INFORMATION WITH RESPECT TO THE PROCEDURES
FOLLOWED, ASSUMPTIONS MADE, MATTERS CONSIDERED AND LIMITS OF THE REVIEW BY
WASSERSTEIN PERELLA IN RENDERING THE FAIRNESS OPINION. REFERENCES TO THE
FAIRNESS OPINION HEREIN AND THE SUMMARY OF THE FAIRNESS OPINION SET FORTH BELOW
ARE QUALIFIED BY APPENDIX C, WHICH IS INCORPORATED HEREIN BY REFERENCE.
 
     The Fairness Opinion addresses only the fairness from a financial point of
view to Vanguard shareholders of the Merger Consideration, and it does not
address any other aspect of the Merger. Specifically, the Fairness Opinion does
not address Vanguard's underlying business decision to effect the transactions
contemplated by the Merger Agreement, nor does it address the solvency of
Vanguard or AT&T following consummation of the Merger or at any time. The
Fairness Opinion does not constitute a recommendation to any Vanguard
shareholder as to how such Vanguard shareholder should vote with respect to the
Merger. In addition, the Fairness Opinion does not express an opinion as to the
price at which AT&T Shares will or may actually trade at any time.
 
     The Fairness Opinion was prepared and delivered based upon conditions as
they existed and could be evaluated by Wasserstein Perella as of October 2,
1998. In arriving at the Fairness Opinion, Wasserstein Perella:
 
     - reviewed the Merger Agreement;
 
     - reviewed and analyzed certain publicly available business and financial
       information relating to Vanguard and AT&T for recent years and interim
       periods to date;
 
     - reviewed and analyzed certain internal financial and operating
       information, including financial forecasts, analyses and projections
       prepared by or on behalf of Vanguard and provided to Wasserstein Perella
       for purposes of its analysis;
 
     - met with management of Vanguard to review and discuss such information
       and, among other matters, Vanguard's business, operations, assets,
       financial condition and future prospects;
 
     - spoke with authorized employees of AT&T regarding AT&T's business
       operations, assets, financial condition and future prospects, as
       discussed above;
 
                                       23
<PAGE>   29
 
     - reviewed and considered certain financial and stock market data relating
       to Vanguard and certain publicly available financial and stock market
       data relating to AT&T, and compared that data with similar data for
       certain other companies, the securities of which are publicly traded,
       that it believes to be relevant or comparable in certain respects to
       Vanguard and AT&T or one or more of its respective businesses or assets;
 
     - reviewed and considered the financial terms of certain recent
       acquisitions and business combination transactions in the cellular
       telephone industry specifically and in other industries generally that
       Wasserstein Perella believed to be reasonably comparable to the Merger or
       otherwise relevant to its inquiry; and
 
     - performed other financial studies, analyses, and investigations and
       reviewed other information as Wasserstein Perella considered appropriate
       for purposes of the Fairness Opinion.
 
     In rendering the Fairness Opinion, Wasserstein Perella assumed and relied
upon, without independent verification, the accuracy and completeness of all the
financial and other information that was provided to, discussed with or publicly
available to it. Wasserstein Perella also relied upon the reasonableness and
accuracy of the financial projections, forecasts and analyses supplied to it by
management of Vanguard, and has assumed that they were reasonably prepared in
good faith on bases reflecting the best currently available judgments and
estimates of management of Vanguard. Wasserstein Perella expresses no opinion
with respect to such financial projections, forecasts and analyses, and did not
review any of the books and records of Vanguard or AT&T and does not assume any
responsibility for conducting a physical inspection of the properties or
facilities of Vanguard or AT&T or for making an independent evaluation or
appraisal of the assets or liabilities of Vanguard or AT&T. Wasserstein Perella
also assumed (1) that the Merger will qualify as a "reorganization" within the
meaning of Section 386(a) of the Internal Revenue Code of 1986, as amended (the
"CODE"), (2) that obtaining all regulatory and other approvals and third-party
consents required for consummation of the Merger will not have an adverse impact
on Vanguard or AT&T or on the anticipated benefits of the Merger, and (3) that
the transactions described in the Merger Agreement will be consummated on the
terms set forth therein, without waiver or modification of any of the material
terms or conditions.
 
     In performing its analyses for the Fairness Opinion, Wasserstein Perella
relied on numerous assumptions made by management of Vanguard, and made
judgments of its own with regard to the performance of Vanguard, industry
performance, general business and economic conditions, and other matters, many
of which are beyond Vanguard's ability to control. Any estimates contained in
such analyses are not necessarily indicative of actual values or actual future
results. In addition, analyses relating to values of companies do not purport to
be appraisals or to reflect the prices at which companies may actually be sold.
Since such estimates are inherently subject to uncertainty, neither Vanguard,
Wasserstein Perella nor any other person assumes responsibility for their
accuracy.
 
     At the October 1, 1998 meeting of the Vanguard Board, Wasserstein Perella
reviewed with the members of the Vanguard Board certain financial, industry and
market information with respect to Vanguard, the procedures used and the
analyses underlying the Fairness Opinion. The summary set forth herein does not
purport to be a complete description of the Fairness Opinion or of Wasserstein
Perella's financial presentation but does summarize all material aspects
thereof. The preparation of a fairness opinion is a complex process that is not
purely mathematical and is not necessarily susceptible to partial analyses or
summary description. It involves complex considerations and judgments.
 
     In connection with its presentation to the Vanguard Board on October 1,
1998, advising the Vanguard Board of its opinion on October 1, 1998 and
confirming its opinion in writing on October 2, 1998, representatives of
Wasserstein Perella considered and discussed various financial and other
 
                                       24
<PAGE>   30
 
matters that they deemed relevant. General valuation considerations deemed to be
relevant by Wasserstein Perella included, without limitation:
 
     - wireless communications and demographic trends as a whole in Vanguard's
       markets;
 
     - Vanguard's historical financial and operating performance and future
       prospects in the context of its business strategy, market position and
       current and prospective competition;
 
     - Vanguard's technological, marketing and product strategy;
 
     - projections for Vanguard provided by management of Vanguard;
 
     - Vanguard's size and asset mix;
 
     - terms of alternative transaction proposals, including the ability of
       potential acquirors to consummate such transactions;
 
     - potential public market trading value range of Vanguard as a stand-alone
       entity; and
 
     - publicly available commentary and research of industry analysts.
 
     Management of Vanguard prepared projections of financial performance under
three cases for Vanguard based on certain common assumptions that include (1) a
complete digital build-out and coverage to position Vanguard as a highly
competitive provider of wireless communications services in its markets, (2)
significant cutbacks in corporate headquarters' executive expenses due to
relocation of several service infrastructure functions from Greensboro, North
Carolina to the individual markets, and (3) significant downward pressure on
local and roaming revenues due to recent nationwide marketing plans by other
service providers. From the foregoing common assumptions, management of Vanguard
estimated financial performance under a low case (the "LOW CASE"), a base case
(the "BASE CASE") and a high case (the "HIGH CASE") based on additional
assumptions. The assumptions from which the Low Case was derived include a
strong market with 45% total penetration by year 2003, Vanguard holding a 30%
market share by year 2003, aggressive pricing due to competitive pressures (with
four major competitors in each market), expense cuts required due to fewer
subscribers and lower average monthly revenue per subscriber ("ARPU"), five-year
revenue compound annual growth rate ("CAGR") at 4.7% and EBITDA margins
approaching 40%. The assumptions for the Base Case include a strong market with
45% total penetration by year 2003, Vanguard holding a 40% market share by year
2003, two other successful competitors in each market, lower decline in ARPU
compared to the Low Case, five-year revenue CAGR at 11.1% and EBITDA margin
percentages of low to mid 40's. The assumptions for the High Case include a 55%
total market penetration by year 2003, Vanguard holding a 40% market share by
year 2003, lower ARPU compared to the Base Case, five-year revenue CAGR at 13.8%
and EBITDA margin percentages in the low 40's. Management of Vanguard assigned a
30% probability to the Low Case, a 50% probability to the Base Case and a 20%
probability for the High Case based on its assessment of future prospects of
Vanguard and the cellular telephone industry. Such projections do not represent
current or anticipated results, and no assurance can be given as to whether or
not such projections or the underlying assumptions would prove accurate.
 
     Financial Analyses Underlying the Fairness Opinion.  Wasserstein Perella's
analysis relied on reference ranges of implied values per Vanguard Share based
on Wasserstein Perella's judgment of the data analyzed. These reference ranges
include reference points implied by the Merger Consideration, including:
 
     - a multiple of estimated 1998 EBITDA of 12.0x;
 
     - multiples of estimated latest 12 months ending September 30, 1999 EBITDA
       of 10.6x in the Low Case, 10.0x in the Base Case and 10.5x in the High
       Case (with a probability weighted average of 10.3x);
 
                                       25
<PAGE>   31
 
     - multiples of estimated 1999 EBITDA of 10.2x in the Low Case, 9.4x in the
       Base Case and 10.1x in the High Case (with a probability weighted average
       of 9.8x); and
 
     - a price of $214 per POP.
 
     The foregoing reference points are derived with no value allocated to
Vanguard's non-core assets (which include minority interests in certain cellular
markets, certain local multi-point distribution services licenses, an equity
interest in International Wireless Communications Holdings, Inc., a
development-stage company holding equity interests in wireless businesses
primarily in Asia and Latin America, and an equity interest in Inter-Act
Systems, Inc., a development-stage kiosk-based retail promotion company).
 
     Wasserstein Perella also derived another set of reference points based on
an allocation of $30 million net value to non-core assets, and those reference
points include:
 
     - an estimated 1998 EBITDA multiple of 11.7x;
 
     - multiples of estimated latest 12 months ending September 30, 1999 EBITDA
       of 10.4x in the Low Case, 9.8x in the Base Case and 10.3x in the High
       Case (with a probability weighted average of 10.0x);
 
     - multiples of estimated 1999 EBITDA of 10.0x in the Low Case, 9.2x in the
       Base Case and 9.9x in the High Case (with a probability weighted average
       of 9.6x); and
 
     - a price of $210 per POP.
 
     All of the foregoing reference points were considered in the context of the
analyses described below.
 
     Discounted Cash Flow Analysis.  Wasserstein Perella performed a discounted
cash flow analysis based on the Low Case, the Base Case and the High Case
financial projections provided by management of Vanguard. The analysis derives a
range of present values per Vanguard Share as of January 1, 1999. The analysis
uses an estimate based on management of Vanguard projections from 1999 to 2003.
Wasserstein Perella noted that, given the nature of the cellular telephone
industry, discounted cash flow valuation ranges are extremely sensitive to
changes in both operating assumptions and valuation parameters.
 
     Wasserstein Perella believed it appropriate to, and did, utilize a discount
rate range of 11.0% to 13.0%. Wasserstein Perella also believed it appropriate
to, and did, use (1) terminal valuations based on multiples of terminal year
EBITDA (2003) of 7.0x to 10.0x and (2) perpetuity growth rate of free cash flow
of 3.5% to 4.5%.
 
     As determined by Wasserstein Perella, the reference range values were $6.00
to $12.50 per Vanguard Share in the Low Case, $20.00 to $26.00 per Vanguard
Share in the Base Case, and $25.00 to $32.00 per Vanguard Share in the High
Case, with a probability weighted average range of $16.80 to $23.15 per Vanguard
Share.
 
     With respect to the discounted cash flow analysis, Wasserstein Perella
noted that the selection of an appropriate discount rate is an inherently
subjective process, and is affected by such factors as Vanguard's cost of
capital, the uncertainty associated with achieving the projections provided by
management of Vanguard and transaction risk generally. Wasserstein Perella also
noted that the discounted cash flow analysis is a widely used valuation
methodology, but that it relies on numerous assumptions regarding the future
performance of a company and the future economic environment, including earnings
growth rates, unlevered free cash flows, terminal values and discount rates, all
of which are inherently uncertain because they are predicated upon future events
and circumstances.
 
     Precedent Merger and Acquisition Transactions Analysis.  Wasserstein
Perella reviewed and analyzed selected merger and acquisition transactions
involving other companies in the cellular
 
                                       26
<PAGE>   32
 
telephone industry that it deemed relevant. The transactions reviewed included
the following, which are listed by acquiror/seller: Dobson Communications
Corp./Sygnet Wireless Inc., Welsh, Carson, Anderson & Stowe/Centennial Cellular
Corp., ALLTEL Corporation/360 degrees Communications and American Cellular
Corporation/PriCellular Corporation. Wasserstein Perella deemed appropriate and
derived the reference ranges of 11.5x to 13.0x, as a multiple of estimated 1998
EBITDA, 9.75x to 10.50x, as a multiple of LTM EBITDA ending September 30, 1999,
and 9.25x to 10.25x, as a multiple of estimated 1999 EBITDA. Wasserstein
Perella's analysis yielded an implied value reference range of $20.00 to $23.00
per Vanguard Share in the Low Case, $22.00 to $25.00 per Vanguard Share in the
Base Case and $23.00 to $26.00 per Vanguard Share in the High Case, with a
probability weighted average range of $21.60 to $24.60 per Vanguard Share.
 
     Public Company Trading Analysis.  Wasserstein Perella reviewed, analyzed
and compared certain operating, financial and trading information of Vanguard
and eight other publicly traded cellular companies: AirTouch Communications,
Inc.; Centennial Cellular Corp.; CommNet Cellular Inc.; Cellular Communications
of Puerto Rico, Inc.; Price Communications Corporation; Rural Cellular
Corporation; United States Cellular Corporation; and Western Wireless
Corporation (collectively, the "COMPARABLE COMPANIES"). This analysis included
reviewing, analyzing and comparing the market values, adjusted market values
(defined as market value plus debt, preferred stock and minority interest less
cash and cash equivalents) (also referred to as enterprise value), estimated
adjusted market values of non-U.S. and non-cellular operations, estimated
adjusted market values of domestic cellular operations, number of domestic POPs,
and multiples derived by dividing estimated adjusted market values of domestic
cellular operations by each of domestic cellular estimated 1998 EBITDA and
estimated 1999 EBITDA of the Comparable Companies set forth herein. These values
and multiples, based on closing stock prices on September 30, 1998, are set
forth below.
 
<TABLE>
<CAPTION>
                                                       ENTERPRISE           ENTERPRISE
                                                         VALUE/               VALUE/
                                                          1998E                1999E
                                                         EBITDA               EBITDA
                                                    -----------------    -----------------
<S>                                                 <C>                  <C>
AirTouch..........................................        10.8x                10.4x
Centennial Cellular...............................        10.1x                 8.0x
CommNet Cellular..................................        11.9x                 8.9x
Cellular of Puerto Rico...........................         9.6x                 8.8x
Price Communications..............................        11.1x                 9.9x
Rural Cellular....................................        10.2x                 9.2x
US Cellular.......................................         7.5x                 6.3x
Western Wireless..................................         9.9x                 8.0x
</TABLE>
 
     Based on the above values and multiples and in Wasserstein Perella's
judgment, the appropriate reference ranges for Vanguard derived from its public
company trading analysis were 10.0x-11.0x as a multiple range of estimated 1998
EBITDA, and 8.5x-9.5x as a multiple range of estimated 1999 EBITDA, yielding a
reference range of implied public trading prices of $17.50 to $20.50 per
Vanguard Share in the Low Case, $18.00 to $22.00 per Vanguard Share in the Base
Case, and $19.00 to $21.00 per Vanguard Share in the High Case, with a
probability weighted average range of $18.05 to $21.35 per Vanguard Share.
 
     Wasserstein Perella also discussed with the Vanguard Board certain aspects
of AT&T's business and prospects thereof based on publicly available
information, the discussions with authorized employees of AT&T referred to above
and recent analyst reports.
 
                                       27
<PAGE>   33
 
     In addition to the above-outlined analyses, Wasserstein Perella performed
such other valuation analyses as it deemed appropriate in determining the
fairness to Vanguard shareholders of the Merger Consideration to be received in
the Merger. Wasserstein Perella concluded, based on the full range of its
analyses, that the Merger Consideration to be paid in the Merger was fair from a
financial point of view to Vanguard shareholders.
 
     Wasserstein Perella is an investment banking firm engaged, among other
things, in the valuation of businesses and their securities in connection with
mergers and acquisitions, negotiated underwritings, competitive biddings, and
secondary distributions of listed and unlisted securities, and private
placements. Wasserstein Perella was selected to render a fairness opinion
because it is a nationally recognized investment banking firm and because of its
experience in the valuation of companies, including companies in the cellular
telephone industry.
 
     Terms of Wasserstein Perella's Engagement.  Pursuant to the terms of an
engagement letter, dated April 7, 1997, supplemented by another engagement
letter, dated June 30, 1998, Vanguard agreed to pay Wasserstein Perella a
transaction fee equal to 0.45% of the aggregate consideration, based on the
total value of equity, debt, obligations and liabilities paid, payable, assumed
or otherwise repaid in the Merger, to be paid as follows: (1) $1,500,000 of such
transaction fee to be paid on the date on which, at Vanguard's request,
Wasserstein Perella informed Vanguard that it was prepared to render a fairness
opinion, and (2) the remainder of such transaction fee, which is contingent upon
consummation of the Merger, to be paid on the Closing Date (as defined herein).
Both Wasserstein Perella and Vanguard can terminate the Wasserstein Perella
engagement, upon 30 days' prior notice to the other, provided that,
notwithstanding any termination, Wasserstein Perella is entitled to the full
transaction fee if, during the 12-month period after the termination by
Vanguard, a definitive agreement is executed for a transaction and the
transaction is consummated any time thereafter. Vanguard also agreed to
reimburse Wasserstein Perella for its out-of-pocket expenses, including
reasonable fees and disbursements of its counsel. Vanguard agreed to indemnify
Wasserstein Perella and its affiliates, their respective directors, officers,
partners, agents and employees and each person, if any, controlling Wasserstein
Perella or any of its affiliates against certain liabilities and expenses,
including certain liabilities under the U.S. federal securities laws, relating
to or arising out of such engagement.
 
     From time to time, Wasserstein Perella has provided investment banking
services to Vanguard. Wasserstein Perella advised Vanguard in the sale of
certain assets of Vanguard Cellular Systems of South Carolina, Inc., and in the
sale of the assets of Western Florida Cellular Telephone Corp. and related
minority owned cellular interests. Wasserstein Perella received customary fees
for such services. In the ordinary course of business, Wasserstein Perella may
actively trade the debt and equity securities of Vanguard and AT&T for its own
account and for the account of its customers and, accordingly, may at any time
hold a long or short position in such securities.
 
AT&T'S REASONS FOR THE MERGER
 
     AT&T believes that the Merger is in the best interests of AT&T and its
shareholders. AT&T expects the Merger to enable it to enhance its ability to
offer nationwide wireless services to business and retail customers, to permit
AT&T to more effectively manage the components of the infrastructure comprising
its nationwide wireless services and, particularly, to integrate the wireless
infrastructure of Vanguard's core service areas with that of AT&T on a more
seamless and cost effective basis. AT&T expects the Merger also to enable more
effective marketing of nationwide wireless services to customers in Vanguard's
core service areas and, thereby, to strengthen its overall strategic
positioning.
 
                                       28
<PAGE>   34
 
EFFECTIVE TIME OF THE MERGER
 
     The Merger will become effective (1) when articles of merger (the "ARTICLES
OF MERGER") are filed with the Secretary of State of North Carolina in such form
as is required by and executed in accordance with Section 55-11-05 of the North
Carolina Business Corporation Act and a certificate of merger (the "CERTIFICATE
OF MERGER") is filed with the Secretary of State of Delaware in accordance with
Sections 251 and 252 of the Delaware General Corporation Law or (2) at such
other time as AT&T and Vanguard shall agree in writing should be specified in
the Articles of Merger and the Certificate of Merger (the date and time the
Merger becomes effective being the "EFFECTIVE TIME").
 
     The Effective Time will occur at 8 a.m. on the first business day after the
satisfaction or waiver of the conditions to the Merger, provided that, if such
conditions are satisfied or waived upon completion of the Special Meeting, the
Effective Time will occur within three to five business days thereafter.
 
CERTIFICATE OF INCORPORATION AND BYLAWS
 
     The Certificate of Incorporation of Merger Sub in effect immediately prior
to the Effective Time will be the certificate of incorporation of the surviving
corporation of the Merger, until thereafter amended or as provided therein by
applicable law. The bylaws of Merger Sub in effect immediately prior to the
Effective Time will be the bylaws of the surviving corporation of the Merger,
until thereafter amended or as provided therein by applicable law.
 
DIRECTORS AND OFFICERS
 
     The directors and officers of Merger Sub will be the directors and
officers, respectively, of the surviving corporation of the Merger, until they
resign, are removed from office, or they otherwise cease to be a director or
officer, or until their respective successors are duly elected and qualified.
 
MATERIAL FEDERAL INCOME TAX CONSEQUENCES
 
     The following is a summary description of the material U.S. federal income
tax consequences of the Merger applicable to Vanguard shareholders. This summary
is not a complete description of all the tax consequences of the Merger and is
based on the Code, Treasury Regulations and rulings thereunder and judicial
opinions, all as in effect on the date of this Proxy Statement/Prospectus. Each
Vanguard shareholder's individual circumstances may affect the tax consequences
of the Merger to such Vanguard shareholder, and the particular facts or
circumstances of a Vanguard shareholder that may so affect the consequences are
not considered in the discussion below. The summary may not apply to Vanguard
shareholders in special situations, such as dealers or traders in securities,
financial institutions, tax-exempt organizations, insurance companies, persons
holding Vanguard Shares or AT&T Shares as part of a hedging, straddle,
conversion or other integrated transaction, non-U.S. persons, persons whose
functional currency is not the U.S. dollar and Vanguard shareholders who
acquired Vanguard Shares pursuant to an employee stock option or otherwise as
compensation. In addition, no information is provided herein with respect to the
tax consequences of the Merger under state, local or foreign laws. Consequently,
each Vanguard shareholder is advised to consult a tax advisor as to the specific
tax consequences of the Merger to such Vanguard shareholder.
 
     Neither AT&T nor Vanguard has requested or will request an advance ruling
from the Internal Revenue Service as to the tax consequences of the Merger. It
is a non-waivable condition to the Merger that AT&T receive an opinion from
Wachtell, Lipton, Rosen & Katz, its special counsel, and that Vanguard receive
an opinion from Latham & Watkins, its special counsel, each stating that the
Merger will be treated for U.S. federal income tax purposes as a
"reorganization" within the meaning of Section 368(a) of the Code. Such opinions
will be based upon certain customary assumptions and
 
                                       29
<PAGE>   35
 
factual representations. Assuming that the Merger is a reorganization, none of
AT&T, Vanguard or Merger Sub will recognize gain or loss as a result of the
Merger. The following discussion of U.S. federal income tax consequences of the
Merger to Vanguard shareholders assumes that the Merger will qualify as a
"reorganization" within the meaning of Section 368(a) of the Code for U.S.
federal income tax purposes.
 
     As discussed below, the U.S. federal income tax consequences of the Merger
to a Vanguard shareholder depend on the form of consideration received by the
shareholder.
 
     Exchange of Vanguard Shares Solely for AT&T Shares.  A Vanguard shareholder
who receives solely AT&T Shares in exchange for all Vanguard Shares owned by
such Vanguard shareholder will not recognize any gain or loss upon such exchange
for U.S. federal income tax purposes. The tax basis of the AT&T Shares received
in the exchange will equal the basis of the Vanguard Shares surrendered in
exchange therefor and, provided that the Vanguard Shares surrendered were held
as capital assets at the time of the exchange, the holding period of the AT&T
Shares received will include the holding period of the Vanguard Shares
surrendered therefor. (See the discussion below under "-- Cash in lieu of
Fractional Shares" for the U.S. federal income tax consequences of the receipt
of cash in lieu of fractional AT&T Shares.)
 
     Exchange of Vanguard Shares for Cash and AT&T Shares.  If the consideration
received in the Merger by a Vanguard shareholder consists of part cash and part
AT&T Shares and the shareholder's adjusted basis in the shareholder's Vanguard
Shares is less than the fair market value, as of the date of the Merger, of the
AT&T Shares and cash received by the shareholder, then the shareholder will
recognize a gain. This recognized gain will equal the lesser of (1) the excess,
if any, of the fair market value, as of the date of the Merger, of the AT&T
Shares and cash received over the adjusted basis of the Vanguard Shares
surrendered in exchange therefor and (2) the amount of cash received in the
exchange. However, if a Vanguard shareholder's adjusted basis in the Vanguard
Shares surrendered in the transaction is more than such fair market value of the
AT&T Shares and cash received, such Vanguard shareholder's loss will not be
currently allowed or recognized for U.S. federal income tax purposes.
 
     In the case of a shareholder who recognizes gain on the exchange, if the
exchange does not have the effect of a distribution of a dividend (as discussed
below) and the Vanguard Shares exchanged were held as capital assets by the
Vanguard shareholder, the gain will be characterized as a capital gain. If the
exchange does have the effect of a distribution of a dividend, such gain will be
taxable as a dividend to the extent of the shareholder's ratable share of
available earnings and profits (and the remainder, if any, of such recognized
gain will be capital gain if the Vanguard Shares exchanged were held as capital
assets by the Vanguard shareholder).
 
     The determination of whether the exchange has the effect of the
distribution of a dividend will be made in accordance with Section 302 of the
Code, taking into account the stock ownership attribution rules of Section 318
of the Code. Under those rules, for purposes of determining whether the exchange
has the effect of a distribution of a dividend, a Vanguard shareholder is
treated as if (a) such Vanguard shareholder's entire interest were first
exchanged for AT&T Shares and (b) a portion of those AT&T Shares were then
redeemed for the cash actually received in the Merger. The Vanguard
shareholder's hypothetical interest in AT&T (both actual and constructive) after
hypothetical step (a) is compared to such Vanguard shareholder's hypothetical
interest in AT&T (both actual and constructive) after hypothetical step (b).
Dividend treatment will apply unless the shareholder's interest has been
sufficiently reduced. While the determination is based on a Vanguard
shareholder's particular facts and circumstances, the IRS has indicated in
published rulings that a distribution that results in any actual reduction in
interest of an extremely small minority shareholder in a publicly held
corporation will meaningfully reduce the shareholder's interest in the
corporation,
 
                                       30
<PAGE>   36
 
and, therefore, will result in capital gain treatment for shareholders who hold
the shares as capital assets if the shareholder exercises no control with
respect to corporate affairs.
 
     BECAUSE THE DETERMINATION OF WHETHER A PAYMENT WILL BE TREATED AS HAVING
THE EFFECT OF THE DISTRIBUTION OF A DIVIDEND WILL GENERALLY DEPEND UPON THE
FACTS AND CIRCUMSTANCES OF EACH VANGUARD SHAREHOLDER, VANGUARD SHAREHOLDERS ARE
STRONGLY ADVISED TO CONSULT THEIR OWN TAX ADVISORS REGARDING THE TAX TREATMENT
OF CASH RECEIVED IN THE MERGER, INCLUDING THE APPLICATION OF THE CONSTRUCTIVE
OWNERSHIP RULES OF THE CODE AND THE EFFECT OF ANY TRANSACTIONS IN SHARES OF AT&T
BY THE VANGUARD SHAREHOLDER.
 
     A Vanguard shareholder's basis in the AT&T Shares received in the Merger
will equal such shareholder's basis in the shareholder's Vanguard Shares reduced
by any cash received in the Merger and increased by any gain recognized on the
Merger. Provided that the Vanguard Shares surrendered were held as capital
assets at the time of the Merger, the holding period of the AT&T Shares received
will include the holding period of the Vanguard Shares surrendered.
 
     Exchange of Vanguard Shares Solely for Cash.  A Vanguard shareholder who
receives cash in exchange for all the shareholder's Vanguard Shares will
generally recognize a gain or loss for U.S. federal income tax purposes equal to
the difference between the cash received and the shareholder's tax basis in the
Vanguard Shares surrendered in exchange therefor. Assuming that such shareholder
holds the Vanguard Shares as capital assets, such gain or loss will be capital
gain or loss, and will be long-term capital gain or loss if the shareholder's
holding period is more than one year. There are limitations on the extent to
which shareholders may deduct capital losses from ordinary income. If a Vanguard
shareholder who receives only cash in exchange for all such shareholder's
Vanguard Shares constructively owns Vanguard Shares before the Merger or
actually or constructively owns AT&T Shares after the Merger (as the result of
constructive ownership of Vanguard Shares that are exchanged for AT&T Shares in
the Merger, prior actual or constructive ownership of AT&T Shares or otherwise),
the cash received by such shareholder may, in certain circumstances, be taxed as
a dividend, and such shareholders should consult their tax advisors. The
circumstances under which dividend treatment may apply and the consequences
thereof are similar to those discussed above applicable to Vanguard shareholders
who receive cash and AT&T Shares in the Merger, except that the amount treated
as a dividend would not be limited to the amount of such shareholder's gain
recognized in the transaction and it is possible that there would be some
variation in the manner in which the provisions of Section 302 of the Code,
discussed above, would be applied.
 
     Special Rules for Shareholders that are Corporations.  To the extent that
cash received in exchange for Vanguard Shares is treated as a dividend to a
corporate shareholder of Vanguard Shares, such shareholder will be (1) eligible
for a dividends received deduction (subject to applicable limitations) and (2)
subject to the "extraordinary dividend" provisions of the Code. Under recently
enacted legislation, any such cash which is treated as a dividend to a corporate
shareholder will constitute an extraordinary dividend. Consequently, the
nontaxed portion of any such dividend would reduce a corporate shareholder's
adjusted tax basis in the AT&T Shares received in the Merger, but not below
zero, and would thereafter be taxable as capital gain.
 
     Cash in lieu of Fractional Shares.  Holders of Vanguard Shares who receive
cash in lieu of fractional AT&T Shares will be treated as having first received
such fraction of an AT&T Share and then as having received cash in exchange for
the fractional share interest. Thus, such holders will generally recognize gain
or loss in an amount equal to the difference between the amount of cash received
in lieu of fractional AT&T Shares and the portion of the basis in the Vanguard
Shares allocable to the fractional interest.
 
     Dissenters.  The transaction will be a taxable event for U.S. federal
income tax purposes for holders of Vanguard Shares who exercise Dissenters'
Rights and receive cash in exchange for their
 
                                       31
<PAGE>   37
 
Vanguard Shares in connection therewith. Such a Vanguard shareholder will be
taxed based on principles similar to the principles described above that are
applicable to Vanguard shareholders who receive solely cash in the Merger.
 
     Backup Withholding.  Unless an exemption applies, the Exchange Agent (as
defined herein) will be required to withhold, and will withhold, 31% of any
payments to which a Vanguard shareholder or other payee is entitled pursuant to
the Merger Agreement unless the Vanguard shareholder or other payee provides
such shareholder's or payee's taxpayer identification number (social security
number or employer identification number) and certifies that such number is
correct. Each Vanguard shareholder and, if applicable, each other payee should
complete and sign the Substitute Form W-9 that will be included as part of the
transmittal letter to avoid backup withholding unless an applicable exemption
exists and is proved in a manner satisfactory to AT&T and the Exchange Agent.
 
ACCOUNTING TREATMENT
 
     The Merger will be treated as a "purchase" and, as such, the purchase price
will be allocated to the assets and liabilities of Vanguard based on their
estimated fair market values at the date of acquisition.
 
CONSENTS AND REGULATORY APPROVALS
 
     Antitrust.  As a condition to the Merger and under law, AT&T and Vanguard
must observe the notification and waiting period requirements of the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the rules
and regulations promulgated thereunder. The Hart-Scott-Rodino Antitrust
Improvements Act provides for an initial 30-calendar-day waiting period
following the filing with the U.S. Federal Trade Commission and the Antitrust
Division of the U.S. Department of Justice of certain Notification and Report
Forms by the parties to the Merger.
 
     On October 26, 1998, AT&T and Vanguard filed the Notification and Report
Forms with the Department of Justice and the Federal Trade Commission for review
in connection with the Merger. The applicable waiting periods were granted early
termination by the Federal Trade Commission. Notwithstanding expiration of the
waiting periods, at any time before or after the Effective Time, the Federal
Trade Commission, the Department of Justice or others could take action under
the antitrust laws with respect to the Merger, including seeking to enjoin the
consummation of the Merger or seeking the divestiture by AT&T of all or part of
the shares or assets of Vanguard, or of other business conducted by AT&T, or
seeking to subject AT&T or Vanguard to certain operating conditions, before or
after the Merger is completed. There can be no assurance that a challenge to the
Merger will not be made or that, if such a challenge is made, AT&T will prevail.
 
     Federal Communications Commission.  In addition, as a condition to the
Merger and under law, Vanguard and AT&T are required to obtain approvals from
the FCC. On October 27, 1998, Vanguard and AT&T filed the required applications
with the FCC, seeking approval of the transfer of control to AT&T of the FCC
radio and international operating licenses and authorizations held by certain
Vanguard subsidiaries. On March 11, 1999, Vanguard and AT&T received the FCC
approvals from the Staff of the FCC, which will become final on April 21, 1999
if no appeals are filed with respect thereto and if the Commission of the FCC
itself does not reconsider the Staff approval.
 
     State Governmental Authorities.  The Merger is subject to state regulatory
consent from the Pennsylvania Public Utility Commission, which has been
obtained.  The Merger is also subject to state regulatory notifications in
Maine, West Virginia, Ohio and Kentucky which must be made, and AT&T and
Vanguard intend to make, from 14 days prior to completion of the Merger to 10
days subsequent to completion of the Merger, varying by state.
 
                                       32
<PAGE>   38
 
     Other Consents.  Under the Merger Agreement, Vanguard must obtain consent
to the Merger from lenders under Vanguard's loan agreement, to the extent it
remains outstanding immediately prior to Effective Date, and from NACN, Inc.
with respect to the North American Cellular Services Agreements. Both of those
consents have been obtained. The Merger is also subject to Vanguard obtaining
other consents, the failure of which to obtain could reasonably be expected to
have a material adverse effect (as defined in the Merger Agreement) on Vanguard.
 
VANGUARD DEBENTURES
 
     It is a condition to consummation of the Merger that either (1) all of
Vanguard's $200 million outstanding 9 3/8% Senior Debentures due 2006 have been
covenant defeased (and all conditions thereto satisfied) in accordance with the
covenant defeasance provisions of Sections 6.1 and 6.1A of the Indenture, dated
as of April 1, 1996, as amended by the First Supplemental Indenture thereto,
dated as of April 1, 1996, by and between Vanguard and The Bank of New York,
pursuant to which the Debentures were issued or (2) a supplemental indenture to
the Indenture containing certain amendments to the Indenture (the "PROPOSED
AMENDMENTS") has become effective and the provisions thereof shall have become
operative, pursuant to which substantially all of the covenants of the Indenture
that may be deleted from the Indenture with the consent of a majority in
principal amount of outstanding Debentures shall no longer apply to or restrict
the operations of Vanguard and its successors. In connection therewith, on
November 4, 1998, Vanguard commenced a tender offer to purchase any and all of
the Debentures and a solicitation of consents to effect the Proposed Amendments.
As of November 18, 1998, consents were received from holders of more than a
majority in aggregate principal amount of Debentures outstanding. In connection
therewith, the supplemental indenture containing the Proposed Amendments was
executed. On December 3, 1998, Vanguard consummated the tender offer by
accepting $196,724,000 in outstanding principal amount of Debentures for
payment. In connection therewith, the Proposed Amendments became operative with
respect to the Indenture.
 
LISTING OF THE AT&T SHARES ON THE NYSE
 
     In the Merger Agreement, AT&T has agreed to use reasonable best efforts to
cause AT&T Shares that are to be issued pursuant to the Merger Agreement to be
listed for trading on the NYSE. Such authorization for listing, subject to
official notice of issuance, is a condition to the obligations of AT&T, Merger
Sub and Vanguard to complete the Merger.
 
RESALE OF AT&T SHARES ISSUED IN THE MERGER; VANGUARD AFFILIATES
 
     AT&T Shares to be issued to Vanguard shareholders in connection with the
Merger will be freely transferable under the Securities Act of 1933, as amended,
except for AT&T Shares issued to any person deemed to be an affiliate of
Vanguard for purposes of Rule 145 under the Securities Act at the time of the
Special Meeting. Such persons may not sell their AT&T Shares acquired in
connection with the Merger except pursuant to an effective registration
statement under the Securities Act covering such AT&T Shares, or in compliance
with Rule 145 promulgated under the Securities Act or another applicable
exemption from the registration requirements of the Securities Act. Pursuant to
the Merger Agreement, Vanguard has delivered to AT&T a letter identifying all
persons who at the time of the Special Meeting may be deemed to be affiliates of
Vanguard. It is a condition to the Merger that each person identified in such
letter deliver to AT&T an agreement with respect to the disposition of AT&T
Shares received in the Merger and other matters customary for transactions of
such type.
 
                                       33
<PAGE>   39
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
     In considering the recommendations of the Vanguard Board with respect to
the Merger, Vanguard shareholders should be aware that certain members of
Vanguard management and of the Vanguard Board have interests in the Merger that
may be considered different from, or in addition to, the interests of the
shareholders of Vanguard generally. The Vanguard Board was aware of such
interests and considered them, among other matters, in approving the Merger
Agreement and the Merger. See also "The Merger Agreement -- Indemnification" and
"The Merger Agreement -- Employee Benefits."
 
     Employment Agreements.  Pursuant to the terms of pre-existing employment
agreements, each of Messrs. Griffin, Leeolou and Preyer (the "VANGUARD
FOUNDERS") is entitled to receive a lump sum payment in the event his employment
is terminated after the Merger without cause or upon certain events which result
in the diminution of his position, his relocation or a change in travel
obligations. The amount of the severance payment in each case is equal to 2.99
times the Vanguard Founder's average annual total cash compensation for the
immediately preceding five fiscal years of Vanguard; provided, however, that the
severance payment shall be reduced to the extent necessary to avoid application
of the provisions of Sections 280G and 4999 of the Code (which provisions impose
excise taxes on, and deny the payor a deduction for, certain payments made in
connection with a change in control, as defined therein). If the employment of
each Vanguard Founder is terminated immediately after the Merger, the estimated
value of the severance payments for Messrs. Griffin, Leeolou and Preyer would be
$2,196,000, $2,112,000 and $1,990,000, respectively.
 
     Pursuant to the Merger Agreement, Vanguard is permitted to amend the
employment agreements with each of the Vanguard Founders to provide that the
severance payments thereunder will be payable no later than 90 days after the
Effective Time; provided that with respect to each Vanguard Founder, at the time
of such payment, such Vanguard Founder is otherwise in compliance with his
employment agreement and such amendment is otherwise on terms and conditions
reasonably acceptable to AT&T. Vanguard has informed AT&T that it intends to so
amend such employment agreements.
 
     Tax Reimbursement Agreements.  Vanguard entered into Tax Reimbursement
Agreements on July 22, 1998, which agreements replaced prior agreements to the
same effect originally entered into in 1987 that expired on September 30, 1998,
with the Vanguard Founders as well as each of Stuart S. Richardson and Stephen
L. Holcombe, pursuant to which each Vanguard Founder, Mr. Richardson and Mr.
Holcombe are entitled to receive, upon the Merger, payment equal to the amount
of income tax paid in 1991 and 1992 (the "TAX REIMBURSEMENT AMOUNTS") on amounts
includable in their respective incomes as a result of the lapse of restrictions
on certain Vanguard Shares. The Tax Reimbursement Agreements, however, limit the
Tax Reimbursement Amounts to amounts that would not be subject to the provisions
of Sections 280G and 4999 of the Code. Under the Merger Agreement, AT&T has
agreed to pay, within 90 days after the Merger, such Tax Reimbursement Amounts
to Messrs. Griffin, Leeolou, Preyer, Richardson and Holcombe, which Vanguard has
informed AT&T are anticipated to be $5,278,000, $5,278,000, $5,278,000, $992,000
and $165,000, respectively.
 
     Executive Officer Long-Term Incentive Compensation Plan.  Under the terms
of the pre-existing Vanguard Executive Officer Long-Term Incentive Compensation
Plan (the "LONG TERM PLAN"), which was amended on July 22, 1998 to extend the
expiration date from September 30, 1998 to September 30, 2003, each of the
Vanguard Founders will become entitled to receive $500,000 and Mr. Richardson
will become entitled to receive $94,000 on the 90th day following the Merger. If
the Merger had not been approved by the Vanguard Board, the Vanguard Founders
and Mr. Richardson would have been entitled to such payments under the Long Term
Plan only upon the attainment of certain performance goals, as enumerated in the
Long Term Plan.
 
                                       34
<PAGE>   40
 
     Senior Management Severance Plan.  Under the terms of the pre-existing
Vanguard Senior Management Severance Plan, each of Stephen L. Holcombe, Richard
C. Rowlenson, Timothy G. Biltz, Dennis B. Francis and S. Tony Gore, III (the
"SENIOR EXECUTIVES") are entitled to receive a lump sum severance payment should
his employment be terminated following the Merger without cause or because of a
change in position or employment conditions. The amount of the severance payment
is equal to 2.99 times the Senior Executive's average annual total cash
compensation for the immediately preceding five fiscal years of Vanguard;
provided, however, that the severance payment shall be reduced to the extent
necessary to avoid application of the provisions of Sections 280G and 4999 of
the Code. If the employment of each of Messrs. Holcombe, Rowlenson, Biltz,
Francis and Gore were terminated immediately after the Merger, the estimated
value of their severance payments would be $809,000, $809,000, $783,000,
$670,000 and $551,000, respectively.
 
     Pursuant to the Merger Agreement, Vanguard is permitted to amend existing
severance agreements under the Vanguard Senior Management Severance Plan with
each of the Senior Executives, in form and substance and pursuant to
documentation reasonably acceptable to AT&T, to provide that, notwithstanding
whether such Senior Executive is terminated without cause, the payments due
thereunder upon termination of employment without cause following a change of
control shall be made upon the earlier to occur of (1) six months following the
Effective Time or (2) 12 months following the date of the Merger Agreement, in
each case if such person continues to perform services for a period of six
months following the Effective Date or such shorter period as requested by AT&T,
and on other reasonable terms to be provided by AT&T. Vanguard has informed AT&T
that it intends to so amend such severance agreements.
 
     Employee Stock Options.  Under Vanguard's Amended and Restated Stock
Compensation Plan, the 1989 Stock Plan and the Restated 1994 Long Term Incentive
Plan (collectively, the "VANGUARD STOCK OPTION PLANS"), Vanguard or its
subsidiaries have granted options to purchase Vanguard Shares ("OPTIONS"). In
accordance with the terms of the Merger Agreement, the Compensation Committee of
the Vanguard Board intends to accelerate the vesting of Options to purchase
136,500 Vanguard Shares for each Vanguard Founder prior to the Effective Time.
With respect to other optionees, under the Merger Agreement, Options that are
not vested as of the date of the Special Meeting may be accelerated by action of
the Vanguard Board to such date if (1) the Merger is approved at the Special
Meeting and (2) the holder of such Options signs a consent that such holder will
be entitled to receive only cash upon exercise of such Options. Vanguard has
informed AT&T that it intends to take such action.
 
     Under the Merger Agreement, subject to AT&T's consent, each Vanguard
Founder, as well as Mr. Richardson and each Senior Executive, may be loaned by
Vanguard the amount necessary to exercise his vested Options and the amount
necessary to satisfy the tax withholding associated therewith on a part recourse
and part nonrecourse basis (which will become fully recourse upon the Merger).
Such loans would be secured by, among other things, the Vanguard Shares issued
upon the exercise of such Options and any amounts due under employment
agreements, Tax Reimbursement Agreements and the Vanguard Senior Management
Severance Plan (as described above) and would become due and payable upon the
Merger to the extent of any cash received in the Merger and 90 days following
the Merger for any remaining balance, if the Merger is consummated, or five
years from the date of loan, if the Merger is not consummated. As of December
31, 1998, Messrs. Griffin, Leeolou, Preyer and Richardson had exercised 550,062,
467,062, 472,062 and 137,000 Options, respectively, borrowing $9,401,061,
$7,791,301, $7,888,275 and $2,407,487, respectively. As of March 22, 1999,
Messrs. Griffin, Leeolou, Preyer, Richardson, Holcombe, Rowlenson, Biltz,
Francis and Gore had 319,938, 402,938, 397,938, 81,250, 285,899, 251,299,
60,299, 10,100 and 91,949 Options that will be exercisable prior to the
Effective Time, respectively. Assuming that each Vanguard Founder and each
Senior Executive and Mr. Richardson exercises all of his outstanding vested
Options and assuming that the value of the Vanguard Shares at the time of
exercise is $23.00
 
                                       35
<PAGE>   41
 
per Vanguard Share, then the maximum amount of each Vanguard Founder's loan
would be $14,160,560, and the maximum amount of the loan to each of Messrs.
Richardson, Holcombe, Rowlenson, Biltz, Francis and Gore would be $3,410,601,
$5,465,453, $4,857,201, $1,149,562, $174,415, and $1,658,520, respectively.
Vanguard Shares acquired upon exercise of Options by any person who is not a
party to a Voting Agreement, the purchase price for which is borrowed from
Vanguard, will be required to be voted in favor of the Merger, and may not be
sold, transferred or disposed of before March 31, 1999.
 
     Vanguard Founders and Senior Executives who exercise their Options and
thereby acquire Vanguard Shares will receive the Merger Consideration for such
Vanguard Shares in the Merger. The Merger Agreement provides that, at the
Effective Time, each Option, whether or not then currently exercisable, shall be
canceled and the Option holder shall receive from AT&T cash equal to the product
of (a) $23.00, less the exercise price per share of such Option, times (b) the
number of Vanguard Shares that may be purchased upon exercise of such Option.
 
     As of March 22, 1999, Vanguard's non-employee directors, Doris R. Bray,
Robert A. Silverberg, F. Cooper Brantley and Robert M. DeMichele (the
"NON-EMPLOYEE DIRECTORS") held Options to purchase an aggregate of 33,000
Vanguard Shares pursuant to the Vanguard Stock Option Plans and the 1996 Stock
Option Plan for Non-Employee Directors, all of which were exercisable. Assuming
that the Non-Employee Directors do not exercise any of their Options prior to
the Merger, then, upon the Merger, Doris R. Bray, Robert A. Silverberg, F.
Cooper Brantley and Robert M. DeMichele will receive $56,178, $29,930, $29,930
and $56,178, respectively, in exchange for their outstanding Options.
 
     Additionally, as of March 22, 1999, the Senior Executives and Mr.
Richardson (as a group) held Options to purchase an aggregate of 286,300
Vanguard Shares, which Options would not be exercisable prior to the Effective
Time. Messrs. Richardson, Holcombe, Rowlenson, Biltz, Francis and Gore will
receive in the Merger, or upon exercise prior thereto (assuming that the Senior
Executives execute the consent referred to above), approximately $389,625,
$516,825, $516,825, $516,825, $496,025, and $422,775, respectively, in exchange
for their Options that are currently unexercisable.
 
OTHER
 
     Paging Business.  On July 31, 1998, Vanguard purchased NationPage, Inc., a
leading regional paging provider in Pennsylvania and New York, for approximately
$28.5 million. In addition, as part of its business, Vanguard resells paging
services (together with NationPage, Inc., the "VANGUARD PAGING BUSINESS"). In
connection with the sale of the Advanced Messaging Division of AT&T Wireless
Services, Inc., an AT&T subsidiary, and a nationwide 50KHz/50KHz Narrowband
Personal Communication Services License to Metrocall, Inc., AT&T Wireless
agreed, among other things, that, if AT&T Wireless or its affiliates purchase
stock or assets of an entity with a business providing paging services during a
specified period, they will offer to sell such paging business to Metrocall upon
terms and conditions as Metrocall and AT&T Wireless may mutually agree.
Accordingly, upon completion of the Merger, AT&T will offer to sell the Vanguard
Paging Business to Metrocall. If AT&T and Metrocall cannot agree on a price for
the Vanguard Paging Business, AT&T will obtain a valuation from a nationally
recognized investment banker. If Metrocall elects not to purchase the Vanguard
Paging Business at such valuation price, AT&T may operate such business (or sell
such business) thereafter.
 
     Litigation and Proceedings Concerning International Wireless Communications
Holdings, Inc.  As of December 31, 1997, Vanguard owned approximately 29% of
International Wireless Communications Holdings, Inc. ("IWCH"). IWCH is a
development stage company specializing in securing, building and operating
wireless businesses, primarily in Asia and Latin America. For the years ended
December 31, 1996 and 1997, losses recognized by Vanguard related to IWCH were
 
                                       36
<PAGE>   42
 
$11.5 million and $1.5 million, respectively. Since December 31, 1996,
Vanguard's investment in IWCH has had a carrying value of zero.
 
     IWCH and International Wireless Communications, Inc., an affiliate of IWCH,
projected that they would need to raise substantial funds to satisfy their 1998
funding and operational obligations. As a result, in part, of IWCH's failure to
raise sufficient funds, IWCH and its affiliates, International Wireless
Communications, Inc., Radio Movil Digital Americas, Inc., International Wireless
Communications Latin America Holdings, Ltd. and Pakistan Wireless Holdings
Limited filed separate petitions for relief under Chapter 11 of the Bankruptcy
Code in the United States Bankruptcy Court for the District of Delaware on
September 3, 1998 (the "BANKRUPTCY CASE"). On December 21, 1998, the Bankruptcy
Court in the Bankruptcy Case approved the Debtors' Second Amended Disclosure
Statement for Debtors' Second Amended Joint Chapter 11 Plan of Reorganization. A
group of IWCH shareholders, among others, filed objections to the confirmation
of the Plan. The hearing on the confirmation of the Debtors' Second Amended
Joint Chapter 11 Plan of Reorganization (the "PLAN") was held in February 1999.
 
     Under the Plan, IWCH's investments in Pakistan and Brazil will form the
core of IWCH's post-bankruptcy operations. There may be, however, numerous
political, economic and legal uncertainties surrounding these investments which,
along with market conditions, could decrease the ability of IWCH to realize
value from them. In addition, there is no assurance as to when or on what terms
the Plan may eventually be confirmed.
 
     The Plan also incorporates a settlement between the debtors and Vanguard.
Under the Plan, Vanguard and the debtors have agreed that Vanguard will:
 
     - waive all distributions under the Plan in respect of certain pre-petition
       claims;
 
     - permit the debtors to repay and satisfy all obligations in respect of a
       $4.6 million "debtor-in-possession" loan facility (under which Vanguard
       will be the lender) via a distribution of new IWCH common stock;
 
     - transfer to the debtors 100% of its equity interests in Vanguard
       Pakistan, Inc.;
 
     - provide the debtors with a 17.5% interest in a company ("New Vanguard
       Sub") holding an interest in Star Digitel Limited ("Star Digitel");
 
     - through New Vanguard Sub, receive 100% of the debtors' remaining equity
       interest in Star Digitel;
 
     - provide credit support for certain obligations of the debtors that will
       provide the debtors with approximately $7,000,000 of needed
       post-bankruptcy funds for operations;
 
     - re-allocate its pro-rata distribution of certain warrants;
 
     - receive certain releases provided in the Plan; and
 
     - receive certain warrants to purchase shares of common stock of
       post-bankruptcy IWCH and of the entity that will hold IWCH's business in
       Pakistan.
 
While the value of the consideration to be received by Vanguard under the Plan
is uncertain, Vanguard does not believe that it is material.
 
     On January 22, 1999, a group of IWCH shareholders filed a complaint in the
Supreme Court of the State of New York (Warburg Dillon Read, et al. v. Vanguard
Cellular Systems, Inc., et al.) against Vanguard and certain of Vanguard's and
IWCH's directors and officers, alleging fraud and misrepresentation in
connection with the merger of Radio Movil Digital Americas into a subsidiary of
IWCH. The complaint seeks $81 million in compensatory damages and $325 million
in punitive
 
                                       37
<PAGE>   43
 
damages. The plaintiffs are former Radio Movil shareholders who received IWCH
Series I Preferred Stock as consideration in the merger.
 
     On December 16, 1998, another group of IWCH shareholders, who also were
formerly Radio Movil shareholders, filed a complaint in the U.S. District Court
for the District of Delaware (Loeb Partners Corp., et al. v. Griffin, et al.)
against present and former officers and directors of IWCH (including certain
present and former officers and directors of Vanguard), seeking damages in
excess of $3.5 million with respect to the Radio Movil transaction. In addition,
in the course of the Bankruptcy Case, certain other shareholders of IWCH or
their representatives have asserted that they have as yet unasserted claims
against Vanguard, certain of its officers and directors, and individual
directors of IWCH arising from events or transactions occurring during 1998
leading up to the September 1998 bankruptcy filing, and that they intend to
assert those claims at some later date.
 
     On March 15, 1999, a stipulation (the "STIPULATION") was agreed to among
Vanguard, certain bondholders of IWCH and IWCH in the Bankruptcy Case pursuant
to which, among other things:
 
     - a letter agreement of certain bondholders of IWCH committing them to
       support the Plan was extended until the earlier of consummation of the
       Plan or occurrence of certain events of default under the
       "debtor-in-possession" loan facility provided by Vanguard;
 
     - Vanguard agreed to pay $2,000,000 to IWCH on the earlier of the date of
       the mailing of the Proxy Statement or the termination of the Merger
       Agreement;
 
     - Vanguard agreed to reimburse certain expenses of IWCH incurred in
       connection with obtaining auditors' consents for SEC filings related to
       Vanguard and to indemnify IWCH and certain officers and directors of IWCH
       in connection therewith;
 
     - IWCH and its officers and directors and certain other parties were
       authorized and directed by the Bankruptcy Court to provide full
       cooperation, by among other things delivering representation letters to
       auditors, in connection with SEC filings related to Vanguard, including
       this Proxy Statement/Prospectus; and
 
     - certain modifications were made to the Plan, including the deletion of
       releases of Vanguard and its officers and directors from direct claims
       held by equity holders of IWCH for liability relating to IWCH.
 
     On March 19, 1999, the Bankruptcy Court approved the Stipulation.
 
     Litigation Concerning Star Digitel.  On March 16, 1999, Vanguard received a
letter from an attorney purporting to represent Star Digitel, in which he
threatened that Star Digitel would sue Vanguard, a Vanguard affiliate, and
Vanguard's chairman, based on purported failures to fulfill certain alleged
promises to raise funds for Star Digitel, to assist Star Digitel in finding a
strategic investment partner, and to assist Star Digitel in resolving disputes
with a commercial equipment supplier, and on unspecified other purported
violations of agreements involving Star Digitel and the Vanguard affiliate. The
letter asserts that the damages could exceed $500,000,000. Vanguard has been
informed that Star Digitel filed suit in federal district court in Los Angeles
on March 24, 1999, but as of March 25, 1999 Vanguard had not been served with a
complaint. Vanguard believes that the allegations of the March 16th letter are
without merit and intends to vigorously defend any such litigation.
 
                                       38
<PAGE>   44
 
                   RIGHTS OF DISSENTING VANGUARD SHAREHOLDERS
 
     Under Article 13 of the North Carolina Business Corporation Act, each
Vanguard shareholder is permitted to dissent from, and to obtain the fair value
of such Vanguard shareholder's Vanguard Shares in the event of the consummation
of, the Merger ("DISSENTERS' RIGHTS"). The following summary of Dissenters'
Rights under Article 13 does not purport to be complete and is subject in all
respects to the provisions of, and is qualified in its entirety by express
reference to, Article 13, a complete copy of which is attached as Appendix D to
this Proxy Statement/Prospectus and is incorporated herein by reference. Any
Vanguard shareholder who intends to dissent from the Merger should carefully
review the text and comply with the requirements of Article 13, as well as
consult with an attorney. FAILURE TO COMPLY WITH THE PROCEDURES PRESCRIBED BY
ARTICLE 13 WILL RESULT IN THE LOSS OF DISSENTERS' RIGHTS. Except as provided
below, no further notices will be given to Vanguard shareholders by Vanguard
regarding the existence of Dissenters' Rights or the time periods within which
or the procedures by which such Dissenters' Rights must be exercised.
 
     Any Vanguard shareholder who intends to dissent from the Merger must give
Vanguard, and Vanguard must actually receive, before a vote on the Merger
Proposal is taken at the Special Meeting, written notice of such Vanguard
shareholder's intent to demand payment for such Vanguard shareholder's
Dissenting Shares if the Merger is consummated. Any such notice should be mailed
to the Corporate Secretary of Vanguard at the following address: Vanguard
Cellular Systems, Inc., 2002 Pisgah Church Road, Greensboro, North Carolina
27455, Attention: Corporate Secretary. A vote against the Merger Proposal will
not be deemed to satisfy this notice requirement. A Vanguard shareholder who
provides such written notice, does not vote in favor of the Merger Proposal and
follows the other procedures in Article 13 will be entitled to receive the fair
value of such shareholder's Vanguard Shares in accordance with Article 13 and
not the Merger Consideration for such shareholder's Vanguard Shares. A Form of
Election will be disregarded if submitted by a holder of Dissenting Shares.
 
     In addition, a Vanguard shareholder dissenting from the Merger must not
vote such holder's Vanguard Shares in favor of the Merger Proposal, but must,
instead, either vote against or abstain from voting on the Merger Proposal.
Vanguard shareholders who return a signed proxy but fail to provide instructions
as to the manner in which such Vanguard Shares are to be voted will be deemed to
have voted in favor of the Merger Proposal and will not be entitled to assert
Dissenters' Rights. A Vanguard shareholder who dissents must dissent with
respect to all Vanguard Shares beneficially owned by such Vanguard shareholder.
 
     If the Merger is authorized by Vanguard shareholders at the Special Meeting
(or at any adjournments thereof), Vanguard must, no later than 10 days following
such Vanguard shareholder approval, send (by registered or certified mail,
return receipt requested) a written notice (the "DISSENTERS' NOTICE") to each
dissenting Vanguard shareholder who satisfies the requirements described in the
preceding two paragraphs. The Dissenters' Notice will:
 
     - state where the dissenting Vanguard shareholder's payment demand must be
       sent, and where and when certificates evidencing Vanguard Shares
       ("CERTIFICATES") must be deposited;
 
     - supply a form for demanding payment;
 
     - set a date by which Vanguard must receive the dissenting Vanguard
       shareholder's payment demand (which may not be fewer than 30 nor more
       than 60 days after the date the Dissenters' Notice is mailed); and
 
     - be accompanied by a copy of Article 13.
 
     Vanguard shareholders receiving the Dissenters' Notice must then demand
payment and deposit their Certificates in accordance with the terms of the
Dissenters' Notice to be entitled to Dissenters' Rights. Any Vanguard
shareholder who demands payment and deposits such Vanguard shareholder's
 
                                       39
<PAGE>   45
 
Certificates in accordance with Article 13 will retain all other rights as a
Vanguard shareholder until such rights are canceled or modified by consummation
of the Merger. A Vanguard shareholder who does not demand payment or deposit
such Vanguard shareholder's Certificates where required, each by the date set in
the Dissenters' Notice, will not be entitled to payment for such Vanguard
shareholder's Dissenting Shares under Article 13. If Vanguard does not
consummate the Merger within 60 days after the date set for demanding payment
and depositing Certificates in the Dissenters' Notice, Vanguard must return the
deposited Certificates. If the Merger is consummated thereafter, Vanguard must
send a new Dissenters' Notice and repeat the payment demand procedure described
above. Any holder of Dissenting Shares at the time of the Merger who thereafter
does not strictly follow the procedures described herein will receive in the
Merger the form of consideration receivable by shareholders making a
Non-Election. See "The Merger Agreement -- Conversion of Vanguard Shares".
 
     As soon as the Merger is consummated, Vanguard will be required to pay each
dissenting Vanguard shareholder who timely demanded payment and deposited such
shareholder's Certificates in accordance with the terms of the Dissenters'
Notice the amount that Vanguard estimates to be the fair value of such Vanguard
shareholder's Dissenting Shares, plus interest accrued from the Effective Date
to the date of payment. The payment will be accompanied by:
 
     - Vanguard's most recent year-end financial statements together with its
       most recent interim financial statements;
 
     - an explanation of how Vanguard estimated the fair value of the Dissenting
       Shares;
 
     - an explanation of how interest was calculated;
 
     - a statement of the dissenting Vanguard shareholder's right to demand
       payment if dissatisfied with the amount of Vanguard's payment; and
 
     - a copy of Article 13.
 
     If (1) a dissenting Vanguard shareholder believes that the amount paid by
Vanguard is less than the fair value of each holder's Dissenting Shares or that
the interest due is incorrectly calculated, (2) Vanguard fails to make payment
to a dissenting Vanguard shareholder as soon as the Merger is consummated or
within 30 days after receipt of a payment demand from the dissenting Vanguard
shareholder, or (3) Vanguard fails to consummate the Merger and does not return
the deposited Certificates within 60 days after the date set for demanding
payment, then such dissenting Vanguard shareholder may notify Vanguard in
writing of such dissenting Vanguard shareholder's own estimate of the fair value
of such dissenting Vanguard shareholder's Dissenting Shares and the amount of
interest due and may demand payment of the amount by which such estimate exceeds
the amount paid by Vanguard. This notice must be given within 30 days after
Vanguard makes payments or fails to perform. Any dissenting Vanguard shareholder
who does not give notice within such 30-day period will waive such shareholder's
Dissenters' Rights under Article 13 and will be deemed to have withdrawn such
Vanguard shareholder's dissent and demand for payment.
 
     If a dissenting Vanguard shareholder has taken all required actions and
such Vanguard shareholder's demand for payment remains unsettled, the dissenting
Vanguard shareholder may commence a proceeding within 60 days after the earlier
of the date Vanguard made payment for such shareholder's Dissenting Shares and
the date such dissenting Vanguard shareholder gives the notice described in the
immediately preceding paragraph by filing a complaint with the North Carolina
Superior Court Division of the General Court of Justice to determine the fair
value of such holder's Dissenting Shares and accrued interest. There is no right
to a jury trial in any such proceeding commenced by a Vanguard shareholder. A
dissenting Vanguard shareholder who takes no action within such 60-day period
shall be deemed to have withdrawn such Vanguard shareholder's dissent
 
                                       40
<PAGE>   46
 
and demand for payment. The court has discretion to make all dissenting Vanguard
shareholders whose demands remain unsettled parties to the proceeding, in which
case all parties must be served with a copy of the complaint. The court may
appoint one or more persons as appraisers with such powers as the court may
determine to receive evidence and recommend a decision on the question of fair
value. Each dissenting Vanguard shareholder made a party to the proceeding will
be entitled to judgment for the amount, if any, by which the court finds the
fair value of the Dissenting Shares, plus interest, to exceed the amount paid by
Vanguard. Court costs, as well as the fees and expenses of court-appointed
appraisers, counsel and experts, may be assessed by the court as it deems
equitable.
 
     For a discussion of certain tax consequences applicable to dissenting
Vanguard shareholders who receive cash upon the exercise of Dissenters' Rights,
see "The Merger -- Material Federal Income Tax Consequences."
 
                                       41
<PAGE>   47
 
                              THE MERGER AGREEMENT
 
     The following is a description of the material provisions of the Merger
Agreement, a copy of which is attached as Appendix A to this Proxy
Statement/Prospectus and incorporated herein by reference.
 
GENERAL
 
     Pursuant to the Merger Agreement, Vanguard will merge with and into Merger
Sub on the date and at the time that the Articles of Merger are filed with the
Secretary of State of the State of North Carolina in accordance with North
Carolina law and the Certificate of Merger is filed with the Secretary of State
of the State of Delaware in accordance with Delaware law (or such later time as
specified in the Articles of Merger and the Certificate of Merger). See "The
Merger -- Effective Time of the Merger." Upon the Merger, the separate corporate
existence of Vanguard will cease, and the internal corporate affairs of Merger
Sub, as the surviving corporation of the Merger, will continue to be governed by
the laws of the State of Delaware as well as the certificate of incorporation
and bylaws of Merger Sub.
 
     Pursuant to the Merger Agreement, the closing of the Merger will take place
at 8 a.m. on the first business day after the satisfaction or waiver of the
conditions to the Merger (the "CLOSING DATE"), provided that, if such conditions
are satisfied or waived upon completion of the Special Meeting, the closing will
take place within three to five business days thereafter. See "-- Conditions;
Waivers." The Closing Date may be delayed if (1) AT&T elects a later date
because, in its good faith judgment, AT&T believes such delay is necessary in
connection with avoiding interference with a material transaction (but such
delay may not extend beyond the date that is 12 or, under certain circumstances,
18 months from the date of the Merger Agreement) or (2) another time or date is
agreed to in writing by the parties to the Merger Agreement.
 
CONVERSION OF VANGUARD SHARES
 
     The Merger Agreement provides that, at the Effective Time, each issued and
outstanding Vanguard Share (other than Dissenting Shares and Vanguard-held
Shares) will be converted into the right to receive (1) the Per Share Stock
Amount of 0.3987 AT&T shares (which, as a result of the three-for-two stock
split, will be adjusted to 0.59805 AT&T shares), (2) the Per Share Cash Amount,
or (3) a combination of AT&T Shares and cash. As of the Effective Time, all
Vanguard Shares will no longer be outstanding and will automatically be canceled
and retired and will cease to exist, and each holder of a Certificate will cease
to have any rights with respect thereto, except the right to receive, upon
surrender of such Certificate, in accordance with the procedures set forth
herein, the Per Share Stock Amount, the Per Share Cash Amount or a combination
of cash and AT&T Shares. Vanguard Shares held by Vanguard or any wholly owned
subsidiary of Vanguard will be canceled without consideration.
 
     Election Generally.  Each record holder (or beneficial owner through
appropriate and customary documentation and instructions) will be entitled (1)
to elect to receive the Per Share Cash Amount for each such Vanguard Share (a
"CASH ELECTION"), (2) to elect to receive the Per Share Stock Amount for each
such Vanguard Share (a "STOCK ELECTION"), or (3) to indicate that such record
holder has no preference as to the receipt of cash or AT&T Shares with respect
to such holder's Vanguard Shares (a "NON-ELECTION," and any Cash Election, Stock
Election or Non-Election, an "ELECTION"). Mixed elections will not be permitted.
All Elections must be made on the Form of Election furnished in the green
envelope (or a facsimile thereof). If more than one Certificate is surrendered
for the account of the same holder, the number of AT&T Shares, if any, to be
issued to such holder in exchange for the Certificates that have been
surrendered will be computed on the basis of the aggregate number of Vanguard
Shares represented by all of the Certificates surrendered for the account of
such holder. Holders of record of Vanguard Shares who hold such Vanguard Shares
as
 
                                       42
<PAGE>   48
 
nominees, trustees or in other representative capacities (each, a
"REPRESENTATIVE") may submit multiple Forms of Election, provided that such
Representative certifies that each such Form of Election covers all Vanguard
Shares held by such Representative for a particular beneficial owner. A Vanguard
shareholder (other than a Representative) must elect to receive the same form of
Merger Consideration with respect to all Vanguard Shares held by or on behalf of
such holder. Any person or entity who beneficially owns Vanguard Shares must
instruct the Representatives that hold Vanguard Shares on behalf of such person
or entity to elect the same form of Merger Consideration for all Vanguard Shares
held on behalf of such person or entity.
 
     Limitations.  The aggregate number of Vanguard Shares that may be converted
into the right to receive cash in the Merger is equal to 50% of the number of
Vanguard Shares outstanding immediately prior to the Effective Time (other than
Dissenting Shares and Vanguard-held Shares). The aggregate number of Vanguard
Shares which may be converted into the right to receive AT&T Shares in the
Merger is equal to 50% of the number of such Vanguard Shares outstanding
immediately prior to the Effective Time. Because Dissenting Shares are excluded
for purposes of calculating these limitations, any Form of Election submitted by
a holder of Dissenting Shares will be ignored. Any such calculations will be
made as of shortly before the Merger.
 
     Cash Oversubscription.  If the aggregate number of Vanguard Shares with
respect to which Cash Elections have been made exceeds the aggregate number of
Vanguard Shares that may be converted into the right to receive cash in the
Merger, then:
 
     - each Vanguard Share with respect to which a Stock Election was made will
       be converted into the right to receive the Per Share Stock Amount;
 
     - each Vanguard Share with respect to which a Non-Election was made (or
       deemed to have been made) will be converted into the right to receive the
       Per Share Stock Amount; and
 
     - each Vanguard Share with respect to which a Cash Election was made will
       be converted into the right to receive (1) the amount in cash, without
       interest, equal to the product of (a) the Per Share Cash Amount and (b) a
       fraction, the numerator of which will be the aggregate number of Vanguard
       Shares that may be converted into the right to receive cash in the
       Merger, and the denominator of which will be the aggregate number of
       Vanguard Shares with respect to which Cash Elections were made (the "CASH
       FRACTION"), and (2) the number of AT&T Shares equal to the product of (a)
       the Per Share Stock Amount and (b) a fraction equal to one minus the Cash
       Fraction.
 
     Stock Oversubscription.  If the aggregate number of Vanguard Shares with
respect to which Stock Elections have been made exceeds the aggregate number of
Vanguard Shares which may be converted into the right to receive AT&T Shares in
the Merger, then:
 
     - each Vanguard Share with respect to which a Cash Election was made will
       be converted into the right to receive the Per Share Cash Amount;
 
     - each Vanguard Share with respect to which a Non-Election was made (or
       deemed to have been made) will be converted into the right to receive the
       Per Share Cash Amount; and
 
     - each Vanguard Share with respect to which a Stock Election was made will
       be converted into the right to receive (1) the number of AT&T Shares
       equal to the product of (a) the Per Share Stock Amount and (b) a
       fraction, the numerator of which will be the aggregate number of Vanguard
       Shares which may be converted into the right to receive AT&T Shares in
       the Merger, and the denominator of which will be the aggregate number of
       Vanguard Shares with respect to which Stock Elections were made (the
       "STOCK FRACTION"), and (2) the amount in cash, without interest, equal to
       the product of (a) the Per Share Cash Amount and (b) a fraction equal to
       one minus the Stock Fraction.
 
                                       43
<PAGE>   49
 
     No Oversubscription.  If there is neither a cash oversubscription nor a
stock oversubscription, then:
 
     - each Vanguard Share with respect to which a Cash Election was made (or
       deemed to have been made) will be converted into the right to receive the
       Per Share Cash Amount;
 
     - each Vanguard Share with respect to which a Stock Election was made (or
       deemed to have been made) will be converted into the right to receive the
       Per Share Stock Amount; and
 
     - each Vanguard Share with respect to which a Non-Election was made (or
       deemed to have been made), if any, will be converted into the right to
       receive (1) the amount in cash, without interest, equal to the product of
       (a) the Per Share Cash Amount and (b) a fraction, the numerator of which
       will be the excess of (x) the aggregate number of Vanguard Shares which
       may be converted into the right to receive cash in the Merger over (y)
       the aggregate number of Vanguard Shares with respect to which a Cash
       Election was made, and the denominator of which will be the excess of (x)
       the aggregate number of Vanguard Shares outstanding immediately prior to
       the Effective Time (other than Vanguard Shares held by Vanguard or any
       wholly owned subsidiary of Vanguard) over (y) the sum of the aggregate
       number of Vanguard Shares with respect to which a Cash Election or a
       Stock Election was made plus Dissenting Shares (the "NON-ELECTION
       FRACTION"), and (2) the number of AT&T Shares equal to the product of (a)
       the Per Share Stock Amount and (b) a fraction equal to one minus the
       Non-Election Fraction.
 
     Potential Value Fluctuation of Merger Consideration.  The value of the
consideration that a Vanguard shareholder receives in the Merger may depend on
the value of AT&T Shares, which will fluctuate, as well as on the percentage of
Vanguard shareholders that elect to receive AT&T Shares versus cash in the
Merger. Since the value of the cash portion of the Merger Consideration is fixed
at $23.00, it is expected that, if the value of 0.3987 pre-split AT&T Shares
exceeds $23.00 (which will occur if the market value of an AT&T Share is more
than $57.70), holders of more than 50% of the Vanguard Shares will elect to
receive AT&T Shares in the Merger and, consequently, those Vanguard shareholders
that elect to receive AT&T Shares will receive a combination of AT&T Shares and
cash in respect of each Vanguard Share. The 0.3987 exchange ratio used in the
example above does not take account of AT&T's three-for-two stock split. Under
the same example on a post-split basis, it is expected that if the value of
0.59805 post-split AT&T Shares exceeds $38.47, holders of more than 50% of the
Vanguard Shares will elect to receive AT&T Shares in the Merger.
 
                                       44
<PAGE>   50
 
     The following table illustrates the approximate value of the consideration
that a Vanguard shareholder with 100 Vanguard Shares, depending on whether such
shareholder makes a stock election or a cash election, receives assuming varying
values for AT&T Shares and different percentages of Vanguard shareholders
electing to receive AT&T Shares (and assuming no Dissenting Shares). The table
uses hypothetical pre-split share prices and the pre-split exchange ratio of
0.3987. You should bear in mind that, notwithstanding the foregoing, (1) the
price of AT&T Shares is subject to change, and (2) neither AT&T nor Vanguard can
predict the percentage of Vanguard shareholders that will make stock elections
or cash elections.
 
<TABLE>
<S>                                    <C>       <C>       <C>       <C>       <C>       <C>
                                       If the value of an AT&T share (on a pre-split basis) is:
                                       $78.00    $83.00    $88.00    $78.00    $83.00    $88.00
                                       then the approximate value of the aggregate merger
                                       consideration that a holder of 100 Vanguard Shares
                                       receives will be:
  and stock elections are made for:      if such holder makes a        if such holder makes a
                                             stock election                cash election
          all Vanguard Shares          $2,705    $2,805    $2,904       n/a       n/a       n/a
          75% of the Vanguard Shares   $2,840    $2,973    $3,106    $2,300    $2,300    $2,300
          50% of the Vanguard Shares   $3,110    $3,309    $3,509    $2,300    $2,300    $2,300
          25% of the Vanguard Shares   $3,110    $3,309    $3,509    $2,570    $2,636    $2,703
          no Vanguard Shares              n/a       n/a       n/a    $2,705    $2,805    $2,904
</TABLE>
 
     No Fractional Shares.  No certificate or scrip representing fractional AT&T
Shares will be issued upon the surrender for exchange of Certificates, and such
fractional AT&T Share interests will not entitle the owner thereof to vote or to
any other rights of a shareholder of AT&T. Each holder of Vanguard Shares
exchanged pursuant to the Merger who would otherwise have been entitled to
receive a fraction of an AT&T Share (after taking into account all Certificates
delivered by such holder) will receive, in lieu thereof, cash (without interest)
in an amount equal to such fraction of an AT&T Share multiplied by $23.00.
 
     Adjustment to Per Share Stock Amount.  In the event that, pursuant to a
transaction announced after the date of the Merger Agreement and becoming
effective prior to the Effective Time, (1) any distribution is made in respect
of AT&T Shares other than a regular quarterly cash dividend or (2) any stock
dividend, stock split, reclassification, recapitalization, combination or
mandatory exchange of shares occurs with respect to, or rights (other than
non-mandatory offers to exchange) are issued in respect of, AT&T Shares, then,
the Per Share Stock Amount will be adjusted accordingly. As a result of the
three-for-two stock split of AT&T Shares which was announced after the date of
the Merger Agreement and will be paid prior to the Effective Time, the Per Share
Stock Amount will be adjusted from 0.3987 to 0.59805 AT&T Shares.
 
     Election Procedure; Exchange of Certificates.  A green Form of Election is
being sent contemporaneously to Vanguard shareholders in a separate mailing.
Elections may be made by holders of Vanguard Shares by delivering the green Form
of Election to Boston Equiserve Trust Company, N.A. (the "EXCHANGE AGENT"). To
be effective, a green Form of Election must be properly completed, signed and
submitted in the green return envelope mailed therewith to the Exchange Agent by
no later than 5:00 p.m., Eastern Time, on April 26, 1999 (the "ELECTION
DEADLINE"), and accompanied by (a) the Certificates as to which the Election is
being made or (b) an appropriate guarantee of delivery of such Certificates as
set forth in such green Form of Election from a firm that is a member of a
registered national securities exchange or of the National Association of
Securities Dealers, Inc., or a commercial bank or trust company having an office
or correspondent in the United States, provided that such Certificates are in
fact delivered to the Exchange Agent within three NYSE trading days after the
date of execution of such guarantee of delivery (a "GUARANTEE OF
 
                                       45
<PAGE>   51
 
DELIVERY"). Failure to deliver Certificates covered by any Guarantee of Delivery
within three NYSE trading days after the date of execution of such Guarantee of
Delivery will be deemed to invalidate any otherwise properly made Cash Election
or Stock Election. AT&T has the discretion, which it may delegate in whole or in
part to the Exchange Agent, to determine whether any Form of Election has been
properly completed, signed and submitted or revoked and to disregard immaterial
defects in the Form of Election. The good faith decision of AT&T (or, if so
delegated, the Exchange Agent) in such matters will be conclusive and binding.
Neither AT&T nor the Exchange Agent is under any obligation to notify any person
of any defect in a Form of Election submitted to the Exchange Agent. The
Exchange Agent will also make all computations contemplated by the Merger
Agreement, and all such computations will be conclusive and binding on the
holders of Vanguard Shares in the absence of manifest error. Any Form of
Election may be changed or revoked prior to the Election Deadline. In the event
a Form of Election is revoked prior to the Election Deadline, AT&T will, or will
cause the Exchange Agent to, cause the Certificates covered by such Form of
Election to be promptly returned without charge to the person submitting the
Form of Election upon written request to that effect from such person. A Form of
Election and Letter of Transmittal may be changed if the record holder
effectively revokes such holder's Form of Election and Letter of Transmittal in
accordance with the procedures described herein and a new Form of Election and
Letter of Transmittal and the related Vanguard Share Certificate(s) (or a
Guarantee of Delivery) for such record holder is received by the Exchange Agent
at or prior to the Election Deadline. Vanguard shareholders who do wish to
revoke and resubmit should take into account the time required to receive and
resubmit Certificates, which may or may not be sufficient to allow for the
receipt of returned Certificates and the resubmission of Certificates by the
applicable deadline.
 
     A Vanguard shareholder who does not submit a Form of Election to the
Exchange Agent prior to the Election Deadline (including a holder who submits
and then revokes such shareholder's Form of Election and does not re-submit a
Form of Election and other required documents that are timely received by the
Exchange Agent), or who submits a Form of Election without the corresponding
Certificates or a Guarantee of Delivery, will be deemed to have made a
Non-Election. If any Form of Election is defective in any manner such that the
Exchange Agent cannot reasonably determine the election preference of the
Vanguard shareholder submitting such Form of Election, the purported Cash
Election or Stock Election set forth therein will be deemed to be of no force
and effect, and the Vanguard shareholder making such purported Cash Election or
Stock Election will be deemed to have made a Non-Election.
 
     If Vanguard and AT&T do not expect to consummate the Merger within three to
five business days after the Special Meeting, they will extend the Election
Deadline and publicly announce the extension. In any event, Vanguard and AT&T
intend to mail, approximately 10 days prior to the ultimate deadline for making
Elections, Forms of Election to persons who have become Vanguard shareholders
following the Record Date. Forms of Election are also available from D.F. King &
Co. upon request.
 
     Other.  All AT&T Shares issued upon the surrender for exchange of
Certificates in accordance with the terms of the Merger Agreement (including any
cash paid) will be deemed to have been issued in full satisfaction of all rights
pertaining to such Vanguard Shares, and, from and after the Effective Time,
there will be no further registration of transfers of Vanguard Shares that were
outstanding immediately prior to the Effective Time. If, after the Effective
Time, Certificates are presented to the Merger Sub for any reason, they will be
canceled and exchanged.
 
     Holders of Dissenting Shares will not be entitled to receive the Merger
Consideration otherwise applicable thereto, and any Form of Election submitted
by such holders will be ignored. Such shareholders will be entitled to receive
the amounts determined in accordance with the provisions of Article 13. If,
after the Effective Time, any such holder fails to preserve such rights, such
Dissenting
 
                                       46
<PAGE>   52
 
Shares will then be deemed to have been converted into and to have become
exchangeable for, as of the Effective Time, the right to receive, without any
interest thereon, the consideration provided for in the Merger Agreement with
the making of a Non-Election. Vanguard will give AT&T prompt notice of any
notice or demands for payment in accordance with Article 13 for Vanguard Shares
received by Vanguard, and AT&T shall have the right to direct all proceedings,
negotiations and actions taken by Vanguard in respect thereof.
 
     At the Effective Time, each unexpired and unexercised outstanding Option
will be canceled and converted into the right to receive from AT&T, within 10
days following the Effective Time, cash in an amount equal to the product of (1)
the Per Share Cash Amount minus the exercise price per share of such Option,
times (2) the number of Vanguard Shares that may be purchased upon exercise of
such Option (whether or not then exercisable). Prior to (but effective at) the
Effective Time, Vanguard will use its reasonable best efforts to (a) obtain any
consents from all holders of Options and (b) make any amendments to the terms of
such Options or compensation plans or arrangements that, in the case of either
clause (a) or (b) of this sentence, are necessary to give effect to the
transactions in connection with the Options. Immediately prior to the Effective
Time, Vanguard will terminate the Vanguard Stock Option Plans effective as of
the Effective Time.
 
     No dividends or other distributions declared or made after the Effective
Time with respect to AT&T Shares with a record date after the Effective Time
will be paid to the holder of any unsurrendered Certificate with respect to the
AT&T Shares to which such holder is entitled in the Merger and no cash payment
will be paid to any such holder until the holder of record of such Certificate
surrenders such Certificate. Subject to the effect of applicable laws, following
surrender of any such Certificate, there will be given to the record holder of
the Certificates representing whole AT&T Shares to which such holder is entitled
hereunder, without interest, (1) at the time of such surrender, a Certificate
representing the number of whole AT&T Shares and the amount of any cash to which
such holder is entitled and the amount of dividends or other distributions with
respect to such whole AT&T Shares with a record date after the Effective Time
and a payment date prior to their date of issuance to such holder, and (2) at
the appropriate payment date, the amount of dividends or other distributions
with a record date after the Effective Time but prior to surrender and a payment
date subsequent to surrender payable with respect to such whole AT&T Shares.
 
     If any Certificate is lost, stolen or destroyed, upon the making of an
affidavit of that fact by the person claiming such Certificate to be lost,
stolen or destroyed and, if required by AT&T, the posting by such person of a
bond in such reasonable amount as AT&T may direct as indemnity against any claim
that may be made against it with respect to such Certificate, the Exchange Agent
will deliver, in exchange for such lost, stolen or destroyed Certificate, AT&T
Shares and/or any cash.
 
     At 5:00 p.m., Eastern Time, on the day the Effective Time occurs, the stock
transfer books of Vanguard will be closed and there will be no further
registration of transfers of Vanguard Shares thereafter on the records of
Vanguard. From and after the Effective Time, holders of Certificates will cease
to have any rights with respect to Vanguard Shares formerly represented thereby,
except as otherwise provided in the Merger Agreement or by law. On or after the
Effective Time, any Certificates presented to the Exchange Agent or AT&T for any
reason will be converted into the Merger Consideration applicable to each
Vanguard Share formerly represented thereby.
 
REPRESENTATIONS AND WARRANTIES
 
     The Merger Agreement contains various representations and warranties of the
parties thereto customary for transactions of such type, including
representations and warranties by Vanguard as to:
 
     - organization, standing and power;
 
     - capital structure;
 
                                       47
<PAGE>   53
 
     - authority and no conflicts as to the Merger Agreement;
 
     - reports and financial statements;
 
     - this Proxy Statement/Prospectus and the related Registration Statement;
 
     - compliance with applicable laws and regulatory matters;
 
     - litigation;
 
     - taxes;
 
     - absence of certain changes or events;
 
     - vote required to approve the Merger Agreement;
 
     - material contracts and agreements;
 
     - employee benefit plans, labor matters and options;
 
     - brokers or finders;
 
     - opinion of financial advisor;
 
     - Year 2000 compliance;
 
     - affiliated transactions and certain other agreements;
 
     - environmental matters;
 
     - intellectual property;
 
     - properties;
 
     - assets;
 
     - insurance;
 
     - foreign operations; and
 
     - the Tender Offer;
 
and by AT&T and Merger Sub as to:
 
     - organization, standing and power;
 
     - authorization and execution of the Merger Agreement;
 
     - AT&T Shares;
 
     - no conflicts as to the Merger Agreement;
 
     - reports and financial statements;
 
     - this Proxy Statement/Prospectus and the related Registration Statement;
 
     - absence of certain changes or events;
 
     - no vote required by AT&T shareholders to approve the Merger Agreement;
 
     - brokers or finders;
 
     - ownership of Vanguard Shares; and
 
     - business activities of Merger Sub.
 
                                       48
<PAGE>   54
 
BUSINESS OF VANGUARD PENDING THE MERGER
 
     During the period from the date of the Merger Agreement and continuing
until the Effective Date, Vanguard and its subsidiaries have agreed to carry on
their respective businesses in the usual, regular and ordinary course in all
material respects, in substantially the same manner, and will use reasonable
best efforts to preserve their relationships with employees. In addition,
Vanguard has agreed to certain customary restrictions for the conduct of its
business with regard to:
 
     - dividends and changes in share capital;
 
     - securities;
 
     - organizational documents and funding;
 
     - investments and loans;
 
     - compensation;
 
     - extraordinary transactions;
 
     - acquisitions and other uses of funds;
 
     - wireless assets;
 
     - line of business;
 
     - expenditures;
 
     - affiliates;
 
     - claims;
 
     - non-competition agreements;
 
     - tax and accounting matters; and
 
     - certain other actions.
 
REASONABLE EFFORTS
 
     Each of Vanguard and AT&T and their respective subsidiaries has agreed to
use its reasonable commercial efforts to effectuate the transactions
contemplated by the Merger Agreement and to cause to be fulfilled the conditions
to closing under the Merger Agreement, and Vanguard has agreed to use its
commercially reasonable efforts to comply with and to effectuate the Voting
Agreements and the Vanguard Option Agreement. Notwithstanding the foregoing or
anything in the Merger Agreement to the contrary:
 
     - neither Vanguard nor any of its subsidiaries will, without AT&T's prior
       written consent, commit to any divestiture or similar transaction, and
       each of Vanguard and its subsidiaries will commit to, and will use
       reasonable efforts to effect any such transaction (which may, at
       Vanguard's option, be conditioned upon and effective as of the Effective
       Time) as AT&T shall request;
 
     - neither AT&T or any of its subsidiaries will be required to divest or
       hold separate or otherwise take (or refrain from taking) or commit to
       take (or refrain from taking) any action that limits its freedom of
       action with respect to, or its ability to retain, Vanguard or any of its
       subsidiaries or any material portion of the assets of Vanguard and its
       subsidiaries, or any of the business, product lines or assets of AT&T or
       any of its subsidiaries, except (a) AT&T will take such action with
       respect to PCS spectrum in Vanguard's geographic cellular service areas
       as is required to comply with the FCC's spectrum aggregation rules and
       policies or will obtain a timely waiver of such rules and policies and
       (b) any such divestiture, requirement to hold
 
                                       49
<PAGE>   55
 
       separate, or limitation that arises after AT&T or any of its subsidiaries
       engages in, or agrees to engage in, a merger, acquisition or other
       business combination transaction after the date of the Merger Agreement
       (and that has not been publicly announced prior to the date of the Merger
       Agreement), but that would not have arisen but for AT&T engaging in or
       agreeing to engage in such transaction; and
 
     - nothing in the Merger Agreement will prevent or restrict AT&T and its
       subsidiaries from engaging in any merger, acquisition or business
       combination transaction; provided that such merger, acquisition or
       business combination transaction would not (a) prevent, or delay beyond
       the date that is 12 or, under certain circumstances, 18 months from the
       date of the Merger Agreement the ability of AT&T to consummate, the
       Merger or (b) cause the Merger to fail to qualify as a "reorganization"
       within the meaning of Section 368(a) of the Code.
 
NO SOLICITATION
 
     Vanguard has agreed that Vanguard and its subsidiaries, officers,
directors, employees, agents and representatives (including any investment
banker, attorney or accountant retained by it) will not, directly or indirectly,
initiate, solicit, encourage or otherwise facilitate any inquiries or the making
of any proposal or offer with respect to a merger, reorganization, share
exchange, consolidation, business combination, recapitalization, liquidation,
dissolution or similar transaction involving, or any purchase of any substantial
portion of the assets of, or any equity securities of, or any transaction that
would involve the transfer or potential transfer of control of, Vanguard (any
such proposal or offer, an "ACQUISITION PROPOSAL"), and has represented that it
has terminated any discussions or negotiations with, and the provision of
information or data to, any person (other than AT&T) respecting an Acquisition
Proposal. Vanguard has further agreed that Vanguard and its subsidiaries,
officers, directors, employees, agents and representatives (including any
investment banker, attorney or accountant retained by it) will not, directly or
indirectly, provide any confidential information or data to any person relating
to or in contemplation of an Acquisition Proposal or engage in any negotiations
or discussions relating to or in contemplation of an Acquisition Proposal.
However, nothing contained in the Merger Agreement will prevent Vanguard or the
Vanguard Board from complying with Rule 14e-2 promulgated under the Securities
and Exchange Act of 1934, as amended, with regard to any Acquisition Proposal.
 
     In addition, if and only to the extent that the Vanguard Board concludes in
good faith (after having consulted with and considered the advice of outside
legal counsel) that such Acquisition Proposal would, if consummated, result in a
transaction more favorable to Vanguard shareholders from a financial point of
view than the transactions contemplated by the Merger Agreement (any such more
favorable Acquisition Proposal, a "SUPERIOR PROPOSAL"), and until the approval
of Vanguard shareholders has been obtained, Vanguard may furnish or cause to be
furnished confidential information or data and may participate in such
negotiations and discussions, but only if:
 
     - Vanguard is not then in breach of its obligations described in this
       paragraph and the preceding paragraph; and
 
     - only to the extent that the Vanguard Board concludes in good faith (after
       having consulted with and considered the advice of outside legal counsel)
       that such action is necessary in order for its directors to comply with
       their respective fiduciary duties under applicable law; and
 
     - confidentiality arrangements on terms no less beneficial to Vanguard as
       those entered into by AT&T are entered into with respect thereto.
 
Vanguard has agreed to notify AT&T immediately if any inquiries, proposals or
offers respecting an Acquisition Proposal are received by, any such information
or data is requested from, or any such discussions or negotiations are sought to
be initiated or continued with, it or any such persons
 
                                       50
<PAGE>   56
 
indicating, in connection with such notice, the name of such person and the
material terms and conditions of any proposals or offers, and must keep AT&T
apprised with respect to the status and terms thereof. Vanguard has also agreed
to promptly request each person that had, prior to the Merger Agreement,
executed a confidentiality agreement in connection with its consideration of an
Acquisition Proposal return all confidential information furnished to such
person by or on behalf of Vanguard and may not waive any "standstill" provision
of any such, or any other, agreement. Vanguard has agreed to provide AT&T at
least two business days' advance notice of its intention to present to the
Vanguard Board or accept any Superior Proposal and to provide AT&T with a
summary of the terms and conditions thereof.
 
SPECIAL MEETING; RECOMMENDATION
 
     Pursuant to the Merger Agreement, Vanguard has agreed, as soon as
practicable following the date of the Merger Agreement, to duly call, give
notice of, convene and hold the Special Meeting for the purpose of obtaining
shareholder approval of the Merger Proposal and that the Vanguard Board will
unanimously recommend such approval by Vanguard shareholders and, upon AT&T's
request, reconfirm such recommendation, provided that the Vanguard Board need
not:
 
     - make or reconfirm such recommendation (a) if, at the time that it would
       otherwise be required to make or reconfirm such recommendation, Vanguard
       is not then in breach of its obligations described under "-- No
       Solicitation," and (b) in such event, if and only to the extent that the
       Vanguard Board concludes in good faith (after having consulted with and
       considered the advice of outside legal counsel) in connection with the
       receipt of a Superior Proposal that such action is necessary in order for
       its directors to comply with their respective fiduciary duties under
       applicable law; or
 
     - reconfirm such recommendation if no other Acquisition Proposal is pending
       or, in AT&T's reasonable judgment, likely to become pending.
 
CONDITIONS; WAIVERS
 
     Conditions to Each Party's Obligations to Effect the Merger.  The
obligations of Vanguard, AT&T and Merger Sub to effect the Merger are subject to
the satisfaction, or waiver (other than with respect to the condition to receive
tax opinions, which is non-waivable) by the party benefited by the condition
waived, on the Closing Date of the following conditions:
 
     - Vanguard having obtained the Required Vanguard Vote;
 
     - the waiting period (and any extension thereof) applicable to the Merger
       under the Hart-Scott-Rodino Antitrust Improvements Act having been
       terminated or expired;
 
     - no temporary restraining order, preliminary or permanent injunction or
       other order issued by a court or other governmental entity of competent
       jurisdiction being in effect and having the effect of making the Merger
       illegal or otherwise prohibiting consummation of the Merger;
 
     - the Registration Statement having become effective under the Securities
       Act and not being the subject of any stop order or proceedings seeking a
       stop order;
 
     - this Proxy Statement/Prospectus having been delivered to the Vanguard
       shareholders in accordance with the requirements of the Securities Act
       and the Exchange Act;
 
     - Vanguard having received the opinion of Latham & Watkins and AT&T having
       received the opinion of Wachtell, Lipton, Rosen & Katz, which opinions
       shall be dated as of the Closing Date, that the Merger will be treated
       for U.S. federal income tax purposes as a "reorganization" within the
       meaning of Section 368(a) of the Code; and
 
     - the AT&T Shares to be issued in the Merger having been approved for
       listing on the NYSE, subject to official notice of issuance.
 
                                       51
<PAGE>   57
 
     Conditions to the Obligations of AT&T and Merger Sub.  The obligations of
AT&T and Merger Sub to effect the Merger are subject to the satisfaction, or
waiver by AT&T, on the Closing Date, of the following conditions:
 
     - (a) each of the representations and warranties of Vanguard set forth in
       the Merger Agreement that is qualified as to materiality or material
       adverse effect being true and correct when made and being true and
       correct on and as of the Closing Date as if made on and as of such date
       (other than representations and warranties which address matters only as
       of a certain date which must be true and correct as of such certain
       date), (b) each of the representations and warranties of Vanguard that is
       not so qualified being true and correct in all material respects when
       made and being true and correct in all material respects on and as of the
       Closing Date as if made on and as of such date (other than
       representations and warranties which address matters only as of a certain
       date that must be true and correct in all material respects as of such
       certain date), (c) each of the representations and warranties of Vanguard
       set forth in the Merger Agreement being true and correct when made and
       being true and correct on and as of the Closing Date (ignoring, for such
       purposes, any qualification as to materiality, material adverse effect or
       similar language), except as could not, individually or in the aggregate
       with all other failures to be true and correct, reasonably be expected to
       have a material adverse effect on Vanguard and (d) AT&T and Merger Sub
       will have received a certificate of the chief executive officer and the
       chief financial officer of Vanguard to such effect;
 
     - Vanguard having performed or complied with all agreements and covenants
       required to be performed by it under the Merger Agreement at or prior to
       the Closing Date that are qualified as to materiality or material adverse
       effect and having performed or complied in all material respects with all
       agreements and covenants required to be performed by it under the Merger
       Agreement at or prior to the Closing Date that are not so qualified as to
       materiality or material adverse effect, and AT&T and Merger Sub having
       received a certificate of the chief executive officer and the chief
       financial officer of Vanguard to such effect;
 
     - all (a) specifically required consents and (b) other consents of any
       person the failure of which to receive or obtain (individually or on the
       aggregate) could reasonably be expected to have a material adverse effect
       on Vanguard having been obtained or given, in each case at not more than
       immaterial cost and expense to Vanguard and AT&T and with not more than
       immaterial alteration of rights or obligations of Vanguard or any of its
       subsidiaries under any agreement, arrangement or instrument;
 
     - the number of Dissenting Shares not exceeding 5% of the number of
       outstanding Vanguard Shares;
 
     - all authorizations, consents, orders and approvals of, and declarations
       and filings with, and all expirations of waiting periods imposed by, any
       governmental entity (other than the FCC or the appropriate governmental
       entity under the Hart-Scott-Rodino Antitrust Improvements Act) that, if
       not obtained in connection with the consummation of the transactions
       contemplated hereby, could reasonably be expected to have a material
       adverse effect on AT&T or Vanguard (collectively, "VANGUARD REQUIRED
       REGULATORY APPROVALS"), having been obtained, declared or filed or having
       occurred, as the case may be, and all such Vanguard Required Regulatory
       Approvals being in full force and effect and not having any term,
       condition or restriction unacceptable to AT&T in its sole discretion;
 
     - the FCC having granted its consent to the consummation of the
       transactions contemplated by the Merger Agreement, such FCC consents
       having become a final order of the FCC and being in full force and
       effect, and such FCC consents not having any term, condition or
       restriction unacceptable to AT&T in its sole discretion (subject to
       certain limitations);
 
                                       52
<PAGE>   58
 
     - AT&T having received an affiliate letter from each person who may be
       deemed to be an affiliate of Vanguard;
 
     - since the date of the Merger Agreement, there not having been any event,
       development or change of circumstance that constitutes, has had, or could
       reasonably be expected to have, individually or in the aggregate, a
       material adverse effect on Vanguard;
 
     - no suit, action, investigation or other proceeding by any governmental
       entity having been instituted and being pending that imposes, seeks to
       impose or reasonably would be expected to impose any remedy, condition or
       restriction that would have a material adverse effect on Vanguard or that
       would materially restrict AT&T's ownership or operation of Vanguard; and
 
     - either (a) all Debentures having been covenant defeased (and all
       conditions thereto satisfied) in accordance with the covenant defeasance
       provisions of Sections 6.1 and 6.1A of the Indenture or (b) the Proposed
       Amendments having become effective and the provisions thereof having
       become operative and substantially all of the covenants in the Indenture
       no longer applying to or restricting the operation of Vanguard and its
       successors.
 
     Conditions to the Obligations of Vanguard.  The obligations of Vanguard to
effect the Merger are subject to the satisfaction, or waiver by Vanguard, on or
prior to the Closing Date, of the following conditions:
 
     - (a) each of the representations and warranties of AT&T and Merger Sub set
       forth in the Merger Agreement that is qualified as to materiality or
       material adverse effect being true and correct when made and being true
       and correct on and as of the Closing Date as if made on and as of such
       date (other than representations and warranties which address matters
       only as of a certain date that must be true and correct as of such
       certain date), (b) each of the representations and warranties of each of
       AT&T and Merger Sub that is not so qualified being true and correct in
       all material respects when made and being true and correct in all
       material respects on and as of the Closing Date as if made on and as of
       such date (other than representations and warranties that address matters
       only as of a certain date must be true and correct in all material
       respects as of such certain date) and (c) Vanguard having received a
       certificate of an executive officer of AT&T to such effect;
 
     - AT&T having performed or complied with all agreements and covenants
       required to be performed by it under the Merger Agreement at or prior to
       the Closing Date that are qualified as to materiality or material adverse
       effect and having performed or complied in all material respects with all
       agreements and covenants required to be performed by it under the Merger
       Agreement at or prior to the Closing Date that are not so qualified as to
       materiality, and Vanguard having received a certificate of an executive
       officer of AT&T to such effect; and
 
     - all authorizations, consents, orders and approvals of, and declarations
       and filings with, and all expirations of waiting periods imposed by, any
       governmental entity (other than the FCC or the appropriate governmental
       entity under the Hart-Scott-Rodino Antitrust Improvements Act) that, if
       not obtained in connection with the consummation of the transactions
       contemplated hereby, could reasonably be expected to have a material
       adverse effect on AT&T (collectively, "AT&T REQUIRED REGULATORY
       APPROVALS"), having been obtained, having been declared or filed or
       having occurred, as the case may be, and all such AT&T Required
       Regulatory Approvals being in full force and effect.
 
     Except as set forth in this paragraph, each of the foregoing conditions is
waivable by AT&T or Vanguard, as the case may be, to the extent legally
permissible. AT&T and Vanguard will not complete the Merger without the Required
Vanguard Vote, FCC consent, expiration of the waiting period under the
Hart-Scott-Rodino Antitrust Improvements Act and effectiveness of the
Registration Statement. In addition, the condition to receive tax opinions is a
non-waivable condition to the Merger.
 
                                       53
<PAGE>   59
 
TERMINATION
 
     Termination by Either AT&T or Vanguard.  The Merger Agreement may be
terminated at any time prior to the Effective Time, by action taken or
authorized by the Board of Directors of the terminating party or parties,
whether before or after approval of the Merger Proposal by Vanguard
shareholders:
 
     (1) by the mutual written consent of AT&T and Vanguard, by action of their
         respective Boards of Directors;
 
     (2) if the Merger has not been consummated by the date which is 12 months
         from the date of the Merger Agreement, provided that this date will be
         extended by six months in the event that all conditions to effect the
         Merger other than (a) the termination or expiration of the
         Hart-Scott-Rodino Antitrust Improvements Act waiting period, (b) the
         lack of injunctions or restraints, (c) the lack of necessary consents,
         (d) the existence of Dissenting Shares in a number greater than 5% of
         the outstanding Vanguard Shares, (e) the lack of Vanguard Required
         Regulatory Approvals or AT&T Required Regulatory Approvals, (f) the
         lack of FCC consent and (g) the existence of suits or actions by a
         governmental entity (collectively, the "EXTENSION CONDITIONS") have
         been or are capable of being satisfied at the time of such extension
         and the Extension Conditions have been or are reasonably capable of
         being satisfied on or prior to the date that is 18 months from the date
         of the Merger Agreement (as such date may be extended, the "OUTSIDE
         DATE"), and, provided further, that the right to terminate the Merger
         Agreement described under this clause (2) will not be available to any
         party whose failure to fulfill any obligation under the Merger
         Agreement has been the cause of, or resulting in, the failure of the
         Merger to occur on or before such date;
 
     (3) if any governmental entity has issued an order, decree or ruling or
         taken any other action permanently restraining, enjoining or otherwise
         prohibiting the transactions contemplated by the Merger Agreement, and
         such order, decree, ruling or other action shall have become final and
         nonappealable; or
 
     (4) if the approval by Vanguard shareholders of the Merger Proposal has not
         been obtained by reason of the failure to obtain the Required Vanguard
         Vote at the Special Meeting or at any adjournment thereof.
 
     Termination by AT&T.  The Merger Agreement may be terminated at any time
prior to the Effective Time, by action taken or authorized by the AT&T Board,
whether before or after approval of the Merger Proposal by Vanguard
shareholders, if:
 
     (1) (a) the Vanguard Board has withdrawn, or adversely modified, or failed
         (upon AT&T's request) to reconfirm its recommendation of the Merger or
         the Merger Agreement (or determined to do so), (b) the Vanguard Board
         has determined to recommend to the Vanguard shareholders that they
         approve an Acquisition Proposal other than that contemplated by the
         Merger Agreement or have determined to accept a Superior Proposal, (c)
         a tender offer or exchange offer that, if successful, would result in
         any person or "group" becoming a "beneficial owner" (such terms having
         the meaning in the Merger Agreement as is ascribed under Regulation 13D
         under the Exchange Act) of 20% or more of the outstanding Vanguard
         Shares is commenced (other than by AT&T or its affiliates) and the
         Vanguard Board fails to recommend that Vanguard shareholders not tender
         their Vanguard Shares in such tender or exchange offer, (d) any person
         (other than AT&T or any of its affiliates) or group becomes the
         beneficial owner of 20% or more of the outstanding Vanguard Shares, (e)
         for any reason Vanguard fails to call or hold the Special Meeting by
         the Outside Date or (f) Vanguard has furnished or caused to be
         furnished
 
                                       54
<PAGE>   60
 
         confidential information or data, or engaged in negotiations or
         discussions with, another person; or
 
     (2) since the date of the Merger Agreement, there was any event,
         development or change of circumstance that constitutes, has had or
         could reasonably be expected to have, individually or in the aggregate,
         a material adverse effect on Vanguard and such material adverse effect
         is not cured within 30 days after written notice thereof or (a)(1)
         Vanguard has breached any covenant or agreement on the part of Vanguard
         or any of its subsidiaries set forth in the Merger Agreement, the
         Voting Agreements or the Vanguard Option Agreement, (2) any
         representation or warranty of Vanguard or any of its subsidiaries set
         forth in the Merger Agreement, the Voting Agreements or the Vanguard
         Option Agreement that is qualified as to materiality or material
         adverse effect has become untrue or (3) any representation or warranty
         of Vanguard or any of its subsidiaries set forth in the Merger
         Agreement, the Voting Agreements or the Vanguard Option Agreement that
         is not so qualified has become untrue in any material respect, (b) such
         breach or misrepresentation is not cured within 30 days after written
         notice thereof and (c) such breach or misrepresentation would cause the
         conditions to AT&T's obligations to consummate the Merger regarding the
         representations and warranties of Vanguard on the performance of
         obligations of Vanguard not to be satisfied.
 
     Termination by Vanguard.  The Merger Agreement may be terminated at any
time prior to the Effective Time, by action taken or authorized by the Vanguard
Board, whether before or after approval of the Merger Proposal by Vanguard
shareholders, if:
 
     (1) prior to the approval of Vanguard shareholders having been obtained,
         the Vanguard Board determines to accept a Superior Proposal, but only
         after Vanguard (a) provides AT&T with not less than 48 hours' notice of
         its determination to accept such Superior Proposal, including all
         material terms thereof, and (b) fulfills its obligations under the
         Merger Agreement upon such termination (provided that Vanguard's right
         to terminate the Merger Agreement under this provision shall not be
         available if Vanguard is then in breach of the Merger Agreement under
         Vanguard's obligations respecting Acquisition Proposals); or
 
     (2) (a)(i) AT&T has breached any covenant or agreement on the part of AT&T
         or Merger Sub set forth in the Merger Agreement, the Voting Agreements
         or the Vanguard Option Agreement, (ii) any representation or warranty
         of AT&T or Merger Sub that is qualified as to materiality or material
         adverse effect has become untrue or (iii) any representation or
         warranty of AT&T or Merger Sub that is not so qualified has become
         untrue in any material respect, (b) such breach or misrepresentation is
         not cured within 30 days after written notice thereof and (c) such
         breach or misrepresentation would cause the conditions to Vanguard's
         obligations to consummate the Merger regarding the representations and
         warranties of AT&T and Merger Sub or the performance of obligations of
         AT&T not to be satisfied (a "TERMINATING AT&T BREACH"). If, at any time
         after the Special Meeting has been called, a Terminating AT&T Breach
         exists, and Vanguard has given AT&T notice thereof, Vanguard shall have
         the right to adjourn or delay the Special Meeting until up to 10 days
         after such Terminating AT&T Breach has been cured or the 30-day cure
         period has expired.
 
TERMINATION FEES
 
     In the event of termination of the Merger Agreement by either Vanguard or
AT&T, the Merger Agreement will become void (other than covenants in the Merger
Agreement regarding reasonable commercial efforts with respect to the Voting
Agreements and the Vanguard Option Agreement), and there will be no liability or
obligation on the part of AT&T or Vanguard or their respective officers or
directors except with respect to (1) fees and expenses, termination fee(s) and
certain general
 
                                       55
<PAGE>   61
 
provisions in the Merger Agreement and (2) any liabilities or damages incurred
or suffered by a party as a result of the willful and material breach by the
other party of any of its representations, warranties, covenants or other
agreements set forth in the Merger Agreement.
 
     If the Merger Agreement is terminated as a result of the events described
in clause (4) under "-- Termination -- Termination by Either AT&T or Vanguard,"
clause (1) or clause (2) under "-- Termination -- Termination by AT&T," or
clause (1) of "-- Termination -- Termination by Vanguard," then Vanguard will
pay AT&T an amount equal to the sum of AT&T's expenses up to an amount equal to
$2 million. If the Merger Agreement is terminated as a result of the events
described in clause (2) under "-- Termination -- Termination by Vanguard," then
AT&T will pay to Vanguard an amount equal to the sum of all of Vanguard's
expenses up to an amount equal to $2 million.
 
     If the Merger Agreement is terminated as a result of the events described
in clause (1) (other than clause (1)(f)) under "-- Termination -- Termination by
AT&T" or clause (1) under "-- Termination -- Termination by Vanguard," then
Vanguard will pay to AT&T immediately prior to such termination, in the case of
a termination by Vanguard, or, within two business days thereafter, in the case
of a termination by AT&T, a termination fee of $52.5 million. In the event that
the Merger Agreement is terminated as a result of the events described in clause
(1)(f) or clause (2) under "-- Termination -- Termination by AT&T" then Vanguard
will pay AT&T, no later than two days after the earlier to occur of (a) the date
of entrance by Vanguard or any of its subsidiaries into an agreement concerning
a transaction that constitutes an Acquisition Proposal or (b) the date any
person or persons (other than AT&T) purchases 20% or more of the assets or
voting securities (in one or a series of transactions) of Vanguard and its
subsidiaries (provided that the entering of any definitive agreement referred to
in clauses (a) and (b) of this sentence is entered into by Vanguard or any of
its subsidiaries, or if there is no such agreement with respect to a purchase
contemplated by clause (b) of this sentence any tender, exchange or other offer
or arrangement for Vanguard's voting securities is first publicly disclosed,
within 12 months of such termination of the Merger Agreement), a termination fee
of $52.5 million. In the event the Merger Agreement is terminated as a result of
the events described in clause (4) under "-- Termination -- Termination by
Either AT&T or Vanguard" and Vanguard has not entered into an agreement
concerning an Acquisition Proposal and no person has purchased 20% or more of
the assets of Vanguard or Vanguard Shares, and no tender, exchange or other
offer or arrangement for Vanguard's securities has been publicly disclosed, then
Vanguard will pay to AT&T, upon such termination, a termination fee of $30
million, provided, however, that, if, within 12 months of such termination of
the Merger Agreement, Vanguard enters into an agreement concerning an
Acquisition Proposal or a person purchases 20% or more of the assets of Vanguard
or Vanguard Shares or a tender, exchange or other offer or arrangement for
Vanguard's securities has been publicly disclosed then, no later than two days
after the occurrence of any such event, Vanguard will pay AT&T an additional
termination fee of $22.5 million.
 
     If the Merger Agreement is terminated as a result of the events described
in clause (2) under "-- Termination -- Termination by Vanguard," then AT&T will
pay Vanguard an amount equal to the product of (x) $3.5 million and (y) the
percentage of outstanding Debentures purchased under the Tender Offer, plus all
Vanguard's expenses owed pursuant to the Merger Agreement. If the Merger
Agreement is terminated as a result of the events described in clause (2) under
"-- Termination -- Termination by Either AT&T or Vanguard," then AT&T will pay
Vanguard an amount equal to the product of (x) $1.75 million and (y) the
percentage of outstanding Debentures purchased under the Tender Offer, plus all
Vanguard's expenses owed pursuant to the Merger Agreement.
 
                                       56
<PAGE>   62
 
EXPENSES
 
     Whether or not the Merger is completed and except as described above, each
of AT&T and Vanguard will pay its own expenses in connection with the Merger. If
the Merger is consummated, Merger Sub will pay (1) all property or transfer
taxes imposed on Vanguard and (2) the expenses incurred in connection with
printing, filing and mailing this Proxy Statement/Prospectus to the Vanguard
shareholders.
 
AMENDMENT
 
     The Merger Agreement may be amended by the parties thereto, by action taken
or authorized by their respective Boards of Directors, at any time before or
after approval by Vanguard shareholders, but, after any such approval, no
amendment shall be made that by law or in accordance with the rules of the
NASDAQ/NM requires further approval by Vanguard shareholders without such
further approval. The Merger Agreement may not be amended except by an
instrument in writing signed on behalf of each of the parties thereto.
 
EXTENSION; WAIVER
 
     At any time prior to the Effective Time, AT&T and Vanguard (by action taken
or authorized by their respective Boards of Directors) may, to the extent
legally allowed, (1) extend the time for the performance of any of the
obligations or other acts of the other parties, (2) waive any inaccuracies in
the representations and warranties contained in the Merger Agreement or in any
document delivered pursuant thereto, or (3) waive compliance with any of the
agreements or conditions contained in the Merger Agreement (other than the
condition regarding the receipt of tax opinions, which is non-waivable). Any
agreement on the part of AT&T and Vanguard to any such extension or waiver will
be valid only if set forth in a written instrument signed on behalf of such
party. The failure of AT&T and Vanguard to assert any of their rights under the
Merger Agreement or otherwise will not constitute a waiver of those rights.
 
INDEMNIFICATION
 
     Merger Sub will cause to be maintained in effect (1) for a period of six
years after the Effective Time, the current provisions regarding indemnification
of officers and directors contained in the organizational documents of Vanguard
and its subsidiaries, and (2) for a period of six years, the current policies of
directors' and officers' liability insurance and fiduciary liability insurance
maintained by Vanguard, subject to certain cost limitations, with respect to
claims arising from facts or events that occurred on or before the Effective
Time.
 
EMPLOYEE BENEFITS
 
     AT&T has agreed that, for two years immediately following the Closing Date,
Merger Sub will maintain in effect employee benefit plans and arrangements that
provide benefits substantially comparable, in the aggregate, to the benefits
provided by Vanguard's benefit plans, provided that AT&T, at its sole option,
may provide employee benefits to Merger Sub that, in the aggregate, are
substantially comparable to those applicable to similarly situated employees of
AT&T.
 
     Pursuant to the Merger Agreement, Options owned by Messrs. Griffin, Leeolou
and Preyer that have not vested prior to the date of the Merger Agreement may be
accelerated prior to the Effective Date. All other Options that are not vested
as of the date of the Special Meeting will be accelerated to such date if (1)
the Merger is approved at the Special Meeting and (2) each holder of such
Options signs a consent that such holder will be entitled to receive only cash
upon exercise of such Options.
 
                                       57
<PAGE>   63
 
                                OTHER AGREEMENTS
 
     The following are descriptions of the material provisions of the Vanguard
Option Agreement and the Voting Agreements. A copy of the Vanguard Option
Agreement is attached as Appendix B to this Proxy Statement/Prospectus and is
incorporated herein by reference. Copies of the Voting Agreements, the
Charitable Trust and Family Foundation Voting Agreement and the Executive Loan
Letter Agreement have been filed as exhibits to the Registration Statement and
are incorporated herein by reference.
 
OPTION AGREEMENT
 
     Concurrent with the execution of the Merger Agreement, AT&T and Vanguard
entered into an option agreement, dated as of October 2, 1998 (the "VANGUARD
OPTION AGREEMENT"), under which Vanguard granted AT&T an option to purchase, in
whole or in part, up to 7,319,000 Vanguard Shares, representing 19.9% of the
issued and outstanding Vanguard Shares, at an exercise price of $23.00 per
share, subject to certain customary anti-dilution adjustments (the "VANGUARD
OPTION"). Under certain circumstances, in lieu of acquiring Vanguard Shares upon
exercise of the Vanguard Option, AT&T may elect to receive an amount in cash
equal to the value of such Vanguard Shares as measured by a formula set forth in
the Vanguard Option Agreement less the exercise price relating thereto, provided
that in no event shall such cash amount, together with any termination fee
received by AT&T under the Merger Agreement, exceed $53 million. Upon the
occurrence of a Purchase Event and prior to the termination of the Vanguard
Option, Vanguard has agreed to register Vanguard Shares covered by the Vanguard
Option (as well as Vanguard Shares covered under the Voting Agreements) for sale
by AT&T under the Securities Act.
 
     AT&T may not exercise the Vanguard Option until the occurrence of a
Purchase Event. A "PURCHASE EVENT" will occur upon termination of the Merger
Agreement as a result of:
 
     (1) the failure to obtain the Required Vanguard Vote at the Special Meeting
         (or of any adjournment thereof);
 
     (2) termination by AT&T as a result of (a) the withdrawal or adverse
         modification (or failure to reconfirm) by the Vanguard Board of its
         recommendation of the Merger or the Merger Agreement, (b) the
         determination by the Vanguard Board to recommend an alternative
         Acquisition Proposal or to accept a Superior Proposal, (c) a tender
         offer or exchange offer that would result in any person or group
         becoming a beneficial owner of 20% or more of the outstanding Vanguard
         Shares is commenced and the Vanguard Board fails to recommend that
         Vanguard shareholders not tender their Vanguard Shares in such tender
         or exchange offer, (d) any person or group becoming the beneficial
         owner of 20% or more of the outstanding Vanguard Shares, (e) the
         failure of Vanguard to call or hold the Special Meeting by the Outside
         Date or (f) Vanguard furnishing confidential information or data to, or
         engaging in negotiations or discussions with, another person or group
         regarding an alternative Acquisition Proposal;
 
     (3) termination by Vanguard upon the Vanguard Board determining to accept a
         Superior Proposal; or
 
     (4) termination by AT&T as a result of any development or change of
         circumstances that constitutes or could reasonably be expected to have
         a material adverse effect on Vanguard and such material adverse effect
         not being cured within 30 days, or as a result of certain breaches of
         the Merger Agreement, the Voting Agreements or the Vanguard Option
         Agreement; provided, however, that in the circumstances described in
         clause (2)(f) above and this clause (4), a Purchase Event will not
         occur unless, within 12 months of such termination, (a) Vanguard or any
         of its subsidiaries enters into an agreement concerning a transaction
         that constitutes an Acquisition Proposal or (b) any person or persons
         (other
 
                                       58
<PAGE>   64
 
         than AT&T) publicly announces a tender, exchange or other offer that
         results in such person or persons purchasing 20% or more of the assets
         or voting securities of Vanguard and its subsidiaries, or Vanguard or
         any of its subsidiaries enters into an agreement having such effect.
 
     The Vanguard Option Agreement will terminate on the earliest to occur of
(1) consummation of the Merger, (2) 12 months and one day after a termination of
the Merger Agreement under any provision that is or could result in the
occurrence of a Purchase Event, and (3) termination of the Merger Agreement
under any provision thereof that is not and could not result in a Purchase
Event.
 
VOTING AGREEMENTS
 
     In connection with the Merger Agreement, AT&T entered into Voting
Agreements with each of Messrs. Griffin, Leeolou, Preyer and Richardson,
Piedmont Harbor-Piedmont Associates Limited Partnership and the Smith Richardson
Foundation (collectively, the "SHAREHOLDERS"), under which each of the
Shareholders granted AT&T an option (the "SHAREHOLDER'S OPTION") to purchase,
under certain conditions, such Shareholder's Vanguard Shares (collectively,
6,678,889 Vanguard Shares, representing 16.62% of the issued and outstanding
Vanguard Shares as of the Record Date) at an exercise price of $23.00 per share
(the "VOTING AGREEMENTS"). If AT&T were to offer increased consideration to all
Vanguard shareholders for all of their Vanguard Shares, then the exercise price
under the Voting Agreements would be increased to equal such greater
consideration. Furthermore, if AT&T were to exercise any Shareholder's Option
within 12 months prior to such an increase in consideration, then AT&T would pay
to such Shareholder an amount equal to the product of (a) the number of Vanguard
Shares previously purchased from such Shareholder pursuant to the Voting
Agreement and (b) the amount of increase between the previous per share cash
price and the greater per share consideration. Any Vanguard Shares acquired by
the Shareholders following the date of the Voting Agreements (including Vanguard
Shares received upon exercise of any Options) shall also be similarly covered by
the Voting Agreements.
 
     Under the Voting Agreements, each Shareholder has agreed (1) to vote such
Shareholder's Vanguard Shares in favor of approval of the Merger Proposal and
against any Acquisition Proposal from any person other than AT&T, and (2) if so
requested, to deliver to AT&T an irrevocable proxy with respect to such Vanguard
Shares. Vanguard has agreed to indemnify the Shareholders from and against all
expenses (including reasonable attorneys' fees) incurred in connection with the
defense of any action (actual or threatened) arising out of the Voting
Agreements up to an aggregate of $1 million. Vanguard is not liable for any
settlement, judgment or award resulting from any such proceeding. Also under the
Voting Agreements, each Shareholder has agreed not to dispose of such
Shareholder's Vanguard Shares, except in certain limited cases for specified
purposes. Generally, in the event of any permitted disposal, AT&T has a right of
first refusal to purchase any Vanguard Shares to be sold.
 
     AT&T may not exercise any Shareholder's Option until either (1) the
occurrence of a Purchase Event or (2) the breach by such Shareholder of certain
provisions of the Voting Agreement.
 
     The Voting Agreements will terminate on the earliest to occur of (1)
consummation of the Merger, (2) 12 months and one day after a termination of the
Merger Agreement under any provision thereof that is or could result in the
occurrence of a Purchase Event, (3) termination of the Merger Agreement under
any provision thereof that is not and could not result in a Purchase Event, and
(4) 18 months from the Outside Date.
 
     On December 22, 1998, AT&T consented under the Merger Agreement to the
transfer of 784,782 Vanguard Shares, which Vanguard Shares are subject to the
Voting Agreements, by Messrs. Griffin, Leeolou and Preyer, to The Haynes G.
Griffin 1998 Charitable Remainder Unitrust, the Griffin Family Foundation, The
Stephen R. and Mary D. Leeolou 1998 Charitable Remainder
 
                                       59
<PAGE>   65
 
Unitrust, the Leeolou Family Foundation, the Lunsford Richardson Preyer, Jr.
Charitable Remainder Unitrust and the Preyer-Jacobs Foundation (the "CHARITABLE
TRUST AND FAMILY FOUNDATION SHAREHOLDERS"). In connection therewith, the
Charitable Trust and Family Foundation Shareholders entered into voting
agreements (the "CHARITABLE TRUST AND FAMILY FOUNDATION VOTING AGREEMENTS") on
terms substantially the same as the Voting Agreements, including granting to
AT&T an option to purchase transferred shares under the applicable Charitable
Trust and Family Foundation Voting Agreement (such options to purchase,
collectively, the "CHARITABLE TRUST AND FAMILY FOUNDATION SHAREHOLDERS'
OPTIONS").
 
     On December 28, 1998, AT&T consented, under the Merger Agreement, in a
letter agreement between Vanguard and AT&T (the "EXECUTIVE LOAN LETTER
AGREEMENT"), to the lending by Vanguard to certain of its executive officers
(the "EXECUTIVE LOAN PROGRAM") of funds for such executive officers to finance
the exercise of Options to purchase up to an aggregate of 4,398,795 Vanguard
Shares (1,580,045 of which are held by executive officers not parties to Voting
Agreements) and to satisfy certain related tax obligations, provided that any
such loan will be secured by the Vanguard Shares purchased thereby and by
certain other payments to be made to such executive officers in connection with
the Merger. In connection with such borrowing, such officers not parties to
Voting Agreements will be required to agree (1) to vote the Vanguard Shares
acquired in connection therewith in favor of approval of the Merger Agreement
and against any Acquisition Proposal from any person other than AT&T and (2) not
to sell, transfer, dispose of, encumber or otherwise convey any interest in such
Vanguard Shares prior to March 31, 1999. Such officers who are parties to Voting
Agreements will continue to be subject to such Voting Agreements.
 
     Except in certain limited circumstances, AT&T may not exercise the
Charitable Trust and Family Foundation Shareholders' Options until a termination
of the Merger Agreement pursuant to certain of the termination provisions
contained therein.
 
     In connection with each of the Vanguard Option Agreement, the Voting
Agreements, the Charitable Trust and Family Foundation Voting Agreements and the
Executive Loan Letter Agreement (and the Executive Loan Program), AT&T filed a
Schedule 13D with the SEC. AT&T expressly disclaims beneficial ownership of
Vanguard Shares that may be purchasable by AT&T under the Vanguard Option
Agreement, the Voting Agreements, the Charitable Trust and Family Foundation
Voting Agreements and the Executive Loan Letter Agreement (and the Executive
Loan Program).
 
                                       60
<PAGE>   66
 
                SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS
 
     The following are the only persons known to Vanguard who beneficially own
more than 5% of the outstanding Vanguard Shares as of March 22, 1999:
 
<TABLE>
<CAPTION>
                                                                   BENEFICIAL
                                                               Ownership(1)(2)(4)
                                                              --------------------
NAME AND ADDRESS                                               SHARES      PERCENT
- ----------------                                              ---------    -------
<S>                                                           <C>          <C>
Stuart S. Richardson........................................  2,728,151(3)   6.78%
c/o Lexington Global Asset Managers, Inc.
Park 80 West, Plaza Two
Saddle Brook, NJ 07663
</TABLE>
 
- -------------------------
 
(1) The descendants of Lunsford Richardson, Sr., their spouses, trusts and
    corporations in which they have interests and charitable organizations
    established by such descendants (collectively, the "RICHARDSON FAMILY")
    beneficially own approximately 8,247,187 Vanguard Shares, or 20.29% of the
    Vanguard Shares, and, consequently, may, if they act in concert, be in a
    position to control the management and the affairs of Vanguard. Such number
    of Vanguard Shares includes 479,188 Vanguard Shares that members of the
    Richardson Family have the right to acquire under presently exercisable
    Options. The individuals and institutions constituting the Richardson Family
    have differing interests and may not necessarily vote their Vanguard Shares
    in the same manner. Furthermore, trustees and directors have fiduciary
    obligations (either individually or jointly with other fiduciaries) that may
    dictate positions that differ from their personal interests.
 
(2) Unless otherwise indicated, all Vanguard Shares are owned of record by the
    person named and the beneficial ownership consists of sole voting power and
    sole investment power.
 
(3) Includes 81,250 Vanguard Shares that Mr. Richardson has the right to acquire
    under presently exercisable Options; 17,900 Vanguard Shares owned by Mr.
    Richardson's spouse; 1,057,759 Vanguard Shares held by the Smith Richardson
    Foundation, of which Mr. Richardson is a trustee; 83,882 Vanguard Shares
    held by various other trusts of which Mr. Richardson is also a trustee; and
    1,308,917 Vanguard Shares held by Piedmont Harbor-Piedmont Associates
    Limited Partnership over which Mr. Richardson obtained shared voting and
    investment authority pursuant to the terms of an appointment of agent, dated
    September 30, 1998, by the Managing General Partner Piedmont Harbor-Piedmont
    Associates Limited Partnership. The Vanguard Shares shown as beneficially
    owned do not include 50,012 Vanguard Shares held in trusts for the benefit
    of Mr. Richardson's children. Mr. Richardson denies beneficial ownership of
    the Vanguard Shares held by such trusts. Mr. Richardson denies beneficial
    ownership of the Vanguard Shares directly owned by his spouse. Mr.
    Richardson has entered into a Voting Agreement with respect to 50,736 of the
    Vanguard Shares he beneficially owns. The Smith Richardson Foundation and
    Piedmont Harbor-Piedmont Associates Limited Partnership have also entered
    into Voting Agreements.
 
(4) As described in "Other Agreements," AT&T has been granted under the
    Shareholder's Options, the Charitable Trust and Family Foundation
    Shareholder's Options and the Vanguard Option, options to purchase,
    collectively, up to 13,997,889 Vanguard Shares from Vanguard, Messrs.
    Preyer, Griffin, Leeolou and Richardson, the Smith Richardson Foundation and
    Piedmont Harbor-Piedmont Associates Limited Partnership, and from Vanguard.
    AT&T filed a Schedule 13D in connection with the Shareholder's Options and
    the Vanguard Option in which AT&T disclaimed beneficial ownership of
    Vanguard Shares subject to such agreements.
 
                                       61
<PAGE>   67
 
                        SECURITY OWNERSHIP OF MANAGEMENT
 
     The following table sets forth information with respect to the beneficial
ownership of Vanguard Shares, as of March 22, 1999 by (i) each director and the
executive officers named in the Summary Compensation Table included in
Vanguard's Proxy Statement dated April 20, 1998 and (ii) all directors and
executive officers as a group. Unless otherwise indicated, all Vanguard Shares
are owned of record by the individuals named and the beneficial ownership
consists of sole voting power and sole investment power. The number of Vanguard
Shares beneficially owned by each of the persons listed below includes Vanguard
Shares subject to options that become exercisable on or before the Effective
Time.
 
<TABLE>
<CAPTION>
                                                              AMOUNT AND NATURE OF
                  NAME OF BENEFICIAL OWNER                    BENEFICIAL OWNERSHIP    PERCENT
                  ------------------------                    --------------------    -------
<S>                                                           <C>                     <C>
Stuart S. Richardson........................................       2,728,151(1)        6.78 %
Haynes G. Griffin...........................................       1,659,800(2)        4.10 %
Stephen R. Leeolou..........................................       1,408,615(3)        3.47 %
L. Richardson Preyer, Jr. ..................................       1,387,573(4)        3.42 %
Timothy G. Biltz............................................          61,455(5)         *
Stephen L. Holcombe.........................................         311,464(6)         *
Richard C. Rowlenson........................................         290,993(7)         *
F. Cooper Brantley..........................................          27,198(8)         *
Doris R. Bray...............................................          14,800(9)         *
Robert M. DeMichele.........................................       1,068,259(10)       2.66 %
L. Richardson Preyer, Sr. ..................................          96,073(11)        *
Robert A. Silverberg........................................         171,000(12)        *
All Directors, Nominees and Executive Officers as a group
  (14 persons)..............................................       8,332,334(13)      19.79 %
</TABLE>
 
- ---------------
 *  Represents less than 1%
 
(1) For a detailed description of the nature of Mr. Richardson's beneficial
    ownership, see "Security Ownership of Certain Beneficial Owners."
 
(2) Mr. Griffin has entered into a Voting Agreement with respect to 1,357,993 of
    these Vanguard Shares. Also includes 319,938 Vanguard Shares that Mr.
    Griffin has the right to acquire under presently exercisable Options that,
    if exercised, will become subject to his Voting Agreement. Also includes
    5,271 Vanguard Shares owned by Mr. Griffin's spouse as to which he shares
    voting and investment power. Does not include 51,690 Vanguard Shares held by
    trusts, the sole beneficiaries of which are Mr. Griffin's sons and the
    trustee of which is Mr. Griffin's brother. Mr. Griffin denies beneficial
    ownership of the foregoing Vanguard Shares owned by his spouse and held by
    such trusts. Also does not include 200,000 Vanguard Shares held by a
    charitable remainder unitrust and 40,000 Vanguard Shares held by the Griffin
    Family Foundation, over which Mr. Griffin has no investment or voting
    authority.
 
(3) Mr. Leeolou has entered into a Voting Agreement with respect to 1,005,612 of
    these Vanguard Shares. Also includes 402,938 Vanguard Shares that Mr.
    Leeolou has the right to acquire under presently exercisable Options that,
    if acquired, will become subject to his Voting Agreement. Does not include
    36,954 Vanguard Shares held by trusts, the sole beneficiaries of which are
    Mr. Leeolou's children and the trustee of which is Mr. Leeolou's brother.
    Mr. Leeolou denies beneficial ownership of the Vanguard Shares held by these
    trusts. The Vanguard Shares shown also do not include 269,325 Vanguard
    Shares held by a trust of which Mr. Leeolou may be deemed to share
    investment power but over which he has no voting power. Also does not
    include 202,500 Vanguard Shares held by a charitable remainder unitrust and
    80,800 Vanguard Shares held by the Leeolou Family Foundation, over which Mr.
    Leeolou has no investment or voting authority.
 
                                       62
<PAGE>   68
 
 (4) Mr. Preyer has entered into a Voting Agreement with respect to 976,090 of
     these Vanguard Shares. Also includes 397,938 Vanguard Shares that Mr.
     Preyer has the right to acquire under presently exercisable Options that,
     if exercised, will become subject to his Voting Agreement. Also includes
     12,061 Vanguard Shares owned by Mr. Preyer's spouse as to which he shares
     voting and investment power. Does not include 63,279 Vanguard Shares held
     by trusts, the sole beneficiaries of which are Mr. Preyer's children and
     the trustee of which is Mr. Preyer's sister. Mr. Preyer denies beneficial
     ownership of the foregoing Vanguard Shares owned by his spouse and held by
     such trusts. The Vanguard Shares shown do not include 300,000 Vanguard
     Shares held by a trust of which Mr. Preyer may be deemed to share
     investment power but over which he has no voting power. Also does not
     include 249,736 Vanguard Shares held by a charitable remainder unitrust and
     11,746 Vanguard Shares held by the Preyer Jacobs Foundation, over which Mr.
     Preyer has no investment or voting authority.
 
 (5) Includes 60,299 Vanguard Shares that Mr. Blitz has the right to acquire
     under presently exercisable Options.
 
 (6) Includes 285,899 Vanguard Shares that Mr. Holcombe has the right to acquire
     under presently exercisable Options.
 
 (7) Includes 251,299 Vanguard Shares that Mr. Rowlenson has the right to
     acquire under presently exercisable Options. Also includes 14,427 Vanguard
     Shares owned by Mr. Rowlenson's spouse as to which he shares voting and
     investment power. Does not include 13,550 Vanguard Shares held by trusts,
     the sole beneficiaries of which are Mr. Rowlenson's children and the
     trustee of which is Mr. Rowlenson's brother-in-law. Mr. Rowlenson denies
     beneficial ownership of the foregoing Vanguard Shares owned by his spouse
     and held by such trusts.
 
 (8) Includes 6,000 Vanguard Shares that Mr. Brantley has the right to acquire
     under presently exercisable Options.
 
 (9) Includes 10,500 Vanguard Shares that Mrs. Bray has the right to acquire
     under presently exercisable Options.
 
(10) Includes 10,500 Vanguard Shares that Mr. DeMichele has the right to acquire
     under presently exercisable Options and 1,057,759 Vanguard Shares held by
     the Smith Richardson Foundation, Inc., of which Mr. DeMichele serves as one
     of eight trustees. The Vanguard Shares held by the Smith Richardson
     Foundation, Inc. are also reported as beneficially owned by Mr. Richardson,
     who is also a trustee. Mr. DeMichele denies beneficial ownership of
     Vanguard Shares held by the Smith Richardson Foundation, Inc.
 
(11) Includes 28,245 Vanguard Shares held by Mr. Preyer's spouse. Mr. Preyer
     denies beneficial ownership of the foregoing Vanguard Shares owned by his
     spouse. The Vanguard Shares shown do not include 14,929 Vanguard Shares
     held by a trust of which Mr. Preyer may be deemed to share investment power
     but over which he has no voting power.
 
(12) Includes 6,000 Vanguard Shares that Mr. Silverberg has the right to acquire
     under presently exercisable Options and 165,000 Vanguard Shares owned of
     record by a limited partnership of which Mr. Silverberg is managing
     partner.
 
(13) Includes 1,934,610 Vanguard Shares that directors and executive officers
     have the right to purchase under presently exercisable Options.
 
                                       63
<PAGE>   69
 
                         COMPARATIVE RIGHTS OF VANGUARD
                       SHAREHOLDERS AND AT&T SHAREHOLDERS
 
     Upon consummation of the Merger, some or all of the Vanguard shareholders
will become shareholders of AT&T and their rights will be governed by the
Amended AT&T Charter and the Amended AT&T By-laws, which differ in certain
material respects from the Vanguard Articles of Incorporation and the Vanguard
Bylaws. As shareholders of AT&T, the rights of former Vanguard shareholders will
also be governed by the New York Business Corporation Law (the "NYBCL") instead
of the North Carolina Business Corporation Act ("NCBCA"). New York is the
jurisdiction of incorporation of AT&T, and North Carolina is the jurisdiction of
incorporation of Vanguard.
 
     The following comparison of the NYBCL, the Amended AT&T Charter and the
Amended AT&T By-laws, on the one hand, and the NCBCA, the Vanguard Articles of
Incorporation and the Vanguard Bylaws, on the other hand, summarizes the
material differences but is not intended to list all differences.
 
BUSINESS COMBINATIONS
 
     Under the NCBCA, the approval by the affirmative vote of a majority of all
votes of a corporation entitled to be cast on the matter is required for a
merger, a share exchange or a transfer of substantially all of the corporation's
property to be consummated (unless a higher requirement is contained in the
articles of incorporation). The Vanguard Articles of Incorporation require a
vote of 66 2/3% of the outstanding Vanguard Shares to approve any such
transaction or a corporate dissolution if, on the Record Date, a person or group
of persons is the record or beneficial owner of more than 10% of the voting
shares of Vanguard. This provision is not applicable if the transaction is
approved by a majority of the Vanguard Board (excluding the 10% holder) and is
recommended by the Vanguard Board to the Vanguard shareholders. Accordingly,
this provision does not apply to the Merger, since the Merger has been
unanimously approved and recommended by the Vanguard Board.
 
     Under the NYBCL, a plan of merger or consolidation, a plan of share
exchange or the sale, lease, exchange or other disposition of all or
substantially all of the assets of a corporation is required to be approved (1)
in the case of corporations like AT&T that were in existence on February 22,
1998 and that do not expressly provide in their certificates of incorporation
for majority approval of such transactions, by two-thirds of the votes of all
outstanding shares entitled to vote thereon and (2) in the case of all other
corporations, by a majority of the votes of all outstanding shares entitled to
vote thereon. The AT&T Charter does not contain a provision expressly providing
for majority approval of such transactions.
 
     The NYBCL also provides that holders of shares of a class, or series of a
class, of capital stock of a corporation shall be entitled to vote together and
to vote as a separate class on any merger or consolidation in which (a) such
shares will remain outstanding after the merger or consolidation or will be
converted into the right to receive shares of stock of the surviving or
consolidated corporation or another corporation and (b) the charter of the
surviving or consolidated corporation or such other corporation immediately
after the effectiveness of the merger or consolidation would contain any
provision that is not contained in the charter of the pre-merger corporation and
that, if contained in an amendment thereto, would entitle the holders of shares
of such class or series of a class to vote as a separate class pursuant to the
procedures under the NYBCL for class voting on charter amendments discussed
under "-- Amendments to Charters."
 
STATE TAKEOVER LEGISLATION
 
     The NCBCA contains two anti-takeover provisions, the North Carolina
Shareholder Protection Act and the North Carolina Control Share Acquisition Act,
which restrict business combinations with
 
                                       64
<PAGE>   70
 
certain North Carolina corporations. Both the North Carolina Shareholder
Protection Act and the North Carolina Control Share Acquisition Act provide a
means by which a North Carolina corporation may "opt out" of the application of
these provisions. In accordance with the respective terms of the North Carolina
Shareholder Protection Act and the North Carolina Control Share Acquisition Act,
the Vanguard Bylaws provide that neither the North Carolina Shareholder
Protection Act nor the North Carolina Control Share Acquisition Act will be
applicable to Vanguard.
 
     Section 912 of the NYBCL prohibits any business combination (defined to
include a variety of transactions, including mergers, sales or dispositions of
assets, issuances of stock, liquidations, reclassifications and benefits from
the corporation, including loans or guarantees) with, involving or proposed by
any interested shareholder (defined generally as any person who, directly or
indirectly, beneficially owns 20% or more of the outstanding voting stock of a
New York corporation) for a period of five years after the date on which the
interested shareholder became an interested shareholder. After such five-year
period, a business combination between a New York corporation and such
interested shareholder is prohibited unless either certain "fair price"
provisions are complied with or the business combination is approved by a
majority of the outstanding voting stock not beneficially owned by such
interested shareholder or its affiliates and associates. The restrictions of the
NYBCL do not apply, however, to any business combination with an interested
shareholder if such business combination, or the purchase of stock by the
interested shareholder that caused such shareholder to become an interested
shareholder, was approved by the board of directors of the New York corporation
prior to the date on which the interested shareholder became an interested
shareholder.
 
     A New York corporation may adopt an amendment to its by-laws, approved by
the affirmative vote of a majority of votes of the outstanding voting stock,
excluding the voting stock of interested shareholders and their affiliates and
associates, expressly electing not to be governed by Section 912 of the NYBCL.
Such amendment will not, however, be effective until 18 months after such
shareholder vote and will not apply to any business combination with an
interested shareholder who was such on or prior to the effective date of such
amendment. The AT&T By-laws contain no provision electing not to be governed by
such section of the NYBCL.
 
RIGHTS OF DISSENTING SHAREHOLDERS
 
     Shareholders of a North Carolina corporation generally have the right to
dissent and receive payment of the fair value of their shares in the event of
certain business combinations and other fundamental changes in the corporation,
including mergers, share exchanges, a transfer of substantially all of the
property of the corporation except under certain limited circumstances, an
amendment to the articles of incorporation that materially and adversely affects
the rights of the dissenter's shares, and any other circumstance to the extent
the articles of incorporation, the by-laws or a resolution of the board of
directors provide for Dissenters' Rights.
 
     The Vanguard Articles of Incorporation and the Vanguard Bylaws contain no
provisions providing for Dissenters' Rights, and the Vanguard Board has adopted
no resolution providing for Dissenters' Rights. For a detailed description of
the procedures for exercising dissenters' rights, see "Rights of Dissenting
Vanguard Shareholders."
 
     Shareholders of a New York corporation whose shares are not listed on a
national securities exchange or designated as a national market system security
on an interdealer quotation system by the National Association of Securities
Dealers, Inc. have the right to dissent and receive payment of the fair value of
their shares, except as otherwise provided by the NYBCL, in the event of certain
amendments or changes to the certificate of incorporation adversely affecting
their shares, certain mergers or consolidations, certain sales, leases,
exchanges or other dispositions of all or substantially
 
                                       65
<PAGE>   71
 
all the corporation's assets and certain share exchanges. Holders of AT&T Shares
currently do not have such rights to dissent because AT&T Shares are listed on a
national securities exchange.
 
AMENDMENTS TO CHARTERS
 
     Under the NCBCA, a proposed amendment to a corporation's articles of
incorporation requires the affirmative vote of a majority of all votes entitled
to be cast on the matter, unless a higher vote is required in the articles of
incorporation. If any such amendment would adversely affect the rights of
holders of shares of a class or series of stock, the vote of holders of a
majority of all outstanding shares of that class or series, voting as a class,
is also necessary to authorize such amendment. The Vanguard Articles of
Incorporation require a vote of 66 2/3% of the votes entitled to be cast on an
amendment to the Vanguard Articles of Incorporation if the amendment changes the
high vote requirements referred to in "-- Business Combinations" and on an
amendment to the provision in the Vanguard Articles of Incorporation requiring a
66 2/3% vote for Vanguard shareholders to adopt, amend or repeal the Vanguard
Bylaws.
 
     Under the NYBCL, amendments to a certificate of incorporation generally
must be approved by a vote of the board of directors followed by vote of a
majority of all outstanding shares entitled to vote thereon at a meeting of
shareholders, provided that, if a provision of the certificate of incorporation
requires the vote of a greater number or proportion of shares, such provision
may not be altered, amended or repealed except by such greater vote. The
approval of a majority of the votes of all outstanding shares of any class of
capital stock of a corporation, voting separately as a class, is also required
to approve a proposed amendment to a corporation's certificate of incorporation,
whether or not such holders are otherwise entitled to vote on such amendment by
the certificate of incorporation, that:
 
     - would decrease the par value of the shares of such class, change any
       shares of such class into a different number of shares of the same class
       or into the same or a different number of shares of a different class,
       fix, change or abolish the designation of such class, alter or change the
       designation, relative rights, preferences or limitations of the shares of
       such class or provide new conversion rights or, alter any existing
       conversion rights so as to affect them adversely;
 
     - would exclude or limit the voting rights of the shares of such class,
       except as such rights may be limited by voting rights given to new shares
       then being authorized of any existing or new class or series of shares;
       or
 
     - would subordinate the rights of the shares of such class by authorizing
       shares having preferences superior to the rights of such existing shares.
 
     For this purpose, if a proposed amendment would have any of the effects
listed in the immediately preceding sentence on one or more series of any class
so as to affect them adversely but would not so affect the entire class, then
only the shares of the series so affected by the amendment would be entitled to
vote as a separate class on the amendment. Accordingly, a proposed amendment the
adverse effect of which on the powers, preferences or special rights of any
class or series of shares of AT&T does not differ from its adverse effect on the
powers, preferences or special rights of any other class or series of shares of
AT&T would not entitle such class to vote separately from the other classes of
shares of AT&T.
 
AMENDMENTS TO BYLAWS
 
     The NCBCA provides that a corporation's board of directors may amend or
repeal the corporation's bylaws, except to the extent otherwise provided in the
articles of incorporation or in a bylaw adopted by the shareholders. A bylaw
adopted, amended or repealed by the shareholders may not be readopted, amended
or repealed by the board of directors unless otherwise provided in the articles
of incorporation or the bylaws. The Vanguard Bylaws provide that the Vanguard
Board has
 
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<PAGE>   72
 
the power to adopt, amend or repeal bylaws except to the extent limited by law.
The Vanguard Articles of Incorporation and the Vanguard Bylaws provide that the
shareholders of Vanguard may exercise their power to adopt, amend or repeal
bylaws only by affirmative vote of holders of at least 66 2/3% of the
outstanding shares of capital stock entitled to vote generally in the election
of directors.
 
     Under the NYBCL, except as otherwise provided in the certificate of
incorporation, by-laws may be amended, repealed or adopted by a majority of the
votes cast by the shares at the time entitled to vote in the election of any
directors. When so provided in the certificate of incorporation or a by-law
adopted by the shareholders, by-laws also may be amended, repealed or adopted by
the board of directors by such vote as may be therein specified, which may be
greater than the vote otherwise prescribed by the NYBCL, but any by-law adopted
by the board of directors may be amended or repealed by the shareholders
entitled to vote thereon as provided by the NYBCL.
 
     The AT&T By-laws may be amended by the shareholders of AT&T at any meeting,
or by the AT&T Board at any meeting by a majority vote of the full AT&T Board or
at two successive meetings by a majority vote of a quorum present.
 
NO PREEMPTIVE RIGHTS
 
     Under the NCBCA, a corporation's shareholders do not possess preemptive
rights to purchase additional shares of a corporation's capital stock unless
such rights are specifically granted by the articles of incorporation. However,
shareholders of corporations incorporated before July 1, 1990, other than public
corporations, have preemptive rights unless the articles of incorporation
expressly provide otherwise. A "public corporation" is defined in the NCBCA as a
corporation that has a class of shares registered under Section 12 of the
Exchange Act. Vanguard is a public corporation and the Vanguard Articles of
Incorporation specifically state that no Vanguard shareholder will be entitled
to preemptive rights.
 
     Under the NYBCL, except as otherwise provided in the NYBCL or in the
certificate of incorporation, holders of equity shares of any corporation (like
AT&T) incorporated prior to February 22, 1998 are granted certain preemptive
rights. The AT&T Charter provides that no holder of AT&T Shares has any
preemptive rights to purchase any AT&T Shares or other securities of AT&T.
 
REDEMPTION OF CAPITAL STOCK
 
     Under the NCBCA, subject to certain limitations, a corporation's capital
stock may be made subject to redemption by the corporation at its option, at the
option of holders of such stock or otherwise. The Vanguard Articles of
Incorporation contain no redemption provisions with respect to its capital
stock. The Vanguard Articles of Incorporation authorize 1,000,000 shares of
preferred stock, par value $.01 per share, the preferences, limitations and
relative rights of which may be fixed by the Vanguard Board. Such preferred
shares could be made redeemable should the Vanguard Board so determine. The
preferences, limitations and relative rights of the authorized preferred shares
have not been fixed, and no preferred shares are outstanding.
 
     Under the NYBCL, subject to certain limitations, a corporation's
certificate of incorporation may provide for one or more classes or series of
shares to be redeemable at the option of the corporation, the holders thereof,
other persons or upon the happening of a specified event for cash, other
property, indebtedness or other securities of the same or another corporation,
at such time or times, price or prices, or rate or rates, and with such
adjustments, as are stated in the certificate of incorporation. The AT&T Charter
does not contain such a provision.
 
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<PAGE>   73
 
DIVIDEND SOURCES
 
     Under the NCBCA, a board of directors may authorize a corporation to make
dividends and other distributions to its shareholders, subject to any
restrictions contained in the corporation's articles of incorporation. No
distribution may be made, however, if, after giving effect to the distribution,
the corporation would not be able to pay its debts as they become due in the
usual course of business, or the corporation's total assets would be less than
the sum of its total liabilities, plus the amount of any preferential rights of
any outstanding shares on dissolution of the corporation. The Vanguard Articles
of Incorporation contain no limitations on the payment of dividends or other
distributions.
 
     Under the NYBCL, except as otherwise provided in the NYBCL, dividends may
be declared and paid and other distributions may be made out of surplus only, so
that the net assets of the corporation remaining after such declaration, payment
or distribution must at least equal the amount of its stated capital. A
corporation may declare and pay dividends or make other distributions, except
when the corporation is insolvent or would thereby be made insolvent, or when
the declaration, payment or distribution would be contrary to any restrictions
contained in the corporation's certificate of incorporation.
 
     Following the Merger, AT&T expects to continue to pay its regular quarterly
dividend on AT&T Shares at its current rate, subject to any change that the AT&T
Board may determine.
 
DURATION OF PROXIES
 
     Under the NCBCA, a proxy is valid for 11 months after it is given, unless a
different period is expressly provided in the proxy appointment form. A proxy is
revocable unless it states that it is irrevocable and it is coupled with an
interest sufficient in law to support an irrevocable power.
 
     Under the NYBCL, no proxy is valid for more than 11 months after its date,
unless otherwise provided in the proxy. Irrevocable proxies may be created for:
 
     - a pledgee;
 
     - a person who has purchased or agreed to purchase the shares;
 
     - a creditor of the corporation who extends credit in consideration of the
       proxy;
 
     - a person who has contracted to perform services as an officer of the
       corporation if a proxy is required by the employment contract; and
 
     - a person designated under a voting agreement.
 
SHAREHOLDER ACTION
 
     Under the NCBCA, any action required or permitted to be taken at a meeting
of shareholders may be taken without a meeting if the action is taken by written
consent of all of the shareholders entitled to vote on the action. The consent
may be signed by shareholders either before or after the action is taken.
 
     Under the NYBCL, any action required or permitted to be taken by a vote at
a meeting of shareholders may be taken without a meeting by written consent,
setting forth the action so taken, signed by the holders of all outstanding
shares entitled to vote thereon or, if the certificate of incorporation so
permits, signed by holders of outstanding shares having not less than the
minimum number of votes that would be necessary to authorize or take such action
at a meeting at which all shares entitled to vote thereon were present and
voted. The AT&T Charter does not contain such a provision.
 
     The NYBCL also provides that no written consent of shareholders shall be
effective unless, within 60 days of the earliest dated consent delivered to the
corporation, the corporation shall have
 
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<PAGE>   74
 
received written consents from a sufficient number of holders to take the action
specified therein. Prompt notice of the taking of corporate action without a
meeting shall be given to those shareholders who have not consented in writing.
 
SHAREHOLDER PROPOSALS
 
     The AT&T By-laws require that, for business to be properly brought before
an annual meeting by a shareholder, the shareholder must have delivered notice
thereof to AT&T (containing certain information specified in the AT&T By-laws)
not less than 90 nor more than 120 days prior to the first anniversary of the
preceding year's annual meeting. This requirement is separate and apart from and
in addition to the requirements that a shareholder must meet to have a
shareholder proposal included in AT&T's proxy statement under SEC Rule 14a-8.
 
     The Vanguard Bylaws contain no such provision.
 
MEETINGS OF SHAREHOLDERS
 
     The NCBCA provides that a special meeting of shareholders may be called by
the board of directors, the person or persons authorized by the articles of
incorporation or the by-laws to call meetings, or by written demand of holders
of at least 10% of the votes entitled to be cast on any issue proposed to be
considered at the proposed special meeting. The right of shareholders to demand
the call of a meeting does not, however, apply to shareholders of a public
corporation. Vanguard is a public corporation and, therefore, shareholders may
not demand special meetings.
 
     The NCBCA also provides that, if an annual meeting of shareholders is not
held within 15 months after a corporation's last annual meeting, the Superior
Court of the county where the corporation's principal office is located may,
upon application of any shareholder, call an annual meeting.
 
     The NYBCL provides that, if, for a period of one month after the date fixed
by or under the by-laws for the annual meeting of shareholders or, if no date
has been so fixed, for a period of 13 months after the last annual meeting,
there is a failure to elect a sufficient number of directors to conduct the
business of the corporation, the board of directors of the corporation shall
call a special meeting for the election of directors. If such special meeting is
not called by the board of directors of the corporation within two weeks after
the expiration of such period or if it is called but there is a failure to elect
such directors for a period of two months after the expiration of such period,
holders of 10% of the votes of the shares entitled to vote in an election of
directors may, in writing, demand the call of a special meeting for the election
of directors.
 
     The NYBCL also provides that special meetings of shareholders may be called
by the board of directors and by such persons as may be authorized in the
certificate of incorporation or by-laws. The AT&T By-laws provide that special
meetings of the shareholders may be called at any time by the Chairman of the
Board, by the AT&T Board or upon a request signed by shareholders representing
at least 33 1/3% of the AT&T Shares.
 
CUMULATIVE VOTING
 
     Under the NCBCA, the articles of incorporation may provide that
shareholders may cumulate their votes in elections of directors. Otherwise, the
corporation's shareholders have no such rights with certain exceptions. None of
the exceptions apply to Vanguard because it is a public corporation. The
Vanguard Articles of Incorporation do not provide for cumulative voting.
 
     Under the NYBCL, the certificate of incorporation may provide that in all
elections of directors each shareholder is entitled to cumulate such
shareholder's votes. The AT&T Charter does not contain such a provision.
 
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<PAGE>   75
 
NUMBER AND ELECTION OF DIRECTORS
 
     The NCBCA provides that the articles of incorporation or by-laws of a
corporation will establish the number of directors or how the number will be
fixed. The board of directors may be granted the power under the articles of
incorporation or the by-laws to fix or change the number of directors, but the
board may increase or decrease the number of directors by no more than 30%
during any 12-month period. The NCBCA also provides that the articles of
incorporation or by-laws may provide for a minimum and maximum number of
directors to be fixed and changed from time to time by the shareholders or the
board of directors, as provided in the articles of incorporation or the by-laws.
The NCBCA permits a corporation to have a staggered board of directors, with
two, three or four groups of directors being elected every two, three or four
years, as the case may be. The Vanguard Bylaws provide for a minimum of nine and
a maximum of 17 directors, with the exact number of directors to be determined
from time to time by the Vanguard Board. The Vanguard Bylaws also provide for a
staggered Vanguard Board that is divided into three classes, with each director
serving a three-year term.
 
     Subject to certain limitations, the NYBCL permits the number of directors
of a corporation to be fixed by its by-laws, by action of the shareholders or by
action of the board of directors under the specific provision of a by-law
adopted by the shareholders. At each annual meeting of shareholders, directors
are to be elected to hold office until the next annual meeting, except as
described below for corporations with classified boards of directors. In
addition, the NYBCL permits the certificate of incorporation or the specific
provisions of a by-law adopted by the shareholders to provide that directors be
divided into either two, three or four classes. All classes must be as nearly
equal in number as possible. The term of office of one class of directors shall
expire each year, with the terms of office of no two classes expiring the same
year. New amendments to the NYBCL delete the requirement of at least three
directors in any class.
 
     The AT&T Charter provides that the number of directors shall be as provided
for in the AT&T By-laws. The AT&T By-laws provide that the number of directors
shall be not less than 10 nor more than 25, the exact number of directors within
such minimum and maximum limits to be fixed and determined by the vote of a
majority of the entire AT&T Board. Currently, AT&T has 12 directors. AT&T does
not have a classified board of directors.
 
REMOVAL OF DIRECTORS
 
     The NCBCA provides that the shareholders may remove one or more directors
with or without cause unless the articles of incorporation provide that
directors may be removed only for cause. The Vanguard Articles of Incorporation
contain no provisions relating to the removal of directors. Directors may not be
removed unless the notice of the meeting at which the vote is to be taken states
that the purpose, or one of the purposes, of the meeting is removal of the
director. The removal of directors, with or without cause, is subject to the
following: (1) in the case of a corporation having cumulative voting, no
director may be removed when the votes cast against such director's removal
would be sufficient to elect the director if voted cumulatively, and (2) if a
director is elected by the holders of shares of any class or series, such
director may be removed only by the applicable vote of the holders of the shares
of that class or series voting as a class.
 
     The NCBCA also provides that the Superior Court of the county where a
corporation's principal office is located may remove a director in a proceeding
commenced either by the corporation or by shareholders holding at least 10% of
the outstanding shares of any class if the Superior Court finds that the
director has engaged in fraudulent or dishonest conduct, or gross abuse of
authority or discretion, and that the removal is in the best interest of the
corporation.
 
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<PAGE>   76
 
     The NYBCL provides that any or all of the directors may be removed for
cause by vote of the shareholders and, if the certificate of incorporation or
the specific provisions of a by-law adopted by the shareholders provide,
directors may be removed for cause by action of the board of directors. If the
certificate of incorporation or the by-laws so provide, any or all of the
directors may be removed without cause by vote of the shareholders. The removal
of directors, with or without cause, is subject to the following: (1) in the
case of a corporation having cumulative voting, no director may be removed when
the votes cast against such director's removal would be sufficient to elect the
director if voted cumulatively, and (2) if a director is elected by the holders
of shares of any class or series, such director may be removed only by the
applicable vote of the holders of the shares of that class or series voting as a
class. An action to procure a judgment removing a director for cause may be
brought by the Attorney General of New York or by the holders of 10% of the
outstanding shares, whether or not entitled to vote.
 
     Neither the AT&T Charter nor the AT&T By-laws provide that directors may be
removed without cause by action of the shareholders or that directors may be
removed by the AT&T Board.
 
VACANCIES
 
     The NCBCA provides that, unless the articles of incorporation provide
otherwise, if a vacancy occurs on the board of directors by reason of an
increase in the number of directors, the failure by the shareholders to elect
the full authorized number of directors, or otherwise, the shareholders or the
board of directors may fill the vacancy. The Vanguard Bylaws provide that the
Vanguard Board may fill vacancies on the Vanguard Board.
 
     Under the NYBCL, newly created directorships resulting from an increase in
the number of directors and vacancies occurring on the board of directors for
any reason except the removal of directors without cause may be filled by the
vote of the board of directors. Unless the certificate of incorporation or
by-laws provide otherwise, a vacancy in a directorship elected by holders of a
particular class or series of shares shall be filled by a vote of the other
directors elected by holders of the same class or series. However, the
certificate of incorporation or by-laws may provide that such newly created
directorships or vacancies are to be filled by vote of the shareholders. Unless
the certificate of incorporation or the specific provisions of a by-law adopted
by the shareholders provide that the board of directors may fill vacancies
occurring on the board of directors by reason of the removal of directors
without cause, such vacancies may be filled only by vote of the shareholders. A
director elected to fill a vacancy, unless elected by the shareholders, will
hold office until the next meeting of shareholders at which the election of
directors is in the regular order of business and until his or her successor has
been elected and qualified. Notwithstanding the foregoing, unless otherwise
provided in the certificate of incorporation or by-laws, whenever the holders of
one or more classes or series of shares are entitled to elect one or more
directors by the certificate of incorporation, any vacancy that may be filled by
the board or a majority of the directors then in office shall be filled by a
majority of the directors then in office that were elected by such classes or
series.
 
     The AT&T By-laws provide that any vacancy on the AT&T Board may be filled
by a majority vote of the remaining directors, though less than a quorum.
 
INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Under the NCBCA, a corporation may indemnify any director, officer,
employee or agent made a party to any proceeding if such person acted in good
faith and in a manner such person reasonably believed to be in or, in cases of
conduct other than in the person's official capacity with the corporation, not
opposed to the best interest of the corporation and, with respect to any
criminal proceeding, if such person had no reasonable cause to believe that such
person's conduct was unlawful. The Vanguard Bylaws provide that Vanguard will
generally indemnify directors and
 
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<PAGE>   77
 
executive officers, to the extent permitted by law, against all liability and
expenses in any proceeding arising out of their status as directors or officers
or their activities in any such capacities or in any capacity in which any of
them is or was serving, at the corporation's request, in another corporation or
other entity, or in any service as fiduciaries under the Employee Retirement
Income Security Act of 1974, as amended. Both the NCBCA and the Vanguard Bylaws
provide for the advance of expenses in connection with any such proceeding.
 
     The NCBCA mandates that any director or officer who is wholly successful on
the merits or otherwise in the defense of any proceeding in which he or she was
a party because he or she was a director or officer of the corporation be
indemnified against reasonable expenses incurred by such individual in
connection with the proceeding. The NCBCA also authorizes the court conducting
any such proceeding or any other court of competent jurisdiction to provide
indemnification upon application of a director or officer of a corporation if it
determines that (1) the director or officer is entitled to mandatory
indemnification under the NCBCA, or (2) the director or officer is fairly and
reasonably entitled to indemnification in view of all relevant circumstances.
 
     In addition to the foregoing, the NCBCA permits a corporation, in its
articles of incorporation or by-laws, or by contract, to indemnify officers,
directors, employees or agents, except that a corporation may not indemnify a
person against liabilities and expenses on account of activities that were at
the time known or believed by such person to be clearly in conflict with the
best interests of the corporation. The NCBCA also permits a corporation to
purchase and maintain insurance on behalf of its directors, officers, employees
and agents, whether or not the corporation would have the power to indemnify any
such person against the same liability under any provision of the NCBCA.
Vanguard maintains officer and director liability insurance with respect to its
directors and officers.
 
     In order to indemnify a director or officer, a North Carolina corporation
must determine that indemnification is permissible under the NCBCA, by a
majority vote of a quorum of the board of directors consisting of directors not
at the time parties to the proceeding, or, if such a quorum cannot be obtained,
by majority vote of a committee of two or more directors not at the time parties
to the proceeding, or by special legal counsel, or by the shareholders.
 
     Under the NYBCL, a corporation may indemnify its directors and officers
made, or threatened to be made, a party to any action or proceeding, except for
shareholder derivative suits, if such director or officer acted in good faith,
for a purpose that he or she reasonably believed to be in or, in the case of
service to another corporation or enterprise, not opposed to, the best interests
of the corporation and, in criminal proceedings, in addition, had no reasonable
cause to believe his or her conduct was unlawful. In the case of shareholder
derivative suits, the corporation may indemnify a director or officer if he or
she acted in good faith for a purpose that he or she reasonably believed to be
in or, in the case of service to another corporation or enterprise, not opposed
to, the best interests of the corporation. Notwithstanding the foregoing, that
no indemnification may be made in respect of (1) a threatened action, or a
pending action that is settled or otherwise disposed of, or (2) any claim, issue
or matter as to which such individual has been adjudged to be liable to the
corporation, unless and only to the extent that the court in which the action
was brought, or, if no action was brought, any court of competent jurisdiction,
determines upon application that, in view of all the circumstances of the case,
the person is fairly and reasonably entitled to indemnity for such portion of
the settlement amount and expenses as the court deems proper.
 
     Any individual who has been successful on the merits or otherwise in the
defense of a civil or criminal action or proceeding will be entitled to
indemnification. Except as provided in the preceding sentence, or ordered by a
court pursuant to the NYBCL, any indemnification under the NYBCL pursuant to the
above paragraph may be made only if authorized in the specific case and after a
finding that the director or officer met the applicable standard of conduct by
the disinterested directors if a quorum is available, or, if such a quorum so
directs or is unavailable (1) the board of
 
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<PAGE>   78
 
directors upon the written opinion of independent legal counsel or (2) the
shareholders. A corporation may advance expenses incurred by a director or
officer in defending any action or proceeding prior to its final disposition
upon receipt of an undertaking by or on behalf of such individual to repay such
advance to the extent that it exceeds the indemnification to which such
individual is entitled.
 
     The indemnification described above under the NYBCL is not exclusive of
other indemnification rights to which a director or officer may be entitled,
whether contained in the certificate of incorporation or by-laws or when
authorized by such certificate of incorporation or by-laws, (1) a resolution of
shareholders, (2) a resolution of directors or (3) an agreement providing for
such indemnification, provided that no indemnification may be made to or on
behalf of any director or officer if a judgment or other final adjudication
adverse to the director or officer establishes that his or her acts were
committed in bad faith or were the result of active and deliberate dishonesty
and were material to the cause of action so adjudicated, or that he or she
personally gained in fact a financial profit or other advantage to which he or
she was not legally entitled.
 
     The AT&T By-laws provide that AT&T is authorized, by (1) a resolution of
shareholders, (2) a resolution of directors or (3) an agreement providing for
such indemnification, to the fullest extent permitted by applicable law, to
provide indemnification and to advance expenses to its directors and officers in
respect of claims, actions, suits or proceedings based upon, arising from,
relating to or by reason of the fact that any such director or officer serves or
served in such capacity with the corporation or at the request of AT&T in any
capacity with any other enterprise. AT&T has entered into indemnification
agreements with certain of its officers and directors in accordance with the
AT&T By-laws.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers or persons controlling AT&T or Vanguard
pursuant to the foregoing provisions, AT&T and Vanguard have been informed that,
in the opinion of the SEC, such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable.
 
LIMITATION OF PERSONAL LIABILITY OF DIRECTORS
 
     The NCBCA provides that a corporation's articles of incorporation may
include a provision limiting the personal liability of a director to the
corporation or its shareholders for monetary damages for breach of any duty as a
director. However, no such provision is effective with respect to:
 
     - acts or omissions that the director at the time of such breach knew or
       believed to be clearly in conflict with the best interests of the
       corporation;
 
     - any liability for unlawful distribution to shareholders in violation of
       the provisions of the NCBCA;
 
     - any transaction from which the director derived an improper personal
       benefit; or
 
     - acts or omissions occurring prior to the date the provision in the
       articles of incorporation became effective.
 
     The Vanguard Articles of Incorporation contain a provision eliminating the
personal liability for monetary damages of its directors to the fullest extent
permitted by the NCBCA.
 
     The NYBCL provides that a corporation's certificate of incorporation may
contain a provision eliminating or limiting the personal liability of directors
to the corporation or its shareholders for damages for any breach of duty in
such capacity. However, no such provision can eliminate or limit the liability
of any director (1) if a judgment or other final adjudication adverse to such
director establishes that such director's acts or omissions were in bad faith,
or involved intentional misconduct or a knowing violation of law, or that the
director personally gained in fact a financial profit or other advantage to
which such director was not legally entitled or that the director's acts
violated Section 719 of the NYBCL (which includes declaration of dividends,
purchase of capital stock,
 
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<PAGE>   79
 
distribution of assets to shareholders after dissolution of the corporation and
loans to directors to the extent contrary to New York law) or (2) for any act or
omission prior to the adoption of such a provision in the certificate of
incorporation.
 
     The AT&T Charter provides that no director will be personally liable to
AT&T or any of its shareholders for damages for any breach of duty as a
director; provided, however, that the liability of a director will not be
eliminated or limited (1) if a judgment or other final adjudication adverse to
him or her establishes that his or her acts or omissions were in bad faith or
involved intentional misconduct or a knowing violation of law or that he or she
personally gained in fact a financial profit or other advantage to which he or
she was not legally entitled or that his or her acts violated Section 719 of the
NYBCL (which includes declaration of dividends, purchase of capital stock,
distribution of assets to shareholders after dissolution of the corporation and
loans to directors to the extent contrary to New York law) or (2) for any act or
omission prior to the adoption of this provision by AT&T shareholders.
 
                                 LEGAL OPINIONS
 
     The legality of the AT&T Shares to be issued in connection with the Merger
is being passed upon for AT&T by Robert S. Feit, Esq., General Attorney and
Assistant Secretary of AT&T. As of March 22, 1999, Mr. Feit owned 3,043 AT&T
Shares and held options to purchase an additional 17,500 AT&T Shares.
 
     Certain of the tax consequences of the Merger will be passed upon at the
Effective Time, as a condition to the Merger, by Wachtell, Lipton, Rosen & Katz
on behalf of AT&T, and by Latham & Watkins on behalf of Vanguard. See "The
Merger -- Material Federal Income Tax Consequences."
 
                                    EXPERTS
 
     The consolidated balance sheets of AT&T as of December 31, 1998 and 1997
and the consolidated statements of income, changes in shareowners' equity, and
cash flows for each of the three years in the period ended December 31, 1998,
incorporated by reference in this Proxy Statement/Prospectus, have been
incorporated herein in reliance on the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of that firm as experts in
accounting and auditing.
 
     The financial statements and schedules of Vanguard, Eastern North Carolina
Cellular Joint Venture, Inter-Act Systems, Incorporated and PT Rajasa Hazanah
Perkasa, incorporated in this Proxy Statement/Prospectus have been audited by
Arthur Andersen LLP, independent public accountants, as indicated in their
reports with respect thereto, and are included herein in reliance upon the
authority of said firm as experts in accounting and auditing in giving said
reports.
 
     The financial statements of Star Digitel Limited have been audited by
Arthur Andersen & Co., independent public accountants, as indicated in their
report with respect thereto, and such report is included herein in reliance upon
the authority of said firm as experts in accounting and auditing in giving said
reports.
 
     The consolidated balance sheets of IWCH and subsidiary as of December 31,
1996 and 1997, and the related consolidated statements of operations,
stockholders' deficit, and cash flows for each of the years in the three-year
period ended December 31, 1997, which report appears in the Form 10-K of
Vanguard for the fiscal year ended December 31, 1997, as amended, have been
incorporated by reference herein in reliance upon the report, dated April 10,
1998, of KPMG LLP, independent certified public accountants, incorporated by
reference herein, and upon the authority of said firm as experts in accounting
and auditing. This report contains an explanatory paragraph that states that
 
                                       74
<PAGE>   80
 
IWCH has suffered recurring losses from operations and has a net capital
deficiency, which raise substantial doubt concerning its ability to continue as
a going concern.
 
     The consolidated balance sheets of TCI and subsidiaries as of December 31,
1998 and 1997, and the related consolidated statements of operations and
comprehensive earnings, stockholders' equity, and cash flows for each of the
years in the three-year period ended December 31, 1998, which appear in the
Current Report on Form 8-K, dated March 22, 1999, of AT&T, have been
incorporated by reference herein in reliance upon the report, dated March 9,
1999, of KPMG LLP, independent certified public accountants, incorporated by
reference herein, and upon the authority of said firm as experts in accounting
and auditing.
 
     The combined balance sheets of Liberty/Ventures Group as of December 31,
1998 and 1997, and the related combined statements of operations and
comprehensive earnings, equity, and cash flows for each of the years in the
three-year period ended December 31, 1998, which appear in the Current Report on
Form 8-K, dated March 22, 1999, of AT&T have been incorporated by reference
herein in reliance upon the report, dated March 9, 1999, of KPMG LLP,
independent certified public accountants, incorporated by reference herein, and
upon the authority of said firm as experts in accounting and auditing.
 
                       SHAREHOLDER PROPOSALS FOR THE 1999
                            VANGUARD ANNUAL MEETING
 
     Vanguard will hold a 1999 Annual Meeting of Shareholders only if the Merger
is not consummated before the time of such meeting. In the event that such a
meeting is held, any proposals of shareholders intended to be presented at the
1999 Annual Meeting of Shareholders must have been received by the Secretary of
Vanguard on or before December 21, 1998 in order to be considered for inclusion
in Vanguard's 1999 proxy materials.
 
                                       75
<PAGE>   81
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
     AT&T and Vanguard file annual, quarterly and special reports, proxy
statements and other information with the SEC. You may read and copy any
materials we file with the SEC at the SEC's Public Reference Room at 450 Fifth
Street, N.W., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for
further information on the Public Reference Room. Our SEC filings are also
available to the public from commercial document retrieval services and at the
Internet world wide web site maintained by the SEC at http://www.sec.gov.
 
     AT&T filed a Registration Statement on Form S-4 (the "REGISTRATION
STATEMENT") to register with the SEC the AT&T Shares to be issued to Vanguard
shareholders in the Merger. This Proxy Statement/Prospectus is a part of that
Registration Statement and constitutes a prospectus of AT&T, as well as being a
proxy statement of Vanguard for the Special Meeting.
 
     As allowed by SEC rules, this Proxy Statement/Prospectus does not contain
all the information you can find in the Registration Statement or the exhibits
to that Registration Statement.
 
     The SEC allows us to "incorporate by reference" business and financial
information into this Proxy Statement/Prospectus, which means that we can
disclose important information to you by referring you to another document filed
separately with the SEC. The information incorporated by reference is deemed to
be part of this Proxy Statement/Prospectus. This Proxy Statement/Prospectus
incorporates by reference the documents set forth below that we have previously
filed with the SEC. These documents contain important information about our
companies and their financial condition.
 
<TABLE>
<CAPTION>
AT&T SEC FILINGS (FILE NO. 1-1105)*                                    PERIOD
- -----------------------------------                                    ------
<S>                                            <C>
Annual Report on Form 10-K...................  For the Year ended December 31, 1998 (as amended on
                                                 March 23, 1999)
Quarterly Reports on Form 10-Q...............  Form 10-Q/A filed on January 8, 1999
Current Reports on Form 8-K..................  January 8, 1999, January 27, 1999, March 9, 1999,
                                               March 10, 1999 and March 22, 1999
Proxy Statements.............................  Filed on January 8, 1999 (including the description of
                                               AT&T capital stock included therein) and March 19,
                                                 1999
</TABLE>
 
<TABLE>
<CAPTION>
VANGUARD SEC FILINGS (FILE NO. 0-16560)                                PERIOD
- ---------------------------------------                                ------
<S>                                            <C>
Annual Report on Form 10-K...................  For the Year ended December 31, 1997 (as amended on
                                                 April 15, 1998, June 30, 1998, March 23, 1999 and
                                                 March 24, 1999)
Quarterly Reports on Form 10-Q...............  For the Quarters ended March 31, 1998, June 30, 1998
                                               and September 30, 1998
Current Reports on Form 8-K..................  Filed on July 13, 1998, October 13, 1998, October 15,
                                               1998, November 9, 1998, December 4, 1998 and December
                                                 31, 1998
Proxy Statement..............................  Dated April 20, 1998
 
</TABLE>
 
                                       76
<PAGE>   82
 
<TABLE>
<CAPTION>
TCI SEC FILING (FILE NO. 0-20421)                                      PERIOD
- ---------------------------------                                      ------
<S>                                            <C>
Financial Statements and Management's
  Discussion and Analysis of Financial
  Condition and Results of Operations as of
  and for the nine months ended September 30,
  1998 and 1997 for Tele-Communications, Inc.
  and Liberty/ Ventures Group contained in
  the Current Report on Form 8-K.............  Filed on January 7, 1999 (as amended on January 11,
                                               1999)
</TABLE>
 
     AT&T and Vanguard also incorporate by reference into this Proxy
Statement/Prospectus additional documents that may be filed with the SEC from
the date of this Proxy Statement/ Prospectus to the date of the Special Meeting.
These include periodic reports, such as Annual Reports on Form 10-K, Quarterly
Reports on Form 10-Q, and Current Reports on Form 8-K, as well as proxy
statements.
 
     AT&T has supplied all information contained or incorporated by reference in
this Proxy Statement/Prospectus relating to AT&T and Vanguard has supplied all
such information relating to Vanguard.
 
     If you are a shareholder, we may have sent you some of the documents
incorporated by reference, but you can obtain any of them through us, the SEC or
the SEC's Internet world wide web site as described above. Documents
incorporated by reference are available from us without charge, excluding all
exhibits unless we have specifically incorporated by reference an exhibit in
this Proxy Statement/Prospectus. Shareholders may obtain documents incorporated
by reference in this Proxy Statement/Prospectus by requesting them in writing or
by telephone from the appropriate company at the following addresses:
 
<TABLE>
<S>                                             <C>
                 AT&T Corp.                           Vanguard Cellular Systems, Inc.
         32 Avenue of the Americas                   2002 Pisgah Church Road, Suite 300
          New York, NY 10013-2412                        Greensboro, NC 27455-3314
            Tel: (212) 387-5400                             Tel: (336) 282-3690
   Attn: Corporate Secretary's Department          Attn: Corporate Secretary's Department
</TABLE>
 
     If you would like to request documents from us, please do so by April 18,
1999 to receive them before the Special Meeting.
 
     YOU SHOULD RELY ONLY ON THE PROXY CONTAINED OR INCORPORATED BY REFERENCE IN
THIS PROXY STATEMENT/PROSPECTUS. WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU
WITH INFORMATION THAT IS DIFFERENT FROM WHAT IS CONTAINED IN THIS PROXY
STATEMENT/PROSPECTUS. THIS PROXY STATEMENT/ PROSPECTUS IS DATED MARCH 26, 1999.
YOU SHOULD NOT ASSUME THAT THE INFORMATION CONTAINED IN THIS PROXY
STATEMENT/PROSPECTUS IS ACCURATE AS OF ANY DATE OTHER THAN THAT DATE. NEITHER
THE MAILING OF THIS PROXY STATEMENT/PROSPECTUS TO VANGUARD SHAREHOLDERS NOR THE
ISSUANCE OF AT&T SHARES IN THE MERGER CREATES ANY IMPLICATION TO THE CONTRARY.
 
                                       77
<PAGE>   83
 
                             LIST OF DEFINED TERMS
 
<TABLE>
<CAPTION>
TERM                                  PAGE
- ----                                  ----
<S>                                   <C>
Acquisition Proposal................   50
ARPU................................   25
Articles of Merger..................   29
AT&T Required Regulatory
  Approvals.........................   53
AT&T Shares.........................   15
Bankruptcy Case.....................   37
Base Case...........................   25
CAGR................................   25
Cash Election.......................   42
Cash Fraction.......................   43
Certificate of Merger...............   29
Certificates........................   39
Charitable Trust and Family
  Foundation Shareholders...........   60
Charitable Trust and Family
  Foundation Shareholders'
  Options...........................   60
Charitable Trust and Family
  Foundation Voting Agreements......   60
Closing Date........................   42
Code................................   24
Comparable Companies................   27
Dissenters' Notice..................   39
Dissenters' Rights..................   39
Dissenting Shares...................   20
EBITDA..............................   21
Effective Time......................   29
Election............................   42
Election Deadline...................   45
Exchange Agent......................   45
Executive Loan Letter Agreement.....   60
Executive Loan Program..............   60
Extension Conditions................   54
Fairness Opinion....................   23
FCC.................................   16
Form of Election....................   17
Guarantee of Delivery...............   45
IWCH................................   36
High Case...........................   25
Long Term Plan......................   34
Low Case............................   25
</TABLE>
 
<TABLE>
<CAPTION>
TERM                                  PAGE
- ----                                  ----
<S>                                   <C>
Merger..............................   17
Merger Agreement....................   17
Merger Consideration................   20
Merger Proposal.....................   17
Merger Sub..........................   16
NCBCA...............................   64
Non-Election........................   42
Non-Election Fraction...............   44
Non-Employee Directors..............   36
NYBCL...............................   64
Options.............................   35
Outside Date........................   54
Per Share Cash Amount...............   20
Per Share Stock Amount..............   20
Plan................................   37
POPs................................   16
Proposed Amendments.................   33
Purchase Event......................   58
Record Date.........................   17
Registration Statement..............   76
Representative......................   43
Required Vanguard Vote..............   17
Richardson Family...................   61
Senior Executives...................   35
Shareholder's Option................   59
Shareholders........................   59
Stipulation.........................   38
Stock Election......................   42
Stock Fraction......................   43
Superior Proposal...................   50
Tax Reimbursement Amounts...........   34
Terminating AT&T Breach.............   55
Vanguard Founders...................   34
Vanguard-held Shares................   20
Vanguard Option.....................   58
Vanguard Option Agreement...........   58
Vanguard Paging Business............   36
Vanguard Required Regulatory
  Approvals.........................   52
Vanguard Stock Option Plans.........   35
Voting Agreements...................   59
</TABLE>
 
                                       78
<PAGE>   84
 
                                                                      APPENDIX A
 
                              AMENDED AND RESTATED
                          AGREEMENT AND PLAN OF MERGER
                          DATED AS OF OCTOBER 2, 1998
                                     AMONG
                                  AT&T CORP.,
                                 WINSTON, INC.
                                      AND
                        VANGUARD CELLULAR SYSTEMS, INC.
 
                                       A-1
<PAGE>   85
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                      Page
                                                                      ----
<C>   <S>                                                             <C>
 
                                ARTICLE I.
                              PLAN OF MERGER
1.1   The Merger..................................................     A-5
1.2   Effective Time..............................................     A-5
1.3   Effects of the Merger.......................................     A-5
1.4   Certificate of Incorporation................................     A-5
1.5   By-Laws.....................................................     A-5
1.6   Directors and Officers of Surviving Corporation.............     A-5
1.7   Effect on Capital Stock.....................................     A-5
1.8   Adjustment of Merger Consideration..........................     A-9
1.9   No Further Ownership Rights in Company Common Stock.........    A-10
1.10  No Fractional Shares........................................    A-10
1.11  Shares of Dissenting Shareholders...........................    A-10
1.12  Company Options.............................................    A-10
 
                               ARTICLE II.
                         EXCHANGE OF CERTIFICATES
2.1   Closing.....................................................    A-11
2.2   Exchange Agent..............................................    A-11
2.3   Exchange and Payment Procedures.............................    A-11
2.4   Distributions with Respect to Unexchanged Shares............    A-12
2.5   Termination of Exchange Fund................................    A-12
2.6   No Liability................................................    A-12
2.7   Lost Certificates...........................................    A-13
2.8   Withholding Rights..........................................    A-13
2.9   Further Assurances..........................................    A-13
2.10  Stock Transfer Books........................................    A-13
 
                               ARTICLE III.
                      REPRESENTATIONS AND WARRANTIES
3.1   Representations and Warranties of the Company...............    A-13
3.2   Joint and Several Representations and Warranties of Parent      A-24
      and Merger Sub..............................................
 
                               ARTICLE IV.
                COVENANTS RELATING TO CONDUCT OF BUSINESS
4.1   Covenants of the Company....................................    A-27
4.2   Reasonable Efforts..........................................    A-30
4.3   NYSE Listing................................................    A-30
4.4   Advice of Changes; Government Filings.......................    A-30
4.5   Control of Other Party's Business...........................    A-31
</TABLE>
 
                                       A-2
<PAGE>   86
 
<TABLE>
<CAPTION>
                                                                      Page
                                                                      ----
<C>   <S>                                                             <C>
                               ARTICLE V.
                          ADDITIONAL AGREEMENTS
5.1   Preparation of Proxy Statement/Registration; Company            A-31
      Shareholder Meeting.........................................
5.2   Access to Information.......................................    A-32
5.3   Approvals and Consents; Cooperation.........................    A-32
5.4   Acquisition Proposals.......................................    A-33
5.5   Employee Benefits...........................................    A-34
5.6   Fees and Expenses...........................................    A-34
5.7   Indemnification; Directors' and Officers' Insurance.........    A-35
5.8   Public Announcements........................................    A-35
5.9   Debentures..................................................    A-35
5.10  Affiliate Letters...........................................    A-36
5.11  Year 2000 Compliance........................................    A-36
                               ARTICLE VI.
                           CONDITIONS PRECEDENT
6.1   Conditions to Each Party's Obligation to Effect the             A-36
      Merger......................................................
6.2   Additional Conditions to Obligations of Parent and Merger       A-37
      Sub.........................................................
6.3   Additional Conditions to Obligations of the Company.........    A-39
 
                               ARTICLE VII.
                        TERMINATION AND AMENDMENT
7.1   Termination.................................................    A-39
7.2   Effect of Termination.......................................    A-41
7.3   Amendment...................................................    A-42
7.4   Extension; Waiver...........................................    A-42
 
                              ARTICLE VIII.
                            GENERAL PROVISIONS
8.1   No Survival of Representations, Warranties and Agreements...    A-43
8.2   Notices.....................................................    A-43
8.3   Interpretation..............................................    A-43
8.4   Counterparts................................................    A-43
8.5   Entire Agreement; No Third Party Beneficiaries..............    A-43
8.6   Governing Law...............................................    A-44
8.7   Severability................................................    A-44
8.8   Assignment..................................................    A-44
8.9   Enforcement.................................................    A-44
8.10  Definitions.................................................    A-44
</TABLE>
 
                                       A-3
<PAGE>   87
 
     AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER, dated as of October 2,
1998 (the "Agreement"), by and among AT&T Corp., a New York corporation
("Parent"), Winston, Inc., a Delaware corporation and a wholly owned subsidiary
of Parent ("Merger Sub"), and Vanguard Cellular Systems, Inc., a North Carolina
corporation (the "Company", and together with Parent and Merger Sub, the
"Parties").
 
                              W I T N E S S E T H.
 
     WHEREAS, the Parties entered into an Agreement and Plan of Merger, dated as
of October 2, 1998 (the "Original Merger Agreement");
 
     WHEREAS, the Parties entered into an Amendment No. 1 to the Original Merger
Agreement, dated as of November 4, 1998 (the "Amendment No. 1");
 
     WHEREAS, the Parties desire to set forth an amended and restated agreement
and plan of merger incorporating the Original Merger Agreement, as amended by
Amendment No. 1, and to further clarify certain of the provisions contained in
the Original Merger Agreement, as amended;
 
     WHEREAS, the Parties desire that the provisions of this Agreement shall be
effective as of the date of the Original Merger Agreement;
 
     WHEREAS, the respective Boards of Directors of Parent, Merger Sub and the
Company have each determined that the Merger is in the best interests of their
respective shareholders and have approved the Merger upon the terms and subject
to the conditions set forth in this Agreement, whereby each issued and
outstanding share of Class A Common Stock, par value $.01 per share, of the
Company ("Company Common Stock"), other than shares owned directly or indirectly
by the Company, will be converted into the right to receive the consideration
set forth herein;
 
     WHEREAS, in order to effectuate the foregoing, the Company, upon the terms
and subject to the conditions of this Agreement and in accordance with the
Business Corporation Act of the State of North Carolina, will merge with and
into Merger Sub in a merger in which Merger Sub shall be the surviving
corporation;
 
     WHEREAS, for federal income tax purposes, it is intended that the Merger
qualify as a reorganization within the meaning of Section 368(a) of the Internal
Revenue Code of 1986, as amended (the "Code");
 
     WHEREAS, Parent has requested, and the Company has agreed, as a condition
to Parent's willingness to enter into this Agreement, that the Company enter
into that certain Option Agreement, dated as of the date hereof and attached
hereto as Annex A (the "Option Agreement");
 
     WHEREAS, Parent has requested, and the certain stockholders of the Company
have agreed, as a condition to Parent's willingness to enter into this
Agreement, that certain stockholders of the Company enter into those certain
Voting and Option Agreements dated as of the date hereof and attached hereto as
Annex B ("Voting Agreements"); and
 
     WHEREAS, Parent, Merger Sub and the Company desire to make certain
representations, warranties, covenants and agreements in connection with the
Merger and also to prescribe various conditions to the Merger.
 
                                       A-4
<PAGE>   88
 
     NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth herein, and
intending to be legally bound hereby, the parties hereto agree as follows:
 
                                   ARTICLE I.
 
                                 PLAN OF MERGER
 
     1.1  The Merger.  In accordance with the North Carolina Business
Corporation Act (the "NCBCA") and the Delaware General Corporation Law (the
"DGCL"), the Company shall be merged with and into Winston, Inc., a Delaware
corporation and wholly owned subsidiary of Parent ("Merger Sub") (the "Merger").
Following the Merger, the separate corporate existence of the Company shall
cease and Merger Sub shall continue as the surviving corporation (the "Surviving
Corporation") in accordance with Section 55-11-07 of the NCBCA and Section 252
of the DGCL.
 
     1.2  Effective Time.  The Merger shall become effective when (i) articles
of merger (the "Articles of Merger") are filed with the Secretary of State of
North Carolina in such form as is required by and executed in accordance with
Section 55-11-05 of the NCBCA and a certificate of merger (a "Certificate of
Merger") is filed with the Secretary of State of Delaware in accordance with
Sections 251 and 252 of the DGCL or (ii) such other time as Parent and the
Company shall agree in writing should be specified in the Articles of Merger
(the date and time the Merger becomes effective being the "Effective Time").
 
     1.3  Effects of the Merger.  At and after the Effective Time, the Merger
will have the effects set forth in Section 55-11-06 of the NCBCA and Section 259
of the DGCL. Without limiting the generality of the foregoing, and subject
thereto, at the Effective Time all the property, rights, privileges, powers and
franchises of the Company and Merger Sub shall be vested in the Surviving
Corporation, and all debts, liabilities and duties of the Company and Merger Sub
shall become the debts, liabilities and duties of the Surviving Corporation.
 
     1.4  Certificate of Incorporation.  The certificate of incorporation of
Merger Sub in effect immediately prior to the Effective Time shall be the
certificate of incorporation of the Surviving Corporation until thereafter
changed or amended as provided therein or by applicable law.
 
     1.5  By-Laws.  The by-laws of Merger Sub in effect at the Effective Time
shall be the by-laws of the Surviving Corporation until thereafter changed or
amended as provided therein or by applicable law.
 
     1.6  Directors and Officers of Surviving Corporation.  The directors and
officers of Merger Sub shall be the directors and officers, respectively, of the
Surviving Corporation, until the earlier of their resignation or removal or
otherwise ceasing to be a director or officer, as the case may be, or until
their respective successors are duly elected and qualified, as the case may be.
 
     1.7  Effect on Capital Stock.  As of the Effective Time, by virtue of the
Merger and without any action on the part of the holders of any shares of the
Company's Class A Company Common Stock, par value $.01 per share (the "Company
Common Stock"):
 
          (a) Cancellation of Stock.  Each share of Company Common Stock that is
     owned by the Company or any wholly owned subsidiary of the Company (as
     treasury stock or otherwise) shall automatically be cancelled and retired
     and shall cease to exist and no consideration shall be delivered in
     exchange therefor.
 
          (b) Consideration for Company Common Stock.  Subject to Section 1.11,
     each issued and outstanding share of Company Common Stock (other than
     Dissenting Shares and shares to be cancelled in accordance with Section
     1.7(a)) shall be converted into either (i) the right to
 
                                       A-5
<PAGE>   89
 
     receive 0.3987 fully paid and nonassessable shares of common stock, par
     value $1.00 per share, of Parent ("Parent Common Stock") (the "Per Share
     Stock Amount"), or (ii) the right to receive $23.00 in cash, without
     interest (the "Per Share Cash Amount"), or (iii) a combination of shares of
     Parent Common Stock and cash, each as determined in accordance with Section
     1.7(f), Section 1.7(g) or Section 1.7(h). As of the Effective Time, all
     such shares of Company Common Stock shall no longer be outstanding and
     shall automatically be cancelled and retired and shall cease to exist, and
     each holder of a certificate representing any such shares of Company Common
     Stock shall cease to have any rights with respect thereto, except the right
     to receive, upon surrender of such certificate in accordance with Section
     2.3, the Per Share Stock Amount, the Per Share Cash Amount or a combination
     of cash and Parent Common Stock, each in accordance with this Section 1.7.
     The consideration to be received in the Merger under this Article for one
     share of Company Common Stock shall be referred to herein as the "Merger
     Consideration."
 
          (c) Merger Sub Capital Stock.  Each share of capital stock of Merger
     Sub issued and outstanding immediately prior to the Effective Time shall
     remain outstanding and shall be unchanged as a share of capital stock of
     the Surviving Corporation.
 
          (d) The aggregate number of shares of Company Common Stock which may
     be converted into the right to receive cash in the Merger shall be equal to
     50% of the number of shares of Company Common Stock outstanding immediately
     prior to the Effective Time (other than Dissenting Shares and shares to be
     cancelled in accordance with Section 1.7(a)). The aggregate number of
     shares of Company Common Stock which may be converted into the right to
     receive Parent Common Stock in the Merger shall be equal to 50% of the
     number of shares of Company Common Stock outstanding immediately prior to
     the Effective Time (other than Dissenting Shares and shares to be cancelled
     in accordance with Section 1.7(a)).
 
          (e) Subject to the allocation and election procedures set forth in
     this Section 1.7 (which allocation procedures shall be calculated as of
     immediately prior to the Effective Time), each record holder (or beneficial
     owner through appropriate and customary documentation and instructions)
     immediately prior to the Effective Time of shares of Company Common Stock
     shall be entitled either (i) to elect to receive the Per Share Cash Amount
     for each such share of Company Common Stock (a "Cash Election"), or (ii) to
     elect to receive the Per Share Stock Amount for each such share of Company
     Common Stock (a "Stock Election"), or (iii) to indicate that such record
     holder has no preference as to the receipt of cash, Parent Common Stock or
     a combination thereof with respect to such holder's shares of Company
     Common Stock (a "Non-Election", and any Cash Election, Stock Election or
     Non-Election shall be referred to herein as an "Election"); provided,
     however, that no holder of Dissenting Shares shall be entitled to make an
     Election. All such elections shall be made on a form furnished by Parent
     for that purpose (a "Form of Election") and reasonably satisfactory to the
     Company. If more than one certificate which immediately prior to the
     Effective Time represented outstanding shares of Company Common Stock (a
     "Certificate") shall be surrendered for the account of the same holder, the
     number of shares of Parent Common Stock, if any, to be issued to such
     holder in exchange for the Certificates which have been surrendered shall
     be computed on the basis of the aggregate number of shares of Company
     Common Stock represented by all of the Certificates surrendered for the
     account of such holder. Holders of record of shares of Company Common Stock
     who hold such shares of Company Common Stock as nominees, trustees or in
     other representative capacities (each, a "Representative") may submit
     multiple Forms of Election, provided that such Representative certifies
     that each such Form of Election covers all shares of Company Common Stock
     held by such Representative for a particular beneficial owner.
 
                                       A-6
<PAGE>   90
 
          (f) If the aggregate number of shares of Company Common Stock with
     respect to which Cash Elections have been made exceeds the aggregate number
     of shares of Company Common Stock which may be converted into the right to
     receive cash in the Merger, then:
 
             A.  Each share of Company Common Stock with respect to which a
        Stock Election shall have been made shall be converted into the right to
        receive the Per Share Stock Amount;
 
             B.  Each share of Company Common Stock with respect to which a
        Non-Election shall have been made (or deemed to have been made) shall be
        converted into the right to receive the Per Share Stock Amount; and
 
             C.  Each share of Company Common Stock with respect to which a Cash
        Election shall have been made shall be converted into the right to
        receive:
 
                (1) the amount in cash, without interest, equal to the product
           of (i) the Per Share Cash Amount and (ii) a fraction (the "Cash
           Fraction"), the numerator of which shall be the aggregate number of
           shares of Company Common Stock which may be converted into the right
           to receive cash in the Merger, and the denominator of which shall be
           the aggregate number of shares of Company Common Stock with respect
           to which Cash Elections shall have been made, and
 
                (2) the number of shares of Parent Common Stock equal to the
           product of (x) the Per Share Stock Amount and (y) a fraction equal to
           one minus the Cash Fraction.
 
          (g) If the aggregate number of shares of Company Common Stock with
     respect to which Stock Elections have been made exceeds the aggregate
     number of shares of Company Common Stock which may be converted into the
     right to receive Parent Common Stock in the Merger, then:
 
             A.  Each share of Company Common Stock with respect to which a Cash
        Election shall have been made shall be converted into the right to
        receive the Per Share Cash Amount;
 
             B.  Each share of Company Common Stock with respect to which a
        Non-Election shall have been made (or deemed to have been made) shall be
        converted into the right to receive the Per Share Cash Amount; and
 
             C.  Each share of Company Common Stock with respect to which a
        Stock Election shall have been made shall be converted into the right to
        receive:
 
                (1) the number of shares of Parent Common Stock equal to the
           product of (i) the Per Share Stock Amount and (ii) a fraction (the
           "Stock Fraction"), the numerator of which shall be the aggregate
           number of shares of Company Common Stock which may be converted into
           the right to receive Parent Common Stock in the Merger, and the
           denominator of which shall be the aggregate number of shares of
           Company Common Stock with respect to which Stock Elections shall have
           been made, and
 
                (2) the amount in cash, without interest, equal to the product
           of (x) the Per Share Cash Amount and (y) a fraction equal to one
           minus the Stock Fraction.
 
          (h) In the event that neither Section 1.7(f) nor Section 1.7(g) above
     is applicable, then:
 
             A.  Each share of Company Common Stock with respect to which a Cash
        Election shall have been made (or deemed to have been made) shall be
        converted into the right to receive the Per Share Cash Amount;
 
                                       A-7
<PAGE>   91
 
               B.  Each share of Company Common Stock with respect to which a
        Stock Election shall have been made (or deemed to have been made) shall
        be converted into the right to receive the Per Share Stock Amount; and
 
               C.  Each share of Company Common Stock with respect to which a
        Non-Election shall have been made (or deemed to have been made), if any,
        shall be converted into the right to receive:
 
                      (1) the amount in cash, without interest, equal to the
                  product of (i) the Per Share Cash Amount and (ii) a fraction
                  (the "Non-Election Fraction"), the numerator of which shall be
                  the excess of the (A) aggregate number of shares of Company
                  Common Stock which may be converted into the right to receive
                  cash in the Merger over (B) the sum of the aggregate number of
                  shares of Company Common Stock with respect to which a Cash
                  Election shall have been made, and the denominator of which
                  shall be the excess of (A) the aggregate number of shares of
                  Company Common Stock outstanding immediately prior to the
                  Effective Time (other than shares to be cancelled in
                  accordance with Section 1.7(a)) over (B) the sum of the
                  aggregate number of shares of Company Common Stock with
                  respect to which a Cash Election and a Stock Election shall
                  have been made plus Dissenting Shares, and
 
                      (2) the number of shares of Parent Common Stock equal to
                  the product of (x) the Per Share Stock Amount and (y) a
                  fraction equal to one minus the Non-Election Fraction.
 
          (i) Elections shall be made by holders of shares of Company Common
     Stock by delivering the Form of Election to the exchange agent. To be
     effective, a Form of Election must be properly completed, signed and
     submitted to the Exchange Agent by no later than 5:00 p.m. (New York City
     time) on the last business day prior to the Company Shareholders Meeting,
     if the Effective Time is reasonably expected by the Company and Parent to
     occur at least three but no more than five business days following such
     Company Shareholders Meeting (the "Election Deadline") (provided that if
     the Effective Time is not reasonably expected to occur at least three but
     no more than five business days following the Company Shareholders Meeting,
     Parent and the Company shall agree to a later date and time, reasonably
     expected to be at least four business days prior to the Effective Time as
     the Election Deadline (and shall reset such date if necessary so that the
     Election Deadline is at least three business days before the Effective
     Time) and shall publish appropriate advance notice of such Election
     Deadline), and accompanied by (1)(x) the Certificates representing the
     shares of Company Common Stock as to which the election is being made or
     (y) an appropriate guarantee of delivery of such Certificates as set forth
     in such Form of Election from a firm which is a member of a registered
     national securities exchange or of the National Association of Securities
     Dealers, Inc. or a commercial bank or trust company having an office or
     correspondent in the United States, provided such Certificates are in fact
     delivered to the Exchange Agent within three New York Stock Exchange
     ("NYSE") trading days after the date of execution of such guarantee of
     delivery (a "Guarantee of Delivery"), and (2) a properly completed and
     signed letter of transmittal. Failure to deliver Certificates covered by
     any Guarantee of Delivery within three NYSE trading days after the date of
     execution of such Guarantee of Delivery shall be deemed to invalidate any
     otherwise properly made Cash Election or Stock Election. Parent will have
     the discretion, which it may delegate in whole or in part to the Exchange
     Agent, to determine whether Forms of Election have been properly completed,
     signed and submitted or revoked and to disregard immaterial defects in
     Forms of Election. The good faith decision of Parent (or the Exchange
     Agent) in such matters shall be conclusive and binding. Neither Parent nor
     the Exchange Agent will be under any
 
                                       A-8
<PAGE>   92
 
     obligation to notify any person of any defect in a Form of Election
     submitted to the Exchange Agent. A Form of Election with respect to
     Dissenting Shares shall not be valid. The Exchange Agent shall also make
     all computations contemplated by this Section 1.7 and all such computations
     shall be conclusive and binding on the holders of shares of Company Common
     Stock in the absence of manifest error. Any Form of Election may be changed
     or revoked prior to the Election Deadline. In the event a Form of Election
     is revoked prior to the Election Deadline, Parent shall, or shall cause the
     Exchange Agent to, cause the Certificates representing the shares of
     Company Common Stock covered by such Form of Election to be promptly
     returned without charge to the person submitting the Form of Election upon
     written request to that effect from such person.
 
          (j) For the purposes hereof, a holder of shares of Company Common
     Stock who does not submit a Form of Election which is received by the
     Exchange Agent prior to the Election Deadline (including a holder who
     submits and then revokes his or her Form of Election and does not resubmit
     a Form of Election which is timely received by the Exchange Agent), or who
     submits a Form of Election without the corresponding Certificates or a
     Guarantee of Delivery, shall be deemed to have made a Non-Election. If any
     Form of Election is defective in any manner such that the Exchange Agent
     cannot reasonably determine the election preference of the shareholder
     submitting such Form of Election, the purported Cash Election or Stock
     Election set forth therein shall be deemed to be of no force and effect and
     the shareholder making such purported Cash Election or Stock Election
     shall, for purposes hereof, be deemed to have made a Non-Election.
 
          (k) A Form of Election and a letter of transmittal shall be included
     with or mailed contemporaneously with each copy of the Proxy Statement
     mailed to shareholders of the Company in connection with the Company
     Meeting. Parent and the Company shall each use its reasonable best efforts
     to mail or otherwise make available the Form of Election and a letter of
     transmittal to all persons who become holders of shares of Company Common
     Stock during the period between the record date for the Company Meeting and
     the Election Deadline.
 
     1.8  Adjustment of Merger Consideration.  In the event that pursuant to a
transaction announced after the date hereof and becoming effective prior to the
Effective Time (i) any distribution is made in respect of Parent Common Stock
other than a regular quarterly cash dividend or (ii) any stock dividend, stock
split, reclassification, recapitalization, combination or mandatory exchange of
shares occurs with respect to, or rights (other than non-mandatory offers to
exchange) are issued in respect of, Parent Common Stock, then, the Per Share
Stock Amount shall be adjusted accordingly. In the event of a dividend or
distribution to all holders of Parent Common Stock of any class of capital stock
of Parent or any Subsidiary of Parent ("Adjustment Shares"), the record date for
which is prior to the Effective Time (it is agreed that the appropriate
adjustment, in addition to the right to receive the Per Share Stock Amount prior
to such adjustment, shall be either, at Parent's option (provided that Parent
shall use reasonable efforts to be able to elect (A) before electing (B)), (A)
the right to receive, at the Effective Time, the number of Adjustment Shares
that such recipient would have received in respect of the Per Share Stock Amount
had such recipient owned the Per Share Stock Amount in Parent Common Stock as of
the date of this Agreement and held such through the Effective Time or and no
further adjustment shall be required under this Section 1.8 for such dividend or
distribution, or (B) the right to receive an amount of Parent Common Stock equal
in market value at the Effective Time to the market value at the Effective Time
of the number of Adjustment Shares that would have been received in respect of
the Per Share Stock Amount had the recipient thereof owned the Per Share Stock
Amount in Parent Common Stock as of the date of this Agreement and held such
through the Effective Time, and no further adjustment shall be required under
this Section 1.8 for such dividend distribution. For the purposes of the prior
sentence, "market value" means, with respect to any securities listed on a
national securities exchange or quoted on an
 
                                       A-9
<PAGE>   93
 
interdealer quotation system, the average of the closing prices on the five
trading days prior to the Effective Time, or if not so listed, the fair market
value of such securities reasonably determined by the Board of Directors of
Parent on such date.
 
     1.9  No Further Ownership Rights in Company Common Stock.  All shares of
Parent Common Stock issued upon the surrender for exchange of Certificates in
accordance with the terms hereof (including any cash paid pursuant to Sections
1.7, 1.10 or 2.4) shall be deemed to have been issued in full satisfaction of
all rights pertaining to such shares of Company Common Stock, and from and after
the Effective Time there shall be no further registration of transfers of the
shares of Company Common Stock which were outstanding immediately prior to the
Effective Time. If, after the Effective Time, Certificates are presented to the
Surviving Corporation for any reason, they shall be cancelled and exchanged as
provided in Article II.
 
     1.10  No Fractional Shares.  No certificate or scrip representing
fractional shares of Parent Common Stock shall be issued upon the surrender for
exchange of Certificates, and such fractional share interests will not entitle
the owner thereof to vote or to any other rights of a stockholder of Parent.
Notwithstanding any other provision of this Agreement, each holder of shares of
Company Common Stock exchanged pursuant to the Merger who would otherwise have
been entitled to receive a fraction of a share of Parent Common Stock (after
taking into account all Certificates delivered by such holder) shall receive, in
lieu thereof, cash (without interest) in an amount equal to such fractional part
of a share of Parent Common Stock multiplied by the Per Share Cash Amount.
 
     1.11  Shares of Dissenting Shareholders.  Notwithstanding anything in this
Agreement to the contrary, any shares of Company Common Stock that are
outstanding immediately prior to the Effective Time and that are held by
shareholders who shall not have voted in favor of the Merger and who shall have
given to the Company (and from whom the Company shall have actually received),
before the vote is taken at the Company Shareholders Meeting to adopt this
Agreement, written notice of such shareholder's intent to demand payment for
such shareholder's shares of Company Common Stock if the Merger is effectuated
in accordance with Article 13 of the NCBCA, and not failed to preserve such
shareholder's right to receive payment for such shares by failing to take those
actions required by such Article 13 within the time periods stipulated therein
(collectively, the "Dissenting Shares") shall not be converted into or represent
the right to receive the Merger Consideration. Such shareholders shall be
entitled to receive the amounts determined in accordance with the provisions of
such Article 13. If, after the Effective Time, any such holder fails to preserve
such rights, such Dissenting Shares shall thereupon be deemed to have been
converted into and to have become exchangeable for, as of the Effective Time,
the right to receive, without any interest thereon, the consideration provided
for in Section 1.7 as if such holder had made a Non-Election. The Company shall
give Parent prompt notice of any notice or demands for payment in accordance
with Article 13 of the NCBCA for shares of Company Common Stock received by the
Company, and Parent shall have the right to direct all proceedings, negotiations
and actions taken by the Company in respect thereof.
 
     1.12  Company Options.  At the Effective Time, each unexpired and
unexercised outstanding option, whether or not then vested or exercisable in
accordance with its terms, to purchase shares of Company Common Stock (the
"Company Options") previously granted by the Company or its Subsidiaries under
the Company's Amended and Restated Stock Compensation Plan, the 1989 Stock Plan
and the Amended and Restated 1994 Long Term Incentive Plan (collectively, the
"Company Stock Option Plans") shall be cancelled and converted into the right to
receive from the Parent, within 10 days following the Effective Time, cash in an
amount equal to the product of (a) the Per Share Cash Amount minus the exercise
price per share of such Company Option, times (b) the number of shares of Common
Stock which may be purchased upon exercise of such Company Option (whether or
not then exercisable). Prior to (but effective at) the Effective Time, the
Company shall
 
                                      A-10
<PAGE>   94
 
use its reasonable best efforts to (i) obtain any consents from all holders of
Company Options and (ii) make any amendments to the terms of such stock option
or compensation plans or arrangements that, in the case of either clause (i) or
(ii), are necessary to give effect to the transactions contemplated by this
Section 1.12. Immediately prior to the Effective Time, the Company shall
terminate the Company Stock Option Plans effective as of the Effective Time.
 
                                  ARTICLE II.
 
                            EXCHANGE OF CERTIFICATES
 
     2.1  Closing.  The closing of the Merger (the "Closing") shall take place
at 8:00 a.m. on the first Business Day after satisfaction or waiver (as
permitted by this Agreement and applicable law) of the conditions (excluding
conditions that, by their terms, cannot be satisfied until the Closing Date) set
forth in Article VI (the "Closing Date") (provided that, if such conditions are
satisfied or waived upon completion of the Company Shareholders Meeting, the
Closing shall take place at least three, but not more than five, business days
thereafter), unless (a) Parent elects a later date (because, in its good faith
judgment, Parent believes that such delay is necessary in connection with
avoiding interference with a material transaction) that is not later than the
Outside Date or (b) another time or date is agreed to in writing by the parties
hereto. The Closing shall be held at the offices of Latham & Watkins, 885 Third
Avenue, Suite 1000, New York, NY 10022-4802, unless another place is agreed to
in writing by the parties hereto. The Articles of Merger and the Certificate of
Merger shall be filed at or as promptly as practicable following the time of the
Closing, and each shall contemplate the same Effective Time.
 
     2.2  Exchange Agent.  As of the Effective Time, Parent shall deposit with
such bank or trust company as may be designated by Parent and be reasonably
acceptable to the Company (the "Exchange Agent") for the benefit of the holders
of shares of Company Common Stock and the holders of the Company Options, for
exchange or payment in accordance with this Section 2.2, through the Exchange
Agent, (i) certificates evidencing such number of shares of Parent Common Stock
equal to (x) the Per Share Stock Amount multiplied by (y) the aggregate number
of shares of Company Common Stock which may be converted into the right to
receive Parent Common Stock in the Merger, and (ii) (1) cash in an amount equal
to (x) the Per Share Cash Amount multiplied by (y) the aggregate number of
shares of Company Common Stock which may be converted into the right to receive
cash in the Merger, and (2) any cash necessary to pay amounts due pursuant to
Section 1.10 and Section 1.12 (such certificates for shares of Parent Common
Stock and such cash being hereinafter referred to as the "Exchange Fund"). The
Exchange Agent shall, pursuant to irrevocable instructions in accordance with
these Articles I and II, deliver the Parent Common Stock and cash contemplated
to be issued pursuant to Section 1.7 out of the Exchange Fund. The Exchange Fund
shall not be used for any other purpose. The Exchange Agent shall invest any
cash included in the Exchange Fund, as directed by Parent, on a daily basis. Any
interest and other income resulting from such investments shall be paid to
Parent.
 
     2.3  Exchange and Payment Procedures.  (a) As soon as reasonably
practicable after the Effective Time, the Exchange Agent shall mail to each
holder of record of a Certificate or Certificates that were converted into the
right to receive shares of Parent Common Stock and/or cash pursuant to Section
1.7(b), (i) a letter of transmittal (which shall specify that delivery shall be
effected, and risk of loss and title to the Certificates shall pass, only upon
proper delivery of the Certificates to the Exchange Agent, and which shall be in
such form and have such other provisions as Parent may reasonably specify) and
(ii) instructions for use in effecting the surrender of the Certificates in
exchange for shares of Parent Common Stock and/or cash. Upon surrender of a
Certificate for cancellation to the Exchange Agent together with such letter of
transmittal, duly executed and completed in accordance with the instructions
thereto, and such other documents as
 
                                      A-11
<PAGE>   95
 
may reasonably be required by the Exchange Agent, the holder of such Certificate
shall be entitled to receive in exchange therefor a certificate representing
that number of whole shares of Parent Common Stock and/or cash which such holder
has the right to receive pursuant to the provisions of Article I and this
Article II and the Certificate so surrendered shall forthwith be cancelled. In
the event of a transfer of ownership of Company Common Stock that is not
registered in the transfer records of the Company, a certificate representing
the proper number of shares of Parent Common Stock and/or cash may be issued to
a Person other than the Person in whose name the Certificate so surrendered is
registered if the Certificate representing such Company Common Stock is
presented to the Exchange Agent, accompanied by all documents required to
evidence and effect such transfer and evidence that any applicable stock
transfer taxes have been paid. Until surrendered as contemplated by this Article
II, each Certificate shall be deemed at any time after the Effective Time to
represent only the right to receive upon surrender the certificate representing
shares of Parent Common Stock and/or cash as contemplated by this Article II.
 
     (b) As soon as reasonably practicable after the Effective Time, but no
later than five business days after the Effective Time, the Company, after
approval by Parent (which approval shall not be unreasonably withheld or
delayed), shall deliver to the Exchange Agent, a list of the holders of the
Company Options, their addresses and the amounts to be paid to each of them.
Promptly after receipt of such list, but no later than three days after receipts
of such list, the Exchange Agent shall pay the amounts shown on such schedule.
 
     2.4  Distributions with Respect to Unexchanged Shares.  No dividends or
other distributions declared or made after the Effective Time with respect to
Parent Common Stock with a record date after the Effective Time shall be paid to
the holder of any unsurrendered Certificate with respect to the shares of Parent
Common Stock to which such holder is entitled hereunder and no cash payment paid
to any such holder pursuant to Sections 1.7 and 1.10 until the holder of record
of such Certificate shall surrender such Certificate. Subject to the effect of
applicable laws, following surrender of any such Certificate, there shall be
given to the record holder of the certificates representing whole shares of
Parent Common Stock to which such holder is entitled hereunder, without
interest, (i) at the time of such surrender, a certificate representing the
number of whole shares of Parent Common Stock and the amount of any cash to
which such holder is entitled pursuant to Sections 1.7 and 1.10 and the amount
of dividends or other distributions with respect to such whole shares of Parent
Common Stock with a record date after the Effective Time and a payment date
prior to their date of issuance to such holder, and (ii) at the appropriate
payment date, the amount of dividends or other distributions with a record date
after the Effective Time but prior to surrender and a payment date subsequent to
surrender payable with respect to such whole shares of Parent Common Stock.
 
     2.5  Termination of Exchange Fund.  Any portion of the Exchange Fund which
remains undistributed to the holders of Certificates for six months after the
Effective Time shall be delivered to Parent, upon demand, and any shareholders
or optionholders of the Company who have not previously complied with the
provisions of this Article II shall thereafter look only to Parent for payment
of their claim for Parent Common Stock and/or cash and any dividends or
distributions with respect to Parent Common Stock. Any portion of the Exchange
Fund remaining unclaimed by holders of Company Common Stock five years after the
Effective Time (or such earlier date immediately prior to such time as such
portion would otherwise escheat to or become property of any Governmental
Entity) shall, to the extent permitted by applicable law, become the property of
the Surviving Corporation free and clear of any claims or interest of any Person
previously entitled therein.
 
     2.6  No Liability.  To the fullest extent permitted by law, none of Parent,
Merger Sub, the Company or the Surviving Corporation shall be liable to any
holder of Company Common Stock or
 
                                      A-12
<PAGE>   96
 
Parent Common Stock, as the case may be, for any shares (or dividends or
distributions with respect thereto) and/or cash delivered to a public official
pursuant to any applicable abandoned property, escheat or similar law.
 
     2.7  Lost Certificates.  If any Certificate shall have been lost, stolen or
destroyed, upon the making of an affidavit of that fact by the Person claiming
such Certificate to be lost, stolen or destroyed and, if required by Parent, the
posting by such Person of a bond in such reasonable amount as Parent may direct
as indemnity against any claim that may be made against it with respect to such
Certificate, the Exchange Agent will deliver in exchange for such lost, stolen
or destroyed Certificate the shares of Parent Common Stock and/or any cash.
 
     2.8  Withholding Rights.  Parent and the Exchange Agent shall be entitled
to deduct and withhold from the consideration otherwise payable pursuant to this
Agreement to any holder of shares of Company Common Stock or holders of Company
Options such amounts as Parent or the Exchange Agent, as applicable, is required
to deduct and withhold with respect to the making of such payment under the
Code, or any provision of state, local or foreign Tax law. To the extent that
amounts are so withheld by Parent or the Exchange Agent, such withheld amounts
shall be treated for all purposes of this Agreement as having been paid to the
holder of the shares of Company Common Stock in respect of which such deduction
and withholding was made by such party.
 
     2.9  Further Assurances.  At and after the Effective Time, the officers and
directors of the Surviving Corporation will be authorized to execute and
deliver, in the name and on behalf of the Company or Merger Sub, any deeds,
bills of sale, assignments or assurances and to take and do, in the name and on
behalf of the Company of Merger Sub, any other actions and things to vest,
perfect or confirm of record or otherwise in the Surviving Corporation any and
all right, title and interest in, to and under any of the rights, properties or
assets acquired or to be acquired by the Surviving Corporation as a result of,
or in connection with, the Merger.
 
     2.10  Stock Transfer Books.  At 5:00 p.m., New York City time, on the day
the Effective Time occurs, the stock transfer books of the Company shall be
closed and there shall be no further registration of transfers of shares of
Company Common Stock thereafter on the records of the Company. From and after
the Effective Time, the holders of Certificates shall cease to have any rights
with respect to such shares of Company Common Stock formerly represented
thereby, except as otherwise provided herein or by law. On or after the
Effective Time, any Certificates presented to the Exchange Agent or Parent for
any reason shall be converted into the Merger Consideration with respect to the
shares of Company Common Stock formerly represented thereby.
 
                                  ARTICLE III.
 
                         REPRESENTATIONS AND WARRANTIES
 
     3.1  Representations and Warranties of the Company.  The Company represents
and warrants to Parent and Merger Sub as follows:
 
          (a) Organization, Standing and Power.  The Company is a corporation
     duly organized and validly existing and in good standing under the laws of
     its jurisdiction of incorporation. Each of the Company's Subsidiaries has
     been duly formed and is validly existing under the laws of the jurisdiction
     of its formation except where the failure of a Subsidiary to be duly formed
     and validly existing in such jurisdictions could not reasonably be
     expected, either individually or in the aggregate, to have a Material
     Adverse Effect on the Company. Each of the Company and its Subsidiaries is
     duly qualified and in good standing to do business in each jurisdiction in
     which the nature of its business or the ownership or leasing of its
     properties makes such qualification necessary, other than, with respect to
     the Subsidiaries, in such jurisdictions where the failure so to qualify
     could not reasonably be expected, either individually or in the aggregate,
     to have a
                                      A-13
<PAGE>   97
 
     Material Adverse Effect on the Company. Each of the Company and its
     Subsidiaries has the requisite corporate power and authority to own, lease
     and operate its properties and conduct its business as currently or
     proposed to be conducted, except, with respect to the Subsidiaries, where
     the lack of such requisite power could not reasonably be expected, either
     individually or in the aggregate, to have a Material Adverse Effect on the
     Company. The Company has previously furnished to Parent true, complete and
     correct copies of the Organizational Documents of the Company and its
     Subsidiaries as in effect on the date of this Agreement, and neither the
     Company nor its Subsidiary is in default thereunder or acting in conflict
     therewith.
 
          (b) Capital Structure.
 
             (i) The authorized capital stock of the Company consists of (A)
        250,000,000 shares of Company Common Stock, of which 36,780,009, shares
        are issued and outstanding as of the date hereof and of which 36,780,009
        shares plus such number of shares as may be issued consistent with
        Section 4.1(b) shall be issued and outstanding as of the Effective Time,
        and no shares are held by the Company or its Subsidiaries as treasury
        stock, (B) 30,000,000 shares of Class B Common Stock, par value $.01 per
        share, of which no shares are issued or outstanding, and (C) 1,000,000
        shares of preferred stock, par value $.01 per share, of which no shares
        are issued or outstanding. All issued and outstanding shares of the
        capital stock of the Company are duly authorized, validly issued, fully
        paid and nonassessable, and no class of capital stock is entitled to
        preemptive rights. Except pursuant to the Option Agreement or as set
        forth on Schedule 3.1(b)(i), there are no outstanding options, warrants
        or other rights to acquire capital stock from the Company (or securities
        convertible into or exchangeable or exercisable for such capital stock)
        other than options representing in the aggregate the right to purchase
        5,987,693 shares of Company Common Stock under the Company Stock Option
        Plans.
 
             (ii) Schedule 3.1(b)(ii) lists all Subsidiaries of the Company as
        of the date of this Agreement. Except as set forth in Schedule
        3.1(b)(ii), (a) all of the issued and outstanding shares of capital
        stock of each Subsidiary of the Company that is a corporation are duly
        authorized, validly issued, fully paid and nonassessable and are owned,
        directly or indirectly, by the Company and where owned by the Company or
        one or more of its Subsidiaries, are owned free and clear of any liens,
        claims, encumbrances, restrictions, preemptive rights, security
        interests, charges, voting and disposition restrictions or any other
        claims of any third party ("Liens"), (b) all capital, membership or
        voting interests of each Subsidiary of the Company that is not a
        corporation have been validly created pursuant to its Organizational
        Documents and, where owned by the Company or one or more of its
        Subsidiaries, are owned, directly or indirectly, by the Company free and
        clear of any Liens and (c) none of the Company or its Subsidiaries has
        any agreement or obligation to provide funds to, or make any investment
        (in the form of a loan, capital contribution or otherwise) in any other
        Person or owns any interests in any Person other than a wholly owned
        Subsidiary (except, as of the Effective Time, as may be agreed or
        allowed consistent with Section 4.1(d)).
 
             (iii) No bonds, debentures, notes or other indebtedness of the
        Company having the right to vote on any matters on which shareholders
        may vote ("Company Voting Debt") are issued or outstanding.
 
             (iv) Schedule 3.1(b)(iv) sets forth a true and complete list as of
        the date hereof of all holders of options to purchase Company Common
        Stock, including the number of shares of Company Common Stock subject to
        each such option, the exercise or vesting schedule, the exercise price
        per share and the term of each such option.
 
                                      A-14
<PAGE>   98
 
             (v) Except as otherwise set forth in the last sentence of Section
        3.1(b)(i) or as set forth in Schedule 3.1(b)(v), there are no
        securities, options, warrants, calls, subscriptions, rights,
        commitments, agreements, arrangements or undertakings of any kind to
        which the Company or any of its Subsidiaries is a party or by which any
        of them is bound obligating the Company or any of its Subsidiaries to
        issue, deliver or sell, or cause to be issued, delivered or sold,
        additional shares of capital stock or other voting securities of the
        Company or any of its Subsidiaries or obligating the Company or any of
        its Subsidiaries to issue, grant, extend or enter into any such
        security, option, warrant, subscriptions, call, right, commitment,
        agreement, arrangement or undertaking. Except as disclosed on Schedule
        3.1(b)(i), there are no outstanding obligations of the Company or any of
        its Subsidiaries to repurchase, redeem or otherwise acquire any shares
        of capital stock of the Company or any of its Subsidiaries.
 
          (c) Authority; No Conflicts.
 
             (i) The Company has all requisite corporate power and authority to
        execute and deliver this Agreement and the Option Agreement and,
        subject, in the case of the consummation of the Merger only, to the
        adoption of this Agreement by the Required Company Vote, to consummate
        the transactions contemplated hereby and thereby (which shall include,
        for all purposes hereunder, without limitation, the making and
        consummation of the Tender Offer (as defined herein) and all
        transactions contemplated thereby, the making of the Deposit (as defined
        herein) and the execution, delivery and performance of the Supplemental
        Indenture (as defined herein)). The execution, delivery and performance
        of this Agreement and the Option Agreement and the consummation of the
        transactions contemplated hereby and thereby have been duly authorized
        by the unanimous vote of the Board of Directors of the Company (at a
        meeting duly called and a quorum being present) and all necessary
        corporate action on the part of the Company, subject, in the case of the
        consummation of the Merger only, to the Required Company Vote. This
        Agreement has been duly executed and delivered by the Company and
        constitutes the legal, valid and binding obligation of the Company,
        enforceable against it in accordance with its terms, except as such
        enforceability may be limited by bankruptcy, insolvency, reorganization,
        moratorium and similar laws relating to or affecting creditors
        generally, by general equity principles (regardless of whether such
        enforceability is considered in a proceeding in equity or at law) or by
        an implied covenant of good faith and fair dealing. The Board of
        Directors of the Company has (i) unanimously approved and adopted this
        Agreement, the Option Agreement and the transactions contemplated hereby
        and thereby and has declared that the Merger and this Agreement and the
        other transactions contemplated hereby are advisable and in the best
        interests of the Company and its shareholders and (ii) unanimously taken
        all action necessary to render inapplicable to the transactions
        contemplated by this Agreement, by the Option Agreement and by the
        Voting Agreement, the provisions of Article VII of the Company's
        Articles of Incorporation and any state anti-takeover or similar law,
        including any such law relating to the voting of shares or a moratorium
        on the consummation of any business combination. The Board of Directors
        of the Company has directed that this Agreement and the transactions
        contemplated hereby be submitted to the holders of the Company Common
        Stock to obtain the Required Company Vote and, subject to the terms
        hereof, has unanimously recommended that such holders vote for approval
        and adoption of this Agreement and the transactions contemplated hereby.
        Neither Article 9 nor Article 9A of Chapter 55 of the General Statutes
        of North Carolina apply to the Company.
 
             (ii) Except as set forth in Schedule 3.1(c)(ii), the execution and
        delivery of this Agreement, the Option Agreement or the Voting
        Agreements does not or will not, as the case may be, and the
        consummation of the transactions contemplated hereby and thereby
 
                                      A-15
<PAGE>   99
 
        will not, conflict with, require any filing, waiver, permit, approval or
        consent under, or result in any violation of, or constitute a default
        (with or without notice or lapse of time, or both) under, or give rise
        to a right of termination, amendment, cancellation or acceleration of
        any obligation or the loss of a material benefit under, or the creation
        of a lien, pledge, security interest, charge or other encumbrance on any
        assets (any such conflict, requirement, violation, default, right of
        termination, amendment, cancellation or acceleration, loss or creation,
        a "Violation") pursuant to: (A) any provision of the Organizational
        Documents of the Company or any of its Subsidiaries and (B) subject to
        obtaining or making the consents, approvals, orders, authorizations,
        registrations, declarations and filings referred to in paragraph (iii)
        below, (x) any Company Material Contract (other than any cell site
        lease) except any such Violations, which individually or in the
        aggregate are not material, or (y) any other contract, agreement or
        binding obligation to which the Company or any Subsidiary is a party or
        to which any of its or their assets are bound, except as could not,
        individually or in the aggregate together with any violations pursuant
        to any Company Material Contract, be reasonably expected to result in a
        Material Adverse Effect on the Company.
 
             (iii) No consent, waiver, permit, approval, order or authorization
        of, or registration, declaration or filing with, any supranational,
        national, state, municipal or local government, any instrumentality,
        subdivision, court, administrative agency or commission or other
        authority thereof, or any quasi-governmental or private body exercising
        any regulatory, taxing, importing or other governmental or
        quasi-governmental authority (a "Governmental Entity") is required by or
        with respect to the Company or any of its Subsidiaries in connection
        with the execution and delivery of this Agreement or the Option
        Agreement by the Company or the consummation by the Company of the
        transactions contemplated hereby or thereby, except for (x) those
        required under or in relation to (A) the Hart-Scott-Rodino Antitrust
        Improvements Act of 1976, as amended (the "HSR Act"), (B) the
        Communications Act of 1934, as amended (the "Communications Act"), and
        any rules and regulations promulgated by the Federal Communications
        Commission ("FCC"), (C) state securities or "blue sky" laws, (D) the
        Securities Act of 1933, as amended (the "Securities Act"), (E) the
        Securities Exchange Act of 1934, as amended ("Exchange Act"), (F) the
        NCBCA with respect to the filing and recordation of appropriate
        documents to effect the Merger, (G) the Public Utilities Commission of
        Ohio, Public Competitive Telecommunications Service Provider, 563
        Registration Form, (H) rules and regulations of any state public service
        or utility commissions or similar state regulatory bodies, (I) rules and
        regulations of the NYSE or Nasdaq National Market ("Nasdaq"), and (J)
        antitrust or other competition laws of other jurisdictions, and (y) such
        consents, approvals, orders, authorizations, registrations, declarations
        and filings the failure of which to make or obtain, excluding those
        which, prior to the Effective Time, have been made or obtained, could
        not reasonably be expected to have a Material Adverse Effect on the
        Company.
 
             (iv) Upon execution and delivery by the Company and the Trustee
        under the Indenture (the "Trustee") of the Supplemental Indenture in
        accordance with the Tender Offer, the Majority Covenants (as defined
        herein) will not apply to the Company or any of its affiliates. The
        Company has reviewed the Supplemental Indenture with its counsel, the
        Trustee and such Trustee's counsel, and is aware of no reason that,
        assuming receipt of the Requisite Consents (as defined herein), the
        Supplemental Indenture would not be executed by the Trustee.
 
                                      A-16
<PAGE>   100
 
          (d) Reports and Financial Statements.
 
             (i) The Company has filed all required reports, schedules, forms,
        statements and other documents required to be filed by it with the
        Securities and Exchange Commission (the "SEC") since January 1, 1996
        (collectively, including all exhibits thereto and documents incorporated
        by reference therein, the "Company SEC Reports"). No Subsidiary of the
        Company is required to file any form, report or other document with the
        SEC. None of the Company SEC Reports, as of their respective dates (and,
        if amended or superseded by a filing prior to the date of this
        Agreement, then on the date of such filing), contained or will contain
        any untrue statement of a material fact or omitted or will 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. Each of the financial statements (including the
        related notes) included in the Company SEC Reports presents fairly, in
        all material respects, the consolidated financial position and
        consolidated results of operations and cash flows of the Company and its
        Subsidiaries as of the respective dates or for the respective periods
        set forth therein, all in conformity with generally accepted accounting
        principles ("GAAP") consistently applied during the periods involved
        except as otherwise noted therein, and subject, in the case of the
        unaudited interim financial statements, to normal and recurring year-end
        adjustments that have not been and are not expected to be material in
        amount. All of such the Company SEC Reports, as of their respective
        dates (and as of the date of any amendment to the respective the Company
        SEC Report), complied as to form in all material respects with the
        applicable requirements of the Securities Act and the Exchange Act and
        the rules and regulations promulgated thereunder.
 
             (ii) Except for, and to the extent of, those liabilities that are
        reflected or reserved against, to the extent reflected or reserved
        against, on the consolidated balance sheet of the Company and its
        Subsidiaries included in the Company's Quarterly Report on Form 10-Q for
        the fiscal period ended June 30, 1998, or the Company's Annual Report on
        Form 10-K for the year ended December 31, 1997, and except for
        liabilities and obligations incurred in the ordinary course of business
        consistent with past practice since June 30, 1998, and except and as to
        the extent disclosed in Schedule 3.1(d)(ii), neither the Company nor any
        of its Subsidiaries has any liabilities or obligations of any nature
        whatsoever (whether fixed, absolute, accrued, contingent or otherwise
        and whether due or to become due) that individually or in the aggregate
        could reasonably be expected to have a Material Adverse Effect on the
        Company.
 
          (e) Proxy Statement/Registration Statement.  The information to be
     supplied by the Company for inclusion in the Registration Statement shall
     not at the time the Registration Statement is filed with or declared
     effective by the SEC or at the date of the Company Shareholders Meeting
     contain any untrue statement of a material fact or omit to state any
     material fact required to be stated in the Registration Statement or
     necessary in order to make the statements in the Registration Statement, in
     light of the circumstances under which they were made, not misleading. The
     Proxy Statement shall not, on the date the Proxy Statement is first mailed
     to shareholders of the Company, at the time of the Company Shareholders'
     Meeting and at the Effective Time, contain any statement which, at such
     time and in light of the circumstances under which it shall be made, is
     false or misleading with respect to any material fact, or omit to state any
     material fact necessary in order to make the statements made in the Proxy
     Statement not false or misleading (excluding any statement based upon
     information supplied by Parent for inclusion in the Proxy Statement).
 
                                      A-17
<PAGE>   101
 
          (f) Compliance with Applicable Laws; Regulatory Matters.  The Company
     and its Subsidiaries hold all permits, licenses, certificates, franchises,
     registrations, variances, exemptions, orders and approvals of all
     Governmental Entities which are necessary or advisable to the operation of
     their businesses, other than those which, individually or in the aggregate,
     the failure to hold could not reasonably be expected to have a Material
     Adverse Effect on the Company (the "Company Permits"). All such Company
     Permits are valid and in full force and effect, and no suspension or
     cancellation of any such Company Permit is pending or, to the knowledge of
     the Company, threatened, except as could not reasonably be expected to,
     individually or in the aggregate, have a Material Adverse Effect on the
     Company. The business of the Company and its Subsidiaries (including,
     without limitation, operation of each Company Benefit Plan) are not being
     and have not been conducted in violation of any law, ordinance, regulation,
     judgment, decree, injunction, rule or order of any Governmental Entity
     ("Law") except for violations that individually or in the aggregate (1)
     would not result in a material penalty or fine, (2) would not constitute a
     material criminal violation, (3) would not result in cognizable damage to
     the business reputation of the Company or the Parent, and (4) which,
     individually or in the aggregate, could not otherwise reasonably be
     expected to have a Material Adverse Effect on the Company. As of the date
     of this Agreement, no investigation by any Governmental Entity with respect
     to the Company or any of its Subsidiaries is pending or, to the knowledge
     of the Company, threatened, other than investigations which, individually
     or in the aggregate, could not reasonably be expected to have a Material
     Adverse Effect on the Company.
 
          (g) Litigation.  Schedule 3.1(g) is a true and complete list of all
     material litigation as of the date hereof that is pending, or to the
     knowledge of the Company, threatened. Other than rulemaking or other
     proceedings of general applicability affecting the cellular telephone
     industry, which would not have a materially disproportionate effect on the
     Company, there is no litigation, arbitration, claim, suit, action,
     investigation or proceeding pending, affecting or, to the knowledge of the
     Company, threatened, against the Company or any of its Subsidiaries or
     their assets, which individually, or except for the matters disclosed in
     Schedule 3.1(g) in the aggregate, as of the date hereof could be reasonably
     expected to result in a material liability, and there is no litigation,
     claim, suit, action, investigation or proceeding pending, affecting or, to
     the knowledge of the Company or any of its Subsidiaries, which
     individually, or in the aggregate could be reasonably expected to result in
     a Material Adverse Effect on the Company. There is no judgment, award,
     decree, injunction, rule or order of any Governmental Entity or arbitrator
     outstanding against the Company or any of its Subsidiaries or their assets,
     which, individually or in the aggregate, as of the date hereof could be
     reasonably expected to result in a material liability, or as of the Closing
     Date, could reasonably be expected to have a Material Adverse Effect on the
     Company.
 
          (h) Taxes.  Except as set forth in Schedules 3.1(h)(i)-(x): (i) the
     Company and each of its Subsidiaries have duly and timely filed (taking
     into account any extension of time within which to file) all Tax Returns
     with respect to material Taxes required to be filed by any of them and all
     such filed Tax Returns are complete and accurate in all respects, except
     for incompletenesses and inaccuracies that could not, individually or in
     the aggregate, be reasonably expected to result in material Tax liability
     that has not been paid; (ii) the Company and each of its Subsidiaries have
     paid all material Tax liabilities that are shown as due on such filed Tax
     Returns or that the Company or any of its Subsidiaries is obligated to
     withhold from amounts owing to any employee, creditor or third party,
     except with respect to matters contested in good faith; (iii) as of the
     date hereof, except as could not individually or in the aggregate be
     reasonably expected to result in material Tax liability that has not been
     paid, and as of the Closing Date, except as could not, individually or in
     the aggregate, reasonably be expected to result in a Material Adverse
     Effect on the Company: (A) there are no pending or, to the
 
                                      A-18
<PAGE>   102
 
     knowledge of the Company, threatened in writing audits, examinations,
     investigations or other proceedings in respect of Taxes or Tax matters
     relating to the Company or any of its Subsidiaries, (B) there are no
     deficiencies or claims for any Taxes that have been proposed, asserted or
     assessed against the Company or any of its Subsidiaries, (C) there are no
     Liens for Taxes upon the assets of the Company or any of its Subsidiaries,
     other than Liens for current Taxes not yet due and payable and Liens for
     Taxes that are being contested in good faith by appropriate proceedings,
     and (D) neither the Company nor any of its Subsidiaries has requested any
     extension of time within which to file any Tax Returns in respect of any
     taxable year which have not since been filed, and no request for waivers of
     the time to assess any Taxes are pending or outstanding; (iv) none of the
     Company or any of its Subsidiaries has made an election under Section
     341(f) of the Code; (v) as of the date hereof, the consolidated federal
     income Tax Returns for the Company and its Subsidiaries have never been
     examined by the Internal Revenue Service; (vi) the net operating loss
     carryforwards ("NOLs") of the Company and its Subsidiaries as of December
     31, 1997 are reasonably expected to equal the amount of NOLs set forth on
     the most recent consolidated federal income Tax Return of the Company and
     its Subsidiaries, and, except for limitations that may apply by reason of
     the Merger or related transactions contemplated by this Agreement, such
     NOLs are not subject to limitation under Section 382 of the Code, Treasury
     Regulation Section 1.1502-15T or -21T or otherwise; (vii) neither the
     Company nor any of its Subsidiaries is a party to any agreement, contract
     or arrangement that could result, on account of the transactions
     contemplated hereunder, separately or in the aggregate, in the payment of
     any "excess parachute payments" within the meaning of Section 280G of the
     Code or any payment that would be nondeductible under Section 162(m) of the
     Code; (viii) neither the Company nor any of its Subsidiaries has any
     liability for Taxes of any person (other than the Company and its
     Subsidiaries) under Treasury Regulation Section 1.1502-6 (or any comparable
     provision of state, local or foreign law); (ix) neither the Company nor any
     Subsidiary is a party to any agreement relating to the allocation or
     sharing of Taxes (other than informal arrangements among the Company and
     its Subsidiaries); and (x) as of the date hereof, neither the Company nor
     any of its Subsidiaries knows of any facts with respect to the Company or
     its Subsidiaries that would reasonably be expected to prevent or materially
     or burdensomely impede the Merger from qualifying as a reorganization
     within the meaning of Section 368(a) of the Code.
 
          (i) Absence of Certain Changes or Events.  Since June 30, 1998 through
     the date of this Agreement, (A) each of the Company and its Subsidiaries
     has conducted its business in the ordinary course consistent with its past
     practice, except for the execution and delivery of this Agreement; (B)
     there has not been any event, development or change of circumstance that
     constitutes, has had, or could reasonably be expected to have, individually
     or in the aggregate, a Material Adverse Effect on the Company; and (C)
     except as disclosed in Schedule 3.1(i)(C), through the date of this
     Agreement, none of the Company or its Subsidiaries has taken or failed to
     take any action which, if taken after the date hereof, would have required
     the consent of Parent under Section 4.1 hereof.
 
          (j) Vote Required.  The affirmative vote of the holders of a majority
     of the outstanding shares of Company Common Stock (the "Required Company
     Vote") is the only vote of the holders of any class or series of the
     Company capital stock necessary to approve this Agreement and the
     transactions contemplated hereby.
 
          (k) Certain Agreements.
 
             (i) Schedule 3.1(k) contains a true and complete list of all
        agreements, arrangements or understandings (a) listed or which would be
        required to be listed as an exhibit to the Company's Annual Report on
        Form 10-K for the year ended December 31, 1997 under the
 
                                      A-19
<PAGE>   103
 
        rules and regulations of the SEC, (b) relating to indebtedness for money
        borrowed by the Company or any Subsidiary, which individually or in the
        aggregate represent an amount greater than $1,000,000 excluding trade
        credit or payables in the ordinary course of business, (c) creating any
        guarantee or keepwell arrangement or other agreement to be liable for
        the obligations of another Person other than the Company or its wholly
        owned Subsidiaries, (d) providing for payments or the receipt of
        payments or the sale, purchase or exchange of goods or services worth in
        excess of $1,000,000 (or in fact resulting in such payments for 1997),
        (e) with any agent/dealer/retailer for the Company's products or
        services, (f) any joint venture or partnership agreement, (g) with any
        paging enterprise for the reselling of products or services, (h) which
        is an interest rate, equity or other swap or derivative instrument, (i)
        containing any provision or covenant limiting the ability of the Company
        or its Subsidiaries or any of its or their affiliates to sell any
        products or services of or to any other person, engage in any line of
        business or compete with or to obtain products or services from any
        person or limiting the ability of any person to provide products or
        services to the Company or any of its Subsidiaries or affiliates and (j)
        cell site leases (collectively, the "Company Material Contracts"). The
        Company has previously provided Parent with true and correct copies of
        each of the Company Material Contracts, as in effect on the date hereof.
 
             (ii) All Company Material Contracts are valid and enforceable and
        in full force and effect except to the extent they have previously
        expired in accordance with their terms, and neither the Company nor any
        of its Subsidiaries has violated any provision of, or committed or
        failed to perform any act which, with or without notice, lapse of time,
        or both, could reasonably be expected to constitute a default under the
        provisions of, any such Company Material Contract, except for any
        invalidity, unenforceability or defaults which, individually or in the
        aggregate, could not reasonably be expected to have a Material Adverse
        Effect on the Company. To the knowledge of the Company, no counterparty
        to any such Company Material Contract has violated any provision of, or
        committed or failed to perform any act which, with or without notice,
        lapse of time, or both, could reasonably be expected to constitute a
        default or other breach under the provisions of, such the Company
        Material Contract, except for defaults or breaches which, individually
        or in the aggregate, could not reasonably be expected to have a Material
        Adverse Effect on the Company. The Company has no obligations under that
        certain Joint Venture Agreement, dated as of January 19, 1990, as
        amended.
 
          (l) Employee Benefit Plans; Labor Matters; Options.
 
             (i) For purposes of this Agreement, the following definitions
        apply: "Controlled Group Liability" means any and all liabilities under
        (A) Title IV of ERISA, (B) section 302 of ERISA, (C) sections 412 and
        4971 of the Code, (D) the continuation coverage requirements of section
        601 et seq. of ERISA and section 4980B of the Code, and (E)
        corresponding or similar provisions of foreign laws or regulations,
        other than such liabilities that arise solely out of, or relate solely
        to, the Plans; "ERISA" means the Employee Retirement Income Security Act
        of 1974, as amended, and the regulations thereunder; "ERISA Affiliate"
        means, with respect to any entity, trade or business, any other entity,
        trade or business that is a member of a group described in Section
        414(b), (c), (m) or (o) of the Code or Section 4001(b)(1) of ERISA that
        includes the first entity, trade or business, or that is a member of the
        same "controlled group" as the first entity, trade or business pursuant
        to Section 4001(a)(14) of ERISA.
 
             (ii) With respect to each employee benefit plan, program,
        arrangement and contract (including, without limitation, any "employee
        benefit plan," as defined in Section 3(3) of
 
                                      A-20
<PAGE>   104
 
        ERISA and any bonus, deferred compensation, stock bonus, stock purchase,
        restricted stock, stock option, employment, termination, change in
        control and severance plan, program, arrangement and contract), to which
        the Company or any of its Subsidiaries is a party, which is maintained
        or contributed to by the Company or any of its Subsidiaries, or with
        respect to which the Company or any of its Subsidiaries could incur
        material liability under Section 4069, 4201 or 4212(c) of ERISA (the
        "Company Benefit Plans"), the Company has made available to Parent a
        true and complete copy of (A) such Company Benefit Plan, (B) the most
        recent annual report (Form 5500) filed with the Internal Revenue Service
        (the "IRS"), (C) each trust or other funding arrangement relating to
        such Company Benefit Plan, (D) the most recent summary plan description
        related to each Company Benefit Plan for which a summary plan
        description is required, (E) the most recent actuarial report (if
        applicable) relating to a Company Benefit Plan and (F) the most recent
        determination letter, if any, issued by the IRS with respect to any
        Company Benefit Plan qualified under Section 401(a) of the Code.
        Schedule 3.1(l) of the Company Disclosure Schedule sets forth a true and
        complete list of Company Benefit Plans.
 
             (iii) Each of the Company Benefit Plans that is an "employee
        pension benefit plan" within the meaning of Section 3(2) of ERISA and
        that is intended to be qualified under Section 401(a) of the Code has
        received a favorable determination letter from the IRS, and the Company
        is not aware of any circumstances likely to result in the revocation of
        any such favorable determination letter that could reasonably be
        expected to have a Material Adverse Effect on the Company.
 
             (iv) All contributions, except for contributions which are not,
        individually or in the aggregate, material, required to be made to any
        Company Benefit Plan by applicable law have been timely made.
 
             (v) The Company does not maintain or contribute to any Company
        Benefit Plan that is subject to Title IV or Section 302 of ERISA or
        Sections 412 or 4971 of the Code.
 
             (vi) There does not now exist, nor do any circumstances exist that
        could result in, any Controlled Group Liability that would be a material
        liability to the Company following the Effective Date.
 
             (vii) The Company has no material liability for life, health,
        medical or other welfare benefits to former employees or beneficiaries
        or dependents thereof, except for health continuation coverage as
        required by Section 4980B of the Code or Part 6 of Title I of ERISA and
        at no expense to the Company.
 
             (viii) No Company Benefit Plan covers foreign employees, other than
        resident aliens.
 
             (ix) No Company Benefit Plan provides for the reimbursement of any
        excise taxes under Section 4999 of the Code or any income taxes under
        the Code.
 
             (x) As of the date hereof, to the knowledge of the Company there
        are no actions, proceedings, arbitrations, suits or claims (other than
        claims for benefits) pending or threatened with respect to any Company
        Benefit Plan.
 
             (xi) With respect to the Company Benefit Plans, no event has
        occurred and, to the knowledge of the Company, there exists no condition
        or set of circumstances, in connection with which the Company or any of
        its Subsidiaries could be subject to any material liability under the
        terms of such Company Benefit Plans, ERISA, the Code or any other
        applicable law (other than ordinary course liabilities to fund such
        Company Benefit Plans pursuant to their terms).
 
                                      A-21
<PAGE>   105
 
             (xii) None of the Company or its Subsidiaries is a party to any
        collective bargaining or other labor union contracts, no collective
        bargaining agreement is being negotiated by the Company or any of its
        Subsidiaries, and as of the date hereof to the knowledge of the Company
        no campaign or other attempt for recognition has been made by any labor
        organization or employee with respect to employees of the Company and to
        the knowledge of the Company at the date hereof, no such campaign or
        other attempt has been threatened or made in the past three years. As of
        the date hereof, there is no pending labor dispute, strike or work
        stoppage against the Company or any of its Subsidiaries which may
        interfere in any material respect with the respective business
        activities of the Company or any of its Subsidiaries. There is no
        material pending charge or complaint against the Company or any of its
        Subsidiaries by the National Labor Relations Board or any comparable
        state agency.
 
             (xiii) Except as set forth in Schedule 3.1(l)(xiii), all employment
        and consulting agreements to which the Company is a party have been made
        available to Parent, and as of the date hereof there are no other
        written agreements obligating the Company to employ any individual.
 
             (xiv) At the Effective Time, any outstanding Company Options will
        be exercisable only for cash or the Merger Consideration and not for
        capital stock of the Company or Merger Sub.
 
          (m) Brokers or Finders.  No agent, broker, investment banker,
     financial advisor or other firm or Person engaged by the Company or any of
     its Affiliates is or will be entitled to any broker's or finder's fee or
     any other similar commission or fee in connection with any of the
     transactions contemplated by this Agreement from the Company or any
     Subsidiary, except Wasserstein Perella & Co., Inc. and, if the Company
     makes the election in Section 5.9(a), NationsBanc Montgomery Securities,
     LLC. A true and complete copy of the engagement letter of Wasserstein
     Perella & Co., Inc. has been delivered to Parent prior to the date hereof,
     and a true and complete copy of the engagement letter of NationsBanc
     Montgomery Securities LLC in the form attached to Schedule 5.9 shall have
     been delivered to Parent prior to the commencement of the Tender Offer if
     the Company makes the election in Section 5.9(a).
 
          (n) Opinion of Financial Advisor.  The Company has received the
     opinion of Wasserstein Perella & Co., Inc. dated the date of this Agreement
     to the effect that, as of such date, the Merger Consideration is fair, from
     a financial point of view, to the holders of Company Common Stock.
 
          (o) Year 2000 Compliance.  The Company has taken steps (summarized in
     Schedule 3.1(o)) that are reasonable to ensure that the occurrence of the
     year 2000 will not materially and adversely affect the information and
     business systems of the Company or the Subsidiaries, and no expenditures in
     excess of currently budgeted items will be required in order to cause such
     systems to operate properly following the change of the year 1999 to 2000.
     The Company has taken the actions described in such Schedule (to the extent
     described therein), has resolved (or is in the process of resolving) any
     issues arising as a result of tests taken or otherwise to the knowledge of
     the Company, and is not aware of any fact that would lead one to reasonably
     conclude that the Company will be unable to resolve any of such issues on
     the timetable set forth in Schedule 3.1(o) (and in any event on a timely
     basis in order to be resolved before the year 2000).
 
          (p) Affiliated Transactions and Certain Other Agreements.  Set forth
     in Schedule 3.1(p) is a list of (a) all contracts, arrangements, agreements
     or understandings that would be required to be described pursuant to Item
     404 of Regulation S-K of the Securities Act of 1933, as amended, except for
     those contracts, arrangements, agreements or understandings disclosed in
     the
 
                                      A-22
<PAGE>   106
 
     Company's 1998 Proxy Statement or Annual Report on Form 10-K for the year
     ended December 31, 1997, and (b) all agreements or understandings, whether
     written or oral, giving any Person the right to require the Company to
     register shares of capital stock or to participate in any such
     registration. The Company has previously provided to Parent true and
     complete copies of each of the foregoing agreements.
 
          (q) Environmental Matters.  Except as disclosed in the Company SEC
     Reports filed prior to the date hereof, and except as could not reasonably
     be expected to result in a Material Adverse Effect on the Company: (i) the
     Company and its Subsidiaries have complied with all applicable
     Environmental Laws; (ii) the properties currently owned or operated by the
     Company and its Subsidiaries (including soils, groundwater, surface water,
     buildings or other structures) are not contaminated with any Hazardous
     Substance to an extent reasonably likely to give rise to liability or
     remediation obligations for the Company or any Subsidiary under any
     applicable Environmental Law; (iii) the properties formerly owned or
     operated by the Company or any of its Subsidiaries were not contaminated
     with any Hazardous Substance during the period of ownership or operation by
     the Company or any of its Subsidiaries to an extent reasonably likely to
     give rise to liability or remediation obligations for the Company or any
     Subsidiary; (iv) neither the Company nor any of its Subsidiaries is
     reasonably likely to be subject to liability or remediation obligations for
     any Hazardous Substance disposal or management or contamination at any
     other property to an extent reasonably likely to give rise to liability or
     remediation obligations for the Company or any Subsidiary under any
     Environmental Laws; (v) neither the Company nor any of its Subsidiaries has
     received any notice, demand, letter, claim or request for information
     indicating that the Company or any of its Subsidiaries may be in violation
     of or subject to liability under any Environmental Law; (vi) neither the
     Company nor any of its Subsidiaries is subject to any orders, decrees,
     injunctions or other arrangements with any Governmental Entity or any
     indemnity or other agreement with any third party relating to any
     Environmental Law or Hazardous Substances; and (vii) there are no other
     circumstances or conditions involving the Company or any of its
     Subsidiaries that could reasonably be expected to result in any claims,
     liability, investigations, costs or restrictions on the ownership, use, or
     transfer of any property of the Company pursuant to any Environmental Law.
     As used herein, the term "Environmental Law" means any federal, state,
     local or foreign law, statute, ordinance, regulation, judgment, order,
     decree, arbitration award, agency requirement, license, permit,
     authorization or common law, relating to the protection, investigation or
     restoration of the environment, health and safety, or natural resources. As
     used herein, the term "Hazardous Substance" means any substance that is:
     (A) a pollutant or contaminant or a hazardous or toxic chemical, waste,
     substance or material, including any petroleum product or by-product,
     asbestos-containing material, lead-containing paint or plumbing,
     polychlorinated biphenyls, radioactive materials or radon; or (B) any other
     substance that may be the subject of regulatory action by any Governmental
     Entity pursuant to any Environmental Law.
 
          (r) Intellectual Property.  The Company and its Subsidiaries own, or
     have the defensible right to use, the Intellectual Property used in their
     respective businesses, except where the failure to own or have the right to
     use such Intellectual Property, individually or in the aggregate, does not
     and would not have a Material Adverse Effect on the Company. As used
     herein, "Intellectual Property" means all industrial and intellectual
     property rights, including Proprietary Technology, patents, patent
     applications, trademarks, trademark applications and registrations, service
     marks, service mark applications and registrations, copyrights, know-how,
     licenses, trade secrets, proprietary processes, formulae and customer
     lists; and "Proprietary Technology" means all proprietary processes,
     formulae, inventions, trade secrets, know-how, development tools and other
     proprietary rights used by the Company and its Subsidiaries pertaining to
     any product, software or service manufactured, marketed, licensed or sold
     by the Company and its
 
                                      A-23
<PAGE>   107
 
     Subsidiaries or Parent and its Subsidiaries, as the case may be, in the
     conduct of their business or used, employed or exploited in the
     development, license, sale, marketing, distribution or maintenance thereof,
     and all documentation and media constituting, describing or relating to the
     above, including manuals, memoranda, know-how, notebooks, software, records
     and disclosures.
 
          (s) Properties.  Schedule 3.1(s) lists all material real property and
     material interests in real property owned by the Company or its
     Subsidiaries or leased by the Company or its Subsidiaries as lessee or
     lessor, as well as all material real property and material interests in
     real property used or held for use as cell sites.
 
          (t) Assets.  All assets of the Company are in good operating condition
     and sufficient for the Company's use thereof, normal wear and tear
     excepted, except where such failure to be in good operating condition could
     not reasonably be expected to result in a Material Adverse Effect. The
     Company owns or has rights to use all assets necessary for the conduct of
     its business and operations or reflected on the balance sheet included in
     the most recent Form 10-Q filed by the Company with the SEC, except where
     the lack of such ownership or rights could not reasonably be expected,
     individually or in the aggregate, to have a Material Adverse Effect on the
     Company.
 
          (u) Insurance.  The Company and its Subsidiaries are insured, and
     shall continue to maintain insurance, in such amounts and against such
     losses and risks as are consistent with industry practice and, in the
     reasonable judgment of senior management of the Company, are adequate to
     protect the properties and business of the Company and its Subsidiaries. As
     of the date hereof, no written notice of cancellation or nonrenewal with
     respect to any material insurance policy has been received by the Company
     or any of its Subsidiaries. Copies of all such insurance policies have been
     furnished or made available to Parent.
 
          (v) Foreign Operations.  Schedule 3.1(v) contains a complete list of
     foreign nations in which the Company has a current investment or operation
     (and the nature of Persons conducting such operations.)
 
          (w) Tender Offer Matters.  The consummation of the transactions
     contemplated by Section 5.9 shall comply with all applicable laws
     including, without limitation, all federal and state securities laws. None
     of the offer to purchase or any of the related materials to be sent or
     delivered by the Company in connection with the Tender Offer shall 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. The supplemental indenture (the "Supplemental Indenture") to be
     entered into in connection with the Tender Offer, upon execution by the
     Company and the Trustee, shall be valid and enforceable and in full force
     and effect, and neither the Company nor any of its Subsidiaries shall
     violate any provision of, or commit or fail to perform any act which, with
     or without notice, lapse of time, or both, could reasonably be expected to
     constitute a default under the provisions of, any such Supplemental
     Indenture.
 
     3.2  Joint and Several Representations and Warranties of Parent and Merger
Sub.  Parent and Merger Sub jointly and severally represent and warrant to the
Company as follows:
 
          (a) Organization, Standing and Power.  Each of Parent and Merger Sub
     is a corporation duly organized and is validly existing and in good
     standing under the laws of the jurisdiction of its incorporation, and has
     the requisite corporate power and corporate authority to own, lease, and
     operate its properties and assets and to carry on its business as it is now
     being conducted. Each of Parent and Merger Sub is duly qualified and in
     good standing to do business in each jurisdiction in which the nature of
     its business or the ownership or leasing of its properties makes such
     qualification necessary, other than in such jurisdictions where the failure
     so to qualify or be
 
                                      A-24
<PAGE>   108
 
     in good standing could not reasonably be expected, individually or in the
     aggregate, to have a Material Adverse Effect on Parent.
 
          (b) Authorization and Execution.  Each of Parent and Merger Sub has
     the requisite corporate power and authority to execute and deliver this
     Agreement and to consummate the transactions contemplated hereby. The
     execution, delivery, and performance by each of Parent and Merger Sub of
     this Agreement have been duly authorized by the Board of Directors of such
     corporation and by Parent as sole stockholder of Merger Sub, and no further
     corporate action of Parent or Merger Sub is necessary to consummate the
     transactions contemplated hereby. Each of Parent and Merger Sub have duly
     executed and delivered this Agreement, and this agreement constitutes the
     legal, valid, and binding obligation of such party enforceable against it
     in accordance with its terms, except as such enforceability may be limited
     by bankruptcy, insolvency, reorganization, moratorium and similar laws
     relating to or affecting creditors generally, by general equity principles
     (regardless of whether such enforceability is considered in a proceeding in
     equity or at law) or by an implied covenant of good faith and fair dealing.
 
          (c) Parent Common Stock.  The shares of Parent Common Stock to be
     issued pursuant to Article I will, when issued, be duly authorized, validly
     issued, fully paid and nonassessable, and no stockholder of Parent is
     entitled to preemptive rights as a result of the issuance of the Parent
     Company Stock hereunder. The Parent Common Stock to be issued in the Merger
     will, when issued, be registered under the Securities Act and the Exchange
     Act and registered or exempt from registration under any applicable state
     securities laws, in each case for delivery hereunder to holders of Company
     Common Stock. The Parent has available for issuance under its Organization
     Documents a sufficient number of shares of authorized Parent Common Stock
     necessary to satisfy Parent's obligations under this Agreement.
 
          (d) No Conflicts.  The execution and delivery of this Agreement does
     not or will not, as the case may be, (i) conflict with or result in a
     breach of the Articles or Certificate of Incorporation, Bylaws or similar
     organizational documents, as currently in effect, of Parent or any of its
     "Significant Subsidiaries" (as such term is defined in regulations
     promulgated under the Securities Act or the Exchange Act), (ii) except for
     (A) the consents, approvals, orders, authorizations, registrations,
     declarations and filing required under or in relation to clause (x) of
     Section 3.1(c)(iii) and (B) such consents, approvals, orders,
     authorizations, registrations, declarations and filings the failure of
     which to make or obtain could not reasonably be expected to have a Material
     Adverse Effect on Parent or impair or delay the ability of Parent or
     consummate the transactions contemplated hereby, require any filing with,
     or consent or approval of, any Government Entity having jurisdiction over
     any of the business or assets of Parent or any of its Significant
     Subsidiaries, (iii) violate any statute, law, ordinance, rule or regulation
     applicable to Parent or any of its Significant Subsidiaries or any
     injunction, judgment, order, writ, or decree to which Parent or any of its
     Significant Subsidiaries is subject, or (iv) result in a breach of, or
     constitute a default or an event which, with the passage of time or the
     giving of notice, or both, would constitute a default, give rise to a right
     of termination, cancellation, or acceleration, create any entitlement of
     any third party to any material payment or benefit, require the consent of
     any third party, or result in the creation of any lien on the assets or
     stock of Parent or any of its Significant Subsidiaries, except, in the case
     of clauses (ii), (iii) and (iv), where the violation, breach, default,
     termination, cancellation, acceleration, payment, benefit, or lien, or the
     failure to make such filing or obtain such consent or approval could not,
     individually or in the aggregate, reasonably be expected to have a Material
     Adverse Effect on Parent.
 
          (e) Reports and Financial Statements.
 
             (i) Parent has filed all required reports, schedules, forms,
        statements and other documents required to be filed by it with the SEC
        since January 1, 1996 (collectively,
 
                                      A-25
<PAGE>   109
 
        including all exhibits thereto and documents incorporated by reference
        therein, the "Parent SEC Reports"). None of the Parent SEC Reports, as
        of their respective dates (and, if amended or superseded by a filing
        prior to the date of this Agreement, then on the date of such filing),
        contained or will contain any untrue statement of a material fact or
        omitted or will 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. Each of the
        financial statements (including the related notes) included in the
        Parent SEC Reports presents fairly, in all material respects, the
        consolidated financial position and consolidated results of operations
        and cash flows of Parent and its Subsidiaries as of the respective dates
        or for the respective periods set forth therein, all in conformity with
        GAAP consistently applied during the periods involved except as
        otherwise noted therein, and subject, in the case of the unaudited
        interim financial statements, to normal and recurring year-end
        adjustments that have not been and are not expected to be material in
        amount. All of such Parent SEC Reports, as of their respective dates
        (and as of the date of any amendment to the respective Parent SEC
        Report), complied as to form in all material respects with the
        applicable requirements of the Securities Act and the Exchange Act and
        the rules and regulations promulgated thereunder.
 
          (f) Proxy Statement/Registration Statement.  The Registration
     Statement shall not at the time the Registration Statement is declared
     effective by the SEC contain any untrue statement of a material fact or
     omit to state any material fact required to be stated in the Registration
     Statement or necessary in order to make the statements in the Registration
     Statement, in light of the circumstances under which they were made, not
     misleading (excluding any statement based upon information supplied by the
     Company for inclusion in the Proxy Statement). The information to be
     supplied by Parent for inclusion in the Registration Statement shall not on
     the date the Proxy Statement is first mailed to shareholders of the
     Company, at the time of the Company Shareholders' Meeting, and at the
     Effective Time, contain any statement that, at such time and in light of
     the circumstances under which it shall be made, is false or misleading with
     respect to any material fact, or omit to state any material fact necessary
     in order to make the statements made in the Proxy Statement not false or
     misleading.
 
          (g) Absence of Certain Changes or Events.  Except as expressly
     disclosed in the Parent SEC Reports filed prior to the date of this
     Agreement, since June 30, 1998, there has not been a Material Adverse
     Effect on Parent or any development or combination of developments of which
     management of Parent has knowledge which is reasonably likely to result in
     such an effect.
 
          (h) No Vote Required.  No vote or approval of the holders of any class
     of Parent shares is necessary to approve this Agreement and the
     transactions contemplated hereby.
 
          (i) Brokers or Finders.  No agent, broker, investment banker,
     financial advisor or other firm or Person engaged by Parent or Merger Sub
     is or will be entitled to any broker's or finder's fee or any other similar
     commission or fee from the Company or its Subsidiary in connection with any
     of the transactions contemplated by this Agreement.
 
          (j) Ownership of Company Common Stock.  Except for Company Common
     Shares which Parent may acquire pursuant to the terms of the Option
     Agreement and the Voting Agreements, Parent "beneficially owns" (as such
     terms are used in connection with Rule 13d-3 under the Exchange Act) less
     than 1% of the outstanding Company Common Shares.
 
          (k) Merger Sub.  Merger Sub was formed solely for the purpose of
     effecting the Merger and has not engaged in any business activities or
     conducted any operations other than in connection with the Merger. Except
     for obligations or liabilities incurred in connection with its
     incorporation or organization and the transactions contemplated by this
     Agreement, and except
 
                                      A-26
<PAGE>   110
 
     for this Agreement and any other agreements or arrangements contemplated by
     this Agreement, Merger Sub has not incurred, directly or indirectly,
     through any subsidiary or affiliate, any obligations or liabilities or
     entered into any agreement or arrangements with any person.
 
                                  ARTICLE IV.
 
                   COVENANTS RELATING TO CONDUCT OF BUSINESS
 
     4.1  Covenants of the Company.  During the period from the date of this
Agreement and continuing until the Effective Date (except as expressly permitted
by this Agreement or as otherwise indicated in Schedules 4.1 or to the extent
that Parent shall otherwise consent in writing), the Company and its
Subsidiaries shall carry on their respective businesses in the usual, regular
and ordinary course in all material respects, in substantially the same manner
as heretofore conducted, and shall use reasonable best efforts to preserve their
relationships with employees, Governmental Entities, customers, suppliers and
others having business dealings with them with the objective that their ongoing
businesses shall not be impaired at the Effective Time. In furtherance and not
in limitation of the foregoing, until the Effective Time (except as expressly
permitted by this Agreement or as otherwise indicated in the Company Disclosure
Schedule or to the extent that Parent shall otherwise consent in writing):
 
          (a) Dividends; Changes in Share Capital.  The Company shall not, and
     shall not permit any of its Subsidiaries to, and shall not propose to, (i)
     declare or pay any dividends on or make other distributions in respect of
     any of its capital stock, except dividends by the Company's wholly-owned
     Subsidiaries in the ordinary course of business consistent with past
     practice, (ii) split, combine, subdivide or reclassify any of its capital
     stock or issue or authorize or propose the issuance of any other securities
     in respect of, in lieu of or in substitution for, shares of its capital
     stock, except for any such transaction by a wholly-owned Subsidiary of the
     Company which remains a wholly-owned Subsidiary after consummation of such
     transaction, or (iii) repurchase, redeem or otherwise acquire any shares of
     its capital stock or any securities convertible into or exercisable for any
     shares of its capital stock.
 
          (b) Securities.  The Company and its Subsidiaries shall not issue,
     deliver, sell, dispose, pledge or encumber, or authorize or propose the
     issuance, delivery, sale, disposition, pledge or encumbrance of, any shares
     of its capital stock of any class or other securities or any securities
     convertible into or exercisable or exchangeable for, or any rights,
     warrants, calls, commitments or options to acquire, any such shares or
     securities, or enter into any agreement with respect to any of the
     foregoing and shall not amend any equity-related awards issued pursuant to
     the Company Benefit Plans, other than the issuance of Company Common Stock
     upon the exercise of stock options issued in the ordinary course of
     business and consistent with past practice in accordance with the terms of
     the Company Stock Option Plans as in effect on the date of this Agreement.
 
          (c) Organizational Documents and Funding.  The Company and its
     Subsidiaries shall not amend or propose to amend their respective
     Organizational Documents.
 
          (d) Investments and Loans.  The Company shall not, and shall not
     permit any of its Subsidiaries to, (i) incur any indebtedness for borrowed
     money or guarantee, endorse or assume any obligation of other Persons other
     than indebtedness of the Company or any of its Subsidiaries to the Company
     or any wholly owned Subsidiary of the Company; provided, however, that the
     Company may incur indebtedness under its current bank credit facilities
     such that the total amount outstanding thereunder does not exceed the
     amounts set forth on Schedule 4.1(d)(i) to the extent and for the purposes
     set forth on such schedule plus any amounts necessary to comply with
     Section 5.9, (ii) make any loans, advances or capital contributions to, or
     investments in, any other Person, other than by the Company or any of its
 
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<PAGE>   111
 
     Subsidiaries to or in the Company or any of its wholly-owned Subsidiaries,
     except for loans, advances, capital contributions or investments in Persons
     that are entities in whom the Company has investments as of the date of
     this Agreement, made in the ordinary course of business, consistent with
     past practice, in respect of the Company's current line of business (and
     after consultation with Parent) which in the aggregate do not exceed two
     million dollars, or (iii) pay, discharge or satisfy any claims, liabilities
     or obligations (absolute, accrued, asserted or unasserted, contingent or
     otherwise), other than in the ordinary course of business consistent with
     past practice.
 
          (e) Compensation.  The Company and its Subsidiaries shall not (i)
     grant any increases in the compensation of any of its directors, officers
     or employees, except in the ordinary course of business consistent with
     past practice, (ii) pay or award or agree to pay or award any pension,
     retirement allowance, or other nonequity incentive awards, or other
     employee benefit, not required by any outstanding employee benefit plans or
     arrangements to any current or former director, officer or employees,
     whether past or present, or to any other Person, except for payments or
     awards that are in the ordinary course of business, consistent with past
     practice, and that are not material; provided, however, that the Company
     and its Subsidiaries may pay cash bonuses for 1998 in the ordinary course
     of business consistent with past practice not to exceed the amount set
     forth in Schedule 4.1(e)(ii), (iii) reprice, pay or award or agree to
     reprice, pay or award any stock option or equity incentive awards, (iv)
     enter into any new or amend any existing employment agreement with any
     director, officer or employee, except for employment agreements with new
     employees entered into in the ordinary course of business consistent with
     past practice and except with respect to employees who are not officers,
     executives or directors of the Company or its Subsidiaries, for amendments
     in the ordinary course of business, consistent with past practice, that do
     not materially increase benefits or payments, (v) enter into any new or
     amend any existing severance agreement with any current or former director,
     officer or employee, except with respect to employees who are not officers,
     executives or directors of the Company or its Subsidiaries, for agreements
     or amendments in the ordinary course of business, consistent with past
     practice, that do not provide for materially increased benefits, (vi) other
     than the acceleration of outstanding Company Stock Options and payments
     under the Company's Five Year Incentive Plan, and other payments, in each
     case as set forth in Schedule 4.1(e)(vi), enter into any agreement or
     exercise any discretion providing for acceleration of payment or
     performance as a result of a change of control of the Company or its
     Subsidiaries or (vii) become obligated under any new employee benefit plan
     or arrangement, which was not in existence on the date hereof or amend or
     exercise discretion pursuant to any such employee benefit plan or
     arrangement in existence on the date hereof, except for any such amendment
     applicable only to employees who are not officers, executives or directors
     of the Company or its Subsidiaries or exercise of discretion in the
     ordinary course of business, consistent with past practice (that does not
     disproportionately effect officers, executives or directors as opposed to
     other employees);
 
          (f) Extraordinary Transactions.  The Company and its Subsidiaries
     shall not adopt a plan of complete or partial liquidation, dissolution,
     merger, consolidation, restructuring, recapitalization or other
     reorganization of the Company or any of its Subsidiaries;
 
          (g) Acquisitions; Other Uses of Funds.  The Company and its
     Subsidiaries shall not make any acquisition, by means of merger,
     consolidation or otherwise, of (i) any direct or indirect ownership
     interest in or assets comprising any business enterprise or operation or
     spectrum or (ii) except in the ordinary course and consistent with past
     practice, any other assets;
 
          (h) Wireless Assets.  The Company and its Subsidiaries shall not make
     any disposition of any direct or indirect ownership interest in or assets
     comprising any tower or wireless system or
 
                                      A-28
<PAGE>   112
 
     part thereof or cell site or any other local service or access system
     (including any shares of capital stock of any Subsidiary holding any such
     interest) or other investment (other than cash equivalents) or material
     business enterprise or operation (except for the replacement or upgrade of
     assets, or disposition of redundant assets, in each case in the ordinary
     course and consistent with past practice), except sales of individual
     assets (other than inventory) in the ordinary course and consistent with
     past practice not exceeding, in the aggregate, $1,000,000;
 
          (i) Line of Business.  The Company and its Subsidiaries shall not (i)
     make any investment in a Person with operations in any foreign nation other
     than in those Persons listed Schedule 4.1(i) (and only if such Persons
     continue to operate only in the nations listed on Schedule 3.1(v)) or (ii)
     engage in the conduct of any business or in any nation other than the
     wireless telecommunications and related businesses conducted as of the date
     hereof and in the nations where so conducted or in any planned expansion
     thereof as disclosed to Parent in writing prior to the date hereof;
 
          (j) Expenditures.  For any quarter, the Company and its Subsidiaries
     shall not make any capital expenditures in excess of the total amount set
     forth for capital expenditures for such quarter in Schedule 4.1(j);
     provided that any amounts not spent in prior quarters permitted hereunder
     may be spent in succeeding quarters, and any amounts set forth for a
     particular quarter may be accelerated and spent in the immediately
     preceding quarter. The Company shall not enter into any contracts,
     arrangements or understandings requiring capital expenditures at times or
     in amounts other than as set forth in the preceding sentence;
 
          (k) Affiliates.  The Company and its Subsidiaries shall not enter
     into, or amend or waive any right under, any agreement with any Affiliates
     of the Company (other than its Subsidiaries) or with International Wireless
     Communications Holdings, Inc. or its Affiliates;
 
          (l) Claims.  The Company and its Subsidiaries shall not (i) settle or
     compromise any material claims (including without limitation Tax claims) or
     material litigation; (ii) except in the ordinary course of business
     consistent with past practice, prepay or terminate any Company Material
     Contracts; or (iii) except in the ordinary course of business, modify,
     prepay, amend or terminate any other material agreement of the Company or
     any Subsidiary or waive, release or assign any material rights or claims;
 
          (m) Certain Agreements.  The Company and its Subsidiaries shall not
     enter into any agreement containing any provision or covenant limiting the
     ability of the Company or its Subsidiary to (i) sell any products or
     services of or to any other person, (ii) engage in any line of business or
     (iii) compete with or to obtain products or services from any person or
     limiting the ability of any person to provide products or services to the
     Company or any of its Subsidiaries;
 
          (n) Tax and Accounting.  Neither the Company nor any of its
     Subsidiaries shall make or rescind any material Tax election (other than
     the making of such elections in the ordinary course of business consistent
     with past practice, which elections are required to be made on a periodic
     basis), settle or compromise any material Tax liability or change any of
     its methods of accounting for Tax or other purposes, except as may be
     required by applicable law or by the rules and pronouncements of the
     Securities and Exchange Commission;
 
          (o) Other Actions.  The Company shall not, and shall not permit any of
     its Subsidiaries to, take any action that could reasonably be expected to
     result in (i) any of the representations or warranties of the Company set
     forth in this Agreement that are qualified as to materiality becoming
     untrue, or any of the representations or warranties of the Company set
     forth in this Agreement that are not so qualified becoming untrue in any
     material respect or (ii) except as
 
                                      A-29
<PAGE>   113
 
     otherwise permitted by Section 5.4, any of the conditions to the Merger set
     forth in Article VI not being satisfied.
 
          (p) Intention.  The Company and its Subsidiaries shall not enter into
     any agreement, commitment, or obligation to take any action prohibited by
     this Section.
 
     4.2  Reasonable Efforts.  Subject to Parent's rights to delay the Closing
as set forth in Section 2.1, each of the Company and Parent and their respective
Subsidiaries shall use their reasonable commercial efforts to effectuate the
transactions contemplated hereby and to cause to be fulfilled the conditions to
Closing under this Agreement, and the Company shall use its commercially
reasonable efforts to comply with and to effectuate the Voting Agreements and
the Option Agreement. Notwithstanding the foregoing or anything in this
Agreement to the contrary, (i) (A) neither the Company nor any of its
Subsidiaries shall, without Parent's prior written consent, commit to any
divestiture or hold separate or similar transaction and each of the Company and
its Subsidiaries shall commit to, and shall use reasonable efforts to effect,
such a transaction (which may, at the Company's option, be conditioned upon and
effective as of the Effective Time) as Parent shall request, and (B) neither
Parent nor any of its Subsidiaries shall be required to divest or hold separate
or otherwise take (or refrain from taking) or commit to take (or refrain from
taking) any action that limits its freedom of action with respect to, or its
ability to retain, the Company or any of its Subsidiaries or any material
portion of the assets of the Company and its Subsidiaries, or any of the
business, product lines or assets of Parent or any of its Subsidiaries, except
(1) Parent shall take such action with respect to personal communications
services ("PCS") spectrum in the Company's geographic cellular service areas as
is required to comply with the FCC's spectrum aggregation rules and policies or
shall obtain a timely waiver of such rules and policies and (2) any such
divestiture, requirement to hold separate, or limitation that arises after
Parent or any of its Subsidiaries engages in, or agrees to engage in, a merger,
acquisition or other business combination transaction after the date hereof (and
which has not been publicly announced prior to the date hereof), but would not
have arisen but for Parent engaging in or agreeing to engage in such
transaction, and (ii) nothing in this Agreement shall prevent or restrict Parent
and its Subsidiaries from engaging in any merger, acquisition or business
combination transaction; provided that such merger, acquisition or, business
combination transaction would not (x) prevent, or delay beyond the Outside Date
the ability of Parent to consummate the Merger or (y) cause the Merger to fail
to qualify as a reorganization within the meaning of Section 368(a) of the Code.
 
     4.3  NYSE Listing.  Parent will use reasonable best efforts to cause the
shares of Parent Common Stock to be listed at the Effective Time on the NYSE.
 
     4.4  Advice of Changes; Government Filings.  Each party shall (a) confer on
a regular and frequent basis with the other, (b) report (to the extent permitted
by law, regulation and any applicable confidentiality agreement) on the
Company's operational matters and (c) promptly advise the other orally and in
writing of (i) any representation or warranty made by it contained in this
Agreement that is qualified as to materiality or Material Adverse Effect
becoming untrue or inaccurate in any respect or any such representation or
warranty that is not so qualified becoming untrue and inaccurate in may material
respect, (ii) the failure by it (A) to comply with or satisfy in any respect any
covenant, condition or agreement required to be complied with or satisfied by it
under this Agreement that is qualified as to materiality or Material Adverse
Effect or (B) to comply with or satisfy in any material respect any covenant,
condition or agreement required to be complied with or satisfied by it under
this Agreement that is not so qualified as to materiality or (iii) any change,
event or circumstance that has had or could reasonably be expected to have a
Material Adverse Effect on such party or materially adversely affect its ability
to consummate the Merger in a timely manner; provided, however, that no such
notification shall affect the representations, warranties, covenants or
agreements of the parties or the conditions to the obligations of the parties
 
                                      A-30
<PAGE>   114
 
under this Agreement. The Company and Parent shall file all reports required to
be filed by each of them with the FCC and the SEC (and all other Governmental
Entities) between the date of this Agreement and the Effective Time and shall
(to the extent permitted by law or regulation or any applicable confidentiality
agreement) deliver to the other party copies of all such reports promptly after
the same are filed. Each party agrees that, to the extent practicable, it will
consult with the other party with respect to the obtaining of all permits,
consents, approvals and authorizations of all third parties and Governmental
Entities necessary or advisable to consummate the transactions contemplated by
this Agreement and each party will keep the other party apprised of the status
of matters relating to completion of the transactions contemplated hereby.
 
     4.5  Control of Other Party's Business.  Nothing contained in this
Agreement shall give the Company, directly or indirectly, the right to control
or direct Parent's operations prior to the Effective Time. Nothing contained in
this Agreement shall be given Parent, directly or indirectly, the right to
control or direct the Company's operations prior to the Effective Time. Prior to
the Effective Time, each of the Company and Parent shall exercise, consistent
with the terms and conditions this Agreement, complete control and supervision
over its respective operations.
 
                                   ARTICLE V.
 
                             ADDITIONAL AGREEMENTS
 
     5.1  Preparation of Proxy Statement/Registration; Company Shareholder
Meeting.
 
          (a) As promptly as practicable after the execution of this Agreement,
     Parent and the Company shall prepare and file with the SEC a proxy
     statement/prospectus (the "Proxy Statement") to be sent to the shareholders
     of the Company in connection with the Company Shareholders' Meeting to
     consider the Merger and the issuance of Parent Common Stock in connection
     therewith, and Parent shall prepare and file with the SEC a registration
     statement on Form S-4 pursuant to which the shares of Parent Common Stock
     to be issued in the Merger will be registered under the Securities Act (the
     "Registration Statement"), in which the Proxy Statement will be included as
     a prospectus. Parent may delay the filing of the Registration Statement
     until after the Proxy Statement has been declared effective. Parent and the
     Company shall use reasonable best efforts to cause the Registration
     Statement to become effective as soon after the filing as practicable. The
     Proxy Statement shall include the unanimous recommendation of the Board of
     Directors of the Company in favor of this Agreement and the Merger unless
     the Board is not required to make such recommendation pursuant to clause
     (e) below. Parent and the Company shall make all other necessary filings
     with respect to the Merger under the Securities Act and the Exchange Act
     and the rules and regulations thereunder. If at any time before the
     Effective Time any event relating to the Company or Parent, or any of its
     affiliates, officers, or directors, is discovered by the Company or Parent,
     respectively, that should be set forth in an amendment to the Registration
     Statement or a supplement to the Proxy Statement, such party shall promptly
     so inform the other.
 
          (b) The Company shall take all action necessary to cause the
     representation set forth in Section 3.1(e) to be true and correct at all
     applicable times with respect to each of the Proxy Statement and the
     Registration Statement.
 
          (c) Parent shall take all action necessary to cause the representation
     set forth in Section 3.2(f) to be true and correct at all applicable times
     with respect to each of the Proxy Statement and the Registration Statement.
 
          (d) As soon as reasonably practicable, the Company and Parent shall
     take all such actions as may be necessary to comply with state "blue sky"
     or securities laws in connection with the transactions contemplated by this
     Agreement.
                                      A-31
<PAGE>   115
 
          (e) The Company shall, as soon as practicable following the date of
     this Agreement, duly call, give notice of, convene and hold a meeting of
     its shareholders (the "Company Shareholders Meeting") for the purpose of
     obtaining the Required Company Votes with respect to this Agreement. The
     Board of Directors of the Company shall unanimously recommend adoption of
     this Agreement by the shareholders of the Company and, upon Parent's
     request, reconfirm such recommendation (provided that the Board of
     Directors of the Company need not (1) make or reconfirm such recommendation
     (x) if at the time that it would otherwise be required to make or reconfirm
     such recommendation the Company is not then in breach of its obligations
     under Section 5.4 and (y) in such event, if and only to the extent that the
     Board of Directors of the Company concludes in good faith (after having
     consulted with and considered the advice of outside legal counsel) in
     connection with the receipt of a Superior Proposal that such action is
     necessary in order for its directors to comply with their respective
     fiduciary duties under applicable law, or reconfirm such recommendation (2)
     reconfirm such recommendation if no other Acquisition Proposal is pending
     or in Parent's reasonable judgment likely to become pending. Subject to the
     foregoing, the Company shall use reasonable best efforts to solicit such
     adoption.
 
     5.2  Access to Information.  Upon reasonable notice, the Company and its
Subsidiaries shall afford to the officers, employees, accountants, counsel,
financial advisors and other representatives of Parent reasonable access during
normal business hours, during the period prior to the Effective Time, to all its
personnel, properties, books, contracts, commitments and records and, during
such period, the Company and its Subsidiaries shall furnish promptly to Parent
(a) a copy of each report, schedule, registration statement and other document
filed, published, announced or received by it during such period pursuant to the
requirements of Federal or state securities laws, as applicable (other than
reports or documents which such party is not permitted to disclose under
applicable law) and (b) consistent with its legal obligations, all other
information concerning its business, properties and personnel as Parent may
reasonably request; provided, however, the Company may restrict the foregoing
access to the extent that (i) a Governmental Entity requires the Company or any
of its Subsidiaries to restrict access to any properties or information
reasonably related to any such contract on the basis of applicable laws and
regulations with respect to national security matters or (ii) any law, treaty,
rule or regulation of any Governmental Entity applicable to the Company or its
Subsidiaries requires the Company or its Subsidiaries to restrict access to any
properties or information.
 
     5.3  Approvals and Consents; Cooperation.  Subject to Section 4.2, each of
the Company and Parent shall cooperate with each other and use (and shall cause
their respective Subsidiaries to use) its reasonable best efforts to take or
cause to be taken all actions, and do or cause to be done all things, necessary,
proper or advisable on their part under this Agreement and applicable laws to
consummate and make effective the Merger and the other transactions contemplated
by this Agreement as soon as practicable, including (i) preparing and filing
promptly, after consulting with the other party and providing an opportunity to
review related documentation in advance, all documentation to effect all
necessary applications, notices, petitions, filings, tax ruling requests and
other documents and to obtain all consents, waivers, licenses, registrations,
permits, authorizations, tax rulings and authorizations necessary or advisable
to be obtained from any third party and/or any Governmental Entity in order to
consummate the Merger or any of the other transactions contemplated by this
Agreement and (ii) taking all reasonable steps as may be necessary to obtain all
such consents, waivers, licenses, registrations, permits, authorizations, tax
rulings, orders and approvals. Without limiting the generality of the foregoing,
the Company and Parent agree to make all necessary filings in connection with
the Required Regulatory Approvals promptly following the date of this Agreement,
and to use its reasonable best efforts to furnish or cause to be furnished, as
promptly as practicable, all information and documents requested with respect to
such Required
 
                                      A-32
<PAGE>   116
 
Regulatory Approvals and shall otherwise cooperate with the applicable
Governmental Entity in order to obtain any Required Regulatory Approvals.
Subject to Section 4.2, each of the Company and Parent shall use its reasonable
best efforts to resolve such objections, if any, as any Governmental Entity may
assert with respect to this Agreement and the transactions contemplated hereby
in connection with the Required Regulatory Approvals in as expeditious a manner
as possible. Subject to Section 4.2, in the event that a suit is instituted by a
Person or Governmental Entity challenging this Agreement and the transactions
contemplated hereby as violative of applicable antitrust or competition laws or
the Communications Act, each of the Company and Parent shall use its reasonable
best efforts to resist or resolve such suit. The Company and Parent each shall,
upon request by the other, furnish the other with all information concerning
itself, its Subsidiaries, directors, officers and shareholders and such other
matters as may be reasonably be necessary or advisable in connection with the
Proxy Statement or any other statement, filing, tax ruling request, notice or
application made by or on behalf of the Company, Parent or any of their
respective Subsidiaries to any third party and/or any Governmental Entity in
connection with the Merger or the other transactions contemplated by this
Agreement.
 
     5.4  Acquisition Proposals.  The Company agrees that it and its
Subsidiaries, officers, directors, employees, agents and representatives
(including any investment banker, attorney or accountant retained by it) shall
not, directly or indirectly, initiate, solicit, encourage or otherwise
facilitate any inquiries or the making of any proposal or offer with respect to
a merger, reorganization, share exchange, consolidation, business combination,
recapitalization, liquidation, dissolution or similar transaction involving, or
any purchase of any substantial portion of the assets of, or any equity
securities of, or any transaction that would involve the transfer or potential
transfer of control of, the Company (any such proposal or offer being
hereinafter referred to as an "Acquisition Proposal") and has terminated any
discussions or negotiations with, and the provision of information or data to,
any Person (other than Parent) respecting an Acquisition Proposal. The Company
further agrees that it and its Subsidiaries, officers, directors, employees,
agents and representatives (including any investment banker, attorney or
accountant retained by it) shall not, directly or indirectly, provide any
confidential information or data to any Person relating to or in contemplation
of an Acquisition Proposal or engage in any negotiations or discussions relating
to or in contemplation of an Acquisition Proposal; provided, however, that
nothing contained in this Agreement shall prevent the Company or its Board of
Directors from (a) complying with Rule 14e-2 promulgated under the Exchange Act
with regard to any Acquisition Proposal; and (b) if any only to the extent that
the Board of Directors of the Company concludes in good faith (after having
consulted with and considered the advice of outside legal counsel) that such
Acquisition Proposal would, if consummated, result in a transaction more
favorable to the Company shareholders from a financial point of view than the
transaction contemplated by this Agreement (any such more favorable Acquisition
Proposal being referred to in this Agreement as a "Superior Proposal"), until
the Required Company Vote has been obtained, the Company may furnish or cause to
be furnished confidential information or data and may participate in such
negotiations and discussions but only if (i) the Company is not then in breach
of its obligations under this Section, (ii) (and only to the extent that) the
Board of Directors of the Company concludes in good faith (after having
consulted with and considered the advice of outside legal counsel) that such
action is necessary in order for its directors to comply with their respective
fiduciary duties under applicable law and (iii) confidentiality arrangements on
terms no less beneficial to the Company as those entered into by Parent are
entered into with respect thereto. The Company will notify Parent immediately if
any inquiries, proposals or offers respecting an Acquisition Proposal are
received by, any such information or data is requested from, or any such
discussions or negotiations are sought to be initiated or continued with, it or
any such Persons indicating, in connection with such notice, the name of such
Person and the material terms and conditions of any proposals or offers, and
shall keep Parent apprised with respect to the status and terms thereof. The
Company also will promptly request each Person that has heretofore executed a
confidentiality
 
                                      A-33
<PAGE>   117
 
agreement in connection with its consideration of an Acquisition Proposal to
return all confidential information heretofore furnished to such Person by or on
behalf of it or any of its Subsidiaries and will not waive any "standstill"
provision of any such, or any other, agreement. The Company shall provide Parent
at least two business days advance notice of its intention to present to its
Board of Directors or accept any Superior Proposal and shall provide Parent with
a summary of the terms and conditions thereof. Notwithstanding the foregoing,
none of the actions set forth on Schedule 5.4 shall constitute an Acquisition
Proposal.
 
     5.5  Employee Benefits.
 
          (a) For a period of two years immediately following the Closing Date,
     Parent shall or shall cause the Surviving Corporation to maintain in effect
     employee benefit plans and arrangements which provide benefits which have a
     value substantially comparable, in the aggregate, to the benefits provided
     by the Company Benefit Plans (not taking into account the value of any
     benefits under any such plans which are equity based); provided, that
     Parent at its sole option may provide employee benefits to the Surviving
     Corporation which, in the aggregate, are substantially comparable to those
     applicable to similarly situated employees of Parent or its Subsidiaries.
     At the request of Parent, the Company shall, prior to the Effective Time,
     terminate the Company's 401(k) Plan effective immediately prior to the
     Effective Time. The Company shall terminate the Company's Employee Stock
     Purchase Plan (the "ESPP") for each fiscal quarter beginning on or after
     October 1, 1998 and shall cease all offering periods that begin on or after
     September 30, 1998.
 
          (b) For purposes of determining eligibility to participate, vesting
     and accrual or entitlement to benefits where length of service is relevant
     under any employee benefit plan or arrangement of Parent, the Surviving
     Corporation or any of their respective Subsidiaries, employees of the
     Company and its Subsidiaries as of the Effective Time shall receive service
     credit for service with the Company and any of its Subsidiaries to the same
     extent such service credit was granted under the Company Benefit Plans,
     subject to offsets for previously accrued benefits and no duplication of
     benefits (except that no such credit shall be applied for (i) benefit
     accrual or entitlement purposes under defined benefit pension plans or the
     schedule of benefits under Parent's severance pay and short term disability
     plans and policies, (ii) eligibility to receive post-retirement ancillary
     benefits (consisting at this time of medical, dental, death and telephone
     concession benefits) or (iii) calculating Parent service for purposes of
     "bridging" prior Parent service under Parent benefit plans).
 
          (c) Parent shall cause the Surviving Corporation to assume and honor
     in accordance with their terms (i) all written employment, severance and
     termination plans and agreements (including change in control provisions)
     of employees of the Company and its Subsidiaries provided to Parent on or
     prior to the date of this Agreement and (ii) the Tax Reimbursement
     Agreements identified in Schedule 5.5(c)(ii).
 
     5.6  Fees and Expenses.  Whether or not the Merger is consummated, all
Expenses incurred in connection with this Agreement and the transactions
contemplated hereby shall be paid by the party incurring such Expenses, except
(a) if the Merger is consummated, the Surviving Corporation shall pay, or cause
to be paid, any and all property or transfer taxes imposed on the Company or its
Subsidiaries (b) the Expenses incurred in connection with printing, filing and
mailing to shareholders of the Proxy Statement and the solicitation of
shareholder approvals shall be borne by the Company, and (c) as provided in
Section 7.2. As used in this Agreement, "Expenses" includes all reasonable
out-of-pocket expenses (including, without limitation, all fees and expenses of
counsel, accountants, investment bankers, experts and consultants to a party
hereto and its affiliates) incurred by a party or on its behalf in connection
with or related to the authorization, preparation, negotiation, execution and
performance of this Agreement and the transactions contemplated hereby,
including the
 
                                      A-34
<PAGE>   118
 
preparation, printing, filing and mailing of the Proxy Statement and the
solicitation of shareholder approvals and all other matters related to the
transactions contemplated hereby.
 
     5.7  Indemnification; Directors' and Officers' Insurance.  The Surviving
Corporation shall cause to be maintained in effect (i) for a period of six years
after the Effective Time, the current provisions regarding indemnification of
officers and directors contained in the Organizational Documents of the Company
and its Subsidiaries and (ii) for a period of six years, the current policies of
directors' and officers' liability insurance and fiduciary liability insurance
maintained by the Company (provided that the Surviving Corporation may
substitute therefor policies of at least the same coverage and amounts
containing terms and conditions which are, in the aggregate, no less
advantageous to the insured) with respect to claims arising from facts or events
that occurred on or before the Effective Time, provided that the annual premium
therefor is not in excess of 200% of the last annual premium paid by the Company
prior to the date hereof, or if such premium is in excess of such amount, such
policies of directors' and officers' liability insurance and fiduciary liability
insurance providing for as much coverage as can be obtained for such amount.
 
     5.8  Public Announcements.  The Company and Parent shall use reasonable
best efforts to develop a joint communications plan and each party shall use
reasonable best efforts to ensure that, all press releases and other public
statements with respect to the transactions contemplated hereby shall be
consistent with such joint communications plan. Unless otherwise required by
applicable law or by obligations pursuant to any listing agreement with or rules
of any securities exchange, the Company shall consult with, and use reasonable
best efforts to accommodate the comments of, Parent before issuing any press
release or otherwise making any public statement with respect to this Agreement
or the transactions contemplated hereby.
 
     5.9  Debentures.  (a) Subject to compliance with this Section 5.9, the
Company may, at its election, commence a tender offer and consent solicitation
(the "Tender Offer") to purchase the Company's outstanding 9 3/8% Debentures due
2006 (the "Debentures") on the terms and conditions set forth in Schedule 5.9
hereto, which shall effect the deletion of substantially all of the covenants in
the related Indenture, dated as of April 1, 1996, as amended by the First
Supplemental indenture thereto, dated as of April 1, 1996 (as so amended, the
"Indenture"), which may be deleted therefrom with the consent (the "Requisite
Consent") of a majority in principal amount of outstanding Debentures, as set
forth in Schedule 5.9 (the "Majority Covenants").
 
     (b) The Tender Offer shall be commenced as promptly as practicable
following November 4, 1998, and, in any event, within three days following such
date (the "Third Day"). Except as may be required by law, the Company shall not
extend the consent date or expiration date of, or amend or waive any terms or
conditions of, the Tender Offer, or deem any condition thereof not to be
satisfied, without Parent's prior written consent (in its sole discretion),
provided that, on any scheduled consent date under the Tender Offer prior to
November 25, 1998, the Company may extend such consent date, for one business
day, if on such consent date the Requisite Consent has not been received.
 
     (c) All documentation delivered in connection with the Tender Offer shall
be acceptable to Parent (in its sole discretion), and Parent shall be provided
all such documentation sufficiently in advance of the anticipated date of use of
such documentation to meaningfully review and comment on such documentation. The
Company shall provide Parent with (i) opinions of North Carolina and New York
counsel to the Company, addressed to both the Company and Parent, in form and
substance satisfactory to Parent (in its sole discretion) and as set forth in
Schedule 5.9 hereto respecting the commencement and consummation of the Tender
Offer and the execution and delivery of the Supplemental Indenture and (ii)
reliance letters permitting Parent and the Company to rely on any legal opinions
or certificates delivered in connection therewith.
 
                                      A-35
<PAGE>   119
 
     (d) If the Tender Offer is commenced (x) upon the receipt of the Requisite
Consent, the Company shall execute and use its best efforts to cause the Trustee
to execute the Supplemental Indenture at the Consent Time (as defined in the
Tender Offer) and (y) upon the expiration of the period for tendering Debentures
under the Tender Offer, if the conditions to consummation of the Tender Offer
have been satisfied, the Company shall accept for payment and purchase all
Debentures validly tendered thereunder and shall deliver such Debentures to the
Trustee under the Indenture for cancellation.
 
     (e) Promptly following the expiration of the period for tendering
Debentures under the Tender Offer without Debentures being purchased thereunder,
or upon the Third Day if the Tender Offer shall not have been commenced by such
day, the Company shall make the deposit (the "Deposit") contemplated by Section
6.1A(1) of the Indenture and shall use its best efforts to satisfy all other
conditions to the covenant defeasance provisions of Sections 6.1 and 6.1A of the
Indenture so that such covenant defeasance shall become effective with respect
to all Debentures as promptly as practicable thereafter.
 
     5.10  Affiliate Letters.  Prior to the mailing of the Joint Proxy
Statement/Prospectus, the Company shall deliver to Parent a list of names and
addresses of those Persons, that to the knowledge of the Company, are or may be
deemed to be as of the time of the Company Shareholders' Meeting "affiliates" of
the Company within the meaning of Rule 145 under the Securities Act and who own
Company Common Stock. There shall be added to such list the names and addresses
of any other Person subsequently identified by either Parent or the Company, as
the case may be (unless, in the case of Parent, an opinion of outside counsel to
the Company reasonably acceptable to Parent is provided to Parent that such
Person is not an affiliate), as a Person who may be deemed to be such an
affiliate; provided, however, that no such Person identified by Parent or the
Company, as the case may be, shall remain on such list of affiliates if Parent
or the Company, as the case may be, shall receive from the other party, on or
before the date of the Company Shareholders' Meeting, an opinion of outside
counsel reasonably satisfactory to Parent to the effect that such Person is not
such an affiliate. The Company shall use reasonable best efforts to deliver or
cause to be delivered to the other party, prior to the date of the Company
Shareholders' Meeting, from each such affiliate identified in the foregoing
lists (as the same may be supplemented as aforesaid) a letter dated as of the
Company Shareholders' Meeting in the form attached as Annex C hereto
(collectively, the "Affiliate Letter"). Parent shall not be required to maintain
the effectiveness of the S-4 Registration Statement or any other registration
statement under the Securities Act for the purposes of resale of Parent Common
Stock by such affiliates received in the Merger.
 
     5.11  Year 2000 Compliance.  The Company will use reasonable best efforts
to continue to take the actions set forth on Schedule 3.1(o).
 
                                  ARTICLE VI.
 
                              CONDITIONS PRECEDENT
 
     6.1  Conditions to Each Party's Obligation to Effect the Merger.  The
obligations of the Company, Parent and Merger Sub to effect the Merger are
subject to the satisfaction or, other than with respect to (e) below which shall
be non-waivable, waiver (by the party benefiting by such condition) on the
Closing Date of the following conditions:
 
          (a)  Shareholder Approval.  The Company shall have obtained the
     Required Company Vote.
 
          (b)  HSR Act.  The waiting period (and any extension thereof)
     applicable to the Merger under the HSR Act shall have been terminated or
     shall have expired.
 
                                      A-36
<PAGE>   120
 
          (c)  No Injunctions or Restraints, Illegality.  No temporary
     restraining order, preliminary or permanent injunction or other order
     issued by a court or other Governmental Entity of competent jurisdiction
     shall be in effect and have the effect of making the Merger illegal or
     otherwise prohibiting consummation of the Merger.
 
          (d)  Registration Statements/Proxy Statement.  The Registration
     Statement shall have become effective under the Securities Act and shall
     not be the subject of any stop order or proceedings seeking a stop order.
     The Proxy Statement shall have been delivered to the shareholders of the
     Company in accordance with the requirements of the Securities Act and the
     Exchange Act.
 
          (e) Tax Opinions.  The Company shall have received the opinion of
     Latham & Watkins and Parent shall have received the opinion of Wachtell,
     Lipton, Rosen & Katz, which opinions shall be dated as of the Closing Date,
     to the effect that the Merger will be treated for federal income tax
     purposes as a reorganization within the meaning of Section 368(a) of the
     Code and substantially in the forms attached to the Company's and Parent's
     respective Disclosure Schedules. In rendering such opinions, such firms may
     rely upon representations and covenants, including those contained in
     certificates of officers of the Company, Merger Sub and Parent, which
     representations and covenants are in form and substance reasonably
     acceptable to such counsel.
 
          (f) Listing.  The shares of Parent Common Stock to be issued in the
     Merger shall have been approved for listing on the New York Stock Exchange,
     subject to official notice of issuance.
 
     6.2  Additional Conditions to Obligations of Parent and Merger Sub.  The
obligations of Parent and Merger Sub to effect the Merger are subject to the
satisfaction of, or waiver by Parent, on the Closing Date, of the following
additional conditions:
 
          (a) Representations and Warranties.  Each of the representations and
     warranties of the Company set forth in this Agreement that is qualified as
     to materiality or Material Adverse Effect shall have been true and correct
     when made and shall be true and correct on and as of the Closing Date as if
     made on and as of such date (other than representations and warranties
     which address matters only as of a certain date which shall be true and
     correct as of such certain date); and each of the representations and
     warranties of the Company that is not so qualified shall have been true and
     correct in all material respects when made and shall be true and correct in
     all material respects on and as of the Closing Date as if made on and as of
     such date (other than representations and warranties which address matters
     only as of a certain date which shall be true and correct in all material
     respects as of such certain date); and each of the representations and
     warranties of the Company set forth in this Agreement shall be true and
     correct when made and shall be true and correct on and as of the Closing
     Date (ignoring, for such purposes, any qualification as to materiality,
     Material Adverse Effect or similar language), except as could not,
     individually or in the aggregate with all other failures to be true and
     correct, reasonably be expected to have a Material Adverse Effect on the
     Company; and Parent and Merger Sub shall have received a certificate of the
     chief executive officer and the chief financial officer of the Company to
     such effect.
 
          (b) Performance of Obligations.  The Company shall have performed or
     complied with all agreements and covenants required to be performed by it
     under this Agreement at or prior to the Closing Date that are qualified as
     to materiality or Material Adverse Effect and shall have performed or
     complied in all material respects with all agreements and covenants
     required to be performed by it under this Agreement at or prior to the
     Closing Date that are not so qualified as to materiality or Material
     Adverse Effect, and Parent and Merger Sub shall have received a
 
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<PAGE>   121
 
     certificate of the chief executive officer and the chief financial officer
     of the Company to such effect.
 
          (c) Contractual Consents.  All (i) Required Consents and (ii) other
     consents of any Person the failure of which to receive or obtain
     (individually or in the aggregate) could reasonably be expected to have a
     Material Adverse Effect on the Company shall have been obtained or given,
     in each case at not more than immaterial cost and expense to the Company
     and Parent and with not more than immaterial alteration of the Company's or
     its Subsidiary's rights or obligations under any agreement, arrangement or
     instrument.
 
          (d) Dissenting Shares.  The number of shares with respect to which
     dissenters' rights have been asserted shall not exceed 5% of the number of
     outstanding shares of Company Common Stock.
 
          (e) Required Regulatory Approvals.  All authorizations, consents,
     orders and approvals of, and declarations and filings with, and all
     expirations of waiting periods imposed by, any Governmental Entity (other
     than the FCC or the appropriate Governmental Entity under the HSR Act)
     which, if not obtained in connection with the consummation of the
     transactions contemplated hereby, could reasonably be expected to have a
     Material Adverse Effect on the Parent or Company (collectively, "Company
     Required Regulatory Approvals"), shall have been obtained, have been
     declared or filed or have occurred, as the case may be, and all such
     Company Required Regulatory Approvals shall be in full force and effect and
     shall not have any term, condition or restriction unacceptable to Parent in
     its sole discretion (except as provided in Section 4.2).
 
          (f) FCC Consents.  The FCC shall have granted its consent to the
     consummation of the transactions contemplated hereby ("FCC Consents"), such
     FCC Consents shall have become a Final Order and be in full force and
     effect and such FCC Consents shall not have any term, condition or
     restriction unacceptable to Parent in its sole discretion except as
     provided in Section 4.2.
 
          (g) Affiliate Letters.  Parent shall have received an Affiliate Letter
     from each Person identified as an affiliate pursuant to Section 5.10.
 
          (h) Absence of Certain Changes or Events.  Since the date of this
     Agreement, there shall not have been any event, development or change of
     circumstance that constitutes, has had, or could reasonably be expected to
     have, individually or in the aggregate, a Material Adverse Effect on the
     Company.
 
          (j) Suits; Actions.  No suit, action, investigation or other
     proceeding by any Governmental Entity shall have been instituted and be
     pending which imposes, seeks to impose or reasonably would be expected to
     impose any remedy, condition or restriction that would have a Material
     Adverse Effect on the Company or that would materially restrict Parent's
     ownership or operation of the Company (except as provided in Section 4.2).
 
          (k) Debentures.  Either (i) all Debentures shall have been covenant
     defeased (and all conditions thereto satisfied) in accordance with the
     covenant defeasance provisions of Sections 6.1 and 6.1A of the Indenture or
     (ii) the Supplemental Indenture shall have become effective and the
     provisions thereof shall have become operative and the Majority Covenants
     shall no longer apply to or restrict the operations of the Company and its
     successors.
 
                                      A-38
<PAGE>   122
 
     6.3  Additional Conditions to Obligations of the Company.  The obligations
of the Company to effect the Merger are subject to the satisfaction of, or
waiver by the Company on or prior to the Closing Date of the following
additional conditions:
 
          (a) Representations and Warranties.  Each of the representations and
     warranties of Parent and Merger Sub set forth in this Agreement that is
     qualified as to materiality or Material Adverse Effect shall have been true
     and correct when made and shall be true and correct on and as of the
     Closing Date as if made on and as of such date (other than representations
     and warranties which address matters only as of a certain date which shall
     be true and correct as of such certain date), and each of the
     representations and warranties of each of Parent and Merger Sub that is not
     so qualified shall have been true and correct in all material respects when
     made and shall be true and correct in all material respects on and as of
     the Closing Date as if made on and as of such date (other than
     representations and warranties which address matters only as of a certain
     date which shall be true and correct in all material respects as of such
     certain date), and the Company shall have received a certificate of and
     executive officer of Parent to such effect.
 
          (b) Performance of Obligations of Parent.  Parent shall have performed
     or complied with all agreements and covenants required to be performed by
     it under this Agreement at or prior to the Closing Date that are qualified
     as to materiality or Material Adverse Effect and shall have performed or
     complied in all material respects with all agreements and covenants
     required to be performed by it under this Agreement at or prior to the
     Closing Date that are not so qualified as to materiality, and the Company
     shall have received a certificate of an executive officer of Parent to such
     effect.
 
          (c) Required Regulatory Approvals.  All authorizations, consents,
     orders and approvals of, and declarations and filings with, and all
     expirations of waiting periods imposed by, any Governmental Entity (other
     than the FCC or the appropriate Governmental Entity under the HSR Act)
     which, if not obtained in connection with the consummation of the
     transactions contemplated hereby, could reasonably be expected to have a
     Material Adverse Effect on the Parent (collectively, "Parent Required
     Regulatory Approvals"), shall have been obtained, have been declared or
     filed or have occurred, as the case may be, and all such Parent Required
     Regulatory Approvals shall be in full force and effect.
 
                                  ARTICLE VII.
 
                           TERMINATION AND AMENDMENT
 
     7.1  Termination.  This Agreement may be terminated at any time prior to
the Effective Time, by action taken or authorized by the Board of Directors of
the terminating party or parties, whether before or after approval of the
matters presented in connection with the Merger by the shareholders of the
Company:
 
          (a) By mutual written consent of Parent and the Company, by action of
     their respective Boards of Directors;
 
          (b) By either the Company or Parent if the Merger shall not have been
     consummated by the date which is 12 months from the date of this Agreement;
     provided, however, that such date shall be extended to the date which is 18
     months from the date of this Agreement in the event all conditions to
     effect the Merger other than those set forth in Sections 6.1(b), 6.1(c),
     6.2(c), 6.2(d), 6.2(e), 6.2(f), 6.2(j) and 6.3(c) (the "Extension
     Conditions") have been or are capable of being satisfied at the time of
     such extension and the Extension Conditions have been or are reasonably
     capable of being satisfied on or prior to the date which is 18 months from
     the date of this Agreement, as it may be so extended, shall be referred to
     herein as the "Outside Date");
                                      A-39
<PAGE>   123
 
     provided further that the right to terminate this Agreement under this
     Section 7.1(b) shall not be available to any party whose failure to fulfill
     any obligation under this Agreement has been the cause of, or resulting in,
     the failure of the Merger to occur on or before such date;
 
          (c) By either the Company or Parent if any Governmental Entity shall
     have issued an order, decree or ruling or taken any other action (which
     order, decree, ruling or other action the parties shall have used their
     reasonable best effort to resist, resolve or lift, as applicable, subject
     to the provisions of Section 5.3 and 4.2) permanently restraining,
     enjoining or otherwise prohibiting the transactions contemplated by this
     Agreement, and such order, decree, ruling or other action shall have become
     final and nonappealable;
 
          (d) By either Parent or the Company if the approval by the
     shareholders of the Company required for the consummation of the Merger or
     the other transactions contemplated hereby shall not have been obtained by
     reason of the failure to obtain the required vote at a duly held meeting of
     shareholders or at any adjournment thereof;
 
          (e) By Parent if (i) the Board of Directors of the Company shall have
     withdrawn, or adversely modified, or failed (upon Parent's request) to
     reconfirm its recommendation of the Merger or this Agreement (or determined
     to do so); (ii) the Board of Directors of the Company shall have determined
     to recommend to the shareholders of the Company that they approve an
     Acquisition Proposal other than that contemplated by this Agreement or
     shall have determined to accept a Superior Proposal; (iii) a tender offer
     or exchange offer that, if successful, would result in any person or
     "group" becoming a "beneficial owner" (such terms having the meaning in
     this Agreement as is ascribed under Regulation 13D under the Exchange Act)
     of 20% or more of the outstanding shares of Company Common Stock is
     commenced (other than by Parent or an affiliate of Parent) and the Board of
     Directors of the Company fails to recommend that the shareholders of the
     Company not tender their shares in such tender or exchange offer; (iv) any
     person (other than Parent or an Affiliate of Parent) or "group" becomes the
     "beneficial owner" of 20% or more of the outstanding shares of Company
     Common Stock; (v) for any reason the Company fails to call or hold the
     Company Shareholders Meeting by the Outside Date (provided that Parent's
     right to terminate this Agreement under such clause (vi) shall not be
     available if at such time the Company would be entitled to terminate this
     Agreement under Section 7.1(h)) or (vii) the Company shall have furnished
     or caused to be furnished confidential information or data, or engaged in
     negotiations or discussions with, another Person pursuant to clause (b) of
     the proviso to the second sentence of Section 5.4;
 
          (f) By the Company, prior to the Required Company Vote having been
     obtained, if the Board of Directors of the Company determines to accept a
     Superior Proposal, but only after the Company (i) provides Parent with not
     less than 48 hours notice of its determination to accept such Superior
     Proposal including all material terms thereof and (ii) fulfills its
     obligations under Section 7.2 hereof upon such termination (provided that
     the Company's right to terminate this Agreement under this paragraph (f)
     shall not be available if the Company is then in breach of Section 5.4);
 
          (g) By Parent, if since the date of this Agreement, there shall have
     been any event, development or change of circumstance that constitutes, has
     had or could reasonably be expected to have, individually or in the
     aggregate, a Material Adverse Effect on the Company and such Material
     Adverse Effect is not cured within 30 days after written notice thereof or
     if (i)(A) the Company has breached any covenant or agreement on the part of
     the Company or any of its Subsidiaries set forth in this Agreement, the
     Voting Agreements or the Option Agreement, (B) any representation or
     warranty of the Company or any of its Subsidiaries set forth in this
     Agreement, the Voting Agreements or the Option Agreement that is qualified
     as to materiality or Material Adverse Effect shall have become untrue or
     (C) any representation or warranty of
 
                                      A-40
<PAGE>   124
 
     the Company or any of its Subsidiaries set forth in this Agreement, the
     Voting Agreements or the Option Agreement that is not so qualified shall
     have become untrue in any material respect, (ii) such breach or
     misrepresentation is not cured within 30 days after written notice thereof
     and (iii) such breach of misrepresentation would cause the conditions set
     forth in Section 6.2(a) or Section 6.2(b) not to be satisfied (a
     "Terminating Company Breach");
 
          (h) By the Company, if (i)(A) Parent has breached any covenant or
     agreement on the part of Parent or Merger Sub set forth in this Agreement,
     the Voting Agreements or the Option Agreement, (B) any representation or
     warranty of Parent or Merger Sub that is qualified as to materiality or
     Material Adverse Effect shall have become untrue or (C) any representation
     or warranty of Parent or Merger Sub that is not so qualified shall have
     become untrue in any material respect, (ii) such breach or
     misrepresentation is not cured within 30 days after written notice thereof
     and (iii) such breach or misrepresentation would cause the conditions set
     forth in Section 6.3(a) or Section 6.3(b) not to be satisfied (a
     "Terminating Parent Breach"). If at any time after the Company Shareholders
     Meeting has been called, a Terminating Parent Breach exists, and the
     Company has given Parent notice thereof, the Company shall have the right
     to adjourn or delay the Company Shareholders Meeting until up to 10 days
     after the Terminating Parent Breach has been cured or the 30 day cure
     period has expired.
 
     7.2  Effect of Termination.
 
          (a) In the event of termination of this Agreement by either the
     Company or Parent as provided in Section 7.1 this Agreement shall forthwith
     become void (other than covenants in Section 4.2 respecting the Voting
     Agreements and the Option Agreement) and there shall be no liability or
     obligation on the part of Parent or the Company or their respective
     officers or directors except (i) with respect to Section 5.6, this Section
     7.2 and Article VIII and (ii) with respect to any liabilities or damages
     incurred or suffered by a party as a result of the willful and material
     breach by the other party of any of its representations, warranties,
     covenants or other agreements set forth in this Agreement.
 
          (b) Parent and the Company agree that if this Agreement is terminated
     pursuant to Section 7.1(d), (e), (f) or (g), then the Company shall pay
     Parent an amount equal to the sum of Parent's Expenses up to an amount
     equal to $2 million.
 
          (c) Parent and the Company agree that if this Agreement is terminated
     pursuant to Section 7.1 (h), then Parent shall pay to the Company an amount
     equal to the sum of all of the Company's Expenses up to an amount equal to
     $2 million.
 
          (d) Payment of expenses pursuant to Section 7.2(b) or 7.2(c) shall be
     made not later than two Business Days after delivery to the other party of
     notice of demand for payment and a documented itemization setting forth in
     reasonable detail all Expenses of the party entitled to receive payment
     (which itemization may be supplemented and updated from time to time by
     such party until the 60th day after such party delivers such notice of
     demand for payment). All payments under this Section 7.2 shall be made by
     wire transfer of immediately available funds to an account designated by
     the party entitled to receive payment.
 
          (e) In addition to any payment required by the foregoing provisions of
     this Section: (1) in the event that this Agreement is terminated pursuant
     to Section 7.1(e) (other than clause (vii) thereof) or 7.1(f), then the
     Company shall pay to Parent immediately prior to such termination, in the
     case of a termination by the Company, or within two business days
     thereafter, in the case of a termination by Parent, a termination fee of
     $52.5 million; (2), in the event that this Agreement is terminated pursuant
     to Section 7.1(g) or clause (vii) of Section 7.1(e), then the Company shall
     pay Parent, no later than two days after the earlier to occur of (i) the
     date of entrance by the Company or any of its Subsidiaries into an
     agreement concerning a transaction
 
                                      A-41
<PAGE>   125
 
     that constitutes an Acquisition Proposal or (ii) the date any Person or
     Persons (other than Parent) purchases 20% or more of the assets or voting
     securities (in one or a series of transactions) of the Company and its
     Subsidiaries (provided that the entering of any definitive agreement
     referred to in clauses (i) and (ii) of this sentence is entered into by the
     Company or any of its Subsidiaries, or if there is no such agreement with
     respect to a purchase contemplated by clause (ii), any tender, exchange or
     other offer or arrangement for the Company's voting securities is first
     publicly disclosed, within 12 months of such termination of this Agreement;
     (provided further, however, that a financing transaction constituting a
     sale and leaseback of communications towers and related equipment shall not
     constitute a transaction under clause (i) or (ii) above.)), a termination
     fee of $52.5 million; and (3) in the event the Agreement is terminated
     pursuant to Section 7.1(d), and none of the events described in clauses (i)
     and (ii) of subsection (2) of this Section 7.2(e) has occurred, then the
     Company shall pay to Parent, upon such termination, a termination fee of
     $30 million, provided however that if, within 12 months of such termination
     of this Agreement, an event described in clauses (i) and (ii) of subsection
     (2) of this Section 7.2(e) occurs (other than a financing transaction
     constituting a sale and leaseback of communications towers and related
     equipment), then, no later than two days after the occurrence of any such
     event, the Company shall pay Parent an additional termination fee of $22.5
     million.
 
          (f) If this Agreement is terminated pursuant to Section 7.1(h) and the
     Company prior to the date of such termination consummated the Tender Offer,
     then Parent will pay the Company an amount equal to the product of (x) $3.5
     million and (y) the percentage of outstanding Debentures purchased under
     the Tender Offer, plus all Company Expenses which may be owed pursuant to
     Section 7.2(c). If this Agreement is terminated pursuant to Section 7.1(h)
     and the Company prior to the date of such termination irrevocably made the
     Deposit pursuant to Section 5.9(e) hereof, then Parent will pay the Company
     an amount equal to $4.5 million.
 
          (g) If this Agreement is terminated pursuant to Section 7.1(b) and the
     Company prior to the date of such termination consummated the Tender Offer,
     then Parent will pay the Company an amount equal to the product of (x)
     $1.75 million and (y) the percentage of outstanding Debentures purchased
     under the Tender Offer, plus all Company Expenses which may be owed
     pursuant to Section 7.2(c). If this Agreement is terminated pursuant to
     Section 7.1(b) and the Company prior to the date of such termination
     irrevocably made the Deposit pursuant to Section 5.9(e) hereof, then Parent
     will pay the Company an amount equal to $2.25 million.
 
     7.3  Amendment.  This Agreement may be amended by the parties hereto, by
action taken or authorized by their respective Boards of Directors, at any time
before or after approval of the matters presented in connection with the Merger
by the shareholders of the Company, but after any such approval, no amendment
shall be made which by law or in accordance with the rules of Nasdaq required
further approval by such shareholders without such further approval. This
Agreement may not be amended except by an instrument in writing signed on behalf
of each of the parties hereto.
 
     7.4  Extension; Waiver.  At any time prior to the Effective Time, the
parties hereto by action taken or authorized by their respective Boards of
Directors, may, to the extent legally allowed) (i) extend the time for the
performance of any of the obligations or other acts of the other parties hereto,
(ii) waive any inaccuracies in the representation and warranties contained
herein or in any document delivered pursuant hereto and (iii) waive compliance
with any of the agreements or conditions contained herein (other than the
condition set forth in Section 6.1(e) which shall be non-waivable). Any
agreement on the part of a party hereto to any such extension or waiver shall be
valid only if set forth in a written instrument signed on behalf of such party.
The failure of any party to this Agreement to assert any of its rights under
this Agreement or otherwise shall not constitute a waiver of those rights.
 
                                      A-42
<PAGE>   126
 
                                 ARTICLE VIII.
 
                               GENERAL PROVISIONS
 
     8.1  No Survival of Representations, Warranties and Agreements.  None of
the representations, warranties, covenants and other agreements in this
Agreement or in any instrument delivered pursuant to this Agreement, including
any rights arising out of any breach of such representations, warranties,
covenants and other agreements, shall survive the Effective Time, except for
those covenants and agreements contained herein and therein that by their terms
apply or are to be performed in whole or in part after the Effective Time and
this Article VIII. Nothing in this Section 8.1 shall relieve any party for any
breach of any representation, warranty, covenant or other agreement in this
Agreement occurring prior to termination.
 
     8.2  Notices.  All notices and other communications hereunder shall be in
writing and shall be deemed duly given (a) on the date of delivery if delivered
personally, (b) on the first Business Day following the date of dispatch if
delivered by a recognized next-day courier service, or (c) on the tenth Business
Day following the date of mailing if delivered by registered or certified mail,
return receipt requested, postage prepaid. All notices hereunder shall be
delivered as set forth below, or pursuant to such other instructions as may be
designated in writing by the party to receive such notice:
 
          (a) if to Parent or Merger Sub, to AT&T Corp., 295 North Maple Avenue,
     Basking Ridge, New Jersey, 07920, Attention: Marilyn Wasser, Facsimile No.
     (908) 221-6618 with copies to Wachtell, Lipton, Rosen & Katz, 51 West
     52(nd) Street, New York, New York, 10019, Attention: David M. Silk,
     Facsimile No. (212) 403-2000;
 
          (b) if to the Company, to Vanguard Cellular Systems, Inc., 2002 Pisgah
     Church Road, Suite 300, Greensboro, North Carolina, 27455, Attention:
     Richard C. Rowlenson, Facsimile No. (336) 545-2219 with a copy to Latham &
     Watkins, 885 Third Avenue, New York, New York, 10022, Attention: Raymond Y.
     Lin, Facsimile No.: (212) 751-4864.
 
     8.3  Interpretation.  When a reference is made in this Agreement to
Sections, Exhibits or Schedules, such reference shall be to a Section of or
Exhibit or Schedule to this Agreement unless otherwise indicated. The Table of
Contents, glossary of defined terms and headings contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Whenever the words "include", "includes" or
"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation".
 
     8.4  Counterparts.  This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and delivered to the other party, it being understood that both
parties need not sign the same counterpart.
 
     8.5  Entire Agreement; No Third Party Beneficiaries.
 
     (a) This Agreement constitutes the entire agreement and supersedes all
prior agreements and understandings, both written and oral, among the parties
with respect to the subject matter hereof, other than the confidentiality
agreement and Option Agreement entered into by Parent and the Company in
connection with the transactions contemplated hereby, which shall survive the
execution and delivery of this Agreement.
 
     (b) This Agreement shall be binding upon and inure solely to the benefit of
each party hereto, and nothing in this Agreement, express or implied, is
intended to or shall confer upon any other Person any right, benefit or remedy
of any nature whatsoever under or by reason of this Agreement, other than
Section 5.7 (which is intended to be for the benefit of the Persons covered
thereby and may be enforced by such Persons).
                                      A-43
<PAGE>   127
 
     8.6  Governing Law.  Except as to matters of internal corporation law,
which shall be governed by the laws of the State of North Carolina, in the case
of the Company, New York in the case of Parent and Delaware in the case of
Merger Sub, this Agreement shall be governed and construed in accordance with
the laws of the State of New York without giving effect to the principles of
choice-of-law thereof.
 
     8.7  Severability.  If any term or other provision of this Agreement is
invalid, illegal or incapable of being enforced by any law or public policy, all
other terms and provisions of this Agreement shall nevertheless remain in full
force and effect so long as the economic or legal substance of the transactions
contemplated hereby is not affected in any manner materially adverse to any
party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall 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 in order that the
transactions contemplated hereby are consummated as originally contemplated to
the greatest extent possible.
 
     8.8  Assignment.  Neither this Agreement nor any of the rights, interests
or obligations hereunder shall be assigned by any of the parties hereto, in
whole or in part (whether by operation of law or otherwise), without the prior
written consent of the other parties, and any attempt to make any such
assignment without such consent shall be null and void, except that Merger Sub
may assign, in its sole discretion, any or all of its rights, interests and
obligations under this Agreement to any direct or indirect wholly owned
Subsidiary of Parent without the consent of the Company, but no such assignment
shall relieve Merger Sub of any of its obligations under this Agreement. Subject
to the preceding sentence, this Agreement will be binding upon, inure to the
benefit of and be enforceable by the parties and their respective successors and
assigns.
 
     8.9  Enforcement.  The parties agree that irreparable damage would occur in
the event that any of the provisions of this Agreement were not performed in
accordance with their specific terms. It is accordingly agreed that the parties
shall be entitled to specific performance of the terms hereof, this being in
addition to any other remedy to which they are entitled at law or in equity.
 
     8.10  Definitions.  As used in this Agreement:
 
          (a) "Board of Directors" means the Board of Directors of any specified
     Person and any properly serving and acting committees thereof.
 
          (b) "Business Day" means any day on which banks are not required or
     authorized to close in the City of New York.
 
          (c) "Material Adverse Effect" means, with respect to any entity, any
     adverse change, circumstance or effect that, individually or in the
     aggregate with all other adverse changes, circumstances and effects, is or
     is reasonably likely to be materially adverse to the business, operations,
     assets, liabilities (including, without limitation, contingent
     liabilities), financial condition or results of operations of such entity
     and its Subsidiaries taken as a whole or could reasonably be expected to
     prevent or materially delay (beyond the Outside Date) consummation of the
     transactions contemplated by this Agreement, other than any such changes,
     circumstances and effects to the extent arising out of changes,
     circumstances or effects occurring after, which did not occur before, the
     Approval Satisfaction Date from (i) general economic conditions, or (ii)
     changes in the wireless communications business generally that do not, in
     either case, significantly disproportionately affect the Company.
 
          (d) "Approval Satisfaction Date" means the date not before six months
     from the date hereof, on which all conditions to the Closing under Section
     6.1 and 6.2 have been satisfied or waived (other than 6.1(d), 6.1(e),
     6.1(f) and 6.1(a), provided that the failure to satisfy 6.1(a)
 
                                      A-44
<PAGE>   128
 
     is due to Parent's failure to cause 6.1(d) to occur and not as a result of
     the Company's actions or failure to take action).
 
          (e) "Final Order" means an order of the FCC approving the transfer of
     control with respect to all FCC licenses, permits and other authorizations
     held by the Company, and shall be deemed to be a Final Order when the time
     for the filing of any protest, request for stay, petition or request for
     reconsideration, petition for rehearing or appeal of such FCC order to the
     FCC or any Governmental Authority having jurisdiction over such order, and
     the time for review or reconsideration by the FCC on its own motion, has
     expired and no protest, request for stay, petition or request for
     reconsideration, petition for rehearing or appeal or review of such order
     is pending.
 
          (f) "Knowledge" or "to the knowledge" of the Company means the actual
     knowledge of any of the persons specified in Schedule 8.10(f) after
     reasonable inquiry.
 
          (g) "the other party" means, with respect to the Company, Parent and
     means, with respect to Parent, the Company.
 
          (h) "Organizational Documents" means, with respect to any entity, the
     articles of incorporation, by-laws, partnership or limited liability
     company agreement and other governing documents of such entity, as
     applicable.
 
          (i) "Person" means an individual, corporation, partnership,
     association, trust, unincorporated organization, entity or group (as
     defined in the Exchange Act).
 
          (j) "Required Consents" means the consents to the agreements set forth
     in Schedule 8.10(j).
 
          (k) "Subsidiary" when used with respect to any party means any
     corporation, partnership or other organization, whether incorporated or
     unincorporated, (i) of which such party or any other Subsidiary of such
     party is a general partner (excluding partnerships, the general partnership
     interests of which held by such party or any Subsidiary of such party do
     not have a majority of the voting and economic interests in such
     partnership) or (ii) at least a majority of the securities or other
     interests of which having by their terms ordinary voting power to elect a
     majority of the Board of Directors or others performing similar functions
     with respect to such corporation, partnership or other organization is
     directly or indirectly owned or controlled by such party or by any one or
     more of its Subsidiaries, or by such party and one or more of its
     Subsidiaries. Notwithstanding the above, nothing contained in this
     Agreement shall be construed such that International Wireless Corporation
     Holdings, Inc. or any of its subsidiaries may be deemed to be a Subsidiary
     of the Company.
 
          (l) (i) "Tax" (including, with correlative meaning, the terms "Taxes"
     and "Taxable") means all federal, state, local and foreign income, profits,
     franchise, gross receipts, environmental, customs duty, capital stock,
     severance, stamp, payroll, sales, employment, unemployment disability, use,
     property, withholding, excise, production, value added, occupancy and other
     taxes, duties or assessments of any nature whatsoever, together with all
     interest, penalties, fines and additions to tax imposed with respect to
     such amounts and any interest in respect of such penalties and additions to
     tax, and (ii) "Tax Return" means all returns and reports (including
     elections, claims, declarations, disclosures, schedules, estimates,
     computations and information returns) required to be supplied to a Tax
     authority in any jurisdiction relating to Taxes.
 
          (m) "Company Disclosure Schedule" means a disclosure schedule
     delivered by the Company to Parent at the execution of this Agreement,
     which is incorporated by reference into, and constitutes a part of, this
     Agreement. Reference to particular "Schedules" are references to schedules
     contained in the Company Disclosure Schedule.
 
                                      A-45
<PAGE>   129
 
     IN WITNESS WHEREOF, Parent, the Company and Merger Sub have caused this
Agreement to be signed by their respective officers thereunto duly authorized,
all as of October 2, 1998.
 
                                          AT&T CORP.
 
                                          By: /s/ MICHAEL BERG
                                            ------------------------------------
                                              Name: Michael Berg
                                              Title:  General Attorney and
                                                      Assistant Secretary
 
                                          WINSTON, INC.
 
                                          By: /s/ MICHAEL BERG
                                            ------------------------------------
                                              Name: Michael Berg
                                              Title:  Vice President
 
                                          VANGUARD CELLULAR SYSTEMS, INC.
 
                                          By: /s/ STEPHEN R. LEEOLOU
                                            ------------------------------------
                                              Name: Stephen R. Leeolou
                                              Title: President and Chief
                                                     Executive Officer
 
                                      A-46
<PAGE>   130
 
                                                                      APPENDIX B
 
                                OPTION AGREEMENT
 
     OPTION AGREEMENT, dated as of October 2, 1998 (the "Agreement"), by and
between Vanguard Cellular Systems, Inc., a North Carolina corporation
("Issuer"), and AT&T Corp., a New York corporation ("Grantee").
 
     WHEREAS, Issuer and Grantee have entered into an Agreement and Plan of
Merger, dated as of the date hereof (the "Merger Agreement"), providing for,
among other things, the merger of Issuer with and into a subsidiary of Grantee
with such subsidiary as the surviving corporation in the Merger; and
 
     WHEREAS, as a condition and inducement to Grantee's willingness to enter
into the Merger Agreement, Grantee has requested that Issuer agree, and Issuer
has agreed, to grant Grantee the Option, on the terms set forth herein; and
 
     WHEREAS, terms not defined herein shall have the meanings set forth in the
Merger Agreement;
 
     NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth herein Issuer
and Grantee agree as follows:
 
          1.  Grant of Option.  Subject to the terms and conditions set forth
     herein, Issuer hereby grants to Grantee an irrevocable option (the
     "Option") to purchase up to 7,319,000 (as adjusted as set forth herein)
     shares of Class A Common Stock, par value $0.01 per share ("Issuer Common
     Stock"), of Issuer at a purchase price of $23 (as adjusted as set forth
     herein) per Option Share (the "Purchase Price").
 
          2.  Exercise of Option.  (a) Grantee may exercise the Option, in whole
     or in part, at any time and from time to time, after the occurrence of any
     event as a result of which the Grantee shall be entitled to receive a
     termination fee pursuant to Section 7.2(e) of the Merger Agreement in the
     amount of $52.5 million pursuant to part (1) or part (2) of such Section or
     in the amount of $22.5 million pursuant to part (3) of such Section (a
     "Purchase Event"); provided, however, that except as provided in the last
     sentence of this Section 2(a), the Option shall terminate and be of no
     further force and effect upon the earliest to occur of (A) the Effective
     Time, (B) 12 months and one day after the occurrence of a termination of
     the Merger Agreement in accordance with Section 7.1 (d), (e), (f) or (g)
     and (C) a termination of the Merger Agreement in accordance with Section
     7.1(a), (b), (c) or (h) of the Merger Agreement. Notwithstanding the
     termination of the Option, Grantee shall be entitled to exercise the Option
     or have the Option repurchased if it has duly given notice of its intent to
     exercise the Option or have the Option repurchased in accordance with the
     terms hereof prior to the termination of the Option and the termination of
     the Option shall not affect any rights hereunder which by their terms do
     not terminate or expire prior to or as of such termination.
 
          (b) In the event that Grantee wishes to exercise the Option, it shall
     send to Issuer a written notice (the date of which being herein referred to
     as the "Notice Date") to that effect which notice also specifies the total
     number of shares the Grantee will purchase pursuant to such exercise and a
     date not earlier than three business days nor later than 15 business days
     from the Notice Date for the closing of such purchase (the "Option Closing
     Date"); provided, however, that (i) if the closing of the purchase and sale
     pursuant to the Option (the "Option Closing") cannot be consummated by
     reason of any applicable judgment, decree, order, law or regulation
     (including, without limitation, the rules and regulations of the FCC), the
     period of time that otherwise would run pursuant to this sentence shall run
     instead from the date on which such
 
                                       B-1
<PAGE>   131
 
     restriction on consummation has expired or been terminated and (ii) without
     limiting the foregoing, if prior notification to or approval of any
     Governmental Entity is required in connection with such purchase or any
     other transaction contemplated hereby, Grantee and Issuer shall promptly
     file the required notice or application for approval and shall cooperate in
     the expeditious filing of such notice or application, and, in the case of
     any prior notification or approval required in connection with such
     purchase, the period of time that otherwise would run pursuant to this
     sentence shall run instead from the date on which, as the case may be, (A)
     any required notification period has expired or been terminated or (B) any
     required approval has been obtained, and in either event, any requisite
     waiting period has expired or been terminated. The place of the Option
     Closing shall be at the offices of Wachtell, Lipton, Rosen & Katz, 51 West
     52nd Street, New York, New York, and the time of the Option Closing shall
     be 10:00 a.m. (Eastern Time) on the Option Closing Date.
 
          3.  Payment and Delivery of Certificates.  (a) At the Option Closing,
     Grantee shall pay to Issuer in immediately available funds by wire transfer
     to a bank account designated in writing by Issuer an amount equal to the
     product of (x) the Purchase Price and (y) the number of shares being
     purchased pursuant to the exercise of the Option.
 
          (b) At the Option Closing, simultaneously with the delivery of
     immediately available funds as provided in Section 3(a), Issuer shall
     deliver to Grantee a certificate or certificates representing the shares to
     be purchased at the Option Closing, which shares shall be free and clear of
     all liens, claims, charges and encumbrances of any kind whatsoever and a
     new Option evidencing the rights of the Grantee to purchase the balance of
     the shares purchasable hereunder.
 
          (c) Certificates for the shares delivered at the Option Closing shall
     have typed or printed thereon a restrictive legend which shall read
     substantially as follows (if and to the extent true and necessary in light
     of legal and factual circumstances existing at such time):
 
        "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
        UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY BE REOFFERED OR
        SOLD ONLY IF SO REGISTERED OR IF AN EXEMPTION FROM SUCH REGISTRATION IS
        AVAILABLE. SUCH SECURITIES ARE ALSO SUBJECT TO CERTAIN PROVISIONS AS SET
        FORTH IN THE STOCK OPTION AGREEMENT, DATED AS OF OCTOBER 2, 1998, A COPY
        OF WHICH MAY BE OBTAINED FROM THE SECRETARY OF VANGUARD CELLULAR
        SYSTEMS, INC. AT ITS PRINCIPAL EXECUTIVE OFFICES."
 
     It is understood and agreed that: (i) the reference to the resale
     restrictions of the Securities Act of 1933, as amended (the "1933 Act"), in
     the above legend shall be removed by delivery of substitute certificate(s)
     without such reference if Grantee shall have delivered to Issuer a copy of
     a letter from the staff of the SEC, or an opinion of counsel, in form and
     substance reasonably satisfactory to Issuer, to the effect that such legend
     is not required for purposes of the 1933 Act; (ii) the reference to the
     provisions to this Agreement in the above legend shall be removed by
     delivery of substitute certificate(s) without such reference if the shares
     have been sold or transferred in compliance with the provisions of this
     Agreement and under circumstances that do not require the retention of such
     reference; and (iii) the legend shall be removed in its entirety if the
     conditions in the preceding clauses (i) and (ii) are both satisfied. In
     addition, such certificates shall bear any other legend as may be required
     by law.
 
          4.  Option Repurchase.  (a) Upon the occurrence of a Purchase Event
     prior to the termination of the Option, in lieu of exercising the Option,
     Grantee may require Issuer to
 
                                       B-2
<PAGE>   132
 
     repurchase the Option. If Grantee so elects, Issuer (or any successor
     thereto) shall repurchase the Option from Grantee at a price (the "Option
     Repurchase Price") equal to the amount by which (A) the Market/Offer Price
     (as defined below) exceeds (B) the Option Price, multiplied by the number
     of shares for which this Option may then be exercised. The term
     "Market/Offer Price" shall mean the highest of (i) the price per share of
     Issuer Common Stock at which a tender offer or exchange offer therefor has
     been made, (ii) the highest price per share of Issuer Common Stock to be
     paid by any third party pursuant to an agreement with Issuer, (iii) the
     highest closing price for shares of Issuer Common Stock within the
     six-month period immediately preceding the date Grantee gives notice of the
     required repurchase of this Option, or (iv) in the event of a sale of all
     or a substantial portion of Issuer's assets, the sum of the price paid in
     such sale for such assets and the current market value of the remaining
     assets of Issuer as determined by a nationally recognized investment
     banking firm selected by Grantee, as the case may be, and reasonably
     acceptable to the Issuer, divided by the number of shares of Issuer Common
     Stock of Issuer outstanding at the time of such sale. In determining the
     Market/Offer Price, the value of consideration other than cash shall be
     determined by a nationally recognized investment banking firm selected by
     Grantee, as the case may be, and reasonably acceptable to the Issuer.
 
          (b) The Grantee may exercise its right to require Issuer to repurchase
     the Option pursuant to this Section by surrendering for such purpose to
     Issuer, at its principal office, a copy of this Agreement, accompanied by a
     written notice or notices stating that Grantee elects to require Issuer to
     repurchase this Option in accordance with the provisions of this Section.
     Within five business days after the surrender of the Option and the receipt
     of such notice or notices relating thereto, Issuer shall deliver or cause
     to be delivered to Grantee the Option Repurchase Price therefor or the
     portion thereof, if any, that Issuer is not then prohibited under
     applicable law and regulation from so delivering.
 
          To the extent that Issuer is prohibited under applicable law or
     regulation from repurchasing, or requires any approval of its stockholders
     to repurchase, the Option in full, Issuer shall immediately so notify
     Grantee and thereafter deliver or cause to be delivered, from time to time,
     to Grantee the portion of the Option Repurchase Price that it is no longer
     prohibited from delivering, within five business days after the date on
     which Issuer is no longer so prohibited; provided, however, that if Issuer
     at any time after delivery of a notice of repurchase pursuant to this
     Section is prohibited under applicable law or regulation from delivering,
     or requires any approval of its stockholders to deliver, to Grantee, the
     Option Repurchase Price in full (and Issuer hereby undertakes to use its
     best efforts to obtain such approval of its stockholders and all required
     regulatory and legal approvals and to file any required notices, in each
     case as promptly as practicable in order to accomplish such repurchase),
     Grantee may revoke its notice of repurchase of the Option either in whole
     or to the extent of the prohibition, whereupon, in the latter case, Issuer
     shall promptly (i) deliver to Grantee, that portion of the Option
     Repurchase Price that Issuer is not prohibited from delivering; and (ii)
     deliver to Grantee, a new Stock Option Agreement evidencing the right of
     Grantee to purchase that number of shares of Issuer Common Stock obtained
     by multiplying the number of shares of Issuer Common Stock for which the
     surrendered Stock Option Agreement was exercisable at the time of delivery
     of the notice of repurchase by a fraction, the numerator of which is the
     Option Repurchase Price less the portion thereof theretofore delivered to
     the Holder and the denominator of which is the Option Repurchase Price. In
     such event, notwithstanding anything to the contrary contained herein, the
     Option shall not terminate until at least five business day have passed
     from receipt by Grantee of the notice and portion of the Option Repurchase
     Price contemplated by the first sentence of this paragraph.
 
                                       B-3
<PAGE>   133
 
          Notwithstanding anything to the contrary contained herein, in no event
     shall the sum of the Option Repurchase Price and the termination fee
     pursuant to Section 7.2(e) of the Merger Agreement received by the Grantee
     from the Issuer exceed $53 million and, if such sum otherwise would exceed
     such amount, the Option Repurchase Price shall be reduced such that the sum
     of the Option Repurchase Price and the Termination Fee equals $53 million.
 
          5.  Representations and Warranties of Issuer.  Issuer hereby
     represents and warrants to Grantee as follows:
 
             (a) Due Authorization.  Issuer has all requisite corporate power
        and authority to enter into this Agreement and to consummate the
        transactions contemplated hereby. The execution and delivery of this
        Agreement by Issuer and the consummation by Issuer of the transactions
        contemplated hereby have been duly authorized by all necessary corporate
        action on the part of Issuer. This Agreement has been duly executed and
        delivered by Issuer and constitutes a legal, valid and binding
        obligation of Issuer, enforceable against Issuer in accordance with its
        terms.
 
             (b) Authorized Stock.  Issuer's representations and warranties in
        the Merger Agreement are incorporated herein by reference. Without
        limiting the generality or effect of the foregoing, Issuer has taken all
        necessary corporate and other action to authorize and reserve, and to
        permit it to issue, and, at all times from the date hereof until the
        obligation to deliver shares upon the exercise of the Option terminates,
        shall have reserved for issuance, upon exercise of the Option, shares of
        Issuer Common Stock necessary for Grantee to exercise the Option, and
        Issuer shall take all necessary corporate action to authorize and
        reserve for issuance all additional shares of Issuer Common Stock or
        other securities which may be issued pursuant to Section 7 upon exercise
        of the Option. The shares of Issuer Common Stock to be issued upon due
        exercise of the Option, including all additional shares of Issuer Common
        Stock or other securities which may be issuable upon exercise of the
        Option or any substitute option pursuant to Section 7, upon issuance
        pursuant hereto, shall be duly and validly issued, fully paid and
        nonassessable, and shall be delivered free and clear of all liens,
        claims, charges and encumbrances of any kind or nature whatsoever,
        including without limitation any preemptive rights of any stockholder of
        Issuer, and the holder thereof shall be entitled to all rights and
        privileges (without limitation) relating to shares of Issuer Common
        Stock generally, including with respect to voting and disposition.
 
             (c) No Conflicts.  The execution and delivery of this Agreement
        does not, and the consummation of the transactions contemplated by this
        Agreement and compliance with the provisions of this Agreement shall
        not, conflict with, or result in any violation of, or default (with or
        without notice or lapse of time or both) under, or give rise to a right
        of termination, cancellation, or acceleration of any obligation or loss
        of a material benefit under, or result in the creation of any Lien upon
        any of the properties or assets of Issuer or any of its Significant
        Subsidiaries under, (i) the certificate of incorporation or by-laws of
        Issuer or the comparable organizational documents of any Significant
        Subsidiary of Issuer, (ii) any loan or credit agreement, note, bond,
        mortgage, indenture, lease or other agreement, instrument, permit,
        concession, franchise, or license applicable to Issuer or any
        Significant Subsidiary of Issuer or their respective properties or
        assets (without prejudice to the Company's obligations hereunder, other
        than covenant restrictions contained in the Indenture with respect to
        the Company's 9 3/8% Debentures due 2006 and the Company's bank credit
        facility with the banks named therein, each of which the Company hereby
        covenants to use its best efforts to have waived), or (iii) any
        judgment, order, decree, statute, law, ordinance, rule, or regulation
        applicable to Issuer or any of its Significant
 
                                       B-4
<PAGE>   134
 
        Subsidiaries or their respective properties or assets, other than, in
        the case of clauses (ii) and (iii), any such conflicts, violations,
        defaults, rights, losses, or Liens that individually or in the aggregate
        would not (x) have a material adverse effect on Issuer, (y) impair the
        ability of Issuer to perform its obligations under this Agreement or the
        Merger Agreement or (z) prevent or materially delay the consummation of
        any of the transactions contemplated by this Agreement.
 
             (d) State Takeover Statutes.  The Board of Directors of Issuer has
        taken all action necessary or advisable so as to render inoperative with
        respect to the transactions contemplated hereby all applicable state
        anti-takeover statutes.
 
          6.  Representations and Warranties of Grantee.  Grantee hereby
     represents and warrants to Issuer that:
 
             (a) Due Authorization.  Grantee has all requisite corporate power
        and authority to enter into this Agreement and to consummate the
        transactions contemplated hereby. The execution and delivery of this
        Agreement by Grantee and the consummation by Grantee of the transactions
        contemplated hereby have been duly authorized by all necessary corporate
        action on the part of Grantee. This Agreement has been duly executed and
        delivered by Grantee and constitutes a legal, valid and binding
        obligation of Grantee, enforceable against Grantee in accordance with
        its terms.
 
             (b) No Conflicts.  The execution and delivery of this Agreement
        does not, and the consummation of the transactions contemplated by this
        Agreement and compliance with the provisions of this Agreement hereby
        shall not, conflict with or result in any violation of, or default (with
        or without notice or lapse of time or both) under, or give rise to a
        right of termination, cancellation, or acceleration of any obligation or
        loss of a material benefit under, or result in the creation of any Lien
        upon any of the properties or assets of Grantee or any of its
        Significant Subsidiaries under, (i) the certificate of incorporation or
        by-laws of Grantee or the comparable organizational documents of any
        Significant Subsidiary of Grantee, (ii) any loan or credit agreement,
        note, bond, mortgage, indenture, lease or other agreement, instrument,
        permit, concession, franchise, or license applicable to Grantee or any
        Significant Subsidiary of Grantee or their respective properties or
        assets, or (iii) any judgment, order, decree, statute, law, ordinance,
        rule, or regulation applicable to Grantee or any of its Significant
        Subsidiaries or their respective properties or assets, other than, in
        the case of clauses (ii) and (iii), any such conflicts, violations,
        defaults, rights, losses, or Liens that individually or in the aggregate
        would not (x) have a material adverse effect on Grantee, (y) impair the
        ability of Grantee to perform its obligations under this Agreement or
        the Merger Agreement or (z) prevent or materially delay the consummation
        of any of the transactions contemplated by this Agreement.
 
             (c) Purchase Not for Distribution.  Any shares or other securities
        acquired by Grantee upon exercise of the Option are acquired for its own
        account, and shall not be transferred or otherwise disposed of except in
        a transaction registered, or exempt from registration, under the
        Securities Act.
 
          7.  Adjustment upon Changes in Capitalization, Etc.  (a) In the event
     of any change in Issuer Common Stock by reason of a stock dividend,
     split-up, merger, recapitalization, combination, exchange of shares, or
     similar or other transaction, the type and number of shares or securities
     subject to the Option, and the Purchase Price therefor, shall be adjusted
     appropriately, and proper provision shall be made in the agreements
     governing such transaction, so that Grantee shall receive upon exercise of
     the Option the number and class of shares or other securities or property
     that Grantee would have received in respect of Issuer Common
 
                                       B-5
<PAGE>   135
 
     Stock if the Option had been exercised immediately prior to such event or
     the record date therefor, as applicable. Subject to Section 1, and without
     limiting the parties' relative rights and obligations under the Merger
     Agreement, if any additional shares of Issuer Common Stock are issued or
     cease to be issued and outstanding after the date of this Agreement (other
     than pursuant to an event described in the first sentence of this Section
     7(a)), the number of shares of Issuer Common Stock subject to the Option
     shall be adjusted so that, after such issuance or ceasing to be issued and
     outstanding, it equals 19.9% of the number of shares of Issuer Common Stock
     then issued and outstanding, without giving effect to any shares subject to
     or issued pursuant to the Option.
 
          (b) Without limiting the parties' relative rights and obligations
     under the Merger Agreement, in the event that Issuer enters into an
     agreement (i) to consolidate with or merge into any person, other than
     Grantee or one of its subsidiaries, and Issuer shall not be the continuing
     or surviving corporation in such consolidation or merger, (ii) to permit
     any person, other than Grantee or one of its subsidiaries, to merge into
     Issuer and Issuer shall be the continuing or surviving corporation, but in
     connection with such merger, the shares of Issuer Common Stock outstanding
     immediately prior to the consummation of such merger shall be changed into
     or exchanged for stock or other securities of Issuer or any other person or
     cash or any other property, or the shares of Issuer Common Stock
     outstanding immediately prior to the consummation of such merger shall,
     after such merger, represent less than 50% of the outstanding voting
     securities of the merged company, or (iii) to sell or otherwise transfer
     all or substantially all of its assets to any person, other than Grantee or
     one of its subsidiaries, then, and in each such case, the agreement
     governing such transaction shall make proper provision so that the Option
     shall, upon the consummation of any such transaction and upon the terms and
     conditions set forth herein, be converted into, or exchanged for, an option
     with identical terms appropriately adjusted to acquire the number and class
     of shares or other securities or property that Grantee would have received
     in respect of Issuer Common Stock if the Option had been exercised
     immediately prior to such consolidation, merger, sale, or transfer, or the
     record date therefor, as applicable.
 
          8.  Registration Rights.  Upon the occurrence of a Purchase Event that
     occurs prior to the termination of the Option, Issuer shall, at the request
     of Grantee, promptly prepare, file and keep current a shelf registration
     statement under the 1933 Act covering any shares issued and issuable
     pursuant to this Option and shall use its reasonable best efforts to cause
     such registration statement to become effective and remain current in order
     to permit the sale or other disposition of any shares of Issuer Common
     Stock issued upon total or partial exercise of this Option ("Option
     Shares"), or shares acquired under the Voting Agreement, in accordance with
     any plan of disposition requested by Grantee. Issuer will use its
     reasonable best efforts to cause such registration statement first to
     become effective and then to remain effective for such period not in excess
     of 180 days from the day such registration statement first becomes
     effective or such shorter time as may be reasonably necessary to effect
     such sales or other dispositions. Grantee shall have the right to demand
     two such registrations. Grantee shall provide all information reasonably
     requested by Issuer for inclusion in any registration statement to be filed
     hereunder. If requested by Grantee in connection with such registration,
     Issuer shall become a party to any underwriting agreement relating to the
     sale of such shares, but only to the extent of obligating itself in respect
     of representations, warranties, indemnities and other agreements
     customarily included in secondary offering underwriting agreements for the
     Issuer.
 
          9.  Listing.  If Issuer Common Stock or any other securities to be
     acquired upon exercise of the Option are then listed on Nasdaq (or any
     other national securities exchange or national securities quotation
     system), Issuer, upon the request of Grantee, shall promptly file an
     application to list the shares of Issuer Common Stock or other securities
     to be acquired upon
 
                                       B-6
<PAGE>   136
 
     exercise of the Option on Nasdaq (and any such other national securities
     exchange or national securities quotation system) and shall use reasonable
     efforts to obtain approval of such listing as promptly as practicable.
 
          10.  Loss or Mutilation.  Upon receipt by Issuer of evidence
     reasonably satisfactory to it of the loss, theft, destruction or mutilation
     of this Agreement, and (in the case of loss, theft or destruction) of
     reasonably satisfactory indemnification, and upon surrender and
     cancellation of this Agreement, if mutilated, Issuer shall execute and
     deliver a new Agreement of like tenor and date. Any such new Agreement
     executed and delivered shall constitute an additional contractual
     obligation on the part of Issuer, whether or not the Agreement so lost,
     stolen, destroyed, or mutilated shall at any time be enforceable by anyone.
 
          11.  Miscellaneous.
 
          (a) Expenses.  Except as otherwise provided in the Merger Agreement,
     each of the parties hereto shall bear and pay all costs and expenses
     incurred by it or on its behalf in connection with this Agreement and the
     transactions contemplated hereunder, including fees and expenses of its own
     financial consultants, investment bankers, accountants and counsel.
 
          (b) Amendment.  This Agreement may not be amended, except by an
     instrument in writing signed on behalf of each of the parties.
 
          (c) GOVERNING LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS
     THEREOF; PROVIDED, HOWEVER, THAT THE LAWS OF THE RESPECTIVE STATES OF
     INCORPORATION OF EACH OF THE PARTIES HERETO SHALL GOVERN THE RELATIVE
     RIGHTS, OBLIGATIONS, POWERS, DUTIES AND OTHER INTERNAL AFFAIRS OF SUCH
     PARTY AND ITS BOARD OF DIRECTORS.
 
          (d) Severability.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid by a court of competent jurisdiction, the remainder of the
     provision held invalid and the application of such provision to persons or
     circumstances, other than the party as to which it is held invalid, shall
     not be affected.
 
          (e) Counterparts.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.
 
          (f) Headings.  All Section headings are for convenience of reference
     only and are not part of this Agreement and no construction or reference
     shall be derived therefrom.
 
          (g) Extension; Waiver.  Any agreement on the part of a party to waive
     any provision of this Agreement, or to extend the time for performance,
     shall be valid only if set forth in an instrument in writing signed on
     behalf of such party. The failure of any party to this Agreement to assert
     any of its rights under this Agreement or otherwise shall not constitute a
     waiver of such rights.
 
          (h) Entire Agreement; No Third-Party Beneficiaries.  This Agreement,
     the Voting Agreement and the Merger Agreement (including the documents and
     instruments referred to therein) and the confidentiality agreement entered
     into by Issuer and Grantee in connection with the transactions contemplated
     by the Merger Agreement (i) constitute the entire agreement, and supersede
     all prior agreements and understandings, both written and oral, between the
     parties with respect to the subject matter of such agreements and (ii)
     except as expressly otherwise
 
                                       B-7
<PAGE>   137
 
     provided herein or in the Voting Agreement or the Merger Agreement, are not
     intended to confer upon any person other than the parties any rights or
     remedies.
 
          (i) Notices.  All notices, requests, claims, demands, and other
     communications under this Agreement must be in writing and shall be deemed
     given if delivered personally, telecopied (which is confirmed), or sent by
     overnight courier (providing proof of delivery) to the parties at the
     following addresses (or at such other address for a party as shall be
     specified by like notice):
 
          (i) if to Grantee, to
 
              AT&T Corp.
              295 North Maple Avenue
              Basking Ridge, New Jersey 07920
              Telecopy No.: (908) 221-6618
              Attention: Marilyn Wasser
 
              with copies to:
 
              Wachtell, Lipton, Rosen & Katz
              51 West 52nd Street
              New York, New York 10019
              Telecopy No.: (212) 403-2000
              Attention: David M. Silk; and
 
          (ii) if to Issuer, to
 
               Vanguard Cellular Systems, Inc.
               2002 Pisgah Church Road
               Greensboro, NC 27455
               Telecopy No.: (336) 545-2219
               Attention: Richard Rowlenson
 
               with a copy to:
 
               Latham & Watkins
               53rd at Third Avenue, Suite 1000
               885 Third Avenue
               New York, NY 10022-4802
               Telecopy No.: (212) 751-4864
               Attention: Raymond Y. Lin.
 
          (j) Assignment.  Neither this Agreement nor any of the rights,
     interests, or obligations under this Agreement may be assigned or
     delegated, in whole or in part, by operation of law or otherwise, by Issuer
     without the prior written consent of Grantee, and Grantee may assign or
     delegate, in whole or in part, any of its rights hereunder. Any assignment
     or delegation in violation of the preceding sentence shall be void.
 
          (k) Further Assurances.  In the event of any exercise of the Option by
     Grantee, Issuer and Grantee shall execute and deliver all other documents
     and instruments and take all other action that may be reasonably necessary
     in order to consummate the transactions provided for by such exercise.
 
          (l) ENFORCEMENT.  THE PARTIES AGREE THAT IRREPARABLE DAMAGE WOULD
     OCCUR AND THAT THE PARTIES WOULD NOT HAVE ANY ADEQUATE REMEDY AT LAW IN THE
     EVENT THAT ANY OF THE PROVISIONS OF THIS AGREEMENT WERE NOT PERFORMED IN
     ACCORDANCE WITH THEIR SPECIFIC TERMS OR WERE OTHERWISE BREACHED. IT IS
     ACCORDINGLY AGREED THAT THE PARTIES SHALL BE ENTITLED TO AN INJUNCTION OR
     INJUNCTIONS TO
                                       B-8
<PAGE>   138
 
     PREVENT BREACHES OF THIS AGREEMENT AND TO ENFORCE SPECIFICALLY THE TERMS
     AND PROVISIONS OF THIS AGREEMENT IN ANY FEDERAL COURT LOCATED IN THE STATE
     OF NEW YORK OR IN NEW YORK STATE COURT, THE FOREGOING BEING IN ADDITION TO
     ANY OTHER REMEDY TO WHICH THEY ARE ENTITLED AT LAW OR IN EQUITY.
 
     IN WITNESS WHEREOF, Issuer and Grantee have caused this Agreement to be
signed by their respective officers thereunto duly authorized as of the day and
year first written above.
 
                                          VANGUARD CELLULAR SYSTEMS, INC.
 
                                          By: /s/ STEPHEN R. LEEOLOU
                                            ------------------------------------
                                              Name: Stephen R. Leeolou
                                              Title: President and Chief
                                              Executive Officer
 
                                          AT&T CORP.
 
                                          By: /s/ MICHAEL BERG
                                            ------------------------------------
                                              Name: Michael Berg
                                              Title: Assistant Secretary
 
                                       B-9
<PAGE>   139
 
                                                                      APPENDIX C
 
                [Letterhead of Wasserstein Perella & Co., Inc.]
 
                                October 2, 1998
 
Board of Directors
Vanguard Cellular Systems, Inc.
2002 Pisgah Church Road, Suite 300
Greensboro, North Carolina 27455
 
Members of the Board:
 
     You have asked us to advise you with respect to the fairness, from a
financial point of view, to the stockholders of Vanguard Cellular Systems, Inc.,
a North Carolina corporation (the "Company") (other than AT&T Corp., a New York
corporation (the "Parent")) of the consideration to be received by such holders
pursuant to the terms of the Agreement and Plan of Merger, dated as of October
2, 1998 (the "Merger Agreement"), among the Company, the Parent and Winston,
Inc., a Delaware corporation and a wholly owned subsidiary of Parent ("Merger
Sub"). The Merger Agreement provides for, among other things, a merger of the
Company with and into the Merger Sub (the "Merger") pursuant to which each
outstanding share of Class A Common Stock, par value $0.01 per share, of the
Company (other than any such shares held by the Company or any wholly owned
subsidiary of the Company (as treasury stock or otherwise)) (the "Company Common
Stock") will be converted into the right to receive (i) $23.00 in cash, without
interest (the "Cash Election") or (ii) 0.3987 shares of Common Stock, par value
$1.00 per share of Parent (the "Parent Common Stock") (the "Stock Election"), or
(iii) a combination or cash and Parent Common Stock as set forth in the Merger
Agreement ((i) (ii) and (iii) collectively, the "Merger Consideration"). The
terms and conditions of the Merger are set forth in more detail in the Merger
Agreement.
 
     In connection with rendering our opinion, we have reviewed the Merger
Agreement. We have also reviewed and analyzed certain publicly available
business and financial information relating to the Company and Parent for recent
years and interim periods to date, as well as certain internal financial and
operating information, including financial forecasts, analyses and projections
prepared by or on behalf of the Company and provided to us for purposes of our
analysis, and we have met with management of the Company and Parent to review
and discuss such information and, among other matters, each of the Company's and
Parent's business, operations, assets, financial condition and future prospects.
 
     We have reviewed and considered certain financial and stock market data
relating to the Company and Parent, and we have compared that data with similar
data for certain other companies, the securities of which are publicly traded,
that we believe may be relevant or comparable in certain respects to the Company
and Parent or one or more of their respective businesses or assets, and we have
reviewed and considered the financial terms of certain recent acquisitions and
business combination transactions in the cellular telephone industry
specifically, and in other industries generally, that we believe to be
reasonably comparable to the Merger or otherwise relevant to our inquiry. We
have also performed such other financial studies, analyses, and investigations
and reviewed such other information as we considered appropriate for purposes of
this opinion.
 
     In our review and analysis and in formulating our opinion, we have assumed
and relied upon the accuracy and completeness of all of the financial and other
information provided to or discussed with
 
                                       C-1
<PAGE>   140
 
us or publicly available, and we have not assumed any responsibility for
independent verification of any of such information. We have also assumed and
relied upon the reasonableness and accuracy of the financial projections,
forecasts and analyses provided to us and we have assumed that such projections,
forecasts and analyses were reasonably prepared in good faith and on bases
reflecting the best currently available judgments and estimates of the Company's
management. We express no opinion with respect to such projections, forecasts
and analyses or the assumptions upon which they are based. In addition, we have
not reviewed any of the books and records of the Company or Parent, or assumed
any responsibility for conducting a physical inspection of the properties or
appraisal of the assets or liabilities of the Company or Parent, and no such
independent valuation or appraisal was provided to us. We note that the Merger
is intended to qualify as a reorganization within the meaning of Section 368(a)
of the Internal Revenue Code of 1986, as amended, and we have assumed that the
Merger will so qualify. We also have assumed that obtaining all regulatory and
other approvals and third party consents required for consummation of the Merger
will not have an adverse impact on the Company or Parent or on the anticipated
benefits of the Merger, and we have assumed that the transactions described in
the Merger Agreement will be consummated without waiver or modification of any
of the material terms or conditions contained therein by any party thereto. Our
opinion is necessarily based on economic and market conditions and other
circumstances as they exist and can be evaluated by us as of the date hereof. We
are not expressing any opinion herein as to the prices at which any securities
of Parent or the Company will actually trade at any time.
 
     In the ordinary course of our business, we may actively trade the debt and
equity securities of the Company and Parent for our own account and for the
accounts of customers and, accordingly, may at any time hold a long or short
position in such securities.
 
     Wasserstein Perella & Co., Inc. ("WP&Co.") has provided investment banking
services to the Company from time to time. WP&Co. advised the Company in the
sale of certain assets of Vanguard Cellular Systems of South Carolina, Inc. and
in the sale of the assets of Western Florida Cellular Telephone Corp. and
related minority-owned cellular interests. WP&Co. will receive customary fees
for such services.
 
     WP&Co. solicited proposals from other parties with respect to the
acquisition of the Company or any of its assets. The Company considered such
proposals and determined that the Merger with the Parent was the best proposal
for the Company.
 
     Our opinion addresses only the fairness from a financial point of view to
the stockholders of the Company (other than the Parent) of the Merger
Consideration, and we do not express any views on any other term of the Merger.
Specifically, our opinion does not address the Company's underlying business
decision to effect the transactions contemplated by the Merger Agreement. In
addition, our opinion does not address the solvency of the Company or the Parent
following consummation of the Merger or at any time.
 
     It is understood that this letter is for the benefit and use of the Board
of Directors of the Company in its consideration of the Merger, and except for
inclusion in its entirety in any registration statement or proxy statement
required to be circulated to stockholders of the Company relating to the Merger,
may not be quoted, referred to or reproduced at any time or in any manner
without our prior written consent. This opinion does not constitute a
recommendation to any stockholder as to how such holder should vote with respect
to the Merger.
 
                                       C-2
<PAGE>   141
 
     Based upon and subject to the foregoing, including the various assumptions
and limitations set forth herein, it is our opinion that as of the date hereof
the Merger Consideration provided for pursuant to the Merger Agreement is fair
to the stockholders of the Company (other than the Parent) from a financial
point of view.
 
                                          Very truly yours,
 
                                          /s/ WASSERSTEIN PERELLA & CO., INC.
                                          --------------------------------------
                                          WASSERSTEIN PERELLA & CO., INC.
 
                                       C-3
<PAGE>   142
 
                                                                      APPENDIX D
 
                    NORTH CAROLINA BUSINESS CORPORATION ACT
 
                                  ARTICLE 13.
 
                               DISSENTERS' RIGHTS
 
PART 1.  RIGHT TO DISSENT AND OBTAIN PAYMENT FOR SHARES
 
     55-13-01  DEFINITIONS. -- In this Article:
 
          (1) "Corporation" means the issuer of the shares held by a dissenter
     before the corporate action, or the surviving or acquiring corporation by
     merger or share exchange of that issuer.
 
          (2) "Dissenter" means a shareholder who is entitled to dissent from
     corporate action under G.S. 55-13-02 and who exercises that right when and
     in the manner required by G.S. 55-13-20 through 55-13-28.
 
          (3) "Fair value", with respect to a dissenter's shares, means the
     value of the shares immediately before the effectuation of the corporate
     action to which the dissenter objects excluding any appreciation or
     depreciation in anticipation of the corporate action unless exclusion would
     be inequitable.
 
          (4) "Interest" means interest from the effective date of the corporate
     action until the date of payment, at a rate that is fair and equitable
     under all the circumstances, giving due consideration to the rate currently
     paid by the corporation on its principal bank loans, if any, but not less
     than the rate provided by G.S. 24-1.
 
          (5) "Record shareholder" means the person in whose name shares are
     registered in the records of a corporation or the beneficial owner of
     shares to the extent of the rights granted by a nominee certificate on file
     with a corporation.
 
          (6) "Beneficial shareholder" means the person who is a beneficial
     owner of shares held in a voting trust or by a nominee as the record
     shareholder.
 
          (7) "Shareholder" means the record shareholder or the beneficial
     shareholder.
 
     55-13-02  RIGHT TO DISSENT. -- (a) In addition to any rights granted under
Article 9, a shareholder is entitled to dissent from, and obtain payment of the
fair value of his shares in the event of, any of the following corporate
actions:
 
          (1) Consummation of a plan of merger to which the corporation (other
     than a parent corporation in a merger under G.S. 55-11-04) is a party
     unless (i) approval by the shareholders of that corporation is not required
     under G.S. 55-11-03(g) or (ii) such shares are then redeemable by the
     corporation at a price not greater than the cash to be received in exchange
     for such shares;
 
          (2) Consummation of a plan of share exchange to which the corporation
     is a party as the corporation whose shares will be acquired, unless such
     shares are then redeemable by the corporation at a price not greater than
     the cash to be received in exchange for such shares;
 
          (3) Consummation of a sale or exchange of all, or substantially all,
     of the property of the corporation other than as permitted by G.S.
     55-12-01, including a sale in dissolution, but not including a sale
     pursuant to court order or a sale pursuant to a plan by which all or
     substantially all of the net proceeds of the sale will be distributed in
     cash to the shareholders within one year after the date of sale;
 
                                       D-1
<PAGE>   143
 
          (4) An amendment of the articles of incorporation that materially and
     adversely affects rights in respect of a dissenter's shares because it (i)
     alters or abolishes a preferential right of the shares; (ii) creates,
     alters, or abolishes a right in respect of redemption, including a
     provision respecting a sinking fund for the redemption or repurchase, of
     the shares; (iii) alters or abolishes a preemptive right of the holder of
     the shares to acquire shares or other securities; (iv) excludes or limits
     the right of the shares to vote on any matter, or to cumulate votes; (v)
     reduces the number of shares owned by the shareholder to a fraction of a
     share if the fractional share so created is to be acquired for cash under
     G.S. 55-6-04; or (vi) changes the corporation into a nonprofit corporation
     or cooperative organization;
 
          (5) Any corporate action taken pursuant to a shareholder vote to the
     extent the articles of incorporation, bylaws, or a resolution of the board
     of directors provides that voting or nonvoting shareholders are entitled to
     dissent and obtain payment for their shares.
 
          (b) A shareholder entitled to dissent and obtain payment for his
     shares under this Article may not challenge the corporate action creating
     his entitlement, including without limitation a merger solely or partly in
     exchange for cash or other property, unless the action is unlawful or
     fraudulent with respect to the shareholder or the corporation.
 
          (c) Notwithstanding any other provision of this Article, there shall
     be no right of dissent in favor of holders of shares of any class or series
     which, at the record date fixed to determine the shareholders entitled to
     receive notice of and to vote at the meeting at which the plan of merger or
     share exchange or the sale or exchange of property is to be acted on, were
     (i) listed on a national securities exchange or (ii) held by at least 2,000
     record shareholders, unless in either case:
 
             (1) The articles of incorporation of the corporation issuing the
        shares provide otherwise;
 
             (2) In the case of a plan of merger or share exchange, the holders
        of the class or series are required under the plan of merger or share
        exchange to accept for the shares anything except;
 
                a. Cash;
 
                b. Shares, or shares and cash in lieu of fractional shares of
           the surviving or acquiring corporation, or of any other corporation
           which, at the record date fixed to determine the shareholders
           entitled to receive notice of and vote at the meeting at which the
           plan of merger or share exchange is to be acted on, were either
           listed subject to notice of issuance on a national securities
           exchange or held of record by at least 2,000 record shareholders; or
 
                c. A combination of cash and shares as set forth in
           sub-subdivisions a. and b. of this subdivision.
 
     55-13-03  DISSENT BY NOMINEES AND BENEFICIAL OWNERS. -- (a) A record
shareholder may assert dissenters' rights as to fewer than all the shares
registered in his name only if he dissents with respect to all shares
beneficially owned by any one person and notifies the corporation in writing of
the name and address of each person on whose behalf he asserts dissenters'
rights. The rights of a partial dissenter under this subsection are determined
as if the shares as to which he dissents and his other shares were registered in
the names of different shareholders.
 
     (b) A beneficial shareholder may assert dissenters' rights as to shares
held on his behalf only if: (1) He submits to the corporation the record
shareholder's written consent to the dissent not later than the time the
beneficial shareholder asserts dissenters' rights; and (2) He does so with
respect to all shares of which he is the beneficial shareholder.
 
                                       D-2
<PAGE>   144
 
PART 2.  PROCEDURE FOR EXERCISE OF DISSENTERS' RIGHTS
 
     55-13-20  NOTICE OF DISSENTERS' RIGHTS. -- (a) If proposed corporate action
creating dissenters' rights under G.S. 55-13-02 is submitted to a vote at a
shareholders' meeting, the meeting notice must state that shareholders are or
may be entitled to assert dissenters' rights under this Article and be
accompanied by a copy of this Article.
 
     (b) If corporate action creating dissenters' rights under G.S. 55-13-02 is
taken without a vote of shareholders, the corporation shall no later than 10
days thereafter notify in writing all shareholders entitled to assert
dissenters' rights that the action was taken and send them the dissenters'
notice described in G.S. 55-13-22.
 
     (c) If a corporation fails to comply with the requirements of this section,
such failure shall not invalidate any corporate action taken; but any
shareholder may recover from the corporation any damage which he suffered from
such failure in a civil action brought in his own name within three years after
the taking of the corporate action creating dissenters' rights under G.S.
55-13-02 unless he voted for such corporate action.
 
     55-13-21 NOTICE OF INTENT TO DEMAND PAYMENT -- (a) If proposed corporate
action creating dissenters' rights under G.S. 55-13-02 is submitted to a vote at
a shareholders' meeting, a shareholder who wishes to assert dissenters' rights:
(1) Must give to the corporation, and the corporation must actually receive,
before the vote is taken written notice of his intent to demand payment for his
shares if the proposed action is effectuated; and (2) Must not vote his shares
in favor of the proposed action.
 
     (b) A shareholder who does not satisfy the requirements of subsection (a)
is not entitled to payment for his shares under this Article.
 
     55-13-22 DISSENTERS' NOTICE -- (a) If proposed corporate action creating
dissenters' rights under G.S. 55-13-02 is authorized at a shareholders' meeting,
the corporation shall mail by registered or certified mail, return receipt
requested, a written dissenters' notice to all shareholders who satisfied the
requirements of G.S. 55-13-21.
 
     (b) The dissenters' notice must be sent no later than 10 days after
shareholder approval, or if no shareholder approval is required, after the
approval of the board of directors, of the corporate action creating dissenters'
rights under G.S. 55-13-02, and must: (1) State where the payment demand must be
sent and where and when certificates for certificated shares must be deposited;
(2) Inform holders of uncertificated shares to what extent transfer of the
shares will be restricted after the payment demand is received; (3) Supply a
form for demanding payment; (4) Set a date by which the corporation must receive
the payment demand, which date may not be fewer than 30 or more than 60 days
after the date the subsection (a) notice is mailed; and (5) Be accompanied by a
copy of this Article.
 
     55-13-23 DUTY TO DEMAND PAYMENT -- (a) A shareholder sent a dissenters'
notice described in G.S. 55-13-22 must demand payment and deposit his share
certificates in accordance with the terms of the notice.
 
     (b) The shareholder who demands payment and deposits his share certificates
under subsection (a) retains all other rights of a shareholder until these
rights are cancelled or modified by the taking of the proposed corporate action.
 
     (c) A shareholder who does not demand payment or deposit his share
certificates where required, each by the date set in the dissenters' notice, is
not entitled to payment for his shares under this Article.
 
                                       D-3
<PAGE>   145
 
     55-13-24 SHARE RESTRICTIONS -- (a) The corporation may restrict the
transfer of uncertificated shares from the date the demand for their payment is
received until the proposed corporate action is taken or the restrictions
released under G.S. 55-13-26.
 
     (b) The person for whom dissenters' rights are asserted as to
uncertificated shares retains all other rights of a shareholder until these
rights are cancelled or modified by the taking of the proposed corporate action.
 
     55-13-25 PAYMENT -- (a) As soon as the proposed corporate action is taken,
or within 30 days after receipt of a payment demand, the corporation shall pay
each dissenter who complied with G.S. 55-13-23 the amount the corporation
estimates to be the fair value of his shares, plus interest accrued to the date
of payment.
 
     (b) the payment shall be accompanied by: (1) The corporation's most recent
available balance sheet as of the end of a fiscal year ending not more than 16
months before the date of payment, an income statement for that year, a
statement of cash flows for that year, and the latest available interim
financial statements, if any; (2) An explanation of how the corporation
estimated the fair value of the shares; (3) An explanation of how the interest
was calculated; (4) A statement of the dissenter's right to demand payment under
G.S. 55-13-28; and (5) A copy of this Article.
 
     55-13-26  FAILURE TO TAKE ACTION. -- (a) If the corporation does not take
the proposed action within 60 days after the date set for demanding payment and
depositing share certificates, the corporation shall return the deposited
certificates and release the transfer restrictions imposed on uncertificated
shares.
 
     (b) If after returning deposited certificates and releasing transfer
restrictions, the corporation takes the proposed action, it must send a new
dissenters' notice under G.S. 55-13-22 and repeat the payment demand procedure.
 
     55-13-28  PROCEDURE IF SHAREHOLDER DISSATISFIED WITH CORPORATION'S PAYMENT
OR FAILURE TO PERFORM. -- (a) A dissenter may notify the corporation in writing
of his own estimate of the fair value of his shares and amount of interest due,
and demand payment of the amount in excess of the payment by the corporation
under G.S. 55-13-25 for the fair value of his shares and interest due, if: (1)
The dissenter believes that the amount paid under G.S. 55-13-25 is less than the
fair value of his shares or that the interest due is incorrectly calculated; (2)
The corporation fails to make payment under G.S. 55-13-25; or (3) The
corporation, having failed to take the proposed action, does not return the
deposited certificates or release the transfer restrictions imposed on
uncertificated shares within 60 days after the date set for demanding payment.
 
     (b) A dissenter waives his right to demand payment under this section
unless he notifies the corporation of his demand in writing (j) under
subdivision (a)(l) within 30 days after the corporation made payment for his
shares of (ii) under subdivisions (a)(2) and (a)(3) within 30 days after the
corporation has failed to perform timely. A dissenter who fails to notify the
corporation of his demand under subsection (a) within such 30-day period shall
be deemed to have withdrawn his dissent and demand for payment.
 
PART 3.  JUDICIAL APPRAISAL OF SHARES
 
     55-13-30  COURT ACTION. -- (a) If a demand for payment under G.S. 55-13-28
remains unsettled, the dissenter may commence a proceeding within 60 days after
the earlier of (i) the date payment is made under G.S. 55-13-25, or (ii) the
date of the dissenter's payment demand under G.S. 55-13-28 by filing a complaint
with the Superior Court Division of the General Court of Justice to determine
the fair value of the shares and accrued interest. A dissenter who takes no
action within the 60-day period shall be deemed to have withdrawn his dissent
and demand for payment.
 
                                       D-4
<PAGE>   146
 
     (c) The court shall have the discretion to make all dissenters (whether or
not residents of this State) whose demands remain unsettled parties to the
proceeding as in an action against their shares and all parties must be served
with a copy of the complaint. Nonresidents may be served by registered or
certified mail or by publication as provided by law.
 
     (d) The jurisdiction of the superior court in which the proceeding is
commenced under subsection (a) is plenary and exclusive. The court may appoint
one or more persons as appraisers to receive evidence and recommend decision on
the question of fair value. The appraisers have the powers described in the
order appointing them, or in any amendment to it. The parties are entitled to
the same discovery rights as parties in other civil proceedings. The proceeding
shall be tried as in other civil actions. However, in a proceeding by a
dissenter in a corporation that was a public corporation immediately prior to
consummation of the corporate action giving rise to the right of dissent under
G.S. 55-13-02, there is no right to a trial by jury.
 
     (e) Each dissenter made a party to the proceeding is entitled to judgment
for the amount, if any, by which the court finds the fair value of his shares,
plus interest, exceeds the amount paid by the corporation.
 
     55-13-31  COURT COSTS AND COUNSEL FEES. -- (a) The court in an appraisal
proceeding commenced under G.S. 55-13-30 shall determine all costs of the
proceeding, including the reasonable compensation and expenses of appraisers
appointed by the court, and shall assess the costs as it finds equitable.
 
     (b) The court may also assess the fees and expenses of counsel and experts
for the respective parties, in amounts the court finds equitable: (1) Against
the corporation and in favor of any or all dissenters if the court finds the
corporation did not substantially comply with the requirements of G.S. 55-13-20
through 55-13-28; or (2) Against either the corporation or a dissenter, in favor
of either or any other party, if the court finds that the party against whom the
fees and expenses are assessed acted arbitrarily, vexatiously, or not in good
faith with respect to the rights provided by this Article.
 
     (c) If the court finds that the services of counsel for any dissenter were
of substantial benefit to other dissenters similarly situated, and that the fees
for those services should not be assessed against the corporation, the court may
award to these counsel reasonable fees to be paid out of the amounts awarded the
dissenters who were benefited.
 
                                       D-5
<PAGE>   147
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     Pursuant to the statutes of the State of New York, a director or officer of
a corporation is entitled, under specified circumstances, to indemnification by
the corporation against reasonable expenses, including attorneys' fees, incurred
by him or her in connection with the defense of a civil or criminal proceeding
to which he or she has been made, or threatened to be made, a party by reason of
the fact that he or she was such a director or officer. In certain
circumstances, indemnity is provided against judgments, fines and amounts paid
in settlement. In general, indemnification is available where the director or
officer acted in good faith, for a purpose such director or officer reasonably
believed to be in the best interests of the corporation. Specific court approval
is required in some cases. The foregoing statement is qualified in its entirety
by reference to Sections 715, 717 and 721 through 725 of the New York Business
Corporation Law ("NYBCL").
 
     The by-laws of the Registrant provide that the Registrant is authorized, by
(i) a resolution of shareholders, (ii) a resolution of directors or (iii) an
agreement providing for such indemnification, to the fullest extent permitted by
applicable law, to provide indemnification and to advance expenses to its
directors and officers in respect of claims, actions, suits, or proceedings
based upon, arising from, relating to, or by reason of the fact that any such
director or officer serves or served in such capacity with the corporation or at
the request of the Registrant in any capacity with any other enterprise.
 
     The Registrant has entered into contracts with its officers and directors,
pursuant to the provisions of NYBCL Section 721, by which it will be obligated
to indemnify such persons, to the fullest extent permitted by the NYBCL, against
expenses, fees, judgments, fines, and amounts paid in settlement in connection
with any present or future threatened, pending or completed action, suit or
proceeding based in any way upon or related to the fact that such person was an
officer or director of the Registrant or, at the request of the Registrant, an
officer, director or other partner, agent, employee, or trustee of another
enterprise. The contractual indemnification so provided will not extend to any
situation where a judgment or other final adjudication adverse to such person
establishes that his acts were committed in bad faith or were the result of
active and deliberate dishonesty or that there inured to such person a financial
profit or other advantage.
 
     The directors and officers of the Registrant are covered by insurance
policies indemnifying them against certain liabilities, including certain
liabilities arising under the Securities Act of 1933, as amended (the
"Securities Act"), which might be incurred by them in such capacities.
 
ITEM 21.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
     (a) The following exhibits are filed herewith or incorporated herein by
reference:
 
<TABLE>
<CAPTION>
EXHIBIT
  NO.
- -------
<C>       <S>
  2.01    Amended and Restated Merger Agreement, dated as of October
          2, 1998, among the Registrant, Winston, Inc. and Vanguard
          Cellular Systems, Inc. ("Vanguard") (the "Merger Agreement")
          (included as Appendix A to the Proxy Statement/Prospectus).
          The Registrant agrees to furnish supplementally a copy of
          any omitted schedule to the Securities and Exchange
          Commission (the "Commission") upon request.
  2.02    Agreement and Plan of Restructuring and Merger among the
          Registrant, Italy Merger Corp. and Tele-Communications,
          Inc., dated as of June 23, 1998 (incorporated by reference
          to Exhibit 2.01 to the Registrant's Registration Statement
          on Form S-4, File No. 333-70279). The Registrant agrees to
          furnish supplementally a copy of any omitted schedule to the
          Commission upon request.
</TABLE>
 
                                      II-1
<PAGE>   148
 
<TABLE>
<CAPTION>
EXHIBIT
  NO.
- -------
<C>       <S>
  4.01    No instrument that defines the rights of holders of
          long-term debt of the Registrant and all of its consolidated
          subsidiaries is filed herewith pursuant to Regulation S-K,
          Item 601(b)(4)(iii)(A). Pursuant to such regulation, the
          Registrant hereby agrees to furnish a copy of any such
          instrument to the Commission upon request.
  5.01    Opinion of Robert S. Feit, Esq., General Attorney and
          Assistant Secretary of the Registrant, as to the legality of
          the securities being registered.
  8.01    Opinion of Wachtell, Lipton, Rosen & Katz as to certain U.S.
          federal income tax matters.*
  8.02    Opinion of Latham & Watkins as to certain U.S. federal
          income tax matters.*
 23.01    Consent of Robert S. Feit, Esq., General Attorney and
          Assistant Secretary of the Registrant (included in Exhibit
          5.01).
 23.02    Consent of Wasserstein Perella & Co., Inc.
 23.03    Consents of PricewaterhouseCoopers LLP.
 23.04    Consent of KPMG LLP.
 23.05    Consent of KPMG LLP.
 23.06    Consent of Arthur Andersen LLP.
 23.07    Consent of Arthur Andersen & Co.
 23.08    Consent of KPMG LLP
 23.09    Consent of Wachtell, Lipton, Rosen & Katz (included in
          Exhibit 8.01).
 23.10    Consent of Latham & Watkins (included in Exhibit 8.02).
 24.01    Powers of attorney.
 99.01    Option Agreement, dated as of October 2, 1998, between the
          Registrant and Vanguard (included as Appendix B to the Proxy
          Statement/Prospectus).
 99.02    Voting Agreements, dated as of October 2, 1998, between the
          Registrant and Haynes G. Griffin, Stephen R. Leeolou, L.
          Richardson Preyer, Jr., Stuart S. Richardson, Piedmont
          Harbor-Piedmont Associates Limited Partnership and the Smith
          Richardson Foundation, Inc. (incorporated by reference to
          Exhibit 3 to the Schedule 13D filed by the Registrant with
          respect to Vanguard on October 2, 1998).
 99.03    Charitable Trust and Family Foundation Voting Agreements,
          dated as of December 22, 1998, between the Registrant and
          The Haynes G. Griffin 1998 Charitable Remainder Unitrust,
          the Griffin Family Foundation, The Stephen R. and Mary D.
          Leeolou 1998 Charitable Remainder Unitrust, the Leeolou
          Family Foundation, the Lunsford Richardson Preyer, Jr.
          Charitable Remainder Unitrust and the Preyer-Jacobs
          Foundation (incorporated by reference to Exhibit 7 to
          Amendment No. 2 to the Schedule 13D filed by the Registrant
          with respect to Vanguard on January 4, 1999).
 99.04    Letter Agreement, dated December 28, 1998, between the
          Registrant and Vanguard regarding the Executive Loan Program
          (incorporated by reference to Exhibit 6 to Amendment No. 2
          to the Schedule 13D filed by the Registrant with respect to
          Vanguard on January 4, 1999).
 99.05    Form of Vanguard Proxy Card.
 99.06    Form of Election and Letter of Transmittal.
</TABLE>
 
- -------------------------
* To be filed by a post-effective amendment upon consummation of the Merger.
 
ITEM 22.  UNDERTAKINGS.
 
     The undersigned Registrant hereby undertakes:
 
     That, for purposes of determining any liability under the Securities Act,
each filing of the Registrant's annual report pursuant to Section 13(a) or
Section 15(d) of the Securities and Exchange Act of 1934, as amended (the
"Exchange Act") (and, where applicable, each filing of an
 
                                      II-2
<PAGE>   149
 
employee benefit plan's annual report pursuant to Section 15(d) of the Exchange
Act) that is incorporated by reference in this Registration Statement shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
 
     That, prior to any public reoffering of the securities registered hereunder
through use of a prospectus that is a part of this Registration Statement by any
person or party who is deemed to be an underwriter within the meaning of Rule
145(c), the issuer undertakes that such reoffering prospectus will contain the
information called for by the applicable registration form with respect to
reofferings by persons who may be deemed underwriters, in addition to the
information called for by the other items of the applicable form.
 
     That every prospectus: (i) that is filed pursuant to the paragraph
immediately preceding, or (ii) that purports to meet the requirements of Section
10(a)(3) of the Securities Act and is used in connection with an offering of
securities subject to Rule 415, will be filed as a part of an amendment to this
Registration Statement and will not be used until such amendment is effective,
and that, for purposes of determining any liability under the Securities Act,
each such post-effective amendment shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such
securities at the time shall be deemed to be the initial bona fide offering
thereof.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that, in the opinion of the Commission, such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the Registrant of expenses incurred or
paid by a director, officer or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.
 
     To respond to requests for information that is incorporated by reference
into the prospectus pursuant to Item 4, 10(b), 11 or 13 of this Form, within one
business day of receipt of such request, and to send the incorporated documents
by first class mail or other equally prompt means. This includes information
contained in documents filed subsequent to the effective date of this
Registration Statement through the date of responding to the request.
 
     To supply, by means of a post-effective amendment, all information
concerning a transaction and the company being acquired involved therein that
was not the subject of and included in this Registration Statement when it
became effective.
 
                                      II-3
<PAGE>   150
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of New York, State of New
York, on March 26, 1999.
 
                                          AT&T CORP.
 
                                          By:     /s/ MARILYN J. WASSER
                                            ------------------------------------
                                                     Marilyn J. Wasser
                                            Vice President -- Law and Secretary
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the date indicated.
 
<TABLE>
<CAPTION>
                      SIGNATURE                                            CAPACITY
                      ---------                                            --------
<C>                                                      <S>
            PRINCIPAL EXECUTIVE OFFICER:
                          *                              Chairman and Chief Executive Officer
- -----------------------------------------------------
                C. Michael Armstrong
 
            PRINCIPAL FINANCIAL OFFICER:
 
                          *                              Senior Executive Vice President and Chief
- -----------------------------------------------------      Financial Officer
                  Daniel E. Somers
 
            PRINCIPAL ACCOUNTING OFFICER:
 
                          *                              Vice President and Controller
- -----------------------------------------------------
                 Nicholas S. Cyprus
 
                          *                              Director
- -----------------------------------------------------
                C. Michael Armstrong
 
                          *                              Director
- -----------------------------------------------------
                   Kenneth T. Derr
 
                          *                              Director
- -----------------------------------------------------
                 M. Kathryn Eickhoff
 
                          *                              Director
- -----------------------------------------------------
                  Walter Y. Elisha
 
                          *                              Director
- -----------------------------------------------------
                 George M.C. Fisher
</TABLE>
 
                                      II-4
<PAGE>   151
 
<TABLE>
<CAPTION>
                      SIGNATURE                                            CAPACITY
                      ---------                                            --------
<C>                                                      <S>
 
                          *                              Director
- -----------------------------------------------------
                   Donald V. Fites
 
                          *                              Director
- -----------------------------------------------------
                   Ralph S. Larsen
 
                          *                              Director
- -----------------------------------------------------
                  Donald F. McHenry
 
                          *                              Director
- -----------------------------------------------------
                  Michael I. Sovern
 
                          *                              Director
- -----------------------------------------------------
                  Sanford I. Weill
 
                          *                              Director
- -----------------------------------------------------
                   Thomas H. Wyman
 
                          *                              Director
- -----------------------------------------------------
                   John D. Zeglis
 
             *By: /s/ MARILYN J. WASSER
  ------------------------------------------------
                  Marilyn J. Wasser
                 (Attorney-in-Fact)
</TABLE>
 
March 26, 1999
 
                                      II-5
<PAGE>   152
 
                                  EXHIBIT LIST
 
<TABLE>
<CAPTION>
EXHIBIT
  NO.
- -------
<C>       <S>
  2.01    Amended and Restated Merger Agreement, dated as of October
          2, 1998, among the Registrant, Winston, Inc. and Vanguard
          Cellular Systems, Inc. ("Vanguard") (the "Merger Agreement")
          (included as Appendix A to the Proxy Statement/Prospectus).
          The Registrant agrees to furnish supplementally a copy of
          any omitted schedule to the Commission upon request.
 
  2.02    Agreement and Plan of Restructuring and Merger among the
          Registrant, Italy Merger Corp. and Tele-Communications,
          Inc., dated as of June 23, 1998 (incorporated by reference
          to Exhibit 2.01 to the Registrant's Registration Statement
          on Form S-4, File No. 333-70279). The Registrant agrees to
          furnish supplementally a copy of any omitted schedule to the
          Commission upon request.
  4.01    No instrument which defines the rights of holders of
          long-term debt, of the Registrant and all of its
          consolidated subsidiaries, is filed herewith pursuant to
          Regulation S-K, Item 601(b)(4)(iii)(A). Pursuant to this
          regulation, the Registrant hereby agrees to furnish a copy
          of any such instrument to the Commission upon request.
  5.01    Opinion of Robert S. Feit, Esq., General Attorney and
          Assistant Secretary of the Registrant, as to the legality of
          the securities being registered.
  8.01    Opinion of Wachtell, Lipton, Rosen & Katz as to certain U.S.
          federal income tax matters.*
  8.02    Opinion of Latham & Watkins as to certain U.S. federal
          income tax matters.*
 23.01    Consent of Robert S. Feit, Esq., General Attorney and
          Assistant Secretary of the Registrant (included in Exhibit
          5.01).
 23.02    Consent of Wasserstein Perella & Co., Inc.
 23.03    Consents of PricewaterhouseCoopers LLP.
 23.04    Consent of KPMG LLP.
 23.05    Consent of KPMG LLP.
 23.06    Consent of Arthur Andersen LLP.
 23.07    Consent of Arthur Andersen & Co.
 23.08    Consent of KPMG LLP
 23.09    Consent of Wachtell, Lipton, Rosen & Katz (included in
          Exhibit 8.01).
 23.10    Consent of Latham & Watkins (included in Exhibit 8.02).
 24.01    Powers of attorney.
 99.01    Option Agreement, dated as of October 2, 1998, between the
          Registrant and Vanguard (included as Appendix B to the Proxy
          Statement/Prospectus).
 99.02    Voting Agreements, dated as of October 2, 1998, between the
          Registrant and Haynes G. Griffin, Stephen R. Leeolou, L.
          Richardson Preyer, Jr., Stuart S. Richardson, Piedmont
          Harbor-Piedmont Associates Limited Partnership and the Smith
          Richardson Foundation, Inc. (incorporated by reference to
          Exhibit 3 to the Schedule 13D filed by the Registrant with
          respect to Vanguard on October 2, 1998).
</TABLE>
 
- ---------------
 
<TABLE>
<C>       <S>
* To be filed by a post-effective amendment upon consummation of the
  Merger.
</TABLE>
<PAGE>   153
 
<TABLE>
<CAPTION>
EXHIBIT
  NO.
- -------
<C>       <S>
 99.03    Charitable Trust and Family Foundation Voting Agreements,
          dated as of December 22, 1998, between the Registrant and
          The Haynes G. Griffin 1998 Charitable Remainder Unitrust,
          the Griffin Family Foundation, The Stephen R. and Mary D.
          Leeolou 1998 Charitable Remainder Unitrust, the Leeolou
          Family Foundation, the Lunsford Richardson Preyer, Jr.
          Charitable Remainder Unitrust and the Preyer-Jacobs
          Foundation (incorporated by reference to Exhibit 7 to
          Amendment No. 2 to the Schedule 13D filed by the Registrant
          with respect to Vanguard on January 4, 1999).
 99.04    Letter Agreement, dated December 28, 1998, between the
          Registrant and Vanguard regarding the Executive Loan Program
          (incorporated by reference to Exhibit 6 to Amendment No. 2
          to the Schedule 13D filed by the Registrant with respect to
          Vanguard on January 4, 1999).
 99.05    Form of Vanguard Proxy Card.
 99.06    Form of Election and Letter of Transmittal.
</TABLE>

<PAGE>   1
 
                                                                    EXHIBIT 5.01
 
                                 March 26, 1999
 
AT&T Corp.
32 Avenue of the Americas
New York, New York 10013
 
Dear Sirs:
 
     With reference to the registration statement on Form S-4 (the "Registration
Statement") that AT&T Corp. (the "Company") proposes to file with the Securities
and Exchange Commission under the Securities Act of 1933, as amended, relating
to the 12,637,514 shares of the Company's common stock, par value $1.00 per
share (the "Common Stock"), to be issued pursuant to the Amended and Restated
Agreement and Plan of Merger, dated as of October 2, 1998, by and among the
Company, Winston, Inc. and Vanguard Cellular Systems, Inc., I am of the opinion
that:
 
     1.  the Company is a duly organized and validly existing corporation under
         the laws of the State of New York;
 
     2.  the issuance of the Common Stock has been duly authorized by
         appropriate corporate action of the Company; and
 
     3.  when the Common Stock has been issued and delivered pursuant to a sale
         in the manner described in the Registration Statement, such Common
         Stock will be validly issued, fully paid and non-assessable.
 
     I hereby consent to the filing of this opinion with the Securities and
Exchange Commission in connection with the filing of the Registration Statement.
I also consent to the making of the statement with respect to me in the related
Proxy Statement/Prospectus under the heading "Legal Opinions."
 
                                          Very truly yours,
 
                                          /s/ ROBERT S. FEIT
                                          --------------------------------------
                                                Robert S. Feit
                                                General Attorney and Assistant
                                                Secretary

<PAGE>   1
 
                                                                   EXHIBIT 23.02
 
     We hereby consent to the inclusion of our opinion letter, dated October 2,
1998, to the Board of Directors of Vanguard Cellular Systems, Inc. as Appendix C
to the Proxy Statement/Prospectus constituting part of this Registration
Statement on Form S-4, and the references to our firm in the Proxy
Statement/Prospectus. In giving this consent, we do not admit that we come
within the category of persons whose consent is required under Section 7 of the
Securities Act of 1933, as amended, or the rules and regulations of the
Securities and Exchange Commission promulgated thereunder.
 
                                          /s/ WASSERSTEIN PERELLA & CO., INC.
                                          Wasserstein Perella & Co., Inc.
 
New York, New York
March 26, 1999

<PAGE>   1
 
                                                                   EXHIBIT 23.03
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
     We consent to the incorporation by reference in the registration statement
of AT&T Corp. (the "Company") on Form S-4 of our reports dated January 26, 1998,
on our audits of the consolidated financial statements and consolidated
financial statement schedule of the Company and its subsidiaries as of December
31, 1997 and 1996, and for the years ended December 31, 1997, 1996 and 1995,
which reports are included in the Company's Current Report on Form 8-K/A, as
amended on January 8, 1999.
 
                                          /s/ PRICEWATERHOUSECOOPERS LLP
                                          PricewaterhouseCoopers LLP
 
PricewaterhouseCoopers LLP
New York, New York
March 26, 1999
<PAGE>   2
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
     We consent to the incorporation by reference in the registration statement
of AT&T Corp. (the "Company") on Form S-4 of our reports dated January 25, 1999
on our audits of the consolidated financial statements and consolidated
financial statement schedule of the Company and its subsidiaries, as of December
31, 1998 and 1997, and for the years ended December 31, 1998, 1997 and 1996,
which reports are included in or incorporated by reference in the Company's
Annual Report on Form 10-K, as amended by a Form 10-K/A filed on March 23, 1999,
and which report is included in the Company's Current Report on Form 8-K filed
on March 9, 1999. We also consent to the reference to our firm under the caption
"Experts" and to all other references to our firm in the registration statement.
 
                                          /s/ PRICEWATERHOUSECOOPERS LLP
                                          PricewaterhouseCoopers LLP
 
PricewaterhouseCoopers LLP
New York, New York
March 26, 1999

<PAGE>   1
 
                                                                   EXHIBIT 23.04
 
                        CONSENT OF INDEPENDENT AUDITORS
 
     We consent to the incorporation by reference in the registration statement
on Form S-4 of AT&T Corp. of our report, dated March 9, 1999, relating to the
consolidated balance sheets of Tele-Communications, Inc. and subsidiaries as of
December 31, 1998 and 1997, and the related consolidated statements of
operations and comprehensive earnings, stockholders' equity, and cash flows for
each of the years in the three-year period ended December 31, 1998, which report
appears in the Current Report on Form 8-K of AT&T Corp., dated March 22, 1999,
and to the reference to our firm under the heading "Experts" in the registration
statement.
 
                                                  /s/ KPMG LLP
                                                  KPMG LLP
 
Denver, Colorado
March 26, 1999

<PAGE>   1
 
                                                                   EXHIBIT 23.05
 
                        CONSENT OF INDEPENDENT AUDITORS
 
     We consent to the incorporation by reference in the registration statement
on Form S-4 of AT&T Corp. of our report, dated March 9, 1999, relating to the
combined balance sheets of Liberty /Ventures Group as of December 31, 1998 and
1997, and the related combined statements of operations and comprehensive
earnings, equity, and cash flows for each of the years in the three-year period
ended December 31, 1998, which report appears in the Current Report on Form 8-K
of AT&T Corp., dated March 22, 1999, and to the reference to our firm under the
heading "Experts" in the registration statement.
 
                                          /s/ KPMG LLP
                                          KPMG LLP
Denver, Colorado
March 26, 1999

<PAGE>   1
 
                                                                   EXHIBIT 23.06
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
by reference in this registration statement of AT&T Corp. of our reports dated
February 18, 1998, March 27, 1998, March 17, 1998, and March 24, 1997, on the
financial statements of Vanguard Cellular Systems, Inc., Eastern North Carolina
Cellular Joint Venture, Inter-Act Systems, Incorporated, and PT Rajasa Hazanah
Perkasa, respectively, included in the Form 10-K of Vanguard Cellular Systems,
Inc. for the year ended December 31, 1997 (as amended) and to all references to
our firm included in this registration statement.
 
                                          /s/ ARTHUR ANDERSEN LLP
                                          Arthur Andersen LLP
 
Greensboro, North Carolina
March 22, 1999

<PAGE>   1
 
                                                                   EXHIBIT 23.07
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
by reference in this registration statement of AT&T Corp. of our report on the
financial statements of Star Digitel Limited, dated April 3, 1998 (except with
respect to the matters discussed in Note 21(c), (d), (e), (f), (g), (h), (i) and
(j), as to which the date is March 22, 1999), included in the Form 10-K of
Vanguard Cellular Systems, Inc. for the year ended December 31, 1997 (as
amended) and to all references to our firm included in this registration
statement.
 
                                          /s/ ARTHUR ANDERSEN & CO.
                                          Arthur Andersen & Co.
 
Hong Kong
March 22, 1999

<PAGE>   1
 
                                                                   EXHIBIT 23.08
 
                        CONSENT OF INDEPENDENT AUDITORS
 
     We consent to incorporation by reference in this registration statement on
Form S-4 of AT&T Corp., dated on or about March 26, 1999, of our report dated
April 10, 1998, relating to the consolidated balance sheets of International
Wireless Communications Holdings, Inc. and subsidiary (the Company) as of
December 31, 1996 and 1997, and the related consolidated statements of
operations, stockholders' equity (deficit), and cash flows for each of the years
in the three-year period ended December 31, 1997, which report appears in the
Form 10-K of Vanguard Cellular Systems, Inc. for the fiscal year ended December
31, 1997, as amended, which is incorporated by reference in this registration
statement on Form S-4 of AT&T Corp., and to the reference to our firm under the
heading "Experts" in the prospectus.
 
     Our report dated April 10, 1998, contains an explanatory paragraph that
states that the Company has suffered recurring losses from operations and has a
net capital deficiency, which raise substantial doubt as to its ability to
continue as a going concern. The consolidated financial statements do not
include any adjustments that might result from the outcome of that uncertainty.
 
                                          /s/ KPMG LLP
                                          KPMG LLP
 
Mountain View, California
March 26, 1999

<PAGE>   1
 
                                                                   EXHIBIT 24.01
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is both a director and an officer of the Company,
as indicated below his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as both a director and an
     officer of the Company, to execute and file such registration statement
     with respect to the above-described common shares, and thereafter to
     execute and file any amended registration statement or statements with
     respect thereto, hereby giving and granting to said attorneys, and each of
     them, full power and authority to do and perform each and every act and
     thing whatsoever requisite and necessary to be done in and about the
     premises, as fully, to all intents and purposes, as he might or could do if
     personally present at the doing thereof, hereby ratifying and confirming
     all that said attorneys may or shall lawfully do, or cause to be done, by
     virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 4th day of January, 1999.
 
                                          /s/ C. MICHAEL ARMSTRONG
                                          --------------------------------------
                                          C. Michael Armstrong
                                          Chairman and Chief Executive Officer
<PAGE>   2
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is an officer of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as an officer of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 28th day of December, 1998.
 
                                          /s/ DANIEL E. SOMERS
                                          --------------------------------------
                                          Daniel E. Somers
                                          Senior Executive Vice President
                                          and Chief Financial Officer
<PAGE>   3
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is an officer of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as an officer of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 30th day of December, 1998.
 
                                          /s/ NICHOLAS S. CYPRUS
                                          --------------------------------------
                                          Nicholas S. Cyprus
                                          Vice President and Controller
<PAGE>   4
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 31st day of December, 1998.
 
                                          /s/ KENNETH T. DERR
                                          --------------------------------------
                                          Kenneth T. Derr
                                          Director
<PAGE>   5
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
her signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for her and in
     her name, place and stead, and in her capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as she might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 31st day of December, 1998.
 
                                          /s/ M. KATHRYN EICKHOFF
                                          --------------------------------------
                                          M. Kathryn Eickhoff
                                          Director
<PAGE>   6
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 30th day of December, 1998.
 
                                          /s/ WALTER Y. ELISHA
                                          --------------------------------------
                                          Walter Y. Elisha
                                          Director
<PAGE>   7
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 29th day of December, 1998.
 
                                          /s/ GEORGE M.C. FISHER
                                          --------------------------------------
                                          George M.C. Fisher
                                          Director
<PAGE>   8
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 31st day of December, 1998.
 
                                          /s/ DONALD V. FITES
                                          --------------------------------------
                                          Donald V. Fites
                                          Director
<PAGE>   9
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of January, 1999.
 
                                          /s/ RALPH S. LARSEN
                                          --------------------------------------
                                          Ralph S. Larsen
                                          Director
<PAGE>   10
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 31st day of December, 1998.
 
                                          /s/ DONALD F. MCHENRY
                                          --------------------------------------
                                          Donald F. McHenry
                                          Director
<PAGE>   11
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 31st day of December, 1998.
 
                                          /s/ MICHAEL I. SOVERN
                                          --------------------------------------
                                          Michael I. Sovern
                                          Director
<PAGE>   12
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 30th day of December, 1998.
 
                                          /s/ SANFORD I. WEILL
                                          --------------------------------------
                                          Sanford I. Weill
                                          Director
<PAGE>   13
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 29th day of December, 1998.
 
                                          /s/ THOMAS H. WYMAN
                                          --------------------------------------
                                          Thomas H. Wyman
                                          Director
<PAGE>   14
 
                               POWER OF ATTORNEY
 
KNOW ALL MEN BY THESE PRESENTS:
 
     WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the
"Company"), proposes to file with the Securities and Exchange Commission, under
the provisions of the Securities Act of 1933, as amended, a registration
statement on Form S-4 with respect to common shares to be issued in connection
with the merger of Vanguard Cellular Systems, Inc. with and into a wholly owned
subsidiary of the Company; and
 
     WHEREAS, the undersigned is a director of the Company, as indicated below
his signature:
 
          WHEREAS, the undersigned hereby constitutes and appoints Daniel E.
     Somers and Marilyn J. Wasser, and each of them, as attorneys for him and in
     his name, place and stead, and in his capacity as a director of the
     Company, to execute and file such registration statement with respect to
     the above-described common shares, and thereafter to execute and file any
     amended registration statement or statements with respect thereto, hereby
     giving and granting to said attorneys, and each of them, full power and
     authority to do and perform each and every act and thing whatsoever
     requisite and necessary to be done in and about the premises, as fully, to
     all intents and purposes, as he might or could do if personally present at
     the doing thereof, hereby ratifying and confirming all that said attorneys
     may or shall lawfully do, or cause to be done, by virtue hereof.
 
     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 1st day of February, 1999.
 
                                          /s/ JOHN D. ZEGLIS
                                          --------------------------------------
                                          John D. Zeglis
                                          Director

<PAGE>   1
                                                                  EXHIBIT 99.05

PROXY



                         VANGUARD CELLULAR SYSTEMS, INC.
                    PROXY FOR SPECIAL MEETING OF SHAREHOLDERS
                            TO BE HELD APRIL 27, 1999
                  SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

The undersigned hereby appoints Stuart S. Richardson, Haynes G. Griffin and
Stephen R. Leeolou, or any of them, proxies with full power of substitution to
vote all shares of Class A Common Stock of Vanguard Cellular Systems, Inc.
("Vanguard") standing in the name of the undersigned at the Special Meeting of
Shareholders of Vanguard to be held on April 27, 1999 at 9:00 a.m. local time,
at the offices of Vanguard, 2002 Pisgah Church Road, Suite 300, Greensboro,
North Carolina 27455-3314, and any adjournment thereof, as follows:

                          [(CONTINUED ON REVERSE SIDE)]



                                                                 SEE REVERSE 
                                                                      SIDE

<PAGE>   2
          PLEASE MARK YOUR
 /X/      VOTES AS IN THIS
          EXAMPLE


     1.   Proposal to approve the Amended and Restated Agreement and Plan of
          Merger dated as of October 2, 1998, by and among Vanguard, AT&T Corp.
          and Winston, Inc., a wholly owned subsidiary of AT&T Corp. (the
          "Merger Agreement"), including the plan of merger that is a part of
          the Merger Agreement, and the merger of Vanguard with and into
          Winston, Inc. contemplated thereby.

                          FOR        AGAINST        ABSTAIN
                          / /          / /           / /


     2.   In their discretion, the proxies are authorized to vote upon such
          other business as may properly come before the meeting.

                         YES             NO
                         / /            / /




               THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER
               DIRECTED HEREIN BY THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION
               IS MADE, THIS PROXY WILL BE VOTED FOR PROPOSAL 1.



SIGNATURE(S) ______________________________________________ DATED _______, 19__

Please sign exactly as name appears hereon. When shares are held by joint
tenants, both should sign. When signing as attorney, as executor, administrator,
trustee or guardian, please give full title as such. If a corporation, please
sign in full corporate name by President or other authorized officer. If a
partnership, please sign in partnership name by authorized person.


<PAGE>   1
 
                                                                   EXHIBIT 99.06
 
                   FORM OF ELECTION AND LETTER OF TRANSMITTAL
 
         TO ACCOMPANY CERTIFICATES REPRESENTING SHARES OF COMMON STOCK,
                           PAR VALUE $0.01 PER SHARE,
 
                                       OF
 
                        VANGUARD CELLULAR SYSTEMS, INC.,
                          A NORTH CAROLINA CORPORATION
                                 ("VANGUARD"),
 
when submitted with an election to receive, per share of common stock of
Vanguard ("Vanguard Share"), (1) $23.00 or (2) 0.59805 shares, par value $1.00
per share ("AT&T Shares"), of AT&T Corp., a New York corporation ("AT&T"),
pursuant to the Amended and Restated Agreement and Plan of Merger (the "Merger
Agreement"), dated as of October 2, 1998, among AT&T, Winston, Inc., a Delaware
corporation and wholly owned subsidiary of AT&T ("Merger Sub"), and Vanguard,
pursuant to which Vanguard will be merged with and into Merger Sub (the
"Merger"). AT&T has declared a three-for-two stock split which will be paid on
April 15, 1999. Pursuant to this stock split, the exchange ratio will be
adjusted from the originally announced 0.3987 AT&T Shares to the 0.59805 AT&T
Shares reflected above.
 
                     The Exchange Agent for the Merger is:
 
                      BOSTON EQUISERVE TRUST COMPANY, N.A.
 
<TABLE>
<S>                             <C>                             <C>
           BY MAIL:                        BY HAND:                  BY OVERNIGHT COURIER:
         P.O. Box 9573          Securities Transfer & Reporting       40 Campanelli Drive
     Boston, MA 02205-9573              Services, Inc.                Braintree, MA 02184
    Attn: Corporate Actions           c/o Equiserve L.P.            Attn: Corporate Actions
                                 100 Williams Street, Galleria
                                      New York, NY 10035
</TABLE>
 
     DELIVERY OF THIS FORM OF ELECTION AND LETTER OF TRANSMITTAL TO AN ADDRESS
OTHER THAN AS SET FORTH ABOVE OR TRANSMISSION OF THIS FORM OF ELECTION AND
LETTER OF TRANSMITTAL VIA A FACSIMILE TO A NUMBER OTHER THAN AS SET FORTH ABOVE
WILL NOT CONSTITUTE A VALID DELIVERY TO THE EXCHANGE AGENT. THIS DOCUMENT SHOULD
BE DELIVERED WITH ANY OTHER DOCUMENTS REQUIRED PURSUANT TO THE TERMS HEREOF IN
THE GREEN ENVELOPE DELIVERED IN CONNECTION HEREWITH.
 
                    THE INFORMATION AGENT FOR THE MERGER IS:
 
                             D.F. KING & CO., INC.
                                77 Water Street
                            New York, New York 10005
                Banks and Brokers Call: (212) 269-5550 (Collect)
                  All Others Call: (800) 735-3568 (Toll-Free)
 
     TO BE EFFECTIVE, THIS FORM OF ELECTION AND LETTER OF TRANSMITTAL, TOGETHER
WITH YOUR SHARE CERTIFICATES (OR A GUARANTEE OF DELIVERY OF SUCH SHARE
CERTIFICATES AS SET FORTH IN GENERAL INSTRUCTION 8), MUST BE RECEIVED BY THE
EXCHANGE AGENT BEFORE THE ELECTION DEADLINE.
 
<TABLE>
<S>                                              <C>                          <C>
- ----------------------------------------------------------------------------------------------------------
                            BOX A: ELECTION AND DESCRIPTION OF VANGUARD SHARES
                     (ATTACH ADDITIONAL SHEETS IF NECESSARY; CHECK ONE ELECTION ONLY)
                      SEE "SPECIAL ELECTION INSTRUCTIONS" AND GENERAL INSTRUCTION 3.
                                               CHOOSE ONE:
       [ ] SHARE ELECTION            [ ] CASH ELECTION            [ ] NON-ELECTION
- ----------------------------------------------------------------------------------------------------------
                                                                                    NUMBER OF SHARES
    NAME AND ADDRESS OF REGISTERED HOLDER(S)                                         REPRESENTED BY
 (PLEASE FILL IN, IF BLANK, EXACTLY AS NAME(S)                                      EACH CERTIFICATE
                     APPEARS                             CERTIFICATE                (OR COVERED BY A
              ON CERTIFICATE(S))*                          NUMBER**              GUARANTEE OF DELIVERY)
- ----------------------------------------------------------------------------------------------------------
 
                                                 ------------------------------------------------------
 
                                                 ------------------------------------------------------
 
                                                 ------------------------------------------------------
 
                                                 ------------------------------------------------------
 
                                                 ------------------------------------------------------
 
                                                 ------------------------------------------------------
                                                    TOTAL NUMBER OF SHARES
- ----------------------------------------------------------------------------------------------------------
</TABLE>
 
*  In the case of a delivery using the Guarantee of Delivery procedures, exactly
   as name(s) will appear on the certificate(s) when delivered.
 
** Certificate numbers are not required if certificates will be delivered using
   the Guarantee of Delivery procedures.
<PAGE>   2
 
         PLEASE READ THE SPECIAL ELECTION INSTRUCTIONS AND THE GENERAL
                INSTRUCTIONS IN THIS FORM OF ELECTION AND LETTER
                   OF TRANSMITTAL CAREFULLY BEFORE COMPLETING
                THIS FORM OF ELECTION AND LETTER OF TRANSMITTAL
 
     THE ELECTION DEADLINE IS 5:00 P.M. (EASTERN TIME) ON APRIL 26, 1999 (AS IT
MAY BE EXTENDED PURSUANT TO THE FOLLOWING SENTENCE, THE "ELECTION DEADLINE"). IF
THE MERGER IS NOT REASONABLY EXPECTED TO OCCUR WITHIN THREE TO FIVE BUSINESS
DAYS AFTER APRIL 27, 1999, AT&T AND VANGUARD WILL AGREE TO A LATER DATE,
REASONABLY EXPECTED TO BE AT LEAST FOUR BUSINESS DAYS PRIOR TO COMPLETION OF THE
MERGER, AS THE ELECTION DEADLINE AND WILL PUBLISH APPROPRIATE ADVANCE NOTICE OF
SUCH ELECTION DEADLINE. A PROPERLY COMPLETED LETTER OF TRANSMITTAL, TOGETHER
WITH YOUR VANGUARD SHARE CERTIFICATES, WILL BE NECESSARY TO RECEIVE YOUR MERGER
CONSIDERATION EVEN AFTER THE ELECTION DEADLINE. MIXED ELECTIONS ARE NOT
PERMITTED. A COMPLETED FORM OF ELECTION AND LETTER OF TRANSMITTAL, TOGETHER WITH
YOUR VANGUARD SHARE CERTIFICATES (AS DEFINED HEREIN) OR A GUARANTEE OF DELIVERY
(AS DEFINED HEREIN), MUST BE RECEIVED BY THE EXCHANGE AGENT PRIOR TO THE
ELECTION DEADLINE IN ORDER FOR ANY CASH ELECTION OR SHARE ELECTION (EACH AS
DEFINED HEREIN) MADE HEREBY TO BE EFFECTIVE. IF A PROPERLY COMPLETED FORM OF
ELECTION AND LETTER OF TRANSMITTAL, TOGETHER WITH YOUR VANGUARD SHARE
CERTIFICATES OR A GUARANTEE OF DELIVERY, IS NOT RECEIVED BY THE EXCHANGE AGENT
PRIOR TO THE ELECTION DEADLINE, YOU WILL BE DEEMED TO HAVE MADE A NON-ELECTION
WITH RESPECT TO YOUR SHARES, AND THE FORM OF MERGER CONSIDERATION (AS DEFINED
HEREIN) WHICH YOU WILL BE ENTITLED TO RECEIVE WILL BE DETERMINED BY THE
PROVISIONS OF THE MERGER AGREEMENT. IF YOU FAIL TO INDICATE A CASH ELECTION OR
SHARE ELECTION IN BOX A ABOVE YOU WILL BE DEEMED TO HAVE INDICATED A
NON-ELECTION. IF YOUR VANGUARD SHARE CERTIFICATES ARE NOT AVAILABLE AT THE TIME
YOU SEND A FORM OF ELECTION AND LETTER OF TRANSMITTAL TO THE EXCHANGE AGENT, YOU
MAY INSTEAD PROVIDE A GUARANTEE OF DELIVERY OF YOUR VANGUARD SHARE CERTIFICATES
AS SET FORTH IN GENERAL INSTRUCTION 8, IN WHICH CASE YOU MUST, WITHIN THREE
TRADING DAYS ON THE NEW YORK STOCK EXCHANGE, INC. ("NYSE") THEREAFTER, DELIVER
TO THE EXCHANGE AGENT THE VANGUARD SHARE CERTIFICATES REPRESENTING THE SHARES IN
RESPECT OF WHICH AN ELECTION IS BEING MADE.
 
     YOUR ELECTION WILL NOT BE VALID IF (A) BEFORE THE SHAREHOLDER VOTE IS TAKEN
ON THE MERGER, VANGUARD RECEIVES WRITTEN NOTICE OF YOUR INTENT TO ASSERT
DISSENTERS' RIGHTS IF THE MERGER TAKES PLACE AND (B) YOU DID NOT VOTE IN FAVOR
OF THE MERGER AND TOOK SUCH OTHER ACTIONS AS MAY BE REQUIRED PRIOR TO THE
EFFECTIVE TIME TO PERFECT DISSENTERS' RIGHTS UNDER LAW.
 
     The Proxy Statement/Prospectus of Vanguard, dated March 26, 1999, relating
to the Merger (the "Proxy Statement/Prospectus") was first mailed to
shareholders of Vanguard on or about March 27, 1999. Copies of the Proxy
Statement/Prospectus, as well as extra copies of this Form of Election and
Letter of Transmittal, may be requested from D.F. King & Co., Inc., the
Information Agent, at the toll-free phone number shown on the cover, or from the
Exchange Agent at the addresses or the toll-free number shown on the cover. The
return of this Form of Election and Letter of Transmittal to the Exchange Agent
is an acknowledgment of the receipt of the Proxy Statement/Prospectus.
 
     If your Vanguard Share Certificate(s) have been lost, stolen or destroyed
and the undersigned requires assistance in replacing them, see General
Instruction 13 below. You cannot submit an effective Form of Election and Letter
of Transmittal without enclosing your Vanguard Share Certificate(s) or a
Guarantee of Delivery with this Form of Election and Letter of Transmittal. If
you submit a Guarantee of Delivery, your Vanguard Share Certificates must be
delivered within three NYSE trading days thereafter. Therefore, if you wish to
make an effective Election, it is critical that you act immediately to obtain
replacement share certificates.
 
     COMPLETING AND RETURNING THIS FORM OF ELECTION AND LETTER OF TRANSMITTAL
DOES NOT HAVE THE EFFECT OF CASTING A VOTE WITH RESPECT TO APPROVAL OF THE
MERGER OR THE MERGER AGREEMENT (INCLUDING THE PLAN OF MERGER THAT IS A PART OF
THE MERGER AGREEMENT) AT THE SPECIAL MEETING (AS DEFINED BELOW). TO VOTE AT THE
SPECIAL MEETING, YOU MUST COMPLETE, SIGN AND RETURN THE WHITE PROXY CARD THAT
ACCOMPANIED THE PROXY STATEMENT/PROSPECTUS AND RETURN IT IN THE WHITE ENVELOPE
DELIVERED THEREWITH, OR YOU MUST ATTEND THE SPECIAL MEETING IN PERSON AND VOTE
YOUR SHARES THEREAT. IF YOU HAVE ANY QUESTIONS CONCERNING THE VOTING OF YOUR
VANGUARD SHARES, PLEASE CALL THE INFORMATION AGENT TOLL-FREE AT (800) 733-3568.
<PAGE>   3
 
Ladies and Gentlemen:
 
     Pursuant to the Merger Agreement and subject to the proration procedures
included therein and described in the Proxy Statement/Prospectus, the
undersigned hereby surrenders to the Boston Equiserve Trust Company, N.A., as
Exchange Agent, certificate(s) representing all of the Vanguard Shares (each
such certificate, a "Vanguard Share Certificate") listed in Box A above and (A)
hereby elects, in the manner indicated in Box A above, to have each Vanguard
Share represented by such Vanguard Share Certificates converted into the right
to receive EITHER (1) $23.00 in cash, without interest (a "Cash Election") OR
(2) 0.59805 AT&T Shares (a "Share Election") (a Cash Election and a Share
Election, together, an "Election"), or (B) hereby states that the undersigned
has no preference as between a Cash Election or a Share Election (a
"Non-Election"). In addition, it is understood that the Exchange Agent will pay
cash in lieu of any fractional AT&T Shares otherwise issuable in connection with
the Merger, as provided in the Merger Agreement. Any cash (excluding cash
received in lieu of fractional shares) and AT&T Shares received by holders of
Vanguard Shares in connection with the Merger is hereinafter referred to as
"Cash Consideration" and "Share Consideration," respectively. The Cash
Consideration, Share Consideration and cash paid in lieu of fractional shares
are collectively referred to as the "Merger Consideration."
 
     The undersigned understands that each Election is subject to certain terms,
conditions and limitations that have been set forth in the Merger Agreement
including, but not limited to, the fact that 50% of the outstanding Vanguard
Shares will be converted into the right to receive cash in the Merger and 50% of
the outstanding Vanguard Shares will be converted into the right to receive AT&T
Shares in the Merger. The following Vanguard Shares will not be converted into
the right to receive Merger Consideration: (1) Vanguard Shares held by
shareholders who have not voted in favor of the Merger and have properly given
written notice of their intent to demand payment for their shares if the Merger
is effectuated in accordance with Article 13 ("Article 13") of the North
Carolina Business Corporation Act and have preserved their right to receive
payment for such shares by taking those actions required by Article 13 within
the time periods stipulated therein and (2) Vanguard Shares held by Vanguard or
any wholly owned subsidiary of Vanguard. THE UNDERSIGNED ACKNOWLEDGES THAT THE
UNDERSIGNED'S ELECTION WILL BE SUBJECT TO PRORATION PURSUANT TO THIS LIMITATION
AND THAT MIXED ELECTIONS ARE NOT PERMITTED. AS A RESULT OF THE PRORATION
PROCESS, THE UNDERSIGNED MAY NOT RECEIVE THE FORM OF CONSIDERATION THAT THE
UNDERSIGNED ELECTS TO RECEIVE, BUT MAY, INSTEAD, RECEIVE A MIXTURE OF AT&T
SHARES AND CASH.
 
     AT&T has declared a three-for-two stock split payable on April 15, 1999, as
a result of which the exchange ratio will be adjusted from the originally
announced 0.3987 AT&T Shares to 0.59805 AT&T Shares, as reflected above. The
undersigned understands that the 0.59805 exchange ratio is a fixed ratio and,
therefore, will not change even if the trading price of an AT&T Share changes.
Therefore, the market value of the total transaction and of the AT&T Shares the
undersigned may receive in the Merger will decrease or increase as the price of
AT&T Shares decreases or increases. Furthermore, if the undersigned fails to
properly return a completed Form of Election and Letter of Transmittal, together
with the undersigned's Vanguard Share Certificates or a Guarantee of Delivery
(and comply with the procedures set forth in General Instruction 8 below), or if
the undersigned chooses Non-Election in Box A above, and the value of 0.3987 (on
a pre-split basis, or 0.59805 on a post-split basis) of an AT&T Share at the
Effective Time of the Merger is more or less than $23.00 (which will occur if
the market value of an AT&T Share is more or less than $57.70 on a pre-split
basis, or $38.47 on a post-split basis), and there is an oversubscription for
the form of consideration having a higher value, the undersigned may receive a
form of payment for the undersigned's Vanguard Shares having a lower value than
the form of consideration elected by those Vanguard shareholders that elected
the form of consideration having the higher value.
 
     The undersigned also understands that the undersigned's election will not
be valid if (a) before the shareholder vote is taken on the Merger, Vanguard
receives written notice of the undersigned's intent to assert dissenters' rights
if the Merger takes place and (b) the undersigned does not vote in favor of the
Merger and take such actions as may be required prior to the Effective Time to
preserve dissenters' rights under law.
<PAGE>   4
 
     If the undersigned is acting in a representative or fiduciary capacity for
a particular beneficial owner, the undersigned hereby certifies that this Form
of Election and Letter of Transmittal covers all of the Vanguard Shares owned by
the undersigned in a representative or fiduciary capacity for such particular
beneficial owner.
 
     The undersigned hereby represents and warrants that the undersigned is as
of the date hereof, and will be as of the Effective Time, the registered holder
of Vanguard Shares represented by the Vanguard Share Certificate(s) surrendered
herewith, with good title to such Vanguard Shares and full power and authority
(1) to sell, assign and transfer such shares, free and clear of all liens,
restrictions, charges and encumbrances, and not subject to any adverse claims,
and (2) to make the Election indicated herein, and (except if the undersigned is
acting in a representative or fiduciary capacity) that the same form of Merger
Consideration has been elected with respect to all Vanguard Shares held by or on
behalf of the undersigned. The undersigned will, upon request, execute any
additional documents necessary or desirable to complete the surrender and
exchange of such Vanguard Shares. The undersigned hereby irrevocably appoints
the Exchange Agent as agent of the undersigned to effect the exchange pursuant
to the Merger Agreement and the instructions hereto. All authority conferred or
agreed to be conferred in this Form of Election and Letter of Transmittal shall
be binding upon the successors, assigns, heirs, executors, administrators and
legal representatives of the undersigned and shall not be affected by, and shall
survive, the death or incapacity of the undersigned.
 
                         SPECIAL ELECTION INSTRUCTIONS
 
     The appropriate box must be checked in Box A above in order to make a Cash
Election or Share Election. The box indicating a Non-Election may be checked by
those wishing to make a Non-Election, but any Form of Election and Letter of
Transmittal received by the Exchange Agent without any checked election box or
with more than one checked election box will be treated as indicating a Non-
Election.
 
     Your choice of Election is as follows:
 
<TABLE>
<CAPTION>
                                                   WHAT YOU WILL RECEIVE
                                                  FOR EACH VANGUARD SHARE,
ELECTION                                            SUBJECT TO PRORATION
- --------                                      --------------------------------
<S>                                           <C>
Cash Election...............................  $23.00 in cash, without interest
Share Election..............................  0.59805 AT&T Shares (This number
                                              has been adjusted to reflect the
                                              three-for-two stock split of
                                              AT&T Shares which will be paid
                                              on April 15, 1999.)
</TABLE>
 
     ALL ELECTIONS ARE SUBJECT TO THE PRORATION PROCEDURES SET FORTH IN THE
MERGER AGREEMENT, A COPY OF WHICH IS ATTACHED TO THE PROXY STATEMENT/PROSPECTUS
AS APPENDIX A. THE PRORATION PROCEDURES ARE DESCRIBED UNDER THE CAPTION "THE
MERGER AGREEMENT -- CONVERSION OF VANGUARD SHARES" IN THE PROXY
STATEMENT/PROSPECTUS AND IN GENERAL INSTRUCTION 4 BELOW. YOU ARE URGED TO READ
THE PROXY STATEMENT/PROSPECTUS IN ITS ENTIRETY BEFORE COMPLETING THIS FORM OF
ELECTION AND LETTER OF TRANSMITTAL.
 
     ALL HOLDERS OF VANGUARD SHARES WISHING TO MAKE AN ELECTION MUST DELIVER TO
THE EXCHANGE AGENT A PROPERLY COMPLETED FORM OF ELECTION AND LETTER OF
TRANSMITTAL PRIOR TO THE ELECTION DEADLINE. A PROPERLY COMPLETED LETTER OF
TRANSMITTAL, TOGETHER WITH YOUR VANGUARD SHARE CERTIFICATES, WILL BE NECESSARY
TO RECEIVE YOUR MERGER CONSIDERATION EVEN AFTER THE ELECTION DEADLINE. ALL
HOLDERS SUBMITTING A FORM OF ELECTION AND LETTER OF TRANSMITTAL THAT IS RECEIVED
BY THE EXCHANGE AGENT AFTER THE ELECTION DEADLINE WILL BE DEEMED TO HAVE MADE A
NON-ELECTION REGARDLESS OF THE ELECTION SPECIFIED ON SUCH FORM; HOWEVER, SUCH
DOCUMENTS WILL BE SUFFICIENT TO RECEIVE THE APPLICABLE MERGER CONSIDERATION.
 
     The Exchange Agent reserves the right to deem that you have made a
Non-Election if:
 
          A.  No Election choice is indicated in Box A above;
 
          B.  More than one Election choice is indicated in Box A above;
 
          C.  You fail to follow the instructions on this Form of Election and
     Letter of Transmittal (including failure to submit your Vanguard Share
     Certificate(s) or a Guarantee of Delivery) or otherwise fail to properly
     make an Election;
<PAGE>   5
 
          D.  A COMPLETED FORM OF ELECTION and Letter of Transmittal (including
     submission of your Vanguard Share Certificate(s) or a Guarantee of
     Delivery) is not actually received by the Exchange Agent prior to the
     Election Deadline; or
 
          E.  You return this Form of Election and Letter of Transmittal with a
     Guarantee of Delivery but do not deliver the Vanguard Share Certificates
     representing the shares in respect of which an Election is being made
     within three NYSE trading days thereafter.
 
     Notwithstanding anything to the contrary in this Form of Election and
Letter of Transmittal, the Exchange Agent reserves the right to waive any flaws
in a completed Form of Election and Letter of Transmittal but shall be under no
obligation to do so.
 
     In order to receive the applicable Merger Consideration, this Form of
Election and Letter of Transmittal must be (1) completed and signed in the space
provided below and on the Substitute Form W-9 and (2) mailed or delivered with
your Vanguard Share Certificate(s) or a Guarantee of Delivery to the Exchange
Agent at either of the addresses set forth above. In order to properly make an
Election, these actions must be taken in a timely fashion such that the Form of
Election and Letter of Transmittal and other required documents are received by
the Exchange Agent prior to the Election Deadline.
 
     The effectiveness of Elections received on the Election Deadline and
accompanied by a Guarantee of Delivery will not be finally determined until four
NYSE trading days after the Election Deadline. As a result, the Merger
Consideration to which a holder of Vanguard Shares is entitled (and whether any
proration is necessary) may be delayed for up to three NYSE trading days. The
Merger Consideration is expected to be mailed promptly following such
determination or, if later, promptly after the Merger is consummated. Vanguard
intends to issue a press release announcing the results of the elections and
proration, if any, promptly after the final determination thereof.
 
     Unless otherwise indicated below under "Special Issuance and Payment
Instructions," in exchange for the enclosed Vanguard Share Certificates, the
applicable Merger Consideration will be issued in the name of the undersigned.
Similarly, unless otherwise indicated below under "Special Delivery
Instructions," the applicable Merger Consideration will be mailed to the
undersigned at the address shown in Box A above. In the event that the "Special
Issuance and Payment Instructions" is completed, the applicable Merger
Consideration will be issued in the name of, and will be mailed to, the person
or entity so indicated at the address so indicated, but only after the Exchange
Agent has been provided with satisfactory evidence of the payment of, or
exemption from payment of, any applicable share transfer taxes payable on
account of the transfer to such person or entity prior to the delivery of the
applicable Merger Consideration. In addition, appropriate signature guarantees
must be included with respect to Vanguard Shares for which Special Issuance and
Payment Instructions are given.
<PAGE>   6
 
<TABLE>
<S>                                                         <C>
- -----------------------------------------------------       -----------------------------------------------------
 
 SPECIAL ISSUANCE AND                                        SPECIAL DELIVERY INSTRUCTIONS
 PAYMENT INSTRUCTIONS                                        (SEE GENERAL INSTRUCTION 12)
 (SEE GENERAL INSTRUCTIONS 7 AND 12)
                                                                  To be completed ONLY if the Merger
      To be completed ONLY if the Merger                     Consideration (whether cash or AT&T Shares) is to be
 Consideration (whether cash or AT&T Shares) is to be        mailed to the undersigned at an address other than
 issued in the name of, and mailed to, someone other         that shown in Box A above.
 than the undersigned.
                                                             Mail the Merger Consideration (whether cash or AT&T
 Issue the Merger Consideration (whether cash or AT&T        Shares) to:
 Shares) to:
                                                             Name ----------------------------------------------
 Name ----------------------------------------------         (PLEASE PRINT)
 (PLEASE PRINT)
 Address -------------------------------------------        Address ---------------------------------------------

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

 ---------------------------------------------------        -----------------------------------------------------
 (INCLUDE ZIP CODE)                                          (INCLUDE ZIP CODE)

      If you complete this box, you will need a
 signature guarantee by an eligible institution. See              Check this box if this is a permanent change of
 General Instruction 7.                                      address.  [ ]
- -----------------------------------------------------       -----------------------------------------------------
</TABLE>
<PAGE>   7
 
- --------------------------------------------------------------------------------
 
                                PLEASE SIGN HERE
 
   Signature:
   --------------------------------------------------------------------------
 
   Signature:
   --------------------------------------------------------------------------
 
   Dated:
   ------------------------------------------------------
 
   Name(s):
   --------------------------------------------------------------------------
                                 (PLEASE PRINT)
 
   Capacity:
   --------------------------------------------------------------------------
 
   Daytime Area Code and
   Telephone Number:
   --------------------------------------------------------------------------
 
        Signature(s) of registered holder(s) must be EXACTLY as name(s)
   appear(s) in Box A headed "Election and Description of Vanguard Shares" or
   on the assignment authorizing transfer.
 
        If signed by a trustee, executor, administrator, guardian,
   attorney-in-fact, officer of a corporation or other person acting in a
   fiduciary or representative capacity, the capacity of the person signing
   should be indicated. (See General Instruction 9 hereto.)
 
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
                              SIGNATURE GUARANTEE
          (REQUIRED ONLY IN CASES SPECIFIED IN GENERAL INSTRUCTION 7)
 
        The undersigned hereby guarantees the signature(s) which appear(s) on
   this Form of Election and Letter of Transmittal.
 
   Dated:
   ------------------------------------------------------
 
   --------------------------------------------------------------------------
                (NAME OF ELIGIBLE INSTITUTION ISSUING GUARANTEE)
 
                                 (PLEASE PRINT)
 
   --------------------------------------------------------------------------
                          (FIX MEDALLION STAMP ABOVE)
 
- --------------------------------------------------------------------------------
<PAGE>   8
 
                             GUARANTEE OF DELIVERY
               (TO BE USED IF VANGUARD SHARE CERTIFICATES ARE NOT
                             SURRENDERED HEREWITH)
                          (See General Instruction 8)
 
     THE UNDERSIGNED (CHECK APPROPRIATE BOX BELOW) GUARANTEES TO DELIVER TO THE
EXCHANGE AGENT AT THE APPROPRIATE ADDRESS SET FORTH ABOVE THE CERTIFICATES FOR
VANGUARD SHARES COVERED BY THIS FORM OF ELECTION AND LETTER OF TRANSMITTAL NO
LATER THAN 5:00 P.M., (EASTERN TIME), ON THE THIRD NYSE TRADING DAY AFTER THE
DATE OF EXECUTION OF THIS GUARANTEE OF DELIVERY.
 
<TABLE>
<S>    <C>                                   <C>
[ ]    A member of a registered national
       securities exchange                   -----------------------------------------------------
                                                          Firm (Please Print or Type)
[ ]    A member of the National Association
                                             -----------------------------------------------------
       of Securities Dealers, Inc.                           Authorized Signature
 
                                             -----------------------------------------------------
[ ]    A commercial bank or trust company
       in the United States
                                             -----------------------------------------------------

 
       Dated: ---------------------------    -----------------------------------------------------
                                                                    Address

                                             -----------------------------------------------------
                                                        Area Code and Telephone Number
FACSIMILE TRANSMISSION:
  (for Eligible Institutions only)
  (781) 575-2233
  FOR CONFIRMATION TELEPHONE:
  (800) 733-5001
</TABLE>
<PAGE>   9
 
                              GENERAL INSTRUCTIONS
 
     This Form of Election and Letter of Transmittal is to be completed and
submitted to the Exchange Agent prior to the Election Deadline by those holders
of Vanguard Shares desiring to make a Cash Election or Share Election. It may
also be used as a letter of transmittal for holders of Vanguard Shares who do
not complete and submit the Form of Election and Letter of Transmittal prior to
the Election Deadline or at any time by any holders of Vanguard Shares who wish
to make a Non-Election. Until a record holder's Vanguard Share Certificates are
received by the Exchange Agent at one of the addresses set forth on the cover,
together with such documents as the Exchange Agent may require, and until the
same are processed for exchange by the Exchange Agent, such holders will not
receive any certificates representing Share Consideration or the check for Cash
Consideration or cash in lieu of fractional shares (if any) in exchange for
their Vanguard Share Certificates. THE GREEN RETURN ENVELOPE ADDRESSED TO THE
EXCHANGE AGENT DELIVERED WITH THIS GREEN FORM OF ELECTION AND LETTER OF
TRANSMITTAL SHOULD BE USED TO RETURN THIS GREEN FORM OF ELECTION AND LETTER OF
TRANSMITTAL. YOU SHOULD NOT USE THE WHITE ENVELOPE THAT HAS BEEN SENT IN
CONNECTION WITH THE SOLICITATION OF WHITE PROXY CARDS FOR RETURN OF THE GREEN
FORM OF ELECTION AND LETTER OF TRANSMITTAL. No interest will accrue on the Cash
Consideration or any cash in lieu of fractional shares. Holders of Vanguard
Shares receiving Share Consideration will be entitled to any dividends or other
distributions paid on AT&T Shares after the Effective Time. If your share
certificate(s) are lost, stolen or destroyed, please refer to General
Instruction 13 below.
 
     A HOLDER OF VANGUARD SHARES MUST CHECK THE APPROPRIATE ELECTION BOX IN BOX
A ABOVE TO MAKE A CASH ELECTION OR SHARE ELECTION. ONLY ONE ELECTION BOX MAY BE
CHECKED.
 
     Your election is subject to certain terms, conditions and limitations which
are set forth in the Merger Agreement and described in the Proxy
Statement/Prospectus. The Merger Agreement is included as Appendix A to the
Proxy Statement/Prospectus. Copies of the Proxy Statement/Prospectus may be
requested from the Information Agent or from the Exchange Agent at the addresses
or toll-free numbers shown on the cover. The delivery of this Form of Election
and Letter of Transmittal to the Exchange Agent is an acknowledgment of the
receipt of the Proxy Statement/Prospectus.
 
     1.  Election Deadline.  THE ELECTION DEADLINE IS 5:00 P.M. (EASTERN TIME)
ON APRIL 26, 1999, THE LAST BUSINESS DAY PRIOR TO THE DATE OF THE SPECIAL
MEETING OF SHAREHOLDERS OF VANGUARD CALLED TO APPROVE THE MERGER (THE "SPECIAL
MEETING"). IF THE COMPLETION OF THE MERGER IS NOT REASONABLY EXPECTED TO OCCUR
WITHIN THREE TO FIVE BUSINESS DAYS AFTER APRIL 27, 1999, AT&T AND VANGUARD WILL
AGREE TO A LATER DATE, REASONABLY EXPECTED TO BE AT LEAST FOUR BUSINESS DAYS
PRIOR TO THE COMPLETION OF THE MERGER, AS THE ELECTION DEADLINE AND WILL PUBLISH
APPROPRIATE ADVANCE NOTICE OF SUCH ELECTION DEADLINE. For any Cash Election or
Share Election contained herein to be effective, this Form of Election and
Letter of Transmittal, properly completed, and the related Vanguard Share
Certificate(s) (or a Guarantee of Delivery) must be received by the Exchange
Agent at one of the addresses shown above on this Form of Election and Letter of
Transmittal at or prior to the Election Deadline. ANY VANGUARD SHARE
CERTIFICATES FOR WHICH A GUARANTEE OF DELIVERY IS PROVIDED MUST IN FACT BE
DELIVERED WITHIN THREE NYSE TRADING DAYS AFTER THE DATE SUCH GUARANTEE OF
DELIVERY IS EXECUTED OR A NON-ELECTION WILL BE DEEMED TO HAVE BEEN MADE BY THE
VANGUARD SHARES COVERED THEREBY. The Exchange Agent will determine whether any
Form of Election and Letter of Transmittal or any Vanguard Share Certificates in
respect of a Guarantee of Delivery are received on a timely basis. Any such
determinations made in good faith shall be conclusive and binding.
 
     2.  Effect of Asserting Dissenters' Rights.  A Form of Election will not be
valid and will be ignored if completed by a shareholder that provides Vanguard
(and Vanguard actually receives) written notice of intent to assert dissenters'
rights and does not vote in favor of the Merger and takes such other actions as
may be required prior to the Effective Time to perfect dissenters' rights under
law. Any such shareholder that subsequently fails to perfect dissenters' rights
will receive the form of consideration receivable by shareholders making a
Non-Election.
<PAGE>   10
 
     3.  Revocation or Change of Form of Election and Letter of Transmittal.  A
Form of Election and Letter of Transmittal may be revoked if the Exchange Agent
receives written notice prior to the Election Deadline from the record holder of
the shares covered by such Election who signed the related Form of Election and
Letter of Transmittal. Any person who has effectively revoked a Form of Election
and Letter of Transmittal may, by signed and written notice to the Exchange
Agent, request the return of the Vanguard Share Certificates submitted to the
Exchange Agent and such Vanguard Share Certificates will be returned without
charge to such person promptly after receipt of such request. A Form of Election
and Letter of Transmittal may be changed if the record holder effectively
revokes such holder's Form of Election and Letter of Transmittal in accordance
with the procedures described herein and a new Form of Election and Letter of
Transmittal and the related Vanguard Share Certificate(s) (or a Guarantee of
Delivery) for such record holder is received by the Exchange Agent at or prior
to the Election Deadline. Vanguard shareholders who do wish to revoke and
resubmit should take into account the time required to receive returned
Certificates and resubmit Certificates, which may or may not be possible by the
applicable deadline.
 
     4.  Election Procedures/Proration.  To properly complete Box A, (1) the
undersigned must check either the Cash Election, Share Election or Non-Election
boxes (if no box is checked, the Non-Election box will be deemed to have been
checked); (2) the name and address of the registered holder(s) must be set forth
in the column under the heading "Name and Address of Registered Holder(s)" and
(3) either (a) the number of each Vanguard Share Certificate surrendered
herewith must be written in the column under the heading "Certificate Number" or
(b) if the Guarantee of Delivery procedures are used, the number of shares
represented by the Vanguard Share Certificates to be delivered pursuant to such
procedures must be written in the column under the heading "Number of Shares
Represented by each Certificate," but no certificate number is required. As set
forth in the Proxy Statement/Prospectus, 50% of the outstanding Vanguard Shares
(other than Dissenting Shares and Vanguard-held Shares) will be exchanged for
cash and 50% of such outstanding Vanguard Shares will be exchanged for AT&T
Shares. If the Elections result in an oversubscription of either the Cash
Consideration or the Share Consideration, the procedures for allocating the
Merger Consideration set forth in the Merger Agreement and described in the
Proxy Statement/Prospectus will be followed by the Exchange Agent. Accordingly,
there can be no assurance that a Cash Election or Share Election made by you
will result in your receipt of the desired type and amount of Merger
Consideration. See the Proxy Statement/ Prospectus under the caption "The Merger
Agreement -- Conversion of Vanguard Shares." Mixed elections are not permitted.
The effectiveness of Elections that are accompanied by Guarantees of Delivery
may not be finally determined until four NYSE trading days after the Election
Deadline. The Merger Consideration is expected to be mailed promptly after the
determination of any proration in the Merger. Such determination will occur
immediately prior to the Merger.
 
     5.  Termination of Merger Agreement.  Consummation of the Merger is subject
to the required approval of the shareholders of Vanguard and to the satisfaction
of certain other conditions. No payments related to any surrender of Vanguard
Share Certificates will be made prior to the consummation of the Merger, and no
payments will be made if the Merger Agreement is terminated. If the Merger
Agreement is terminated, all Elections will be void and of no effect and the
Exchange Agent will promptly return all Vanguard Share Certificates previously
received by it. In such event, Vanguard Shares held through The Depository Trust
Company are expected to be available for sale or transfer promptly following
such termination. Certificates representing Vanguard Shares held of record
directly by the beneficial owners of such Vanguard Shares will be returned by
the Exchange Agent without charge to the holder as promptly as practicable by
first class, insured mail.
 
     6.  No Fractional Interests.  No certificate representing a fraction of an
AT&T Share will be issued. In lieu thereof, the Exchange Agent will remit on
AT&T's behalf cash, without interest, in an amount equal to such fractional part
of an AT&T Share multiplied by $23.00. No such holder of Vanguard Shares shall
be entitled to dividends, voting rights or any other rights in respect of any
fractional share.
<PAGE>   11
 
     7.  Guarantee of Signatures.  If the Merger Consideration is to be issued
in the name of the registered holder(s) as inscribed on the surrendered Vanguard
Share Certificate(s), the signatures on this Form of Election and Letter of
Transmittal need not be guaranteed. If the "Special Issuance and Payment
Instructions" box has been completed so that payment is to be made to someone
other than the registered holder(s) of Vanguard Shares with respect to the
surrendered Vanguard Share Certificate(s), signatures on this Form of Election
and Letter of Transmittal must be guaranteed by a financial institution
(including most commercial banks, savings and loan associations and brokerage
houses) that is a participant in the Security Transfer Agent's Medallion
Program, the New York Share Exchange Medallion Program or the Share Exchange
Medallion Program. Public notaries cannot execute acceptable guarantees of
signatures.
 
     8.  Delivery of Form of Election and Letter of Transmittal and Vanguard
Share Certificates; Guarantee of Delivery.  This Form of Election and Letter of
Transmittal, properly completed and duly executed, together with your Vanguard
Share Certificate(s) or a Guarantee of Delivery, should be delivered to the
Exchange Agent at the address set forth above. All Vanguard Share Certificates
held by a single shareholder and not by a nominee, trustee or other
representative (as set forth in General Instruction 9) must all be on a single
Letter of Transmittal and only one Election may be made with respect to such
Vanguard Share Certificates. A Guarantee of Delivery of such Vanguard Share
Certificates must be made by a firm which is a member of a registered national
securities exchange or of the National Association of Securities Dealers, Inc.
or a commercial bank or trust company having an office or correspondent in the
United States, and ANY VANGUARD SHARE CERTIFICATES COVERED BY A GUARANTEE OF
DELIVERY MUST IN FACT BE DELIVERED TO THE EXCHANGE AGENT WITHIN THREE NYSE
TRADING DAYS AFTER THE DATE OF EXECUTION OF SUCH GUARANTEE OF DELIVERY. Failure
to deliver such Vanguard Share Certificates shall invalidate any Election, and a
Non-Election shall be deemed to have been made by the Vanguard Shares covered
thereby. THE METHOD OF DELIVERY OF THE FORM OF ELECTION AND LETTER OF
TRANSMITTAL, THE VANGUARD SHARE CERTIFICATES AND ALL OTHER REQUIRED DOCUMENTS IS
AT THE ELECTION AND RISK OF THE HOLDER OF VANGUARD SHARES. IF YOU CHOOSE TO SEND
THE MATERIALS BY MAIL, IT IS RECOMMENDED THAT THEY BE SENT BY REGISTERED MAIL,
APPROPRIATELY INSURED, WITH RETURN RECEIPT REQUESTED. Delivery of the materials
will be deemed effective, and risk of loss with respect thereto will pass, only
when such materials are actually received by the Exchange Agent.
 
     9.  Shares Held by Nominees, Trustees or other Representatives; Multiple
Elections; Non-Elections. Holders of record of Vanguard Shares who hold such
shares as nominees, trustees or in other representative or fiduciary capacities
(a "Representative") may submit one or more Forms of Election and Letter of
Transmittal covering the aggregate number of Vanguard Shares held by such
Representative for the beneficial owners for whom the Representative is making
an Election or a Non-Election, provided that such Representative certifies that
each Form of Election and Letter of Transmittal covers all of the Vanguard
Shares held by such Representative for any single beneficial owner. Any
Representative that makes an Election or a Non-Election may be required to
provide the Exchange Agent with such documents and/or additional certifications,
if requested, in order to satisfy the Exchange Agent that such Representative
holds such Vanguard Shares for a particular beneficial owner. If any Vanguard
Shares are not covered by an effective Form of Election and Letter of
Transmittal, they will be deemed to be covered by a Non-Election. A holder of
Vanguard Shares must elect to receive the same form of Merger Consideration in
respect of all Vanguard Shares held by or on behalf of such holder. Any person
or entity who beneficially owns Vanguard Shares must instruct the
Representatives that hold Vanguard Shares held on behalf of such person or
entity to elect the same form of Merger Consideration for all Vanguard Shares
held on behalf of such person or entity.
 
     10.  Inadequate Space.  If the space provided herein is inadequate, the
share certificate numbers and the numbers of Vanguard Shares represented thereby
should be listed on additional sheets and attached hereto.
<PAGE>   12
 
     11.  Signatures on Form of Election and Letter of Transmittal, Share Powers
and Endorsements.
 
          (a) All signatures must correspond exactly with the name written on
     the face of the Vanguard Share Certificate(s) without alteration, variation
     or any change whatsoever.
 
          (b) If the Vanguard Share Certificates surrendered are held of record
     by two or more joint owners, all such owners must sign this Form of
     Election and Letter of Transmittal.
 
          (c) If any surrendered Vanguard Shares are registered in different
     names on several Vanguard Share Certificate(s), it will be necessary to
     complete, sign and submit as many separate Forms of Election and Letter of
     Transmittal as there are different registrations of Vanguard Share
     Certificates.
 
          (d) If this Form of Election and Letter of Transmittal is signed by a
     person(s) other than the record holder(s) of the Vanguard Share
     Certificate(s) listed (other than as set forth in paragraph (e) below),
     such certificates must be endorsed or accompanied by appropriate share
     powers, in either case signed exactly as the name(s) of the record
     holder(s) appears on such certificate(s).
 
          (e) If this Form of Election and Letter of Transmittal is signed by a
     trustee, executor, administrator, guardian, attorney-in-fact, officer of a
     corporation or other person acting in a fiduciary or representative
     capacity and such person is not the record holder of the accompanying
     Vanguard Share Certificates, he or she must indicate the capacity when
     signing and must submit proper evidence of his or her authority to act.
 
     12.  Special Issuance and Delivery Instructions.  In the "Special Issuance
and Payment Instructions" box, indicate the name and/or address of the person(s)
to whom the Merger Consideration is to be issued and mailed only if the Merger
Consideration (whether cash or AT&T Shares) is to be issued in the name of
someone other than the person(s) signing this Form of Election and Letter of
Transmittal. If the "Special Issuance and Payment Instructions" box is
completed, the Exchange Agent will issue the Merger Consideration in the name
of, and will mail the Merger Consideration to, the person or entity so indicated
at the address so indicated, but only after the Exchange Agent has been provided
with satisfactory evidence of the payment of, or exemption from payment of, any
applicable share transfer taxes payable on account of the transfer to such
person or entity prior to the delivery of the Merger Consideration.
 
     In the "Special Delivery Instructions" box, indicate the address to which
the Merger Consideration is to be mailed in the name of the undersigned only if
different from the address set forth in Box A.
 
     13.  Lost, Stolen or Destroyed Certificates.  You cannot submit an
effective Form of Election and Letter of Transmittal without enclosing your
Vanguard Share Certificates with this Form of Election and Letter of Transmittal
or providing a Guarantee of Delivery followed within three NYSE trading days
thereafter by the Vanguard Share Certificates. If your Vanguard Share
Certificate(s) have been lost, stolen or destroyed, you are urged to call
American Stock Transfer & Trust Company, Vanguard's transfer agent (the
"Transfer Agent"), at (718) 921-8200. The Transfer Agent will forward additional
documentation which you must complete in order to obtain a replacement share
certificate. You may be required to post an indemnity bond if so required by
Vanguard or AT&T.
 
     14.  Miscellaneous.  AT&T and the Exchange Agent have the discretion to
determine whether a Form of Election and Letter of Transmittal has been properly
completed, signed and submitted or revoked and to disregard immaterial defects
in any Form of Election and Letter of Transmittal. The good faith decision of
AT&T or the Exchange Agent in such matters shall be conclusive and binding. AT&T
and the Exchange Agent are not under any duty to give notification of defects in
any Form of Election and Letter of Transmittal.
<PAGE>   13
 
     15.  Information and Additional Copies.  Information and additional copies
of this Form of Election and Letter of Transmittal may be obtained from the
Information Agent by telephoning toll-free at (800) 733-3568 or from the
Exchange Agent by telephoning toll-free at (800) 733-5001.
 
                           IMPORTANT TAX INFORMATION
 
     Under federal income tax law, the Exchange Agent is required to file a
report with the Internal Revenue Service ("IRS") disclosing any payments made to
a holder of Vanguard Shares pursuant to the Merger Agreement and to impose 31%
backup withholding if required. If the correct certifications on Substitute Form
W-9 are not provided, a $50 penalty may be imposed on the holder by the IRS and
payments made for Vanguard Shares may be subject to backup withholding of 31%.
Backup withholding is also required if the IRS notifies the recipient that the
recipient is subject to backup withholding as a result of a failure to report
all interest and dividends.
 
     In order to avoid backup withholding resulting from a failure to provide a
correct certification, a holder of Vanguard Shares must, unless an exemption
applies, provide the Exchange Agent with his correct taxpayer identification
number ("TIN") on Substitute Form W-9 as set forth on this Form of Election and
Letter of Transmittal. Such person must certify under penalties of perjury that
such number is correct and that such holder is not otherwise subject to backup
withholding. The TIN that must be provided is that of the holder of the Vanguard
Shares. If the Vanguard Shares are held in more than one name or are not
registered in the name of the actual holder or if the Merger Consideration is to
be delivered to another person as provided in the box entitled "Special Issuance
and Payment Instructions", consult the enclosed Guidelines for Certification of
Taxpayer Identification Number on Substitute Form W-9 and your tax advisor for
additional guidance on which number to report. The box in Part 3 of the
Substitute Form W-9 should be checked if the surrendering holder of Vanguard
Shares has not been issued a TIN and has applied for a TIN or intends to apply
for a TIN in the near future. If the box in Part 3 is checked and the Exchange
Agent is not provided with a TIN, AT&T and the Exchange Agent will withhold 31%
of all such payments made for Vanguard Shares and all payments of dividends. A
foreign person may qualify as an exempt recipient by submitting to the Exchange
Agent a properly completed IRS Form W-8, signed under penalties of perjury,
attesting to that person's exempt status. Foreign investors should consult their
tax advisors regarding the need to complete IRS Form W-8 and any other forms
that may be required.
 
     Backup withholding is not an additional federal income tax. Rather, the
federal income tax liability of a person subject to backup withholding will be
reduced by the amount of tax withheld. If backup withholding results in an
overpayment of taxes, a refund may be obtained from the IRS.
 
     Please read the enclosed Guidelines for Certification of Taxpayer
Identification Number on Substitute Form W-9 for additional important
information on how to complete the Substitute Form W-9.
 
     For a summary of the federal income tax consequences of the receipt of the
Merger Consideration, see "The Merger -- Certain Federal Income Tax Consequences
of the Merger" in the Proxy Statement/ Prospectus.
<PAGE>   14
 
<TABLE>
<S>                                <C>                                              <C>
- -------------------------------------------------------------------------------------------------------------------
 PAYER'S NAME: THE BANK OF NEW YORK
- -------------------------------------------------------------------------------------------------------------------
SUBSTITUTE                          Part 1--PLEASE PROVIDE YOUR TAXPAYER              ---------------------------
FORM W-9                            IDENTIFICATION NUMBER IN THE BOX AT RIGHT AND    Social Security Number(s) or
PLEASE FILL IN YOUR                 CERTIFY BY SIGNING AND DATING BELOW.                Employer Identification
NAME AND ADDRESS BELOW                                                                         Number(s)
                                   -------------------------------------------------------------------------------
                                    Part 2--Exempt Payees [ ]
                                   -------------------------------------------------------------------------------
                                    Part 3--Awaiting TIN [ ]
                                   -------------------------------------------------------------------------------
 
- ------------------------------      CERTIFICATION--UNDER PENALTY OF PERJURY, I CERTIFY THAT:
Name (if joint ownership, list      (1) The number shown on this form is my correct Taxpayer Identification Number
first and                               (or I am waiting for a number to be issued to me), and
circle the name of the person or    (2) I am not subject to backup withholding because: (a) I am exempt from backup
entity                                  withholding, or (b) I have not been notified by the Internal Revenue
whose number is entered in Part 1)      Service ("IRS") that I am subject to backup withholding as a result of a
- -------------------------------         failure to report all interest or dividends, or (c) the IRS has notified me
Address (number and street)             that I am no longer subject to backup withholding.
- -------------------------------     CERTIFICATION INSTRUCTIONS--You must cross out item (2) above if you have been
City, State and Zip Code            notified by the IRS that you are subject to backup withholding because of
DEPARTMENT OF THE TREASURY          under-reported interest or dividends on your tax return. However, if after
INTERNAL REVENUE SERVICE            being notified by the IRS that you were subject to backup withholding you
PAYER'S REQUEST FOR TAXPAYER        received another notification from the IRS stating that you are no longer
IDENTIFICATION NUMBER (TIN)         subject to backup withholding, do not cross out item (2). If you are exempt
                                    from backup withholding, check the box in Part 2 above.
- -------------------------------------------------------------------------------------------------------------------
  Signature:
- ------------------------------------------------------------------------------------------------------------------- Date:
- --------------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------
</TABLE>
 
 NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM OF ELECTION AND LETTER OF
       TRANSMITTAL, INCLUDING THE SUBSTITUTE FORM W-9, MAY RESULT IN BACKUP
       WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE MERGER
       AGREEMENT. PLEASE REVIEW THE ENCLOSED "GUIDELINES FOR CERTIFICATION OF
       TAXPAYER IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9" FOR ADDITIONAL
       DETAILS.
 
           YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED
                 THE BOX IN PART 3 OF THE SUBSTITUTE FORM W-9.
 
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
 
      I certify under penalties of perjury that a taxpayer identification
 number has not been issued to me, and either (a) I have mailed or delivered an
 application to receive a taxpayer identification number to the appropriate
 Internal Revenue Service Center or Social Security Administration Office or
 (b) I intend to mail or deliver an application in the near future. I
 understand that if I do not provide a taxpayer identification number, 31% of
 all reportable payments made to me will be withheld until I provide such
 number.
 
 --------------------------------------------------------------
               --------------------------------------------------
                           Signature                Date
<PAGE>   15
 
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
 
 GUIDELINES FOR DETERMINING THE PROPER IDENTIFICATION NUMBER FOR THE PAYEE
 (YOU) TO GIVE THE PAYER. -- Social security numbers have nine digits separated
 by two hyphens: i.e., 000-00-0000. Employer identification numbers have nine
 digits separated by only one hyphen: i.e., 00-0000000. The table below will
 help determine the number to give the payer. All "Section" references are to
 the Internal Revenue Code of 1986, as amended. "IRS" is the Internal Revenue
 Service.
 
            -------------------------------------------------------
 
<TABLE>
<S>  <C>                       <C>
                               GIVE THE SOCIAL SECURITY
FOR THIS TYPE OF ACCOUNT:      NUMBER OF --
- -----------------------------------------------------------
 1.  Individual                The individual
 2.  Two or more               The actual owner of the
     individuals (joint        account or, if combined
     account)                  funds, the first individual
                               on the account(1)
 3.  Custodian account of a    The minor(2)
     minor (Uniform Gift to
     Minors Act)
 4.  a. The usual revocable    The grantor-trustee(1)
        savings trust
        account (grantor is
        also trustee)
     b. So-called trust ac-    The actual owner(1)
        count that is not a
        legal or valid
        trust under state
        law
 5.  Sole proprietorship       The owner(3)
- -----------------------------------------------------------
                               GIVE THE EMPLOYER
  FOR THIS TYPE OF ACCOUNT:    IDENTIFICATION NUMBER OF --
- -----------------------------------------------------------
 6.  Sole proprietorship       The owner(3)
 7.  A valid trust, estate,    The legal entity(4)
     or pension trust
 8.  Corporate                 The corporation
 9.  Association, club,        The organization
     religious, charitable,
     educational, or other
     tax-exempt
     organization
10.  Partnership               The partnership
11.  A broker or registered    The broker or nominee
     nominee
12.  Account with the De-      The public entity
     partment of
     Agriculture in the
     name of a public
     entity (such as a
     State or local
     government, school
     district, or prison)
     that receives
     agricultural program
     payments
</TABLE>
 
            -------------------------------------------------------
 
(1) List first and circle the name of the person whose number you furnish. If
    only one person on a joint account has a social security number, that
    person's number must be furnished.
(2) Circle the minor's name and furnish the minor's social security number.
(3) You must show your individual name, but you may also enter your business or
    "doing business as" name. You may use either your social security number or
    your employer identification number (if you have one).
(4) List first and circle the name of the legal trust, estate, or pension trust.
    (Do not furnish the taxpayer identification number of the personal
    representative or trustee unless the legal entity itself is not designated
    in the account title.)
 
NOTE: If no name is circled when there is more than one name listed, the number
      will be considered to be that of the first name listed.
            -------------------------------------------------------
 
OBTAINING A NUMBER
 
If you don't have a taxpayer identification number, obtain Form SS-5,
Application for a Social Security Card, at the local Social Security
Administration office, or Form SS-4, Application for Employer Identification
Number, by calling 1(800) TAX-FORM, and apply for a number.
 
PAYEES EXEMPT FROM BACKUP WITHHOLDING
 
Payees specifically exempted from withholding include:
 
- - An organization exempt from tax under Section 501(a), an individual retirement
  account (IRA), or a custodial account under Section 403(b)(7), if the account
  satisfies the requirements of Section 401(f)(2).
- - The United States or a state thereof, the District of Columbia, a possession
  of the United States, or a political subdivision or wholly-owned agency or
  instrumentality of any one or more of the foregoing.
- - An international organization or any agency or instrumentality thereof.
- - A foreign government and any political subdivision, agency or instrumentality
  thereof.
 
Payees that may be exempt from backup withholding include:
- - A corporation.
- - A financial institution.
- - A dealer in securities or commodities required to register in the United
  States, the District of Columbia, or a possession of the United States.
- - A real estate investment trust.
- - A common trust fund operated by a bank under Section 584(a).
- - An entity registered at all times during the tax year under the Investment
  Company Act of 1940.
- - A middleman known in the investment community as a nominee or who is listed in
  the most recent publication of the American Society of Corporate Secretaries,
  Inc., Nominee List.
- - A futures commission merchant registered with the Commodity Futures Trading
  Commission.
- - A foreign central bank of issue.
 
Payments of dividends and patronage dividends generally exempt from backup
withholding include:
- - Payments to nonresident aliens subject to withholding under Section 1441.
- - Payments to partnerships not engaged in a trade or business in the United
  States and that have at least one nonresident alien partner.
- - Payments of patronage dividends not paid in money.
- - Payments made by certain foreign organizations.
- - Section 404(k) payments made by an ESOP.
 
Payments of interest generally exempt from backup withholding include:
- - Payments of tax-exempt interest (including exempt-interest dividends under
  Section 852).
- - Payments described in Section 6049(b)(5) to nonresident aliens.
- - Payments on tax-free covenant bonds under Section 1451.
- - Payments made by certain foreign organizations.
 
Certain payments, other than payments of interest, dividends, and patronage
dividends, that are exempt from information reporting are also exempt from
backup withholding. For details, see Sections 6041, 6041A, 6042, 6044, 6045,
6049, 6050A and 6050N and the regulations thereunder.
 
EXEMPT PAYEES SHOULD COMPLETE A SUBSTITUTE FORM W-9 TO AVOID POSSIBLE ERRONEOUS
BACKUP WITHHOLDING. Furnish your taxpayer identification number, check the box
in Part 2 of the form, sign and date the form and return it to the payer.
 
PRIVACY ACT NOTICE. -- Section 6109 requires you to provide your correct
taxpayer identification number to payers who must report the payments to the
IRS. The IRS uses the numbers for identification purposes and to help verify the
accuracy of your return and may also provide this information to various
government agencies for tax enforcement or litigation purposes. Payers must be
given the numbers whether or not recipients are required to file tax returns.
Payers must generally withhold 31% of taxable interest, dividend, and certain
other payments to a payee who does not furnish a taxpayer identification number
to a payer. Certain penalties may also apply.
 
PENALTIES
 
(1) FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER. -- If you fail to furnish
your taxpayer identification number to a payer, you are subject to a penalty of
$50 for each such failure unless your failure is due to reasonable cause and not
to willful neglect.
 
(2) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING. -- If you
make a false statement with no reasonable basis that results in no backup
withholding, you are subject to a $500 penalty.
 
(3) CRIMINAL PENALTY FOR FALSIFYING INFORMATION. -- Willfully falsifying
certifications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.
 
                           FOR ADDITIONAL INFORMATION
                          CONTACT YOUR TAX CONSULTANT
                        OR THE INTERNAL REVENUE SERVICE.


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