Document:

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                                                                    EXHIBIT 10.1

                      SEPARATION AND DISTRIBUTION AGREEMENT

                                 BY AND BETWEEN

                                  AT&T CORP.,

                                       and

                         AT&T WIRELESS SERVICES, INC.

                            Dated as of June 4, 2001
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                                TABLE OF CONTENTS
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                                    ARTICLE I

                                   Definitions

                                   ARTICLE II

                                 The Separation

2.1.  Transfer of Assets and Assumption of Liabilities......................    18
2.2.  Termination of Agreements.............................................    20
2.3.  Documents Relating to Transfer of Real Property Interests and
      Tangible Property Located Thereon.....................................    21
2.4.  Documents Relating to Other Transfers of Assets and Assumption of
      Liabilities...........................................................    23
2.5.  Ancillary Agreements..................................................    23
2.6.  Disclaimer of Representations and Warranties..........................    23
2.7.  Governmental Approvals and Consents...................................    24
2.8.  Novation of Additional and Other Wireless Group Liabilities...........    25
2.9.  Satisfaction of Intercompany Debt and Preferred Stock.................    26
2.10. Joint Purchasing Arrangements.........................................    26
2.11. Certain Additional Transactions.......................................    27
2.12. Intellectual Property Matters.........................................    30
2.13. Wireless Constituent Documents........................................    30

                                   ARTICLE III

         Actions Pending the Mandatory Exchange and the Distribution

3.1.  Transactions Prior to the Mandatory Exchange and the Distribution.....    30
3.2.  Additional Distribution...............................................    31

                                   ARTICLE IV

                             The Mandatory Exchange

4.1.  The Mandatory Exchange................................................    31
4.2.  Actions Prior to the Mandatory Exchange...............................    32
4.3.  Conditions to Mandatory Exchange......................................    32
4.4.  Fractional Shares.....................................................    34
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                                    ARTICLE V

                                The Distribution

5.1.   The Distribution......................................................   34
5.2.   Actions Prior to the Distribution.....................................   35
5.3.   Conditions to Distribution............................................   36
5.4.   Fractional Shares.....................................................   36

                                   ARTICLE VI

                        Mutual Releases; Indemnification

6.1.   Release of Pre-Closing Claims.........................................   37
6.2.   Indemnification by Wireless...........................................   39
6.3.   Indemnification by Parent.............................................   40
6.4.   Indemnification Obligations Net of Insurance Proceeds and Other
       Amounts...............................................................   41
6.5.   Procedures for Indemnification of Third Party Claims..................   42
6.6.   Additional Matters....................................................   44
6.7.   Remedies Cumulative...................................................   44
6.8.   Survival of Indemnities...............................................   44
6.9.   Combined Service Claims; Similar Matters..............................   44
6.10.  Specified Matters.....................................................   45
6.11.  IPR Exception.........................................................   45

                                   ARTICLE VII

                       Insurance and Certain Other Matters

7.1.   Insurance Matters.....................................................   45
7.2.   Certain Post-Distribution Transactions and Related Matters............   47
7.3.   Procedure for Indemnification for Tax Liabilities.....................   50

                                  ARTICLE VIII

                   Exchange of Information; Confidentiality

8.1.   Agreement for Exchange of Information.................................   53
8.2.   Ownership of Information..............................................   54
8.3.   Compensation for Providing Information................................   54
8.4.   Record Retention......................................................   54
8.5.   Limitation of Liability...............................................   54
8.6.   Other Agreements Providing for Exchange of Information................   54
8.7.   Production of Witnesses; Records; Cooperation.........................   55
8.8.   Confidentiality.......................................................   56
8.9.   Protective Arrangements...............................................   57
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                                   ARTICLE IX

                 Further Assurances and Additional Covenants

9.1.   Further Assurances....................................................   57
9.2.   Parent Restructuring..................................................   58
9.3.   Patent License Agreements.............................................   59

                                    ARTICLE X

                                   Termination

10.1.  Termination...........................................................   60
10.2.  Effect of Termination.................................................   60

                                   ARTICLE XI

                       Dispute Resolution and Arbitration

11.1.  Agreement to Arbitrate................................................   60
11.2.  Best Efforts to Resolve Disputes; Mediation...........................   61
11.3.  Demand for Arbitration................................................   61
11.4.  Arbitration Panel.....................................................   62
11.5.  Commencement and Place of Arbitration.................................   62
11.6.  Arbitration Hearings..................................................   62
11.7.  Arbitration Decision..................................................   63
11.8.  Discovery and Related Matters.........................................   63
11.9.  Arbitration Panel's Authority.........................................   63
11.10. Confidentiality ......................................................   64
11.11. Certain Additional Matters ...........................................   64
11.12. Limited Court Actions ................................................   65
11.13. Continuity of Performance and Remaining Obligations ..................   65
11.14. Law Governing Arbitration Procedures..................................   66
11.15. Non-applicability of Article .........................................   66

                                   ARTICLE XII

                                  Miscellaneous

12.1.  Counterparts; Entire Agreement; Corporate Power.......................   66
12.2.  Governing Law.........................................................   67
12.3.  Assignability.........................................................   67
12.4.  Third Party Beneficiaries.............................................   68
12.5.  Notices...............................................................   68
12.6.  Severability..........................................................   68
12.7.  Force Majeure.........................................................   69
12.8.  Expenses..............................................................   69
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12.9.  Late Payments.........................................................   69
12.10. Headings .............................................................   69
12.11. Survival of Covenants ................................................   69
12.12. Waivers of Default ...................................................   70
12.13. Specific Performance .................................................   70
12.14. Amendments ...........................................................   70
12.15. Interpretation .......................................................   70
12.16. Effectiveness ........................................................   71
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         SEPARATION AND DISTRIBUTION AGREEMENT, dated as of June 4, 2001 (this
"Agreement"), by and between AT&T Corp., a New York corporation ("Parent"), and
AT&T Wireless Services, Inc., a Delaware corporation and wholly owned subsidiary
of Parent ("Wireless").

         WHEREAS, the respective Boards of Directors of Parent and Wireless have
approved and declared advisable the separation of the Wireless Group as defined
in Parent's amended and restated certificate of incorporation (the "Parent
Charter") from Parent (the "Separation"), pursuant to the terms and subject to
the conditions set forth in this Agreement;

         WHEREAS, prior to the Separation, the Board of Directors of Parent has
elected to distribute additional shares (the "Additional Distribution") of
Parent's Wireless Group Common Stock, par value $1.00 per share (the "Parent
Wireless Group Common Stock"), by exchange offer, with the effect of
proportionately decreasing the Parent Group's intergroup interest in the
Wireless Group;

         WHEREAS, to effect the Separation, (1) all the assets and liabilities
of the Wireless Group not currently held by Wireless and its subsidiaries will
be assigned to and assumed by Wireless, (2) the Wireless Group will satisfy
certain inter-group obligations with the Parent Group, (3) all the then issued
and outstanding shares of Parent Wireless Group Common Stock will be redeemed in
exchange for shares of Wireless Common Stock in accordance with the Parent
Charter (the "Mandatory Exchange"), and (4) substantially all of Parent's
remaining interest in Wireless will be distributed pro rata (the "Distribution")
to holders of shares of Parent's Common Stock, par value $1.00 per share, of
Parent (the "Parent Common Stock");

         WHEREAS, the Boards of Directors of Parent and Wireless have determined
that the Separation, the Mandatory Exchange and the Distribution are in
furtherance of and consistent with their respective business strategies and are
in the best interests of their stockholders and have approved this Agreement;

         WHEREAS, for federal income tax purposes, it is intended that the
Separation Transactions constitute a tax-free reorganization under the Code (as
defined below); and

         WHEREAS, it is appropriate and desirable to set forth the principal
corporate transactions required to effect the Separation Transactions and
certain other agreements that will govern certain matters relating to the
Separation, the Mandatory Exchange and the Distribution and the relationship of
Parent, Wireless and their respective Subsidiaries following the Separation, the
Mandatory Exchange and the Distribution.

         NOW, THEREFORE, the parties, intending to be legally bound, agree as
follows:

                                   ARTICLE I.

                                  DEFINITIONS

         For the purpose of this Agreement the following terms shall have the
following meanings:
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         1.1. Action means any demand, action, suit, countersuit, arbitration,
inquiry, proceeding or investigation by or before any federal, state, local,
foreign or international Governmental Authority or any arbitration or mediation
tribunal.

         1.2. Additional Distribution has the meaning set forth in the recitals
hereto.

         1.3. Additional Wireless Group Assets means:

         (a) all Wireless Group Assets not currently held, directly or
indirectly, by Wireless or its Subsidiaries, including those Assets listed on
Schedule 1.3(a);

         (b) any and all Assets that are expressly contemplated by this
Agreement or any Ancillary Agreement (or any Schedule hereto or thereto) as
Assets to be transferred to Wireless or any other member of the Wireless Group;

         (c) any Assets reflected in the Wireless Group Balance Sheet but not
currently held by Wireless or its Subsidiaries, subject to any dispositions of
such Assets subsequent to the date of the Wireless Group Balance Sheet;

         (d) any Wireless Group Contracts;

         (e) any Assets listed on Schedule 1.3(e) hereto, provided that the
Wireless Group shall have paid to the Parent Group the consideration specified
on such Schedule;

         (f) any CIC codes and other Assets listed on Schedule 1.3(f) hereto;
and

         (g) CPAC.

Notwithstanding the foregoing, the Additional Wireless Group Assets and the
Wireless Group Assets shall not in any event include the Excluded Assets.

         1.4. Additional Wireless Group Liabilities means, in each case whether
arising before, on or after the Redemption Date:

         (a) all Wireless Group Liabilities to which Wireless or its
Subsidiaries are not currently directly or indirectly subject;

         (b) any and all Liabilities that are expressly contemplated by this
Agreement or any Ancillary Agreement (or the Schedules hereto or thereto) as
Liabilities to be assumed by

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Wireless or any member of the Wireless Group, and all agreements, obligations
and Liabilities of any member of the Wireless Group under this Agreement or any
of the Ancillary Agreements;

         (c) all Liabilities to the extent relating to, arising out of or
resulting from the operation of the Wireless Group, as conducted at any time
prior to, on or after the Redemption Date or the operation of any business
conducted by any member of the Wireless Group at any time after the Redemption
Date, including any Liabilities resulting from the offering of any wireless
services;

         (d) all Liabilities to the extent relating to, arising out of or
resulting from any Wireless Group Contract, Wireless Group Asset or any
Additional Wireless Group Asset, including any Delayed Transfer Asset;

         (e) all Liabilities to the extent relating to, arising out of or
resulting from any of the terminated, divested or discontinued businesses and
operations that were part of the Wireless Group immediately prior to such
termination, divestiture or discontinuation, or otherwise, including those
listed or described on Schedule 1.4(e);

         (f) all Liabilities reflected as liabilities or obligations of the
Wireless Group in the Wireless Group Balance Sheet but that are not currently
direct or indirect liabilities of Wireless or its Subsidiaries, subject to any
discharge of such Liabilities subsequent to the date of the Wireless Group
Balance Sheet;

         (g) (1) all Liabilities relating to, arising out of or resulting from
the Actions listed on Schedule 1.4(g) hereto (it being agreed that after the
Redemption Date the parties will supplement such Schedule to list any Actions
that would otherwise constitute Wireless Group Liabilities or Additional
Wireless Group Liabilities), whether arising before, on or after the Redemption
Date, as currently asserted in such Actions and any future Liabilities in such
Actions to the extent they would otherwise constitute Wireless Group Liabilities
or Additional Wireless Group Liabilities, and (2) all Liabilities relating to,
arising out of or resulting from all open or closed insured liability claims,
including auto and general liability claims, incurred by or relating to the
Wireless Group or its current, past or future employees;

         (h) all Combined Service Claims and other Liabilities to the extent
relating to the provision of (or failure to provide) any wireless services or
any other telecommunications services offered by any member of the Wireless
Group;

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         (i) subject to Section 2.11(c), all Liabilities relating to, arising
out of or resulting from the Malaysian Action, whether arising before, on or
after the Redemption Date;

         (j) except as expressly set forth herein or in any Ancillary Agreement,
one-half of all Liabilities relating to, arising out of, or resulting from the
consummation of the Separation Transactions (it being agreed that all
Liabilities relating to, arising out of or resulting from any untrue statement
or alleged untrue statement of a material fact or omission or alleged omission
to state a material fact required to be stated therein or necessary to make the
statements therein not misleading contained in any Registration Statement or
other document or in any registration statement or other document relating to
any exchange offer commenced in connection with any Additional Distribution
shall be allocated in accordance with Section 6.2(d) and Section 6.3(d) and not
pursuant to this clause);

         (k)(i) any supply or vendor contract or agreement, or (ii) any other
contracts or agreements, in each case listed or described on Schedule 1.4(k), in
each case except to the extent exclusions are set forth on such Schedule and
otherwise subject to the terms and conditions of such Schedule;

         (l) any contract or agreement entered into by Parent or any other
member of the Parent Group that prior to the Separation bound any member of the
Wireless Group in its capacity as a Subsidiary, Affiliate or division of Parent
or of such other member, to the extent any member of the Wireless Group is
required by the terms of such contract or agreement to comply with, or is
otherwise bound by, any such contract or agreement after the Redemption Date;
and

         (m) 70% of any Liabilities relating to, arising out of or resulting
from any of the Actions listed on Schedule 1.4(m) or any Actions involving
similar allegations (collectively, the "Specified Matters") to the extent
payable to or on behalf of any past, current or future holders of shares of
Parent Wireless Group Common Stock (including any such shares sold in the
initial public offering thereof or to any purchasers thereof) or to the extent
relating to any transactions therein.

         Notwithstanding the foregoing, the Additional Wireless Group
Liabilities shall not include the Excluded Liabilities.

         1.5. Affiliate of any Person means a Person that controls, is
controlled by, or is under common control with such Person. As used herein,
"control" means the possession, directly or indirectly, of the power to direct
or cause the direction of the management and

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policies of such entity, whether through ownership of voting securities or other
interests, by contract or otherwise; provided however that for purposes of this
Agreement, no member of either Group shall be deemed to be an Affiliate of any
member of the other Group and no employee plan or employee plan trust shall be
deemed an Affiliate of any employer or of any Affiliate of any employer.

         1.6. Agent means the distribution agent to be appointed by Parent to
distribute the shares of Wireless Common Stock to holders of shares of Parent
Wireless Group Common Stock in the Mandatory Exchange and to holders of Parent
Common Stock in the Distribution.

         1.7. Agreement means this Separation and Distribution Agreement,
including all of the Schedules and Exhibits hereto.

         1.8. Ancillary Agreements means those agreements and other documents
listed on Schedule 1.8.

         1.9. ARIC means American Ridge Insurance Company, a Vermont
corporation.

         1.10. ARIC Wireless Policies means any insurance policies written by
ARIC or any other captive insurance company of Parent to the extent covering the
Wireless Group Business or any member of the Wireless Group, as set forth on
Schedule 1.10.

         1.11. Assets means assets, properties and rights (including goodwill),
wherever located (including in the possession of vendors or other third parties
or elsewhere), whether real, personal or mixed, tangible, intangible or
contingent, in each case whether or not recorded or reflected or required to be
recorded or reflected on the books and records or financial statements of any
Person, including the following:

                  (a) all accounting and other books, records and files whether
         in paper, microfilm, microfiche, computer tape or disc, magnetic tape
         or any other form;

                  (b) all apparatus, computers and other electronic data
         processing equipment, fixtures, machinery, equipment, furniture, office
         equipment, automobiles, trucks, aircraft, rolling stock, vessels, motor
         vehicles and other transportation equipment, special and general tools,
         test devices, prototypes and models and other tangible personal
         property;

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                  (c) all inventories of materials, parts, raw materials,
         supplies, work-in-process and finished goods and products;

                  (d) all interests in real property of whatever nature,
         including easements, whether as owner, mortgagee or holder of a
         Security Interest in real property, lessor, sublessor, lessee,
         sublessee or otherwise, and copies of all related documentation;

                  (e) all interests in any capital stock or other equity
         interests of any Subsidiary or any other Person, all bonds, notes,
         debentures or other securities issued by any Subsidiary or any other
         Person, all loans, advances or other extensions of credit or capital
         contributions to any Subsidiary or any other Person and all other
         investments in securities of any Person;

                  (f) all license agreements, leases of personal property, open
         purchase orders for raw materials, supplies, parts or services,
         unfilled orders for the manufacture and sale of products and other
         contracts, agreements or commitments;

                  (g) all deposits, letters of credit and performance and surety
         bonds;

                  (h) all written technical information, data, specifications,
         research and development information, engineering drawings, operating
         and maintenance manuals, and materials and analyses prepared by
         consultants and other third parties;

                  (i) all domestic and foreign patents, copyrights, trade names,
         trademarks, service marks and registrations and applications for any of
         the foregoing, mask works, trade secrets, inventions, other proprietary
         information and licenses from third Persons granting the right to use
         any of the foregoing;

                  (j) all computer applications, programs and other software,
         including operating software, network software, firmware, middleware,
         design software, design tools, systems documentation and instructions;

                  (k) all cost information, sales and pricing data, customer
         prospect lists, supplier records, customer and supplier lists, records
         pertaining to customers and customer accounts, customer and vendor
         data, correspondence and lists, product literature, advertising
         material, artwork, design, development and manufacturing files, vendor
         and customer drawings, formulations and specifications, quality records
         and reports and other books, records, studies, surveys, reports, plans
         and documents;

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                  (l) all prepaid expenses, trade accounts and other accounts
         and notes receivables;

                  (m) all rights under contracts or agreements, all claims or
         rights against any Person arising from the ownership of any Asset, all
         rights in connection with any bids or offers and all claims, choses in
         action or similar rights, whether accrued or contingent;

                  (n) all rights under insurance policies and all rights in the
         nature of insurance, indemnification or contribution;

                  (o) all licenses (including radio and similar licenses),
         permits, approvals and authorizations which have been issued by any
         Governmental Authority;

                  (p) cash or cash equivalents, bank accounts, lock boxes and
         other deposit arrangements;

                  (q) copies of all documentation related to any ARIC Wireless
         Policies or any other Insurance Policies to the extent applicable to
         the Wireless Group; and

                  (r) interest rate, currency, commodity or other swap, collar,
         cap or other hedging or similar agreements or arrangements.

         1.12. Change of Control with respect to either Parent or Wireless, as
applicable, shall mean the occurrence of any of the following, in each case to
the extent involving (whether as a result of an acquisition of shares,
participation in a proxy fight or consent solicitation, participation in a
Business Combination or otherwise) directly or indirectly (including as a member
of a group) a Covered Person with respect to Parent or Wireless, respectively:

         (a) The acquisition by any Person or group of Persons of beneficial
ownership (for all purposes hereof, within the meaning of Rule 13d-3
promulgated under the Securities Exchange Act of 1934, as amended) of 40% or
more of either (i) the then outstanding shares of common stock of the Person
(the "Outstanding Company Common Stock") or (ii) the combined voting power of
the then outstanding voting securities of the Person entitled to vote generally
in the election of directors of such Person (the "Outstanding Company Voting
Securities"); provided, however, that for purposes of this paragraph (a), any
acquisition by any Person pursuant to a Business Combination (as defined below)
that complies with clauses (i), (ii) and (iii) of paragraph (c) of this
definition shall not be a Change of Control; or

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         (b) Individuals who, as of the date of this Agreement, constitute the
board of directors or other similar governing body of such Person (the
"Incumbent Board") cease for any reason to constitute at least a majority of the
board or other similar governing body of such Person; provided, however, that
any individual becoming a director, or having similar management supervisory
functions (a "director") subsequent to the date of this Agreement whose
election, or nomination for election by such Person's shareholders, was approved
by a vote of at least a majority of the directors then comprising the Incumbent
Board shall be considered as though such individual were a member of the
Incumbent Board, but excluding, for this purpose, any such individual whose
initial assumption of office occurs as a result of an actual or threatened
election contest with respect to the election or removal of directors or other
actual or threatened solicitation of proxies or consents by or on behalf of a
Person other than the Incumbent Board of such Person; or

         (c) Consummation of a reorganization, merger or consolidation, sale or
other disposition of all or substantially all of the assets or shares of such
Person or any similar transaction involving such Person (a "Business
Combination"), in each case, unless, following such Business Combination, (i)
all or substantially all of the Persons who were the beneficial owners,
respectively, of the Outstanding Company Common Stock and Outstanding Company
Voting Securities of the applicable Person immediately prior to such Business
Combination beneficially own, directly or indirectly, 60% or more of,
respectively, the then Outstanding Company Common Stock and the then Outstanding
Company Voting Securities, as the case may be, of the Person or Persons
resulting from such Business Combination (including a Person or Persons which as
a result of such transaction own the applicable Person or all or substantially
all of the applicable Person's assets either directly or through one or more
Subsidiaries) (such resulting Person or Persons, as applicable, a "Resulting
Corporation") in substantially the same proportions as their ownership,
immediately prior to such Business Combination of the Outstanding Company Common
Stock and Outstanding Company Voting Securities of the applicable Person, as the
case may be, (ii) no Person or group of Persons (excluding any Resulting
Corporation) beneficially owns, directly or indirectly, 40% or more of,
respectively, the then Outstanding Company Common Stock of the Resulting
Corporation or the then Outstanding Company Voting Securities of the Resulting
Corporation, and (iii) at least a majority of the members of the board of
directors or other similar governing body of the Resulting Corporation were
members or were considered members of the Incumbent Board prior to the time of
the execution of the initial agreement, or of the initial action of the board or
other similar governing body, providing for such Business Combination; or

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         (d) Approval by the shareholders of such Person of a complete
liquidation or dissolution of such Person;

provided however that the transactions announced by Parent prior to the date of
this Agreement shall not result in a Change of Control.

         1.13. Code means the Internal Revenue Code of 1986, as amended.

         1.14. Combined Service Claims means any pending or threatened Action
(whether pending or threatened prior to, as of or after the Redemption Date) by
any Person or Governmental Authority that relates or purports to relate to
telecommunications services provided (or failed to be provided) by any member of
the Wireless Group and any member of the Parent Group.

         1.15. Commission means the Securities and Exchange Commission.

         1.16. Consents means any consents, waivers or approvals from, or
notification requirements to, any third parties.

         1.17. Control means the direct or indirect power affirmatively to
direct the management and policies of a Person, whether through the ownership of
voting securities, by agreement or otherwise.

         1.18. Covered Person means (a) in the case of Parent, any Person that
collectively with its Affiliates and Subsidiaries, during the 12-month period
preceding the date of consummation of the applicable event that might constitute
a Change of Control, had United States Commercial Mobile Radio Services and
fixed wireless revenue of at least $1 billion in the aggregate, and (b) in the
case of the Wireless, any Person that collectively with its Affiliates and
Subsidiaries, during the 12-month period preceding the date of consummation of
the applicable event that might constitute a Change of Control, had United
States wireline telecommunications revenue (including voice, data and IP) of at
least $3 billion in the aggregate.

         1.19. Covered Subsidiary means any of the Persons that are contemplated
by the current restructuring plan to be distributed by Parent to its
shareholders and that may be entitled to use the AT&T brand.

         1.20. CPAC means Cellular Phone Assurance Company, Ltd., an insurance
company domiciled in Bermuda.

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         1.21. Delayed Transfer Assets means any Additional Wireless Group
Assets that this Agreement or any Ancillary Agreement provides or contemplates
may be transferred after the Redemption Date, including as a result of the
advisability of seeking any regulatory approval or third party consent.

         1.22. Distribution has the meaning set forth in the recitals of this
Agreement.

         1.23. Distribution Date means the date determined pursuant to Section
5.1 on which the Distribution occurs.

         1.24. Effective Time means the time designated by the Board of
Directors of Parent as the effective time of the Distribution on the
Distribution Date.

         1.25. Environmental Law means any federal, state, local, foreign or
international statute, ordinance, rule, regulation, code, license, permit,
authorization, approval, consent, common law (including tort and environmental
nuisance law), legal doctrine, order, judgment, decree, injunction, requirement
or agreement with any Governmental Authority, now or hereafter in effect
relating to health, safety, pollution or the environment (including ambient air,
surface water, groundwater, land surface or subsurface strata) or to emissions,
discharges, releases or threatened releases of any substance currently or at any
time hereafter listed, defined, designated or classified as hazardous, toxic,
waste, radioactive or dangerous, or otherwise regulated, under any of the
foregoing, or otherwise relating to the manufacture, processing, distribution,
use, treatment, storage, disposal, transport or handling of any such substances,
including the Comprehensive Environmental Response, Compensation and Liability
Act, the Superfund Amendments and Reauthorization Act and the Resource
Conservation and Recovery Act and comparable provisions in state, local, foreign
or international law.

         1.26. Environmental Liabilities means all Liabilities relating to,
arising out of or resulting from any Environmental Law or contract or agreement
relating to environmental, health or safety matters (including all removal,
remediation or cleanup costs, investigatory costs, governmental response costs,
natural resources damages, property damages, personal injury damages, costs of
compliance with any settlement, judgment or other determination of Liability and
indemnity, contribution or similar obligations) and all costs and expenses,
interest, fines, penalties or other monetary sanctions in connection therewith.

         1.27. Exchange Act means the Securities Exchange Act of 1934, as
amended, together with the rules and regulations promulgated thereunder.

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         1.28. Excluded Assets means (i) the Assets listed or described on
Schedule 1.28, provided that the Parent Group shall have paid to the Wireless
Group the consideration specified on such Schedule or contemplated by the
applicable Ancillary Agreement; (ii) Parent Group IPR, (iii) any CIC codes or
other Assets of the type listed on Schedule 1.3(f) that are not listed on
Schedule 1.3(f) hereto, (iv) any and all Assets that are expressly contemplated
by this Agreement or any Ancillary Agreement (or the Schedules hereto or
thereto) as Assets to be retained by Parent or any other member of the Parent
Group, (v) any Parent Assets, and (vi) any Assets that would be Wireless Group
Assets or Additional Wireless Group Assets that the parties mutually agree in
writing (as evidenced by a separate agreement) prior to the Redemption Date
should remain with the Parent Group in exchange for payment by the Parent Group
of the fair market value thereof.

         1.29. Excluded Liabilities means any and all Liabilities that are
expressly contemplated by this Agreement or any Ancillary Agreement (or the
Schedules hereto or thereto) as Liabilities to be retained or assumed by Parent
or any other member of the Parent Group, and all agreements and obligations of
any member of the Parent Group under this Agreement or any of the Ancillary
Agreements. For purposes of clarification, the following shall be Excluded
Liabilities: (a) 30% of any Liabilities relating to, arising out of or resulting
from any of the Specified Matters to the extent payable to or on behalf of any
past, current or future holders of shares of Parent Wireless Group Common Stock
(including any such shares sold in the initial public offering thereof or to any
purchasers thereof) or to the extent relating to any transactions therein, and
(b) all Liabilities relating to, arising out of or resulting from any of the
Specified Matters to the extent payable to or on behalf of any past, current or
future holders of shares of Parent Common Stock or to the extent relating to any
transactions therein.

         1.30. Governmental Approvals means any notices, reports or other
filings to be made, or any consents, registrations, approvals, permits or
authorizations to be obtained from, any Governmental Authority.

         1.31. Governmental Authority shall mean any federal, state, local,
foreign or international court, government, department, commission, board,
bureau, agency, official or other regulatory, administrative or governmental
authority.

         1.32. Group means either of the Parent Group or the Wireless Group as
the context requires.

         1.33. Indemnifying Party has the meaning set forth in Section 6.4(a).

                                      -11-
<PAGE>   17
         1.34. Indemnitee has the meaning set forth in Section 6.4(a).

         1.35. Indemnity Payment has the meaning set forth in Section 6.4(a).

         1.36. Information means information, whether or not patentable or
copyrightable, in written, oral, electronic or other tangible or intangible
forms, stored in any medium, including studies, reports, records, books,
contracts, instruments, surveys, discoveries, ideas, concepts, know-how,
techniques, designs, specifications, drawings, blueprints, diagrams, models,
prototypes, samples, flow charts, data, computer data, disks, diskettes, tapes,
computer programs or other software, marketing plans, customer names,
communications by or to attorneys (including attorney-client privileged
communications), memos and other materials prepared by attorneys or under their
direction (including attorney work product), and other technical, financial,
employee or business information or data.

         1.37. Insurance Proceeds means those monies:

                  (a) received by an insured from an insurance carrier;

                  (b) paid by an insurance carrier on behalf of the insured; or

                  (c) received (including by way of set off) from ARIC or any of
         its Subsidiaries or from any third party in the nature of insurance,
         contribution or indemnification in respect of any Liability;

in any such case net of any applicable premium adjustments (including reserves
and retrospectively rated premium adjustments) and net of any costs or expenses
incurred in the collection thereof.

         1.38. Liabilities means any and all losses, claims, charges, debts,
demands, Actions, damages, obligations, payments, costs and expenses, sums of
money, bonds, indemnities and similar obligations, covenants, contracts,
controversies, agreements, promises, omissions, guarantees, make whole
agreements and similar obligations, and other liabilities, including all
contractual obligations, whether absolute or contingent, inchoate or otherwise,
matured or unmatured, liquidated or unliquidated, accrued or unaccrued, known or
unknown, whenever arising, and including those arising under any law, rule,
regulation, Action, threatened or contemplated Action (including the costs and
expenses of demands, assessments, judgments, settlements and compromises
relating thereto and attorneys' fees and any and all costs and expenses,
whatsoever reasonably incurred in investigating, preparing or defending against
any

                                      -12-
<PAGE>   18
such Actions or threatened or contemplated Actions), order or consent decree of
any Governmental Authority or any award of any arbitrator or mediator of any
kind, and those arising under any contract, commitment or undertaking, including
those arising under this Agreement or any Ancillary Agreement, in each case,
whether or not recorded or reflected or required to be recorded or reflected on
the books and records or financial statements of any Person.

         1.39. Liberty Media Group has the meaning set forth in the Parent
Charter.

         1.40. Malaysian Action means all Liabilities arising out of or
resulting from the Action captioned In re International Arbitration between
Usaha Tegas Sdn Bhd et al. And MediaOne Far East Telecommunications, Inc.
pending with respect to the Malaysian Wireless Assets or any other Actions to
the extent involving similar allegations.

         1.41. Malaysian Asset Proceeds has the meaning set forth in Section
2.11(c).

         1.42. Malaysian Wireless Assets means MediaOne Far sEast
Telecommunications, Inc.

         1.43. Mandatory Exchange has the meaning specified in the recitals to
this Agreement.

         1.44. Nasdaq NMS means The National Market System of the National
Association of Securities Dealers Automated Quotations System.

         1.45. Non-Wireless Group Assets means any Assets of Parent or any of
its Affiliates other than Wireless Group Assets and Additional Wireless Group
Assets.

         1.46. NYSE means The New York Stock Exchange, Inc.

         1.47. Parent has the meaning set forth in the preamble to this
Agreement.

         1.48. Parent Assets means any Assets held by any member of the Wireless
Group that are not Wireless Group Assets or Additional Wireless Group Assets,
including those Assets listed on Schedule 1.48.

         1.49. Parent Charter has the meaning set forth in the recitals to this
Agreement.

                                      -13-
<PAGE>   19
         1.50. Parent Common Stock has the meaning set forth in the recitals to
this Agreement.

         1.51. Parent Group means Parent and each Person (other than any member
of the Wireless Group or any member of the Liberty Media Group) that is an
Affiliate of Parent immediately after the Distribution Date.

         1.52. Parent Group IPR means any and all intellectual property rights
protectable by law anywhere throughout the world, which, immediately prior to
the Redemption Date, are owned or controlled by any member of the Parent Group.
Without limiting the foregoing, Parent Group IPR includes any and all of the
following owned or controlled by any member of the Parent Group immediately
prior to the Redemption Date: all domestic and foreign patents, copyrights,
trade names, trademarks, service marks and registrations and applications for
any of the foregoing, mask works, trade secrets, inventions, other proprietary
information and licenses from third Persons granting the right to use any of the
foregoing; all computer applications, programs and other software, including
operating software, network software, firmware, middleware, design software,
design tools, systems documentation and instructions; all intellectual property
license agreements; all written technical information, data, specifications,
research and development information, engineering drawings, operating and
maintenance manuals, and materials and analyses prepared by consultants and
other third parties; and all cost information, sales and pricing data, customer
prospect lists, supplier records, customer and supplier lists, records
pertaining to customers and customer accounts, customer and vendor data,
correspondence and lists, product literature, advertising materials, artwork,
design, development and manufacturing files, vendor and customer drawings,
formulations and specifications, quality records and reports and other books,
records, studies, surveys, reports, plans and documents.

         1.53. Parent Indemnitees has the meaning set forth in Section 6.2.

         1.54. Parent Wireless Group Common Stock has the meaning set forth in
the recitals to this Agreement.

         1.55. Person means an individual, a general or limited partnership, a
corporation, a trust, a joint venture, an unincorporated organization, a limited
liability entity, any other entity and any Governmental Authority.

         1.56. Prime Rate means the rate which The Chase Manhattan Bank (or any
successor thereto or other major money center commercial bank agreed to by the
parties hereto) announces from time to time as its prime lending rate, as in
effect from time to time.

                                      -14-
<PAGE>   20
         1.57. Proposed Acquisition Transaction has the meaning set forth in
Section 7.2.

         1.58. Real Property Instruments has the meaning set forth in Section
2.3.

         1.59. Redemption Date the date determined pursuant to Section 5.1 on
which the Mandatory Exchange occurs.

         1.60. Record Date means the close of business on the date to be
determined by the Parent Board of Directors as the record date for determining
shareholders of Parent entitled to receive shares of Wireless Common Stock in
the Mandatory Exchange and the Distribution.

         1.61. Registration Statements means any (a) Registration Statement on
Form S-4 filed or to be filed by Parent with the Commission in connection with
any Additional Distribution effected by means of an exchange offer and (b) any
Registration Statement on Form S-1 filed or to be filed by Wireless and/or
Parent with the Commission with respect to Wireless Common Stock, in each case
including any amendment thereto or supplement thereof.

         1.62. Representation Letter has the meaning set forth in Section 7.2.

         1.63. Securities Act means the Securities Act of 1933, as amended,
together with the rules and regulations promulgated thereunder.

         1.64. Security Interest means any mortgage, security interest, pledge,
lien, charge, claim, option, right to acquire, voting or other restriction,
right-of-way, covenant, condition, easement, encroachment, restriction on
transfer, or other encumbrance of any nature whatsoever.

         1.65. Separation has the meaning set forth in the recitals to this
Agreement.

         1.66. Separation Transactions means (1) the transfer of certain
Wireless Group Assets and certain Wireless Group Liabilities to Wireless or its
Subsidiaries, (2) the Mandatory Exchange and (3) the Distribution, in each case
pursuant to the plan of reorganization.

         1.67. Specified Matters has the meaning set forth in the definition of
Additional Wireless Group Liabilities.

         1.68. Spin-Off Disqualification has the meaning set forth in Section
7.2.

         1.69. Subsequent Tax Opinion/Ruling has the meaning set forth in
Section 7.2.

                                      -15-
<PAGE>   21
         1.70. Subsidiary of any Person means any corporation or other
organization whether incorporated or unincorporated of which at least a majority
of the securities or interests having by the terms thereof ordinary voting power
to elect at least a majority of the board of directors or others performing
similar functions with respect to such corporation or other organization is
directly or indirectly owned or controlled by such Person or by any one or more
of its Subsidiaries, or by such Person and one or more of its Subsidiaries;
provided, however that no Person that is not directly or indirectly wholly owned
by any other Person shall be a Subsidiary of such other Person unless such other
Person controls, or has the right, power or ability to control, that Person.

         1.71. Tax Opinions/Rulings has the meaning set forth in Section 7.2.

         1.72. Tax Related Losses has the meaning set forth in Section 7.2.

         1.73. Tax Sharing Agreement means the Tax Sharing Agreement to be
entered into between Parent and Wireless prior to the Distribution Date.

         1.74. Taxes has the meaning set forth in the Tax Sharing Agreement.

         1.75. Third Party Claim has the meaning set forth in Section 6.5(a).

         1.76. Third Party Tax Claim has the meaning set forth in Section 7.3.

         1.77. Wireless has the meaning set forth in the preamble to this
Agreement.

         1.78. Wireless Common Stock means all issued and outstanding shares of
Common Stock, par value $0.01, of Wireless, all of which is currently held,
directly or indirectly, by Parent.

         1.79. Wireless Group has the meaning set forth in the Parent Charter.

         1.80. Wireless Group Allocation Fraction has the meaning set forth in
the Parent Charter.

         1.81. Wireless Group Assets means all Assets that are attributed to the
Wireless Group as of the Redemption Date pursuant to the Parent Charter.

         1.82. Wireless Group Balance Sheet means the audited combined balance
sheet of the Wireless Group, including the notes thereto, as of December 31,
2000.

                                      -16-
<PAGE>   22
         1.83. Wireless Group Contracts means the following contracts and
agreements to which Parent or any of its Affiliates is a party or by which it or
any of its Affiliates or any of their respective Assets is bound, whether or not
in writing, except for any such contract or agreement that is contemplated to be
retained by Parent or any member of the Parent Group pursuant to any provision
of this Agreement or any Ancillary Agreement:

                  (a) any contract or agreement entered into in the name of, or
         expressly on behalf of, any division, business unit or member of the
         Wireless Group, including customer contracts and any open purchase
         orders or similar commitments;

                  (b) any contract or agreement that is otherwise expressly
         contemplated pursuant to this Agreement or any of the Ancillary
         Agreements to be assigned to Wireless or any member of the Wireless
         Group;

                  (c) any guarantee, indemnity, representation, warranty or
         other Liability of any member of the Wireless Group or the Parent Group
         in respect of any other Wireless Group Contract, any Additional
         Wireless Group Liability, any Wireless Group Liability or the Wireless
         Group (including guarantees of financing incurred by customers or other
         third parties in connection with purchases of products or services from
         the Wireless Group);

                  (d) the contracts, agreements and other documents listed or
         described on Schedule 1.83(d); and

                  (e) any customer contracts in the name of a member of the
         Parent Group that include both Parent Group services and Wireless Group
         services, but only to the extent related to the provision of wireless
         services by the Wireless Group and only to the extent the Wireless
         Group has previously received revenue thereunder relating to the
         provision of wireless services (it being agreed that (1)
         notwithstanding anything to the contrary herein such contracts will not
         be assigned to the Wireless Group, (2) the Wireless Group shall be
         required to satisfy the obligations to provide wireless services
         thereunder, (3) if a customer under any such contract defaults with
         respect to its obligations relating to the wireless services provided
         under any such contract, Wireless shall be entitled to exercise any
         remedies provided for in any such contract in the event of any such
         breach relating to wireless services, (4) prior to Wireless's
         exercising any remedy under clause (3) hereof, Wireless shall confer in
         good faith with Parent concerning the best means to avoid damaging the
         overall relationship with the customer, and (5) after the Redemption
         Date,

                                      -17-
<PAGE>   23
         Wireless and Parent shall continue to allocate revenue thereunder in
         accordance with past practices).

         1.84. Wireless Group Indemnitees has the meaning set forth in Section
6.3(a).

         1.85. Wireless Group IPR means any and all intellectual property rights
protectable by law anywhere throughout the world, which, immediately prior to
the Redemption Date, are owned or controlled by any member of the Wireless
Group. Without limiting the foregoing, Wireless Group IPR includes any and all
of the following owned or controlled by any member of the Wireless Group
immediately prior to the Redemption Date: all domestic and foreign patents,
copyrights, trade names, trademarks, service marks and registrations and
applications for any of the foregoing, mask works, trade secrets, inventions,
other proprietary information and licenses from third Persons granting the right
to use any of the foregoing; all computer applications, programs and other
software, including operating software, network software, firmware, middleware,
design software, design tools, systems documentation and instructions; all
intellectual property license agreements; all written technical information,
data, specifications, research and development information, engineering
drawings, operating and maintenance manuals, and materials and analyses prepared
by consultants and other third parties; and all cost information, sales and
pricing data, customer prospect lists, supplier records, customer and supplier
lists, records pertaining to customers and customer accounts, customer and
vendor data, correspondence and lists, product literature, advertising
materials, artwork, design, development and manufacturing files, vendor and
customer drawings, formulations and specifications, quality records and reports
and other books, records, studies, surveys, reports, plans and documents.

         1.86. Wireless Group Liabilities means all Liabilities that are
attributed to the Wireless Group as of the Redemption Date pursuant to the
Parent Charter.

         1.87. Wireless Group Members means Wireless and each other Person that
is controlled directly or indirectly by Wireless immediately after the
Redemption Date.

                                   ARTICLE II

                                 THE SEPARATION

         2.1. Transfer of Assets and Assumption of Liabilities. (a) Parent
agrees on or prior to the Redemption Date to assign, transfer, convey and
deliver to Wireless, and to cause its applicable Subsidiaries to assign,
transfer, convey and deliver to Wireless, and Wireless agrees to

                                      -18-
<PAGE>   24
accept from Parent and its Subsidiaries, all of Parent's and its applicable
Subsidiaries' respective right, title and interest in all Additional Wireless
Group Assets, other than the Delayed Transfer Assets.

         (b) Wireless agrees from and after the Redemption Date faithfully to
perform and fulfill all the Additional Wireless Group Liabilities in accordance
with their respective terms and to assume obligations to defend Actions which
constitute Wireless Group Liabilities or Additional Wireless Group Liabilities.
From and after such date, Wireless shall be responsible for all Additional
Wireless Group Liabilities, regardless of when or where such Additional Wireless
Group Liabilities arose or arise, or whether the facts on which they are based
occurred prior to or subsequent to the date hereof, regardless of where or
against whom such Additional Wireless Group Liabilities are asserted or
determined (including any Additional Wireless Group Liabilities arising out of
claims made by Parent's or Wireless's respective directors, officers, employees,
agents, Subsidiaries or Affiliates against any member of the Parent Group or the
Wireless Group) or whether asserted or determined prior to the date hereof, and
regardless of whether arising from or alleged to arise from negligence,
recklessness, violation of law, fraud or misrepresentation by any member of the
Parent Group or the Wireless Group or any of their respective directors,
officers, employees, agents, Subsidiaries or Affiliates.

         (c) Parent agrees from and after the Redemption Date faithfully to
perform and fulfill all the Excluded Liabilities in accordance with their
respective terms and to assume obligations to defend Actions which constitute
Excluded Liabilities. From and after such date, Parent shall be responsible for
all Excluded Liabilities, regardless of when or where such Excluded Liabilities
arose or arise, or whether the facts on which they are based occurred prior to
or subsequent to the date hereof, regardless of where or against whom such
Excluded Liabilities are asserted or determined (including any Excluded
Liabilities arising out of claims made by Parent's or Wireless's respective
directors, officers, employees, agents, Subsidiaries or Affiliates against any
member of the Parent Group or the Wireless Group) or whether asserted or
determined prior to the date hereof, and regardless of whether arising from or
alleged to arise from negligence, recklessness, violation of law, fraud or
misrepresentation by any member of the Parent Group or the Wireless Group or any
of their respective directors, officers, employees, agents, Subsidiaries or
Affiliates.

         (d) Each of the parties hereto agrees that the Delayed Transfer Assets
will be assigned, transferred, conveyed and delivered in accordance with the
terms of this Agreement or the applicable Ancillary Agreement. Following such
assignment, transfer, conveyance and delivery of any Delayed Transfer Asset, the
applicable Delayed Transfer Asset shall be treated

                                      -19-
<PAGE>   25
for all purposes of this Agreement and the Ancillary Agreements as an Additional
Wireless Group Asset.

         (e) In the event that at any time or from time to time (whether prior
to or after the Redemption Date), any party hereto (or any member of such
party's respective Group) shall receive or otherwise possess any Asset that is
allocable to any other Person pursuant to this Agreement or any Ancillary
Agreement, such party shall promptly transfer, or cause to be transferred, such
Asset to the Person so entitled thereto. Prior to any such transfer, the Person
receiving or possessing such Asset shall hold such Asset in trust for any such
other Person. For purposes hereof, all Assets that are not Wireless Group Assets
or Additional Wireless Group Assets shall be deemed allocated to the Parent
Group. Without limiting the foregoing, but subject to Section 2.7(a), Wireless
agrees to take such action as may be necessary to transfer to Parent any Parent
Assets or any other Assets that are not Wireless Group Assets or Additional
Wireless Group Assets held by any member of the Wireless Group, whether prior
to, at or after the Redemption Date. Notwithstanding the foregoing, for purposes
of clarification, the parties agree that any Assets acquired by the Wireless
Group after the Distribution Date shall not be Parent Assets.

         2.2. Termination of Agreements. (a) Except as set forth in Section
2.2(b), Wireless and each member of the Wireless Group, on the one hand, and
each of Parent and the members of the Parent Group, on the other hand, hereby
terminate, any and all agreements, arrangements, commitments or understandings,
whether or not in writing, between or among Wireless and/or any member of the
Wireless Group, on the one hand, and Parent and/or any member of the Parent
Group, on the other hand, effective as of the Redemption Date. No such
terminated agreement, arrangement, commitment or understanding (including any
provision thereof which purports to survive termination) shall be of any further
force or effect after the Redemption Date. Each party shall, at the reasonable
request of any other party, take, or cause to be taken, such other actions as
may be necessary to effect the foregoing.

         (b) The provisions of Section 2.2(a) shall not apply to any of the
following agreements, arrangements, commitments or understandings (or to any of
the provisions thereof): (i) this Agreement and the Ancillary Agreements (and
each other agreement or instrument expressly contemplated by this Agreement or
any Ancillary Agreement to be entered into by any of the parties hereto or any
of the members of their respective Groups, including Section 2.3) or any
Wireless Group Liability or Additional Wireless Group Liability; (ii) any
agreements, arrangements, commitments or understandings listed or described on
Schedule 2.2(b)(ii); (iii) any agreements, arrangements, commitments or
understandings to which any Person other than

                                      -20-
<PAGE>   26
the parties hereto and their respective wholly owned Affiliates is a party (it
being understood that to the extent that the rights and obligations of the
parties and the members of their respective Groups under any such agreements,
arrangements, commitments or understandings constitute Additional Wireless Group
Assets or Additional Wireless Group Liabilities, they shall be assigned pursuant
to Section 2.1); (iv) any intercompany accounts payable or accounts receivable
accrued as of the Redemption Date that are reflected in the books and records of
the parties or otherwise documented in writing in accordance with past
practices; (v) any agreements, arrangements, commitments or understandings to
which any non-wholly owned Subsidiary or Affiliate of Parent or Wireless, as the
case may be, is a party (it being understood that directors' qualifying shares
or similar interests will be disregarded for purposes of determining whether a
Subsidiary is wholly owned); (vi) any written Tax sharing or Tax allocation
agreements to which any member of any Group is a party; (vii) any Liability that
ARIC may have under any ARIC Wireless Policy (unless a novation shall have been
effected in accordance with the provisions of this Agreement) and (viii) any
other agreements, arrangements, commitments or understandings that this
Agreement or any Ancillary Agreement expressly contemplates will survive the
Redemption Date.

         2.3. Documents Relating to Transfer of Real Property Interests and
Tangible Property Located Thereon. (a) In furtherance of the assignment,
transfer and conveyance of Additional Wireless Group Assets and the assumption
of Additional Wireless Group Liabilities set forth in Section 2.1(a), (b) and
(c), on or prior to the Redemption Date, each of Parent and Wireless or their
applicable Subsidiaries, will execute and deliver such deeds, lease assignments
and assumptions, leases, subleases and sub-subleases as may be necessary to
effect the transactions contemplated by this Agreement, including this Section
2.3 (collectively, the "Real Property Instruments"). For the locations set forth
on Schedules 2.3(b), 2.3(c) and 2.3(d), the Real Property Instruments will be
substantially in the forms attached as Schedule 2.3(a), with such changes as may
be necessary to conform to any regulations or usage applicable in the
jurisdiction in which the real property is located.

         (b) Schedule 2.3(b) sets forth a list of locations which are currently
owned or leased by a member of the Parent Group and occupied by employees of the
Wireless Group and of the Parent Group. Such Schedule also indicates for each
such location whether such location is owned or leased by a member of the Parent
Group, the approximate square footage, the method that will be used to calculate
rent and the term of the lease or sublease. On or prior to the Redemption Date,
the parties will enter into leases or subleases substantially in the forms set
forth in Schedule 2.3(a) to give effect to the foregoing.

                                      -21-
<PAGE>   27
         (c) Schedule 2.3(c) also sets forth a list of locations which are
currently occupied exclusively by employees of the Wireless Group but which are
owned or leased by a member of the Parent Group. On or prior to the Redemption
Date, (i) in the case of any such property leased or subleased by a member of
the Parent Group, the appropriate member of the Parent Group will assign the
applicable lease or sublease to Wireless and Wireless will assume such lease or
sublease, in each case effective as of the Redemption Date pursuant to an
assignment and assumption agreement substantially in the form set forth in
Schedule 2.3(a), and (ii) in the case of any such property owned by a member of
the Parent Group, the parties will enter into leases or subleases to give effect
to the applicable provisions of Schedule 2.3(c) substantially in the form set
forth in Schedule 2.3(a).

         (d) Schedule 2.3(d) sets forth a list of locations which are currently
owned or leased by a member of the Wireless Group and occupied by employees of
the Wireless Group and of the Parent Group. Such Schedule also indicates for
each such location whether such location is owned or leased by a member of the
Wireless Group and the approximate square footage, the method that will be used
to calculate rent and the term of the lease or sublease. On or prior to the
Redemption Date, the parties will enter into leases or subleases to give effect
to the foregoing substantially in the form set forth in Schedule 2.3(a).

         (e) In addition, each of the members of the Wireless Group and the
Parent Group locates cell site towers or other equipment on properties leased or
owned by the other Group. To the extent practicable without breaching any third
party arrangements, on or prior to the Redemption Date, the parties agree to
enter into mutually acceptable market-based lease or sublease agreements
permitting the continued location of such towers or other equipment for such
periods as the parties may reasonably determine. In no event shall the right of
any member of any Group to lease or sublease any such space for any such cell
site tower or other equipment terminate on less than six months notice.

         (f) Except as otherwise expressly provided in this Agreement or any
Ancillary Agreement, all tenant improvements, fixtures, furniture, office
equipment (other than as set forth in Section 2.3(g)), artwork and other
tangible property (other than equipment subject to capital or operating
equipment leases, which will be transferred or retained based on whether the
associated capital or operating equipment lease is or is not an Additional
Wireless Group Asset) located as of the date hereof on any real property that is
owned by or leased in the name of the Wireless Group (including by assignment of
lease pursuant to Section 2.3(c)) shall, except to the extent expressly set
forth on a Schedule referred to in Section 2.1(a), also be transferred.

                                      -22-
<PAGE>   28
         2.4. Documents Relating to Other Transfers of Assets and Assumption of
Liabilities. In furtherance of the assignment, transfer and conveyance of
Additional Wireless Group Assets and the Wireless Common Stock and the
assumption of Additional Wireless Group Liabilities set forth in Section 2.1(a),
(b) and (c), simultaneously with the execution and delivery hereof or as
promptly as practicable thereafter, (i) Parent shall execute and deliver, and
shall cause its Subsidiaries to execute and deliver, such bills of sale, stock
powers, certificates of title, assignments of contracts and other instruments of
transfer, conveyance and assignment as and to the extent necessary to evidence
the transfer, conveyance and assignment of all of Parent's and its respective
Subsidiaries' right, title and interest in and to the Additional Wireless Group
Assets to Wireless and (ii) Wireless shall execute and deliver, to Parent and
its Subsidiaries such bills of sale, stock powers, certificates of title,
assumptions of contracts and other instruments of assumption as and to the
extent necessary to evidence the valid and effective assumption of the
Additional Wireless Group Liabilities by Wireless.

         2.5. Ancillary Agreements. On or prior to the Redemption Date, each of
Parent and Wireless will execute and deliver all Ancillary Agreements to which
it is a party. The parties hereto acknowledge that the Ancillary Agreements will
contain provisions providing for modifications in the event of a Change of
Control. Each party further agrees that in the event such party undergoes a
Change of Control (without giving effect to the requirement of such definition
that a Change of Control involve a Covered Person), this Agreement and each
Ancillary Agreement will be binding upon and inure to the benefit of each other
Person involved in such Change of Control (without giving effect to the
requirement of such definition that a Change of Control involve a Covered
Person) that is thereafter an Affiliate of such party if and to the same extent
that such party itself may thereafter bound. Except to the extent provided
herein or in any Ancillary Agreement, each party further agrees that in the
event such party distributes all or a portion of its interest in any business to
its shareholders or engages in any similar transaction involving its
shareholders, this Agreement and each Ancillary Agreement will be binding upon
and inure to the benefit of each such distributed or other Person if and to the
same extent that such party itself may thereafter bound. Each party shall be
responsible for the failure of any such Affiliate to comply with any of the
foregoing. In addition, the parties agree to negotiate in good faith an
agreement for the provision of wireless service to the Parent Group.

         2.6. Disclaimer of Representations and Warranties. Each of Parent (on
behalf of itself and each member of the Parent Group) and Wireless (each on
behalf of itself and each member of the Wireless Group) understands and agrees
that, except as expressly set forth herein or in any Ancillary Agreement, no
party to this Agreement, any Ancillary Agreement or any other agreement or
document contemplated by this Agreement, any Ancillary Agreement or

                                      -23-
<PAGE>   29
otherwise, is representing or warranting in any way as to the Assets, businesses
or Liabilities transferred or assumed as contemplated hereby or thereby, as to
any consents or approvals required in connection therewith, as to the value or
freedom from any Security Interests of, or any other matter concerning, any
Assets of such party, or as to the absence of any defenses or right of setoff or
freedom from counterclaim with respect to any claim or other Asset, including
any accounts receivable, of any party, or as to the legal sufficiency of any
assignment, document or instrument delivered hereunder to convey title to any
Asset or thing of value upon the execution, delivery and filing hereof or
thereof. Except as may expressly be set forth herein or in any Ancillary
Agreement, all such Assets are being transferred on an "as is," "where is" basis
(and, in the case of any real property, by means of a quitclaim or similar form
deed or conveyance) and the respective transferees shall bear the economic and
legal risks that any conveyance shall prove to be insufficient to vest in the
transferee good and marketable title, free and clear of any Security Interest.

         2.7. Governmental Approvals and Consents. (a) If and to the extent that
the valid, complete and perfected transfer or assignment (or novation of any
federal government contract) to the Wireless Group of any Additional Wireless
Group Assets (or from the Wireless Group of any Non-Wireless Group Assets) would
be a violation of applicable laws or require any Consent or Governmental
Approval in connection with the Separation or the Distribution, then, unless
Parent and Wireless shall otherwise determine, the transfer or assignment to or
from Wireless of such Additional Wireless Group Assets or Non-Wireless Group
Assets, respectively, shall be automatically deemed deferred and any such
purported transfer or assignment shall be null and void until such time as all
legal impediments are removed and/or such Consents or Governmental Approvals
have been obtained. Notwithstanding the foregoing, any Asset allocated to the
Wireless Group shall be deemed an Additional Wireless Group Asset for purposes
of determining whether any Liability is an Additional Wireless Group Liability.

            (b) If the transfer or assignment of any Assets intended to be
transferred or assigned hereunder is not consummated prior to or at the
Redemption Date, whether as a result of the provisions of Section 2.7(a) or for
any other reason, then the Person retaining such Asset shall thereafter hold
such Asset for the use and benefit, insofar as reasonably possible, of the
Person entitled thereto (at the expense of the Person entitled thereto). In
addition, the Person retaining such Asset shall take such other actions as may
be reasonably requested by the Person to whom such Asset is to be transferred in
order to place such Person, insofar as reasonably possible, in the same position
as if such Asset had been transferred as contemplated hereby and so that all the
benefits and burdens relating to such Additional Wireless Group Assets (or such
Non-Wireless Group Assets, as the case may be), including possession, use, risk
of loss,

                                      -24-
<PAGE>   30
potential for gain, and dominion, control and command over such Assets, are to
inure from and after the Redemption Date to the Wireless Group (or the Parent
Group, as the case may be). To the extent permitted by law and to the extent
otherwise permissible in light of any required Consent and/or Governmental
Approval, the Wireless Group shall be entitled to, and shall be responsible for,
the management and of any Additional Wireless Group Asset not yet transferred to
it as a result of this Section and the parties agree to use reasonable
commercial efforts to cooperate and coordinate with respect thereto.

         (c) If and when the Consents and/or Governmental Approvals, the absence
of which caused the deferral of transfer of any Asset pursuant to Section
2.7(a), are obtained, the transfer of the applicable Asset shall be effected in
accordance with the terms of this Agreement and/or the applicable Ancillary
Agreement.

         (d) The Person retaining an Asset due to the deferral of the transfer
of such Asset shall not be obligated, in connection with the foregoing, to
expend any money unless the necessary funds are advanced by the Person entitled
to the Asset, other than reasonable out-of-pocket expenses, attorneys' fees and
recording or similar fees, all of which shall be promptly reimbursed by the
Person entitled to such Asset.

         2.8. Novation of Additional and Other Wireless Group Liabilities. (a)
Each of Parent, on the one hand, and Wireless, on the other hand, at the request
of the other, shall use its reasonable best efforts to obtain, or to cause to be
obtained, any consent, substitution, approval or amendment required to novate
(including with respect to any federal government contract) or assign all
obligations under agreements, leases, licenses and other obligations or
Liabilities of any nature whatsoever that constitute Additional Wireless Group
Liabilities or Wireless Group Liabilities, or to obtain in writing the
unconditional release of all parties to such arrangements other than any member
of the Wireless Group, so that, in any such case, Wireless and its Subsidiaries
will be solely responsible for such Liabilities; provided, however, that neither
Parent nor Wireless shall be obligated to pay any consideration therefor to any
Governmental Authority or third party from whom such consents, approvals,
substitutions and amendments are requested.

         (b) If Parent and Wireless are unable to obtain, or to cause to be
obtained, any such required consent, approval, release, substitution or
amendment, the applicable member of the Parent Group shall continue to be bound
by such agreements, leases, licenses and other obligations to the extent
required by the terms thereof and, unless not permitted by law, Wireless shall,
as agent or subcontractor for Parent or such other Person, as the case may be,
pay, perform and discharge fully all the obligations or other Liabilities of
Parent or such other Person, as the case may be, thereunder from and after the
Redemption Date. Wireless shall indemnify each

                                      -25-
<PAGE>   31
Parent Indemnitee, and hold each of them harmless against any Liabilities
arising in connection therewith except that Wireless shall not be obligated to
indemnify any Parent Indemnitee solely as a result of any failure to effect any
substitution or amendment in any Action to which Parent is a party. Parent
shall, without further consideration, pay and remit, or cause to be paid or
remitted, to Wireless promptly all money, rights and other consideration
received by it or any member of its respective Group in respect of such
performance (unless any such consideration is an Excluded Asset). If and when
any such consent, approval, release, substitution or amendment shall be obtained
or such agreement, lease, license or other rights or obligations shall otherwise
become assignable or able to be novated, Parent shall thereafter assign, or
cause to be assigned, all its rights, obligations and other Liabilities
thereunder or any rights or obligations of any member of the Parent Group to
Wireless without payment of further consideration and Wireless shall, without
the payment of any further consideration, assume such rights and obligations.

         2.9. Satisfaction of Intercompany Debt and Preferred Stock. On or prior
to the Redemption Date, (a) Wireless shall pay to Parent, or to one or more
other members of the Parent Group designated by Parent, the full amount of the
principal and accrued but unpaid interest, and the face value and accrued but
unpaid dividends, of any intercompany debt owed to any member of the Parent
Group and preferred stock obligations held by any member of the Parent Group and
(b) Parent shall pay to Wireless, or to one or more other members of the
Wireless Group designated by Wireless, the full amount of the principal and
accrued but unpaid interest of any intercompany debt owed to any member of the
Wireless Group. In addition, within 45 days following the Redemption Date,
Parent shall inform Wireless of the cashless (UNO) intercompany net
receivable/payable balance reflected on the financial records of Parent at the
time of the Redemption Date. The party with a net payable (credit) balance shall
pay by wire transfer such amount to an account specified by the party with a net
receivable (debit) balance within 15 days after notice is given.

         2.10. Joint Purchasing Arrangements (a) In the case of existing
purchasing agreements that prior to the Redemption Date provide the members of
the Wireless Group and the Parent Group with volume discounts, the parties agree
to use their respective reasonable best efforts so that to the extent permitted
under the terms of such existing agreements, after the Redemption Date, the
members of each Group shall continue to be able to make purchases and obtain the
benefits of the volume discounts. In the case of any other such contracts, the
parties will cooperate reasonably in seeking modifications to such contracts or
alternative or substitute arrangements so that to the extent practicable after
the Redemption Date, the members of each Group shall continue to be able to make
purchases and obtain the benefits of the volume discounts. Notwithstanding the
foregoing, but subject to the terms of any Wireless Group

                                      -26-
<PAGE>   32
Contract, no member of any Group shall be required to commit to any additional
purchases or other obligations, make any payments or waive any rights in order
to effect the foregoing. Each party hereby agrees to indemnify and hold harmless
the other with respect to any losses or claims arising from such first party's
own purchases, commitments or other obligations under any such contracts.

            (b) Until December 31, 2003, the parties will use reasonable
commercial efforts to cooperate with each other and as applicable with the other
Covered Subsidiaries to coordinate and combine their purchases in cases where
they purchase common supplies or use the same supplier, in each case to the
extent permitted by law from time to time. It is the intent of the parties that
this coordination and cooperation will be focused on achieving more favorable
pricing and terms for such supplies and from such suppliers by aggregating the
combined purchases of the parties. Notwithstanding the foregoing, no party shall
be obligated to make any specific purchases or to use any specific supplier
unless (a) it has previously committed to make a specific purchase or to use a
specific supplier, or (b) subsequent to the date of this Agreement it makes a
commitment for a specific purchase or to use a specific supplier. Each party
will be responsible for its own commitments and its own purchases and other
obligations made under any common or shared contracts with suppliers and will
indemnify and hold harmless the other party and, if applicable, other Covered
Subsidiaries that use such contracts.

         2.11. Certain Additional Transactions (a) Effective as of the
Redemption Date, Wireless agrees to pay or cause to be paid the amounts set
forth on Schedule 1.3(e) in respect of certain Additional Wireless Group Assets
listed thereon to the extent not theretofore paid.

         (b) Parent Group will pay to the Wireless Group 50 percent of any
amount received by Parent Group under the Letter Agreement between AT&T Froghall
Holdings LLC ("AT&T Froghall") and Tadpole B.V., dated April 27, 2001, relating
to dividends from Japan Telecom Co., Ltd. ("JT") (the "Dividend Letter"). For
the avoidance of doubt, the consolidated federal income tax liability, any
combined, consolidated or unitary state, local or foreign tax liability, and any
tax credit, resulting from the sale by AT&T Nederland JT Holdings B.V. of a 10
percent interest in JT, the April 27, 2001 distribution by Froghall B.V. to AT&T
Froghall, the payment of Dutch dividend withholding tax, the transfer of shares
of Froghall B.V. from AT&T Froghall to Froghall B.V., or any payment received
under the Dividend Letter shall be allocated under the Tax Sharing Agreement.
Each of Parent, on the one hand, and Wireless Group on the other hand, agrees to
be responsible for 50 percent of the amount of any obligation of the Parent
Group pursuant to the Letter Agreement among Parent, AT&T Froghall and Froghall
B.V., dated April 27, 2001 relating to tax indemnification (the "First
Indemnification Letter"), the Dividend

                                      -27-
<PAGE>   33
Letter, or the Letter Agreement among Parent, AT&T Froghall, Froghall B.V. and
British Telecommunications plc, dated May 14, 2001, relating to tax
indemnification (the "Second Indemnification Letter") as the case may be, as
well as 50 percent of the reasonable costs of defense (excluding costs of
in-house counsel and other personnel) incurred with respect thereto. Parent
shall promptly notify Wireless Group of any claim against Parent Group under the
First Indemnification Letter, the Second Indemnification Letter or the Dividend
Letter, but the failure to give such notice shall not relieve any member of the
Wireless Group from liability hereunder. Parent shall be entitled to control any
proceeding with respect to a claim under the First Indemnification Letter, the
Second Indemnification Letter or the Dividend Letter, except that Wireless Group
shall be entitled to participate in such proceedings at its sole expense (which
expense shall not be included in the calculations pursuant to this Section) and
its consent (such consent not be unreasonably withheld) shall be obtained in
decisions regarding settlement of any claim under the First Indemnification
Letter, the Second Indemnification Letter or the Dividend Letter. Wireless Group
hereby covenants to make payments to Parent required hereunder promptly after
such obligation arises.

         (c) Subject to the terms and conditions of this Section, each of
Parent, on the one hand, and Wireless Group on the other hand, agrees to be
responsible for 50% of the reasonable costs of defense (excluding costs of
in-house counsel and other personnel) of the Malaysian Action, and for 50% of
the amount of any judgment or settlement paid by any member of the Wireless
Group in respect of the Malaysian Action. Parent shall reimburse the Wireless
Group for Parent's share of any such expenses paid by the Wireless Group, net of
any tax benefit realized (including state and local taxes) by the Wireless Group
as a result of payment by the Wireless Group of Parent's share of such expenses.
For this purpose, the tax benefit realized by the Wireless Group shall be
determined as follows: within 45 days after the end of each quarter ending after
the Distribution Date, Wireless shall notify Parent if the Wireless Group has
realized a tax benefit (through reduction of estimated payments, receipt of a
refund, or otherwise), determined on a with and without basis, as a result of
payment by the Wireless Group of Parent's share of such expenses, until such
time as the Wireless Group has realized a tax benefit for the full amount of
such expenses.. Anything in this Section 2.11(c) to the contrary
notwithstanding, to the extent that the Wireless Group is permitted in
accordance with Section 6A(a) of the Tax Sharing Agreement to carry back a loss
arising after the Distribution Date to a taxable period ending on or before the
Distribution Date, such loss (and any resulting refund) shall be considered to
be attributable to the payment by the Wireless Group of Parent's share of such
expenses to the extent the Wireless Group did not previously recognize a tax
benefit with respect to such expenses. The Wireless Group shall promptly pay the
amount of any tax benefit realized, as determined hereunder, to Parent. If
Parent and the Wireless Group are unable to reach

                                      -28-
<PAGE>   34
agreement on whether a tax benefit was realized by the Wireless Group as a
result of payment by the Wireless Group of Parent's share of such expenses, as
determined under this Section 2.11(c), such disagreement shall be resolved by a
nationally recognized law firm or accounting firm ("Independent Third Party"),
selected in a manner similar to the procedure set forth in Section 9(e)(i) of
the Amended and Restated Tax Sharing Agreement, whose judgment shall be
conclusive and binding upon the parties. The cost of any Independent Third Party
shall be shared equally between the parties. In each case, Wireless Group shall
provide Parent with reasonable documentation with respect thereto, and Wireless
Group shall keep Parent reasonably appraised of the status of the Malaysian
Action. Wireless Group shall assume and be entitled to control the defense
and/or settlement of the Malaysian Action, except that Parent shall be entitled
to participate in the defense at its sole expense (which expense shall not be
included in the calculations pursuant to this Section) and shall be entitled to
participate and its consent shall be obtained in decisions regarding settlement
of the Malaysian Action if Parent would be required to pay some portion of the
settlement. To the extent that at any time on or after the Redemption Date,
Wireless Group (a) directly or indirectly receives any dividends or
distributions in respect of any of its direct or indirect interest in the
Malaysian Wireless Assets, or (b) directly or indirectly recognizes a gain (as
determined under United States generally accepted accounting principles) by
selling or otherwise disposing of all or any portion of its direct or indirect
interest in the Malaysian Wireless Assets (amounts identified in (a) and (b)
collectively referred to as "Malaysian Asset Proceeds"), Parent shall be
entitled to receive 50% of such Malaysian Asset Proceeds, net of any taxes paid
by the Wireless Group as a result of the receipt by the Wireless Group of
Parent's share of such proceeds, provided, that, the cumulative amount to which
Parent is entitled hereunder shall not exceed the amounts paid or payable by
Parent for costs of defense, judgment or settlement with respect to the
Malaysian Action as set forth herein (it being agreed that if any Malaysian
Asset Proceeds are received by the Wireless Group prior to the payment by Parent
of any such costs of defense, judgment or settlement, the amount otherwise
payable by Parent for such costs shall be reduced by 50% of the amount of such
Malaysian Asset Proceeds, net of any taxes paid by the Wireless Group as a
result of the receipt by the Wireless Group of Parent's share of such proceeds).
Wireless Group shall give Parent prompt notice of any transaction or event
giving rise to any Malaysian Asset Proceeds, which notice shall include copies
of all applicable documentation with respect thereto, including with respect to
all ancillary or other side arrangements but the failure to give any such notice
shall not relieve any member of the Wireless Group or Parent from any liability
hereunder. Wireless Group and Parent each hereby covenant to make payments
required hereunder promptly after such obligation arises under the terms set
forth above. For all tax purposes, the parties hereto agree to treat, and to
cause their respective affiliates to treat, (i) any payment between Parent and
the Wireless Group required by this subparagraph (c) as either a contribution by
Parent to Wireless or a distribution

                                      -29-
<PAGE>   35
by Wireless to Parent, as the case may be, occurring immediately prior to the
Distribution and (ii) any payment by a member of the Wireless Group of the
expenses described in the first sentence of this subparagraph (c) as deductible;
provided, that, in the event it is determined as a result of a determination (as
defined in Section 1313 of the Code) that any such treatment is not permissible,
the payment between Parent and the Wireless Group shall be adjusted to place the
parties in the same after-tax position they would have enjoyed absent such
determination.

         2.12. Intellectual Property Matters Notwithstanding anything in this
Agreement or any Ancillary Agreement to the contrary, no rights, title,
interest, or license in, to or under any intellectual property (including Parent
Group IPR, Wireless Group IPR, and third party and other patents, copyrights,
trademarks, service marks, mask works, proprietary information, trade secrets,
and know-how, as well as any applications or registrations therefor) are
granted, made, assigned, extended, shared or otherwise conveyed in any way,
except to the extent expressly provided in the Intellectual Property Agreement
(the "Intellectual Property Agreement"), the Trademark and Service Mark
Assignment (the "Trademark Assignment") and the Brand License Agreement (the
"Brand License Agreement"), each dated as of the date hereof, by and between
Parent and Wireless. To the extent that this Agreement or any Ancillary
Agreement contains provisions which purport to cover or address any matter
addressed in the Intellectual Property Agreement, the Trademark Assignment or
the Brand License Agreement, the Intellectual Property Agreement, the Trademark
Assignment and the Brand License Agreement, respectively, shall prevail.

         2.13. Wireless Constituent Documents Prior to the Mandatory Exchange,
Wireless and Parent will take such action necessary to amend the certificate of
incorporation and by-laws of Wireless substantially in the form set forth in
Schedule 2.13 hereto. It is also expected that as of or after the Distribution
Wireless will adopt a preferred share purchase rights plan.

                                  ARTICLE III

           ACTIONS PENDING THE MANDATORY EXCHANGE AND THE DISTRIBUTION

         3.1. Transactions Prior to the Mandatory Exchange and the Distribution.
(a) Parent and Wireless shall take such efforts regarding the Registration
Statements, including the prospectuses included therein, and any amendments or
supplements thereto, as are reasonably necessary to effect the transactions
contemplated hereby. Parent and Wireless shall also cooperate in preparing,
filing with the Commission and causing to become effective any registration
statements or amendments thereof that are required to reflect the establishment
of, or

                                      -30-
<PAGE>   36
amendments to, any employee benefit and other plans necessary or appropriate in
connection with the Separation Transactions and the other transactions
contemplated by this Agreement or the Ancillary Agreements.

            (b) Wireless shall use its reasonable best efforts to take all such
action as may be necessary or appropriate under state securities and blue sky
laws of the United States (any comparable laws under any foreign jurisdictions)
in connection with the Separation Transactions and the other transactions
contemplated by this Agreement or the Ancillary Agreements.

         (c) Parent and Wireless shall cooperate in the preparation of, and
shall file and use reasonable best efforts to seek to make effective, an
application for listing of the Wireless Common Stock to be issued in the
Mandatory Exchange and the Distribution on the NYSE or the Nasdaq NMS, subject
to official notice of issuance.

         (d) Parent and Wireless will effect an appropriate split or other
recapitalization of the Wireless Common Stock.. In the event that the number of
shares of Wireless Common Stock distributed in the Mandatory Exchange for each
share of Parent Wireless Group Common Stock outstanding on the Record Date does
not equal one, the provisions of this Agreement shall be appropriately adjusted.

         3.2. Additional Distribution On or prior to the Redemption Date, Parent
may elect to effect one or more Additional Distributions, at such times, in such
manner (whether by exchange offer, dividend or otherwise) and in such amounts as
Parent in its sole discretion may decide.

                                   ARTICLE IV

                             THE MANDATORY EXCHANGE

         4.1. The Mandatory Exchange. (a) Subject to Section 4.3 hereof, on or
prior to the Redemption Date, Parent will deliver to the Agent, for the benefit
of holders of record of Parent Wireless Group Common Stock on the Record Date, a
single stock certificate endorsed by Parent in blank representing (or authorize
the related book-entry transfer of) a number of shares of Wireless Common Stock
equal to the number of issued and outstanding shares of Parent Wireless Group
Common Stock on the Record Date, and shall cause the transfer agent for the
shares of Parent Wireless Group Common Stock to instruct the Agent, from and
after the Redemption Date, to deliver in exchange for such shares (or book-entry
transfer authorizations

                                      -31-
<PAGE>   37
of) of Parent Wireless Group Common Stock the appropriate number of shares of
Wireless Common Stock to each such holder or designated transferee or
transferees of such holder.

         (b) Subject to Section 4.4, each holder of Parent Wireless Group Common
Stock on the Record Date (or such holder's designated transferee or transferees)
will be entitled to receive in redemption of such holder's shares of Parent
Wireless Group Common Stock a number of shares of Wireless Common Stock equal to
the number of shares of Parent Wireless Group Common Stock held by such holder
on the Record Date.

         (c) Wireless and Parent, as the case may be, will provide to the Agent
all share certificates and any information required in order to complete the
Mandatory Exchange on the basis specified above.

         4.2. Actions Prior to the Mandatory Exchange. (a) Parent and Wireless
shall prepare and mail, prior to the Redemption Date, to the holders of Parent
Wireless Group Common Stock, a notice of redemption and such information
concerning Wireless and its business, operations and management, the Mandatory
Exchange, Distribution and such other matters as Parent shall reasonably
determine and as may be required by the Parent Charter, law or the applicable
rules and regulations of the Commission and the NYSE. Parent and Wireless will
prepare, and Wireless will, to the extent required under applicable law, file
with the Commission any such documentation and any requisite no action letters
which Parent determines are necessary or desirable to effectuate the Mandatory
Exchange and Parent and Wireless shall each use their respective reasonable best
efforts to obtain all necessary approvals from the Commission with respect
thereto as soon as practicable.

         (b) Parent and Wireless shall take all such action as Parent may
determine necessary or appropriate under the securities or blue sky laws of the
United States (and any comparable laws under any foreign jurisdiction) in
connection with the Mandatory Exchange.

         4.3. Conditions to the Mandatory Exchange. The Parent Board shall have
the sole discretion to determine the date of consummation of the Mandatory
Exchange and whether to consummate the Mandatory Exchange. The Parent Board
currently intends to effect the Mandatory Exchange as soon as practical
following the satisfaction or the waiver by Parent of the conditions set forth
below:

                  (a) The transfers of the Additional Wireless Group Assets, and
         the assignments and assumptions to and by Wireless of the Additional
         Wireless Group Liabilities, shall have been effected such that Wireless
         shall be both a "Qualifying Subsidiary" and a

                                      -32-
<PAGE>   38
         "Wireless Group Subsidiary" as such terms are defined in the Parent
         Charter, and there shall be no other circumstance that would prevent
         the Mandatory Exchange from being made in accordance with the terms of
         the Parent Charter;

                  (b) The Registration Statement relating to shares of Wireless
         Common Stock shall have been filed and declared effective by the
         Commission, and there shall be no stop-order in effect with respect
         thereto;

                  (c) The actions and filings with regard to state securities
         and blue sky laws of the United States (and any comparable laws under
         any foreign jurisdictions) described in Section 3.1 shall have been
         taken and, where applicable, become effective or been accepted;

                  (d) Any material Governmental Approvals and Consents necessary
         to consummate the Mandatory Exchange or the Distribution in the manner
         contemplated by this Agreement shall have been obtained and be in full
         force and effect;

                  (e) The Wireless Common Stock to be issued in the Mandatory
         Exchange and the Distribution shall have been accepted for listing on
         the NYSE or the Nasdaq NMS, subject to official notice of issuance;

                  (f) All conditions to permit the Distribution to qualify as a
         tax-free distribution to Parent, Wireless and Parent's shareholders
         shall, to the extent applicable as of the time of the Mandatory
         Exchange, be satisfied and there shall be no event or condition that is
         likely to cause any of such conditions not to be satisfied as of the
         time of the Mandatory Exchange or thereafter;

                  (g) No order, injunction or decree issued by any court or
         agency of competent jurisdiction or other legal restraint or
         prohibition preventing the consummation of the Separation, the
         Mandatory Exchange or the Distribution or any of the other transactions
         contemplated by this Agreement or any Ancillary Agreement shall be in
         effect;

                  (h) This Agreement shall not have been terminated; and

                  (i) A private letter ruling from the Internal Revenue Service
         shall have been obtained, and shall continue in effect, to the effect
         that no gain or loss will be recognized by Parent, Wireless or Parent's
         or Wireless' shareholders for federal income tax purposes (including
         the holders of Parent Wireless Group Common Stock) by virtue of
         Sections

                                      -33-
<PAGE>   39
         361(c) and 368(a)(1)(D) as a result of (i) the Mandatory Exchange and
         the Distribution, (ii) the transfer to Wireless of the Additional
         Wireless Assets, (iii) the assumption by Wireless of the Additional
         Wireless Group Liabilities, and (iv) the distribution of proceeds in
         respect of the intercompany debt and preferred stock, and such ruling
         shall be in form and substance satisfactory to Parent.

The foregoing conditions are for the sole benefit of Parent and shall not give
rise to or create any duty on the part of Parent or the Parent Board of
Directors to waive or not waive any such condition.

         4.4. Fractional Shares. As soon as practicable after the Redemption
Date, Parent shall direct the Agent to determine the number of whole shares and
fractional shares of Wireless Common Stock allocable to each holder of record or
beneficial owner of Parent Wireless Group Common Stock as of the Record Date, to
aggregate all such fractional shares and sell the whole shares obtained thereby
at the direction of Parent either to Parent, in open market transactions or
otherwise, in each case at then prevailing trading prices, and to cause to be
distributed to each such holder or for the benefit of each such beneficial
owner, in lieu of any fractional share, such holder's or owner's ratable share
of the proceeds of such sale, after making appropriate deductions of the amount
required to be withheld for federal income tax purposes and after deducting an
amount equal to all brokerage charges, commissions and transfer taxes attributed
to such sale. Parent and the Agent shall use their reasonable best efforts to
aggregate the shares of Parent Wireless Group Common Stock that may be held by
any beneficial owner thereof through more than one account in determining the
fractional share allocable to such beneficial owner.

                                   ARTICLE V

                                THE DISTRIBUTION

         5.1. The Distribution. (a) In consideration of all the liabilities and
obligations assumed by Wireless in the Employee Benefits Agreement, dated as of
the date hereof, by and between Parent and Wireless, including without
limitation the provisions of Section 5.3 of the Employee Benefits Agreement,
Parent agrees that the denominator of the Wireless Group Allocation Fraction (as
defined in the Charter) shall be reduced, effective as of immediately prior to
the Distribution Date, by 12,577,650. Subject to Section 5.3 hereof, on or prior
to the Distribution Date, Parent will deliver to the Agent, for the benefit of
holders of record of Parent Common Stock on the Record Date, a single stock
certificate endorsed by Parent in blank, representing (or authorize the related
book-entry transfer of) all of the outstanding shares of

                                      -34-
<PAGE>   40
Wireless Common Stock then owned by Parent or any member of the Parent Group
(after giving effect to the Mandatory Exchange), and shall cause the transfer
agent for the shares of Parent Common Stock to instruct the Agent to distribute
on the Distribution Date the appropriate number of such shares (or book-entry
transfer authorizations) of Wireless Common Stock to each such holder or
designated transferee or transferees of such holder.

         (a) Subject to Section 5.4, each holder of Parent Common Stock on the
Record Date (or such holder's designated transferee or transferees) will be
entitled to receive in the Distribution a number of shares of Wireless Common
Stock equal to the number of shares of Parent Common Stock held by such holder
on the Record Date multiplied by a fraction the numerator of which shall be (1)
the denominator of the Wireless Group Allocation Fraction on the Record Date
(which for purposes of clarification shall include shares of Parent Wireless
Group Common Stock issuable upon conversion of the Parent Wireless Group
Preferred Stock) minus (2) the sum of (w) the number of shares of Parent
Wireless Group Common Stock outstanding on the Record Date, (x) 12,577,650
(without duplication of any adjustment contemplated by Section 5.1(a)), (y) the
number (to the nearest whole number) obtained by dividing $3 billion by the
closing share price of the Parent Wireless Group Common Stock on The New York
Stock Exchange on June 15, 2001 (without giving effect to any extended hours
trading) and (z) the number of shares of Parent Wireless Group Common Stock into
which the shares of Parent Wireless Group Preferred Stock outstanding on the
Record Date are convertible), and the denominator of which shall be the number
of shares of Parent Common Stock outstanding on the Record Date. All
calculations pursuant to this Section shall be made as of the close of business
on the Record Date.

         (c) Wireless and Parent, as the case may be, will provide to the Agent
all share certificates and any information reasonably required in order to
complete the Distribution on the basis specified above.

         5.2. Actions Prior to the Distribution. (a) Parent and Wireless shall
prepare and mail, prior to the Distribution Date, to the holders of Parent
Common Stock as of the Record Date, such information concerning Wireless and its
business, operations and management, the Distribution and such other matters as
Parent shall reasonably determine and as may be required by law. Parent and
Wireless will prepare, and Wireless will, to the extent required under
applicable law, file with the Commission any such documentation which Parent
determines are necessary or desirable to effectuate the Distribution and Parent
and Wireless shall each use their respective reasonable best efforts to obtain
all necessary approvals from the Commission with respect thereto as soon as
practicable.

                                      -35-
<PAGE>   41
          (b) Parent and Wireless shall take all such action as Parent may
determine necessary or appropriate under the securities or blue sky laws of the
United States (and any comparable laws under any foreign jurisdiction) in
connection with the Distribution.

          5.3. Conditions to Distribution. Parent shall effect the Distribution
concurrently with the Mandatory Exchange, subject to the satisfaction or the
waiver by Parent of the other conditions set forth below:

               (a) the Mandatory Exchange shall occur concurrently in accordance
          with the terms of this Agreement;

               (b) a private letter ruling from the Internal Revenue Service
          shall have been obtained, and shall continue in effect, to the effect
          set forth in Section 4.3(i) hereof;

               (c) any material Governmental Approvals and Consents necessary to
          consummate the Distribution in the manner contemplated by this
          Agreement shall have been obtained and be in full force and effect;
          and

               (d) no order, injunction or decree issued by any court or agency
          of competent jurisdiction or other legal restraint or prohibition
          preventing the consummation of the Distribution shall be in effect and
          no other event outside the control of Parent shall have occurred or
          failed to occur that prevents the consummation of the Distribution.

The foregoing conditions are for the sole benefit of Parent and shall not give
rise to or create any duty on the part of Parent or the Parent Board of
Directors to waive or not waive any such condition.

          5.4. Fractional Shares. As soon as practicable after the Distribution
Date, Parent shall direct the Agent to determine the number of whole  shares
and fractional shares of Wireless Common Stock allocable to  each holder of
record or beneficial owner of Parent Common Stock as of the  Record Date, to
aggregate all such fractional shares and sell the whole shares obtained thereby
at the direction of Parent either to Parent, in open market transactions or
otherwise, in each case at then prevailing trading prices, and to cause to be
distributed to each such holder or for the benefit of each such beneficial
owner, in lieu of any fractional share, such holder's or owner's ratable share
of the proceeds of such sale, after making appropriate deductions of the amount
required to be withheld for federal income tax purposes and after deducting an
amount equal to all brokerage charges, commissions and transfer taxes
attributed to such sale. Parent and the Agent shall use their reasonable best
efforts to aggregate the shares of

                                      -36-
<PAGE>   42
Parent Common Stock that may be held by any beneficial owner thereof through
more than one account in determining the fractional share allocable to such
beneficial owner.

                                   ARTICLE VI

                        MUTUAL RELEASES; INDEMNIFICATION

          6.1. Release of Pre-Closing Claims. (a) Except as provided in Section
6.1(c), effective as of the Redemption Date, Wireless does hereby, for itself
and each other wholly owned member of the Wireless Group, their respective
successors and assigns, and all Persons who at any time prior to the Redemption
Date have been shareholders, directors, officers, agents or employees of any
wholly owned member of the Wireless Group (in each case, in their respective
capacities as such), remise, release and forever discharge each of Parent, the
wholly owned members of the Parent Group, their respective successors and
assigns, and all Persons who at any time prior to the Redemption Date have been
shareholders, directors, officers, agents or employees of Parent or any wholly
owned member of the Parent Group (in each case, in their respective capacities
as such), and their respective heirs, executors, administrators, successors and
assigns, from any and all Liabilities whatsoever, whether at law or in equity
(including any right of contribution), whether arising under any contract or
agreement, by operation of law or otherwise, existing or arising from any acts
or events occurring or failing to occur or alleged to have occurred or to have
failed to occur or any conditions existing or alleged to have existed on or
before the Redemption Date, including in connection with the transactions and
all other activities to implement any of the Separation, the Mandatory Exchange
and the Distribution.

          (b) Except as provided in Section 6.1(c), effective as of the
Redemption Date, Parent does hereby, for itself and each other wholly owned
member of the Parent Group, their respective successors and assigns, and all
Persons who at any time prior to the Redemption Date have been shareholders,
directors, officers, agents or employees of any wholly owned member of the
Parent Group (in each case, in their respective capacities as such), remise,
release and forever discharge Wireless, the wholly owned members of the Wireless
Group, their successors and assigns, and all Persons who at any time prior to
the Redemption Date have been shareholders, directors, officers, agents or
employees of Wireless or any wholly owned member of the Wireless Group (in each
case, in their respective capacities as such), and their respective heirs,
executors, administrators, successors and assigns, from any and all Liabilities
whatsoever, whether at law or in equity (including any right of contribution),
whether arising under any contract or agreement, by operation of law or
otherwise, existing or arising from any acts or events occurring or failing to
occur or alleged to have occurred or to have failed to occur or any

                                      -37-
<PAGE>   43
conditions existing or alleged to have existed on or before the Redemption Date,
including in connection with the transactions and all other activities to
implement any of the Separation, the Mandatory Exchange and the Distribution.

               (c) Nothing contained in Section 6.1(a) or (b) shall impair any
right of any Person to enforce this Agreement, any Ancillary Agreement or any
agreements, arrangements, commitments or understandings that are specified in
Section 2.2(b) or the applicable Schedules thereto, in each case in accordance
with its terms. Nothing contained in Section 6.1(a) or (b) shall release any
Person from:

                              (i) any Liability provided in or resulting from
               any agreements, arrangements, commitments or understandings among
               any members of the Parent Group or the Wireless Group that is
               specified in Section 2.2(b) or the applicable Schedules thereto,
               any other Liability specified in such Section 2.2(b), or any
               other Liability that survives the Redemption Date;

                              (ii) any Liability, contingent or otherwise,
               assumed, transferred, assigned or allocated to the Group of which
               such Person is a member in accordance with, or any other
               Liability of any member of any Group under, this Agreement or any
               Ancillary Agreement;

                              (iii) any Liability for the sale, lease,
               construction or receipt of goods, property or services purchased,
               obtained or used in the ordinary course of business by a member
               of one Group from a member of any other Group prior to the
               Redemption Date;

                              (iv) any Liability for unpaid amounts for products
               or services or refunds owing on products or services due on a
               value-received basis for work done by a member of one Group at
               the request or on behalf of a member of another Group;

                              (v) any Liability that the parties may have with
               respect to indemnification or contribution pursuant to this
               Agreement for claims brought against the parties by third
               Persons, which Liability shall be governed by the provisions of
               this Article VI and, if applicable, the appropriate provisions of
               the Ancillary Agreements;

                              (vi) any Liability the release of which would
               result in the release of any Person other than a Person released
               pursuant to this Section 6.1; provided that the parties agree not
               to bring suit or permit any of their Subsidiaries to bring suit
               against any Person with

                                      -38-
<PAGE>   44
               respect to any Liability to the extent that such Person would be
               released with respect to such Liability by this Section 6.1 but
               for the provisions of this clause (vi); or

                              (vii) any Liability that ARIC may have under any
               ARIC Wireless Policy (unless a novation shall have been effected
               in accordance with the provisions of this Agreement).

               (d) Except for claims against ARIC under any ARIC Wireless Policy
(unless a novation shall have been effected in accordance with the provisions of
this Agreement), Wireless shall not make, and shall not permit any member of the
Wireless Group to make, any claim or demand, or commence any Action asserting
any claim or demand, including any claim of contribution or any indemnification,
against Parent or any member of the Parent Group, or any other Person released
pursuant to Section 6.1(a), with respect to any Liabilities released pursuant to
Section 6.1(a). Parent shall not, and shall not permit any member of the Parent
Group, to make any claim or demand, or commence any Action asserting any claim
or demand, including any claim of contribution or any indemnification, against
Wireless or any member of the Wireless Group, or any other Person released
pursuant to Section 6.1(b), with respect to any Liabilities released pursuant to
Section 6.1(b).

               (e) At any time, at the request of any other party, each party
shall cause each member of its respective Group to execute and deliver releases
reflecting the provisions of this Section 6.1.

               6.2. Indemnification by Wireless. Except as provided in Section
6.4, Wireless shall indemnify, defend and hold harmless Parent, each member of
the Parent Group and each of their respective directors, officers and employees,
and each of the heirs, executors, successors and assigns of any of the foregoing
(collectively, the "Parent Indemnitees"), from and against any and all
Liabilities of the Parent Indemnitees relating to, arising out of or resulting
from any of the following items regardless of whether arising from or alleged to
arise from negligence, recklessness, violation of law, fraud or
misrepresentation (without duplication):

               (a) the failure of Wireless or any other member of
the Wireless Group or any other Person to pay, perform or otherwise promptly
discharge any Wireless Group Liabilities, any Additional Wireless Group
Liabilities or any Wireless Group Contract in accordance with their respective
terms, whether prior to or after the Redemption Date or the date hereof;

                                      -39-
<PAGE>   45
                              (b) the Wireless Group, any Wireless Group
               Liability, any Additional Wireless Group Liability, any Wireless
               Group Asset, any Additional Wireless Group Asset or any Wireless
               Group Contract; and

                              (c) any breach by Wireless or any member of the
               Wireless Group of this Agreement or any of the Ancillary
               Agreements.

                              (d) any untrue statement or alleged untrue
               statement of a material fact or omission or alleged omission to
               state a material fact required to be stated therein or necessary
               to make the statements therein not misleading, in any case to the
               extent relating to the Wireless Group contained in any
               Registration Statement or other document or in any registration
               statement or other document relating to the exchange offer
               commenced in connection with the Additional Distribution (it
               being agreed that all Liabilities relating to, arising out of, or
               resulting from the consummation of the Separation Transactions
               shall be allocated pursuant to Section 1.4(j) and not this
               clause).

               6.3. Indemnification by Parent. Parent shall indemnify, defend
and hold harmless Wireless, each member of the Wireless Group and each of their
respective directors, officers and employees, and each of the heirs, executors,
successors and assigns of any of the foregoing (collectively, the "Wireless
Indemnitees"), from and against any and all Liabilities of the Wireless
Indemnitees relating to, arising out of or resulting from any of the following
items regardless of whether arising from or alleged to arise from negligence,
recklessness, violation of law, fraud or misrepresentation (without
duplication):

               (a) the failure of Parent or any other member of the Parent Group
or any other Person to pay, perform or otherwise promptly discharge any
Liabilities of the Parent Group (including all Excluded Liabilities) other than
the Wireless Group Liabilities or Additional Wireless Group Liabilities, whether
prior to or after the Redemption Date or the date hereof;

               (b) any Liability of the Parent Group other than the Wireless
Group Liabilities and Additional Wireless Group Liabilities;

               (c) any breach by Parent or any member of the Parent Group of
this Agreement or any of the Ancillary Agreements; and

               (d) except to the extent contemplated by Section 6.2(d), any
untrue statement or alleged untrue statement of a material fact or omission or
alleged omission to state a material fact required to be stated therein or
necessary to make the statements therein not misleading

                                      -40-
<PAGE>   46
contained in any Registration Statement or other document utilized in connection
with the Separation Transactions or in any registration statement or other
document relating to the exchange offer commenced in connection with the
Additional Distribution (it being agreed that all Liabilities relating to,
arising out of, or resulting from the consummation of the Separation
Transactions shall be allocated pursuant to Section 1.4(j) and not this clause).

               6.4. Indemnification Obligations Net of Insurance Proceeds and
Other Amounts. (a) The parties intend that any Liability subject to
indemnification or reimbursement pursuant to this Article VI will be net of
Insurance Proceeds. Accordingly, the amount which any party (an "Indemnifying
Party") is required to pay to any Person entitled to indemnification hereunder
(an "Indemnitee") will be reduced by any Insurance Proceeds theretofore actually
recovered by or on behalf of the Indemnitee in reduction of the related
Liability. If an Indemnitee receives a payment (an "Indemnity Payment") required
by this Agreement from an Indemnifying Party in respect of any Liability and
subsequently receives Insurance Proceeds, then the Indemnitee will pay to the
Indemnifying Party an amount equal to the excess of the Indemnity Payment
received over the amount of the Indemnity Payment that would have been due if
the Insurance Proceeds had been received, realized or recovered before the
Indemnity Payment was made.

               (b) An insurer who would otherwise be obligated to pay any claim
shall not be relieved of the responsibility with respect thereto or, solely by
virtue of the indemnification provisions hereof, have any subrogation rights
with respect thereto, it being expressly understood and agreed that no insurer
or any other third party shall be entitled to a "windfall" (i.e., a benefit it
would not be entitled to receive in the absence of the indemnification
provisions) by virtue of the indemnification provisions hereof.

               (c) With respect to all policies of insurance other than ARIC
Wireless Policies, the parties agree to act in good faith and to use their
reasonable best efforts to preserve and maximize the insurance benefits due to
be provided thereunder and to cooperate with one another as necessary to permit
each other to access or obtain the benefits under those policies, provided
however that nothing in this Section shall be construed to prevent any party or
any other Person from asserting claims for insurance benefits or accepting
insurance benefits provided by the policies (including the ARIC Wireless
Policies). The parties agree to negotiate in good faith with respect to
procedures that will apply after the Redemption Date for claims under the ARIC
Wireless Policies (it being agreed that such procedures shall neither increase
nor decrease the rights of any Person in respect thereof). The parties agree to
exchange information upon reasonable request of the other party regarding
requests that they have made for insurance benefits, notices of claims,
occurrences and circumstances that they have submitted to the

                                      -41-
<PAGE>   47
insurance companies or other entities managing the policies, payments they have
received from the insurance companies, including any agreements to make
payments, and any other information that the parties may need to determine the
status of the insurance policies and the continued availability of benefits
thereunder.

               (d) Other than in the case of ARIC Wireless Insurance Policies,
(1) each party agrees to use its reasonable best efforts to collect any
Insurance Proceeds that may be applicable to any Third Party Claim or other
claim that could give rise to a right of indemnification hereunder (it being
agreed that any costs of collection shall be indemnifiable hereunder to the same
extent as the underlying Third Party Claim or other claim); (2) without limiting
the foregoing, the parties agree to cooperate in connection with the submission
of any claims and, to the extent permitted under the applicable policy or other
agreement, to permit the Indemnifying Party to pursue claims against the
applicable insurance company or other Person and (3) the provisions of this
Section 6.4(d) shall apply to any Insurance Proceeds that may be applicable to
the costs of defense as well as to any ultimate Liability.

               (e) Any Insurance Proceeds recovered at any time shall be applied
in the manner set forth in Section 6.4(a).

               6.5. Procedures for Indemnification of Third Party Claims. (a) If
an Indemnitee shall receive notice or otherwise learn of the assertion by a
Person (including any Governmental Authority) who is not a member of the Parent
Group or the Wireless Group of any claim or of the commencement by any such
Person of any Action (collectively, a "Third Party Claim") with respect to which
an Indemnifying Party may be obligated to provide indemnification to such
Indemnitee pursuant to Section 6.2 or 6.3, or any other Section of this
Agreement or any Ancillary Agreement, such Indemnitee shall give such
Indemnifying Party and, if Parent is not the Indemnifying Party, Parent written
notice thereof within 20 days after receiving notice of such Third Party Claim.
Any such notice shall describe the Third Party Claim in reasonable detail.
Notwithstanding the foregoing, the failure of any Indemnitee or other Person to
give notice as provided in this Section 6.5(a) shall not relieve the related
Indemnifying Party of its obligations under this Article VI, except to the
extent that such Indemnifying Party is actually prejudiced by such failure to
give notice.

               (b) An Indemnifying Party may elect to defend (and, unless the
Indemnifying Party has specified any reservations or exceptions, to seek to
settle or compromise), at such Indemnifying Party's own expense and by such
Indemnifying Party's own counsel, any Third Party Claim. Within 30 days after
the receipt of notice from an Indemnitee in accordance with Section 6.5(a) (or
sooner, if the nature of such Third Party Claim so requires), the Indemnifying

                                      -42-
<PAGE>   48
Party shall notify the Indemnitee of its election whether the Indemnifying Party
will assume responsibility for defending such Third Party Claim, which election
shall specify any reservations or exceptions. After notice from an Indemnifying
Party to an Indemnitee of its election to assume the defense of a Third Party
Claim, such Indemnitee shall have the right to employ separate counsel and to
participate in (but not control) the defense, compromise, or settlement thereof,
but the fees and expenses of such counsel shall be the expense of such
Indemnitee except as set forth in the next sentence. The Indemnifying Party
shall not have the right to admit Liability on behalf of the Indemnitee and
shall not compromise or settle a Third Party Claim to the extent the compromise
or settlement could prejudice the interests of the Indemnitee, without the
express prior consent of the Indemnitee. In the event that the Indemnifying
Party has elected to assume the defense of the Third Party Claim but has
specified, and continues to assert, any reservations or exceptions in such
notice, then, in any such case, the reasonable fees and expenses of one separate
counsel for all Indemnitees shall be borne by the Indemnifying Party.

               (c) If an Indemnifying Party elects not to assume responsibility
for defending a Third Party Claim, or fails to notify an Indemnitee of its
election as provided in Section 6.5(b), such Indemnitee may defend such Third
Party Claim at the cost and expense of the Indemnifying Party.

               (d) Unless the Indemnifying Party has failed to assume the
defense of the Third Party Claim in accordance with the terms of this Agreement,
no Indemnitee may settle or compromise any Third Party Claim without the consent
of the Indemnifying Party.

               (e) No Indemnifying Party shall consent to entry of any judgment
or enter into any settlement of the Third Party Claim without the consent of the
Indemnitee (which shall not be unreasonably withheld) if the effect thereof is
to permit any injunction, declaratory judgment, other order or other
non-monetary relief to be entered, directly or indirectly, against any
Indemnitee.

               (f) The provisions of Section 6.5 and Section 6.6 shall not apply
to Taxes (which are covered by the Tax Sharing Agreement) or to the matters
covered by Sections 7.2 and 7.3 hereof.

               (g) The parties may enter into one or more additional agreements
providing for procedures and other matters relating to the handling of Actions
and related matters which shall be deemed Ancillary Agreements for purposes
hereof.

                                      -43-

<PAGE>   49
               6.6. Additional Matters. (a) Any claim on account of a Liability
that does not result from a Third Party Claim shall be asserted by written
notice given by the Indemnitee to the related Indemnifying Party. Such
Indemnifying Party shall have a period of 30 days after the receipt of such
notice within which to respond thereto. If such Indemnifying Party does not
respond within such 30-day period, such Indemnifying Party shall be deemed to
have refused to accept responsibility to make payment. If such Indemnifying
Party does not respond within such 30-day period or rejects such claim in whole
or in part, such Indemnitee shall be free to pursue such remedies as may be
available to such party as contemplated by this Agreement and the Ancillary
Agreements.

               (b) In the event of payment by or on behalf of any Indemnifying
Party to any Indemnitee in connection with any Third Party Claim, such
Indemnifying Party shall be subrogated to and shall stand in the place of such
Indemnitee as to any events or circumstances in respect of which such Indemnitee
may have any right, defense or claim relating to such Third Party Claim against
any claimant or plaintiff asserting such Third Party Claim or against any other
person. Such Indemnitee shall cooperate with such Indemnifying Party in a
reasonable manner, and at the cost and expense of such Indemnifying Party, in
prosecuting any subrogated right, defense or claim.

               (c) In the event of an Action in which the Indemnifying Party is
not a named defendant, if either the Indemnified Party or Indemnifying Party
shall so request, the parties shall endeavor to substitute the Indemnifying
Party for the named defendant, if at all practicable. If such substitution or
addition cannot be achieved for any reason or is not requested, the named
defendant shall allow the Indemnifying Party to manage the Action as set forth
in this Section.

               6.7. Remedies Cumulative. The remedies provided in this Article
VI shall be cumulative and shall not preclude assertion by any Indemnitee of any
other rights or the seeking of any and all other remedies against any
Indemnifying Party.

               6.8. Survival of Indemnities. The rights and obligations of each
of Parent and Wireless and their respective Indemnitees under this Article VI
shall survive the sale or other transfer by any party of any Assets or
businesses or the assignment by it of any Liabilities.

               6.9. Combined Service Claims; Similar Matters The parties agree
to use reasonable efforts to cooperate with respect to the defense of any
Combined Service Claims and any other Action or threatened Action involving or
alleged to involve Liabilities of each of the Wireless Group and the Parent
Group so that to the maximum extent practicable each Group

                                      -44-

<PAGE>   50
shall be entitled to control the defense of any Action to the extent it
represents a Liability of such Group.

               6.10. Specified Matters In order to facilitate the defense of any
Specified Matters, the parties agree that (a) each of Parent and Wireless shall
be responsible for its own costs of defense of any Specified Matters, regardless
of the outcome thereof, (b) the parties shall cooperate in the defense thereof,
and (c) Parent shall be entitled to control the defense thereof although
Wireless shall be equally entitled to participate in the defense thereof with
counsel of its own selection to the extent it may have any Liability therefor;
provided, however, that after the Distribution Date neither Parent nor Wireless
may settle all or any portion of any such Action or engage in settlement
negotiations unless such party has obtained the prior written consent of the
other party (which consent shall not be unreasonably withheld) or unless any
remaining Liability of the other party, the other party's affiliates and their
respective officers and directors will be fully released as a result of such
settlement. In the event of any conflict with Section 6.5 hereof, in the case of
any Specified Matters, the provisions of this Section shall control.

               6.11. IPR Exception Sections 6.2 and 6.3 hereof shall not be
construed to create an indemnification obligation for infringement of third
party patents to the extent that such obligation would be based on a grant of
patent license rights under the Intellectual Property Agreement.

                                  ARTICLE VII

                       INSURANCE AND CERTAIN OTHER MATTERS

               7.1. Insurance Matters (a) Except as may otherwise be provided in
any Ancillary Agreement, the parties intend that to the extent permitted under
the terms of any applicable policy, Wireless and each other member of the
Wireless Group shall be successors-in-interest to all rights that any member of
the Wireless Group may have as of the Redemption Date as a subsidiary,
affiliate, division or department of Parent prior to the Redemption Date under
any policy of insurance issued to Parent by any insurance carrier (whether or
not affiliated with Parent) or under any agreements related to such policies
executed and delivered prior to the Redemption Date, including any rights such
member of the Wireless Group may have, as an insured or additional named
insured, subsidiary, affiliate, division or department, to avail itself of any
such policy of insurance or any such agreements related to such policies as in
effect prior to the Redemption Date. Notwithstanding the foregoing, Wireless
acknowledges that as of the Redemption Date, Parent intends to amend each such
insurance policy to remove the members of the Wireless Group and their
respective employees, officers and directors as insured parties

                                      -45-

<PAGE>   51
thereunder in respect of periods from and after the Redemption Date and that
none of the foregoing may be entitled to make any claims for insurance
thereunder either to the extent such claims are based upon conduct or injury or
other events occurring from and after the Redemption Date or to the extent such
claims are precluded by the terms of any "claims made" policies. Except for the
limitations contemplated by the preceding sentence and except as otherwise arise
pursuant to Section 7.1(b), the provisions of this Agreement are not intended to
relieve any insurer of any Liability under any policy. No member of the Parent
Group shall be deemed to have made any representation or warranty as to the
availability of any such insurance policy. Wireless on behalf of itself and each
member of the Wireless Group agrees that no member of the Parent Group other
than ARIC will have any Liability in respect of any ARIC Policy.

               (b) Notwithstanding anything in any ARIC Wireless Policy to
the contrary, ARIC shall be entitled to assign any ARIC Wireless Policy on
identical terms and conditions to any reputable insurance company and/or to
effect a novation of any ARIC Wireless Policy upon assignment to and assumption
by any reputable insurance company with an A.M. Best's rating of at least A/10.
Wireless agrees to cooperate fully, and to cause each member of the Wireless
Group to cooperate fully, with Parent and ARIC in connection with the foregoing,
including by providing or causing to be provided any information requested by
insurers or reinsurers in connection with any such proposed assignment,
assumption or novation. Prior to assigning any ARIC Wireless Policy to a third
party, Wireless shall have the option (which must be exercised in writing within
thirty days after receiving written notice from Parent (which notice from Parent
shall contain a description of the terms of the proposed assignment and of the
proposed new policy and the identity of the proposed assignee)) to have such
policy and the obligations thereunder assigned to Wireless for the cost AT&T
would incur in assigning such policy to a third party.

               (c) Parent agrees to obtain Directors and Officers, Outside
Directors and Officers, and Fiduciary Liability run-off insurance from third
party commercial insurers in dollar amounts equal to those amounts maintained by
Parent for all its insureds (including but not limited to Wireless) as of the
Redemption Date (it being agreed that insureds of Parent other than Wireless
shall also continue to be able to claim under such policies). Coverage under
these policies shall apply to all insureds of Parent and its Subsidiaries for
claims that are reported subsequent to the Redemption Date and that relate to
acts that occurred during the period from September 30, 1996 until the
Redemption Date. Such policies shall remain in force for a period of six years
following the Redemption Date.

                                      -46-

<PAGE>   52
               (d) Subject to Section 7.1(c) relating to run off policies and
except for claims against ARIC under the ARIC Wireless Policies (unless a
novation shall have been effected in accordance with the provisions of this
Agreement), in no event shall Parent, any other member of the Parent Group or
any Parent Indemnitee have liability or obligation whatsoever to any member of
the Wireless Group in the event that any insurance policy or other contract of
insurance shall be terminated or otherwise cease to be in effect for any reason,
shall be unavailable or inadequate to cover any Liability of any member of the
Wireless Group for any reason whatsoever or shall not be renewed or extended
beyond the current expiration date.

               (e) This Agreement shall not be considered as an attempted
assignment of any policy of insurance or as a contract of insurance and shall
not be construed to waive any right or remedy of any member of the Parent Group
in respect of any insurance policy or any other contract of insurance.

               (f) Subject to Section 7.1(c) relating to run off policies and
except for claims against ARIC under the ARIC Wireless Policies (unless a
novation shall have been effected in accordance with the provisions of this
Agreement), Wireless does hereby, for itself and each other member of the
Wireless Group, agree that no member of the Parent Group or any Parent
Indemnitee shall have any Liability whatsoever as a result of the insurance
policies and practices of Parent and its Affiliates as in effect at any time
prior to the Redemption Date, including as a result of the level or scope of any
such insurance, the creditworthiness of any insurance carrier, the terms and
conditions of any policy, the adequacy or timeliness of any notice to any
insurance carrier with respect to any claim or potential claim or otherwise.

               (g) Nothing in this Agreement shall be deemed to restrict any
member of the Wireless Group from acquiring at its own expense any other
insurance policy in respect of any Liabilities or covering any period.

               7.2. Certain Post-Distribution Transactions and Related Matters

               (a) Wireless agrees that, until thirty months after the date of
the Distribution, it will (i) maintain its status as a company engaged in the
active conduct of a trade or business and (ii) not engage in any transaction
that would result in it ceasing to be a company engaged in the active conduct of
a trade or business, as defined in Section 355(b) of the Code.

               (b) Wireless further agrees that, until thirty months after the
date of the Distribution, it will not (i) enter into any Proposed Acquisition
Transaction or, to the extent Wireless has the right to prohibit any Proposed
Acquisition Transaction, permit any Proposed

                                      -47-

<PAGE>   53
Acquisition Transaction to occur (whether by (a) redeeming rights under a
stockholders rights plan, (b) finding a tender offer to be a "permitted offer"
under any such plan or otherwise causing any such plan to be inapplicable or
neutralized with respect to any Proposed Acquisition Transaction, or (c)
approving any Proposed Acquisition Transaction, whether for purposes of Section
203 of the DGCL or any similar corporate statute, any "fair price" or other
provision of Wireless' charter or bylaws or otherwise), (ii) liquidate or
partially liquidate, (iii) in a single transaction or series of related
transactions sell or transfer all or substantially all of the assets of the
Wireless Group that were transferred to Wireless prior to the Distribution, (iv)
redeem or otherwise repurchase (directly or through a Wireless Affiliate) any
Wireless stock, (v) enter into any transaction or series of transactions as a
result of which any Person would acquire, or have the right to acquire, from
Wireless or an Affiliate, a number of shares of Wireless stock that would
comprise more than 5% of (A) the value of all outstanding shares of Wireless
stock as of the date of such transaction, or in the case of a series of
transactions, the date of the last transaction of such series, or (B) the voting
power of the issued and outstanding shares of Wireless stock as of the date of
such transaction, or in the case of a series of transactions, the date of the
last transaction of such series or (vi) take any other action or actions
(including any action or transaction that would be reasonably likely to be
inconsistent with any representation made in the Tax Opinions/Rulings) which in
the aggregate (and taking into account any other transactions described in this
subparagraph (b)) would be reasonably likely to have the effect of causing or
permitting one or more persons to acquire directly or indirectly stock
representing a 50 percent or greater interest (within the meaning of Section
355(e) of the Code) in Wireless or otherwise jeopardize the non-recognition of
taxable gain or loss for U.S. federal income tax purposes to Parent, Parent
Affiliates and Parent's stockholders in connection with the Separation
Transactions, unless prior to taking any such action set forth in the foregoing
clauses (i) through (vi), Parent has determined, in its sole and absolute
discretion, which discretion shall be exercised in good faith solely to preserve
the tax-free status of the Separation Transactions, that such action or actions
would not result in (A) the Separation Transactions failing to qualify under the
provisions of Sections 355, 361(c) and 368(a)(1)(D) of the Code or (B) the
Wireless shares failing to qualify as "qualified property" for purposes of
Section 355(c)(2) or 361(c) of the Code by reason of Section 355(e) of the Code
(each of (A) and (B) referred to hereafter as a "Spin-Off Disqualification").
"Proposed Acquisition Transaction" means a transaction or series of transactions
as a result of which Wireless would merge or consolidate with any other person
or pursuant to which any Person or any group of related Persons would acquire,
or have the right to acquire, directly or indirectly, from one or more holders
of outstanding shares of Wireless stock, a number of shares of Wireless stock
that would comprise more than 5% of (A) the value of all outstanding shares of
Wireless stock as of the date of such transaction, or in the case of a series of
transactions, the date of the last transaction of such series, or (B) the voting
power of the

                                      -48-

<PAGE>   54
issued and outstanding shares of Wireless stock as of the date of such
transaction, or in the case of a series of transactions, the date of the last
transaction of such series.

               (c) If Wireless notifies Parent that it desires to take one of
the actions described in clauses (i) through (vi) of Section 7.2(b) (the
"Notified Action") and Parent concludes that such Notified Action would risk
Spin-Off Disqualification, Parent, in its reasonable discretion, shall, at the
request of Wireless, elect to either (i) use all commercially reasonable efforts
to obtain a Subsequent Tax Opinion/Ruling that would permit Wireless to take the
Notified Action, and Wireless shall cooperate in connection with such efforts,
or (ii) provide all reasonable cooperation to Wireless in connection with
Wireless obtaining such a Subsequent Tax Opinion/Ruling; provided, however, that
the reasonable costs and expenses of obtaining any such Subsequent Tax
Opinion/Ruling shall be borne by Wireless. "Subsequent Tax Opinion/Ruling" means
either (i) an unqualified opinion of counsel jointly selected by Parent and
Wireless confirming that, as a consequence of the consummation of the Notified
Action, no income, gain or loss for U.S. federal income tax purposes will be
recognized by Parent, the stockholders or former stockholders of Parent, or any
Parent Affiliate with respect to the Separation Transactions or (ii) an IRS
private letter ruling to the same effect, in each case based on representations
of fact (and not of law) that, after reasonable due diligence conducted by
Parent, are in form and substance reasonably satisfactory to Parent.

               (d) Notwithstanding anything to the contrary herein or any
provision of the Tax Sharing Agreement to the contrary, if there is a
determination (as defined in Section 1313 of the Code) that a Spin-Off
Disqualification has occurred, then Wireless shall indemnify and hold harmless
Parent and each member of the consolidated group of which Parent is a member
from and against any and all Tax Related Losses imposed upon or incurred by
Parent, any member of its group or any stockholder of Parent as a result of the
Spin-Off Disqualification. The obligation of Wireless to indemnify Parent
pursuant to the preceding sentence shall not be affected by the delivery of any
Subsequent Tax Opinion/Ruling unless the Spin-Off Disqualification would not
have occurred but for (i) the failure of any representation made by Parent in
paragraph (f) of this Section or with respect to Parent or the Parent Group's
business, and the plans, proposals, intentions and policies of the Parent (but
excluding any representations with respect to the Wireless Group, its
businesses, plans, proposals intentions and policies or the Parent Wireless
Group Common Stock) after the Separation Transactions in connection with a
Subsequent Tax Opinion/Ruling to be true and correct in all material respects or
(ii) a post-spin-off transaction with respect to the stock or assets of Parent.
In the case of (i) or (ii) in the preceding sentence, Wireless shall have no
obligation to indemnify Parent pursuant to this Section 7.2(d). "Tax-Related
Losses" means (i) all federal, state and local Taxes (including

                                      -49-

<PAGE>   55
interest and penalties thereon) imposed pursuant to any settlement, final
determination, judgment or otherwise; (ii) all accounting, legal and other
professional fees, and court costs incurred in connection with such taxes; and
(iii) all costs and expenses that may result from adverse tax consequences to
Parent or Parent's stockholders (including all costs, expenses and damages
associated with stockholder litigation or controversies) payable by Parent or
Parent Affiliates.

               (e) Wireless hereby represents and warrants that (i) it has
examined the Tax Opinions/Rulings and the Representation Letters, and (ii) the
facts presented and the representations made therein, to the extent descriptive
of Wireless or the Wireless Group or the issuance of the Parent Wireless Group
Common Stock (including, without limitation, the business purposes for the
Separation Transactions and the representations in the Representation Letter and
Tax Opinions/Rulings to the extent that they relate to Wireless or the Wireless
Group or the issuance of the Parent Wireless Group Common Stock, and the plans,
proposals, intentions and policies of Wireless), are true, correct and complete
in all material respects. "Representation Letter" means the representation
letter and any other materials (including, without limitation, the ruling
request and the related supplemental submissions to the IRS) delivered or
deliverable by Parent and others in connection with the rendering by tax counsel
and the issuance by the IRS of the Tax Opinions/Rulings, which to the extent
related to Wireless shall be in form and substance reasonably satisfactory to
Wireless. "Tax Opinions/Rulings" means, collectively, the opinions of tax
counsel and the rulings by the IRS deliverable to Parent in connection with the
transactions contemplated by this Agreement.

               (f) Parent hereby represents and warrants that (i) it has
examined the Tax Opinions/Rulings and the Representation Letter, and (ii) the
facts presented and the representations made therein, to the extent descriptive
of Parent or the Parent Group (including Parent's business purposes for the
Separation Transactions, the representations in the Representation Letter and
Tax Opinions/Rulings to the extent that they relate to Parent or the Parent
Group's business, and the plans, proposals, intentions and policies of the
Parent after the Separation Transactions but excluding any representations with
respect to the Wireless Group, its businesses, plans, proposals intentions and
policies or the Parent Wireless Group Common Stock) are correct and complete in
all material respects.

               7.3. Procedure for Indemnification for Tax Liabilities. (a) If
Parent receives notice of the assertion of any claim, suit, arbitration,
inquiry, proceeding or investigation by or before any court, governmental or
other regulatory or administrative agency or commission or any arbitration
tribunal asserted by a Person other than Parent or any Parent Affiliate or
Wireless or any Wireless Affiliate which gives rise to a right of
indemnification hereunder (a "Third-Party

                                      -50-

<PAGE>   56
Tax Claim") with respect to which Wireless may be obligated under Section 7.2(d)
to provide indemnification, Parent shall give Wireless notice thereof (together
with a copy of such Third-Party Tax Claim, process or other legal pleading)
promptly after becoming aware of such Third-Party Tax Claim; provided, however,
that the failure of Parent to give notice as provided in this Section shall not
relieve Wireless of its obligations under Section 7.2(d), except to the extent
that Wireless is actually prejudiced by such failure to give notice. Such notice
shall describe such Third-Party Tax Claim in reasonable detail.

               (b) (i) Notwithstanding any provision to the contrary contained
in the Tax Sharing Agreement, Parent and Wireless shall jointly control the
defense of, and cooperate with each other with respect to defending, any
Third-Party Tax Claim with respect to which Wireless is obligated under Section
7.2(d) to provide indemnification, provided that Wireless shall forfeit such
joint control right with respect to a particular Third-Party Tax Claim if
Wireless or any Wireless Affiliate makes any public statement or filing, or
takes any action (including, but not limited to, the filing of any submission or
pleading, or the giving of a deposition or production of documents, in any
administrative or court proceeding) in connection with such Third-Party Tax
Claim that is inconsistent in a material respect with any representation or
warranty made by Wireless in the Agreement, the Tax Opinions/Rulings, the
Representation Letter or a Subsequent Tax Opinion/Ruling.

               (ii) Wireless and Parent shall exercise their rights to jointly
control the defense of any such Third-Party Tax Claim solely for the purpose of
defeating such Third-Party Tax Claim and, unless required by applicable law,
neither Wireless nor Parent shall make any statements or take any actions that
could reasonably result in the shifting of liability for any Losses arising out
of such Third-Party Tax Claim from the party making such statement or taking
such action (or any of its Affiliates) to the other party (or any of its
Affiliates).

               (iii) Statements made or actions taken by either Wireless or
Parent in connection with the defense of any such Third-Party Tax Claim shall
not prejudice the rights of such party in any subsequent action or proceeding
between the parties.

               (iv) If either Parent or Wireless fails to jointly defend any
such Third-Party Tax Claim, the other party shall solely defend such Third-Party
Tax Claim and the party failing to jointly defend shall use commercially
reasonable efforts to cooperate with the other party in its defense of such
Third-Party Tax Claim; provided, however, that Parent may not compromise or
settle any such Third-Party Tax Claim without the prior written consent of
Wireless, which consent shall not be unreasonably withheld or delayed. All costs
and expenses of either party in connection with, and during the course of, the
joint control of the defense of any such Third-

                                      -51-

<PAGE>   57
Party Tax Claim shall be initially paid by the party that incurs such costs and
expenses. Such costs and expenses shall be reallocated and reimbursed in
accordance with the respective indemnification obligations of the parties at the
conclusion of the defense of such Third-Party Tax Claim.

               (c) (i) If there is a determination that a Spin-Off
Disqualification has occurred, Parent and Wireless shall attempt in good faith
to resolve any disagreement with respect to whether there is an indemnification
obligation pursuant to Section 7.2(d). If the parties cannot agree by the tenth
business day following the determination (the "Dispute Date"), then the
liability shall initially be determined as follows: Within 20 days of the
Dispute Date, Parent and Wireless shall each appoint one arbitrator. The two
arbitrators so appointed shall appoint a third arbitrator within 30 days of the
Dispute Date. If either party shall fail to appoint an arbitrator within such
20-day period, the arbitration shall be conducted by the sole arbitrator
appointed by the other party. Whether selected by Parent, Wireless or otherwise,
each arbitrator selected to resolve such dispute shall be a tax attorney who is
generally recognized in the tax community as a qualified and competent tax
practitioner with experience in the tax area involved in the issue to be
resolved. Such arbitrators shall be empowered to determine initially whether or
not Wireless is required to indemnify Parent pursuant to Section 7.2(d)
hereunder. Each of Parent and Wireless shall bear 50 percent of the aggregate
expenses of the arbitrators (or sole arbitrator). The decision of the
arbitrators shall be rendered no later than 90 days from the Dispute Date.

               (ii) On the tenth business day following the determination that
there has been a Spin-Off Disqualification, if Wireless agrees that it has an
indemnification obligation, Wireless shall pay in full any amount due and
payable to Parent pursuant to Section 7.2(d), together with interest calculated
at the Underpayment Rate from the date of the determination that there was a
Spin-Off Disqualification through the date of payment. If Wireless and Parent
disagree as to whether an indemnity obligation is due, and the arbitration
process concludes that Wireless is liable, Wireless shall pay any amount that
would be due and payable to Parent if Parent were entitled to indemnity pursuant
to Section 7.2(d), together with interest on such amount calculated at the
Underpayment Rate from the date of the determination that there was a Spin-Off
Disqualification through the date of payment. "Underpayment Rate" shall mean the
annual rate of interest described in Section 6621(c) of the Code for large
corporate underpayments of income Tax (or similar provision of state or local
income Tax law, as applicable), as determined from time to time.

               (iii) If pursuant to a final nonappealable order of a court of
competent jurisdiction, it is determined that Wireless has not paid amounts
payable to Parent pursuant to

                                      -52-

<PAGE>   58
Section 7.2(d) or that amounts paid by Wireless to Parent should not have been
paid, Wireless shall pay to Parent the balance due, or Parent shall repay to the
excess amount paid, in either event within five days of the final determination
of liability or overpayment, together with interest at the Underpayment Rate
calculated (i) from the date of the determination that there was a Spin-Off
Disqualification in the case of a payment to be made by Wireless or (ii) from
the date of payment by Wireless to Parent in the case of a repayment to be made
by Parent. All payments pursuant to this Section 7.3(c) shall be made by wire
transfer to the bank account designated by Parent or Wireless, as the case may
be, for such purpose.

                                  ARTICLE VIII

                    EXCHANGE OF INFORMATION; CONFIDENTIALITY

               8.1. Agreement for Exchange of Information. (a) Each of Parent
and Wireless, on behalf of its respective Group, agrees to use its reasonable
best efforts to provide, or cause to be provided, to the other Group, at any
time before or after the Distribution Date, as soon as reasonably practicable
after written request therefor, any Information in the possession or under the
control of such respective Group which the requesting party reasonably needs (i)
to comply with reporting, disclosure, filing or other requirements imposed on
the requesting party (including under applicable securities or tax laws) by a
Governmental Authority having jurisdiction over the requesting party, (ii) for
use in any other judicial, regulatory, administrative, tax or other proceeding
or in order to satisfy audit, accounting, claims, regulatory, litigation, tax or
other similar requirements, or (iii) to comply with its obligations under this
Agreement or any Ancillary Agreement; provided, however, that in the event that
any party determines that any such provision of Information could be
commercially detrimental, violate any law or agreement, or waive any
attorney-client privilege, the parties shall take all reasonable measures to
permit the compliance with such obligations in a manner that avoids any such
harm or consequence. Parent and Wireless intend that any transfer of Information
that would otherwise be within the attorney-client privilege shall not operate
as a waiver of any potentially applicable privilege.

               (b) After the Distribution Date, each of Parent and Wireless
shall provide, or cause to be provided, to the other party, at no charge to the
other party, all financial and other data and information as the other party
determines necessary or advisable in order to prepare its financial statements
and reports or filings with the Securities Exchange Commission.

               (c) The provisions of this Section 8.1 shall not apply to any
Information to the extent it is based on Information created after the
Distribution Date.

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<PAGE>   59
               8.2. Ownership of Information. Any Information owned by one Group
that is provided to a requesting party pursuant to Section 8.1 shall be deemed
to remain the property of the providing party. Unless specifically set forth
herein, nothing contained in this Agreement shall be construed as granting or
conferring rights of license or otherwise in any such Information.

               8.3. Compensation for Providing Information. The party requesting
such Information agrees to reimburse the other party for the reasonable costs,
if any, of creating, gathering and copying such Information, to the extent that
such costs are incurred for the benefit of the requesting party. Except as may
be otherwise specifically provided elsewhere in this Agreement or in any other
agreement between the parties, such costs shall be computed in accordance with
the providing party's standard methodology and procedures.

               8.4. Record Retention. To facilitate the possible exchange of
Information pursuant to this Article VIII and other provisions of this Agreement
after the Distribution Date, the parties agree to use their reasonable best
efforts to retain all Information in their respective possession or control on
the Distribution Date to the extent such retention is required by the policies
of Parent as in effect on the Distribution Date. In addition, no party will
destroy, or permit any of its Subsidiaries to destroy, any Information which the
other party may have the right to obtain pursuant to this Agreement prior to the
third anniversary of the date hereof without first using its reasonable best
efforts to notify the other party of the proposed destruction and giving the
other party the opportunity to take possession of such information prior to such
destruction; provided, however, that in the case of any Information relating to
Taxes or to Environmental Liabilities, such period shall be extended to the
expiration of the applicable statute of limitations (giving effect to any
extensions thereof).

               8.5. Limitation of Liability. No party shall have any liability
to any other party in the event that any Information exchanged or provided
pursuant to this Agreement which is an estimate or forecast, or which is based
on an estimate or forecast, is found to be inaccurate, in the absence of willful
misconduct by the party providing such Information. No party shall have any
liability to any other party if any Information is destroyed after reasonable
best efforts by such party to comply with the provisions of Section 8.4.

               8.6. Other Agreements Providing for Exchange of Information. The
rights and obligations granted under this Article VIII are subject to any
specific limitations, qualifications or additional provisions on the sharing,
exchange or confidential treatment of Information set forth in any Ancillary
Agreement.

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<PAGE>   60
               8.7. Production of Witnesses; Records; Cooperation. (a) After the
Distribution Date, except in the case of an adversarial Action by one party
against another party (which shall be governed by such discovery rules as may be
applicable thereto), each party hereto shall use its reasonable best efforts to
make available to each other party, upon written request, the former, current
and future directors, officers, employees, other personnel and agents of the
members of its respective Group as witnesses and any books, records or other
documents within its control or which it otherwise has the ability to make
available, to the extent that any such person (giving consideration to business
demands of such directors, officers, employees, other personnel and agents) or
books, records or other documents may reasonably be required in connection with
any Action in which the requesting party may from time to time be involved,
regardless of whether such Action is a matter with respect to which
indemnification may be sought hereunder. The requesting party shall bear all
costs and expenses in connection therewith.

               (b) If an Indemnifying Party chooses to defend or to seek to
compromise or settle any Third Party Claim, each other party shall use its
reasonable best efforts to make available, upon written request, the former,
current and future directors, officers, employees, other personnel and agents of
the members of its respective Group as witnesses and any books, records or other
documents within its control or which it otherwise has the ability to make
available, to the extent that any such person (giving consideration to business
demands of such directors, officers, employees, other personnel and agents) or
books, records or other documents may reasonably be required in connection with
such defense, settlement or compromise, or such prosecution, evaluation or
pursuit, as the case may be, and shall otherwise cooperate in such defense,
settlement or compromise, or such prosecution, evaluation or pursuit, as the
case may be.

               (c) Without limiting the foregoing, the parties shall cooperate
and consult to the extent reasonably necessary with respect to any Actions.

               (d) Without limiting any provision of this Section 8.7, each of
the parties agrees to cooperate, and to cause each member of its respective
Group to cooperate, with each other in the defense of any infringement or
similar claim with respect any intellectual property and shall not claim to
acknowledge, or permit any member of its respective Group to claim to
acknowledge, the validity or infringing use of any intellectual property of a
third Person in a manner that would hamper or undermine the defense of such
infringement or similar claim.

               (e) The obligation of the parties to provide witnesses pursuant
to this Section 8.7 is intended to be interpreted in a manner so as to
facilitate cooperation and shall include the

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<PAGE>   61
obligation to provide as witnesses inventors, directors, officers, employees,
other personnel and agents without regard to whether any such individual could
assert a possible business conflict (subject to the exception set forth in the
first sentence of Section 8.7(a)).

               (f) In connection with any matter contemplated by this Section
8.7, the parties will enter into a mutually acceptable joint defense agreement
as necessary in specific Actions or with regard to specific claims so as to
maintain to the extent practicable any applicable attorney-client privilege or
work product immunity of any member of any Group.

               8.8. Confidentiality. (a) Subject to Section 8.9, each of Parent
and Wireless, on behalf of itself and each member of its respective Group,
agrees to hold, and to cause its respective directors, officers, employees,
agents, accountants, counsel and other advisors and representatives to hold, in
strict confidence, with at least the same degree of care that applies to
Parent's confidential and proprietary information pursuant to policies in effect
as of the Distribution Date, all Information concerning each such other Group
that is either in its possession (including Information in its possession prior
to any of the date hereof, the Redemption Date or the Distribution Date) or
furnished by any such other Group or its respective directors, officers,
employees, agents, accountants, counsel and other advisors and representatives
at any time pursuant to this Agreement, any Ancillary Agreement or otherwise,
and shall not use any such Information other than for such purposes as shall be
expressly permitted hereunder or thereunder, except, in each case, to the extent
that such Information has been (i) in the public domain through no fault of such
party or any member of such Group or any of their respective directors,
officers, employees, agents, accountants, counsel and other advisors and
representatives, (ii) later lawfully acquired from other sources by such party
(or any member of such party's Group) which sources are not themselves bound by
a confidentiality obligation), or (iii) independently generated without
reference to any proprietary or confidential Information of the other party.

               (b) Each party agrees not to release or disclose, or permit to be
released or disclosed, any such Information to any other Person, except its
directors, officers, employees, agents, accountants, counsel and other advisors
and representatives who need to know such Information (who shall be advised of
their obligations hereunder with respect to such Information), except in
compliance with Section 8.9. Without limiting the foregoing, when any
Information is no longer needed for the purposes contemplated by this Agreement
or any Ancillary Agreement, each party will promptly after request of the other
party either return to the other party all Information in a tangible form
(including all copies thereof and all notes, extracts or summaries based
thereon) or certify to the other party that it has destroyed such Information

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<PAGE>   62
(and such copies thereof and such notes, extracts or summaries based thereon)
(except that the parties acknowledge it will not be possible to delete or
destroy certain electronically stored information).

               8.9. Protective Arrangements. In the event that any party or any
member of its Group either determines on the advice of its counsel that it is
required to disclose any Information pursuant to applicable law or receives any
demand under lawful process or from any Governmental Authority to disclose or
provide Information of any other party (or any member of any other party's
Group) that is subject to the confidentiality provisions hereof, such party
shall notify the other party prior to disclosing or providing such Information
and shall cooperate at the expense of the requesting party in seeking any
reasonable protective arrangements requested by such other party. Subject to the
foregoing, the Person that received such request may thereafter disclose or
provide Information to the extent required by such law (as so advised by
counsel) or by lawful process or such Governmental Authority.

                                   ARTICLE IX

                   FURTHER ASSURANCES AND ADDITIONAL COVENANTS

               9.1. Further Assurances. (a) In addition to the actions
specifically provided for elsewhere in this Agreement, each of the parties
hereto shall use its reasonable best efforts on and after the Distribution Date,
to take, or cause to be taken, all actions, and to do, or cause to be done, all
things, reasonably necessary, proper or advisable under applicable laws,
regulations and agreements to consummate and make effective the transactions
contemplated by this Agreement and the Ancillary Agreements. Each party shall
appoint one or more individuals to act as its agent and attorney in fact with
full right and power to execute any instruments necessary to transfer any Asset
allocated to any other Person and shall, on or prior to the Distribution Date,
notify the other parties hereto of the identity of any such individual.

               (b) Without limiting the foregoing, prior to, on and after the
Distribution Date, each party hereto shall cooperate with the other parties, and
without any further consideration, but at the expense of the requesting party,
to execute and deliver, or use its reasonable best efforts to cause to be
executed and delivered, all instruments, including instruments of conveyance,
assignment and transfer, and to make all filings with, and to obtain all
consents, approvals or authorizations of, any Governmental Authority or any
other Person under any permit, license, agreement, indenture or other instrument
(including any Consents or Governmental Approvals), and to take all such other
actions as such party may reasonably be requested to take by any other party
hereto from time to time, consistent with the terms of this

                                      -57-

<PAGE>   63
Agreement and the Ancillary Agreements, in order to effectuate the provisions
and purposes of this Agreement and the Ancillary Agreements and the transfers of
the Additional Wireless Assets and the Wireless Common Stock and the assignment
and assumption of the Additional Wireless Liabilities and the other transactions
contemplated hereby and thereby. Without limiting the foregoing, each party
will, at the reasonable request, cost and expense of any other party, take such
other actions as may be reasonably necessary to vest in such other party good
and marketable title, free and clear of any Security Interest, if and to the
extent it is practicable to do so. Notwithstanding the foregoing or anything in
this Agreement or any Ancillary Agreement to the contrary, no member of either
Group shall be required to make any payment, incur or become subject to any
Liability, agree to any restriction, surrender any right or Asset or otherwise
enter into any agreement, or be required to permit to occur any event, that
would be adverse to it in order to obtain any such Consent or Governmental
Approval.

               (c) On or prior to the Redemption Date, Parent and Wireless in
their respective capacities as direct and indirect stockholders of their
respective Subsidiaries, shall each ratify any actions which are reasonably
necessary or desirable to be taken by Parent and Wireless, or any other
Subsidiary of Parent, as the case may be, to effectuate the transactions
contemplated by this Agreement.

               (d) Parent and Wireless, and each of the members of their
respective Groups, waive (and agree not to assert against the other) any claim
or demand that any of them may have against the other for any Liabilities or
other claims relating to or arising out of: (i) the failure of Wireless or any
member of the Wireless Group, on the one hand, or of Parent or any member of the
Parent Group, on the other hand, to provide any notification or disclosure
required under any state Environmental Law in connection with the Separation or
the other transactions contemplated by this Agreement, including the transfer by
any member of any Group to any member of any other Group of ownership or
operational control of any Assets not previously owned or operated by such
transferee; or (ii) any inadequate, incorrect or incomplete notification or
disclosure under any such state Environmental Law by the applicable transferor.
To the extent any Liability to any Governmental Authority or any third Person
arises out of any action or inaction described in clause (i) or (ii) above, the
transferee of the applicable Asset hereby assumes and agrees to pay any such
Liability.

               9.2. Parent Restructuring. Wireless recognizes and agrees, for
itself and on behalf of the members of the Wireless Group, that the Parent Group
contemplates a Restructuring (as defined below) in a series of transactions.
Except as may expressly be provided in any Ancillary Agreement, in connection
with the Restructuring or any part thereof,

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<PAGE>   64
notwithstanding anything herein to the contrary, Parent shall be entitled to
assign all or a portion of its rights and obligations under this Agreement or
any Ancillary Agreement to any other entity resulting from the Restructuring or
any part thereof, provided that at the time of such assignment Parent reasonably
determines that the assignee is operationally and financially capable of
performing the assigned obligations. In each case, the applicable entity or
entities will assume the related obligations set forth in this Agreement or such
Ancillary Agreement, as applicable. In the case of any of the foregoing,
effective upon any such assumption, and without any further action required by
the parties hereto, Parent and the applicable members of the Parent Group shall
automatically be fully released and discharged with respect to the assigned
obligations. Parent will give Wireless written notice of the terms of any
assignment pursuant to this Section at least 10 days prior to the effectiveness
thereof. For purposes hereof, the term "Restructuring" shall mean the various
restructuring plans announced by Parent on October 25, 2000 and thereafter, and
any amendments, modifications or adjustments thereto, whereby generally Parent
would split-off the AT&T Wireless Group from Parent, distribute all the common
stock it holds in Liberty Media Corporation in exchange for all the outstanding
shares of Liberty Media Group tracking stock; fully separate, or issue separate
tracking stocks intended to reflect the financial performance and economic value
of, each of Parent's other major units: AT&T Broadband, AT&T Business Services
and AT&T Consumer Services; and engage in a number of related activities in
connection therewith, including any potential combinations with one or more
third parties involving any of the entities resulting from the foregoing (which
shall be deemed entities resulting from the Restructuring for purposes hereof)
and including any of the deleveraging activities such as the disposition of
AT&T's ownership interests in various cable properties and investments. In the
event that either Parent or Wireless desires to make any other assignment of all
or any portion of its obligations (or the obligations of any member of its
Group) under this Agreement or any Ancillary Agreement, neither party may do so
without the consent of the other, such consent not to be unreasonably withheld.
In any such event, effective upon any such assumption, and without any further
action required by the parties hereto, the applicable assignor and the
applicable members of its Group shall automatically be fully released and
discharged with respect to the assigned obligations.

               9.3. Patent License Agreements. Except as prohibited by any
patent license agreement, Parent will provide to the Wireless Group, prior to
the Redemption Date, complete copies of all patent license agreements between
Parent and a third party (and, if applicable, any other Person) entered into and
in effect prior to the Redemption Date which patent license agreements are in
the possession or control of, and known to, the Parent intellectual property law
group and which (a) grant rights, or covenants not to sue, under any patents
which are either owned by the Wireless Group or which will be assigned to the
Wireless Group under an

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<PAGE>   65
Ancillary Agreement or (b) create Liabilities which result from activities,
operation, or business of the Wireless Group, as conducted any time prior to, on
or after the Redemption Date; provided that, such copies are deemed Parent
Proprietary Information under the Intellectual Property Agreement and, for each
such copy so-provided, the Wireless Group agrees to abide by the stricter of (i)
any confidentiality obligations imposed on Parent by such patent license
agreement and (ii) the confidentiality obligations imposed on Parent Proprietary
Information by the Intellectual Property Agreement. Parent will construe the
provisions of such patent license agreements which concern whether Parent can
provide copies of such patent license agreements to the Wireless Group as
reasonably favorable to the Wireless Group's receiving such copies as the terms
of the patent license agreements will allow, as judged by Parent in its
discretion exercised in good faith, without Parent having to assume liability or
causing a breach of contract. In construing such provisions, Parent shall deem
Wireless a wholly owned subsidiary of Parent prior to the Redemption Date.

                                   ARTICLE X

                                   TERMINATION

               10.1. Termination. This Agreement may be terminated at any time
prior to the Distribution Date by Parent in its sole discretion.

               10.2. Effect of Termination. In the event of any termination of
this Agreement, no party to this Agreement (or any of its directors or officers)
shall have any Liability or further obligation to any other party as a result
hereof.

                                   ARTICLE XI

                           DISPUTE RESOLUTION AND ARBITRATION

               11.1. Agreement to Arbitrate. Except as otherwise specifically
provided in this Agreement (including, without limitation, in Article VII,
concerning Third Party Tax Claims) or in any Ancillary Agreement, the procedures
set forth in this Article XI shall apply to all disputes, controversies or
claims (whether sounding in contract, tort or otherwise) that may arise out of
or relate to, or arise under or in connection with this Agreement or any
Ancillary Agreement, or the

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<PAGE>   66
transactions contemplated hereby or thereby (including all actions taken in
furtherance of the transactions contemplated hereby or thereby on or prior to
the date hereof), or the commercial or economic relationship of the parties
relating hereto or thereto, between or among any member of the Parent Group, or
the Wireless Group. Each party agrees on behalf of itself and each member of its
respective Group that the procedures set forth in this Article XI shall be the
sole and exclusive remedy in connection with any dispute, controversy or claim
relating to any of the foregoing matters and irrevocably waives any right to
commence any Action in or before any Governmental Authority, except as expressly
provided in Sections 11.11(c) and 11.12 and except to the extent provided under
the Arbitration Act in the case of judicial review of arbitration results or
awards. Each party on behalf of itself and each member of its respective Group
irrevocably waives any right to any trial by jury with respect to any claim,
controversy or dispute set forth in the first sentence of this Section 11.1. The
parties agree that claims filed pursuant to this Arbitration provision may seek
direct damages but in no event for such claims shall either party be liable to
the other for any incidental, special, reliance, consequential or any other
indirect damages or losses (including lost profits or revenues).

               11.2. Best Efforts to Resolve Disputes; Mediation. It is the
intent of the parties to use their respective reasonable best efforts to
negotiate and resolve expeditiously any dispute, controversy or claim between or
among them that may arise from time to time on a mutually acceptable negotiated
basis. The parties may, by mutual consent, retain a mediator to aid in any
attempt to informally negotiate resolution of any dispute, although any opinion
expressed by a mediator shall be strictly advisory and shall not be binding on
the parties, nor shall any opinion expressed by the mediator be admissible in
any arbitration proceedings. Costs of a mediation shall be borne equally by the
parties involved in the matter, except that each party shall be responsible for
its own expenses. Mediation is not a prerequisite to a demand for arbitration
under Section 11.3.

               11.3. Demand for Arbitration. At any time before the Applicable
Deadline (as defined below), any party involved in the dispute, controversy or
claim may make a written demand (the "Arbitration Demand Notice") that the
dispute be resolved by binding arbitration, which Arbitration Demand Notice
shall be given to the parties to the dispute, controversy or claim in the manner
set forth in Section 12.5. Except as may be expressly provided in any Ancillary
Agreement, any Arbitration Demand Notice must be asserted within one year after
the later of the occurrence of the act or event giving rise to the underlying
claim or the date on which such act or event was, or should have been, in the
exercise of reasonable due diligence, discovered by the party asserting the
claim (as applicable and as it may in a particular case be specifically extended
by the parties in writing, the "Applicable Deadline"). Any discussions,

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<PAGE>   67
negotiations or mediations between the parties pursuant to this Agreement or
otherwise will not toll the Applicable Deadline unless expressly agreed in
writing by the parties. Each of the parties agrees on behalf of itself and each
member of its Group that if an Arbitration Demand Notice with respect to a
dispute, controversy or claim is not given prior to the expiration of the
Applicable Deadline, as between or among the parties and the members of their
Groups, such dispute, controversy or claim will be barred. Subject to Sections
11.11(c) and 11.12, upon delivery of an Arbitration Demand Notice prior to the
Applicable Deadline, the dispute, controversy or claim shall be decided by an
Arbitration Panel in accordance with the rules set forth in this Article XI.

               11.4. Arbitration Panel. When an Arbitration Demand Notice is
given, the parties involved in the dispute, controversy or claim shall attempt
to select a sole arbitrator satisfactory to all such parties. In the event the
parties are not able jointly to select a sole arbitrator, such parties shall
each appoint an arbitrator within 30 days after delivery of the Arbitration
Demand Notice. Only one arbitrator may be appointed for the Wireless Group and
the Parent Group, respectively. In the event that a sole arbitrator is not
selected, the two chosen arbitrators, within 30 days after the appointment of
the later of them to be appointed, will in turn choose a third arbitrator, and
the three arbitrators thus chosen will constitute the arbitration panel.

               11.5. Commencement and Place of Arbitration. The sole arbitrator
or arbitration panel (as applicable, the "Arbitration Panel") will meet within
thirty (30) days of the last appointment to commence the arbitration, which
period may be extended upon the agreement of the arbitrators. The Arbitration
Panel will set a time for the hearing of the matter which will commence no later
than 90 days after the date of the last appointment. The place of any
arbitration hereunder will be as agreed upon by the parties, or, if the parties
are unable to agree, as set by the Arbitration Panel.

               11.6. Arbitration Hearings. The matter shall be presented to the
arbitrator at a hearing by means of written submissions of memoranda and
verified witness statements, filed simultaneously, and responses, if necessary
in the judgment of the arbitrator or both the parties. If the Arbitration Panel
deems it to be appropriate for a fair resolution of the dispute, live
cross-examination or direct examination may be permitted. The Arbitration Panel
shall actively manage the arbitration with a view to achieving a just, speedy
and cost-effective resolution of the dispute, claim or controversy. The
arbitration hearing will be no longer than 30 full hearing days, unless in the
judgment of the Arbitration Panel the matter is complex and sophisticated and
thereby requires a longer time. The Arbitration Panel may set time and other
limits on the

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<PAGE>   68
presentation of each party's case, its memoranda or other submissions, and may
refuse to receive any proffered evidence, which the Arbitration Panel find to be
cumulative, unnecessary, irrelevant or of low probative nature. Except as
otherwise set forth herein, any arbitration hereunder will be conducted in
accordance with the CPR Rules for Non-Administered Arbitration of Business
Disputes then prevailing (except that the arbitration will not be conducted
under the auspices of the CPR and the fee schedule of the CPR will not apply).
To the extent that the provisions of this Agreement and the prevailing rules of
the CPR conflict, the provisions of this Agreement shall govern.

               11.7. Arbitration Decision. The final decision of the Arbitration
Panel will be rendered in writing to the parties not later than 60 days after
the last hearing date, unless otherwise agreed by the parties in writing. The
decision of the Arbitration Panel will be final and binding on the parties, and
judgment thereon may be had and will be enforceable in any court having
jurisdiction over the parties. Arbitration awards will bear interest at an
annual rate of the Prime Rate plus 2% per annum.

               11.8. Discovery and Related Matters. Any party involved in the
applicable dispute may request limited document production from the other party
or parties of specific and expressly relevant documents. Any such discovery
shall be conducted expeditiously, and it is intended that discovery shall be
limited as compared to the provisions of the Federal Rules of Civil Procedure.
Depositions shall not occur except by consent of the parties or by order of the
Arbitration Panel. Disputes concerning the document production or other
discovery will be determined by written agreement of the parties involved in the
applicable dispute or, failing such agreement, will be referred to the
Arbitration Panel for resolution. All discovery requests will be subject to the
proprietary rights and rights of privilege of the parties, and the Arbitration
Panel will adopt procedures to protect such rights and to maintain the
confidential treatment of the arbitration proceedings (except as may be required
by law). Subject to the foregoing, the Arbitration Panel shall have the power to
issue subpoenas to compel the production of documents relevant to the dispute,
controversy or claim.

               11.9. Arbitration Panel's Authority. The Arbitration Panel shall
have full power and authority to determine issues of arbitrability and to
interpret or construe the applicable provisions of this Agreement or any
Ancillary Agreement and to fashion appropriate remedies for breaches of this
Agreement (including interim or permanent injunctive relief); provided that the
Arbitration Panel shall not have any right or authority (i) in excess of the
authority a court having jurisdiction over the parties and the controversy or
dispute would have absent these arbitration provisions; (ii) to award
incidental, special, reliance, consequential, or other indirect

                                      -63-

<PAGE>   69
damages (including lost profits or revenues);(iii) to award punitive or treble
damages; or (iv) to modify the terms of this Agreement . It is the intention of
the parties that in rendering a decision the Arbitration Panel give effect to
the applicable provisions of this Agreement and the Ancillary Agreements and
follow applicable law (it being understood and agreed that this sentence shall
not give rise to a right of judicial review of the arbitrator's award).

               11.10. Confidentiality. Except as required by law, the parties
agree that the existence and contents of the entire Arbitration, including the
award, shall be deemed a compromise of a dispute under Rule 408 of the Federal
Rules of Evidence, shall not be discoverable in any proceeding, shall not be
admissible in any court (except for the enforcement thereof) or arbitration and
shall not bind or collaterally estop either party with respect to any claim or
defense asserted by any third party. Except as required by law, the parties
shall hold, and shall cause their respective officers, directors, employees,
agents and other representatives to hold, the existence, content and result of
the arbitration or any mediation in confidence in accordance with the provisions
of Article VIII and except as may be required in order to enforce any award.
Each of the parties shall request that any mediator or arbitrator comply with
such confidentiality requirement.

               11.11. Certain Additional Matters. (a) If a party fails or
refuses to appear at and participate in an arbitration hearing after due notice,
the arbitrator may hear and determine the controversy upon evidence produced by
the appearing party.

               (b) Arbitration costs will be borne equally by each party
involved in the matter, except that each party will be responsible for its own
attorney's fees and other costs and expenses, including the costs of witnesses
selected by such party.

               (c) Prior to the time at which the Arbitration Panel are
appointed, any party may seek one or more temporary restraining orders in a
court of competent jurisdiction if necessary in order to preserve and protect
the status quo. Neither the request for, or grant or denial of, any such
temporary restraining order shall be deemed a waiver of the obligation to
arbitrate as set forth herein and the Arbitration Panel may dissolve, continue
or modify any such order.

               (d) In the event that at any time any member of the Arbitration
Panel shall fail to serve as an arbitrator for any reason, the appropriate party
or the two party-selected arbitrators, as the case may be, shall select a new
arbitrator, in accordance with the procedures set forth in Section 11.4. The
extent, if any, to which testimony previously given shall be repeated or may be
relied upon based on the stenographic record (if there is one), shall be
determined by the replacement arbitrator.

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<PAGE>   70
               11.12. Limited Court Actions. (a) Notwithstanding anything herein
to the contrary, in the event that any party reasonably determines the amount in
controversy in any dispute, controversy or claim (or any series of related
disputes, controversies or claims) under this Agreement or any Ancillary
Agreement is, or is reasonably likely to be, in excess of $100 million and if
such party desires to commence an Action in lieu of complying with the
arbitration provisions of this Article, such party shall so state in its
Arbitration Demand Notice. If the other parties to the arbitration disagree
about whether the amount in controversy exceeds $100 million, the Arbitration
Panel selected pursuant to Section 11.4 shall decide the issue. The Arbitration
Panel shall set a date no later than ten days after the date of its appointment
for submissions by the parties with respect to such issue. There shall be no
discovery in connection with such issue. The Arbitration Panel shall render its
decision on such issue within five days of such date so set by the Arbitration
Panel. In the event that the Arbitration Panel determines that the amount in
controversy is or is reasonably likely to be in excess of $100 million, the
provisions of Sections 11.5, 11.6, 11.7, 11.8, and 11.14 shall not apply, and
within 15 days of such decision, any party to the arbitration may elect in lieu
of arbitration, to commence an Action with respect to such dispute, controversy
or claim (or such series of related disputes, controversies or claims) in any
court of competent jurisdiction. If the Arbitration Panel does determines that
the amount in controversy is not in excess of $100 million, the provisions of
this Article (including with respect to time periods) shall apply as if no
determinations were sought or made pursuant to this Section 11.12(a).

               (b) In the event that an arbitration award in excess of $100
million is issued in any arbitration proceeding commenced hereunder, any party
may, within 60 days after the date of such award, submit the dispute,
controversy or claim (or series of related disputes, controversies or claims)
giving rise thereto to a court of competent jurisdiction, regardless of whether
such party or any other party sought to commence an Action in lieu of proceeding
with arbitration in accordance with Section 11.12(a). In such event, the
applicable court may elect to rely on the record developed in the arbitration
or, if it determines that it would be advisable in connection with the matter,
allow the parties to seek additional discovery or to present additional
evidence. Each party shall be entitled to present arguments to the court with
respect to whether any such additional discovery or evidence shall be permitted
and with respect to all other matters relating to the applicable dispute,
controversy or claim (or series of related disputes, controversies or claims).

               11.13. Continuity of Performance and Remaining Obligations.
Unless otherwise agreed in writing, the parties will continue to provide service
and honor all other commitments under this Agreement and each Ancillary
Agreement during the course of dispute resolution

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<PAGE>   71
pursuant to the provisions of this Article IX with respect to all matters not
subject to such dispute, controversy or claim.

               11.14. Law Governing Arbitration Procedures. The interpretation
of the provisions of this Article XI, only insofar as they relate to the
agreement to arbitrate and any procedures pursuant thereto, shall be governed by
the Arbitration Act and other applicable federal law. In all other respects, the
interpretation of this Agreement shall be governed as set forth in Section 12.2.

               11.15. Non-applicability of Article. Notwithstanding anything
herein to the contrary, this Article XI shall not apply to any dispute,
controversy or claim or to any other matter whatsoever arising under Section 7.2
or 7.3 hereof, the Tax Sharing Agreement, any other tax sharing agreement or any
Third Party Tax Claims or to any other matter relating to Taxes. This Article
similarly shall not apply to the extent provided in any other Ancillary
Agreement.

                                  ARTICLE XII

                                  MISCELLANEOUS

               12.1. Counterparts; Entire Agreement; Corporate Power. (a) This
Agreement and each Ancillary 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 hereto or thereto and delivered to each other party hereto or
thereto.

               (b) This Agreement, and the Ancillary Agreements and the
Exhibits, Schedules and Appendices hereto and thereto contain the entire
agreement between the parties with respect to the subject matter hereof or
thereof, supersede all previous agreements, negotiations, discussions, writings,
understandings, commitments and conversations with respect to such subject
matter and there are no agreements or understandings between the parties other
than those set forth or referred to herein or therein.

               (c) Parent represents on behalf of itself and each other member
of the Parent Group and Wireless represents on behalf of itself and each other
member of the Wireless Group as follows:

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<PAGE>   72
                              (i) each such Person has the requisite corporate
               or other power and authority and has taken all corporate or other
               action necessary in order to execute, deliver and perform each of
               this Agreement and each other Ancillary Agreements to which it is
               a party and to consummate the transactions contemplated hereby
               and thereby; and

                              (ii) this Agreement and each Ancillary Agreement
               to which it is a party has been duly executed and delivered by it
               and constitutes a valid and binding agreement of it enforceable
               in accordance with the terms thereof.

               (d) Each party hereto acknowledges that it and each other party
hereto is executing certain of the Ancillary Agreements by facsimile, stamp or
mechanical signature. Each party hereto expressly adopts and confirms each such
facsimile, stamp or mechanical signature made in its respective name as if it
were a manual signature, agrees that it will not assert that any such signature
is not adequate to bind such party to the same extent as if it were signed
manually and agrees that at the reasonable request of any other party hereto at
any time it will as promptly as reasonably practicable cause each such Ancillary
Agreement to be manually executed (any such execution to be as of the date of
the initial date thereof).

               (e) Notwithstanding any provision of this Agreement or any
Ancillary Agreement, neither Parent nor Wireless, and no member of their
respective Groups, shall be required to take or omit to take any act that would
violate its fiduciary duties to any minority or other stockholders of any other
non-wholly owned Subsidiary or Affiliate of Parent or Wireless, as the case may
be (it being understood that directors' qualifying shares or similar interests
will be disregarded for purposes of determining whether a Subsidiary is wholly
owned).

               12.2. Governing Law. This Agreement and, unless expressly
provided therein, each Ancillary Agreement, shall be governed by and construed
and interpreted in accordance with the laws of the State of New York,
irrespective of the choice of laws principles of the State of New York, as to
all matters, including matters of validity, construction, effect,
enforceability, performance and remedies.

               12.3. Assignability. Except as set forth in any Ancillary
Agreement, this Agreement and each Ancillary Agreement shall be binding upon and
inure to the benefit of the parties hereto and thereto, respectively, and their
respective successors and assigns; provided, however, that, except as set forth
in this Agreement (including Section 9.2) or in any Ancillary Agreement, no
party hereto or thereto may assign its respective rights or delegate its
respective obligations under this Agreement or any Ancillary Agreement without
the express prior written consent of each of the other parties hereto or
thereto.

                                      -67-

<PAGE>   73
               12.4. Third Party Beneficiaries. Except for the indemnification
rights under this Agreement of any Parent Indemnitee or any Wireless Indemnitee
in their respective capacities as such, (a) the provisions of this Agreement and
each Ancillary Agreement are solely for the benefit of the parties hereto and
are not intended to confer upon any Person except the parties any rights or
remedies hereunder, and (b) there are no third party beneficiaries of this
Agreement or any Ancillary Agreement and neither this Agreement nor any
Ancillary Agreement shall provide any third person (including any insurance
company) with any remedy, claim, liability, reimbursement, claim of action or
other right in excess of those existing without reference to this Agreement or
any Ancillary Agreement.

               12.5. Notices. All notices or other communications under this
Agreement or any Ancillary Agreement shall be in writing and shall be deemed to
be duly given as of the date delivered, mailed or transmitted, and shall be
effective upon receipt, if delivered personally, mailed by registered or
certified mail (postage prepaid, return receipt requested) or delivered by a
nationally recognized courier service to the parties at the following address or
sent by electronic transmission to the telecopier numbers specified below:

                  If to Parent, to:              AT&T Corp.
                                                 295 North Maple Drive
                                                 Basking Ridge, NJ  07920
                                                 Attn:  Vice President-Law and
                                                 Corporate Secretary
                                                 Telecopier: 908-221-4408

                  If to Wireless to:             AT&T Wireless Services, Inc.
                                                 7277 164th NE
                                                 Redmond, WA 98052
                                                 Attn:  General Counsel
                                                 Telecopier: 425-580-8333

Any party may, by notice to the other parties, change the address to which such
notices are to be given.

               12.6. Severability. If any provision of this Agreement or any
Ancillary Agreement or the application thereof to any Person or circumstance is
determined by a court of

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<PAGE>   74
competent jurisdiction to be invalid, void or unenforceable, the remaining
provisions hereof or thereof, or the application of such provision to Persons or
circumstances or in jurisdictions other than those as to which it has been held
invalid or unenforceable, shall remain in full force and effect and shall in no
way be affected, impaired or invalidated thereby, so long as the economic or
legal substance of the transactions contemplated hereby or thereby, as the case
may be, is not affected in any manner adverse to any party. Upon such
determination, the parties shall negotiate in good faith in an effort to agree
upon such a suitable and equitable provision to effect the original intent of
the parties.

               12.7. Force Majeure. No party shall be deemed in default of this
Agreement or any Ancillary Agreement to the extent that any delay or failure in
the performance of its obligations under this Agreement or any Ancillary
Agreement results from any cause beyond its reasonable control and without its
fault or negligence, such as acts of God, acts of civil or military authority,
embargoes, epidemics, war, riots, insurrections, fires, explosions, earthquakes,
floods, unusually severe weather conditions, labor problems or unavailability of
parts, or, in the case of computer systems, any failure in electrical or air
conditioning equipment. In the event of any such excused delay, the time for
performance shall be extended for a period equal to the time lost by reason of
the delay.

               12.8. Expenses. Except as expressly set forth in this Agreement
or in any Ancillary Agreement, whether or not the Separation, the Mandatory
Exchange or the Distribution are consummated, all third party fees, costs and
expenses paid or incurred in connection with the Separation Transactions will be
paid by Parent.

               12.9. Late Payments. Except as expressly provided to the contrary
in this Agreement or in any Ancillary Agreement, any amount not paid when due
pursuant to this Agreement or any Ancillary Agreement (and any amounts billed or
otherwise invoiced or demanded and properly payable that are not paid within 30
days of such bill, invoice or other demand) shall accrue interest at a rate per
annum equal to the Prime Rate plus 2%.

               12.10. Headings. The article, section and paragraph headings
contained in this Agreement and in the Ancillary Agreements are for reference
purposes only and shall not affect in any way the meaning or interpretation of
this Agreement or any Ancillary Agreement.

               12.11. Survival of Covenants. Except as expressly set forth in
any Ancillary Agreement, the covenants, representations and warranties contained
in this Agreement and each Ancillary Agreement, and liability for the breach of
any obligations contained herein, shall survive each of the Separation, the
Mandatory Exchange and the Distribution.

                                      -69-

<PAGE>   75
               12.12. Waivers of Default. Waiver by any party of any default by
any other party of any provision of this Agreement or any Ancillary Agreement
shall not be deemed a waiver by the waiving party of any subsequent or other
default, nor shall it prejudice the rights of the other party.

               12.13. Specific Performance. In the event of any actual or
threatened default in, or breach of, any of the terms, conditions and provisions
of this Agreement or any Ancillary Agreement, the party or parties who are or
are to be thereby aggrieved shall have the right to specific performance and
injunctive or other equitable relief of its or their rights under this Agreement
or such Ancillary Agreement, in addition to any and all other rights and
remedies at law or in equity, and all such rights and remedies shall be
cumulative. The parties agree that the remedies at law for any breach or
threatened breach, including monetary damages, are inadequate compensation for
any loss and that any defense in any action for specific performance that a
remedy at law would be adequate is waived. Any requirements for the securing or
posting of any bond with such remedy are waived.

               12.14. Amendments. No provisions of this Agreement or any
Ancillary Agreement shall be deemed waived, amended, supplemented or modified by
any party, unless such waiver, amendment, supplement or modification is in
writing and signed by the authorized representative of the party against whom
such waiver, amendment, supplement or modification is sought to be enforced.

               12.15. Interpretation. In the event of a conflict between a
provision of this Agreement and any provision of any Ancillary Agreement, any
specific provision of the applicable Ancillary Agreement shall control. Words in
the singular shall be held to include the plural and vice versa and words of one
gender shall be held to include the other gender as the context requires. The
terms "hereof," "herein," and "herewith" and words of similar import shall,
unless otherwise stated, be construed to refer to this Agreement (or the
applicable Ancillary Agreement) taken as a whole (including all of the
Schedules, Exhibits and Appendices hereto and thereto) and not to any particular
provision of this Agreement (or such Ancillary Agreement). Article, Section,
Exhibit, Schedule and Appendix references are to the Articles, Sections,
Exhibits, Schedules and Appendices to this Agreement (or the applicable
Ancillary Agreement) unless otherwise specified. The word "including" and words
of similar import when used in this Agreement (or the applicable Ancillary
Agreement) shall mean "including, without limitation," unless the context
otherwise requires or unless otherwise specified. The word "or" shall not be
exclusive. Unless expressly stated to the contrary in this Agreement or in any
Ancillary Agreement, all references to "the date hereof," "the date of this
Agreement," "hereby"

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<PAGE>   76
and "hereupon" and words of similar import shall all be references to the
Redemption Date, regardless of any amendment or restatement hereof.

               12.16. Effectiveness. None of this Agreement or any Ancillary
Agreement shall become effective until the Redemption Date (which shall be
deemed to be the date hereof or thereof for all purposes). In the event that the
Redemption Date shall not occur on or prior to September 30, 2001, this
Agreement and each Ancillary Agreement shall automatically be void and of no
further force or effect.

                                      -71-
<PAGE>   77
               IN WITNESS WHEREOF, the parties have caused this Separation and
Distribution Agreement to be executed by their duly authorized representatives.

                                   AT&T CORP.

                                   By: /s/ Marilyn J. Wasser
                                       ---------------------------------
                                       Name:  Marilyn J. Wasser
                                       Title: Vice President -- Law and
                                              Secretary

                                   AT&T WIRELESS SERVICES, INC.

                                   By: /s/ Joseph McCabe Jr.
                                       ---------------------------------
                                       Name:  Joseph McCabe Jr.
                                       Title: Executive Vice President and
                                              Chief Financial Officer

                                      -72-<PAGE>   1
                                                                    EXHIBIT 10.2

                  AMENDED AND RESTATED TAX SHARING AGREEMENT

            AMENDED AND RESTATED TAX SHARING AGREEMENT (the "Agreement") entered
into as of May 2, 2000, amended and restated as of June 4, 2001, by and among
AT&T Corp., a New York corporation ("AT&T"), AWG LLC, a Delaware limited
liability company ("AWG"), AT&T Wireless Services, Inc., a Delaware corporation
("Wireless"), AT&T Wireless PCS, LLC, a Delaware limited liability company
("Wireless PCS"), each other entity that is a signatory hereto (the "Other
Signatories"), any entities which become parties hereto pursuant to Section 21
hereof and each of the Subsidiaries of AWG, Wireless, Wireless PCS and the Other
Signatories.

            WHEREAS Wireless desires to be included, and AWG, Wireless, Wireless
PCS and the Other Signatories desire that their Subsidiaries be included in the
filing of consolidated federal income Tax returns on behalf of the AT&T
Affiliated Group;

            WHEREAS AT&T, AWG, Wireless, Wireless PCS, the Other Signatories,
and their respective Subsidiaries wish to allocate and settle among themselves
in an equitable manner the consolidated federal income Tax liability of the AT&T
Affiliated Group;

            WHEREAS Wireless desires, to the extent required by applicable
state, local or foreign law to be included, and AWG, Wireless, Wireless PCS and
the Other Signatories desire that their Subsidiaries be included, in combined,
consolidated and unitary state, local and foreign Tax returns on behalf of the
AT&T Affiliated Group;

            WHEREAS AT&T, AWG, Wireless, Wireless PCS, the Other Signatories and
their respective Subsidiaries wish to allocate and settle among themselves in an
equitable manner the state, local or foreign Tax liability in connection with
such combined, consolidated and unitary state, local and foreign Tax returns;
<PAGE>   2
            WHEREAS AT&T and Wireless have entered into a Separation and
Distribution Agreement, dated June 4, 2001, providing for the separation of the
Wireless Group from AT&T (the "Separation and Distribution Agreement");

            WHEREAS pursuant to the terms of the Separation and Distribution
Agreement, (i) AT&T will contribute all of the assets and liabilities of the
Wireless Group not currently held by Wireless or any of its Subsidiaries to
Wireless, (ii) all the issued and outstanding shares of AT&T Wireless Group
Tracking Stock will be redeemed in exchange for shares of common stock of
Wireless (the "Exchange") and (iii) AT&T's remaining interest in Wireless will
be distributed pro rata to holders of AT&T Common Stock (the "Distribution");

            WHEREAS, for federal income Tax purposes, it is intended that the
transfer of assets by AT&T to Wireless, the Exchange and the Distribution
(collectively, the "Separation Transactions") constitute a tax-free spin-off
under the provisions of Sections 355, 361(c) and 368(a)(1)(D) of the Internal
Revenue Code of 1986, as amended (the "Code");

            WHEREAS, at the end of the day on which the Distribution occurs (the
"Distribution Date"), the taxable year of Wireless and its Subsidiaries shall
close for U.S. federal income Tax purposes;

            WHEREAS AT&T, AWG, Wireless, Wireless PCS, the Other Signatories and
their respective Subsidiaries wish to provide for the principles and
responsibilities of the parties to this Agreement regarding future Adjustments
with respect to Taxes, Tax Proceedings and other related Tax matters; and

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

                                      -2-
<PAGE>   3
      1. Definitions.  For purposes of this Agreement, the following terms
shall be defined as follows:

      1.1. "Adjustment" shall mean the deemed increase or decrease in a Tax,
determined on an issue-by-issue or transaction-by-transaction basis, as
appropriate, and using the assumptions set forth in the next sentence, resulting
from an adjustment made or proposed by a Governmental Authority with respect to
any amount reflected or required to be reflected on any Tax Return relating to
such Tax. For purposes of determining such deemed increase or decrease in a Tax,
the following assumptions will be used: (a) in the case of any income Tax, the
highest marginal Tax rate or, in the case of any other Tax, the highest
applicable Tax rate, in each case in effect with respect to that Tax for the
taxable period or any portion of the taxable period to which the adjustment
relates; and (b) such determination shall be made without regard to whether any
actual increase or decrease in such Tax will in fact be realized with respect to
the Tax Return to which such adjustment relates. A "Adjustment" shall also mean
a change in one or more apportionment factors used for determining any state or
local consolidated, combined or unitary income or franchise Taxes which are
required to be reported on a Joint Return.

      1.2. "Agreement" shall have the meaning set forth in the first paragraph
hereof.

      1.3.  "Allocated Taxable Income (Loss)" shall mean, with respect to the
Common Stock Group or the Wireless Group, the amount equal to (i) such Group's
contribution to the gross income of the Hypothetical Common Stock/Wireless
Affiliated Group, net of (ii) the aggregate of all losses, deductions and other
Tax attributes of such Group to the extent the same may be used by any member of
the Hypothetical Common Stock/Wireless Affiliated Group. For purposes of the
federal alternative minimum Tax ("AMT"), Allocated Taxable Income (Loss) shall
mean, with respect to the Common Stock Group or the Wireless Group, the amount
equal to

                                      -3-
<PAGE>   4
(i) such Group's contribution to the gross income for AMT purposes of the
Hypothetical Common Stock/Wireless Affiliated Group, net of (ii) the aggregate
of all losses, deductions and other Tax attributes for AMT purposes of such
Group to the extent the same may be used by any member of the Hypothetical
Common Stock/Wireless Affiliated Group. In the case of any state or local
consolidated, combined or unitary income or franchise Taxes which are required
to be reported on a Joint Return, the amount of Allocated Taxable Income (Loss)
of the Common Stock Group or the Wireless Group shall be equal to the product of
such Group's income (loss) and the apportionment factors (property, payroll,
sales), calculated on a consolidated basis, unless such amount is determined
pursuant to another allocation method that is agreed with or mandated by a
specific jurisdiction. For purposes of the preceding sentence, the apportionment
factors shall be determined for each taxable period.

      1.4.  "AMT" shall have the meaning set forth in the definition of
"Allocated Taxable Income (Loss)."

      1.5.  "AMTI" shall have the meaning set forth in Section 3.2(d) hereof.

      1.6.  "AMTL" shall have the meaning set forth in Section 3.2(d) hereof.

      1.7.  "Associated" shall have the meaning set forth in Section 2 hereof.

      1.8.  "AT&T" shall have the meaning set forth in the first paragraph
hereof.

      1.9. "AT&T Affiliated Group" shall mean (i) the affiliated group, within
the meaning of Section 1504(a) of the Code, consisting of AT&T and its
Subsidiaries, (ii) any combined, consolidated or unitary group for state, local
or foreign Tax purposes that includes AT&T or any of its Subsidiaries and (iii)
for any taxable period, any True Legal Entity that files Joint Returns for such
taxable period.

      1.10. "AT&T Charter" shall mean the Amended Certificate of
Incorporation of AT&T.

                                      -4-
<PAGE>   5
      1.11. "AT&T Common Stock" shall mean the common stock, par value $1.00
per share, of AT&T.

      1.12. "AT&T Wireless Group Tracking Stock" shall have the meaning ascribed
to such term in the Proxy Statement.

      1.13. "AWG" shall have the meaning set forth in the first paragraph
hereof.

      1.14. "Code" shall have the meaning set forth in the recitals hereto.

      1.15. "Common Stock Group" shall mean (i) the Hypothetical Legal Entity
Associated with AT&T pursuant to Section 2(c) and (ii) each of the other Legal
Entities that were at any time owned directly or indirectly by AT&T
(Hypothetical Legal Entities Associated with any Mixed Entity other than AT&T
being treated for this purpose as owned directly or indirectly by AT&T) other
than any member of the Liberty Group or the Wireless Group.

      1.16. "Common Stock Indemnitee" shall mean each Legal Entity that is a
member of the Common Stock Group and their respective directors, officers,
employees, affiliates, agents, successors and assigns.

      1.17. "Controlling Party" shall mean AT&T or any other member of the
Common Stock Group or Wireless or any other member of the Wireless Group, as the
case may be, that filed or, if no such Tax Return has been filed, was required
to file, a Tax Return that is the subject of any Tax Proceeding, or any
successor and/or assign of any of the foregoing; provided, however, that in the
case of any consolidated or combined return, the person that actually filed such
consolidated or combined return (or any successor and/or assign of such person)
will be the Controlling Party.

      1.18. "Designated Rate" shall mean the underpayment rate as defined in
Section 6621 of the Code.

                                      -5-
<PAGE>   6
      1.19. "Disputed Adjustment" shall have the meaning set forth in Section
9(d)(ii) hereof.

      1.20. "Distribution" shall have the meaning set forth in the recitals
hereto.

      1.21. "Distribution Date" shall have the meaning set forth in the
recitals hereto.

      1.22. "Exchange" shall have the meaning set forth in the recitals
hereto.

      1.23. "Federal CNOL" shall have the meaning set forth in Section
3.2(a)(ii) hereof.

      1.24. "Federal Tax Allocation Agreement" shall mean the Federal Tax
Allocation Agreement dated as of February 1, 1996, by and among AT&T and each of
its subsidiaries.

      1.25. "Final Determination" shall mean a closing agreement with the
Internal Revenue Service or the relevant state or local Governmental
Authorities, an agreement contained in Internal Revenue Service Form 870-AD or
other comparable form, an agreement that constitutes a determination under
Section 1313(a)(4) of the Code, a claim for refund which has been allowed, a
deficiency notice with respect to which the period for filing a petition with
the Tax Court or the relevant state or local tribunal has expired or a decision
of any court of competent jurisdiction that is not subject to appeal or as to
which the time for appeal has expired.

      1.26. "Governmental Authority" shall have the meaning set forth in the
definition of "Tax."

      1.27. "Group" shall mean any of the Common Stock Group, the Wireless
Group and the Liberty Group.

      1.28. "Hypothetical Common Stock/Wireless Affiliated Group" shall have
the meaning set forth in Section 3.2(a)(i) hereof.

      1.29. "Hypothetical Legal Entity" shall mean a hypothetical corporation,
partnership, limited liability company or other legal entity.

                                      -6-
<PAGE>   7
      1.30. "Inconsistent Position" shall have the meaning set forth in
Section 11(b)(ii) hereof.

      1.31. "Independent Third Party" means a nationally recognized law firm
or any of the following accounting firms or their successors: Arthur Andersen
& Co.; Ernst & Young; KPMG Peat Marwick; Deloitte & Touche; and
PricewaterhouseCoopers.

      1.32. "Initial Determination" shall have the meaning set forth in
Section 9(e)(ii)(I).

      1.33. "Interested Party" shall mean AT&T or any other member of the Common
Stock Group or Wireless or any other member of the Wireless Group (including any
successor and/or assign of any of each of the foregoing), as the case may be, to
the extent (a) such person is not the Controlling Party with respect to a Tax
Proceeding; and (b) such person (i) may be liable for, or required to make, any
indemnity payment, reimbursement or other payment pursuant to the provisions of
this Agreement with respect to such Tax Proceeding; or (ii) may be entitled to
receive any indemnity payment, reimbursement or other payment pursuant to the
provisions of this Agreement with respect to such Tax Proceeding; provided,
however, that in no event shall a member of either the Common Stock Group or the
Wireless Group, as the case may be, be an Interested Party in a Tax Proceeding
in which another member of its Group is the Controlling Party with respect to
the Tax Proceeding. For the avoidance of doubt, (i) in no event shall a member
of the Common Stock Group be an Interested Party with respect to any Tax
Proceeding relating to the Wireless Group (or any member thereof) with respect
to a Post-Distribution Taxable Period and (ii) in no event shall a member of the
Wireless Group be an Interested Party with respect to any Tax Proceeding
relating to the Common Stock Group (or any member thereof) with respect to a
Post-Distribution Taxable Period.

      1.34. "Interested Party Notice" shall have the meaning set forth in
Section 9(d)(ii).

                                      -7-
<PAGE>   8
      1.35. "Interests" shall have the meaning set forth in Section 3.2(e)(i)
hereof.

      1.36. "Issue Date" shall mean the date on which AT&T Wireless Group
Tracking Stock was initially issued.

      1.37. "Joint Return" shall mean any Tax Return that includes information
related to at least two Legal Entities, of which one Legal Entity is a member of
the Wireless Group and the other Legal Entity is a member of a different Group.

      1.38. "Legal Entity" shall mean a True Legal Entity or a Hypothetical
Legal Entity.

      1.39. "Liberty AMT Sharing Payment" shall have the meaning set forth in
Section 3.2(d)(ii) hereof.

      1.40. "Liberty Federal Tax Sharing Payment" shall have the meaning set
forth in Section 3.2(a)(ii) hereof.

      1.41. "Liberty Group" shall mean the Legal Entities that own or owned the
assets, and are or were primarily responsible for the liabilities, (a) tracked
(or to be tracked) by Liberty Media Group Tracking Stock or (b) otherwise
included (or to be included) in the Liberty Media Group (as defined in the AT&T
Charter) under the AT&T Charter, including any Legal Entity that owned such
assets and was primarily responsible for such liabilities on or prior to the
Issue Date.

      1.42. "Liberty Media Group Tracking Stock" shall have the meaning ascribed
to such term in the Proxy Statement.

      1.43. "Liberty State, Local or Foreign Tax Sharing Payment" shall have the
meaning set forth in Section 3.2(b)(ii) hereof.

      1.44. "Losses" shall mean costs, expenses, fees, liabilities,
obligations and losses.

      1.45. "Mixed Entity" shall have the meaning set forth in Section 2
hereof.

                                      -8-
<PAGE>   9
      1.46. "Non-Income Taxes" shall mean all Taxes (as defined in Section 1.59
hereof) other than any Tax which is based upon, measured by, or calculated with
respect to (i) net income or profits (including, but not limited to, any capital
gains, gross receipts, value added or minimum Tax) or (ii) multiple bases
(including, but not limited to, corporate franchise, doing business or
occupation Taxes) if one or more of the bases upon which such Tax may be based,
by which it may be measured, or with respect to which it may be calculated is
described in clause (i) hereof. For the avoidance of doubt, Non-Income Taxes
shall include, but not be limited to, sales, use, real property gains, real or
personal property, transfer or similar Taxes.

      1.47. "Other Signatories" shall have the meaning set forth in the first
paragraph hereof.

      1.48. "Post-Distribution Taxable Period" shall mean a taxable period that,
to the extent it relates to a member of the Wireless Group, begins after the
Distribution Date and the portion beginning after the Distribution Date of any
taxable period that includes (but does not end) on such day.

      1.49. "Pre-Closing Taxable Period" for any Legal Entity shall mean any
taxable period that ends, with respect to such entity, on or prior to the Issue
Date.

      1.50. "Pre-Distribution Taxable Period" shall mean a taxable period that,
to the extent it relates to a member of the Wireless Group, ends after the Issue
Date and on or prior to the Distribution Date and the portion ending on the
Distribution Date of any taxable period that includes (but does not end) on such
day.

      1.51. "Proxy Statement" shall mean the Proxy Statement/Prospectus of
AT&T dated January 26, 2000.

      1.52. "R&E" shall have the meaning set forth in Section 3.2(c) hereof.

      1.53. "Separate Return" shall mean any Tax Return that is not a Joint
Return.

                                      -9-
<PAGE>   10
      1.54. "Separation and Distribution Agreement" shall have the meaning
set forth in the recitals hereto.

      1.55. "Separation Transactions" shall have the meaning set forth in the
recitals hereto.

      1.56. "State and Local Income Tax Allocation Agreement" shall mean the
State and Local Income Tax Allocation Agreement dated as of the first day of the
combined return taxable year beginning January 1, 1995 by and among AT&T and
each of its subsidiaries.

      1.57. "State, Local or Foreign CNOL" shall have the meaning set forth
in Section 3.2(b)(ii) hereof.

      1.58. "Subsidiary" shall mean, with respect to any True Legal Entity, any
other True Legal Entity of which at least (i) 50% of the equity and (ii) 50% of
the voting interests are owned, directly or indirectly, by such first True Legal
Entity.

      1.59. "Tax" shall mean all forms of taxes, fees, imposts, levies or other
assessments whenever created or imposed, and whether of the United States or
elsewhere, and whether imposed by a local, municipal, governmental, state,
foreign, federation or other body (a "Governmental Authority"), and, without
limiting the generality of the foregoing, shall include income, gross receipts,
business and occupation, property, sales, use, license, excise, franchise,
capital stock, employment, payroll, unemployment insurance, social security,
stamp, environmental, value added, Telecom Pass Through Tax, alternative or
added minimum, ad valorem, trade, recording, withholding, occupation or transfer
tax, custom or duty or other like governmental assessment or charge of any kind
whatsoever, whether computed on a separate, consolidated, unitary, combined or
any other basis, together with any related interest, penalties and additions
imposed by any Governmental Authority.

                                      -10-
<PAGE>   11
      1.60. "Tax Item" shall mean any item of income, gain, loss, deduction,
credit, recapture of credit or any other item which increases or decreases Taxes
(including Non-Income Taxes) paid or payable, including an adjustment under Code
Section 481 resulting from a change in accounting method.

      1.61. "Tax Proceeding" shall mean any Tax audit, examination, controversy
or litigation with or against any Governmental Authority.

      1.62. "Tax Return" shall mean any report, return or other information
(including any attached schedules or any amendments to such report, return or
other information) required to be supplied to or filed with a Governmental
Authority with respect to any Tax, including an information return, claim for
refund, amended return or declaration or estimated Tax return.

      1.63. "Telecom Pass Through Taxes" shall mean federal excise Taxes on
telecommunications services, and those state, local and municipal Taxes which
are passed through to end-user customers, including but not limited to gross
receipts taxes, 911 excise Taxes, utility user Taxes, sales and use Taxes,
street utility business charges, telephone device for deaf and hearing impaired
charges or Taxes and universal lifeline telephone service Taxes, or any other
Taxes or charges imposed by public utility commissions and other similar
governmental agencies.

      1.64. "Treasury Regulations" shall mean the Treasury Regulations
promulgated under the Code.

      1.65. "True Legal Entity" shall mean a corporation, partnership, limited
liability company or other entity under state or other applicable organizational
law, other than a disregarded entity (i.e., such term shall mean an entity under
state or other applicable

                                      -11-
<PAGE>   12
organizational law other than an entity that is not treated as an entity
separate from its owner under Section 301.7701-3 of the Treasury Regulations).

      1.66. "Ultimate Determination" shall have the meaning set forth in
Section 9(e)(ii)(III) hereof.

      1.67.  "Wireless" shall have the meaning set forth in the first
paragraph hereof.

      1.68. "Wireless Group" shall mean the Legal Entities that own or owned the
assets, and are or were primarily responsible for the liabilities, (a) tracked
(or to be tracked) by the AT&T Wireless Tracking Stock or (b) otherwise included
(or to be included) in the Wireless Group (as defined in the AT&T Charter) under
the AT&T Charter, including any Legal Entity that owned such assets and was
primarily responsible for such liabilities on or prior to the Issue Date

      1.69. "Wireless Inconsistent Position" shall have the meaning set forth
in Section 11(b)(ii) hereof.

      1.70. "Wireless Indemnitee" shall mean each Legal Entity that is a member
of the Wireless Group and their respective directors, officers, employees,
affiliates, agents, successors and assigns.

      1.71. "Wireless Parties" shall have the meaning set forth in Section 10
hereof.

      1.72. "Wireless PCS" shall have the meaning set forth in the first
paragraph hereof.

      2. Treatment of Legal Entities That Would be Members of More Than One
Group. In the event that a True Legal Entity which is a member of the AT&T
Affiliated Group would otherwise be a member of both the Wireless Group and
another Group (a "Mixed Entity"), (a) each of the assets and liabilities of the
True Legal Entity tracked by AT&T Wireless Group Tracking Stock (and related Tax
attributes) shall be assigned to one Hypothetical Legal Entity, (b) each of the
assets and liabilities of the True Legal Entity tracked by Liberty Media Group

                                      -12-
<PAGE>   13
Tracking Stock (and related Tax attributes) shall be assigned to a second
Hypothetical Legal Entity and (c) the remaining assets, liabilities and Tax
attributes shall be assigned to a third Hypothetical Legal Entity (such
Hypothetical Legal Entities being referred to herein as the Hypothetical Legal
Entities "Associated" with the Mixed Entity). Each Hypothetical Legal Entity
shall be treated as owning the assets, being primarily responsible for the
liabilities, and having the Tax attributes of, and the Tax and legal personality
comparable to those of, the Mixed Entity with which the Hypothetical Legal
Entity is Associated. The stock in a Hypothetical Legal Entity shall be treated
as represented by the stock in the Mixed Entity with which the Hypothetical
Legal Entity is Associated. In the event that an asset, liability or Tax
attribute cannot be Associated with the business or investments of a single
Group, it shall be reasonably allocated between the Hypothetical Legal Entities
taking into account the nature of the asset, liability or Tax attribute.

      3. Wireless Tax Sharing Payments.
            3.1. In General. In determining a party's liability and/or
obligation to make, or the right to receive, any indemnity payment,
reimbursement or other payment in respect of any Tax under this Agreement, any
taxable period or portion of a taxable period that includes the Distribution
Date shall be deemed to include and end on such Distribution Date, and no party
shall have any liability and/or obligation to make, or right to receive any
indemnity payment, reimbursement or other payment in respect of any Tax under
this Agreement with respect to any taxable period or portion of a taxable period
that begins or is deemed to begin after the Distribution Date.

      3.2.  Tax Sharing Payments with respect to Pre-Distribution Taxable
Periods.
            (a)   Federal Income Taxes (other than AMT).

                                      -13-
<PAGE>   14

                  (i) If the hypothetical affiliated group consisting of the
Common Stock Group and the Wireless Group (the "Hypothetical Common
Stock/Wireless Affiliated Group") has consolidated federal taxable income for
such taxable period, then (I) if the Wireless Group has Allocated Taxable
Income, Wireless, as agent for the Wireless Group, shall pay AT&T the federal
income Tax on the Wireless Group's Allocated Taxable Income for the taxable
period and (II) if the Wireless Group has an Allocated Taxable Loss for the
taxable period, AT&T shall pay Wireless, as agent for the Wireless Group, the
amount by which the Hypothetical Common Stock/Wireless Affiliated Group's
federal income Taxes would be reduced for the taxable period by reason of the
Wireless Group's Allocated Taxable Loss.

                  (ii) If the Hypothetical Common Stock/Wireless Affiliated
Group has a consolidated NOL for federal income Tax purposes ("Federal CNOL")
for such taxable period, then (I) if the Common Stock Group and the Wireless
Group each have Allocated Taxable Losses, the federal income Tax refund or other
Tax benefit arising from the Federal CNOL (and any payment from Liberty Group in
respect of Liberty Group federal taxable income with respect to such taxable
period (a "Liberty Federal Tax Sharing Payment")) shall be shared between the
Common Stock Group and the Wireless Group in proportion to their respective
Allocated Taxable Losses for the taxable period, (II) if the Wireless Group has
an Allocated Taxable Loss and the Common Stock Group has Allocated Taxable
Income, then AT&T shall pay Wireless, as agent for the Wireless Group, the
amount by which the Hypothetical Common Stock/Wireless Affiliated Group's
federal income Taxes for the taxable period would be reduced by reason of the
Wireless Group's Allocated Taxable Loss and the federal income Tax refund or
other Tax benefit arising from the Federal CNOL and any Liberty Federal Tax
Sharing Payment shall be allocated to the Wireless Group and (III) if the
Wireless Group has Allocated Taxable Income

                                      -14-
<PAGE>   15
and the Common Stock Group has an Allocated Taxable Loss, then Wireless, as
agent for the Wireless Group, shall pay AT&T the amount by which the
Hypothetical Common Stock/Wireless Affiliated Group's Taxes for the taxable
period would be reduced by reason of the Common Stock Group's Allocated Taxable
Loss and the Common Stock Group shall retain the federal income Tax refund or
other Tax benefit arising from the Federal CNOL (and any Liberty Federal Tax
Sharing Payment).

                  (iii) If Section 3.2(a)(ii)(I) applies, then AT&T shall first
carry back the Federal CNOL of the Hypothetical Common Stock/Wireless Affiliated
Group for the taxable period, to the extent permitted by applicable law, and
then shall carry forward such CNOL. Such carryback or carryforward, as the case
may be, shall be treated as applied (a) for each applicable taxable period in
proportion to the respective Allocated Taxable Losses of the Common Stock Group
and the Wireless Group for the taxable period of the Federal CNOL and (b)
beginning with the earliest taxable period permitted by applicable law. To the
extent AT&T obtains a Tax refund or other Tax benefit arising from such
carryback or carryforward (or a Liberty Federal Tax Sharing Payment), AT&T shall
compensate the Wireless Group for the Tax refund or other Tax benefit received
(and any Liberty Federal Tax Sharing Payment) in an amount which is
proportionate to the Wireless Group's Allocated Taxable Loss included in the
Federal CNOL so applied within ten (10) days of AT&T's receipt of such Tax
refund (or Liberty Federal Tax Sharing Payment) or within ten (10) days of
AT&T's filing the Tax return with respect to which it claims such other Tax
benefit. For the avoidance of doubt, if AT&T obtains no Tax refund or other Tax
benefit with respect to a Federal CNOL described in this paragraph (and no
Liberty Federal Tax Sharing Payment), AT&T shall make no payment to Wireless in
respect of the Wireless Group's Allocated Taxable Loss for the taxable period of
the CNOL.

                                      -15-
<PAGE>   16
                  (b) Consolidated State, Local and Foreign Taxes. With respect
to a Joint Return for a state, local or foreign jurisdiction:

                  (i) If the Hypothetical Common Stock/Wireless Affiliated Group
has consolidated, combined or unitary taxable income in such jurisdiction for
such taxable period, then (I) if the Wireless Group has Allocated Taxable Income
for the taxable period, Wireless, as agent for the Wireless Group, shall pay
AT&T the Tax on the Wireless Group's Allocated Taxable Income for the taxable
period and (II) if the Wireless Group has an Allocated Taxable Loss for the
taxable period, AT&T shall pay Wireless, as agent for the Wireless Group, the
amount by which the Hypothetical Common Stock/Wireless Affiliated Group's Taxes
would be reduced for the taxable period by reason of the Wireless Group's
Allocated Taxable Loss.

                  (ii) If the Hypothetical Common Stock/Wireless Affiliated
Group has a consolidated, combined or unitary NOL in such jurisdiction ("State,
Local or Foreign CNOL") for such taxable period, then (I) if the Common Stock
Group and the Wireless Group each have Allocated Taxable Losses, the Tax refund
or other Tax benefit arising from the State, Local or Foreign CNOL (and any
payment from Liberty Group in respect of Liberty Group taxable income in such
jurisdiction calculated on a stand-alone basis with respect to such taxable
period (a "Liberty State, Local or Foreign Tax Sharing Payment")) shall be
shared between the Common Stock Group and the Wireless Group in proportion to
their respective Allocated Taxable Losses for the taxable period, (II) if the
Wireless Group has an Allocated Taxable Loss and the Common Stock Group has
Allocated Taxable Income, then AT&T shall pay Wireless, as agent for the
Wireless Group, the amount by which the Hypothetical Common Stock/Wireless
Affiliated Group's Taxes for the taxable period would be reduced by reason of
the Wireless Group's Allocated Taxable Loss and the Tax refund or other Tax
benefit arising from the State,

                                      -16-
<PAGE>   17
Local or Foreign CNOL (and any Liberty State, Local or Foreign Tax Sharing
Payment) shall be allocated to the Wireless Group and (III) if the Wireless
Group has Allocated Taxable Income and the Common Stock Group has an Allocated
Taxable Loss, then Wireless, as agent for the Wireless Group, shall pay AT&T the
amount by which the Hypothetical Common Stock/Wireless Affiliated Group's Taxes
for the taxable period would be reduced by reason of the Common Stock Group's
Allocated Taxable Loss and the Common Stock Group shall retain the Tax refund or
other Tax benefit arising from the State, Local or Foreign CNOL (and any Liberty
State, Local or Foreign Tax Sharing Payment).

                  (iii) If Section 3.2(b)(ii)(I) applies, then AT&T shall first
carry back the State, Local or Foreign CNOL of the Hypothetical Common
Stock/Wireless Affiliated Group for the taxable period, to the extent permitted
by applicable law, and then shall carry forward such CNOL. Such carryback or
carryforward, as the case may be, shall be treated as applied (a) for each
applicable taxable period in proportion to the respective Allocated Taxable
Losses of the Common Stock Group and the Wireless Group for the taxable period
of the State, Local or Foreign CNOL and (b) beginning with the earliest taxable
period permitted by applicable law. To the extent AT&T obtains a Tax refund or
other Tax benefit arising from such carryback or carryforward (or a Liberty
State, Local or Foreign Tax Sharing Payment), AT&T shall compensate the Wireless
Group for the Tax refund or other Tax benefit received (and any Liberty State,
Local or Foreign Tax Sharing Payment) in an amount which is proportionate to the
Wireless Group's Allocated Taxable Loss included in the State, Local or Foreign
CNOL so applied within ten (10) days of AT&T's receipt of such Tax refund (or
Liberty State, Local or Foreign Tax Sharing Payment) or within ten (10) days of
AT&T's filing the Tax return with respect to which it claims such other Tax
benefit. If the Hypothetical Common Stock/Wireless

                                      -17-
<PAGE>   18
Affiliated Group has a State, Local or Foreign CNOL in a particular jurisdiction
for more than one taxable period, then the foregoing shall apply to each such
CNOL, beginning with the CNOL in the earliest such taxable period. For the
avoidance of doubt, if AT&T obtains no Tax refund or other Tax benefit with
respect to a State, Local or Foreign CNOL described in this paragraph (and no
Liberty State, Local or Foreign Tax Sharing Payment), AT&T shall make no payment
to Wireless in respect of the Wireless Group's Allocated Taxable Loss for the
taxable period of the CNOL.

                  (c) Consolidated Tax Credits. Except as set forth below with
respect to the research and experimentation ("R&E") Tax credit and except as set
forth in paragraph (d)(iii) hereof with respect to consolidated federal AMT
credits, Tax credits will be allocated to each of the Wireless Group and the
Common Stock Group contributing to the credit on a pro rata basis in an amount
equal to such Group's contribution to each consolidated Tax credit determined to
be available to the Hypothetical Common Stock/Wireless Affiliated Group for each
taxable period, except to the extent that the Code or Treasury Regulations
require a different allocation. The contribution of the Wireless Group and the
Common Stock Group to each consolidated Tax credit generally will be determined
without regard to the amount of Tax credit that would have been allowed if a
Separate Return had been filed. In the case of the R&E Tax credit, however, the
total available R&E Tax credit for a taxable period (determined without regard
to any carryovers and carrybacks of R&E tax credits from other taxable periods)
shall be allocated pro rata between the Common Stock Group and the Wireless
Group based on the amount of qualified research expenditures that each such
Group generates during such taxable period and without regard to whether (i)
such Group would have generated a R&E Tax credit on a Separate Return basis; and
(ii) such Group would have been able to utilize a R&E Tax credit on a Separate
Return

                                      -18-
<PAGE>   19
basis. Any Tax credit allocated to the Wireless Group or the Common Stock Group
under subparagraph (c) or subparagraph (d) hereof shall be taken into account in
determining the amount of any payment to be made by the Wireless Group or the
Common Stock Group under Section 3.2 or Section 3.3 hereof.

                  (d) Alternative Minimum Tax.

                  (i) If the Hypothetical Common Stock/Wireless Affiliated Group
has a consolidated federal AMT liability for such taxable period, then (I) if
the Wireless Group has Allocated Taxable Income for AMT purposes ("AMTI"),
Wireless, as agent for the Wireless Group, shall pay AT&T the AMT attributable
to the Wireless Group's AMTI for the taxable period and (II) if the Wireless
Group has an Allocated Taxable Loss for AMT purposes ("AMTL"), AT&T shall pay
Wireless, as agent for the Wireless Group, the amount by which the Hypothetical
Common Stock/Wireless Affiliated Group's AMT liability would be reduced for the
taxable period by reason of the Wireless Group's AMTL.

                  (ii) If the Hypothetical Common Stock/Wireless Affiliated
Group has an NOL for consolidated federal AMT purposes ("AMT NOL") for such
taxable period, then (I) if the Common Stock Group and the Wireless Group each
have AMTLs, the federal AMT refund or other Tax benefit arising from the
consolidated federal AMT NOL (and any payment from the Liberty Group in respect
of Liberty Group alternative minimum taxable income with respect to such taxable
period (a "Liberty AMT Sharing Payment")) shall be shared between the Common
Stock Group and the Wireless Group in proportion to their respective AMTLs for
the taxable period, (II) if the Wireless Group has an AMTL and the Common Stock
Group has AMTI, then AT&T shall pay Wireless, as agent for the Wireless Group,
the amount, if any, by which the Hypothetical Common Stock/Wireless Affiliated
Group's consolidated federal AMT for the

                                      -19-
<PAGE>   20
taxable period would be reduced by reason of the Wireless Group's AMTL and the
federal AMT refund or other Tax benefit arising from the AMT NOL and any Liberty
AMT Sharing Payment shall be allocated to the Wireless Group and (III) if the
Wireless Group has AMTI and the Common Stock Group has an AMTL, then Wireless,
as agent for the Wireless Group, shall pay AT&T the amount, if any, by which the
Hypothetical Common Stock/Wireless Affiliated Group's consolidated federal AMT
for the taxable period would be reduced by reason of the Common Stock Group's
AMTL and the Common Stock Group shall retain the AMT refund or other Tax benefit
arising from the AMT NOL (and any Liberty AMT Sharing Payment).

                  (iii) Any Tax benefit arising from a utilization by the
Hypothetical Common Stock/Wireless Affiliated Group of a consolidated federal
AMT credit shall be allocated to the Group which paid the AMT that generated
such AMT credit. The AMT credit will be treated as used on a "FIFO" basis.

                  (iv) The principles set forth in subparagraphs (i)-(iii) above
shall apply, mutatis mutandis, with respect to any Joint Return for a state,
local or foreign jurisdiction that imposes an AMT, unless otherwise agreed with
or mandated by a specific jurisdiction.

                  (e) Special Rules.

                  (i) Treatment of Certain Preferred Stock and Debt. The $3
billion of 9% cumulative preferred interests issued by AWG to AT&T, the $1.9
billion of AWG indebtedness held by the Common Stock Group and any preferred
stock resulting from a conversion of any portion of such indebtedness (such debt
and preferred, the "Interests") will, for federal, state and local income tax
purposes, be treated as intercompany debt instruments, each with an issue price
equal to its face amount. Notwithstanding the fact that Interests may be
disregarded for U.S. tax purposes, for all purposes of this Agreement (including
the calculation of gain or loss with

                                      -20-
<PAGE>   21
respect to such Interests), such Interests shall be considered assets of the
Common Stock Group and liabilities of the Wireless Group. For the avoidance of
doubt, dividend payments on the preferred stock and interest payments on the
debt will be treated as interest expense to the Wireless Group and interest
income to the Common Stock Group.

                  (ii) Final Adjustment of Intercompany Account; Final
Post-Distribution Tax-Sharing True-Ups. Prior to the Distribution Date, AT&T
shall adjust the intercompany account between AT&T and the Wireless Group to
reflect either party's liability for or right to receive (as the case may be)
any unpaid amount determined under this Agreement with respect to (a) any
taxable period ending on the Distribution Date (such determination to be based
on an accrual, consistent with past practice under Section 3.2 hereof, of the
federal and state income Tax on the Wireless Group's Allocated Taxable Income
(Loss) through the Distribution Date) and (b) any other Pre-Distribution Taxable
Period and any resulting balance in the intercompany account shall be paid. No
later than sixty (60) days after the date that the Tax Return of the AT&T
Affiliated Group that includes a Pre-Distribution Taxable Period is due
(including extensions), (I) AT&T shall determine the differences, if any,
between the taxable income or loss used to calculate any amounts described in
clause (a) of the preceding sentence and the Wireless Group's Allocated Taxable
Income (Loss) determined in connection with filing the consolidated federal
income Tax Return of the AT&T Affiliated Group that includes such
Pre-Distribution Taxable Period, and (II) final tax sharing true-up payments
shall be made by AT&T to the Wireless Group or by the Wireless Group to AT&T, as
the case may be, to reflect the amount of such differences. For the avoidance of
doubt, amounts payable or receivable hereunder shall not include or be impacted
by any amounts treated for financial reporting purposes (i.e., US GAAP and FAS
109) as a deemed equity transaction in order to reconcile the Wireless Group's
tax

                                      -21-
<PAGE>   22
liability to the stand alone tax provision reflected in the Wireless Group
separate company US GAAP financial statements.

                  (iii) Liability for Spin-Off Disqualification. Notwithstanding
anything in this Agreement to the contrary, Wireless' obligation to indemnify
AT&T for any "Tax-Related Losses" as a result of a "Spin-Off Disqualification"
(as those terms are defined in Section 7.2(b) and (d) of the Separation and
Distribution Agreement) shall be determined exclusively under the provisions of
the Separation and Distribution Agreement.

                  (iv) Employee Compensation. The allocation of Tax Items
related to employee compensation and employee benefits between the Common Stock
Group and the Wireless Group shall be determined exclusively under the
provisions of the Employee Benefits Agreement by and between the parties hereto
dated as of the date hereof.

                  (v) Certain Items for Wireless' Account. Any Tax Item
resulting from, arising out of, relating to, in the nature of or caused by any
asset or other interest tracked by the AT&T Wireless Group Tracking Stock shall
be for the account of the Wireless Group as provided hereunder. Without
limitation, and for the avoidance of any doubt, Tax Items arising out of or
relating to the following shall be part of the Allocated Taxable Income (Loss)
of the Wireless Group or, in the case of Non-Income Taxes, shall give rise to a
Non-Income Tax liability for the account of the Wireless Group: (A) the
transactions contemplated by that certain Agreement and Plan of Merger, dated as
of March 3, 2000, by and between AT&T, AT&T Wireless Acquisition I, Inc.,
Comcast Corporation and Comcast WCS Communications, Inc., or any other agreement
entered into in connection therewith, (B) the transactions contemplated by that
certain Investment Agreement, dated as of April 25, 1999, among British
Telecommunications plc, BT (Netherlands) Holdings B.V., AT&T and Japan Telecom
Co., Ltd.

                                      -22-
<PAGE>   23
and the ownership interest in Froghall B.V. arising as a result of that
transaction (limited, in the case of this clause (B) to 50 percent of any such
Tax, as the remainder of Froghall B.V. is an asset of the Common Stock Group),
(C) the treatment of AT&T Wireless Group Tracking Stock as anything other than
common stock of AT&T, (D) the actual or deemed disposition of the Wireless Group
or of the stock or assets of any Legal Entity which is a member of the Wireless
Group arising out of or relating to the issuance of AT&T Wireless Group Tracking
Stock, (E) any distribution of the stock of any company the assets of which are
tracked by the AT&T Wireless Group Tracking Stock or, notwithstanding any other
provision in this Agreement, any transaction undertaken in connection therewith,
(F) the attribution and/or transfer to the Wireless Group of all or a portion
of, as the case may be, AT&T's indirect interests in Binariang SDN BHD, Atlantic
West BV, PT Aria West International, MediaOne BPL JV, Japan Telecom Co., Ltd.,
AT&T BT Canada JV II, Birla Communications Ltd., and any other assets which are
attributed and/or transferred to the Wireless Group, and (G) any transfer of
assets (including interests in entities) or liabilities to Wireless or between
entities that are members of the Wireless Group in a Pre-Distribution Taxable
Period.

                  (vi) Certain Items for AT&T's Account. Any Tax Item resulting
from, arising out of, relating to, in the nature of or caused by any asset or
other interest which is not tracked by the AT&T Wireless Group Tracking Stock
shall be for the account of AT&T. Without limitation, and for the avoidance of
any doubt, Tax Items arising out of or relating to the following shall be part
of the Allocated Taxable Income (Loss) of the Common Stock Group or, in the case
of Non-Income Taxes, shall give rise to a Non-Income Tax liability for the
account of AT&T: (A) a transfer by the Wireless Group of the investment in
Phone.com, Inc., (B) a transfer

                                      -23-
<PAGE>   24
by the Wireless Group of the investment in Metromedia Fiber Network Inc., and
(C) a transfer by the Wireless Group of the investment in Metrocall, Inc.

                  (vii) Other Transactions. Except as otherwise provided in
(iii), (iv), (v) and (vi) hereof, in the case of any other transaction involving
the assets of the Wireless Group or the Common Stock Group, respectively,
undertaken to facilitate a transaction of the Common Stock Group or the Wireless
Group, respectively, AT&T and Wireless shall in good faith negotiate the
appropriate allocation of Tax Items arising in connection with such transaction.

                  (viii) For the avoidance of doubt, any AT&T Common Stock, AT&T
Wireless Tracking Stock or AT&T Liberty Media Group Stock that is outstanding
for Tax purposes and is an asset of the Common Stock Group, the Liberty Media
Group or the Wireless Group (each as defined in the AT&T Charter) under the AT&T
Charter shall be treated as an asset of, and held by a Legal Entity that is a
member of, the Common Stock Group, the Liberty Group or the Wireless Group,
respectively, for purposes of this Agreement.

         3.3. Wireless Tax Sharing Payments with respect to Pre-Closing Taxable
Periods. Except as set forth below, with respect to Pre-Closing Taxable Periods,
Wireless will be responsible for all Taxes attributable to the Wireless Group as
determined under the principles set forth in Section 3.2. The responsibility of
Wireless to pay AT&T for consolidated income Taxes attributable to the Wireless
Group, and AT&T's responsibility to pay Wireless for Tax benefits attributable
to the Wireless Group, will be considered to have been settled for Pre-Closing
Taxable Periods; provided, however, that the principles of this Agreement
(including, without limitation, Sections 3.2(a) and 3.2(b)) shall apply (A) to
the extent that the taxable income or loss used to calculate the consolidated
income Tax asset or liability accruals for Taxes currently payable set forth on
the financial statements of the Wireless Group differ from the

                                      -24-
<PAGE>   25
Wireless Group taxable income or loss reflected in the 1999 income Tax Return of
the AT&T Affiliated Group and (B) to the extent set forth in Section 5 hereof.

         3.4. Wireless Tax Sharing Payments with respect to Post-Distribution
Taxable Periods. With respect to Post-Distribution Taxable Periods, Wireless
will be responsible for all Taxes attributable to the Wireless Group.

         4. Time of Payment; Joint and Several Liability.

                  (a) The payments required pursuant to Section 3.2 or Section
3.3 shall be made on an estimated basis no later than the fifth day after the
date an estimated Tax payment is due (including extensions), and a true-up
payment shall be made no later than sixty (60) days after the date that the Tax
Return for the taxable period is due (including extensions).

                  (b) Every member of the Wireless Group shall be jointly and
severally liable for all obligations of any member of the Wireless Group arising
under this Agreement, and every member of the Common Stock Group shall be
jointly and severally liable for all obligations of any member of the Common
Stock Group arising under this Agreement.

         5. Adjustments.

                  (a) In the event of any redetermination of the consolidated
federal income Tax liability of the AT&T Affiliated Group for any taxable period
(or of a Tax liability with respect to any Joint Return for any taxable period)
as the result of an audit by the Internal Revenue Service (or the relevant
state, local or foreign Governmental Authority), a claim for refund or
otherwise, the Liberty Federal Tax Sharing Payment, the Liberty State, Local or
Foreign Tax Sharing Payment, and the Wireless Group's and Common Stock Group's
respective shares of the Hypothetical Common Stock/Wireless Affiliated Group's
Taxes, shall be recomputed for such taxable period and any prior and subsequent
taxable periods to take into account such

                                      -25-
<PAGE>   26
redetermination, and payments due pursuant to Section 3.2 or Section 3.3 hereof
shall be appropriately adjusted. Notwithstanding anything in this Section to the
contrary, in the event of a redetermination of an income Tax liability reflected
on a state or local combined, consolidated or unitary income or franchise Tax
Return that is a Joint Return for a Pre-Closing Taxable Period, including a
determination that any or all of the members of the Wireless Group or the Common
Stock Group are not entitled to file a Joint Return, such Group's respective
shares of the Hypothetical Common Stock/Wireless Affiliated Group's Taxes, shall
be recomputed under the provisions of the State and Local Income Tax Allocation
Agreement to take into account such redetermination, and payments pursuant to
such agreement shall be appropriately adjusted. For the avoidance of doubt, in
the event of a redetermination of an income Tax liability reflected on a state
or local combined, consolidated or unitary income or franchise Tax Return that
is a Joint Return for a taxable period other than a Pre-Closing Taxable Period
and that results from an adjustment to one or more apportionment factors
(whether arising from an adjustment to the factors of the Wireless Group, the
Common Stock Group or both groups), the liability of both the Common Stock Group
and the Wireless Group shall be recalculated using the revised apportionment
factors (property, payroll, sales), calculated on a consolidated basis.

                  (b) Any payment by AT&T or Wireless required by such
adjustment shall be paid within thirty (30) days after the date of a Final
Determination with respect to such redetermination or as soon as such adjustment
can practicably be calculated, if later.

                  (c) For all Tax purposes, except as otherwise mandated by
applicable law, the parties hereto agree to treat, and to cause their respective
affiliates to treat (i) any payment to a party required by this Agreement as
either a contribution by AT&T to Wireless or a distribution by Wireless to AT&T,
as the case may be, occurring immediately prior to the Distribution and

                                      -26-
<PAGE>   27
(ii) any payment of interest (or non-federal income Taxes) by or to the Internal
Revenue Service (or the relevant state, local or foreign Governmental Authority)
as taxable or deductible, as the case may be, to the party entitled under this
Agreement to retain such payment or required under this Agreement to make such
payment; provided, that in the event it is determined as a result of a Final
Determination that any such treatment described in clause (i) hereof is not
permissible, the payment in question shall be adjusted to place the parties in
the same after-tax position they would have enjoyed absent such Final
Determination.

         6. Separate Returns. Any Separate Return that includes only members of
the Wireless Group and any Taxes with respect to such Separate Return shall be
the responsibility of the Wireless Group, provided, however, that in the event
that the Wireless Group does not timely file such Separate Returns or pay the
Taxes due with respect thereto for any Pre-Distribution Taxable Period, Wireless
shall indemnify AT&T with respect to such Separate Return as provided in Section
8 and, notwithstanding any other provision hereof, AT&T shall be entitled to
file (or cause to be filed) such Separate Return in any manner it chooses in its
sole discretion. For the avoidance of doubt, Wireless shall be responsible for
(i) preparing and filing or causing to be prepared and filed all Tax Returns and
exemption certificates required to be filed by Wireless or any member of the
Wireless Group for any Post-Distribution Taxable Period and (ii) paying the Tax
liability due with respect to such Tax Returns. For the further avoidance of
doubt any liability or overpayment of Non-Income Taxes arising from an audit
conducted by a Governmental Authority with respect to the business activities of
the Wireless Group or the Common Stock Group, respectively, for any
Pre-Distribution Taxable Period, including any liability arising from the
failure to properly collect and remit Telecom Pass Through Taxes, shall be for
the account of the Wireless Group or the Common Stock Group, as the case may be.

                                      -27-
<PAGE>   28
         6A. Carrybacks and Apportionment of Tax Attributes.

             (a) Except to the extent otherwise consented to by AT&T or
prohibited by applicable law, the Wireless Group shall relinquish, waive or
otherwise forego all carrybacks of a Tax attribute (including, without
limitation, a net operating loss, a net capital loss or a Tax credit) by a
member of the Wireless Group from a Post-Distribution Taxable Period to a
Pre-Distribution Taxable Period; provided, however, that A&T will not
unreasonably withhold its consent to a carryback of a significant net operating
loss of the Wireless Group (provided further that the cost of any such carryback
be borne by the Wireless Group)..

             (b) AT&T shall provide to the Wireless Group (i) no later than 90
days prior to the due date for filing (including extensions) the federal income
Tax Return of the AT&T Affiliated Group for the taxable period that includes the
Distribution Date, a schedule setting forth an estimate of all federal, state,
or local consolidated or combined losses, credits and other Tax attributes
allocable to the Wireless Group for Post-Distribution Taxable Periods, and (ii)
no later than 90 days after filing the relevant federal income Tax Return, a
final copy of such schedule, after considering in good faith all comments of the
Wireless Group on the schedule provided pursuant to clause (i). The allocation
of Tax attributes set forth in such schedule shall be binding on the Wireless
Group and, except as otherwise required pursuant to a Final Determination,
neither Wireless nor any member of the Wireless Group shall take a position on
any Tax Return for a Post-Distribution Taxable Period that is inconsistent with
the information contained in such schedule. Wireless shall prepare or cause to
be prepared and file or cause to be filed all income Tax Returns for which it is
responsible under this Agreement so as to take into account, to the extent
permitted by applicable law, any Tax attribute apportioned to Wireless or any
member of the Wireless Group hereunder. Until such time as any such Tax
attribute has

                                      -28-
<PAGE>   29
been utilized by Wireless or any member of the Wireless Group, Wireless shall,
in connection with each income Tax Return filed by or on behalf of a member of
the Wireless Group, provide AT&T with a statement setting forth in reasonable
detail a calculation of the extent to which any such Tax attribute was utilized
on such income Tax Return.

         7. Interest on Unpaid Amounts. In the event that any party fails to pay
any amount owed to another party pursuant to this Agreement on the date when
due, interest shall accrue on any unpaid amount, from the due date until such
amounts are fully paid, at the Designated Rate in effect during that time.

         8.   Indemnification.

                  (a) From and after the Issue Date, each Legal Entity that is a
member of the Wireless Group shall indemnify and hold harmless each Common Stock
Indemnitee from and against (i) any Taxes with respect to a Pre-Distribution
Taxable Period which such member of the Wireless Group is required to pay to a
Governmental Authority (without any right of reimbursement from any Legal Entity
that is not a member of the Wireless Group) or in respect of which Wireless is
required to make a payment to AT&T and (ii) any Losses incurred by any Common
Stock Indemnitee by reason of a breach by any member of the Wireless Group of
its obligations or covenants hereunder.

                  (b) From and after the Issue Date, each Legal Entity that is a
member of the Common Stock Group shall indemnify and hold harmless each Wireless
Indemnitee from and against (i) any Taxes with respect to a Pre-Distribution
Taxable Period which such member of the Common Stock Group is required to pay to
a Governmental Authority (without any right of reimbursement from any Legal
Entity that is not a member of the Common Stock Group) or in respect of which
AT&T is required to make a payment to Wireless and (ii) any Losses incurred

                                      -29-
<PAGE>   30
by any Wireless Indemnitee by reason of a breach by any member of the Common
Stock Group of its obligations or covenants hereunder.

         9.   Tax Proceedings.

                  (a) Notification of Tax Proceedings. The Controlling Party
shall notify all Interested Parties within ten (10) business days of (i) the
commencement of any Tax Proceeding pursuant to which such Interested Parties may
be required to make or entitled to receive an indemnity payment, reimbursement
or other payment under this Agreement; and (ii) as required and specified in
Section 9(d) hereof, any Final Determination made with respect to any Tax
Proceeding pursuant to which such Interested Parties may be required to make or
entitled to receive any indemnity payment, reimbursement or other payment under
this Agreement. The failure of a Controlling Party to timely notify any
Interested Party as specified in the preceding sentence shall not relieve any
such Interested Party of any liability and/or obligation which it may have to
the Controlling Party under this Agreement except to the extent that the
Interested Party was prejudiced by such failure, and in no event shall such
failure relieve the Interested Party from any other liability or obligation
which it may have to such Controlling Party.

                  (b) Tax Proceeding Settlement Rights. The Controlling Party
shall have the sole right to contest, litigate, compromise and settle any
Adjustment that is made or proposed in a Tax Proceeding without obtaining the
prior consent of any Interested Party; provided, however, that unless waived by
the parties in writing, the Controlling Party shall, in connection with any
proposed or assessed Adjustment in a Tax Proceeding for which an Interested
Party may be required to make or entitled to receive an indemnity payment,
reimbursement or other payment under this Agreement (i) keep all such Interested
Parties informed in a timely manner of all actions taken or proposed to be taken
by the Controlling Party; and (ii) provide all such

                                      -30-
<PAGE>   31
Interested Parties with copies of any correspondence or filings submitted to any
Governmental Authority or judicial authority, in each case in connection with
any contest, litigation, compromise or settlement relating to any such
Adjustment in a Tax Proceeding. The failure of a Controlling Party to take any
action as specified in the preceding sentence with respect to an Interested
Party shall not relieve any such Interested Party of any liability and/or
obligation which it may have to the Controlling Party under this Agreement
except to the extent that the Interested Party was prejudiced by such failure,
and in no event shall such failure relieve the Interested Party from any other
liability or obligation which it may have to such Controlling Party. The
Controlling Party may, in its sole discretion, take into account any suggestions
made by an Interested Party with respect to any such contest, litigation,
compromise or settlement of any Adjustment in a Tax Proceeding and shall act in
good faith as if it were the only party in interest. All costs of any Tax
Proceeding are to be borne by the Controlling Party; provided, however, that (x)
any costs related to an Interested Party's attendance at any meeting with a
Governmental Authority or hearing or proceeding before any judicial authority
pursuant to Section 9(c) hereof, and (y) the costs of any legal or other
representatives retained by an Interested Party in connection with any Tax
Proceeding that is subject to the provisions of this Agreement, shall be borne
by such Interested Party.

                  (c) Tax Proceeding Participation. Unless waived by the parties
in writing, the Controlling Party shall provide an Interested Party with written
notice reasonably in advance of, and such Interested Party shall have the right
to attend, any formally scheduled meetings with Governmental Authorities or
hearings or proceedings before any judicial authorities in connection with any
contest, litigation, compromise or settlement of any proposed or assessed
Adjustment that is the subject of any Tax Proceeding pursuant to which such
Interested Party

                                      -31-
<PAGE>   32
may be required to make or entitled to receive an indemnity payment,
reimbursement or other payment under this Agreement. In addition, unless waived
by the parties in writing, the Controlling Party shall provide each such
Interested Party with draft copies of any correspondence or filings to be
submitted to any Governmental Authority or judicial authority with respect to
such Adjustments for such Interested Party's review and comment. The Controlling
Party shall provide such draft copies reasonably in advance of the date that
they are to be submitted to the Governmental Authority or judicial authority and
the Interested Party shall provide its comments, if any, with respect thereto
within in a reasonable time before such submission. The failure of a Controlling
Party to provide any notice, correspondence or filing as specified in this
Section 9(c) to an Interested Party shall not relieve any such Interested Party
of any liability and/or obligation which it may have to the Controlling Party
under this Agreement except to the extent that the Interested Party was
prejudiced by such failure, and in no event shall such failure relieve the
Interested Party from any other liability or obligation which it may have to
such Controlling Party.

                  (d) Tax Proceeding Waiver.

                  (i) The Controlling Party shall promptly provide written
notice, sent postage prepaid by United States mail, certified mail, return
receipt requested, to all Interested Parties in a Tax Proceeding (A) that a
Final Determination has been made with respect to such Tax Proceeding; and (B)
enumerating the amount of the Interested Party's share of each Adjustment
reflected in such Final Determination of the Tax Proceeding for which such
Interested Party may be required to make or entitled to receive an indemnity
payment, reimbursement or other payment under this Agreement.

                                      -32-
<PAGE>   33
                  (ii) Within ninety (90) days after an Interested Party
receives the notice described in Section 9(d)(i) hereof from the Controlling
Party, such Interested Party shall execute a written statement giving notice to
the Controlling Party (A) that the Interested Party agrees with each Adjustment
(and its share thereof) enumerated in the notice described in Section 9(d)(i)
hereof except with respect to those Adjustments (and/or its shares thereof)
that, in the good faith judgment of the Interested Party, it disagrees with and
has specifically enumerated its disagreement with, including the amount of such
disagreement, in the statement (each such disagreed Adjustment (and/or share
thereof) hereinafter referred to as a "Disputed Adjustment"); and (B) that the
Interested Party thereby waives its right to a determination by an Independent
Third Party pursuant to the provisions of Section 9(e) hereof with respect to
all Adjustments to which it agrees with its share (the "Interested Party
Notice"). The failure of an Interested Party to provide the Interested Party
Notice to the Controlling Party within the ninety (90) day period specified in
the preceding sentence shall be deemed to indicate that such Interested Party
agrees with its share of all Adjustments enumerated in the notice described in
Section 9(d)(i) hereof and that such Interested Party waives its right to a
determination by an Independent Third Party with respect to all such Adjustments
(and its shares thereof) pursuant to Section 9(e) hereof.

                  (iii) During the ninety (90) day period immediately following
the Controlling Party's receipt of the Interested Party Notice described in
Section 9(d)(ii) above, the Controlling Party and the Interested Party shall in
good faith confer with each other to resolve any disagreement over each Disputed
Adjustment that was specifically enumerated in such Interested Party Notice. At
the end of the ninety (90) day period specified in the preceding sentence,
unless otherwise extended in writing by the mutual consent of the parties, the
Interested Party shall be deemed to agree with all Disputed Adjustments that
were specifically enumerated in the

                                      -33-
<PAGE>   34
Interested Party Notice and waive its right to a determination by an Independent
Third Party pursuant to Section 9(e) hereof with respect to all such Disputed
Adjustments unless, and to the extent that, at any time during such ninety (90)
day (or extended) period, either the Controlling Party or the Interested Party
has given the other party written notice that it is seeking a determination by
an Independent Third Party pursuant to Section 9(e) hereof regarding the
propriety of any such Disputed Adjustment.

                  (e) Tax Proceeding Dispute Resolution.

                  (i) In the event that either a Controlling Party or an
Interested Party has given the other party written notice as required in Section
9(d)(iii) hereof that it is seeking a determination by an Independent Third
Party pursuant to this Section 9(e) with respect to any Disputed Adjustment that
was enumerated in an Interested Party Notice, then the parties shall, within ten
(10) days after a party has received such notice, jointly select an Independent
Third Party to make such determination. In the event that the parties cannot
jointly agree on an Independent Third Party to make such determination within
such ten (10) day period, then the Controlling Party and the Interested Party
shall each immediately select an Independent Third Party and the Independent
Third Parties so selected by the parties shall jointly select, within ten (10)
days of their selection, another Independent Third Party to make such
determination.

                  (ii) In making its determination as to the propriety of any
Disputed Adjustment, the Independent Third Party selected pursuant to Section
9(e)(i) above shall assume that the Interested Party is not required or entitled
under applicable law to be a member of any consolidated return. In addition, the
Independent Third Party shall make its determination according to the following
procedure:

                                      -34-
<PAGE>   35
                            (I) The Independent Third Party shall first analyze
each Disputed Adjustment for which a determination is sought pursuant to this
Section 9(e) on a stand alone basis to determine whether the actual outcome
reached with respect to such Disputed Adjustment as reflected in the Final
Determination of the Tax Proceeding was fair and appropriate taking into account
the following exclusive criteria: (A) the facts relating to such Adjustment; (B)
the applicable law, if any, with respect to such Adjustment; (C) the position of
the applicable Governmental Authority with respect to compromise, settlement or
litigation of such Adjustment; (D) the strength of the factual and legal
arguments made by the Controlling Party in reaching the outcome with respect to
such Adjustment as reflected in the Final Determination of the Tax Proceeding;
and (E) the strength of the factual and legal arguments being made by the
Interested Party for the alternative outcome being asserted by such Interested
Party (including the availability of facts, information and documentation to
support such alternative outcome). Based on this analysis, the Independent Third
Party shall determine what is the fair and appropriate outcome (hereinafter
referred to as the "Initial Determination") with respect to each such Disputed
Adjustment.

                           (II) The Interested Party shall not be entitled to
modification of its share of a Disputed Adjustment under this Section 9(e) if,
as the case may be, either (A) the amount that would be paid by the Interested
Party under the Initial Determination with respect to such Disputed Adjustment
is 80% or more than the amount that would be paid by the Interested Party with
respect to such Disputed Adjustment under the actual outcome reached with
respect to such Disputed Adjustment; or (B) the amount that would be received by
the Interested Party under the Initial Determination with respect to such
Disputed Adjustment is 120% or less than the amount that the Interested Party
would receive with respect to such Disputed Adjustment

                                      -35-
<PAGE>   36
under the actual outcome reached with respected to such Disputed Adjustment. The
Independent Third Party will provide notice to the Controlling Party and the
Interested Party in the event the Interested Party is not entitled to
modification of its share of the Disputed Adjustment pursuant to this paragraph
(II).

                           (III) If the modification of an Interested Party's
share of a Disputed Adjustment under this Section 9(e) is not prohibited
pursuant to paragraph (II) above, then the independent Third Party shall
determine what is the fair and appropriate outcome (hereinafter referred to as
the "Ultimate Determination") to the Interested Party with respect to such
Disputed Adjustment in the context of the entire Tax Proceeding as it relates to
the Interested Party. In making this determination, the Independent Third Party
shall consider the Disputed Adjustment as if it were raised in an independent
audit of the Interested Party by the appropriate Governmental Authority and the
Independent Third Party shall take into account and give appropriate weight in
its sole discretion to the following exclusive criteria: (A) the strength of the
legal and factual support for other potential, non-frivolous Adjustments with
respect to matters that were actually raised and contested by the applicable
Governmental Authority in the Tax Proceeding for which the Interested Party
could have been liable under this Agreement but which were eliminated or reduced
as a result of the Controlling Party agreeing to the Disputed Adjustment as
reflected in the Final Determination of the Tax Proceeding; (B) the effect of
the actual outcome reached with respect to the Disputed Adjustment on other
Taxable periods and on other positions taken or proposed to be taken in Returns
filed or proposed to be filed by the Interested Party; (C) the realistic
possibility of avoiding examination of potential, non-frivolous issues for which
the Interested Party could be liable under this Agreement and that were
contemporaneously identified in writings by the party or parties during the
course of the Tax

                                      -36-
<PAGE>   37
Proceeding but which had not been raised and contested by the applicable
Governmental Authority in the Tax Proceeding; and (D) the benefits to the
Interested Party in reaching a Final Determination, and the strategy and
rationale with respect to the Interested Party's Disputed Adjustment that the
Controlling Party had for agreeing to such Disputed Adjustment in reaching the
Final Determination, in each case that were contemporaneously identified in
writings by the party or parties during the course of the Tax Proceeding.

                           (IV) The Interested Party shall only be entitled to
modification of its share of a Disputed Adjustment under this Section 9(e) if,
as the case may be, either (A) the amount that would be paid by the Interested
Party under the Ultimate Determination with respect to such Disputed Adjustment
is less than 80% of the amount that would be paid by the Interested Party with
respect to such Disputed Adjustment under the actual outcome reached with
respect to such Disputed Adjustment; or (B) the amount that would be received by
the Interested Party under the Ultimate Determination with respect to such
Disputed Adjustment is more than 120% of the amount that the Interested Party
would receive with respect to such Disputed Adjustment under the actual outcome
reached with respect to such Disputed Adjustment. If an Interested Party is
entitled to modification of its share of any Disputed Adjustment under the
preceding sentence, the amount the Interested Party is entitled to receive, or
is required to pay, as the case may be, with respect to such Disputed Adjustment
shall be equal to the amount of the Ultimate Determination of such Disputed
Adjustment. The Independent Third Party will provide notice to the Controlling
Party and the Interested Party stating whether the Interested Party is entitled
to modification of its share of the Disputed Adjustment pursuant to this
paragraph (IV) and, if the Interested Party is entitled to such modification,
the amount as determined in the preceding

                                      -37-
<PAGE>   38
sentence that the Interested Party is entitled to receive from, or required to
pay to, the Controlling Party with respect to such Disputed Adjustment.

                  (iii) Any determination made or notice given by an Independent
Third Party pursuant to this Section 9(e) shall be (A) in writing; (B) made
within sixty (60) days following the selection of the Independent Third Party as
set forth in Section 9(e)(i) of this Agreement unless such period is otherwise
extended by the mutual consent of the parties; and (C) final and binding upon
the parties. The costs of any Independent Third Party retained pursuant to this
Section 9(e) shall be shared equally by the parties. The Controlling Party and
the Interested Party shall provide the Independent Third Party jointly selected
pursuant to Section 9(e)(i) hereof with such information or documentation as may
be appropriate or necessary in order for such Independent Third Party to make
the determination requested of it. Upon issuance of an Independent Third Party's
notice under Section 9(e)(ii)(II) or Section 9(e)(ii)(IV) hereof, the
Controlling Party or the Interested Party, as the case may be, shall pay as
specified in Section 5 of this Agreement, the amount, if any, of the Disputed
Adjustment to the appropriate party.

         10. Appointment of AT&T as Agent. Each of AWG, Wireless, Wireless PCS,
the Other Signatories, each of their respective Subsidiaries and any entities
which become parties hereto pursuant to Section 21 hereof (collectively, the
"Wireless Parties") hereby appoints AT&T (or its designee) as its agent for the
purpose of filing consolidated federal income Tax returns and for making any
election or application or taking any action in connection with any such return
on behalf of any of the Wireless Parties for any Pre-Distribution Taxable Period
consistent with the terms of this Agreement. Each of the Wireless Parties hereby
appoints AT&T (or its designee) as its agent for the purpose of filing any
combined, consolidated or unitary state, local or foreign Tax returns that
includes any Legal Entity that is a member of the Wireless Group, and for

                                      -38-
<PAGE>   39
making any election or application or taking any action in connection with any
such return on behalf of any of the Wireless Parties for any Pre-Distribution
Taxable Period consistent with the terms of this Agreement. Each of the Wireless
Parties hereby consents to the filing of such consolidated federal income Tax
returns and combined, consolidated or unitary state, local or foreign Tax
Returns, and to the making of such elections and applications. Each of the
Wireless Parties agrees that each of the Wireless Parties that is or becomes a
corporation for federal income Tax purposes shall be included in the filing of
consolidated federal income Tax Returns on behalf of the AT&T Affiliated Group
for each Pre-Distribution Taxable Period during which such Wireless Party is a
corporation for federal income Tax purposes.

         11.  Cooperation, Exchange of Information and Payment of Tax.

                  (a) Cooperation. The parties shall cooperate with one another
in all matters relating to Taxes.

                  (b) Exchange of Information.

                  (i) The Wireless Group shall, at its sole cost and expense,
provide AT&T with such cooperation and information as is necessary in order to
enable AT&T to satisfy its Tax, accounting and other legitimate requirements
with respect to Pre-Distribution Taxable Periods. Such cooperation and
information by the Wireless Group shall include making available its respective
knowledgeable employees during normal business hours, providing the information
required by AT&T's customary Tax and accounting practices, including
questionnaires (at the times and in the format required by AT&T or its
Subsidiaries), providing complete Tax Return work papers and supporting
documentation prepared in a manner that is reasonably consistent with AT&T's
past practice, maintaining such books and records and providing such information
as may be necessary or useful in the filing of Joint Returns and

                                      -39-
<PAGE>   40
Separate Returns, and executing any documents and taking any actions which AT&T
may reasonably request in connection therewith. With respect any
Pre-Distribution Taxable Period, the Wireless Group shall provide the
information required hereunder no later than 120 days after the Distribution
Date.

                  (ii) In the event the Wireless Group desires to take any
position on a Joint Return for a Pre-Distribution Taxable Period with respect to
a specific Tax Item that is directly inconsistent with a position taken on a
previously filed Tax Return of or which included a member of the Wireless Group
for a Pre-Distribution Taxable Period (an "Inconsistent Position") it shall
notify AT&T of that desire. If the Inconsistent Position solely relates to the
Wireless Group's line of business and is not relevant for the Common Stock Group
(a "Wireless Inconsistent Position"), the Wireless Group shall provide to AT&T,
at least (90) days prior to the due date (with extensions) of the relevant Joint
Return, information sufficient to establish that such Wireless Inconsistent
Position would have a likelihood of success under the law that is at least
33-1/3 percent (the "Reporting Standard"). Within thirty (30) business days of
receipt of such information, AT&T shall notify the Wireless Group in writing (a)
if such information is not reasonably satisfactory to AT&T or (b) if AT&T, in
its sole discretion, determines that the Wireless Inconsistent Position could
reasonably be expected to have an adverse effect on AT&T. The item will be
reported by AT&T in accordance with AT&T's past practice unless, within ten
business days of receipt of the written notice described in clause (a) of the
preceding sentence, the Wireless Group provides AT&T with an opinion of a
nationally recognized law firm confirming, in form and substance reasonably
satisfactory to AT&T, that the Wireless Inconsistent Position would meet the
Reporting Standard. Any expenses related to obtaining such an opinion shall be
borne by the Wireless Group. For the avoidance of doubt, if the

                                      -40-
<PAGE>   41
Wireless Group requests that AT&T take an Inconsistent Position (which is not a
Wireless Inconsistent Position) with respect to a Wireless Group item, AT&T may
determine in its sole discretion (and without regard to the procedures in this
subsection (ii)) whether to report any Wireless Group Tax Item which is an
Inconsistent Position (and not a Wireless Inconsistent Position) in accordance
with the request of the Wireless Group

                  (iii) In any Tax Return for a Post-Distribution Taxable
Period, the Wireless Group agrees to act in good faith in reporting its Tax
Items and not to claim any deduction, refund or credit which has been claimed
(or which in accordance with past practice will be claimed) on a Tax Return of
or which included a member of the Wireless Group for a Pre-Distribution Taxable
Period , except as required as a result of a Final Determination.

                  (iv) AT&T, at its election and expense, shall be permitted to
retain an Independent Third Party to review the information provided by the
Wireless Group pursuant to subsection (b)(i) or (b)(ii), as the case may be, for
completeness and accuracy, and to determine whether such information is
consistent with AT&T's past practice or, to the extent it relates to a Wireless
Inconsistent Position, sufficient to satisfy the Reporting Standard. The
Wireless Group shall cooperate fully with such third-party review and shall make
available any of the information described in subsection (b)(i) or (b)(ii), as
the case may be, as reasonably requested by AT&T or its representatives.

                  (v) AT&T shall provide Wireless, upon request, with copies of
relevant portions of relevant Joint Returns (or, at AT&T's discretion, pro
formas of such Joint Returns showing only Wireless Group Tax Items) filed by
AT&T that include any member of the Wireless Group promptly after such Joint
Returns are filed.

                                      -41-
<PAGE>   42
                  (c) Payment of Tax. For each Pre-Distribution Taxable Period,
AT&T shall (i) prepare and file, or cause to be prepared and filed and (ii)
timely pay or discharge, or cause to be timely paid or discharged, the
consolidated Federal income Tax liability of the AT&T Affiliated Group for such
taxable period and the combined state, local or foreign Tax liability shown on
any Joint Return that AT&T or any other member of the Common Stock Group elects
or is required to file.

         12. Resolution of Disputes. Except as otherwise expressly provided
herein, any dispute concerning the calculation or basis of determination of any
payment provided for hereunder, including payments under Section 15 hereof,
shall be resolved by an Independent Third Party selected in a manner similar to
the procedure set forth in Section 9(e) (i), whose judgment shall be conclusive
and binding upon the parties, in the absence of mathematical error.

         13. Binding Effect; Successors and Assigns. This Agreement shall be
binding upon AT&T and the Wireless Parties. This Agreement shall inure to the
benefit of, and be binding upon, any successors or assigns of the parties hereto
(including, without limitation, any Subsidiary that becomes a party hereto
pursuant to Section 21). AT&T, Wireless, and each other party hereto may assign
their right to receive payments under this Agreement but may not assign or
delegate their obligations hereunder.

         14. Interpretation. This Agreement is intended to calculate and
allocate certain Federal, state, local and foreign Tax liabilities of the
members of the AT&T Affiliated Group, the Common Stock Group, and the Wireless
Group, and any situation or circumstance concerning such calculation and
allocation that is not specifically contemplated hereby or provided for herein
shall be dealt with in a manner consistent with the underlying principles of
calculation and allocation in this Agreement.

                                      -42-
<PAGE>   43
         15. Legal and Accounting Fees. Except as otherwise provided in Section
11 hereof, any fees or expenses for legal, accounting or other professional
services rendered in connection with the preparation of a Joint Return or the
conduct of any Tax Proceeding shall be allocated between AT&T and Wireless in a
manner resulting in AT&T and Wireless, respectively, bearing a reasonable
approximation of the actual amount of such fees or expenses hereunder reasonably
related to, and for the benefit of, their respective Groups.

         16. Effect of the Agreement. This Agreement shall determine the
liability of AT&T, Wireless and the members of their respective Groups to each
other as to the matters provided for herein, whether or not such determination
is effective for purposes of the Code or of state, local or foreign Tax laws, or
for financial reporting purposes or for any other purposes.

         17.  Entire Agreement.

                  (a) This Agreement embodies the entire understanding among the
parties relating to its subject matter and supersedes and terminates any prior
agreements and understandings among the parties with respect to such subject
matter. Any and all prior correspondence, conversations and memoranda are merged
herein and shall be without effect hereon. No promises, covenants or
representations of any kind, other than those expressly stated herein, have been
made to induce either party to enter into this Agreement. This Agreement,
including this provision against oral modification, shall not be modified or
terminated except by a writing duly signed by each of the parties hereto, and no
waiver of any provisions of this Agreement shall be effective unless in a
writing duly signed by the party sought to be bound.

                  (b) Notwithstanding Section 17(a), (i) the State and Local
Income Tax Allocation Agreement shall remain fully in effect with respect to any
Adjustments under Section 5 of this Agreement that relates to a state or local
combined, consolidated or unitary income or franchise

                                      -43-
<PAGE>   44
Tax Return that is a Joint Return for any Pre-Closing Taxable Period, (ii) the
Federal Tax Allocation Agreement and the State and Local Income Tax Allocation
Agreement shall remain fully in effect with respect to all Legal Entities that
are members of the Common Stock Group, (iii) the Tax Sharing Agreement by and
among AT&T, Lucent Technologies Inc. and NCR Corporation dated as of February 1,
1996, shall remain fully in effect, (iv) the Tax Sharing Agreement between AT&T
and Liberty Media Corporation dated as of March 9, 1999, as amended, shall
remain fully in effect and (v) the Separation and Distribution Agreement shall
remain fully in effect.

         18. Code References. Any references to the Code or Treasury Regulations
shall be deemed to refer to the relevant provisions of any successor statute or
regulation and shall refer to such provisions as in effect from time to time.

         19. Notices. Any payment, notice or communication required or permitted
to be given under this Agreement shall be in writing (including telecopy
communication) and mailed, telecopied or delivered:

                  If to AT&T:

                  AT&T Corp.
                  295 North Maple Avenue
                  Basking Ridge, New Jersey 07920
                  Attention: Vice President--Law and Secretary

                  If to Wireless:

                  AT&T Wireless Services, Inc.
                  7277 164th Avenue NE
                  Redmond, Washington 98052
                  Attention: General Counsel

or to any other address as a AT&T or Wireless shall furnish in writing to one
another. All such notices and communications shall be effective when received.

                                      -44-
<PAGE>   45
         20. Counterparts. This Agreement may be executed in two 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.

         21. New Members. Each of the parties to this Agreement recognizes that
from time to time, new Subsidiaries of AT&T, AWG, Wireless, Wireless PCS or the
Other Signatories may be added to the Wireless Group. Each of the parties agrees
that any such new Subsidiary shall, without the express written consent of the
other parties, become a party to this Agreement for all purposes of this
Agreement with respect to taxable periods ending after such Subsidiary was added
to the Wireless Group, and, with respect to Separate Returns, prior taxable
periods.

         22. Nature of Obligations. Each of AT&T and Wireless acknowledges and
agrees that its respective obligations under this Agreement shall not be
affected by any impossibility, illegality, impracticability, frustration of
purpose, force majeure, act of government, bankruptcy or insolvency of any party
to this Agreement, failure or refusal of any party to this Agreement to perform
its obligations hereunder, dispute, setoff or counterclaim, change in amount,
composition or terms of the assets, liabilities or equity of AT&T or Wireless or
any other party to this Agreement, or any other defense or right which AT&T or
Wireless or any other party to this Agreement has or may have that might have
the effect of releasing AT&T or Wireless or any other party to this Agreement as
the case may be, from such obligations.

         23. Parent Restructuring. Wireless recognizes and agrees, for itself
and on behalf of the members of the Wireless Group, that the Parent Group (as
defined in the Separation and Distribution Agreement) contemplates a
Restructuring (as defined below) in a series of transactions. In connection with
the Restructuring or any part thereof, notwithstanding anything herein to the
contrary, Parent shall be entitled to assign all or any portion of its rights
and

                                      -45-
<PAGE>   46
obligations under this Agreement to any other entity resulting from the
Restructuring or any part thereof, provided however that, at the time of such
assignment, Parent reasonably determines that the assignee is operationally and
financially capable of performing the assigned obligations. In each case, the
applicable entity or entities will assume the related obligations set forth in
this Agreement. In the case of any of the foregoing, effective upon any such
assumption, and without any further action required by the parties hereto,
Parent and the applicable members of the Parent Group shall automatically be
fully released and discharged with respect to the assigned obligations. Parent
will give Wireless written notice of the terms of any assignment pursuant to
this Section at least 10 days prior to the effectiveness thereof. For purposes
hereof, the term "Restructuring" shall mean the various restructuring plans
announced by Parent on October 25, 2000 and thereafter, and any amendments,
modifications or adjustments thereto, whereby generally Parent would split-off
the AT&T Wireless Group from Parent; distribute all the stock it holds in
Liberty Media Corporation in exchange for all the outstanding shares of Liberty
Media Group Tracking Stock; fully separate, or issue separate tracking stocks
intended to reflect the financial performance and economic value of, each of
Parent's other major units: AT&T Broadband, AT&T Business Services and AT&T
Consumer Services; and engage in a number of related activities in connection
therewith, including any potential combinations with one or more third parties
involving any of the entities resulting from the foregoing (which third parties
shall be deemed entities resulting from the Restructuring for purposes hereof)
and including any of the deleveraging activities such as the disposition of
AT&T's ownership interests in various cable properties and investments. In the
event that either Parent or Wireless desires to make any other assignment of all
or any portion of its obligations (or the obligations of any member of its
Group) under this Agreement, neither party may do so without the consent of

                                      -46-
<PAGE>   47
the other, such consent not to be unreasonably withheld. In any such event,
effective upon any such assumption, and without any further action required by
the parties hereto, the applicable assignor and the applicable members of its
Group shall automatically be fully released and discharged with respect to the
assigned obligations.

         24. Termination. This Agreement shall terminate at such time as all
obligations and liabilities of the parties hereto have been satisfied. The
obligations and liabilities of the parties arising under this Agreement shall
continue in full force and effect until all such obligations have been met and
such liabilities have been paid in full, whether by expiration of time,
operation of law, or otherwise. The obligations and liabilities of each party
are made for the benefit of, and shall be enforceable by, the other parties and
their successors and permitted assigns.

                                      -47-
<PAGE>   48
                  IN WITNESS WHEREOF, each of the parties has caused this
Agreement to be executed by its respective duly authorized officer as of the
date first set forth above.

                              AT&T CORP.

                              By: /s/ Ephraim M. Brecher
                                 -------------------------------------
                              Name: Ephraim M. Brecher
                              Title: Vice President Taxes & Tax Counsel

                              AWG LLC

                              By: /s/ Joseph McCabe Jr.
                                 -------------------------------------
                              Name: Joseph McCabe Jr.
                              Title: CFO

                              AT&T WIRELESS SERVICES, INC.
                                on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                 -------------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General
                                     Counsel and Assistant Secretary

                              AT&T WIRELESS PCS, LLC
                               on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                 -------------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General
                                     Counsel and Assistant Secretary

                                      -48-
<PAGE>   49

                              AT&T CELLULAR SERVICES, INC.
                                on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                  ---------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General Counsel
                                     and Assistant Secretary

                              AT&T WIRELESS ACQUISITIONS 1, INC.
                                on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                  ---------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General Counsel
                                     and Assistant Secretary

                              AT&T WIRELESS INTERESTS, INC.
                                on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                  ---------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General Counsel
                                     and Assistant Secretary

                              LOUISIANA MOBILE SYSTEMS, INC.
                                on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                  ---------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General Counsel
                                     and Assistant Secretary

                              MCCAW CELLULARCOMMUNICATIONS, INC.
                                on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                  ---------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General Counsel
                                     and Assistant Secretary

                              NEVADA COUNTY CELLULAR CORPORATION
                                on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                  ---------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General Counsel
                                     and Assistant Secretary

                              WINSTON, INC.
                                on behalf of itself and each of its Subsidiaries

                                      -49-
<PAGE>   50

                              By: /s/ J. Walter Hyer, III
                                  ---------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General Counsel
                                     and Assistant Secretary

                              AT&T WIRELESS ASSET MANAGEMENT, LLC
                                on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                  ---------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General Counsel
                                     and Assistant Secretary

                              AWS NATIONAL ACCOUNTS, LLC
                                on behalf of itself and each of its Subsidiaries

                              By: /s/ J. Walter Hyer, III
                                  ---------------------------------
                              Name: J. Walter Hyer, III
                              Title: Vice President, Associate General Counsel
                                     and Assistant Secretary

                                      -50-

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