Document:

Exhibit 10.1
                                                                    ------------

                         SECURITIES PURCHASE AGREEMENT,

                          dated as of December 20, 2000

                                  by and among

                                   AT&T CORP.,

                          AT&T WIRELESS SERVICES, INC.

                                       and

                                NTT DOCOMO, INC.

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                                TABLE OF CONTENTS

                  ARTICLE I   ISSUANCE AND SALE OF SECURITIES
       Section 1.1  Issuance and Sale of Shares                                2
       Section 1.2  Closing; Closing Deliveries                                2

                  ARTICLE II   REPRESENTATIONS AND WARRANTIES
       Section 2.1  Representations and Warranties of AT&T and
                    AT&T Wireless                                              4
       Section 2.2  Representations and Warranties of DoCoMo                  14
       Section 2.3  Additional Representations and Warranties of
                    DoCoMo and/or Designees                                   17
       Section 2.4  Representations and Warranties of the Designees           17

                            ARTICLE III   COVENANTS
       Section 3.1  Cooperation and Access                                    17
       Section 3.2  Conduct of Business                                       17
       Section 3.3  Certificate of Amendment                                  19
       Section 3.4  Proceeds                                                  19
       Section 3.5  Listing of Shares                                         19
       Section 3.6  Commercially Reasonable Efforts;
                    Government Approvals                                      19
       Section 3.7  Adjustment of the Allocation Fraction                     20
       Section 3.8  Further Assurances; Spin-off                              21

                            ARTICLE IV   CONDITIONS

       Section 4.1  Conditions to Obligations of the Parties                  22
       Section 4.2  Conditions to the Obligations of DoCoMo                   22
       Section 4.3  Conditions to the Obligations of AT&T
                    and AT&T Wireless                                         23

                            ARTICLE V   TERMINATION
       Section 5.1  Grounds for Termination                                   24
       Section 5.2  Effect of Termination                                     25

                       ARTICLE VI   INDEMNIFICATION
       Section 6.1  Indemnification Obligations of AT&T and
                    AT&T Wireless                                             25
       Section 6.2  DoCoMo's Indemnification Obligations                      26
       Section 6.3  Limitations on Indemnity                                  26
       Section 6.4  Method of Asserting Claims, etc.                          27
       Section 6.5  Exclusive Remedy; Survival                                28

                       ARTICLE VII   CERTAIN DEFINITIONS
       Section 7.1  Certain Definitions                                       29

                                      -i-

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       Section 7.2  Interpretation                                            35

                         ARTICLE VIII   MISCELLANEOUS
       Section 8.1  Amendments                                                36
       Section 8.2  Assignment                                                36
       Section 8.3  Notices                                                   36
       Section 8.4  Severability                                              38
       Section 8.5  Counterparts                                              38
       Section 8.6  Governing Law                                             38
       Section 8.7  Entire Agreement                                          39
       Section 8.8  Publicity                                                 39
       Section 8.9  Expenses                                                  39
       Section 8.10 No Third Party Beneficiaries                              39
       Section 8.11 Arbitration                                               39
       Section 8.12 Submission to Jurisdiction; Waivers                       41
       Section 8.13 Waiver of Immunity                                        42
       Section 8.14 Waiver of Jury Trial                                      42
       Section 8.15 Termination of Certain Obligations                        42

                                      -ii-

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EXHIBITS
--------

EXHIBIT A       Form of Certificate of Amendment
EXHIBIT B       Form of Warrant Agreement
EXHIBIT C       AT&T Certificate of Incorporation
EXHIBIT D       AT&T By-laws
EXHIBIT E       AT&T Wireless Certificate of Incorporation
EXHIBIT F       AT&T Wireless By-laws
SCHEDULE 1.2(c) Bank Account
SCHEDULE 2.1 - AT&T and AT&T Wireless Disclosure Schedules
SCHEDULE 2.2 - DoCoMo Disclosure Schedules

                                     -iii-

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                          SECURITIES PURCHASE AGREEMENT

          THIS SECURITIES PURCHASE AGREEMENT (this "Agreement"), dated as of
December 20, 2000, is made by and among NTT DoCoMo, Inc., a corporation
organized under the laws of Japan ("DoCoMo"), AT&T Corp., a New York corporation
("AT&T"), and AT&T Wireless Services, Inc., a Delaware corporation and a
wholly-owned subsidiary of AT&T ("AT&T Wireless").

                              W I T N E S S E T H:

          WHEREAS, AT&T, AT&T Wireless and DoCoMo have entered into a Letter
Agreement, dated November 30, 2000 (including the Term Sheet and other schedules
and attachments thereto, the "Letter Agreement"), that sets forth the agreements
among the parties for an investment by DoCoMo in the Wireless Group and, after
the Spin-off, in AT&T Wireless, and a related mobile multimedia alliance;

          WHEREAS, the Investment consists of the purchase by DoCoMo or one or
more Designees as provided herein of (i) shares of Wireless Group Preferred
Tracking Stock, par value $1.00 per share (the "New Tracking Stock"), of AT&T
having the terms set forth in the form of Certificate of Amendment with respect
thereto attached as Exhibit A hereto (the "Certificate of Amendment") and which
are convertible into shares of Wireless Group Common Stock, par value $1.00 per
share (the "Current Wireless Tracking Stock"), of AT&T and which, in connection
with the Spin-off, to the extent not previously converted will be converted into
shares of Current Wireless Tracking Stock which shares of Current Wireless
Tracking Stock will then immediately be converted into or redeemed and exchanged
for shares of Common Stock, par value $0.01 per share (the "AT&T Wireless Common
Stock"), of AT&T Wireless and (ii) warrants of AT&T Wireless to acquire shares
of New Tracking Stock or shares of Current Wireless Tracking Stock, as the case
may be, which, if not exercised prior to the Spin-off, will automatically be
exchanged for warrants to acquire shares of AT&T Wireless Common Stock upon
consummation of the Spin-off, in each case to be issued pursuant to the Warrant
Agreement (the "Warrants," and together with the New Tracking Stock, the
"Securities"); and

          WHEREAS, the Letter Agreement contemplates that the agreements
contained therein would be superseded by definitive agreements, including (1)
this Agreement, (2) the Warrant Agreement and (3) the Investor Agreement.

<PAGE>

          NOW THEREFORE, in consideration of the premises and of the respective
representations, warranties, covenants and conditions contained herein, the
parties hereto agree as follows:

                                    ARTICLE I

                         ISSUANCE AND SALE OF SECURITIES

          Section 1.1 ISSUANCE AND SALE OF SHARES. Upon the terms and subject to
the conditions of this Agreement, in reliance upon the representations and
warranties hereinafter set forth, and except as provided in Section 1.2 with
respect to a possible earlier required funding with respect to a portion of the
Investment, on the Closing Date AT&T shall issue, sell and deliver to DoCoMo or
one or more Designees, and DoCoMo or one or more Designees shall purchase from
AT&T, 812,511.778 shares of New Tracking Stock and AT&T Wireless shall issue,
sell and deliver to DoCoMo or one or more Designees, and DoCoMo and one or more
Designees shall purchase from AT&T Wireless, Warrants representing the right to
purchase an aggregate of 83,496.546 shares of New Tracking Stock, in each case
free and clear of all Liens for an aggregate purchase price of $9,811,079,720 in
cash to be paid in full to AT&T (the "Purchase Price") of which $264,066,328
will be attributable to the Warrants.

          Section 1.2 CLOSING; CLOSING DELIVERIES.

          (a) The consummation of the transactions contemplated hereby (the
"Closing") shall take place, subject to the satisfaction or waiver of all
conditions to the Closing set forth in Article IV hereof, at the offices of
Wachtell, Lipton, Rosen & Katz, 51 West 52nd Street, New York City, at 8:00 a.m.
New York City time, on the later to occur of (i) January 22, 2001 and (ii) as
promptly as practicable (but no more than four (4) Business Days) following the
first date on which all conditions set forth in Article IV have been satisfied
or waived (other than those conditions that by their nature are to be satisfied
by actions taken at the Closing, which must be satisfied or waived at the
Closing); provided that, in the event that AT&T Wireless provides the
certificate contemplated by Section 1.2(b) hereof, the Closing shall take place
on the day prior to the date the relevant spectrum acquisition funding is
required as specified in such certificate and subject to the satisfaction or
waiver of all conditions to the Closing set forth in Article IV hereof; PROVIDED
FURTHER that in no circumstances shall the Closing take place prior to January
15, 2001. The date on which the Closing occurs is the "Closing Date".

          (b) In the event that AT&T or one of its wholly-owned subsidiaries is
required to fund, directly or indirectly (and in each case for the account of
AT&T Wireless or the Wireless Group), earlier than January 22, 2001, in whole or
in part, the

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acquisition of spectrum in the Auction of Licenses for C and F Block Broadband
PCS Spectrum (Auction No. 35), which commenced December 12, 2000, then AT&T
shall provide DoCoMo with an officer's certificate at least five (5) Business
Days prior to the day such funding is required, which certificate shall describe
the specific Spectrum Authorizations to be acquired and the amount of funding
required for the acquisition of each such Authorization and the date that the
relevant payments with respect to the acquisition of such Authorizations are
due. In the event DoCoMo receives such timely notice, only such number of shares
of the New Tracking Stock as is required to equate to the dollar amount
requested in such certificate from AT&T (and in no event greater than $1 billion
worth of such securities) shall be purchased and sold no later than the day
prior to the date that such payments with respect to the acquisition of such
Authorizations are due (but in no event earlier than January 15, 2000), and all
of such shares shall be deemed issued for the account of AT&T Wireless. In such
event, the payment of the balance of the Purchase Price and the delivery of the
balance of the shares of New Tracking Stock to be sold pursuant to Section 1.1
hereof shall take place on January 22, 2001 as previously scheduled (which
payment and delivery shall be considered part of the Closing).

          (c) At the Closing, (i) AT&T shall deliver to DoCoMo or one or more
Designees (w) certificates representing the shares of New Tracking Stock to be
sold on such date pursuant to Section 1.1 and 1.2(b) hereof against payment of
all or the applicable portion of the Purchase Price, under Section 1.1 or
1.2(b), respectively, registered in the name of DoCoMo or one or more Designees,
(x) all other documents and certificates to be delivered to DoCoMo or one or
more Designees by AT&T pursuant to Section 4.2 hereof, (y) a secretary's
certificate of AT&T with respect to the resolutions of the board of directors of
AT&T and/or authorized committees thereof concerning this Agreement, the
Investor Agreement and the Warrant Agreement and the appointment of DoCoMo's
designee to such board of directors and AT&T's Capital Stock Committee and such
other matters as are customary for transactions of this sort and (z) a good
standing certificate with respect to AT&T from the state of New York; (ii) AT&T
Wireless shall deliver to DoCoMo or one or more Designees (w) the warrant
certificate in the form provided in the Warrant Agreement representing the
Warrants to be issued pursuant to Section 1.1 hereof, (x) all other documents
and certificates to be delivered to DoCoMo or one or more Designees by AT&T
pursuant to Section 4.2 hereof, (y) a secretary's certificate with respect to
the resolutions of the board of directors of AT&T Wireless and/or authorized
committees thereof concerning this Agreement, the Investor Agreement and the
Warrant Agreement and such other matters as are customary for transactions of
this sort and (z) a good standing certificate with respect to AT&T Wireless from
the state of Delaware; (iii) DoCoMo or one or more Designees, in full payment
for the Securities to be sold on such date pursuant to Section 1.1 and 1.2(b),
shall deliver to AT&T an amount equal to all or the applicable portion of the
Purchase Price under Section 1.1 or 1.2(b), respectively, in immediately
available funds by wire transfer to the account set

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forth in Schedule 1.2(c) hereto (or such other account as is designated in
writing to DoCoMo and any Designees not less than two Business Days prior to the
Closing), together with all other documents and certificates to be delivered to
AT&T and AT&T Wireless pursuant to Section 4.3 hereof; provided that in the
event that the Closing Date should occur prior to January 22, 2001, as a result
of a required early funding in accordance with Section 1.2(b), then on January
22, 2001 AT&T shall deliver to DoCoMo or one or more Designees certificates
representing the balance of the shares of New Tracking Stock to be sold pursuant
to Section 1.1 hereof not previously delivered at the Closing against payment of
the balance of the Purchase Price not previously paid, registered in the name of
DoCoMo or one or more Designees and DoCoMo or one or more Designees, in full
payment of such balance of the Purchase Price, shall deliver to AT&T an amount
equal to such balance in immediately available funds by wire transfer to the
account previously specified by AT&T.

                                   ARTICLE II

                         REPRESENTATIONS AND WARRANTIES

          Section 2.1 REPRESENTATIONS AND WARRANTIES OF AT&T AND AT&T WIRELESS.
AT&T and AT&T Wireless hereby represent and warrant to DoCoMo as of November 30,
2000 that, except (i) as set forth in the Disclosure Schedule delivered by AT&T
and AT&T Wireless to DoCoMo and attached hereto as Schedule 2.1 (which includes
each of the individual schedules referred to in the following paragraphs of this
Section 2.1) or (ii) as disclosed in AT&T Reports filed prior to November 30,
2000, in each case such that it would reasonably be concluded that such
disclosure would constitute an exception to the relevant section of the
following representations and warranties:

          (a) ORGANIZATION OF AT&T AND WIRELESS GROUP SUBSIDIARIES

          (i) AT&T has been duly incorporated and is validly existing and in
     good standing under the laws of the state of New York, and has all
     requisite power and authority to own, lease and operate its properties and
     to carry out its business as it is now being conducted. AT&T is qualified
     to do business and is in good standing in all jurisdictions where the
     conduct of its business or the ownership of its properties makes such
     qualification necessary, except where failure to so qualify or to be in
     good standing would not reasonably be expected to have, individually or in
     the aggregate, a Wireless Material Adverse Effect;

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          (ii) Each material Wireless Group Subsidiary is listed on Schedule
     2.1(a) annexed hereto and is a corporation or other legal entity duly
     organized, validly existing and in good standing under the laws of the
     jurisdiction of its organization and has power and authority to own, lease
     and operate its properties and to carry out its business as such business
     is now being conducted. Each such Wireless Group Subsidiary is qualified to
     do business and is in good standing in all jurisdictions where the conduct
     of its business or the ownership of its properties makes such qualification
     necessary, except where failure to so qualify or to be in good standing
     would not reasonably be expected to have, individually or in the aggregate,
     a Wireless Material Adverse Effect;

          (iii) AT&T Wireless has been duly incorporated and is validly existing
     in good standing under the laws of the state of Delaware, and has all
     requisite power and authority to own, lease and operate its properties and
     to carry out its business as it is now being conducted. AT&T Wireless is
     qualified to do business and is in good standing in all jurisdictions where
     the conduct of its business or the ownership of its properties makes such
     qualification necessary, except where failure to so qualify or be in good
     standing would not reasonably be expected to have, individually or in the
     aggregate, a Wireless Material Adverse Effect.

          (b) CERTIFICATE OF INCORPORATION AND BY-LAWS. True and complete copies
of the Certificate of Incorporation and by-laws of AT&T and the certificate of
incorporation and by-laws of AT&T Wireless, in each case as in effect on
November 30, 2000, are attached hereto as Exhibits C, D, E and F respectively.

          (c) POWER AND AUTHORITY; NO VIOLATION. Each of AT&T and AT&T Wireless
has all requisite power and authority to execute, deliver and perform its
obligations under this Agreement, the Investor Agreement and the Warrant
Agreement and to consummate the transactions contemplated hereby and thereby. As
of the date hereof, this Agreement, the Investor Agreement and the Warrant
Agreement and all transactions contemplated hereby and thereby will have been
duly and validly authorized by all necessary action on the part of AT&T and AT&T
Wireless, and upon execution by the parties hereto and thereto of this
Agreement, the Investor Agreement and the Warrant Agreement such agreements
shall constitute, legally binding obligations of AT&T or AT&T Wireless, as the
case may be, enforceable in accordance with their terms, subject to bankruptcy,
insolvency, fraudulent transfer, reorganization, moratorium and similar laws of
general applicability relating to or affecting creditors' rights. Except as
described on Schedule 2.1(c) annexed hereto, neither the execution, delivery or
performance of this Agreement, the Investor Agreement or the Warrant Agreement,
nor the consummation of the transactions contemplated by this Agreement, the
Investor Agreement or the Warrant Agreement by AT&T or AT&T Wireless, as the
case may be, will, with or without the

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giving of notice or the passage of time, or both, (i) conflict with, result in a
default or loss of rights (or give rise to any right of termination,
cancellation or acceleration) under, or result in the creation of any Lien,
pursuant to (A) any provision of the certificates of incorporation, by-laws,
stockholders agreements or other constituent documents of AT&T or AT&T Wireless;
(B) any contract, note, bond, indenture, mortgage, deed of trust contract,
agreement, lease or other instrument or obligation to which AT&T, AT&T Wireless
or any of their respective Subsidiaries is or is to be a party or by which AT&T,
AT&T Wireless or any of their respective Subsidiaries may be bound or affected;
or (C) any law, order, judgment, ordinance, rule, regulation or decree to which
AT&T, AT&T Wireless or any of their respective Subsidiaries is or is to be a
party or by which their respective property is bound or affected; or (ii) give
rise to any right of first refusal or similar right with respect to any interest
or any properties or assets of AT&T, AT&T Wireless or any Wireless Group
Subsidiary; except in the case of subclauses (B) and (C) of clause (i) for
conflicts, defaults, Losses or Liens and except in the case of clause (ii) for
rights of first refusal or similar rights, that would not reasonably be expected
to have, individually or in the aggregate, a Wireless Material Adverse Effect.
Except as described on Schedule 2.1(c) annexed hereto, no permit, consent,
approval, Authorization, qualification or registration of, or declaration to or
filing with any Governmental Entity or third party is required to be obtained or
made by AT&T, AT&T Wireless or any of their respective Subsidiaries in
connection with the execution and delivery of this Agreement, the Investor
Agreement or the Warrant Agreement or the consummation of the transactions
contemplated hereby or thereby.

          (d) CAPITALIZATION. As of the Closing Date, the authorized capital of
AT&T shall consist of 100,000,000 shares of Preferred Stock, 6,000,000,000
shares of Common Stock, 4,000,000,000 shares of Class A Liberty Media Group
Common Stock, 400,000,000 shares of Class B Liberty Media Group Common Stock,
and 6,000,000,000 shares of Current Wireless Tracking Stock. As of October 31,
2000, 360,971,000 shares of Current Wireless Tracking Stock and as of the date
hereof no shares of Preferred Stock were issued and outstanding. Since October
31, 2000, AT&T has not issued additional shares of Current Wireless Tracking
Stock other than pursuant to exercise of options granted under AT&T Stock Option
Plan. As of the Closing Date, all of the issued and outstanding shares of the
Current Wireless Tracking Stock will be duly and validly authorized and issued,
fully paid and nonassessable. As of November 30, 2000, 73,875,551 shares of
Current Wireless Tracking Stock (and up to an additional 350,000 shares with
respect to options granted to new hires during November 2000) are subject to
issuance upon exercise of outstanding options granted under AT&T Stock Option
Plans. Other than as set forth in the immediately preceding sentence, and other
than as contemplated by this Agreement or the Warrant Agreement, as of November
30, 2000 there were no options or other securities exercisable, convertible or
exchangeable for any shares of Current Wireless Tracking Stock, there were no
shares of Current Wireless

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Tracking  Stock  authorized  and reserved for  issuance,  AT&T does not have any
Rights issued or outstanding  with respect to Current  Wireless  Tracking Stock,
and AT&T does not have any  commitment to  authorize,  issue or sell any Current
Wireless  Tracking Stock or Rights.  As of the Closing Date,  none of the issued
and outstanding  Current  Wireless  Tracking Stock will be subject to preemptive
rights, except as contemplated by this Agreement and the Investor Agreement. All
of the issued and outstanding shares of the Wireless Group Subsidiaries' capital
stock will have been duly and  validly  authorized  and  issued,  fully paid and
nonassessable  except as would not reasonably be expected to have,  individually
or in the aggregate,  a Wireless  Material Adverse Effect.  There are no Rights,
options or other  securities  exercisable,  convertible or exchangeable  for any
Wireless Group Subsidiary  capital stock,  there are no shares of Wireless Group
Subsidiary capital stock authorized and reserved for issuance, no Wireless Group
Subsidiary  has any Rights  issued or  outstanding  with respect to any Wireless
Group  Subsidiary's  capital  stock and no  Wireless  Group  Subsidiary  has any
commitment to authorize,  issue or sell any Wireless  Group  Subsidiary  capital
stock or Rights,  in each case  except as would not  reasonably  be  expected to
have,  individually  or in the aggregate,  a Wireless  Material  Adverse Effect.
Immediately  following the Spin-off all of the issued and outstanding  shares of
AT&T  Wireless'  capital  stock will have been duly and validly  authorized  and
issued,  fully paid and  nonassessable.  There are no  Rights,  options or other
securities  exercisable,  convertible  or  exchangeable  for any  AT&T  Wireless
capital stock, there are no shares of AT&T Wireless capital stock authorized and
reserved  for  issuance,  AT&T  Wireless  does  not have any  Rights  issued  or
outstanding  with respect to any of its capital stock and AT&T Wireless does not
have any  commitment  to  authorize,  issue or sell any of its capital  stock or
Rights,  in each case except as  contemplated  by this  Agreement,  the Investor
Agreement,  the Warrant Agreement,  the New Tracking Stock, the Current Wireless
Tracking Stock, AT&T Stock Options Plans or the Separation Agreements. Except as
described  in  Schedule  2.1(d)  annexed  hereto,   and  except  for  directors'
qualifying shares or similar shares, AT&T owns, directly or indirectly,  100% of
the outstanding shares of capital stock of all Wireless Group Subsidiaries,  and
except as described in Schedule 2.1(d) annexed hereto,  upon the Spin-off,  AT&T
Wireless shall own, directly or indirectly,  100% of all the outstanding  shares
of capital stock of all Wireless Group Subsidiaries.

          (e) SPIN-OFF AND SEPARATION AGREEMENTS. AT&T has provided DoCoMo with
drafts of all agreements or term sheets relating to the Spin-off and the
separation of the Wireless Group from AT&T and the schedules related thereto
other than those that collectively are not material to AT&T Wireless or the
Wireless Group, and such agreements in the forms annexed to the Letter Agreement
and listed on Schedule 2.1(e) hereto, in all cases as amended or revised to the
extent not prohibited by the Investor Agreement, are referred to herein as the
"Separation Agreements."

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          (f) NEW SECURITIES. The (i) shares of New Tracking Stock to be issued
under this Agreement or upon exercise of the Warrants, (ii) shares of Current
Wireless Tracking Stock into which such shares of New Tracking Stock are
converted or to be issued upon exercise of the Warrants, (iii) AT&T Wireless
Common Stock into which the Current Wireless Tracking Stock (received as a
result of the conversion of the New Tracking Stock) shall be exchanged in the
Spin-off, (iv) Warrants and (v) shares of AT&T Wireless Common Stock issuable
upon exercise of the Warrants following the Spin-off have been duly authorized
by all requisite corporate action on the part of AT&T (with respect to
securities of AT&T), other than the filing of the Certificate of Amendment to
the Certificate of Incorporation setting forth the terms of the New Tracking
Stock, and prior to the Closing (in the case of the Warrants) or prior to the
Spin-off (in the case of AT&T Wireless Common Stock), shall have been duly
authorized by all requisite corporate action on the part of AT&T Wireless (with
respect to securities of AT&T Wireless), and all such securities shall be, when
issued, validly issued and outstanding, fully paid and nonassessable, and shall
not be subject to any preemptive rights of the holders of any other class or
series of the capital stock of AT&T or of AT&T Wireless, as the case may be,
except as provided in this Agreement or the Investor Agreement. Upon the
issuance of any such Securities, such Securities shall be free and clear of all
Liens of any nature whatsoever, with the exception of any restrictions on
transferability set forth in the Investor Agreement or under the Securities Act
or any securities laws of any jurisdiction. As of November 30, 2000, and based
on the number of shares of outstanding Current Wireless Tracking Stock and
options as of October 31, 2000 (using the treasury method), the shares of New
Tracking Stock to be issued to DoCoMo (not including those shares issuable upon
exercise of the Warrants) would, upon issuance, constitute 16.000% of the voting
and economic interest in the Wireless Group. Based upon the number of shares of
outstanding Current Wireless Tracking Stock and options as of October 31, 2000
(using the treasury method), upon conversion of the New Tracking Stock in the
Spin-off, the AT&T Wireless Common Stock issued in respect thereof would, upon
issuance constitute 16.000% of the voting and economic interest in AT&T Wireless
(without giving effect to the Warrants, the issuance of any shares of Current
Wireless Tracking Stock upon exercise thereof or the issuance of any other new
economic interests with respect to the Wireless Group or AT&T Wireless after
November 30, 2000).

          (g) REPORTS. Since December 31, 1999, AT&T has filed all reports,
registration statements, definitive proxy statements or information statements
under the Securities Act, or under Section 13(a), 13(c), 14 or 15(d) of the
Exchange Act or under the securities regulations of the SEC, in the form filed
with the SEC as of the date filed, together with any required amendments
thereto, that it was required to file with the SEC. All such reports and
statements filed with the SEC are collectively referred to herein as the "AT&T
Reports." As of their respective dates, the AT&T Reports, insofar as they

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relate to the Wireless Group, (A) complied in all material respects as to form
with the applicable requirements under the Securities Act or the Exchange Act,
as the case may be, and (B) did not contain any untrue statement of a material
fact or omit to state a material fact required to be stated therein or necessary
to make the statements therein, in the light of the circumstances under which
they were made, not misleading; and each of the balance sheets of the Wireless
Group contained in or incorporated by reference into any such AT&T Report
(including the related notes and schedules thereto) fairly presented in all
material respects, the financial position of the Wireless Group as of its date,
and each of the statements of income and changes in shareholders' equity and
cash flows or equivalent statements of the Wireless Group in such AT&T Reports
(including any related notes and schedules thereto) fairly presented in all
material respects, the results of operations, changes in shareholders' equity
and changes in cash flows, as the case may be, for the periods to which they
relate, in each case in accordance with GAAP consistently applied during the
periods involved, except in each case as may be noted therein, subject to normal
year-end audit adjustments in the case of unaudited statements.

          (h) NO MATERIAL ADVERSE CHANGE. Since December 31, 1999, there has not
been any event or condition which has caused or resulted in, or could be
reasonably expected to cause or to result in, individually or in the aggregate,
a Wireless Material Adverse Effect.

          (i) COMPLIANCE WITH LAWS. AT&T, AT&T Wireless and each Wireless Group
Subsidiary are in compliance with all applicable laws, regulations,
administrative orders and Authorizations (including all applicable rules,
regulations and Authorizations of the FCC, any state public utilities or public
service commission, or any other Federal or state governmental agency or
instrumentality exercising jurisdiction over AT&T, AT&T Wireless or such
Wireless Group Subsidiary), and of each municipality, county or subdivision of
any thereof, to which any of its businesses or any of its properties may be
subject, other than any non-compliance that would not reasonably be expected to
have, individually or in the aggregate, a Wireless Material Adverse Effect.

          (j) LITIGATION AND OTHER PROCEEDINGS. There is no pending or, to the
knowledge of AT&T or AT&T Wireless, threatened, claim, action, suit,
investigation or proceeding, against AT&T, AT&T Wireless or any of their
respective Subsidiaries, nor is AT&T, AT&T Wireless or any of their respective
Subsidiaries subject to any order, judgment or decree, except for matters that
have not had a Wireless Material Adverse Effect or would not reasonably be
expected to have, individually or in the aggregate, a Wireless Material Adverse
Effect.

          (k) INTELLECTUAL PROPERTY. AT&T, AT&T Wireless and the Wireless Group
Subsidiaries have all right, title and interest in, or a valid and binding
license to use, all

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Intellectual Property that is used in the operation of the business of the
Wireless Group as it is currently conducted (the "Wireless Intellectual
Property"), except where the failure to have such right, title and interest or
have the right to use such Wireless Intellectual Property would not reasonably
be expected to have, individually or in the aggregate, a Wireless Material
Adverse Effect. AT&T, AT&T Wireless and the Wireless Group Subsidiaries (i) have
not defaulted under any license to use Wireless Intellectual Property, and (ii)
are not, as of November 30, 2000, the subject of any proceeding or litigation
for infringement of any third party Intellectual Property other than a default
proceeding or litigation, that is not having or would not be reasonably expected
to have, individually or in the aggregate, a Wireless Material Adverse Effect.
For the purposes of this Agreement, "Intellectual Property" means patents and
patent rights, trademarks and trademark rights, trade names and trade name
rights, service marks and service mark rights, copyrights and copyright rights,
trade secret and trade secret rights, know-how and other intellectual property
rights, and all pending applications for and registrations for any of the
foregoing.

          (l) CONTRACTS; INTERCOMPANY AGREEMENTS; NO DEFAULTS. All contracts
relating to the Wireless Group required to be filed with the SEC by AT&T
pursuant to Item 601 of Regulation S-K have been filed in the AT&T Reports and
the AT&T Reports accurately describe in all material respects the relationship
between the Common Stock Group on the one hand, and the Wireless Group, on the
other hand. Neither AT&T nor any of its Subsidiaries, nor, to the knowledge of
AT&T or AT&T Wireless, any other party, is in default, nor has any event
occurred that, with the passage of time or the giving of notice, or both, would
constitute a default, under any agreement, indenture, loan agreement or other
instrument to which AT&T, AT&T Wireless or any such Subsidiary is a party, or by
which AT&T, AT&T Wireless or any such Subsidiary is bound or to which any of the
assets of AT&T, AT&T Wireless or any of such Subsidiaries are subject, the
result of which would be reasonably expected to have, individually or in the
aggregate, a Wireless Material Adverse Effect.

          (m) AUTHORIZATIONS.

          (i) AT&T, AT&T Wireless, and the Wireless Group Subsidiaries have (A)
     all requisite Authorizations of the FCC (including all PCS Authorizations)
     and of all state public utility or public service commissions and (B) all
     other Authorizations of Governmental Entities exercising jurisdiction over
     AT&T, AT&T Wireless and the Wireless Group Subsidiaries required to carry
     on the business of the Wireless Group as now conducted, except in each case
     where the failure to have such Authorizations would not reasonably be
     expected to have, individually or in the aggregate, a Wireless Material
     Adverse Effect.

                                       10
<PAGE>

          (ii) Such Authorizations are in full force and effect and have not
     been suspended, modified in any material adverse respect, canceled or
     revoked, and AT&T, AT&T Wireless and the Wireless Group Subsidiaries have
     operated in compliance with all terms thereof or any renewals thereof
     applicable to it except where failure to be in full force and effect or to
     so comply would not reasonably be expected to have, individually or in the
     aggregate, a Wireless Material Adverse Effect. No event has occurred with
     respect to any of the Authorizations which permits, or after notice or
     lapse of time or both would permit, revocation or termination thereof or
     would result in any other material impairment of the rights of the holder
     of any such Authorizations, except to the extent such revocation,
     termination or impairment would not reasonably be expected to have,
     individually or in the aggregate, a Wireless Material Adverse Effect.
     Except as set forth in Schedule 2.1(m) annexed hereto, there is not pending
     as of November 30, 2000 any application, petition, objection or other
     pleading with the FCC or any public service commission or similar body
     having jurisdiction or authority over the communications operations of
     AT&T, AT&T Wireless or the Wireless Group Subsidiaries which would
     reasonably be expected to result in the revocation, cancellation,
     suspension or any materially adverse modification of, any such
     Authorizations, except to the extent such invalidity, revocation,
     cancellation, suspension or modification would not reasonably be expected
     to have, individually or in the aggregate, a Wireless Material Adverse
     Effect.

          (n) TAXES.

          (i) Except as would not, individually or in the aggregate, reasonably
     be expected to have a Wireless Material Adverse Effect, each of AT&T and
     its Subsidiaries has timely filed (or there has been timely filed on their
     behalf) all income Tax Returns and all material other United States
     federal, state, county, local and foreign Tax Returns required to be filed
     by them, taking into account any extension of time to file granted to or
     obtained on behalf of the affiliated group of which AT&T is the common
     parent and AT&T and its Subsidiaries have paid all material Taxes due,
     other than Taxes appropriate reserves for which have been made in AT&T's
     financial statements.

          (ii) Except as would not, individually or in the aggregate, reasonably
     be expected to have a Wireless Material Adverse Effect, there are no claims
     or assessments pending against AT&T or any of its Subsidiaries for any
     alleged deficiency in any Tax, and AT&T has not been notified in writing of
     any proposed material Tax claims or assessments against AT&T or any of its
     Subsidiaries (other than, in each case, claims or assessments for which
     adequate

                                       11
<PAGE>

     reserves in the AT&T financial statements have been established or which
     are being contested in good faith or are immaterial in amount).

          (iii) There are no Liens for Taxes on the assets of the Wireless
     Group, except for statutory liens for current Taxes not yet due and payable
     (and except for Liens which do not and would not reasonably be expected to
     have, individually or in the aggregate, a Wireless Material Adverse
     Effect).

          (iv) For purposes of this Agreement, the term "Tax" means any United
     States federal, state, county or local, or foreign or provincial income,
     gross receipts, property, sales, use, license, excise, franchise,
     employment, payroll, value added, alternative or added minimum, ad valorem
     or transfer tax, or any other tax, custom, duty or governmental fee or
     other like assessment or charge of any kind whatsoever, together with any
     interest or penalty imposed by any Governmental Entity. The term "Tax
     Return" means a 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 Entity with respect
     to any Tax, including an information return, claim for refund, amended
     return or declaration or estimated Tax.

          (o) BENEFIT PLANS. Except as would not reasonably be expected to have,
individually or in the aggregate, a Wireless Material Adverse Effect:

          (i) Each "employee benefit plan," within the meaning of Section 3(3)
     of the Employee Retirement Income Security Act of 1974, as amended
     ("ERISA"), other than a "multiemployer plan" within the meaning of Section
     3(37) of ERISA, which is maintained by AT&T Wireless or any Wireless Group
     Subsidiary or to which AT&T Wireless or any Wireless Group Subsidiary
     contributes (a "Plan") is in compliance with the applicable requirements of
     ERISA and the Internal Revenue Code of 1986, as amended (the "Code"). There
     is no pending or, to the knowledge of AT&T or AT&T Wireless threatened,
     litigation relating to any Plan. Neither AT&T, AT&T Wireless nor any
     Wireless Group Subsidiary has engaged in a transaction with respect to any
     Plan that, assuming the taxable period of such transaction expired as of
     the date hereof, could subject AT&T Wireless or any Wireless Group
     Subsidiary to a tax or penalty imposed by either Section 4975 of the Code
     or Section 502(i) of ERISA.

          (ii) No liability under Subtitle C or D of Title IV of ERISA has been
     or is expected to be incurred by AT&T Wireless or any Wireless Group
     Subsidiary with respect to any ongoing, frozen or terminated
     "single-employer plan", within the meaning of Section 4001(a)(15) of ERISA,
     currently or formerly maintained

                                       12
<PAGE>

     by any of them, or the single-employer plan of any entity which is
     considered one employer with AT&T Wireless under Section 4001 of ERISA or
     Section 414 of the Code (an "ERISA Affiliate"). AT&T Wireless and the
     Wireless Group Subsidiaries have not incurred and do not expect to incur
     withdrawal liability with respect to a multiemployer plan under Subtitle E
     of Title IV of ERISA. No notice of a "reportable event", within the meaning
     of Section 4043 of ERISA for which the 30-day reporting requirement has not
     been waived, has been required to be filed for any Plan which is an
     "employee pension benefit plan" within the meaning of Section 3(2) of ERISA
     ("Pension Plan") or by any ERISA Affiliate within the 12-month period
     ending on the date hereof, or will be required to be filed in connection
     with the transactions contemplated by this Agreement.

          (iii) Neither any Pension Plan nor any single-employer plan of an
     ERISA Affiliate has an "accumulated funding deficiency" (whether or not
     waived) within the meaning of Section 412 of the Code or Section 302 of
     ERISA and no ERISA Affiliate has an outstanding funding waiver. Neither
     AT&T Wireless nor any Wireless Group Subsidiary has provided, or is
     required to provide, security to any Pension Plan or to any single-employer
     plan of an ERISA Affiliate pursuant to Section 401(a)(29) of the Code.

          (iv) Neither AT&T Wireless nor any Wireless Group Subsidiary maintains
     or contributes to a Plan subject to Title IV of ERISA.

          (p) INVESTMENT COMPANY ACT. AT&T is not, and will not become after
giving effect to the Closing, and AT&T Wireless will not, upon consummation of
the Spin-off be, an "investment company" within the meaning of the Investment
Company Act of 1940, as amended.

          (q) ASSETS; TITLE TO PROPERTIES.

          (i) Each of AT&T, AT&T Wireless and the Wireless Group Subsidiaries
     has good and valid title to, or, in the case of leased properties and
     assets, valid leasehold interests in, all of its material tangible
     properties and assets, real, personal and mixed, used or held for use in
     the business of the Wireless Group, free and clear of any Liens except (i)
     as reflected in the financial statements contained in the AT&T Reports and
     (ii) for such Liens, title defects or leasehold interest defects, if any,
     which have not had and would not reasonably be expected to have,
     individually or in the aggregate, a Wireless Material Adverse Effect.

          (ii) On or prior to the consummation of the Spin-off, AT&T shall have
     transferred or shall have caused its subsidiaries to transfer to AT&T
     Wireless or

                                       13
<PAGE>

     one or more of its subsidiaries all of AT&T's or its Subsidiaries' right,
     title and interest in and to all assets, properties and rights (contractual
     or otherwise) of every kind, nature and description, real, personal and
     mixed, tangible and intangible, wherever located which are required by the
     Separation Agreements to be transferred to AT&T Wireless or one or more of
     its Subsidiaries prior to such consummation. After giving effect to such
     transfers, the Spin-off and the Separation Agreements, AT&T Wireless and
     its Subsidiaries will possess, to the same extent in all material respects
     as currently possessed by the Wireless Group, the assets and rights
     necessary to conduct the business of the Wireless Group substantially as
     currently conducted.

          (r) ENVIRONMENTAL LIABILITY. There is no legal, administrative, or
other proceedings, claim or action of any nature that would reasonably be
expected to result in the imposition of, on AT&T or any of its Subsidiaries, any
liability relating to the release of hazardous substances as defined under any
local, state or federal environmental statute, regulation or ordinance,
including the Comprehensive Environmental Response, Compensation and Liability
Act of 1980, as amended (the "CERCLA"), pending or, to the knowledge of AT&T or
AT&T Wireless, threatened against AT&T or any of its Subsidiaries, the result of
which has had or would reasonably be expected to have, individually or in the
aggregate, a Wireless Material Adverse Effect; to the knowledge of AT&T or AT&T
Wireless, there is no reasonable basis for any such proceeding, claim or action;
and to the knowledge of AT&T or AT&T Wireless, neither AT&T Wireless nor any
Wireless Group Subsidiary is subject to any agreement, order, judgment or decree
by or with any Governmental Entity or third party imposing any such
environmental liability.

          (s) NO BROKERS. Except for Salomon Smith Barney, no agent, broker,
investment banker, Person or firm is or will be entitled to any broker's or
finder's fee or any other commission or similar fee payable by or allocable to
the Wireless Group directly or indirectly in connection with the transactions
contemplated by this Agreement based in any way on any arrangements, agreements
or understandings made by or on behalf of AT&T or an Affiliate thereof.

          (t) TECHNOLOGY. AT&T Wireless currently intends to introduce UMTS
(also known as W-CDMA) services and, in that regard, to deploy Global System for
Mobile Communications together with General Packet Radio Services capabilities.

          Section 2.2 REPRESENTATIONS AND WARRANTIES OF DOCOMO. DoCoMo hereby
represents and warrants to AT&T and AT&T Wireless as of November 30, 2000 that,
except as set forth in the Disclosure Schedule delivered by DoCoMo to AT&T and
AT&T Wireless and attached hereto as Schedule 2.2 (which includes each of the

                                       14
<PAGE>

individual schedules referred to in the following paragraphs of this Section
2.2) and attached hereto such that it would reasonably be concluded that such
disclosure would constitute an exception to the relevant subsection of the
following representations and warranties:

          (a) ORGANIZATION AND QUALIFICATION. DoCoMo has been duly incorporated
and is validly existing under the laws of Japan and has all requisite power and
authority to own, lease and operate its properties and to carry out its business
as it is now being conducted.

          (b) POWER AND AUTHORITY; NO VIOLATION. DoCoMo has all requisite power
and authority to execute, deliver and perform its obligations under this
Agreement, the Investor Agreement and the Warrant Agreement and to consummate
the transactions contemplated hereby and thereby. As of November 30, 2000, this
Agreement, the Investor Agreement and the Warrant Agreement and all transactions
contemplated hereby and thereby shall have been duly and validly authorized by
all necessary action on the part of DoCoMo, and upon execution and delivery by
the parties thereto of this Agreement, the Investor Agreement and the Warrant
Agreement, such agreements shall constitute, legally binding obligations of
DoCoMo, enforceable in accordance with their terms, subject to bankruptcy,
insolvency, fraudulent transfer, reorganization, moratorium and similar laws of
general applicability relating to or affecting creditors' rights. Except as
described on Schedule 2.2(b) annexed hereto, neither the execution, delivery or
performance of this Agreement, the Investor Agreement or the Warrant Agreement,
nor the consummation of the transactions contemplated by this Agreement, the
Investor Agreement or the Warrant Agreement by DoCoMo will, with or without the
giving of notice of the passage of time, or both, (i) conflict with, result in a
default or loss of rights (or give rise to any right of termination,
cancellation or acceleration) under, or result in the creation of any Lien,
pursuant to (A) any provision of the constituent documents of DoCoMo; (B) any
contract, note, bond, indenture, mortgage, deed of trust contract, agreement,
lease or other instrument or obligation to which DoCoMo is or is to be a party
or by which DoCoMo may be bound or affected; or (C) any law, order, judgment,
ordinance, rule, regulation or decree to which DoCoMo is or is to be a party or
by which DoCoMo's property is bound or affected; or (ii) give rise to any right
of first refusal or similar right with respect to any interest or any properties
or assets of DoCoMo; except in the case of subclauses (B) and (C) of clause (i)
for conflicts, defaults, losses or Liens and except in the case of clause (ii)
for rights of first refusal or similar rights that would not reasonably be
expected to have, individually or in the aggregate, a material adverse effect on
DoCoMo's ability to consummate the transactions contemplated by and perform its
obligations under this Agreement, the Investor Agreement and the Warrant
Agreement. Except as described on Schedule 2.2(b) annexed hereto, no permit,
consent, approval, Authorization, qualification or registration of, or
declaration to or filing with any

                                       15
<PAGE>

Governmental Entity or third party is required to be obtained or made by DoCoMo
in connection with the execution and delivery of this Agreement, the Investor
Agreement or the Warrant Agreement or the consummation of the transactions
contemplated by this Agreement, the Investor Agreement or the Warrant Agreement.

          (c) PURCHASE FOR INVESTMENT. DoCoMo acknowledges that the New Tracking
Stock, the Warrants, any Current Wireless Tracking Stock issued upon conversion
of the New Tracking Stock and the AT&T Wireless Common Stock to be received in
exchange for shares of New Tracking Stock or Current Wireless Tracking Stock
upon consummation of the Spin-off or issuable upon exercise of the Warrants have
not been registered under the Securities Act or under any state securities laws.
DoCoMo or one or more Designees (i) is acquiring the Securities pursuant to an
exemption from registration under the Securities Act solely for investment with
no present intention to distribute any of the Securities to any person, (ii)
will not sell or otherwise dispose of any of the Securities, except in
compliance with the registration requirements or exemption provisions of the
Securities Act and any other applicable securities laws, (iii) has such
knowledge and experience in financial and business matters and in investments of
this type that it is capable of evaluating the merits and risks of its
investment in the Securities and of making an informed investment decision and
(iv) is an accredited investor (as that term is defined by Rule 501 promulgated
under the Securities Act).

          (d) LITIGATION AND OTHER PROCEEDINGS. There is no pending or, to the
knowledge of DoCoMo, threatened, claim, action, suit, investigation or
proceeding, against DoCoMo or any of its Subsidiaries, nor is DoCoMo or any of
its Subsidiaries subject to any order, judgment or decree, except for matters
that would not reasonably be expected, individually or in the aggregate, to
materially impair DoCoMo's ability to consummate the transactions contemplated
by this Agreement, the Investor Agreement or the Warrant Agreement.

          (e) NO BROKERS. Except for Goldman, Sachs & Co., no agent, broker,
investment banker, Person or firm is or will be entitled to any
broker's or finder's fee or any other commission or similar fee directly or
indirectly in connection with the transactions contemplated by this Agreement
based in any way on any arrangements, agreements or understandings made by or on
behalf of DoCoMo.

          (f) AVAILABLE FUNDS. On or prior to the Closing Date, DoCoMo will have
available to it sufficient funds to pay the Purchase Price or balance thereof
payable on such date and, in the event of an earlier funding as contemplated by
Section 1.2, DoCoMo will have on or prior to January 15, 2001 available to it
sufficient funds to pay the portion of the Purchase Price payable on the earlier
funding date.

                                       16
<PAGE>

          Section 2.3 ADDITIONAL REPRESENTATIONS AND WARRANTIES OF DOCOMO AND/OR
DESIGNEES. DoCoMo hereby represents and warrants to AT&T and AT&T Wireless that
each Designee is, or at the time such Designee becomes such and at the Closing
shall be, directly or indirectly a wholly-owned Subsidiary of DoCoMo, and that
no Person, other than any other wholly owned Subsidiary of DoCoMo, shall own at
the time such Designee becomes such and at the Closing any equity security (or
any partnership or other interest that is in the nature of equity) of such
Designee or has or shall have on such date any right to appoint or designate any
director or member of its board of directors or similar governing body.

          Section 2.4 REPRESENTATIONS AND WARRANTIES OF THE DESIGNEES. Each
Designee, in agreeing to be bound hereby, shall make each of the representations
and warranties made by DoCoMo in Section 2.2 with respect to such Designee with
such immaterial changes as are necessary to reflect the different nature of such
Designee, such as references to jurisdiction of incorporation.

                                   ARTICLE III

                                    COVENANTS

          Section 3.1 COOPERATION AND ACCESS. Subject to applicable law,
attorney-client privilege and existing confidentiality agreements, from November
30, 2000 until the Closing, each of AT&T and AT&T Wireless shall, and shall
cause their respective Subsidiaries to, afford DoCoMo and its officers,
employees, counsel, accountant and other representatives reasonable access
during normal business hours, upon reasonable notice, to all books, records,
properties, personnel and such other information as DoCoMo may request in each
case related to the Wireless Group. All non-public information obtained by
DoCoMo and its representatives shall be maintained in confidence and used only
for the purposes related to the transactions and activities contemplated by this
Agreement.

          Section 3.2 CONDUCT OF BUSINESS. From November 30, 2000 until the
Closing, each of AT&T and AT&T Wireless shall, and shall cause their respective
Subsidiaries to, carry on the business of the Wireless Group in the ordinary
course of business, and use commercially reasonable efforts to (i) preserve
intact its present business organization, (ii) keep available the services of
its present officers and employees and (iii) preserve intact its relationships
with customers, suppliers and other third parties with whom the Wireless Group
deals (it being understood that the covenant in this sentence will not prohibit
AT&T or AT&T Wireless from taking any action

                                       17
<PAGE>

permitted under clause (a) of this Section 3.2). From the date hereof until the
Closing, each of AT&T and AT&T Wireless shall not, and shall not permit any of
their respective Subsidiaries to, without DoCoMo's prior written consent:

          (a) take any action that would be subject to DoCoMo's prior approval
under Section 3.2 of the Investor Agreement if such action were to be taken
after the Closing Date; or

          (b) with respect to AT&T, issue any equity securities to which
DoCoMo's Preemptive Rights (as defined in the Investor Agreement) would apply if
such equity securities were to be issued after the Closing Date, except for
shares of Current Wireless Tracking Stock issuable upon exercise of options
outstanding as of November 30, 2000 or issued pursuant to the AT&T Stock Option
Plan after November 30, 2000 in the ordinary course of business; provided that,
AT&T may issue such equity securities ("Permitted Securities") following
consultation with DoCoMo (but without the requirement of DoCoMo's consent) so
long as such Permitted Securities issued in the aggregate do not exceed fifteen
percent (15%) of the total Economic Interests (as defined in the Investor
Agreement) in the Wireless Group as of November 30, 2000; and provided further
that, after the Closing Date, in the event AT&T issues Permitted Securities
after November 30, 2000 and before the Closing Date, DoCoMo or one or more
Designees shall have the right (the "Pre-Closing Preemptive Right") during the
thirty (30) day period following the Closing Date to elect to purchase an
additional number of shares so that following such purchase DoCoMo (or one or
more Designees) shall own Economic Interests in the Wireless Group that would
have equaled, on the Closing Date, 16.000% of all outstanding Economic Interests
in the Wireless Group on the Closing Date (on a Fully Diluted Basis, as such
term is defined in the Investor Agreement) at the same purchase price and on
substantially the same terms and subject to substantially the same conditions as
such Permitted Securities were issued. Notice of exercise with respect to such
Pre-Closing Preemptive Rights shall specify the number of shares to be purchased
and the date on which such shares are to be purchased which shall be no later
than the fortieth (40th) day following the Closing Date. AT&T shall provide
DoCoMo with notice of the proposed issuance of Permitted Securities as soon as
reasonably practicable prior to the issuance of such securities. The closing
with respect to the exercise of any such Pre-Closing Preemptive Rights shall
take place on such 40th day or, if later, on the first Business Day following
receipt of all required regulatory approvals and expiration of all required
waiting periods but in no event later than the sixth month anniversary of the
Closing Date. For the avoidance of doubt, it is agreed and understood that (i)
any issuance of Current Wireless Tracking Stock that reflects a disposition of
all or part of AT&T's Retained Wireless Interest (i.e., that does not result in
any adjustment to the denominator of the Wireless Group Allocation Fraction)
shall not be an issuance of Permitted Securities and shall not give rise to any
Pre-Closing Preemptive Rights and (ii)

                                       18
<PAGE>

the Pre-Closing  Preemptive  Right shall not apply with respect to any issuances
between November 30, 2000 and the Closing Date pursuant to employee,  officer or
director benefit plans or arrangements which shall,  instead,  be subject to the
March 31, 2001 or September 30, 2001 notice  contemplated  by Section  8.1(a) of
the Investor Agreement.

          Section 3.3 CERTIFICATE OF AMENDMENT. AT&T shall, prior to or
concurrently with the Closing cause the Certificate of Amendment to be filed
with the Secretary of State of the State of New York.

          Section 3.4 PROCEEDS. AT&T shall be entitled to retain $3,651,615,431
of the proceeds from the payment of the Purchase Price, and the remainder shall
be contributed to AT&T Wireless. AT&T shall, simultaneously with the Closing,
contribute $6,159,464,289 of the proceeds from the payment of the Purchase Price
to AT&T Wireless, provided that in the event that the Closing Date occurs prior
to January 22, 2001, as a result of the required early funding related to a
spectrum acquisition, then AT&T shall, simultaneously with such Closing,
contribute 100% of the proceeds paid on such date to AT&T Wireless and, on
January 22, 2001, shall contribute such portion of the balance of the Purchase
Price paid on that date such that on or prior to such date AT&T shall have
contributed $6,159,464,289 of the proceeds to AT&T Wireless.

          Section 3.5 LISTING OF SHARES. As soon as practicable, but in any
event prior to the Closing Date, AT&T shall use its reasonable efforts to cause
the shares of Current Wireless Tracking Stock into which the shares of New
Tracking Stock are convertible to be listed for trading on the New York Stock
Exchange, subject to official notice of issuance.

          Section 3.6 COMMERCIALLY REASONABLE EFFORTS; GOVERNMENT APPROVALS.

          (a) Upon the terms and subject to the conditions herein provided, each
of the parties hereto agrees to use all reasonable efforts to take, or cause to
be taken, all action and to do, or cause to be done, all things necessary for it
to do under applicable laws and regulations to consummate and make effective the
transactions contemplated by this Agreement, including, without limitation, (i)
to comply promptly with all legal requirements which may be imposed on it with
respect to this Agreement and the transactions contemplated hereby (which
actions shall include, without limitation, furnishing all information required
by applicable laws and regulations in connection with approvals of or filings
with any Governmental Entity), (ii) to satisfy the conditions precedent to the
obligations of the parties hereto and (iii) to obtain any consent,
authorization, order or approval of, or any exemption by, any Governmental
Entity or other public or private third party required to be obtained or made by
DoCoMo, AT&T or

                                       19
<PAGE>

any Subsidiary of AT&T in connection with the taking of any action contemplated
by this Agreement, the Investor Agreement or the Warrant Agreement.

          (b) Subject to appropriate confidentiality protections, each of the
parties hereto shall furnish to the other party such necessary information and
reasonable assistance as such other party may reasonably request in connection
with the foregoing and shall provide the other party with copies of all filings
made by such party with any Governmental Entity and, upon request, any other
information supplied by such party to a Governmental Entity in connection with
this Agreement and the transactions contemplated hereby or by the Investor
Agreement or the Warrant Agreement.

          (c) Without limiting the generality of the foregoing, DoCoMo and AT&T
agree to take or cause to be taken the following actions: (i) provide promptly
to Governmental Entities with regulatory jurisdiction over enforcement of any
applicable Competition Laws ("Governmental Antitrust Entity") information and
documents requested by any Governmental Antitrust Entity or necessary, proper or
advisable to permit consummation of the transactions contemplated by this
Agreement and (ii) without in any way limiting the other provisions of this
Section 3.6, file any notification and report form and related material required
under the HSR Act and with respect to the filings required under any foreign
competition laws as soon as practicable, and thereafter use reasonable efforts
to certify as soon as practicable its substantial compliance with any requests
for additional information or documentary material that may be made under the
HSR Act. Each party hereto shall provide to the other copies of all
correspondence between it (or its advisor) and any Governmental Entity relating
to any matters described in this Section 3.6. Each party hereto will notify the
other of all requests, terms or conditions made or sought to be imposed on
DoCoMo, AT&T, AT&T Wireless or any of their respective Subsidiaries in
connection with obtaining any required approvals and will discuss with the other
party the acceptability of such requests. Each party hereto agrees that each
other party (other than any Designees of DoCoMo) shall have the right to
participate in any meeting between the first party and any Governmental
Antitrust Entity relating to any matters described in this Section 3.6.

          Section 3.7 ADJUSTMENT OF THE ALLOCATION FRACTION. In order to
properly reflect the economic interest of the Wireless Group represented by the
New Tracking Stock, AT&T agrees to take the following actions: Upon application
of the proceeds in accordance with Section 3.4, AT&T agrees that in accordance
with a determination of the AT&T Board of Directors pursuant to the Certificate
of Incorporation, the numerator of the Wireless Group Allocation Fraction shall
be increased by 406,255,889 (representing the total number of shares of Current
Wireless Tracking Stock into which the New Tracking Stock is convertible) and
the denominator of the Wireless Group Allocation Fraction shall be increased by
228,128,307 (representing the total number of shares of

                                       20
<PAGE>

Current Wireless Tracking Stock into which the New Tracking Stock deemed issued
for the account of the Wireless Group is convertible). In the event the Warrants
are exercised to purchase shares of New Tracking Stock or Current Wireless
Tracking Stock, the numerator and the denominator of the Wireless Group
Allocation Fraction will be increased by the number of shares of Current
Wireless Tracking Stock into which the New Tracking Stock issued upon exercise
of the Warrants is convertible or by the number of shares of Current Wireless
Tracking Stock issued upon exercise of such Warrants, as the case may be. No
further adjustment of the numerator or the denominator of the Wireless Group
Allocation Fraction shall be made upon any conversion of New Tracking Stock into
Current Wireless Tracking Stock. For purposes of any calculation under the
Certificate of Incorporation that uses the Wireless Group Allocation Fraction,
(i) all outstanding shares of New Tracking Stock will be treated as if they had
been fully converted into Current Wireless Tracking Stock, (ii) any payments or
exchange rights of the holder of New Tracking Stock will be deemed payments or
exchange rights in respect of the underlying Current Wireless Tracking Stock and
(iii) any payments or exchange rights of the holders of shares of Current
Wireless Tracking Stock actually outstanding as of any calculation date shall be
based on the foregoing adjusted Wireless Group Allocation Fraction further
adjusted to subtract from the numerator thereof the number of shares of Current
Wireless Tracking Stock issuable upon conversion of the then outstanding New
Tracking Stock. For the avoidance of doubt, the intent of the foregoing is (a)
to treat 456,256.614 shares of New Tracking Stock (and the 228,128,307 shares of
Current Wireless Tracking Stock issuable upon conversion thereof) as having been
issued for the account of AT&T Wireless as primary shares, and (b) to treat
356,255.164 shares of New Tracking Stock (and the 178,127,582 shares of Current
Wireless Tracking Stock issuable upon conversion thereof) as having been issued
for the account of AT&T as secondary shares.

          Section 3.8 FURTHER ASSURANCES; SPIN-OFF. Each party shall execute and
deliver both before and after the Closing such further certificates, agreements
and other documents and take such other actions as the other party may
reasonably request as may be necessary or appropriate to consummate or implement
the transactions contemplated hereby or to evidence such events or matters. Each
of AT&T and AT&T Wireless shall use such party's reasonable efforts to enter
into, prior to January 1, 2002, definitive separation agreements substantially
in the form of the Separation Agreements in the form annexed to the Letter
Agreement with such changes thereto as would not require the consent of DoCoMo
under Section 3.2(a)(vi) of the Investor Agreement and would not have a material
adverse effect on DoCoMo. AT&T and AT&T Wireless shall deliver to DoCoMo a copy
of (A) the then current draft of the Separation and Distribution Agreement upon
DoCoMo's request, PROVIDED, that AT&T and AT&T Wireless shall not be required to
comply with such request more frequently than one (1) time per month, (B) within
a reasonable amount of time prior to the execution and delivery of the final
forms

                                       21

<PAGE>

of the Separation Agreements, such final forms and (C) the Separation Agreements
in the form executed and delivered promptly following the execution and delivery
thereof. In the event the Spin-off is to be effected by spinning off the
Wireless Group as the assets of an entity other than AT&T Wireless, the
corporation that is the subject of the Spin-off (and that is or is to be the
issuer of publicly traded common stock representing the former AT&T Wireless
Group) shall execute this Agreement and, upon doing so, shall be substituted for
AT&T Wireless and thereafter be deemed to be a party hereto and all references
herein to "AT&T Wireless" shall thereafter be deemed to be references to such
substituted corporation.

                                   ARTICLE IV

                                   CONDITIONS

          Section 4.1 CONDITIONS TO OBLIGATIONS OF THE PARTIES. The respective
obligations of the parties hereto to consummate the transactions contemplated
hereby are subject to the satisfaction or waiver at or prior to the Closing of
each of the following conditions:

          (a) The expiration or early termination of any applicable waiting
period under the HSR Act;

          (b) The absence of any statute, rule regulation, executive order,
decree or injunction having been enacted, entered, promulgated or enforced by
any Governmental Entity of the United States, Japan, Canada or Mexico that has
the effect of making the Investment illegal or otherwise prohibiting the
consummation of the Investment or that prohibits AT&T Wireless or DoCoMo from
entering into the Alliance materially as contemplated by the Investor Agreement;
and

          (c) The receipt or expiration of any other material approval or
waiting period required by a Governmental Entity, if any.

          Section 4.2 CONDITIONS TO THE OBLIGATIONS OF DOCOMO. The obligations
of DoCoMo to consummate the transactions contemplated hereby are subject to the
satisfaction or waiver at or prior to the Closing of each of the following
conditions:

          (a) Each of the representations and warranties of AT&T and AT&T
Wireless contained in this Agreement shall be true and accurate (in all material
respects in the case of any such representation or warranty that is not
qualified by materiality) as

                                       22

<PAGE>

of the Closing Date as if made on and as of such date (except that
representations and warranties that by their terms speak only as of some other
date need be true and accurate as of such other date);

          (b) Each of AT&T and AT&T Wireless shall have performed and complied
in all material respects with all covenants and agreements contained in this
Agreement that are required to be performed or complied with by AT&T or AT&T
Wireless at or prior to the Closing;

          (c) Each of AT&T and AT&T Wireless shall have delivered to DoCoMo a
certificate of an executive officer of such party certifying as to the matters
set forth in paragraph (a) and paragraph (b) of this Section 4.2 with respect to
AT&T and AT&T Wireless, respectively;

          (d) Each of AT&T and AT&T Wireless shall have executed and delivered
the Investor Agreement and the Warrant Agreement and such agreements shall be in
full force and effect or shall become so by virtue of the Closing;

          (e) The Certificate of Amendment shall have been duly filed with the
Secretary of State of the State of New York in accordance with the laws of the
State of New York and the Certificate of Amendment shall be in full force and
effect; and

          (f) DoCoMo shall have received an opinion from Wachtell, Lipton, Rosen
and Katz, outside counsel to AT&T, subject to customary qualifications, as to
(i) the due authorization and validity of the New Tracking Stock, the Current
Wireless Tracking Stock issuable upon conversion thereof, the AT&T Wireless
Common Stock issuable in exchange for Current Wireless Tracking Stock in the
Spin-off, the Warrants and the New Tracking Stock, Current Wireless Tracking
Stock or AT&T Wireless Common Stock issuable upon exercise thereof and (ii) the
absence of conflict of the Investment with the Certificate of Incorporation, as
amended and in effect on the date of such opinion.

          Section 4.3 CONDITIONS TO THE OBLIGATIONS OF AT&T AND AT&T WIRELESS.
The obligations of AT&T and AT&T Wireless to consummate the transactions
contemplated hereby shall be subject to the satisfaction or waiver at or prior
to the Closing of each of the following additional conditions:

          (a) Each of the representations and warranties of DoCoMo contained in
this Agreement shall be true and accurate as of the Closing, as if made on and
as of such date (except that representations and warranties that by their terms
speak only as of some other date need be true and accurate as of such other
date);

                                       23
<PAGE>

          (b) DoCoMo shall have performed and complied in all material respects
with all covenants and agreements contained in this Agreement that are required
to be performed or complied with by DoCoMo at or prior to the Closing;

          (c) DoCoMo shall have delivered to AT&T and AT&T Wireless a
certificate of an executive officer of DoCoMo certifying as to the matters set
forth in paragraph (a) and paragraph (b) of this Section 4.3; and

          (d) DoCoMo shall have executed and delivered the Investor Agreement
and the Warrant Agreement and each such agreement shall be in full force and
effect or shall become so by virtue of the Closing.

                                    ARTICLE V

                                   TERMINATION

          Section 5.1 GROUNDS FOR TERMINATION. This Agreement may be terminated
only as follows:

          (a) MUTUAL AGREEMENT. At any time, by the mutual written agreement of
the respective boards of directors of DoCoMo and AT&T;

          (b) EXPIRATION. If the transactions contemplated by this Agreement are
not consummated on or before March 31, 2001 (which date shall be extended to
August 15, 2001 in the event that the failure to consummate the Investment on or
prior to March 31, 2001 is due to the failure of any condition set forth in
Section 4.1), then any party hereto (other than any party (treating DoCoMo and
its Designees as a single party, and treating AT&T and AT&T Wireless as a single
party) whose failure to comply with such party's obligations under this
Agreement shall have caused the delay in Closing, and other than any party that
has failed to use such party's reasonable best efforts to consummate the
transactions contemplated by this Agreement), may terminate this Agreement by
sending written notice to each other party to this Agreement.

          (c) CONTRAVENTION OF LAW. If any of the conditions set forth in
Section 4.1 becomes permanently incapable of being satisfied by virtue of any
order, decree or ruling or any other action taken by any Governmental Entity
that is final and nonappealable, then any party to this Agreement (other than
any party (treating DoCoMo and its Designees as a single party, and treating
AT&T and AT&T Wireless as a single party) whose failure to comply with such
party's obligations under this Agreement shall have caused such failure to occur
or who has failed to use such party's reasonable best efforts

                                       24

<PAGE>

to cause any such order, decree or ruling to be lifted, reversed or vacated),
may terminate this Agreement.

          Section 5.2 EFFECT OF TERMINATION. If this Agreement is terminated
pursuant to Section 5.1, such termination shall be without liability of any
party to any other party to this Agreement; PROVIDED, HOWEVER, that nothing
herein shall relieve any party from liability for any breach prior to such
termination.

                                   ARTICLE VI

                                 INDEMNIFICATION

          Section 6.1 INDEMNIFICATION OBLIGATIONS OF AT&T AND AT&T WIRELESS.
Subject to the limitations set forth in this Article VI:

          (a) AT&T shall indemnify DoCoMo, its Designees and each of DoCoMo's
officers, directors, employees, shareholders, representatives and agents (the
"DoCoMo Indemnified Persons") against and hold them harmless from all Losses
arising out of any breach of any of AT&T's representations or warranties
contained in Section 2.1 (a)(i); Section 2.1(b), insofar as the breach relates
to the Certificate of Incorporation or AT&T's by-laws; Section 2.1(c), insofar
as the breach relates to AT&T; the first sentence of Section 2.1(d); Section
2.1(f), insofar as the breach relates to the New Tracking Stock or the Current
Wireless Tracking Stock; Section 2.1(p), insofar as the breach relates to AT&T;
and Section 2.1(q)(ii); PROVIDED, HOWEVER, that, solely for purposes of this
Section 6.1, in determining whether there has been a breach of a representation
or warranty all materiality qualifiers contained in such representation or
warranty will be disregarded, but no representation or warranty shall be deemed
breached to the extent resulting from the impact of (i) changes in laws of
general applicability or interpretations thereof by Governmental Entities, (ii)
changes in generally applicable provisions of GAAP or (iii) changes in general
economic conditions affecting companies in the wireless telecommunications
industry generally.

          (b) AT&T Wireless shall indemnify DoCoMo Indemnified Persons against
and hold them harmless from all Losses arising out of any breach of any of the
representations or warranties contained in Section 2.1 other than those
described in paragraph (a) of this Section 6.1; PROVIDED, HOWEVER, that solely
for purposes of this Section 6.1, in determining whether there has been a breach
of a representation or warranty all materiality qualifiers contained in such
representation or warranty will be disregarded, but no representation or
warranty shall be deemed breached to the extent resulting from the impact of (i)
changes in laws of general applicability or interpretations

                                       25

<PAGE>

thereof by Governmental Entities, (ii) changes in generally applicable
provisions of GAAP or (iii) changes in general economic conditions affecting
companies in the wireless telecommunications industry generally.

          (c) AT&T GUARANTEE. AT&T hereby irrevocably guarantees and promises to
pay the obligations of AT&T Wireless under Section 6.1(b) upon the failure of
AT&T Wireless to make any payment due to DoCoMo under Section 6.1(b).
Notwithstanding the foregoing, (i) in the event that AT&T Wireless contests its
liability under Section 6.1(b) with respect to a claim by DoCoMo hereunder, AT&T
shall have no obligation to make such payment with respect to the contested
portion of such obligation until AT&T Wireless's liability shall have been
resolved by a final and unappealable determination or until the parties shall
have resolved their dispute as to such liability and AT&T Wireless thereafter
fails to make such payment and (ii) in any event, AT&T shall have no obligation
to make such payment unless DoCoMo shall have used commercially reasonable
efforts to collect payment from AT&T Wireless. In the event AT&T makes any
payment to DoCoMo pursuant to this guarantee, AT&T Wireless shall be obligated
to reimburse and indemnify AT&T for such payment (including any costs incurred
by AT&T), PROVIDED that AT&T hereby agrees that any such liability or obligation
is hereby subordinated and made junior to all obligations and liabilities of
AT&T Wireless to DoCoMo under this Section 6.1 and that AT&T will not receive or
retain any payments with respect to AT&T Wireless's liabilities or obligations
as a result of such guarantee until the prior indefeasible payment in full of
AT&T Wireless's obligations to DoCoMo under this Section 6.1.

          Section 6.2 DOCOMO'S INDEMNIFICATION OBLIGATIONS. Subject to the
limitations set forth in this Article VI, DoCoMo shall indemnify AT&T and AT&T
Wireless and each of their respective officers, directors, shareholders,
representatives and agents (the "AT&T Indemnified Persons") against and hold
them harmless from Losses arising out of any breach of any of DoCoMo's
representations and warranties contained in this Agreement PROVIDED, HOWEVER,
that, solely for purposes of this Section 6.2, in determining whether there has
been a breach of a representation or warranty all materiality qualifiers
contained in such representation or warranty will be disregarded, but no
representation or warranty shall be deemed breached to the extent resulting from
the impact of (i) changes in laws of general applicability or interpretations
thereof by Governmental Entities, (ii) changes in generally applicable
provisions of GAAP or (iii) changes in general economic conditions affecting
companies in the wireless telecommunications industry generally.

          Section 6.3 LIMITATIONS ON INDEMNITY. No party shall be required to
make any payment with respect to its indemnification obligations under this
Article VI until such time as the obligations to the DoCoMo Indemnified Persons,
on the one hand, or the

                                       26
<PAGE>

AT&T Indemnified Persons, on the other hand, exceed $200 million in the
aggregate (the "Deductible"); provided that once such Losses exceed the
Deductible, the indemnifying party shall be responsible for all amounts in
excess thereof; provided further that no party hereunder shall be required to
make any payment hereunder to the extent that the AT&T Indemnified Persons'
Losses (with respect to the obligation of DoCoMo) or the DoCoMo Indemnified
Persons' Losses (with respect to the obligations of AT&T and AT&T Wireless)
exceed $5 billion (the "Maximum Amount"). In addition, the amounts payable by
AT&T with respect to its obligation to guarantee the indemnification obligations
of AT&T Wireless under Section 6.1(c) and its indemnification obligations under
Section 6.1(a) shall not in any event exceed $3.65 billion in the aggregate.
Notwithstanding the foregoing, the limitation imposed by the Maximum Amount
shall not apply to a breach of the representation and warranty set forth in the
first sentence of Section 2.1(f).

          Section 6.4 METHOD OF ASSERTING CLAIMS, ETC. All claims for
indemnification by any AT&T Indemnified Person or DoCoMo Indemnified Person
(each an "Indemnified Party") shall be asserted and resolved as set forth in
this Section 6.4. Any Indemnified Party seeking indemnity pursuant to Section
6.1 or Section 6.2 shall notify in writing the party from whom indemnification
is sought (the "Indemnifying Party") of such demand for indemnification. The
Indemnifying Party shall have thirty (30) days from the personal delivery or
mailing of such notice (the "Notice Period") to notify the Indemnified Party (i)
whether or not the Indemnifying Party disputes the liability of the Indemnifying
Party to the Indemnified Party hereunder with respect to such claim or demand
and (ii) whether or not it desires to defend the Indemnified Party against such
claim or demand with respect to a claim or demand based on a third party claim
(a "Third Party Claim"). In the event that the Indemnifying Party notifies the
Indemnified Party within the Notice Period that, with respect to a Third Party
Claim, it desires to defend the Indemnified Party against such Third Party
Claim, the Indemnifying Party shall have the right to defend the Indemnified
Party at the Indemnifying Party's sole cost and expense and with counsel (plus
local counsel if appropriate) reasonably satisfactory to the Indemnified Party.
If the Indemnifying Party's right to assume the defense is exercised, the
Indemnifying Party shall be deemed to have waived all rights to contest its
liability to the Indemnified Party in respect of such Third Party Claim. No
Indemnifying Party shall, without the prior written consent of the Indemnified
Party, compromise or consent to entry of any judgment or enter into any
settlement agreement with respect to any action or proceeding in respect of
which indemnification is sought under Sections 6.1 or 6.2 (whether or not the
Indemnified Party is an actual or potential party thereto), unless such
compromise, consent or settlement includes an unconditional release of the
Indemnified Party to any material injunctive relief or other material equitable
remedy and does not include a statement or admission of fault, culpability or a
failure to act, by or on behalf of the Indemnified Party. If the right to assume
and control

                                       27
<PAGE>

the defense is exercised, the Indemnified Party shall have the right to
participate in, but not control, such defense at its own expense and the
Indemnifying Party's indemnity obligations shall be deemed not to include
attorneys' fees and litigation expenses incurred in such participation by the
Indemnified Party after the assumption of the defense by the Indemnifying Party
in accordance with the terms hereof; PROVIDED, HOWEVER, that the Indemnified
Parties collectively shall be entitled to employ one firm or separate counsel
(plus local counsel if appropriate) to represent the Indemnified Party if, in
the opinion of counsel to each Indemnified Party seeking to employ such separate
counsel, a conflict of interest between such Indemnified Party or Parties and
the Indemnifying Party exists in respect of such claim and in each such event,
the fees, costs and expenses of one such firm or separate counsel (plus one
local counsel per jurisdiction if appropriate) shall be paid in full by the
Indemnifying Party. If the Indemnifying Party has not elected to assume the
defense of a Third Party Claim within the Notice Period, the Indemnified Party
may defend and settle the claim for the account and cost of the Indemnifying
Party; PROVIDED, that the Indemnified Party will not settle the Third Party
Claim without the prior written consent of the Indemnifying Party, which consent
shall not be unreasonably withheld. The Indemnifying Party will promptly pay, or
reimburse the Indemnified Party for payment of, all costs and expenses
(including reasonable fees and expenses of one counsel plus one local counsel
per jurisdiction, if appropriate) incurred in the defense thereof. The
Indemnified Party shall cooperate with the Indemnifying Party and, subject to
obtaining proper assurances of confidentiality and privilege, shall make
available to the Indemnifying Party all pertinent information under the control
of the Indemnified Party.

          Section 6.5 EXCLUSIVE REMEDY; SURVIVAL

          (a) The indemnity provided herein shall be the sole and exclusive
remedy with respect to any and all claims for Losses sustained or incurred
arising out of a breach of a representation or warranty contained in this
Agreement, except in the case of any claim based on fraud or intentional
misrepresentation; PROVIDED, HOWEVER, that nothing in this Section 6.5 shall be
construed to affect in any manner the rights of DoCoMo or one or more Designees
to exercise the rights contained in Sections 3.2, 3.3, 4.3 or 4.4 of the
Investor Agreement; PROVIDED FURTHER that nothing contained herein shall affect
DoCoMo's rights as a shareholder of AT&T following the Closing or as a
stockholder of AT&T Wireless following consummation of the Spin-off.

          (b) All indemnification obligations under this Article VI shall
terminate and expire on, and no action or proceedings seeking damages or other
relief for breach of any part thereof shall be commenced after, the thirtieth
(30th) day following completion of the first year-end audit of AT&T Wireless
after the date of the Spin-off or, if earlier, the thirtieth (30th) day
following completion of the second year-end audit of the Wireless Group
following the Closing; PROVIDED, HOWEVER, that the representations and
warranties

                                       28
<PAGE>

contained in the first sentence of Section 2.1(f) shall expire only when the
applicable statute of limitations shall have run; AND PROVIDED FURTHER, that any
claim that has been asserted by notice to the other party in such detail that
the claim in question could reasonably be ascertained therefrom and that is
pending or unresolved at the end of such applicable period shall continue to be
covered by this Article VI notwithstanding any applicable expiration of the
indemnification obligations set forth in Article VI until such matter is finally
terminated or otherwise resolved by the parties or by arbitration proceedings
provided for in Section 8.11, or, if such proceedings are unavailable or
inapplicable, by a final and nonappealable judgment of a court of competent
jurisdiction and any amounts payable hereunder are finally determined and paid.

                                   ARTICLE VII

                               CERTAIN DEFINITIONS

          Section 7.1 CERTAIN DEFINITIONS. For all purposes of this Agreement,
except as otherwise expressly provided or unless the context otherwise requires:

          "AFFILIATE" shall mean a Person that directly, or indirectly through
one or more intermediaries, controls, or is controlled by, or is under common
control with, a specified Person; PROVIDED, HOWEVER, that for so long as At Home
Corporation, a Delaware corporation, or Liberty Media Corporation, a Delaware
corporation, and each other corporation constituting part of the Liberty Media
Group as defined in the Certificate of Incorporation, and their successors and
assigns ("AT HOME" and "LIBERTY MEDIA," respectively) has any public
stockholders (directly, or through a tracking stock or similar concept), At Home
or Liberty Media, as the case may be, and any Affiliates or Subsidiaries of
Liberty Media, At Home or any of their respective Subsidiaries shall not be
treated as or deemed to be Affiliates of AT&T or of any of AT&T's Subsidiaries
or Affiliates for purposes hereof. For the purposes of this definition,
"control" (including, with correlative meanings, the terms "controlling",
"controlled by" and "under common control with"), as applied to any Person,
means the possession, directly or indirectly, of the power to direct or cause
the direction of the management and policies of that Person, whether through the
ownership of voting securities or by contract or otherwise.

          "AGREEMENT" shall have the meaning set forth in the preamble hereof.

          "ALLIANCE" shall have the meaning set forth in the Investor Agreement.

          "AT&T" shall have the meaning set forth in the preamble hereof.

                                       29
<PAGE>

          "AT&T INDEMNIFIED PERSONS" shall have the meaning set forth in Section
6.2.

          "AT&T REPORTS" shall have the meaning set forth in Section 2.1(g).

          "AT&T STOCK OPTION PLANS" shall mean the 1997 Long-Term Incentive Plan
of AT&T and any other employee benefit plan of AT&T under which awards based on
Current Wireless Tracking Stock have been or may be issued.

          "AT&T WIRELESS COMMON STOCK" shall mean the common stock, par value
$0.01 per share, of AT&T Wireless as of and following the Spin-off.

          "AT&T WIRELESS" shall have the meaning set forth in the preamble
hereto.

          "AUTHORIZATION" shall mean any franchise, license, authorization,
consent, permit, waiver, approval, qualification or registration of, with or
from the FCC, any state public utility or public service commission, or any
other Governmental Entity.

          "BUSINESS DAY" shall mean any day other than a Saturday, Sunday or a
legal holiday in New York City, New York or Tokyo, Japan, or any other day on
which commercial banks in those locations are authorized by law or governmental
decree to close; provided that, for the purposes of the Closing or determination
of the Closing Date, Business Day shall also exclude any Saturday, Sunday or
legal holiday in London, England, or any other day on which commercial banks in
London, England are authorized by law or governmental decree to close.

          "CERCLA" shall have the meaning set forth in Section 2.1(r).

          "CERTIFICATE OF AMENDMENT" shall have the meaning set forth in the
recitals.

          "CERTIFICATE OF INCORPORATION" shall mean AT&T's certificate of
incorporation, filed by the Department of State of the State of New York on
March 3, 1885, as amended and in effect on the date hereof.

          "CLASS A LIBERTY MEDIA GROUP COMMON STOCK" and "CLASS B LIBERTY MEDIA
GROUP COMMON STOCK" shall have the meanings ascribed thereto in the Certificate
of Incorporation.

          "CLOSING" shall have the meaning set forth in Section 1.2.

          "CLOSING DATE" shall have the meaning set forth in Section 1.2.

                                       30
<PAGE>

          "CODE" shall have the meaning set forth in Section 2.1(o)(i).

          "COMMON STOCK" shall have the meaning ascribed thereto in the
Certificate of Incorporation.

          "COMMON STOCK GROUP" shall mean the Common Stock Group as defined in
the Certificate of Incorporation as in effect on the date hereof.

          "COMMUNICATIONS ACT" shall mean the Communications Act of 1934 and
Telecommunications Act of 1996, both as amended from time to time, and all rules
and regulations promulgated under either thereof.

          "CURRENT WIRELESS TRACKING STOCK" shall have the meaning set forth in
the recitals hereto.

          "DEDUCTIBLE" shall have the meaning set forth in Section 6.3.

          "DESIGNEE" shall have the meaning set forth in Section 8.2. Each party
that is a Designee at any relevant time shall be deemed to be a party to this
Agreement for all purposes hereof.

          "DISCLOSURE SCHEDULE" OR "SCHEDULE" shall mean either of the
disclosure schedules attached to this Agreement.

          "DOCOMO" shall have the meaning set forth in the preamble hereof.

          "DOCOMO INDEMNIFIED PERSONS" shall have the meaning set forth in
Section 6.1(a).

          "ECONOMIC INTERESTS" shall have the meaning set forth in the Investor
Agreement.

          "ERISA" shall have the meaning set forth in Section 2.1(o)(i).

          "ERISA AFFILIATE" shall have the meaning set forth in Section
2.1(o)(ii).

          "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, or any
successor federal statute, and the rules and regulations promulgated thereunder,
all as amended, and as the same may be in effect from time to time.

                                       31
<PAGE>

          "FCC" shall mean the United States Federal Communications Commission,
or any other similar or successor agency of the Federal government administering
the Communications Act.

          "GAAP" means generally accepted accounting principles in the United
States (with respect to AT&T or AT&T Wireless) or in Japan (with respect to
DoCoMo), as applicable.

          "GOVERNMENTAL ANTITRUST ENTITY" shall have the meaning set forth in
Section 3.6(c).

          "GOVERNMENTAL ENTITY" shall mean any court, administrative agency or
commission or other federal, state, foreign or local governmental authority or
instrumentality.

          "HSR ACT" shall mean the Hart-Scott-Rodino Antitrust Improvements Act
of 1976, as amended.

          "INDEMNIFIED PARTY" shall have the meaning set forth in Section 6.4.

          "INDEMNIFYING PARTY" shall have the meaning set forth in Section 6.4.

          "INTELLECTUAL PROPERTY" shall have the meaning set forth in Section
2.1(k).

          "INVESTMENT" shall mean the purchase by DoCoMo (or one or more
Designees) of the shares of New Tracking Stock and the Warrants contemplated by
this Agreement.

          "INVESTOR AGREEMENT" shall have the meaning set forth in the recitals.

          "LETTER AGREEMENT" shall have the meaning set forth in the recitals
hereto.

          "LIEN" shall mean any mortgage, pledge, security interest, lien,
charge, encumbrance, equity, claim, option, easement, right of way, right of
refusal, tenancy, right or restriction on transfer of any nature whatsoever.

          "LOSSES" shall mean any and all fines, liabilities, judgments, claims,
losses, costs, expenses, or damages, including in each case (but without
duplication of any provision hereof), interest, penalties, reasonable attorneys'
fees and reasonable costs of investigations and litigation.

          "MAXIMUM AMOUNT" shall have the meaning set forth in Section 6.3.

                                       32
<PAGE>

          "NEW TRACKING STOCK" shall have the meaning set forth in the recitals
hereto.

          "NOTICE PERIOD" shall have the meaning set forth in Section 6.4.

          "PENSION PLAN" shall have the meaning set forth in Section 2.1(o)(ii).

          "PERMITTED SECURITIES" shall have the meaning set forth in Section
3.2(b).

          "PERSON" shall mean a legal person, including any individual,
corporation, company, partnership, joint venture, association, joint-stock
company, trust, limited liability company or unincorporated association or any
other entity or organization, including a government or any agency or political
subdivision thereof, or any other entity of whatever nature.

          "PLAN" shall have the meaning set forth in Section 2.1(o)(i).

          "PRE-CLOSING PREEMPTIVE RIGHT" shall have the meaning set forth in
Section 3.2(b).

          "PREFERRED STOCK" shall have the meaning set forth in the Certificate
of Incorporation.

          "PURCHASE PRICE" shall have the meaning set forth in Section 1.1.

          "RELATED AGREEMENTS" shall mean the Investor Agreement, the Warrant
Agreement, that certain letter agreement, dated as of November 30, 2000,
executed and delivered among DoCoMo, AT&T and AT&T Wireless concurrently with
the execution and delivery of the Letter Agreement, that certain roaming side
letter, dated the date hereof, executed and delivered among DoCoMo, AT&T and
AT&T Wireless (and any letters or schedules referred to therein) and the
Certificate of Amendment.

          "RIGHTS" shall mean, with respect to any Person, securities or
obligations convertible into or exercisable or exchangeable for, or giving any
other Person any right to subscribe for or acquire, or any options, calls or
commitments relating to, or any stock appreciation right or other instrument the
value of which is determined in whole or in part by reference to the market
price or value of, shares of capital stock of such first Person.

          "SEC" shall mean the Securities and Exchange Commission.

                                       33
<PAGE>

          "SECURITIES" shall have the meaning set forth in the recitals hereto.

          "SECURITIES ACT" shall mean the Securities Act of 1933, and any
similar or successor federal statute, and the rules and regulations promulgated
thereunder, all as amended, and as the same may be in effect from time to time.

          "SEPARATION AGREEMENTS" shall have the meaning set forth in Section
2.1(e).

          "SPIN-OFF" shall mean the spin-off of AT&T Wireless in accordance with
the Separation Agreements as amended or revised to the extent not prohibited by
the Investor Agreement. The Spin-off shall be deemed to have been consummated
following completion of the exchange of AT&T Wireless Common Stock for Current
Wireless Tracking Stock and the distribution of the remaining shares of AT&T
Wireless Common Stock to holders of common stock of AT&T. For all purposes of
this Agreement, the Spin-off shall not be a "transaction contemplated by this
Agreement."

          "SUBSIDIARY" shall mean, with respect to any Person, any other Person
more than fifty percent (50%) of the shares of the voting stock or other voting
interests of which are owned or controlled, or the ability to select or elect
more than fifty percent (50%) of the directors or similar managers is held,
directly or indirectly, by such first Person or one or more of its Subsidiaries
or by such first person and one or more of its Subsidiaries; PROVIDED, HOWEVER,
that for so long as At Home or Liberty Media, as the case may be, has any public
stockholders (directly, or through a tracking stock or similar concept), At Home
or Liberty Media, as the case may be, and their respective Subsidiaries shall
not be treated as or deemed to be Subsidiaries of AT&T or of any of AT&T's
Subsidiaries or Affiliates for purposes hereof. A Subsidiary that is directly or
indirectly wholly owned by another Person except for directors' qualifying
shares shall be deemed wholly owned for the purposes of this Agreement.

          "TAX" shall have the meaning set forth in Section 2.1(n)(iv).

          "TAX RETURN" shall have the meaning set forth in Section 2.1(n)(iv).

          "THIRD PARTY CLAIM" shall have the meaning set forth in Section 6.4.

          "WARRANTS" shall have the meaning set forth in the recitals hereto.

          "WARRANT AGREEMENT" shall mean the Warrant Agreement with respect to
the issuance of the Warrants in the form attached hereto as Exhibit B.

                                       34
<PAGE>

          "WIRELESS GROUP" shall mean the Wireless Group as defined in the
Certificate of Incorporation of AT&T as in effect on the date hereof.

          "WIRELESS GROUP ALLOCATION FRACTION" shall have the meaning set forth
in the Certificate of Incorporation as in effect on November 30, 2000.

          "WIRELESS GROUP SUBSIDIARY" shall mean any Subsidiary of AT&T Wireless
and any Subsidiary of AT&T that is engaged in the business of the Wireless
Group.

          "WIRELESS INTELLECTUAL PROPERTY" shall have the meaning set forth in
Section 2.1(k).

          "WIRELESS MATERIAL ADVERSE EFFECT" shall mean any effect that (a) is
material and adverse to the financial condition, results of operations or
business of AT&T Wireless or the Wireless Group Subsidiaries, taken as a whole
or the Wireless Group, excluding the impact of (i) changes in laws of general
applicability or interpretations thereof by Governmental Entities, (ii) changes
in generally applicable provisions of GAAP or (iii) changes in general economic
conditions affecting companies in the wireless telecommunications industry
generally, or (b) would materially impair the ability of AT&T or AT&T Wireless
to perform its obligations in all material respects under this Agreement, the
Investor Agreement or the Warrant Agreement or to consummate the transactions
contemplated this Agreement, the Investor Agreement or the Warrant Agreement.

          Section 7.2 INTERPRETATION. When a reference is made in this Agreement
to an Article, Section, Exhibit or Schedule, such reference is to an Article or
Section of, or an Exhibit or Schedule to, this Agreement unless otherwise
indicated. The table of contents and headings contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Whenever the words "include," "includes" and
"including" are used in this Agreement, they are deemed to be followed by the
words "without limitation." For all purposes of this Agreement, except as
otherwise expressly provided or unless the context otherwise requires, (a) the
terms defined include the plural as well as the singular, (b) all accounting
terms not otherwise defined herein have the meanings assigned under GAAP, and
(c) the words "herein," "hereof" and "hereunder" and other words of similar
import refer to this Agreement as a whole and not to any particular Article,
Section or other subdivision.

                                  ARTICLE VIII

                                       35
<PAGE>

                                  MISCELLANEOUS

          Section 8.1 AMENDMENTS; WAIVER. This Agreement may be amended only by
an agreement in writing executed by DoCoMo (on behalf of itself and all of its
Designees), AT&T and AT&T Wireless; provided that, after the Spin-off, this
Agreement may be amended by an agreement in writing executed by AT&T Wireless
and DoCoMo (on behalf of itself and all of its Designees) to the extent (but
only to the extent) such amendment does not affect any rights or obligations of
AT&T. Any party may waive in whole or in part any benefit or right provided to
it under this Agreement, such waiver being effective only if contained in a
writing executed by the waiving party. No failure by any party to insist upon
the strict performance of any covenant, duty, agreement or condition of this
Agreement or to exercise any right or remedy consequent upon breach thereof
shall constitute a waiver of any such breach or of any other covenant, duty,
agreement or condition, nor shall any delay or omission of any party to exercise
any right hereunder in any manner impair the exercise of any such right accruing
to it thereafter.

          Section 8.2 ASSIGNMENT. Except as otherwise provided in this Section
8.2, neither this Agreement nor any of the rights, interests or obligations
hereunder shall be assigned by any of the parties hereto, in whole or in part
(whether by operation of law or otherwise), without the prior written consent of
each of the other parties PROVIDED, HOWEVER, that prior to the Closing, by
giving three (3) Business Days' prior written notice to the other parties,
DoCoMo may assign its rights to purchase the shares of New Tracking Stock and to
receive Warrants in each case pursuant to Section 1.1 hereof without the prior
written consent of the other parties hereto to one or more wholly-owned
Subsidiaries of DoCoMo that has agreed with AT&T and AT&T Wireless to be bound
by the terms hereof and of the Investor Agreement as if such Subsidiary or
Subsidiaries were itself or themselves DoCoMo (each, a "Designee"); PROVIDED
FURTHER, HOWEVER, that following the Closing DoCoMo may assign any of its
on-going rights hereunder to any "Designee" as that term is used in the Investor
Agreement that has executed and is a party to the Investor Agreement; and
PROVIDED FURTHER, HOWEVER, that no assignment shall limit or affect the
assignor's obligations hereunder, and that DoCoMo shall cause each Designee to
execute the Investor Agreement at or prior to Closing and each "Designee" as
that term is used in the Investor Agreement to execute the Investor Agreement at
or prior to the time that such entity becomes a "Designee" as such term is used
in the Investor Agreement. Subject to the preceding sentence, this Agreement
will be binding upon, inure to the benefit of and be enforceable by the parties
and their respective successors and assigns. Any attempted assignment in
violation of this Section 8.2 shall be void.

          Section 8.3 NOTICES. Except as otherwise provided in this Agreement,
all notices, requests, claims, demands, waivers and other communications
hereunder shall be in writing and shall be deemed given when so delivered by
hand, or if mailed, five (5)

                                       36
<PAGE>

Business Days after mailing (three (3) Business Days in the case of express mail
or overnight courier service), or when received by facsimile transmission if
promptly confirmed, as follows:

                  If to AT&T:

                  AT&T Corp.
                  295 North Maple Avenue
                  Bashing Ridge, New Jersey  07920
                  Attention: Marilyn J. Wasser,
                                 Secretary and Vice President - Law
                  Telefax:    (908) 221-6618

                  With a copy to:

                  Wachtell, Lipton, Rosen & Katz
                  51 West 52nd Street
                  New York, NY  10019
                  Attention:   Steven A. Rosenblum
                               David M. Silk
                  Telefax: (212) 403-2000

                  To AT&T Wireless:

                  7277 164th Avenue, NE
                  Redmond, Washington  98051
                  Attention:   Greg Landis
                               General Counsel
                  Telefax:     (425) 580-8050

                  With a copy to:
                  Wachtell, Lipton, Rosen & Katz
                  51 West 52nd Street
                  New York, NY  10019
                  Attention:   Steven A. Rosenblum
                               David M. Silk
                  Telefax: (212) 403-2000

                                       37

<PAGE>

                  To DoCoMo or any Designee:

                  NTT DoCoMo, Inc.
                  Sanno Park Tower - 41st Floor
                  11-1, Nagata-cho 2-chome
                  Chiyoda-ku
                  Tokyo 100-6150
                  Attention:  Global Business Department,
                               Kiyoyuki Tsujimura,
                               Managing Director
                  Telefax:  81-3-5156-0204

                  With a copy to:

                  Sullivan & Cromwell
                  1888 Century Park East
                  Los Angeles, CA  90067
                  Attention:  Alison S. Ressler
                  Telefax:  (310) 712-8800

or to such other address or facsimile number as such other party may, from time
to time, designate in a written notice given in a like manner.

          Section 8.4 SEVERABILITY. If any term or provision of this Agreement
or any application thereof shall be declared or held invalid, illegal or
unenforceable, in whole or in part, whether generally or in any particular
jurisdiction, such provision shall be deemed amended to the extent, but only to
the extent, necessary to cure such invalidity, illegality or unenforceability,
and the validity, legality and enforceability of the remaining provisions, both
generally and in every other jurisdiction, shall not in any way be affected or
impaired thereby.

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

          Section 8.6 GOVERNING LAW. This Agreement shall be governed by and
construed and enforced in accordance with the laws of the State of New York
applicable to contracts executed in and to be performed entirely within such
State, without giving effect to the conflicts of law principles thereof that
would govern, construe or enforce the Agreement under laws other than the laws
of the State of New York.

                                       38
<PAGE>

          Section 8.7 ENTIRE AGREEMENT. This Agreement, the Related Agreements
and the schedules and exhibits attached to any such documents constitute the
entire agreement among DoCoMo, each Designee, AT&T and AT&T Wireless with
respect to the subject matter hereof. This Agreement and the Related Agreements
supersede all prior agreements with respect to the subject matter hereof, and
supersede the Letter Agreement in its entirety.

          Section 8.8 PUBLICITY. AT&T, AT&T Wireless and DoCoMo agree that the
initial press releases announcing the Investment and the other transactions
contemplated hereby shall be jointly coordinated and agreed. Thereafter, until
the fifteenth (15th) day following the Closing Date, DoCoMo and AT&T agree to
consult with each other before issuing any press release or making any public
statement with respect to the agreements and transactions contemplated by this
Agreement and, subject to the immediately following sentence, will not issue any
such press release or make any such public statement without the prior consent
of the other party, which consent shall not be unreasonably withheld or delayed.
Notwithstanding the foregoing, any such press release or public statement as may
be required by applicable law or any listing agreement with any applicable
securities exchange may be issued without such consent, if the party making such
release or statement has used its reasonable efforts to consult with the other
party.

          Section 8.9 EXPENSES. Subject to Article VI, AT&T and AT&T Wireless,
on the one hand, and DoCoMo and all of its Designees, on the other, each shall
pay their own expenses incident to the negotiation, preparation and performance
of this Agreement and the transactions contemplated hereby, including but not
limited to the fees, expenses and disbursements of their respective investment
bankers, accountants and counsel.

          Section 8.10 NO THIRD PARTY BENEFICIARIES. Nothing in this Agreement,
expressed or implied, is intended to confer upon any person, other than the
parties hereto or their respective successors (including, without limitation,
each Designee and each "Designee" as that term is used in the Investor Agreement
and that has executed and is a party to the Investor Agreement), any rights,
remedies, obligations or liabilities under or by reason of this Agreement.

          Section 8.11 ARBITRATION. The parties (including each Designee)
encourage the prompt and equitable settlement of all controversies or claims
between or among the parties arising out of or relating to this Agreement, the
Investor Agreement and the Warrant Agreement including any claim based on or
arising from an alleged tort, and agree as follows:

                                       39
<PAGE>

          (i) Any controversy or claim arising out of or relating to the
     above-referenced Agreements ("Arbitration Claims"), including Arbitration
     Claims arising under Article VI, shall be determined by arbitration in
     accordance with the International Arbitration Rules of the American
     Arbitration Association or any successor organization thereof and Title 9
     of the U.S. Arbitration Act in New York, New York.

          (ii) Within fifteen (15) days after the delivery in accordance with
     Section 8.3 hereof by any party to the other (treating AT&T and AT&T
     Wireless as one party and treating DoCoMo and all of its Designees as one
     party) of written notice of the commencement of arbitration, each party
     shall select one person to act as an arbitrator; and the two selected shall
     select a third arbitrator within fifteen (15) days of the second
     arbitrator's appointment. If the arbitrators selected by the parties are
     unable or fail to agree upon the third arbitrator, the third arbitrator
     shall be selected by the American Arbitration Association pursuant to its
     rules. Arbitration proceedings shall be conducted in the English language.

          (iii) The parties shall agree upon what, if any, discovery shall be
     permitted. If the parties do not agree on the extent and form of discovery
     within ten (10) days after the appointment of the third arbitrator, then
     there shall be neither discovery nor the issuance of subpoenas except as
     otherwise expressly directed in accordance with the unanimous determination
     of the arbitrators.

          (iv) The powers of the arbitrators to fashion remedies hereunder shall
     be no broader than the powers to award legal and equitable remedies
     available to a court, unless the parties expressly state elsewhere in the
     relevant above-referenced Agreements that the arbitrators may order broader
     or narrower legal and equitable remedies. The arbitrators shall not have
     the power to award any punitive damages, and each party expressly waives
     any claim thereto. This Section 8.11 shall govern if any conflict arises
     between this Section and any other remedy terms in the above-referenced
     Agreements.

          (v) The arbitrators shall make their award within thirty (30) days
     after the conclusion of arbitration hearings. Subject to paragraph (vi) of
     this Section 8.11, the award shall be final and binding, and judgment
     therein may be entered by any court having jurisdiction thereof.

                                       40
<PAGE>

          (vi) Within thirty (30) days after receipt of any award (which shall
     not be binding if an appeal is taken hereunder), any party (treating AT&T
     and AT&T Wireless as one party and treating DoCoMo and all of its Designees
     as one party) may notify the American Arbitration Association of its intent
     to appeal to a second three-arbitrator tribunal, selected in the same
     fashion as the initial tribunal (with the 15-day arbitrator selection
     period commencing on the first Business Day after such notification is
     received by the other party). At least two of the three appellate
     arbitrators shall be former judges of state or federal courts. The appeal
     tribunal shall be entitled to adopt the initial award as its own, modify
     the initial award or substitute its own award for the initial award. The
     appeal tribunal shall not modify or replace the initial award except for
     errors of law or because of clear and convincing factual errors. If an
     appeal is taken, the award of the appeal tribunal shall be final and
     binding, and judgment may be entered therein by any court having
     jurisdiction thereof. The review by the appeal tribunal will be completed
     and its order issued within thirty (30) days of the final submission of the
     parties to the panel.

          (vii) The parties (treating AT&T and AT&T Wireless as one party and
     treating DoCoMo and all of its Designees as one Party) shall equally bear
     the costs and fees of the arbitration, including court reporter expenses,
     and each party shall bear its own legal expenses.

          (viii) The parties waive recourse to any court, including all courts
     in the United States and Japan, except for enforcement of this Section 8.11
     or for enforcement of any arbitral award hereunder.

          (ix) The duty of the parties to arbitrate any Arbitration Claim within
     the scope of this Section 8.11 shall survive the expiration or termination
     of this Agreement for any reason.

          Section 8.12 SUBMISSION TO JURISDICTION; WAIVERS. Subject to the
provisions of Section 8.11, each of the parties (including each Designee) hereto
irrevocably agrees that any legal action or proceeding with respect to this
Agreement or the transactions contemplated hereby or for recognition and
enforcement of any judgment in respect hereof or thereof, other than with
respect to any dispute subject to arbitration under Section 8.11 (but including
for enforcement of the arbitration provisions contained in Section 8.11 or any
award resulting therefrom) brought by any other party hereto or its successors
or assigns shall be brought and determined only in the United States District
Court for the Southern District of New York, or in the event (but only in the
event) that such court does not have subject matter jurisdiction over such
action or proceeding, only

                                       41
<PAGE>

in the courts of the State of New York. Each of the parties (including each
Designee) hereto hereby irrevocably submits with regard to any such action or
proceeding for itself and in respect of its property, generally and
unconditionally, to the personal jurisdiction of the aforesaid courts. Each of
the parties hereto hereby irrevocably waives, and agrees not to assert, by way
of motion, as a defense, counterclaim or otherwise, in any action or proceeding
with respect to this Agreement, or the transactions contemplated hereby (a) any
claim that it is not personally subject to the jurisdiction of the above-named
courts for any reason other than the failure to serve in accordance with Section
8.3, (b) that it or its property is exempt or immune from jurisdiction of any
such court or from any legal process commenced in such courts (whether through
service of notice, attachment prior to judgment, attachment in aid of execution
of judgment, execution of judgment or otherwise) and (c) to the fullest extent
permitted by the applicable law, that (i) the suit, action or proceeding in such
court is brought in an inconvenient forum, (ii) the venue of such suit, action
or proceeding is improper and (iii) this Agreement or the subject mater hereof,
may not be enforced in or by such courts.

          Section 8.13 WAIVER OF IMMUNITY. DoCoMo agrees that, to the extent
that it or any of its Subsidiaries or any of its property or the property of its
Subsidiaries is or becomes entitled to any immunity on the grounds of
sovereignty or otherwise based upon its status as an agency or instrumentality
of a government from any legal action, suit or proceeding or from set-off or
counterclaim relating to this Agreement from the jurisdiction of any competent
court or arbitrator, from service of process, from attachment prior to judgment,
from attachment in aid of execution, from execution pursuant to a judgment or an
arbitral award or from any other legal or arbitral process in any jurisdiction,
it, for itself and its property, and for each of its Subsidiaries and its
property, expressly, irrevocably and unconditionally waives, and agrees not to
plead or claim, any such immunity with respect to matters arising with respect
to this Agreement or the subject matter hereof (including any obligation for the
payment of money). DoCoMo agrees that the foregoing waiver is irrevocable and is
not subject to withdrawal in any jurisdiction or under any statute, including
the Foreign Sovereign Immunities Act, 28 U.S.C. ss. 1602 et seq. The foregoing
waiver shall constitute a present waiver of immunity at any time any action is
initiated against DoCoMo with respect to this Agreement or the subject matter
hereof (including any obligation for the payment of money).

          Section 8.14 WAIVER OF JURY TRIAL. AT&T, AT&T Wireless and DoCoMo
hereby waive any right they may have to a trial by jury in respect of any
action, proceeding or litigation directly or indirectly arising out of, under or
in connection with this Agreement or the transactions contemplated hereby.

          Section 8.15 TERMINATION OF CERTAIN OBLIGATIONS. Effective immediately
on consummation of the Spin-off (i) except with respect to its liabilities and
obligations

                                       42
<PAGE>

pursuant to Sections 6.1(a) and 6.1(c) (but subject to the limitations
applicable to such Sections), and except with respect to liabilities arising
from any breach of this Agreement prior to the consummation of the Spin-off,
AT&T shall be released and terminated as a party hereto and shall have no
further liability or obligation hereunder to any party hereto or any other
Person hereby, and this Agreement shall no longer represent an agreement of AT&T
enforceable against AT&T by any other Person and (ii) except with respect to its
liabilities and obligations pursuant to Section 6.2 (but subject to the
limitations applicable to Section 6.2) and except with respect to liabilities
arising from any breach of this Agreement prior to the consummation of the
Spin-off, DoCoMo shall be released and have no further liability or obligation
hereunder to AT&T, and this Agreement shall no longer represent an agreement
enforceable by AT&T against DoCoMo or any Designee or successor thereof.

                                       43
<PAGE>

          IN WITNESS WHEREOF, this Agreement has been executed and delivered as
of the date first above written, by the duly authorized representatives of the
parties hereto.

                                AT&T  CORP.

                                By: /s/ C. Michael Armstrong
                                   -------------------------------
                                   Name:   C. Michael Armstrong
                                   Title:  Chairman and Chief Executive Officer

                                NTT DOCOMO, INC.

                                By: /s/ Keiji Tachikawa
                                   -------------------------------
                                   Name:   Keiji Tachikawa
                                   Title:  President and Chief Executive Officer

                                AT&T WIRELESS SERVICES, INC.

                                By: /s/ John D. Zeglis
                                  -------------------------------
                                  Name:   John D. Zeglis
                                  Title:  Chief Executive Officer

                                       44

<PAGE>

                                   EXHIBIT A
                                   ---------

                        FORM OF CERTIFICATE OF AMENDMENT

                                     OF THE

                          CERTIFICATE OF INCORPORATION

                                       OF

                                   AT&T CORP.

                UNDER SECTION 805 OF THE BUSINESS CORPORATION LAW

          Pursuant to the provisions of Section 805 of the BUSINESS CORPORATION
LAW, the undersigned, being the Senior Vice President and Secretary of AT&T
CORP., a New York corporation (the "corporation"), hereby certify that:

                                       I.

          The name of the corporation is AT&T Corp.

                                       II.

          The Certificate of Incorporation of the corporation was filed by the
Department of State on March 3, 1885 under the name American Telephone and
Telegraph Company.

          A Certificate of Amendment of the Certificate of Incorporation was
filed in the office of the Secretary of State of the State of New York on April
20, 1994, changing the name of the corporation to AT&T Corp.

                                      III.

          The Certificate of Incorporation of the corporation is hereby amended
pursuant to authority vested in the Board of Directors by the Certificate of
Incorporation of the corporation, as heretofore amended, and in accordance with
Section 502 of the Business Corporation Law, by the addition of the following
provision, stating the number, designation, relative rights, preferences and
limitations of a series of the corporation's authorized preferred stock
designated as Wireless Group Preferred Tracking Stock.

          1. NUMBER AND DESIGNATION. 1,500,000 shares of the Preferred Stock of
the corporation shall constitute a series designated as "Wireless Group
Preferred Tracking Stock" (the "New Tracking Stock").

<PAGE>

          2. DEFINITIONS. Unless the context otherwise requires, when used in
this Amendment the following terms shall have the meaning indicated.

          "Accrual Period" means, with respect to any calculation of the Cost of
Carry with respect to any shares of New Tracking Stock, the number of days from
the date of initial issuance of such shares of New Tracking Stock to but not
including the Redemption Date.

          "Amendment" means this Certificate of Amendment of the
Certificate.

          "AT&T Wireless" means AT&T Wireless Services, Inc., a Delaware
corporation and a wholly-owned subsidiary of the corporation.

          "AT&T Wireless Common Stock" means the common stock, par value $0.01
per share, of AT&T Wireless as of and following the Spin-off.

          "Board of Directors" means the Board of Directors of the corporation.

          "Certificate" means the corporation's Restated Certificate of
Incorporation as filed by the Department of State on January 10, 1989, as
amended.

          "Class A Liberty Media Group Common Stock" means the Class A Liberty
Media Group Common Stock, par value $1.00 per share, of the corporation.

          "Class B Liberty Media Group Common Stock" means the Class B Liberty
Media Group Common Stock, par value $1.00 per share, of the corporation.

          "Common Stock" means the Common Stock, par value $1.00 per share, of
the corporation.

          "Common Stock Group(W)" shall have the meaning set forth in Article
Third, Part C, paragraph 9 of the Certificate as in effect on the date of this
Amendment.

          "corporation" shall have the meaning set forth in the preamble to this
Amendment.

          "Cost of Carry" shall mean the applicable interest rate set forth on
the table below for the following time periods (expressed in days, based on a
360-day year of twelve 30-day months, except for periods of twelve (12) months
or less which will be

                                      -2-
<PAGE>

expressed in actual days of 365 based on a 360-day year according to the money
market convention).

ACCRUAL PERIOD                                         COST OF CARRY
--------------                                         -------------
90 days or less                                        6.477%
180 days                                               6.348%
360 days                                               6.336%
540 days                                               6.563%
720 days                                               6.475%
1,080 days                                             6.499%
1,440 days                                             6.673%
1,800 days                                             6.647%
2,160 days                                             6.758%
2,520 days or more                                     6.819%

     The interest rate that will apply to any Accrual Period between any two
points in the foregoing table will be an interpolated rate, which interpolated
rate will apply to the entire Accrual Period. As an example only: using the rate
6.475% for 720 days and the rate 6.499% for 1,080 days, then (i) the rate for
900 days (half way between the two points) would be 6.487% (half way between the
two rates); (ii) the rate for 810 days (one quarter of the way between the two
points) would be 6.481% (one quarter of the way between the two rates); and
(iii) the rate for 990 days (three quarters of the way between the two points)
would be 6.493% (three quarters of the way between the two rates). The
applicable interest rate will be compounded over the applicable Accrual Period
based on a semi-annual bond equivalent yield using a 360-day year of twelve
30-day months, except for periods of 12 months or less which will be expressed
in actual days of 365 based on a 360-day year according to the money market
convention.

          "Draft Separation Agreements" means the drafts of the agreements
(and/or term sheets with respect to such agreements) relating to the Spin-off
and the separation of the Wireless Group from the corporation and the schedules
related thereto, in the forms annexed to the Letter Agreement.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended,
or any successor statute, and the rules and regulations promulgated thereunder.

          "Investor Agreement" means the Investor Agreement, dated as of
December 20, 2000, by and among the corporation, AT&T Wireless and NTT DoCoMo,
Inc.

                                      -3-
<PAGE>

          "Letter Agreement" means the Letter Agreement, dated as of November
30, 2000, by and among the corporation, AT&T Wireless and NTT DoCoMo, Inc.,
together with the term sheet attached thereto and the annexes to such term
sheet.

          "Liberty Media Group Common Stock" means, collectively, the Class A
Liberty Media Group Common Stock and the Class B Liberty Media Group Common
Stock.

          "Liquidation Junior Securities" means the Common Stock, the Wireless
Group Common Stock, the Class A Liberty Media Group Common Stock, the Class B
Liberty Media Group Common Stock and each other class of capital stock of the
corporation currently existing or created after the date of this Amendment the
terms of which do not expressly provide that it ranks senior to, or on a parity
with, the New Tracking Stock as to distribution upon involuntary liquidation,
winding-up or dissolution.

          "Liquidation Parity Securities" means each other class of capital
stock of the corporation created after the date of this Amendment the terms of
which expressly provide that such class will rank PARI PASSU to the New Tracking
Stock as to distribution upon involuntary liquidation, winding-up or dissolution
of the corporation.

          "Liquidation Senior Securities" means each other class of capital
stock of the corporation created after the date of this Amendment the terms of
which expressly provide that such class will rank senior to the New Tracking
Stock as to distribution upon involuntary liquidation, winding-up or dissolution
of the corporation.

          "Market Value" shall have the meaning set forth in Article Third, Part
C, paragraph 9 of the Certificate as in effect on the date of this Amendment;
provided that the proviso thereto applicable to shares of Common Stock, Wireless
Group Common Stock and any class of Liberty Media Group Common Stock shall also
be applicable to shares of New Tracking Stock.

          "New Tracking Stock" shall have the meaning set forth in paragraph 1
of this Amendment.

          "New Tracking Stock Tax Event" means receipt by the corporation of an
opinion of tax counsel of the corporation's choice, to the effect that, as a
result of any amendment to, clarification of, or change (including a prospective
change) in, the laws (or any interpretation or application of the laws) of the
United States or any political subdivision or taxing authority thereof or
therein (including enactment of any legislation and the publication of any
judicial or regulatory decision, determination or pronouncement) which
amendment, clarification or change is effective, announced,

                                      -4-
<PAGE>

released, promulgated or issued on or after the date of initial issuance of the
New Tracking Stock, regardless of whether such amendment, clarification or
change is issued to or in connection with a proceeding involving the
corporation, the Common Stock Group(W) or the Wireless Group and whether or not
subject to appeal, there is more than an insubstantial risk that:

          (i) for tax purposes, any issuance of New Tracking Stock would be
     treated as a sale or other taxable disposition by the corporation or any of
     its Subsidiaries of any of the assets, operations or relevant subsidiaries
     to which the New Tracking Stock relates,

          (ii) the existence of the New Tracking Stock would subject the
     corporation, its Subsidiaries or affiliates, or any of their respective
     successors or shareholders to the imposition of tax or to other adverse tax
     consequences, or

          (iii) for tax purposes, either Common Stock or New Tracking Stock is
     not or, at any time in the future, will not be treated solely as capital
     stock of the corporation.

          "Person" shall mean any individual, corporation, partnership, limited
liability company, joint venture, association, joint stock company, trust,
unincorporated organization, government or agency or political subdivision
thereof, or other entity, whether acting in an individual, fiduciary or other
capacity.

          "Preferred Stock" means the preferred stock, par value $1.00 per
share, of the corporation.

          "Redemption Date" shall have the meaning set forth in paragraph 5(c).

          "Securities Purchase Agreement" means the Securities Purchase
Agreement, dated as of December 20, 2000, by and among the corporation, AT&T
Wireless and NTT DoCoMo, Inc..

          "Spin-off" shall mean the spin-off of AT&T Wireless in accordance with
the Draft Separation Agreements, as amended or revised to the extent not
prohibited by the Investor Agreement.

          "Subsidiary" means, with respect to any Person, any corporation,
limited liability company or partnership 50% or more of whose outstanding voting
securities or membership or partnership interests, as the case may be, are,
directly or indirectly, owned by such Person.

                                      -5-
<PAGE>

          "Tax Event" shall have the meaning set forth in Article Third, Part C,
paragraph 9 of the Certificate as in effect on the date of this Amendment.

          "Wireless Group" shall have the meaning set forth in Article Third,
Part C, paragraph 9 of the Certificate as in effect on the date of this
Amendment.

          "Wireless Group Common Stock" means the Wireless Group Common Stock,
par value $1.00 per share, of the corporation.

          3. VOTING RIGHTS.

          (a) Holders of New Tracking Stock shall be entitled to two hundred and
fifty (250) votes per share of New Tracking Stock, subject to adjustment as set
forth in paragraph 3(b) below. Except as may otherwise be required in this
Amendment or in the Certificate (including the terms of any class of series of
Preferred Stock and any resolution or resolutions providing for the
establishment of such class or series pursuant to authority vested in the Board
of Directors by the Certificate) or by the laws of the State of New York, the
holders of shares of Common Stock, the holders of shares of New Tracking Stock,
the holders of shares of Wireless Group Common Stock, the holders of shares of
Class A Liberty Media Group Common Stock, the holders of shares of Class B
Liberty Media Group Common Stock, the holders of shares of each other class of
common shares, if any, entitled to vote thereon, and the holders of shares of
each other class or series of Preferred Stock, if any, entitled to vote thereon,
shall vote as one class with respect to all matters to be voted on by
shareholders of the corporation, and no separate vote or consent of the holders
of shares of Common Stock, the holders of shares of New Tracking Stock, the
holders of shares of Wireless Group Common Stock, the holders of shares of Class
A Liberty Media Group Common Stock, the holders of shares of Class B Liberty
Media Group Common Stock or the holders of shares of any such class of common
shares or any such class or series of Preferred Stock shall be required for the
approval of any such matter.

          (b) If the corporation shall in any manner subdivide (by stock split
or otherwise) or combine (by reverse stock split or otherwise) the outstanding
shares of Common Stock, Liberty Media Group Common Stock or Wireless Group
Common Stock, or pay a stock dividend in shares of any class to holders of that
class or shall otherwise effect a share distribution (as defined in Article
Third, Part C, paragraph 3 of the Certificate) of Common Stock, New Tracking
Stock, Wireless Group Common Stock or Liberty Media Group Common Stock, the per
share voting rights of the New Tracking Stock shall be appropriately adjusted so
as to avoid any dilution in the aggregate voting rights of any one class
relative to the other classes.

                                      -6-
<PAGE>

          4. DIVIDENDS; SHARE DISTRIBUTIONS.

          (a) The holders of the New Tracking Stock shall be entitled to receive
dividends when, as and if declared by the Board of Directors out of funds of the
corporation legally available thereof. So long as any share of New Tracking
Stock remains outstanding, no dividend shall be paid or declared and no
distribution shall be made on any share of Wireless Group Common Stock, unless
dividends shall have first been (or simultaneously shall be) paid to or declared
and set aside for payment on all outstanding shares of New Tracking Stock in an
aggregate amount equal to the product of (i) the per share dividends declared
and to be paid on the Wireless Group Common Stock and (ii) the number of shares
of Wireless Group Common Stock into which all outstanding shares of New Tracking
Stock are convertible immediately prior to the record date of such dividend. So
long as any share of New Tracking Stock remains outstanding, no share
distribution shall be paid or declared and no share distribution shall be made
on any share of Wireless Group Common Stock, unless a share distribution shall
have first have been (or simultaneously shall be) paid to or declared and set
aside for payment on all outstanding shares of New Tracking Stock in an
aggregate amount equal to the product of (i) the per share amount declared and
to be paid on the Wireless Group Common Stock and (ii) the number of shares of
Wireless Group Common Stock into which the New Tracking Stock is convertible
immediately prior to the record date of such share distribution.

          (b) Concurrently with the payment of any dividend on shares of New
Tracking Stock at any time when there are no shares of Wireless Group Common
Stock outstanding, at the election of the Board of Directors, either (x) the
Common Stock Group(W) shall receive from the Wireless Group an aggregate payment
of the same kind of cash and/or property that is the subject of such dividend,
which payment shall be equal to the excess, if any, of (i) the quotient obtained
by dividing (A) the aggregate amount of such dividend, as determined by the
Board of Directors, by (B) the Wireless Group Allocation Fraction, over (ii) the
aggregate amount of such dividend, as so determined, or (y) the Wireless Group
Allocation Fraction will be adjusted as described in paragraph 8 of Article
Third, Part C of the Certificate. Any payment to be made to the Common Stock
Group(W) pursuant to the preceding sentence may, at the discretion of the Board
of Directors, be reflected by an allocation or by a direct transfer of cash or
other property.

          (c) Concurrently with the making of any share distribution with
respect to the New Tracking Stock at any time when there are no shares of
Wireless Group Common Stock outstanding, at the election of the Board of
Directors, either (x) the Common Stock Group(W) shall receive from the Wireless
Group an aggregate payment of the same kind of property that is the subject of
such distribution, which

                                      -7-
<PAGE>

payment shall be equal to the excess, if any, of (i) the quotient obtained by
dividing (A) the aggregate amount of such distribution, as determined by the
Board of Directors, by (B) the Wireless Group Allocation Fraction, over (ii) the
aggregate amount of such dividend, as so determined, or (y) the Wireless Group
Allocation Fraction shall be adjusted as described in paragraph 8 of Article
Third, Part C of the Certificate. Any payment to be made to the Common Stock
Group(W) pursuant to the preceding sentence may, at the discretion of the Board
of Directors, be reflected by an allocation or by a direct transfer of cash or
other property.

          5. REDEMPTION OF NEW TRACKING STOCK.

          (a) The corporation shall have the right to redeem all (but not less
than all) outstanding shares of New Tracking Stock if (i) there has occurred a
Tax Event prior to the Spin-off in which the adverse tax consequences with
respect to the Wireless Group Common Stock giving rise to such Tax Event also
give rise to a New Tracking Stock Tax Event and (ii) the corporation previously
or simultaneously redeems all outstanding shares of Wireless Group Common Stock
in accordance with the terms of the Certificate. In such event, the redemption
price per share of New Tracking Stock payable by the corporation upon such
redemption shall be equal to the sum of (w) $11,750, (x) interest on $11,750 at
a rate equal to the applicable Cost of Carry from the date of initial issuance
of such share of New Tracking Stock to but not including the Redemption Date,
(y) additional interest on $11,750 at a rate of 3% per annum from the date of
initial issuance of such share of New Tracking Stock to but not including the
Redemption Date and (z) all declared but unpaid dividends thereon from the date
of initial issuance of such share of New Tracking Stock to but not including the
Redemption Date.

          (b) The corporation shall have the right to redeem all (but not less
than all) outstanding shares of New Tracking Stock if (i) the corporation has
failed to effect the Spin-off on or prior to April 26, 2002, (ii) the
corporation delivers an officer's certificate to the holders of the New Tracking
Stock to the effect that the Board of Directors has determined to abandon the
Spin-off and the corporation has no intention at the time of such redemption of
the New Tracking Stock to sell or otherwise dispose of the Wireless Group and
(iii) the corporation concurrently redeems all outstanding shares of the
Wireless Group Common Stock. In such event, the redemption price per share of
New Tracking Stock payable by the corporation upon such redemption shall be
equal to the sum of (w) $11,750, (x) interest on $11,750 at a rate equal to the
applicable Cost of Carry from the date of initial issuance of such share of New
Tracking Stock to but not including the Redemption Date, (y) additional interest
on $11,750 at a rate of 3% per annum from the date of initial issuance of such
share of New Tracking Stock to but not including the Redemption Date and (z) all
declared but unpaid dividends thereon from the

                                      -8-
<PAGE>

date of initial issuance of such share of New Tracking Stock to but not
including the Redemption Date.

          (c) At such time or times as the corporation exercises its right to
cause a redemption pursuant to this paragraph 5, the corporation shall give
notice of such redemption to all holders of New Tracking Stock by mailing by
first-class mail a notice of such redemption (a "Redemption Notice"), not less
than thirty (30) nor more than sixty (60) days prior to the date fixed for such
redemption (the "Redemption Date"), to their last addresses as they appear upon
the corporation's books and by simultaneously faxing such notice to such holders
to the fax numbers for such holders as they appear upon the corporation's
records. Each such Redemption Notice shall specify the Redemption Date and the
per share redemption price applicable to such redemption, and shall state that
the redemption price shall be paid upon surrender of the certificates
representing such shares of New Tracking Stock.

          (d) Before any holder of shares of New Tracking Stock shall be
entitled to receive the redemption price with respect to its shares of New
Tracking Stock, such holder must surrender, at such office as the corporation
shall specify, the certificates for such shares of New Tracking Stock duly
endorsed to the corporation or in blank or accompanied by proper instruments of
transfer to the corporation or in blank, unless the corporation shall waive such
requirement. The corporation shall, as soon as practicable after such surrender
of certificates representing such shares of New Tracking Stock, pay to the
holder for whose account such shares of New Tracking Stock were so surrendered,
or to such holder's nominee or nominees, the redemption price specified by
paragraph 5(a) or paragraph 5(b), as applicable.

          (e) No adjustments in respect of dividends shall be made upon the
redemption of any shares of New Tracking Stock; provided, however, that, if the
Redemption Date with respect to New Tracking Stock shall be subsequent to the
record date for the payment of a dividend or other distribution thereon or with
respect thereto but prior to the payment or distribution thereof, the registered
holders of such shares at the close of business on such record date shall be
entitled to receive the dividend or other distribution payable on such shares on
the date set for payment of such dividend or other distribution, notwithstanding
the redemption of such shares or the corporation's default in payment of the
dividend or distribution due on such date.

          (f) From and after any Redemption Date, all rights of a holder of
shares of New Tracking Stock shall cease except for the right, upon surrender of
the certificates representing such shares of New Tracking Stock, to receive the
redemption price with respect thereto.

                                      -9-
<PAGE>

          (g) If any redemption price to be paid pursuant to this paragraph 5 is
to be paid to a Person other than that in which the certificate representing
shares of New Tracking Stock are surrendered in exchange therefor is registered,
it shall be a condition to the making of such payment that the Person requesting
such payment pays any transfer or other taxes required by reason of the payment
for such shares being made to a person other than the record holder of the
certificate surrendered, or establishes, to the satisfaction of the corporation
or its agent, that such tax has been paid or is not applicable.

          6. LIQUIDATION.

          (a) In the event of any involuntary liquidation, winding-up or
dissolution of the corporation (an "Involuntary Liquidation"), after payment or
provision for payment of the debts and other liabilities of the corporation and
subject to the prior payment in full of the preferential amounts to which any
class or series of Liquidation Senior Securities is entitled, the holders of
shares of New Tracking Stock shall be entitled to receive for each share of New
Tracking Stock, before any payment or distribution of the assets of the
corporation (whether capital or surplus) shall be made to or set apart for the
holders of Liquidation Junior Securities, an aggregate amount in cash equal to
$3.65 billion. Such amount shall be distributed ratably among the shares of New
Tracking Stock outstanding immediately prior to such Involuntary Liquidation.
If, upon any such Involuntary Liquidation, the assets of the corporation, or
proceeds thereof, shall be insufficient to pay in full the amount set forth in
the preceding sentence and all other preferential liquidation payments with
respect to Liquidation Parity Securities, then such assets, or proceeds thereof,
shall be distributed among the shares of New Tracking Stock and all such other
Liquidation Parity Securities ratably in accordance with the respective amounts
that would be payable on such shares of New Tracking Stock and any such other
Liquidation Parity Securities if all amounts payable thereon were paid in full.
After the payment set forth in the first sentence of this paragraph 6(a) shall
have been made in full to the holders of the New Tracking Stock, and subject to
the prior payment in full of the preferential amounts to which any class or
series of Preferred Stock is entitled, the remaining assets of the corporation
available for distribution shall be distributed among the holders of the New
Tracking Stock and the holders of the Common Stock, the holders of the Class A
Liberty Media Group Common Stock, the holders of the Class B Liberty Media Group
Common Stock and the holders of the Wireless Group Common Stock, with each
holder of New Tracking Stock deemed to hold and to have converted such holder's
shares of New Tracking Stock into that number of shares of Wireless Group Common
Stock into which the number of shares of New Tracking Stock held by such holder
as of the date of the Involuntary Liquidation was convertible for all intents
and purposes as if such shares had been converted to Wireless Group Common Stock
as of the date of such Involuntary Liquidation, in each case in accordance with
the liquidation provisions set forth in Article Third, Part C, paragraph 6 of
the Certificate, it being

                                      -10-
<PAGE>

understood that in such event the Market Capitalization of the Wireless Group
Common Stock shall be determined by including in the number of outstanding
shares of Wireless Group Common Stock such shares deemed issued with respect to
such conversion; provided that any amounts payable with respect to a share of
New Tracking Stock pursuant to this sentence shall be reduced by the amount paid
with respect to such share in the first sentence of this paragraph 6(a).
          (b) In the event of any liquidation, winding-up or dissolution of the
corporation other than an Involuntary Liquidation as provided in paragraph 6(a),
effective as of immediately prior to the time of such liquidation, winding-up or
dissolution, without any action on the part of the corporation or any holder of
New Tracking Stock, each share of New Tracking Stock shall be automatically
converted into a number of shares of Wireless Group Common Stock at the then
applicable Conversion Rate, and the certificates representing shares of New
Tracking Stock held by such holder immediately prior to such conversion shall
thereafter, without any surrender of such certificates, represent shares of
Wireless Group Common Stock. After payment or provision for payment of the debts
and liabilities of the corporation and subject to the prior payment in full of
the preferential amounts to which any class or series of Preferred Stock is
entitled, the assets of the corporation available for distribution shall be
distributed among the holders of the Common Stock, the holders of the Class A
Liberty Media Group Common Stock, the holders of the Class B Liberty Media Group
Common Stock and the holders of the Wireless Group Common Stock (including the
Wireless Group Common Stock issued on conversion of the New Tracking Stock as
provided in the immediately preceding sentence), with each holder of New
Tracking Stock (as of immediately prior to such liquidation, winding-up or
dissolution) receiving in the distribution the amount to which such holder is
entitled by virtue of such holder's ownership of shares of Wireless Group Common
Stock into which such New Tracking Stock was converted as contemplated by the
immediately preceding sentence, in each case in accordance with the liquidation
provisions set forth in Article Third, Part C, paragraph 6 of the Certificate.

          (c) Neither the consolidation or merger of the corporation with or
into any other corporation or corporations nor the sale, transfer or lease of
all or substantially all the assets of the corporation itself shall be deemed to
be a voluntary or involuntary liquidation, dissolution or winding-up of the
corporation within the meaning of this paragraph 6. Any transaction or series of
related transactions that results in all of the assets and liabilities included
in the Wireless Group being held by one or more Wireless Group Subsidiaries, and
the distribution of some or all of the shares of such Wireless Group
Subsidiaries (and no other material assets or liabilities) to the holders of the
outstanding Wireless Group Common Stock shall not constitute a voluntary or
involuntary liquidation, dissolution or winding up of the corporation for
purposes of this Amendment but shall be subject to paragraph 4 of Part C of
Article Third of the Certificate and, in the case of the Spin-off, to paragraph
8 of this Amendment. Any

                                      -11-
<PAGE>

transaction or series of related transactions that results in all of the assets
and liabilities included in the Liberty Media Group being held by one or more
Liberty Media Group Subsidiaries (as defined in paragraph 5(a) of Part B of
Article Third of the Certificate), and the distribution of such Liberty Media
Group Subsidiaries (and no other material assets or liabilities) to the holders
of the outstanding Liberty Media Group Common Stock shall not constitute a
voluntary or involuntary liquidation, dissolution or winding up of the
corporation for purposes of this Amendment, but shall be subject to paragraph
5(a) of Part B of Article Third of the Certificate.

          7. CONVERSION.

          (a) Prior to the Spin-off, and subject to the provisions of this
paragraph 7, the New Tracking Stock shall be convertible at the election of the
holders thereof, at any time into fully paid and non-assessable shares of
Wireless Group Common Stock; provided that such conversion is in respect to all
(and not less than all) shares of New Tracking Stock. In the event of such
conversion, each outstanding share of New Tracking Stock shall be convertible
into five hundred (500) shares of Wireless Group Common Stock (the "Conversion
Rate") as of the date of the conversion subject to adjustment from time to time
pursuant to paragraph 7(e).

          (b) (i) In order to exercise the conversion privilege, all holder(s)
of the shares of New Tracking Stock to be converted shall surrender the
certificate(s) representing such shares at the principal executive offices of
the corporation, with a written notice of election to convert completed and
signed. Unless the shares issuable on conversion are to be issued in the same
name as the name in which such shares of New Tracking Stock are registered, each
share surrendered for conversion shall be accompanied by instruments of
transfer, in form satisfactory to the corporation, duly executed by the holder
or the holder's duly authorized attorney, and an amount sufficient to pay any
transfer or similar tax.

          (ii) As promptly as practicable after the surrender by the holder(s)
of all certificates for shares of New Preferred Stock as aforesaid, the
corporation shall issue and shall deliver to such holder(s), or on the holder's
or holders' written order to the holder's or holders' transferee(s), a
certificate or certificates for the whole number of shares of Wireless Group
Common Stock issuable upon the conversion of such shares in accordance with the
provisions of this paragraph 7.

          (iii) Each conversion of shares of New Tracking Stock pursuant to this
paragraph 7 shall be deemed to have been effected immediately prior to the close
of business on the date on which the certificates for shares of New Tracking
Stock shall have been surrendered and such notice received by the corporation as
aforesaid, and the

                                      -12-
<PAGE>

person in whose name or names any certificate or certificates for shares of
Wireless Group Common Stock shall be issuable upon such conversion shall be
deemed to have become the holder of record of the shares of Wireless Group
Common Stock represented thereby at such time on such date and such conversion
shall be into a number of shares of Wireless Group Common Stock in respect of
the shares of New Tracking Stock being converted as determined in accordance
with this paragraph 7 at such time on such date. All shares of Wireless Group
Common Stock delivered upon conversion of the New Tracking Stock will upon
delivery be duly and validly issued and fully paid and non-assessable, free of
all liens and charges created by acts or omissions of the corporation and not
subject to any preemptive rights. Upon the surrender of certificates
representing the shares of New Tracking Stock to be converted, the shares to be
so converted shall no longer be deemed to be outstanding and all rights of a
holder with respect to such shares surrendered for conversion shall immediately
terminate except the right to receive the Wireless Group Common Stock and other
amounts payable pursuant to this paragraph 7.

          (c) (i) The corporation covenants, notwithstanding any prior
redemption or exchange of all outstanding shares of Wireless Group Common Stock,
(y) that for so long as any shares of New Tracking Stock are outstanding or
issuable upon conversion or exchange of other securities outstanding, it will at
all times reserve and keep available, free from preemptive rights, such number
of its authorized but unissued shares of Wireless Group Common Stock as shall be
required for the purpose of effecting conversions of the New Tracking Stock and
(z) that for so long as any shares of New Tracking Stock are outstanding or
issuable upon conversion or exchange of other securities outstanding, the
provisions of Article Third, Part C governing the terms of Wireless Group Common
Stock shall remain fully operable and in effect.

          (ii) Prior to the delivery of any securities which the corporation
shall be obligated to deliver upon conversion of the New Tracking Stock, the
corporation shall comply with all applicable federal and state laws and
regulations which require action to be taken by the corporation.

          (d) The corporation will pay any and all documentary stamp or similar
issue or transfer taxes payable in respect of the issue or delivery of shares of
Wireless Group Common Stock on conversion of the New Tracking Stock pursuant
hereto; provided that the corporation shall not be required to pay any tax which
may be payable in respect of any transfer involved in the issue or delivery of
shares of Wireless Group Common Stock in a name other than that of the holder of
the New Tracking Stock to be converted and no such issue or delivery shall be
made unless and until the person requesting such issue or delivery has paid to
the corporation the amount of any such tax or has established, to the
satisfaction of the corporation, that such tax has been paid.

                                      -13-
<PAGE>

          (e) (i) In case the corporation shall at any time after the date of
initial issuance of the New Tracking Stock (A) declare a dividend or make a
distribution on Wireless Group Common Stock payable in Wireless Group Common
Stock, (B) subdivide or split the outstanding Wireless Group Common Stock, (C)
combine or reclassify the outstanding Wireless Group Common Stock into a smaller
number of shares, (D) issue any shares of its capital stock in a
reclassification of Wireless Group Common Stock (including any such
reclassification in connection with a consolidation or merger in which the
corporation is the continuing corporation), or (E) consolidate with, or merge
with or into, any other person, the Conversion Rate in effect at the time of the
record date for such dividend or distribution or on the effective date of such
subdivision, split, combination, consolidation, merger or reclassification shall
be adjusted so that the conversion of the New Tracking Stock after such time
shall entitle the holder to receive the aggregate number of shares of Wireless
Group Common Stock or other securities of the corporation (or other securities
into which such shares of Wireless Group Common Stock have been converted,
exchanged, combined, consolidated, merged or reclassified pursuant to clause
7(e)(i)(C), 7(e)(i)(D) or 7(e)(i)(E) above) which, if the New Tracking Stock had
been converted immediately prior to such time, such holder would have owned upon
such conversion and been entitled to receive by virtue of such dividend,
distribution, subdivision, split, combination, consolidation, merger or
reclassification. Such adjustment shall be made successively whenever an event
listed above shall occur.

          (ii) In the event that, at any time as a result of the provisions of
this paragraph 7(e), a holder of New Tracking Stock upon subsequent conversion
shall become entitled to receive any shares of capital stock of the corporation
other than Wireless Group Common Stock, the number of such other shares so
receivable upon conversion of New Tracking Stock shall thereafter be subject to
adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions contained in this Amendment.

          (g) All adjustments pursuant to this paragraph 7 shall be notified to
the holders of the New Tracking Stock and such notice shall be accompanied by a
schedule of computations of the adjustments; such notice shall be simultaneously
faxed to such holders to the fax numbers for such holders as they appear upon
the corporation's records.

          8. EXCHANGE IN CONNECTION WITH SPIN-OFF.

          (a) If any holder of New Tracking Stock shall not have converted such
holder's shares of New Tracking Stock into shares of Wireless Group Common Stock
prior to the record date set by the Board of Directors for the Spin-off,
effective as of immediately prior to the effective time of the Spin-off, without
any action on the part of

                                      -14-
<PAGE>

the corporation, AT&T Wireless or such holder, each share of such holder's New
Tracking Stock shall be automatically converted (and to have been converted as
of such record date) into a number of shares of Wireless Group Common Stock at
the Conversion Rate and each such share of Wireless Group Common Stock into
which the New Tracking Stock has been converted shall be exchanged at the
effective time of the Spin-off for the number of shares of AT&T Wireless Common
Stock issuable with respect to one share of Wireless Group Common Stock pursuant
to the Spin-off. For the avoidance of doubt, the Spin-off shall be effected by
the corporation as a Board Required Exchange (as defined in the Certificate)
pursuant to Article Third, Part C, paragraphs 4 and 5 of the Certificate and, in
that regard, the shares of AT&T Wireless Common Stock to be issued upon
consummation of the Spin-off shall be deemed "Exchange Shares" thereunder.

          (b) No adjustments in respect of dividends shall be made upon the
exchange of any shares of New Tracking Stock; provided, however, that, if the
date of consummation of the Spin-off shall be subsequent to the record date for
the payment of a dividend or other distribution on the New Tracking Stock or
with respect thereto but prior to the payment or distribution thereof, the
registered holders of such shares of New Tracking Stock at the close of business
on such record date shall be entitled to receive the dividend or other
distribution payable on such shares on the date set for payment of such dividend
or other distribution, notwithstanding the conversion and exchange of such
shares or the corporation's default in payment of the dividend or distribution
due on such date.

          (c) The corporation shall give notice of the Spin-off to all holders
of New Tracking Stock, by mailing by first-class mail a notice of such exchange
(an "Exchange Notice"), not less than thirty (30) nor more than sixty (60) days
prior to the date fixed for such exchange (the "Exchange Date") to their last
addresses as they appear upon the corporation's books and by simultaneously
faxing such notice to such holders to the fax numbers for such holders as they
appear upon the corporation's records. Each such Exchange Notice shall specify
the Exchange Date and the Exchange Rate (as defined in the Certificate)
applicable to such exchange, and shall state that issuance of certificates
representing AT&T Wireless Common Stock to be received upon conversion and
exchange of shares of New Tracking Stock shall be upon surrender of certificates
representing such shares of New Tracking Stock.

          (d) Before any holder of shares of New Tracking Stock shall be
entitled to receive certificates representing such shares of AT&T Wireless
Common Stock, such holder must surrender, at such office as the corporation
shall specify, certificates for such shares of New Tracking Stock duly endorsed
to the corporation or in blank or accompanied by proper instruments of transfer
to the corporation or in blank, unless the corporation shall waive such
requirement; no certificates representing the

                                      -15-
<PAGE>

shares of Wireless Group Common Stock into which the New Tracking Stock is
converted immediately prior to the exchange for shares of AT&T Wireless Common
Stock shall be issued and, accordingly, no surrender of such certificates shall
be required in connection with the exchange for shares of AT&T Wireless Common
Stock upon consummation of the Spin-off. The corporation shall, as soon as
practicable after such surrender of certificates representing such shares of New
Tracking Stock, issue and deliver, at the office of the transfer agent
representing shares of AT&T Wireless Common Stock, to the holder for whose
account such shares of New Tracking Stock were so surrendered, or to such
holder's nominee or nominees, certificates representing the number of shares of
AT&T Wireless Common Stock to which such holder shall be entitled.

          (e) From and after the consummation of the Spin-off, all rights of a
holder of shares of New Tracking Stock immediately prior to the conversion and
exchange contemplated by this paragraph 8 shall cease except for the right, upon
surrender of the certificates representing such shares of New Tracking Stock, to
receive certificates representing shares of AT&T Wireless Common Stock and
together with the rights to dividends as described in paragraph 8(c). No holder
of a certificate that immediately prior to the consummation of the Spin-off
represented shares of New Tracking Stock shall be entitled to receive any
dividend or other distribution with respect to shares of AT&T Wireless Common
Stock until surrender of such holder's certificate for a certificate or
certificates representing shares of AT&T Wireless Common Stock. Upon surrender,
the holder shall receive the amount of any dividends or other distributions
(without interest) that were payable with respect to a record date after the
date of consummation of the Spin-off, but that were not paid by reason of the
foregoing with respect to the number of shares of AT&T Wireless Common Stock
represented by the certificate or certificates issued upon such surrender. From
and after the date of consummation of the Spin-off, the corporation shall,
however, be entitled to treat certificates for New Tracking Stock that have not
yet been surrendered for conversion and exchange as evidencing the ownership of
the number of shares of AT&T Wireless Common Stock for which the shares of New
Tracking Stock represented by such certificates have been converted and
exchanged pursuant to this paragraph 8, notwithstanding the failure to surrender
such certificates.

          (f) If any certificate for shares of AT&T Wireless Common Stock is to
be issued in a name other than that in which the certificate representing shares
of New Tracking Stock surrendered in exchange therefor is registered, it shall
be a condition of such issuance that the person requesting the issuance pays any
transfer or other taxes required by reason of the issuance of certificates for
such shares of AT&T Wireless Common Stock in a name other than that of the
record holder of the certificate surrendered, or establishes, to the
satisfaction of the corporation or its agent, that such tax

                                      -16-
<PAGE>

has been paid or is not applicable. Under no circumstances shall the corporation
be liable to a holder of shares of New Tracking Stock for any shares of AT&T
Wireless Common Stock or dividends or distributions thereon delivered to a
public official pursuant to any applicable abandoned property, escheat or
similar law.

          (g) In the event the Spin-off is to be effected by spinning off an
entity other than AT&T Wireless, all references in this Amendment to AT&T
Wireless shall be deemed to refer to such other entity and all references in
this Amendment to AT&T Wireless Common Stock shall be deemed to refer to the
publicly traded common stock of such other entity outstanding as of and
following the Spin-off. For purposes of this paragraph 8, any spin-off meeting
the definition of Spin-off as set forth in paragraph 1 shall be deemed to be the
Spin-off, regardless of when such spin-off is consummated.

                                      -17-
<PAGE>

                                       IV.

          The amendments of the Certificate of Incorporation effected by this
Certificate were authorized by action of the Board of Directors of the
corporation pursuant to Section 502 of the Business Corporation Law.

                                      -18-
<PAGE>

          IN WITNESS WHEREOF, we have made and subscribed this Certificate this
__ day of ______, ___.

                                     By:  _________________________
                                          Name:
                                          Title:

                                     By:  _________________________
                                          Name:
                                          Title:

[Corporate Seal]

                                      -19-Exhibit 10.2
                                                                    ------------

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

                               INVESTOR AGREEMENT

                                  BY AND AMONG

                                   AT&T CORP.,

                          AT&T WIRELESS SERVICES, INC.

                                       AND

                                NTT DOCOMO, INC.

                          DATED AS OF DECEMBER 20, 2000

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

<PAGE>

                                TABLE OF CONTENTS

                                                                            PAGE

                                    ARTICLE I

                                   DEFINITIONS

Section 1.1       Definitions..................................................1

                                   ARTICLE II

                         REPRESENTATIONS AND WARRANTIES

Section 2.1       Representations and Warranties of AT&T......................10
Section 2.2       Representations and Warranties of AT&T Wireless.............10
Section 2.3       Representations and Warranties of DoCoMo and each Designee..11

                                   ARTICLE III

                      GOVERNANCE AND STANDSTILL PROVISIONS

Section 3.1       Board of Directors..........................................11
Section 3.2       Pre-Spin-off Governance Rights..............................14
Section 3.3       Post-Spin-off Governance Rights.............................16
Section 3.4       Senior Leadership Team......................................17
Section 3.5       Management Positions........................................17
Section 3.6       Standstill Restrictions.....................................18
Section 3.7       Termination of the Standstill Restrictions..................22
Section 3.8       Voting......................................................24

                                   ARTICLE IV

                                 OTHER COVENANTS

Section 4.1       Technology Commitment.......................................25
Section 4.2       Joint Research and Development Effort.......................25
Section 4.3       Technology Default Right....................................25
Section 4.4       No Spin-off Repurchase Right................................29
Section 4.5       Reinvestment Right..........................................30
Section 4.6       Financial Statement Cooperation.............................32

                                    ARTICLE V

                           MOBILE MULTIMEDIA ALLIANCE

Section 5.1       The Mobile Multimedia Alliance and the MMS..................33
Section 5.2       Technology Evolution and Timing.............................33
Section 5.3       Contributions and Resources.................................34
Section 5.4       Advisory Committee and Senior Management....................36
Section 5.5       Business Plan...............................................36
Section 5.6       Termination.................................................37

                                       -i-
<PAGE>
                                                                            PAGE

Section 5.7       Other Operational Cooperation...............................37

                                   ARTICLE VI

                              TRANSFER RESTRICTIONS

Section 6.1       Transfer Restrictions.......................................38

                                   ARTICLE VII

                               REGISTRATION RIGHTS

Section 7.1       Demand Registrations........................................40
Section 7.2       Piggy-Back Registration.....................................42
Section 7.3       Limitations on Demand Registrations; Termination
                    of Registration Obligation................................43
Section 7.4       Registration Procedures.....................................44
Section 7.5       Registration Expenses.......................................49
Section 7.6       Indemnification; Contribution...............................49

                                  ARTICLE VIII

                                PREEMPTIVE RIGHTS

Section 8.1       Preemptive Rights...........................................52
Section 8.2       Limitation of Preemptive Rights.............................55

                                   ARTICLE IX

                          EFFECTIVENESS AND TERMINATION

Section 9.1       Effectiveness...............................................55
Section 9.2       Termination.................................................55
Section 9.3       Partial Termination.........................................55

                                    ARTICLE X

                        NON-COMPETITION; CONFIDENTIALITY

Section 10.1      Non-Competition Restrictions................................55
Section 10.2      Definitions.................................................56
Section 10.3      Duration of and Limitations on Restrictions.................57
Section 10.4      Non-Disclosure Commitment...................................58

                                   ARTICLE XI

                                  MISCELLANEOUS

Section 11.1      Injunctive Relief...........................................60
Section 11.2      Successors and Assigns......................................60
Section 11.3      Amendments; Waiver..........................................60
Section 11.4      Notices.....................................................60
Section 11.5      Governing Law...............................................62

                                      -ii-
<PAGE>

                                                                            PAGE

Section 11.6      Arbitration.................................................62
Section 11.7      Headings....................................................64
Section 11.8      Entire Agreement............................................64
Section 11.9      Severability................................................64
Section 11.10     Submission to Jurisdiction; Waivers.........................64
Section 11.11     Waiver of Immunity..........................................65
Section 11.12     Waiver of Jury Trial........................................65
Section 11.13     Counterparts................................................65
Section 11.14     Interpretation..............................................65
Section 11.15     Anti-Dilution Adjustments...................................65
Section 11.16     Effectiveness of this Agreement.............................65
Section 11.17     No Third Party Beneficiaries................................66
Section 11.18     Substitution for AT&T Wireless..............................66

Exhibit A ..............................Cost of Carry
Exhibit B ..............................List of Separation Agreements
Schedule 3.4 ...........................Senior Leadership Team
Schedule 4.1 ...........................Top 50 U.S. BTAs
Schedule 5.3(b) ........................Mobile Multimedia Support/Contribution

                                     -iii-
<PAGE>

          INVESTOR AGREEMENT (this "AGREEMENT"), by and among AT&T Corp., a New
York corporation ("AT&T"), AT&T Wireless Services, Inc., a Delaware corporation
and a wholly-owned subsidiary of AT&T ("AT&T WIRELESS"), and NTT DoCoMo, Inc., a
company incorporated under the laws of Japan ("DOCOMO"), dated as of December
20, 2000, but effective and binding upon the parties only as specified in
Section 11.16.

                              W I T N E S S E T H:

          WHEREAS, AT&T, AT&T Wireless and DoCoMo have entered into a Letter
Agreement, dated November 30, 2000 (including the Term Sheet and other schedules
and attachments thereto, the "LETTER AGREEMENT"), that sets forth the agreements
among the parties for an investment by DoCoMo in the Wireless Group and, after
the Spin-off, in AT&T Wireless, and a related mobile multimedia alliance;

          WHEREAS, AT&T, AT&T Wireless and DoCoMo are entering into a Securities
Purchase Agreement, dated as of the date hereof (as it may be amended from time
to time, the "PURCHASE AGREEMENT"), pursuant to which, among other things,
DoCoMo will purchase 812,511.778 shares of New Tracking Stock (as defined in the
Purchase Agreement) and Warrants to purchase an additional 83,496.546 shares of
New Tracking Stock, which will be converted, in connection with the Spin-off,
into shares of Current Wireless Tracking Stock, which shares of Current Wireless
Tracking Stock will then immediately be exchanged for shares of AT&T Wireless
Common Stock, and Warrants to purchase shares of AT&T Wireless Common Stock
(collectively, the "INVESTMENT");

          WHEREAS, the Letter Agreement contemplates that the agreements
contained therein would be superseded by definitive agreements, including (1)
the Purchase Agreement, (2) a Warrant Agreement and (3) this Agreement; and

          WHEREAS, AT&T, AT&T Wireless and DoCoMo desire to establish in this
Agreement certain terms and conditions concerning the Investment and the
Alliance, and related provisions concerning DoCoMo's relationship with AT&T and
AT&T Wireless following the Closing.

          NOW, THEREFORE, in consideration of the mutual covenants and
agreements set forth herein and for other good and valuable consideration,
receipt and sufficiency of which is hereby acknowledged, the parties hereto
hereby agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

          Section 1.1 DEFINITIONS. In addition to other terms defined elsewhere
in this Agreement, as used in this Agreement, the following terms
shall have the meanings ascribed to them below:

          "ACQUIRED SPINCO SHARES" shall have the meaning assigned in Section
4.5.

<PAGE>

          "ACQUIRED SPINCO WARRANTS" shall have the meaning assigned in Section
4.5.

          "ADDITIONAL SECURITIES" shall have the meaning assigned in Section
8.1(a).

          "ADVISORY COMMITTEE" shall have the meaning assigned in Section
5.4(b).

          "AFFILIATE" shall mean a Person that directly, or indirectly through
one or more intermediaries, controls, or is controlled by, or is under common
control with, a specified Person; PROVIDED, HOWEVER, that for so long as At Home
Corporation, a Delaware corporation or Liberty Media Corporation, a Delaware
corporation, and each other corporation constituting part of the Liberty Media
Group as defined in AT&T's certificate of incorporation, and their successors
and assigns ("AT HOME" and "LIBERTY Media," respectively) has any public
stockholders (directly, or through a tracking stock or similar concept), At Home
or Liberty Media, as the case may be, and any Affiliates or Subsidiaries of
Liberty Media, At Home or any of their respective Subsidiaries shall not be
treated as or deemed to be Affiliates of AT&T or of any of AT&T's Subsidiaries
or Affiliates for purposes hereof. For the purposes of this definition,
"CONTROL," (including, with correlative meanings, the terms "controlling",
"controlled by" and "under common control with"), as applied to any Person,
means the possession, directly or indirectly, of the power to direct or cause
the direction of the management and policies of that Person, whether through the
ownership of voting securities or by contract or otherwise.

          "AGREEMENT" shall have the meaning assigned in the preamble hereto.

          "ALLIANCE" shall have the meaning assigned in Section 5.1(a).

          "ALLIANCE PARTNERS" shall have the meaning assigned in Section 5.1(a).

          "ARBITRATION CLAIMS" shall have the meaning assigned in Section 11.6.

          "AT&T" shall have the meaning assigned in the preamble hereto.

          "AT&T WIRELESS" shall have the meaning assigned in the preamble
hereto.

          "AT&T WIRELESS COMMON STOCK" shall mean the shares of common stock,
par value $.01 per share, of AT&T Wireless as of and following the Spin-off.

          "AT&T WIRELESS STOCK" shall mean, collectively, New Tracking Stock,
Current Wireless Tracking Stock, AT&T Wireless Common Stock and Warrants.

          "BENEFICIALLY OWN" shall mean, with respect to any securities, having
"beneficial ownership" of such securities for purposes of Rule 13d-3 or 13d-5
under the Exchange Act as in effect on the date hereof, and "BENEFICIAL
OWNERSHIP" shall have the corresponding meaning.

          "BLACKOUT PERIOD" shall have the meaning assigned in Section 7.1(b).

          "BOARD" shall mean at any time the Board of Directors of AT&T (if the
Spin-off has not been consummated at such time) or AT&T Wireless (if the
Spin-off has been consummated at such time).

                                      -2-
<PAGE>

          "BUSINESS DAY" shall mean any day other than a Saturday, Sunday or a
legal holiday in New York City or Tokyo, Japan, or any other day on which
commercial banks in those locations are authorized or required by law or
government decree to close.

          "BUSINESS PLAN" shall have the meaning assigned in Section 5.5(a).

          "CERTIFICATE OF AMENDMENT" shall mean the Certificate of Amendment
creating the New Tracking Stock, in the form set forth as Exhibit A to the
Purchase Agreement.

          "CHTML" shall mean Compact HyperText Markup Languages.

          "CLAIMS" shall have the meaning assigned in Section 7.6(a).

          "CLOSING" shall have the meaning assigned in the Purchase Agreement.

          "CLOSING DATE" shall have the meaning assigned in the Purchase
Agreement.

          "COMPETES" shall have the meaning assigned in Section 10.2(a).

          "CONTROLLED SUBSIDIARY" shall mean (a) with respect to DoCoMo each of
(i) each Subsidiary of DoCoMo and (ii) each other other Person in which DoCoMo
has a direct or indirect investment or other economic interest and to which
DoCoMo, or any of DoCoMo's Subsidiaries, has disclosed any material non-public
information concerning AT&T, AT&T Wireless, the MMS or the Investment and (b)
with respect to either of AT&T or AT&T Wireless, its Subsidiaries.

          "COST OF CARRY" shall mean an interest rate per annum determined in
accordance with Exhibit A hereto.

          "CURRENT MARKET PRICE" on any date in question means the average of
the daily Market Values for the relevant security for the five consecutive
trading days ending on the day before the date in question.

          "CURRENT WIRELESS TRACKING STOCK" shall mean Wireless Group Common
Stock, par value $1.00 per share, of AT&T.

          "DEMAND REGISTRATION" shall have the meaning assigned in Section
7.1(a).

          "DEMAND REQUEST" shall have the meaning assigned in Section 7.1(a).

          "DEMAND SHARES" shall have the meaning assigned in Section 7.1(a).

          "DESIGNEE" shall have the meaning assigned in Section 6.1(a). Each
Person that is a Designee at any relevant time shall be deemed to be a party to
this Agreement for all purposes hereof.

          "DIRECTOR" shall mean any member of the Board.

                                      -3-
<PAGE>

          "DOCOMO" shall have the meaning assigned in the preamble hereto. For
purposes of any provision hereof relating to the ownership of AT&T Wireless
Stock and the rights and obligations attendant thereto, the term "DoCoMo" shall
also include any Person that is a Designee at the relevant time, became such in
accordance with Section 6.1(a) hereof, and has executed and is a party to this
Agreement.

          "DOCOMO AT&T NOMINEE" shall have the meaning assigned in Section
3.1(a).

          "DOCOMO AT&T WIRELESS NOMINEES" shall have the meaning assigned in
Section 3.1(b).

          "ECONOMIC INTEREST PERCENTAGE" of DoCoMo in AT&T Wireless shall mean,
calculated at any particular point in time, the ratio, expressed as a
percentage, of (a) prior to consummation of the Spin-off, (x) the number of
shares of Current Wireless Tracking Stock Beneficially Owned by DoCoMo at the
relevant time assuming conversion of any shares of New Tracking Stock (excluding
any shares Beneficially Owned by virtue of ownership of unexercised Warrants) to
(y) the denominator of the Wireless Group Allocation Fraction at the relevant
time, adjusted on a Fully Diluted Basis but without giving effect to any
unexercised Warrants; and (b) after consummation of the Spin-off, (x) the number
of shares of AT&T Wireless Common Stock Beneficially Owned by DoCoMo at the
relevant time (excluding any shares Beneficially Owned by virtue of ownership of
unexercised Warrants) to (y) the total number of shares of AT&T Wireless Common
Stock outstanding at the relevant time, on a Fully Diluted Basis but without
giving effect to any unexercised Warrants.

          "ECONOMIC INTERESTS" in AT&T Wireless or the Wireless Group shall mean
(a) at any time prior to consummation of the Spin-off, (i) AT&T's Retained
Wireless Interest and (ii) shares of Current Wireless Tracking Stock, including
securities of AT&T (including New Tracking Stock) that by their terms are
convertible into or exercisable or exchangeable for shares of Current Wireless
Tracking Stock, and (b) at any time following consummation of the Spin-off, (i)
shares of AT&T Wireless Common Stock, including securities of AT&T Wireless that
by their terms are convertible into or exercisable or exchangeable for shares of
AT&T Wireless Common Stock and (ii) shares of any class of preferred stock of
AT&T Wireless that by their terms are entitled to receive dividends or
participate in dividends together with the AT&T Wireless Common Stock.

          "EFFECTIVE PERIOD" shall have the meaning assigned in Section
7.4(a)(iii).

          "EQUITY SHARES" shall mean (a) at any time prior to consummation of
the Spin-off, shares of Current Wireless Tracking Stock, including securities
that by their terms are convertible into or exercisable or exchangeable for
shares of Current Wireless Tracking Stock, and any other equity securities of
AT&T that represent solely or primarily economic interests in the Wireless
Group, and (b) at any time following consummation of the Spin-off, (i) shares of
AT&T Wireless Common Stock, including securities that by their terms are
convertible into or exercisable or exchangeable for shares of AT&T Wireless
Common Stock and (ii) shares of any class of preferred stock of AT&T Wireless
that by their terms are entitled to receive dividends or participate in
dividends together with the AT&T Wireless Common Stock, including securities

                                      -4-
<PAGE>

that by their terms are convertible into or exercisable or exchangeable for any
such shares of preferred stock.

          "EXCESS SECURITIES" shall have the meaning assigned in Section 8.1(e).

          "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, or any
successor federal statute, and the rules and regulations promulgated thereunder,
all as amended, and as the same may be in effect from time to time.

          "EXCHANGE OFFER" shall have the meaning assigned in Section 3.2(a).

          "FULLY DILUTED BASIS" shall mean based on the total number of shares
of the relevant class of stock or type of equity interest that would be
outstanding on the relevant date assuming the exercise of all options, warrants
and other rights to acquire such relevant class of stock or type of equity
interest (without regard to exercisability, vesting or similar provisions and
restrictions thereof) and the conversion or exchange of all securities
convertible into or exchangeable for stock or equity interest (without regard to
exercisability, vesting or similar provisions and restrictions thereof);
PROVIDED that the number of such shares or interests that would be outstanding
assuming the exercise of then-outstanding options and warrants shall be computed
on the Treasury Method.

          "HDML" shall mean Handheld Device Markup Languages.

          "HTML" means HyperText Markup Language.

          "HOME TERRITORY" shall mean the nation of Japan for DoCoMo, and the
United States, Canada and Mexico for AT&T Wireless.

          "I-MODE MOBILE MULTIMEDIA" shall mean wireless internet access and
related mobile multimedia applications and services from wireless phones and
other wireless access devices based on DoCoMo's i-mode and multimedia expertise,
experience, know-how and technology.

          "INVESTMENT" shall have the meaning assigned in the recitals hereto.

          "INVESTOR RIGHTS TERMINATION EVENT" shall have the meaning assigned in
Section 3.1(d).

          "ISSUER" shall mean AT&T or AT&T Wireless, as the case may be, in its
capacity as issuer of Registrable Securities for purposes of Article VII or as
issuer of Additional Securities for purposes of Article VIII.

          "LETTER AGREEMENT" shall have the meaning assigned in the preamble
hereto.

          "MARKET VALUE" means, with respect to a particular security, on any
given day, the average of the highest and lowest reported sale prices regular
way or, in case no such reported sales take place on such day, the average of
the highest asked and lowest bid prices regular way, in either case on the
principal national securities exchange on which the applicable security is

                                      -5-
<PAGE>

listed or admitted to trading, or if not listed or admitted to trading on any
national securities exchange, (i) the average of the highest and lowest sale
prices for such day reported by the Nasdaq Stock Market if such security is
traded over-the-counter and quoted in the Nasdaq Stock Market, or (ii) if such
security is so traded, but not so quoted, the average of the highest reported
asked and lowest reported bid prices of such security as reported by the Nasdaq
Stock Market or any comparable system, or (iii) if such security is not listed
on the Nasdaq Stock Market or any comparable system, the average of the highest
asked and lowest bid prices as furnished by two members of the National
Association of Securities Dealers, Inc. selected from time to time by the Board
for that purpose.

          "MAXIMUM NUMBER" shall have the meaning assigned in Section 7.2(b).

          "MMS" shall have the meaning assigned in Section 5.1(c).

          "MMS CEO" shall have the meaning assigned in Section 5.4(a).

          "MOBILE MULTIMEDIA CONTRIBUTION" shall have the meaning assigned in
Section 10.2(b).

          "MOBILE TELECOMMUNICATIONS INFRASTRUCTURE" shall have the meaning
assigned in Section 10.2(d).

          "NEW TRACKING STOCK" shall mean shares of Wireless Group Preferred
Tracking Stock, par value $1.00 per share, of AT&T having the terms set forth in
the Certificate of Amendment.

          "NO SPIN-OFF REPURCHASE PRICE" shall have the meaning assigned in
Section 4.4(a).

          "NO SPIN-OFF RIGHT" shall have the meaning assigned in Section 4.4(a).

          "NOMINEE DISCLOSURE INFORMATION" shall have the meaning assigned in
Section 3.1(a).

          "NYSE" shall mean the New York Stock Exchange, Inc.

          "ORIGINAL INVESTMENT SHARES" means the shares of New Tracking Stock
acquired by DoCoMo pursuant to the Purchase Agreement and any shares of Current
Wireless Tracking Stock issued upon conversion thereof and any shares of AT&T
Wireless Common Stock issued in the Spin-off in exchange for or redemption of
such shares of Current Wireless Tracking Stock.

          "ORIGINAL PURCHASE PRICE" shall mean (a) $3,162.602 for each Warrant
to purchase one share of New Tracking Stock; (b) $6.3252 for each Warrant to
purchase one share of Current Tracking Stock or one share of AT&T Wireless
Common Stock; (c) $11,750.00 for each share of New Tracking Stock; and (d)
$23.50 for each share of Current Wireless Tracking Stock or AT&T Wireless Common
Stock.

          "OTHER HOLDER" shall have the meaning assigned in Section 7.2(b).

                                       -6-
<PAGE>

          "PERMITTED REDEMPTION" shall have the meaning assigned in Section 4.5.

          "PERSON" shall mean a legal person, including any individual,
corporation, company, partnership, joint venture, association, joint-stock
company, trust, limited liability company or unincorporated association or any
other entity or organization, including a government or any agency or political
subdivision thereof, or any other entity of whatever nature.

          "PIGGY-BACK REGISTRATION" shall have the meaning assigned in Section
7.2(a).

          "PIGGY-BACK REQUEST" shall have the meaning assigned in Section
7.2(a).

          "POST-REDEMPTION SALE" shall have the meaning assigned in Section 4.5.

          "POST-REDEMPTION SPIN-OFF" shall have the meaning assigned in Section
4.5.

          "PREEMPTIVE RIGHTS" shall have the meaning assigned in Section 8.1(a).

          "PROPRIETARY INFORMATION" shall have the meaning set forth in Section
10.4.

          "PURCHASE AGREEMENT" shall have the meaning assigned in the recitals
hereto.

          "REGISTRABLE SECURITIES" shall mean (i) any shares of Current Wireless
Tracking Stock issued upon conversion of any shares of New Tracking Stock that
were issued pursuant to the Purchase Agreement or this Agreement, or that were
issued upon exercise of any Warrants, (ii) any shares of AT&T Wireless Common
Stock into which any such shares of Current Wireless Tracking Stock shall have
been converted, (iii) any shares of AT&T Wireless Common Stock issued upon
exercise of any Warrants, and (iv) any AT&T Wireless Stock issued in respect of
any of the Registrable Securities referred to in clauses (i), (ii) or (iii)
hereof in connection with stock splits, reverse stock splits, stock dividends or
distributions, or any similar recapitalization, on or after the date hereof, in
each case that are Beneficially Owned by DoCoMo or that have been Transferred
without registration under the Securities Act but in accordance with the terms
of this Agreement to a transferee entitled to the benefit of registration rights
pursuant to Section 6.1(c) of this Agreement. As to any particular Registrable
Securities, such securities shall cease to be Registrable Securities when (i) a
registration statement with respect to the sale of such securities shall have
become effective under the Securities Act and such securities shall have been
disposed of by the selling shareholder in accordance with such registration
statement, (ii) such securities shall have been distributed pursuant to Rule 144
(or any successor provision) under the Securities Act or (iii) such securities
shall have ceased to be outstanding.

          "RELATED AGREEMENTS" shall mean the Purchase Agreement, the Warrant
Agreement, that certain letter agreement, dated as of November 30, 2000,
executed and delivered among DoCoMo, AT&T and AT&T Wireless concurrently with
the execution and delivery of the Letter Agreement, that certain roaming side
letter, dated the date hereof, executed and delivered among DoCoMo, AT&T and
AT&T Wireless (and any letters or schedules referred to therein) and the
Certificate of Amendment.

          "RELEASE CONDITIONS" shall have the meaning assigned in Section
10.2(e).

                                      -7-
<PAGE>

          "RESELLER" shall have the meaning assigned in Section 10.2(f).

          "RETAINED WIRELESS INTEREST" shall mean, prior to the Spin-off, the
portion of the direct or indirect interests in the Wireless Group that are not
reflected by the shares of Current Wireless Tracking Stock (or by securities of
AT&T that by their terms are convertible into or exercisable or exchangeable for
shares of Current Wireless Tracking Stock).

          "SEC" shall mean the United States Securities and Exchange Commission.

          "SECURITIES ACT" shall mean the Securities Act of 1933, and any
similar or successor federal statute, and the rules and regulations promulgated
thereunder, all as amended, and as the same may be in effect from time to time.

          "SEPARATION AGREEMENTS" shall mean the draft agreements or term sheets
relating to the Spin-off and the separation of the Wireless Group from AT&T and
the schedules related thereto other than those that collectively are not
material to AT&T Wireless or the Wireless Group, in each case in the respective
forms annexed to the Letter Agreement (and listed in Exhibit B hereto), in all
cases as amended or revised to the extent not prohibited by this Agreement.

          "SOLD BUSINESSES" shall have the meaning assigned in Section 4.5.

          "SPINCO" shall have the meaning assigned in Section 4.5.

          "SPINCO WARRANT NUMBER" shall have the meaning assigned in Section
4.5.

          "SPIN-OFF" shall mean the spin-off of AT&T Wireless in accordance with
the Separation Agreements. The Spin-off shall be deemed to have been consummated
following completion of the exchange of AT&T Wireless Common Stock for Current
Wireless Tracking Stock and the distribution of the remaining shares of AT&T
Wireless Common Stock to holders of common stock of AT&T. For all purposes of
this Agreement, the Spin-off shall not be a "transaction contemplated by this
Agreement."

          "STANDSTILL AFFILIATES" shall mean each of (i) DoCoMo, (ii) each
Controlled Subsidiary of DoCoMo and (iii) when acting on behalf of DoCoMo or any
of its Controlled Subsidiaries, any officer, director, employee or agent of
DoCoMo or any such Controlled Subsidiary of DoCoMo.

          "SUBSIDIARY" means, with respect to any Person, any other Person more
than fifty percent (50%) of the shares of the voting stock or other voting
interests of which are owned or controlled, or the ability to select or elect
more than fifty percent (50%) of the directors or similar managers is held,
directly or indirectly, by such first Person or one or more of its Subsidiaries
or by such first Person and one or more of its Subsidiaries; PROVIDED, HOWEVER,
that for so long as At Home or Liberty Media, as the case may be, has any public
stockholders (directly, or through a tracking stock or similar concept), At Home
and Liberty Media, as the case may be, and their respective Subsidiaries shall
not be treated as or deemed to be Subsidiaries of AT&T or of any of AT&T's
Subsidiaries or Affiliates for purposes hereof. A

                                      -8-
<PAGE>

Subsidiary that is directly or indirectly wholly owned by another Person except
for directors' qualifying shares shall be deemed wholly owned for the purposes
of this Agreement.

          "3G" shall mean third generation mobile communications systems that
are, or are based on technology that is, defined as IMT-2000 by the
International Telecommunications Union.

          "TECHNOLOGY DEFAULT EXERCISE NOTICE" shall have the meaning assigned
in Section 4.3(b).

          "TECHNOLOGY DEFAULT REPURCHASE PRICE" shall have the meaning assigned
in Section 4.3(c).

          "TECHNOLOGY DEFAULT RIGHT" shall have the meaning assigned in Section
4.3(a).

          "TOLLING PERIOD" shall have the meaning assigned in Section 3.1(d).

          "TRANSFER" shall mean any sale (including forward sale), transfer, or
other disposition to any Person, including pursuant to any redemption, the No
Spin-off Right or the Technology Default Right, and including Transfers
resulting from the exercise of any remedy by any Person to which the relevant
securities have been pledged.

          "TREASURY METHOD" shall mean treating options and warrants as they
would be treated under the "treasury stock method" of calculating diluted
earnings per share under Statement of Financial Accounting Standards No. 128 as
in effect as of the date hereof.

          "ULTIMATE PARENT" shall mean Nippon Telegraph and Telephone
Corporation ("NTT") or any Person (other than any government or political
subdivision or agency or instrumentality thereof) of which NTT is a Subsidiary
and that is not itself a Subsidiary of any other Person (other than any
government or political subdivision or agency or instrumentality thereof).

          "UNDERLYING STOCK" shall have the meaning set forth in the Warrant
Agreement.

          "WAP-NG" shall mean wireless access protocol - next generation.

          "WARRANT AGREEMENT" shall mean the Warrant Agreement with respect to
the issuance of the Warrants in the form attached to the Purchase Agreement as
Exhibit B.

          "WARRANT PERCENTAGE" shall have the meaning assigned in Section 4.5.

          "WARRANTS" shall have the meaning assigned in the Purchase Agreement.

          "W-CDMA" shall mean the CDMA-based radio access technology defined and
specified in the Third Generation Partnership Project for IMT-2000 systems,
specifications of which may be modified from time to time by the Third
Generation Partnership Project.

                                      -9-
<PAGE>

          "WIRELESS GROUP" has the meaning assigned to it in the Certificate of
Incorporation of AT&T, as amended.

          "WIRELESS GROUP ALLOCATION FRACTION" has the meaning assigned to such
term in the Certificate of Incorporation of AT&T, as amended, as in effect on
November 30, 2000.

          "WIRELESS OPERATOR" shall have the meaning assigned in Section 3.3(a).

          "WML" shall mean Wireless Markup Language.

          "XHTML" shall mean Extensible HyperText Markup Language.

                                   ARTICLE II

                         REPRESENTATIONS AND WARRANTIES

          Section 2.1 REPRESENTATIONS AND WARRANTIES OF AT&T. AT&T
represents and warrants to DoCoMo as of the date hereof as follows:

          (a) AT&T has been duly incorporated and is validly existing in good
     standing under the laws of the State of New York, and has all requisite
     power and authority to execute and deliver this Agreement and to perform
     its obligations hereunder and to consummate the transactions contemplated
     hereby.

          (b) This Agreement and all transactions contemplated hereby have been
     duly and validly authorized by all necessary action on the part of AT&T.

          (c) This Agreement has been duly executed and delivered by AT&T and,
     assuming due authorization and valid execution and delivery by DoCoMo, is a
     valid and legally binding obligation of AT&T, enforceable against it in
     accordance with its terms subject to bankruptcy, insolvency, fraudulent
     transfer, reorganization, moratorium and similar laws of general
     applicability relating to or affecting creditors' rights.

          Section 2.2 REPRESENTATIONS AND WARRANTIES OF AT&T WIRELESS. AT&T
Wireless represents and warrants to DoCoMo as of the date hereof as follows:

          (a) AT&T Wireless has been duly incorporated and is validly existing
     in good standing under the laws of the State of Delaware, and has all
     requisite power and authority to execute and deliver this Agreement and to
     perform its obligations hereunder and to consummate the transactions
     contemplated hereby.

          (b) This Agreement and all transactions contemplated hereby have been
     duly and validly authorized by all necessary action on the part of AT&T
     Wireless.

          (c) This Agreement has been duly executed and delivered by AT&T
     Wireless and, assuming due authorization and valid execution and delivery
     by DoCoMo, is a valid and legally binding obligation of AT&T Wireless,
     enforceable against it in accordance with its terms subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization,

                                      -10-
<PAGE>

moratorium and similar laws of general applicability relating to or affecting
creditors' rights.

          Section 2.3 REPRESENTATIONS AND WARRANTIES OF DOCOMO AND EACH
DESIGNEE. DoCoMo and each Designee represents and warrants to AT&T and AT&T
Wireless as of the date hereof or, with respect to any Designee that becomes
such after the date hereof, as of the date that such Designee becomes such, as
follows:

          (a) DoCoMo and each Designee has been duly incorporated and is validly
     existing and in good standing under the laws of the jurisdiction of its
     organization and has all requisite power and authority to execute and
     deliver this Agreement and to perform its obligations hereunder and to
     consummate the transactions contemplated hereby.

          (b) This Agreement and all transactions contemplated hereby have been
     duly and validly authorized by all necessary action on the part of DoCoMo
     and each Designee.

          (c) This Agreement has been duly executed and delivered by DoCoMo and
     each Designee and, assuming due authorization and valid execution and
     delivery by AT&T and AT&T Wireless, is a valid and legally binding
     obligation of DoCoMo and each Designee, enforceable against it in
     accordance with its terms subject to bankruptcy, insolvency, fraudulent
     transfer, reorganization, moratorium and similar laws of general
     applicability relating to or affecting creditors' rights.

                                  ARTICLE III

                      GOVERNANCE AND STANDSTILL PROVISIONS

          Section 3.1 BOARD OF DIRECTORS. (a) At the Closing or as soon as
reasonably practicable thereafter (but in no event later than the first meeting
of the AT&T Board held after the Closing), (i) the number of directors on the
AT&T Board will be increased by one and (ii) the AT&T Board will elect to the
AT&T Board a senior officer of DoCoMo to be designated in writing to AT&T at
least 10 days prior to the Closing Date who is reasonably acceptable to AT&T
(the "DOCOMO AT&T NOMINEE"). If no such person reasonably acceptable to AT&T is
identified at least 10 days prior to the Closing Date, then the AT&T Board shall
not be obligated to elect such person until the tenth day following the date a
reasonably acceptable senior officer of DoCoMo is identified in writing to AT&T.
Until the earlier of (x) the consummation of the Spin-off or (y) an Investor
Rights Termination Event, at any annual or special meeting of shareholders of
AT&T at which Directors are to be elected (and at which the seat held by the
DoCoMo AT&T Nominee is subject to election), AT&T shall renominate the DoCoMo
AT&T Nominee, or nominate another senior officer of DoCoMo designated by DoCoMo
who is reasonably acceptable to AT&T, to be elected to the AT&T Board, and shall
use its reasonable efforts to cause such person to be elected to such position.
DoCoMo shall notify AT&T of its proposed nominee to the AT&T Board, in writing,
no later than 30 days prior to the first anniversary of the mailing of the proxy
statement related to the previous year's annual meeting of stockholders,
together with all information concerning such nominee reasonably requested by
AT&T, so that AT&T may determine whether such nominee is reasonably acceptable
to AT&T

                                      -11-
<PAGE>

and so that AT&T can comply with applicable disclosure rules (the "NOMINEE
DISCLOSURE INFORMATION"); PROVIDED that in the event DoCoMo fails to provide any
such notice, the DoCoMo AT&T Nominee shall be the person then serving in such
capacity hereunder as long as DoCoMo provides the Nominee Disclosure Information
to AT&T promptly upon request by AT&T. Concurrently with electing such person to
the AT&T Board pursuant to the first two sentences of this Section 3.1(a), the
AT&T Board will elect the DoCoMo AT&T Nominee to the AT&T Wireless Capital Stock
Committee, and, so long as DoCoMo has the right pursuant to this Section 3.1(a)
to have its nominee nominated for election to the AT&T Board, the DoCoMo AT&T
Nominee will be a member of the AT&T Wireless Capital Stock Committee. In the
event of the death, disability, resignation or removal of the DoCoMo AT&T
Nominee, the AT&T Board will promptly elect to the AT&T Board a senior officer
of DoCoMo designated by DoCoMo who is reasonably acceptable to AT&T to fill the
resulting vacancy, which such individual shall then be deemed a DoCoMo AT&T
Nominee for all purposes hereunder. All obligations of AT&T pursuant to this
Section 3.1(a) shall terminate, and DoCoMo shall cause the DoCoMo AT&T Nominee
to resign from the AT&T Board and all committees thereof (including the AT&T
Wireless Capital Stock Committee) immediately upon the earlier of (x) the
consummation of the Spin-off and (y) the occurrence of an Investor Rights
Termination Event. The obligations of AT&T pursuant to this Section 3.1(a), and
the obligations of AT&T Wireless pursuant to Sections 3.1(b) and (c), shall also
be subject to limitation or termination as otherwise expressly set forth herein,
including pursuant to Sections 3.6(c), 4.3(d) and 10.2(e).

          (b) Following the consummation of the Spin-off, for so long as an
Investor Rights Termination Event has not occurred, DoCoMo will be entitled to
designate a number of nominees (the "DOCOMO AT&T WIRELESS NOMINEES") to the AT&T
Wireless Board in proportion to DoCoMo's Economic Interest Percentage in AT&T
Wireless (such number of nominees to be rounded up in the case of a fraction of
 .5 or greater or down in the case of a fraction less than .5 to the nearest
whole number), without reference to any Economic Interests acquired after the
Closing other than by the exercise of Preemptive Rights or upon exercise of the
Warrants (or acquired in exchange for such Economic Interests in connection with
the Spin-off); PROVIDED that, unless an Investor Rights Termination Event has
occurred, in no event shall the number of DoCoMo AT&T Wireless Nominees be less
than one. Each DoCoMo AT&T Wireless Nominee shall be a senior officer of DoCoMo
and be reasonably acceptable to AT&T Wireless. AT&T and AT&T Wireless agree to
cause the AT&T Wireless Board as of immediately prior to the consummation of the
Spin-off to be classified into three classes. AT&T and AT&T Wireless agree that
the initial DoCoMo AT&T Wireless Nominees shall be staggered among such classes,
PROVIDED that in the event there are fewer than three DoCoMo AT&T Wireless
Nominees, AT&T and AT&T Wireless agree that the initial DoCoMo AT&T Wireless
Nominees (in the event there are two) will be appointed to the classes the terms
of which will expire at the second and third annual meeting of shareholders
following the consummation of the Spin-off, or that the initial DoCoMo AT&T
Wireless Nominee (in the event there is only one) will be appointed to the class
the term of which will expire at the third annual meeting of shareholders
following the consummation of the Spin-off, and in any event that as of the
consummation of the Spin-off the DoCoMo AT&T Wireless Nominees shall be members
of the AT&T Wireless Board.

          (c) Until an Investor Rights Termination Event has occurred, at any
annual or special meeting of shareholders at which Directors of AT&T Wireless
are to be elected (and after

                                      -12-
<PAGE>

which, if a DoCoMo AT&T Wireless Nominee were not elected, there would not exist
the number of DoCoMo AT&T Wireless Nominees to which DoCoMo is then entitled
pursuant to Section 3.1(b)), AT&T Wireless shall nominate another senior officer
of DoCoMo designated by DoCoMo who is reasonably acceptable to AT&T Wireless, to
be elected to the AT&T Wireless Board, and shall use its reasonable efforts to
cause such person to be elected to such position. DoCoMo shall notify AT&T
Wireless of each proposed nominee to the AT&T Wireless Board, in writing, a
reasonable time in advance of the mailing of any proxy statement, information
statement or registration statement in which any Board nominee or Board member
of AT&T Wireless would be named (which in the event of any proxy statement
relating to an annual meeting of stockholders of AT&T Wireless, other than the
first such annual meeting, shall be no later than 30 days prior to the first
anniversary of the mailing of the proxy statement related to the previous year's
annual meeting of stockholders), together with all the Nominee Disclosure
Information; PROVIDED that in the event DoCoMo fails to provide any such notice,
the DoCoMo AT&T Wireless Nominees shall be the persons, if any, then serving in
such capacity hereunder as long as DoCoMo provides the Nominee Disclosure
Information to AT&T promptly upon request by AT&T. In the event of the death,
disability, resignation or removal of any DoCoMo AT&T Wireless Nominee at a time
when DoCoMo is otherwise entitled to nominate a director to fill such vacancy,
the AT&T Wireless Board will promptly elect to the AT&T Wireless Board a senior
officer of DoCoMo designated by DoCoMo who is reasonably acceptable to AT&T
Wireless to fill the resulting vacancy, which such individual shall then be
deemed a DoCoMo AT&T Wireless Nominee for all purposes hereunder. All
obligations of AT&T Wireless pursuant to this Section 3.1(c) shall terminate,
and DoCoMo shall cause all DoCoMo AT&T Wireless Nominees to resign from the AT&T
Wireless Board, immediately upon the occurrence of an Investor Rights
Termination Event. In addition, DoCoMo will cause any excess DoCoMo AT&T
Wireless Nominees to resign at any time that there exist more DoCoMo AT&T
Wireless Nominees than DoCoMo is entitled to hereunder. DoCoMo will cause such
resignation to occur within 60 days, in the case of a reduction in the number of
DoCoMo AT&T Wireless Nominees to which it is entitled, or within 10 Business
Days in the case of a loss of its right to nominate any Board nominees. In the
case of a loss of the right to nominate any Board nominees, no DoCoMo AT&T
Wireless Nominees will vote or exercise any other rights or powers of office
during the period pending resignation. In the event that at any time prior to
the occurrence of an Investor Rights Termination Event, DoCoMo becomes entitled
pursuant to Section 3.1(b) as a result of the exercise of its Preemptive Rights
to designate a greater number of DoCoMo AT&T Wireless Nominees than it has at
such time, AT&T Wireless agrees to use its reasonable efforts to cause to be
appointed to the AT&T Wireless Board in accordance with the last sentence of
this paragraph a number of new DoCoMo AT&T Wireless Nominees such that the
number of existing DoCoMo AT&T Wireless Nominees or the AT&T Wireless Board
equals the number to which DoCoMo is entitled at that time pursuant to Section
3.1(b), such appointment or appointments to be made not later than the first
meeting of the AT&T Wireless Board held at least 10 Business Days subsequent to
the date AT&T Wireless receives notification of the identity of such new DoCoMo
AT&T Wireless Nominee and the Nominee Disclosure Information with respect to
such person. Any such new DoCoMo AT&T Wireless Nominees shall be senior officers
of DoCoMo reasonably acceptable to AT&T Wireless.

          (d) An "INVESTOR RIGHTS TERMINATION EVENT" shall be deemed to have
occurred if, for any period of 60 consecutive days, DoCoMo has an Economic
Interest Percentage in AT&T Wireless that is less than 10%; PROVIDED, HOWEVER,
that so long as DoCoMo has not

                                      -13-
<PAGE>

Transferred from and after the Closing Date in the aggregate (other than to its
direct or indirect wholly owned Subsidiaries that at the time of determination
remain direct or indirect wholly owned Subsidiaries) in excess of 304,692
Original Investment Shares (with each share of Current Wireless Tracking Stock
or AT&T Wireless Common Stock included within the Original Investment Shares
being counted as 1/500 of a share, appropriately adjusted in the event of any
anti-dilution adjustments to the conversion rights of the New Tracking Stock or
in the event the Spin-off exchange ratio of AT&T Wireless Common Stock for
Current Wireless Tracking Stock is other than one-for-one), an Investor Rights
Termination Event will be deemed to occur only if for a period of 60 consecutive
days DoCoMo has an Economic Interest Percentage in AT&T Wireless that is less
than 8%. The 60 consecutive day periods referred to in this definition shall be
tolled beginning on the fifty-ninth consecutive day, for a period (the "TOLLING
PERIOD") of not more than an additional six months, if (1) DoCoMo has exercised
Preemptive Rights hereunder prior to the thirtieth consecutive day and such
exercise would result in DoCoMo having an Economic Interest Percentage
sufficient to avoid an Investor Rights Termination Event, (2) DoCoMo has not
completed the acquisition of securities pursuant to such exercise of Preemptive
Rights as of such fifty-ninth day solely because a required regulatory approval
has not been received or an applicable regulatory waiting period has not expired
or terminated, and (3) DoCoMo has used and continues in good faith to use all
reasonable efforts to complete the acquisition of securities pursuant to such
exercise of Preemptive Rights, including seeking such regulatory approvals or
expirations or terminations of applicable waiting periods; PROVIDED that such
period shall cease to be tolled and shall resume running as if from the
fifty-ninth consecutive day immediately upon any of (w) DoCoMo failing or
ceasing to act in accordance with clause (3) above, (x) any application for a
required regulatory approval being denied and such denial becoming final and
nonappealable, (y) any event occurring as a result of which clause (2) above is
no longer true and correct, or (z) DoCoMo Transfering any securities, or failing
to exercise any subsequent Preemptive Rights, such that completion of the
exercise of Preemptive Rights with respect to which the Tolling Period applies
would not result in DoCoMo having an Economic Interest Percentage sufficient to
avoid an Investor Rights Termination Event.

          Section 3.2 PRE-SPIN-OFF GOVERNANCE RIGHTS. (a) Subject to Sections
3.2(b) and (c) hereof, prior to the consummation of the Spin-off, AT&T will not,
and will not permit its Subsidiaries to, take any of the following actions
without the prior written consent of DoCoMo:

          (i)  a sale of all or substantially all the assets of the Wireless
               Group taken as a whole;

          (ii) a merger, consolidation or similar business combination involving
               all or substantially all of the business of the Wireless Group,
               other than any such transaction in which the holders of the
               Economic Interests in the Wireless Group as of immediately prior
               to the consummation of the first of such transactions to occur
               after November 30, 2000 continue to hold, directly or indirectly,
               at least two-thirds of such Economic Interests following each of
               such transactions;

         (iii) the acquisition (including by merger or other similar
               transaction) of any business or assets by the Wireless Group or
               by AT&T on behalf of or that

                                      -14-
<PAGE>

               are to be contributed to the Wireless Group, PROVIDED that AT&T
               or the Wireless Group may make such acquisitions to the extent
               that the consideration paid by AT&T or the Wireless Group with
               respect to all such acquisitions made after November 30, 2000
               does not exceed $17 billion (other than acquisitions of spectrum,
               which may be made without regard to and without counting against
               such dollar limitation);

          (iv) any further issuance of Economic Interests in or rights to the
               Wireless Group (including the issuance of additional shares of
               New Tracking Stock or Current Wireless Tracking Stock but
               excluding issuances of shares of Economic Interests pursuant to
               the Purchase Agreement or upon the exercise of Preemptive
               Rights), except: (A) for issuances of Economic Interests in the
               Wireless Group that do not, in the aggregate for all such
               issuances made after November 30, 2000, exceed 15% of the market
               capitalization (including the value of AT&T's Retained Wireless
               Interest) of the Wireless Group as of November 30, 2000; (B) with
               respect to the issuance to officers, employees or directors of
               Current Wireless Tracking Stock or options to acquire shares of
               Current Wireless Tracking Stock (or options exercisable after the
               Spin-off to acquire AT&T Wireless Common Stock) in the ordinary
               course of business consistent with past practice or in connection
               with the Spin-off; (C) issuances of Current Wireless Tracking
               Stock upon exercise of such options; (D) issuances of Current
               Wireless Tracking Stock in connection with acquisitions or merger
               transactions not prohibited by clauses (ii) and (iii) hereof; (E)
               issuances of New Tracking Stock upon exercise of the Warrants or
               of Current Wireless Tracking Stock upon conversion of shares of
               New Tracking Stock or upon exercise of the Warrants; and (F) the
               issuance of shares of Current Wireless Tracking Stock that
               reflects the disposition of any portion of AT&T's Retained
               Wireless Interest, including without limitation in the publicly
               announced proposed exchange offer of Current Wireless Tracking
               Stock for common stock of AT&T (the "EXCHANGE OFFER") to be
               effected prior to the Spin-off (provided that in any such
               disposition to a party unaffiliated with AT&T that is not in
               connection with the Spin-off or Exchange Offer, no Person or
               group of related Persons may acquire any governance or board
               participation rights in excess of the normal rights of ownership
               of Current Wireless Tracking Stock); PROVIDED that the aggregate
               issuances after November 30, 2000 permitted in clauses (A)
               through (D) of this clause (iv) shall not result in the holders
               of the Economic Interests in the Wireless Group immediately after
               giving effect to the Investment ceasing to hold at least
               two-thirds of such Economic Interests following such issuances;

          (v)  the payment of any cash dividends to holders of the Current
               Wireless Tracking Stock, any repurchase of Current Wireless
               Tracking Stock (other than repurchases (A) to offset option
               exercises by employees, (B) repurchases which are not material in
               amount in connection with employee settlements or similar matters
               and (C) other repurchases for

                                      -15-
<PAGE>

               consideration not in excess of $5 million in the aggregate) or
               any repurchase of AT&T's Retained Wireless Interest (it being
               understood that the allocation of a portion of the proceeds of
               the Investment to AT&T and the resulting adjustment of the
               Wireless Group Allocation Fraction to reduce AT&T's Retained
               Wireless Interest shall not give rise to a veto right under this
               provision); and

          (vi) any (A) amendment to the certificate of incorporation (including
               with respect to the definition of the "Wireless Group" or the
               "Wireless Group Allocation Fraction" therein) or by-laws of AT&T
               to the extent such amendments would have an adverse effect on the
               rights of the holders of the New Tracking Stock (it being
               understood that any proposed amendment to the certificate of
               incorporation of AT&T to reduce the required vote for a merger or
               for a sale or other disposition of substantially all the assets
               from the currently required two-thirds vote to a simple majority
               vote will not violate this provision), (B) changes to the
               Separation Agreements that would, in the aggregate, have a
               material adverse effect on the Wireless Group, or (C) material
               new agreements between AT&T or its Subsidiaries (other than AT&T
               Wireless and its Subsidiaries), on the one hand, and the Wireless
               Group, on the other hand, other than those that are on
               arm's-length terms comparable to those which the Wireless Group
               would enter into with an unaffiliated third party.

          (b) The foregoing notwithstanding, DoCoMo will not have any right to
veto (i) the Spin-off, (ii) any redemption of the New Tracking Stock pursuant to
the terms of the New Tracking Stock or (iii) any redemption of the Current
Wireless Tracking Stock.

          (c) The foregoing notwithstanding, DoCoMo will cease to have any
rights, and AT&T and AT&T Wireless will cease to have any obligations, under
this Section 3.2 upon the occurrence of an Investor Rights Termination Event.
The rights of DoCoMo under this Section 3.2 shall also be subject to limitation
or termination as otherwise expressly set forth herein, including pursuant to
Section 4.3(d).

          Section 3.3 POST-SPIN-OFF GOVERNANCE RIGHTS. (a) Following the
Spin-off, AT&T Wireless will not take any of the following actions without
DoCoMo's prior written consent:

          (i)  change the scope of its business such that the Wireless Group's
               current businesses (including those businesses that are part of
               the Wireless Group's current business plan and including any
               natural evolution of such current businesses) taken as a whole no
               longer constitute AT&T Wireless's primary business; or

          (ii) enter into a strategic alliance with another Wireless Operator
               that would result in such Wireless Operator owning more than 15%
               but less than 50% of the Economic Interests in AT&T Wireless (it
               being understood that a merger with a third party that results in
               a Wireless Operator owning more

                                      -16-
<PAGE>

               than 15% but less than 50% of the resulting entity by reason of
               such Wireless Operator's prior shareholdings in such third party
               shall not be deemed to violate this clause (ii) unless such
               merger is undertaken solely to effect such a strategic alliance
               with such Wireless Operator).

          For purposes of the foregoing, "WIRELESS OPERATOR" shall mean any
Person that owns or operates a Mobile Telecommunications Infrastructure or that
is a Reseller.

          (b) DoCoMo will cease to be entitled to the foregoing veto rights upon
the occurrence of an Investor Rights Termination Event. The foregoing rights
shall also be subject to limitation or termination as otherwise expressly set
forth herein, including pursuant to Section 4.3(d).

          Section 3.4 SENIOR LEADERSHIP TEAM. From and after the Closing, AT&T
Wireless hereby agrees that DoCoMo will be entitled to select one senior
executive of DoCoMo reasonably acceptable to AT&T Wireless to be a member of
AT&T Wireless's Senior Leadership Team and to participate in its meetings, which
will be scheduled regularly and no less frequently than monthly. AT&T Wireless
hereby represents and warrants to DoCoMo that AT&T Wireless's Senior Leadership
Team is the current body (other than the AT&T Board and its committees) in which
principal decisions with respect to the Wireless Group are discussed by the
principal decision-makers of AT&T Wireless. The members of the Senior Leadership
Team as of November 30, 2000 are set forth in Schedule 3.4 hereto. AT&T Wireless
hereby agrees to give DoCoMo's designee at least three Business Days' notice of
meetings of its Senior Leadership Team, to the extent practicable, and in any
event will use its reasonable efforts to provide such individual at least as
much notice of meetings as is given to the other members of the Senior
Leadership Team. DoCoMo's designee may attend such meetings by telephone and,
upon request, will be given a briefing by another member of the Senior
Leadership Team with respect to any meeting that such individual does not
attend. AT&T Wireless hereby agrees that the senior executive designated by
DoCoMo will also be a member of any similar AT&T Wireless body that may be
formed to address matters of similar importance to the matters currently
considered by AT&T Wireless's Senior Leadership Team. AT&T Wireless's
obligations and DoCoMo's rights under this Section 3.4 shall terminate on the
earlier of (a) consummation of the Spin-off or (b) the occurrence of an Investor
Rights Termination Event. Such obligations and rights shall also be subject to
limitation or termination as otherwise expressly set forth herein, including
pursuant to Sections 3.6(c), 4.3(d) and 10.2(e).

          Section 3.5 MANAGEMENT POSITIONS. (a) AT&T Wireless agrees that, both
before and after the Spin-off, DoCoMo will have the right to appoint at least
two and no more than five of its employees as employees of AT&T Wireless, with
such titles as "Manager-Finance" and/or "Director of Technology" of AT&T
Wireless (and such other titles as may be agreed with AT&T Wireless), and such
employees will have powers, obligations and responsibilities consistent with
such titles. Such employees will report directly to the Chief Financial Officer,
Chief Technology Officer or, with respect to other titles, to other appropriate
officers of AT&T Wireless. DoCoMo's nominees for such appointments, and the
continued employment by AT&T Wireless of such individuals, will be subject to
the reasonable approval of AT&T Wireless. So long as DoCoMo has the right
pursuant to this Section 3.5(a) to have the right to appoint employees, in the
event of the death, disability, resignation or termination of any

                                      -17-
<PAGE>

such employee, DoCoMo shall be entitled to appoint a replacement, subject to the
reasonable approval of AT&T Wireless.

          (b) DoCoMo will cease to have any rights under, and AT&T Wireless will
cease to have any obligations under, this Section 3.5 upon the occurrence of an
Investor Rights Termination Event. DoCoMo will cause the resignation of its
employees appointed pursuant to Section 3.5(a) to occur within 10 Business Days
following the loss of such rights, and no DoCoMo appointee will vote or exercise
any other rights or powers of office during such 10-Business Day period. Such
rights and obligations shall also be subject to limitation or termination as
otherwise expressly set forth herein, including pursuant to Sections 3.6(c) and
4.3(d).

          Section 3.6 STANDSTILL RESTRICTIONS. (a) Subject to Section 3.7, prior
to the fifth anniversary of the Closing Date, DoCoMo shall not, and shall not
permit any of its Standstill Affiliates to, in any manner, whether publicly or
otherwise, directly or indirectly, without the prior written consent of AT&T (to
the extent related to AT&T or its securities, Subsidiaries or assets) or AT&T
Wireless (to the extent related to AT&T Wireless or its securities, Subsidiaries
or assets):

          (i)  acquire, agree to acquire or make any public proposal to acquire,
               directly or indirectly, Beneficial Ownership of any voting
               securities or assets of AT&T or AT&T Wireless or the Subsidiaries
               of either, except (A) pursuant to the exercise of Preemptive
               Rights pursuant to Article VIII, (B) the acquisition of shares of
               Current Wireless Tracking Stock upon conversion of shares of New
               Tracking Stock in accordance with the terms of the New Tracking
               Stock, (C) the acquisition of shares of New Tracking Stock,
               Current Wireless Tracking Stock or AT&T Wireless Common Stock
               upon exercise of Warrants in accordance with the terms of the
               Warrants, (D) the acquisition of shares of AT&T Wireless Common
               Stock in exchange for shares of Current Wireless Tracking Stock
               pursuant to the Spin-off (provided that such shares of Current
               Wireless Tracking Stock shall have been acquired in accordance
               with the foregoing), (E) the acquisition of securities by DoCoMo
               or any of its wholly owned subsidiaries (who agree to become
               Designees as a result of such acquisition) from DoCoMo or any of
               its Designees in accordance with and to the extent permitted by
               Section 6.1(a) hereof, (F) Beneficial Ownership resulting from
               the acquisition of interests in any unrelated Person that has
               Beneficial Ownership of shares of Current Wireless Tracking Stock
               or AT&T Wireless Common Stock, PROVIDED, in the case of this
               clause (F) that (1) the acquisition of Beneficial Ownership of
               Current Wireless Tracking Stock or AT&T Wireless Common Stock was
               not an important purpose of the acquisition of interest in such
               unrelated Person, (2) DoCoMo or the relevant Standstill Affiliate
               divests, or causes the unrelated Person to divest, any such
               shares of Current Wireless Tracking Stock or AT&T Wireless Common
               Stock as promptly as commercially practicable and, until such
               divestiture, does not, and causes such unrelated Person not to,
               vote any such shares other than in accordance with this

                                  -18-
<PAGE>

               Agreement, and (3) any such shares of Current Wireless Tracking
               Stock or AT&T Wireless Common Stock shall not be counted in any
               calculation of DoCoMo's Economic Interest Percentage, and (G)
               Beneficial Ownership of Current Wireless Tracking Stock or AT&T
               Wireless Common Stock arising from equity compensation issued to
               DoCoMo employees seconded to the Wireless Group or AT&T Wireless
               or its Subsidiaries, PROVIDED, in the case of this clause (G)
               that (1) if DoCoMo or any of its Standstill Affiliates comes to
               have direct ownership of any such shares issued to any such
               seconded employee (including upon exercise of any option), DoCoMo
               or the relevant Standstill Affiliate shall divest any such shares
               as promptly as practicable and, until such divestiture, shall
               not, and shall cause such employee not to, vote any such shares
               other than in accordance with this Agreement, and (2) any such
               shares of Current Wireless Tracking Stock or AT&T Wireless Common
               Stock shall not be counted in any calculation of DoCoMo's
               Economic Interest Percentage;

          (ii) enter into or publicly propose to enter into, directly or
               indirectly, any merger or other business combination or similar
               transaction or change in control transaction involving AT&T or
               AT&T Wireless, or the Subsidiaries of either;

         (iii) make, or in any way participate, directly or indirectly, in any
               "solicitation" of "proxies" (as such terms are used in the proxy
               rules of the SEC) to vote, or seek to advise or influence any
               Person with respect to the voting of, any securities of AT&T or
               AT&T Wireless, or the Subsidiaries of either;

          (iv) call, or seek to call, a meeting of the shareholders of AT&T or
               AT&T Wireless or initiate any shareholder proposal for action by
               shareholders of AT&T or AT&T Wireless;

          (v)  bring any action or otherwise act to contest the validity of any
               of the provisions of this Section 3.6 or seek a release of the
               restrictions contained in this Section 3.6, in each case in any
               manner that would require or lead to public disclosure thereof;

          (vi) form, join or in any way participate in a "group" (within the
               meaning of Section 13(d)(3) of the Exchange Act) that, with
               respect to any securities of AT&T or AT&T Wireless or any
               Subsidiary of either, would be required under Section 13(d) of
               the Exchange Act and the rules and regulations thereunder to file
               a Statement on Schedule 13D with the SEC as a "person" (within
               the meaning of Section 13(d)(3) of the Exchange Act);

         (vii) seek representation on the Board of AT&T or AT&T Wireless, other
               than any seat on the Board with respect to which DoCoMo is then
               entitled to make a nomination pursuant to Section 3.1 of this
               Agreement, or seek the removal of any Directors (other than the
               DoCoMo AT&T Nominee or the

                                      -19-
<PAGE>

               DoCoMo AT&T Wireless Nominees) from either such board or seek a
               change in size or composition of either such board (including,
               without limitation, by voting for any directors not nominated by
               the Board of AT&T or AT&T Wireless);

        (viii) enter into any discussions, negotiations or arrangements
               (whether written or oral) with any other Person with respect to
               any of the foregoing (other than action taken by a Director in
               his or her capacity as a member of the Board of AT&T or AT&T
               Wireless or taken by an employee of AT&T Wireless in the
               authorized course of such employment);

          (ix) disclose any intention, plan or arrangement inconsistent with the
               foregoing;

          (x)  take, or solicit, or propose to or agree with any other Person to
               take, any actions designed to obtain, affect or change the
               control of the Board, senior executive management or voting
               equity of AT&T or AT&T Wireless (other than action taken by a
               Director in his or her capacity as a member of the Board of AT&T
               or AT&T Wireless and, with respect to the senior executive
               management of AT&T Wireless, as expressly contemplated
               hereunder); or

          (xi) advise, assist or encourage any other Persons in connection with
               any of the foregoing.

          (b) Prior to the fifth anniversary of the Closing Date, without
limiting Section 3.6(a), in the event DoCoMo's Ultimate Parent or any of its
Ultimate Parent's Subsidiaries (other than DoCoMo and its Controlled
Subsidiaries), or, when acting on behalf of the Ultimate Parent or such
Subsidiaries, any Affiliate thereof, takes any action of the types referred to
in any of clauses (i) - (xi) of Section 3.6(a) hereof, then, without limiting
any of the obligations of DoCoMo and its Controlled Subsidiaries under Section
3.6(a) hereof, DoCoMo and its Controlled Subsidiaries shall not:

          (i)  with respect to any matter proposed or supported by DoCoMo's
               Ultimate Parent (or its Subsidiaries or Affiliates) or any vote
               of AT&T's or AT&T Wireless's stockholders related to or occurring
               as a result of any such action by DoCoMo's Ultimate Parent (or
               its Subsidiaries or Affiliates), vote any of their securities of
               AT&T or AT&T Wireless other than, at DoCoMo's election, either
               (A) as directed by the Board or (B) in proportion to the votes
               cast by the stockholders of AT&T or AT&T Wireless who are not
               Affiliates of DoCoMo or of DoCoMo's Ultimate Parent, and

          (ii) with respect to any tender or exchange offer or other offer to
               purchase securities proposed or supported by DoCoMo's Ultimate
               Parent (or its Affiliates or Subsidiaries), tender, offer, sell
               or transfer any of their securities of AT&T or AT&T Wireless to
               the Person making such offer

                                      -20-
<PAGE>

               without the prior written consent of the Board; PROVIDED,
               HOWEVER, that DoCoMo and its Controlled Subsidiaries may tender
               their shares of Current Wireless Tracking Stock or AT&T Wireless
               Common Stock into such a tender offer after (but only after) such
               time as all material conditions to such offer (including any
               financing condition and any condition with respect to removal of
               AT&T Wireless's rights plan or any other takeover protections)
               that are capable of being satisfied prior to expiration of the
               offer have been satisfied or irrevocably waived by the offeror;
               PROVIDED, FURTHER, that DoCoMo and its Controlled Subsidiaries
               shall not, prior to such time, announce or disclose their intent
               to tender their shares into such offer following satisfaction or
               waiver of such conditions.

          (c) From and after the fifth anniversary of the Closing Date, and for
so long as DoCoMo has the right to nominate a Director pursuant to Section 3.1
hereof, DoCoMo shall not and shall not permit any of its Standstill Affiliates
to, take any action described in either of Section 3.6(a) or Section 3.6(b)
hereof, PROVIDED, HOWEVER, that DoCoMo shall be released from the restrictions
of and its obligations under this Section 3.6(c) on the 91st day after both of
the following events have occurred: (i) all DoCoMo AT&T Nominees and all DoCoMo
AT&T Wireless Nominees shall have resigned and DoCoMo shall not have replaced
any of them with new representatives or nominees, and (ii) all other DoCoMo
representatives or designees appointed to the management or any governance body
or committee of AT&T Wireless (including under Sections 3.1, 3.4, 3.5 and 5.4
hereunder) shall have resigned and shall not have been replaced with new DoCoMo
representatives or designees. Immediately upon the resignation of all of
DoCoMo's representatives or designees appointed to the management or any
governance body or committee of AT&T Wireless (including under Sections 3.1,
3.4, 3.5 and 5.4 hereunder) as contemplated by the foregoing clause (ii), (A)
DoCoMo shall be deemed to have irrevocably waived its rights to Board
representation and to designate any representatives or designees to the
management or any governance body or committee hereunder (including under
Sections 3.1, 3.4, 3.5 and 5.4 hereunder), but shall not be deemed to have
waived any rights it may have as a result of being a shareholder of AT&T
Wireless and (B) AT&T Wireless may take such action with respect to any other
employees of, or persons providing service to, AT&T Wireless (including the MMS)
in its sole discretion, including terminating or sequestering or separating such
employees, without regard to the fact that any such persons may have been
appointed or nominated by DoCoMo. The foregoing notwithstanding, in the event
the resignations contemplated by foregoing clauses (i) and (ii) occur
concurrently with the delivery by DoCoMo to AT&T or AT&T Wireless, as the case
may be, of a notice to the effect that such resignations are not intended to
commence the 90-day time period for releasing DoCoMo from the restrictions of
and its obligations under this Section 3.6 and that DoCoMo intends to replace
the individuals who have resigned, then such 90-day time period will not
commence and the consequences set forth in the foregoing clauses (A) and (B)
will not apply.

          (d) From and after the Spin-off, the obligations set forth above, to
the extent related to AT&T and its Subsidiaries and assets, but not to AT&T
Wireless and its Subsidiaries and assets, shall be enforceable by AT&T, and not
by AT&T Wireless.

                                      -21-
<PAGE>

          (e) DoCoMo agrees not to provide to DoCoMo's Ultimate Parent or its
Subsidiaries (including as a result of any representation DoCoMo's Ultimate
Parent or Subsidiaries may have on the DoCoMo board or in DoCoMo management),
other than DoCoMo and its Subsidiaries, any non-public information concerning
AT&T or AT&T Wireless or any of their respective Subsidiaries or businesses
obtained by DoCoMo as a result of its Board, management or other rights under
this Agreement or any of the Related Agreements or as a result of its investment
in AT&T or AT&T Wireless; PROVIDED that DoCoMo may provide to its Ultimate
Parent such non-public information to the extent, but only to the extent, DoCoMo
and its Ultimate Parent are required to obtain such non-public information in
order to prepare such consolidated financial reports as either of them is
required to prepare under applicable law, but only so long as (i) such
non-public information is disclosed pursuant to customary confidentiality
restrictions that (A) limit dissemination of such information to those employees
and agents of DoCoMo and its Ultimate Parent having a need to know in connection
with the preparation of such consolidated financial reports, (B) prohibit public
disclosure of such non-public information and (C) prohibit inclusion of such
information in any portion of the consolidated financial reports that become
publicly disclosed, in each case prior to the time any such information is
publicly disclosed by AT&T or AT&T Wireless, as the case may be, (ii) DoCoMo
agrees to be responsible for the performance by its Ultimate Parent of the
provisions of this paragraph and otherwise to use all reasonable efforts to
prevent such non-public information from becoming disclosed or disseminated,
prior to the time any such information is publicly disclosed by AT&T or AT&T
Wireless, as the case may be, other than to those having a need to know in
connection with the preparation of such consolidated financial reports, and
(iii) DoCoMo concurrently provides to AT&T and AT&T Wireless a copy of the
information so disclosed to its Ultimate Parent and DoCoMo certifies to its
compliance with respect to the foregoing clauses (i) and (ii).

          Section 3.7 TERMINATION OF THE STANDSTILL RESTRICTIONS. (a) To the
extent the restrictions on and the obligations of DoCoMo and its Standstill
Affiliates under Sections 3.6(a), (b) and (c) relate to AT&T Wireless or its
securities, Subsidiaries or assets, such restrictions and obligations shall
terminate if any of the following three events occurs:

          (i)  a third party unaffiliated with AT&T Wireless commences a tender
               or exchange offer seeking to acquire 15% or more of AT&T
               Wireless's outstanding voting securities and AT&T Wireless does
               not (within 10 Business Days following such commencement)
               publicly recommend that its shareholders not accept such offer;

          (ii) AT&T Wireless enters into a definitive agreement (or binding
               letter of intent) with a third party (or group of related
               parties) to effectuate a merger or consolidation with or sale of
               all or substantially all of its assets and properties to, any
               unaffiliated third party, unless immediately following such
               transaction the Persons that immediately prior to such
               transaction held the AT&T Wireless Common Stock hold, directly or
               indirectly, at least 50% of the equity and at least 50% of the
               voting power of the entity surviving such merger or consolidation
               or to whom such assets will be transferred; or

                                      -22-
<PAGE>

          (iii) if AT&T Wireless enters into a definitive agreement (or binding
               letter of intent) providing for a sale by AT&T Wireless of AT&T
               Wireless securities, or a merger or consolidation, in either case
               that would result in any one Person (or group of related Persons)
               acquiring in excess of 35% of the voting power of AT&T Wireless
               outstanding after completion of such transaction; provided that
               (x) if the acquiror of the greater-than 35% block is subject to a
               standstill that restricts its ability to acquire more than its
               initial percentage of the voting power of AT&T Wireless or to
               appoint a majority of its board of directors (and such standstill
               is otherwise on substantially similar terms as the provisions of
               Section 3.6 or, to the extent such other terms are not
               substantially similar to the provisions of Section 3.6, AT&T
               Wireless amends the provisions of Section 3.6 to make the
               provisions of Section 3.6 substantially similar to such terms of
               the other standstill), then the obligations set forth in Section
               3.6 (as so amended, if applicable) shall not terminate by virtue
               of this clause (iii) unless and until the standstill restrictions
               on the acquiror lapse or are waived, and (y) anything in this
               clause (iii) notwithstanding, DoCoMo shall continue to be subject
               to each provision of Section 3.6 to the extent such provision
               relates to the ability of DoCoMo to support, encourage, cooperate
               with, participate with or act as a group or in concert with the
               greater-than-35% acquiror with respect to the securities of AT&T
               Wireless or AT&T Wireless's Board or management.

          (b) To the extent the restrictions on and the obligations of DoCoMo
and its Standstill Affiliates under Sections 3.6(a), (b) and (c) relate to AT&T
or its securities, Subsidiaries or assets, such restrictions and obligations
shall terminate on the second anniversary of the consummation of the Spin-off.

          (c) To the extent the restrictions on and the obligations of DoCoMo
and its Standstill Affiliates under Sections 3.6(a), (b) and (c) relate to AT&T
or its securities, Subsidiaries or assets, then such restrictions and
obligations shall terminate if any of the following three events occurs, but
only if at such time the Spin-off shall not have occurred and the No Spin-off
Purchase Right shall have accrued to DoCoMo and DoCoMo shall have elected not to
exercise such right within the time period provided for in Section 4.4:

          (i)  a third party unaffiliated with AT&T commences a tender or
               exchange offer seeking to acquire 15% or more of AT&T's
               outstanding voting securities and AT&T does not (within 10
               Business Days following such commencement) publicly recommend
               that its shareholders not accept such offer;

          (ii) AT&T enters into a definitive agreement (or binding letter of
               intent) with a third party (or group of related parties) to
               effectuate a merger or consolidation with or sale of all or
               substantially all of its assets and properties to, any
               unaffiliated third party, unless immediately following such
               transaction the Persons that immediately prior to such
               transaction held the all of the classes of common stock of AT&T,
               taken as a whole,

                                      -23-
<PAGE>

               directly or indirectly, at least 50% of the equity and at least
               50% of the voting power of the entity surviving such merger or
               consolidation or to whom such assets will be transferred; or

         (iii) if AT&T enters into a definitive agreement (or binding letter of
               intent) providing for a sale by AT&T of AT&T securities, or a
               merger or consolidation, in either case that would result in any
               one Person (or group of related Persons) acquiring in excess of
               35% of the voting power of AT&T outstanding after completion of
               such transaction; provided that (x) if the acquiror of the
               greater-than 35% block is subject to a standstill that restricts
               its ability to acquire more than its initial percentage of the
               voting power of AT&T or to appoint a majority of its Board (and
               such standstill is otherwise on substantially similar terms as
               the provisions of Section 3.6 or, to the extent such other terms
               are not substantially similar to the provisions of Section 3.6,
               AT&T amends the provisions of Section 3.6 to make the provisions
               of Section 3.6 substantially similar to such terms of the other
               standstill), then the obligations set forth in Section 3.6 (as so
               amended, if applicable) shall not terminate by virtue of this
               clause (iii) unless and until the standstill restrictions on the
               acquiror lapse or are waived, and (y) anything in this clause
               (iii) notwithstanding, DoCoMo shall continue to be subject to
               each provision of Section 3.6 to the extent such provision
               relates to the ability of DoCoMo to support, encourage, cooperate
               with, participate with or act as a group or in concert with the
               greater-than-35% acquiror with respect to the securities of AT&T
               or AT&T's Board or management.

          (d) The termination provisions of this Section 3.7 shall be in
addition to any limitations on or termination of the obligations of Section 3.6
expressly provided for above, including pursuant to Section 3.6(c).

          Section 3.8 VOTING. (a) DoCoMo agrees to cause each share of AT&T
Wireless Stock Beneficially Owned by it that is entitled to vote in any election
for Directors to be present in person or represented by proxy at all meetings of
stockholders of AT&T or AT&T Wireless, as the case may be, at which Directors
are to be elected, so that all such shares shall be counted as present for
determining the presence of a quorum at such meetings.

          (b) DoCoMo agrees that at any meeting of the type referred to in
Section 3.8(a) it shall vote or cause to be voted all of the shares of AT&T
Wireless Stock Beneficially Owned by it that it is entitled to vote at such
meeting in accordance with one of the following (as determined by DoCoMo in its
sole discretion): (i) in favor of the slate of Directors nominated by the Board,
or (ii) for, against or abstain with respect to each nominee for Director in the
same proportion as the votes of all stockholders other than DoCoMo and its
Affiliates.

          (c) The provisions of Section 3.8(a) and (b) shall not apply at any
time that AT&T or AT&T Wireless, as the case may be, is not in compliance with
its obligations under Section 3.1 or following the occurrence of an Investor
Rights Termination Event.

                                      -24-
<PAGE>

                                   ARTICLE IV

                                 OTHER COVENANTS

          Section 4.1 TECHNOLOGY COMMITMENT. (a) AT&T (prior to consummation of
the Spin-off) and AT&T Wireless (after consummation of the Spin-off) agree that,
except as set forth below, the Wireless Group (prior to the Spin-off) or AT&T
Wireless (after the Spin-off) will have launched service based on W-CDMA
technology in 13 of the top 50 wireless markets in the United States (defined as
BTAs numbered 1 through 50 set forth on Schedule 4.1 hereto) by June 30, 2004.
Failure to achieve this target will be excused (i) if DoCoMo at any time ceases
to actively support and promote W-CDMA technology as the primary standard for
its delivery of wireless services based on 3G technology or if DoCoMo is no
longer actively supporting and promoting wireless services based on 3G
technology, (ii) if the failure is due to factors beyond AT&T's (prior to
consummation of the Spin-off) or AT&T Wireless's (after consummation of the
Spin-off) reasonable power to affect or control, including, without limitation,
delay in availability, or unavailability, of equipment, software, spectrum, cell
sites or other items needed for the construction and operation of the W-CDMA
service, PROVIDED that AT&T (prior to consummation of the Spin-off) or AT&T
Wireless (after the consummation of the Spin-off) shall have used commercially
reasonable efforts to take reasonable steps to acquire such equipment, software,
spectrum, cell sites or other items so needed, (iii) if AT&T (prior to
consummation of the Spin-off) or AT&T Wireless (after the consummation of the
Spin-off) is unable to obtain regulatory approvals, licenses and permits
necessary for the launch of services based on W-CDMA technology on a timely
basis and without the imposition of burdensome conditions or restrictions,
PROVIDED that AT&T (prior to consummation of the Spin-off) and AT&T Wireless
(after the consummation of the Spin-off) shall have used commercially reasonable
efforts to take reasonable steps to obtain such approvals, licenses and permits,
or (iv) if the Board determines in good faith that the Wireless Group's (prior
to consummation of the Spin-off) or AT&T Wireless's (after consummation of the
Spin-off) business plan for constructing such a system has deteriorated
significantly due to regulatory or legal changes, intellectual property
disputes, health, safety or other similar issues, or acts of God or other
natural events.

          (b) The Wireless Group or AT&T Wireless, as the case may be, agrees
not to abandon W-CDMA technology without the prior approval of the Board of AT&T
or AT&T Wireless, as the case may be.

          Section 4.2 JOINT RESEARCH AND DEVELOPMENT EFFORT. Within twelve
months of the Closing Date or such other date as the parties mutually agree
upon, AT&T, AT&T Wireless and DoCoMo will discuss in good faith joint research
and development efforts.

          Section 4.3 TECHNOLOGY DEFAULT RIGHT. (a) In the event that either (i)
the Board requires or approves a change in the Wireless Group's (prior to
consummation of the Spin-off) or AT&T Wireless's (after consummation of the
Spin-off) use of W-CDMA technology as the primary standard for its delivery of
wireless services based on 3G technology (other than migration to successor
technologies and other than for one or more of the reasons set forth in clauses
(i) through (iv) of Section 4.1(a)) prior to June 30, 2004, or (ii) if AT&T
Wireless fails to meet the technology commitment set forth in Section 4.1(a)
above (other than

                                      -25-
<PAGE>

for one or more of the reasons set forth in clauses (i) through (iv) of Section
4.1(a)), DoCoMo may require AT&T (if prior to the Spin-off) to repurchase (x)
the shares of New Tracking Stock originally issued to DoCoMo pursuant to the
Purchase Agreement or shares of Current Wireless Tracking Stock issued upon
conversion of such originally issued shares of New Tracking Stock and (y) the
Warrants issued to DoCoMo pursuant to the Warrant Agreement, in each of cases
(x) and (y) that have not been Transferred by DoCoMo (other than to a Designee
in accordance with Section 6.1(a) hereof), or to require AT&T Wireless (if after
the Spin-off) to repurchase (1) the shares of AT&T Wireless Common Stock that
were issued in exchange for the shares of Current Wireless Tracking Stock issued
upon conversion of shares of New Tracking Stock that were originally issued to
DoCoMo pursuant to the Purchase Agreement, and (2) the Warrants, in each of
cases (1) and (2) that have not been Transferred by DoCoMo (other than to a
Designee in accordance with Section 6.1(a) hereof) (the "TECHNOLOGY DEFAULT
RIGHT"); PROVIDED, HOWEVER, that the Technology Default Right will terminate,
and DoCoMo will not be entitled to require such repurchase, if DoCoMo, at any
time prior to delivery of the Technology Default Exercise Notice, ceases to
actively support and promote W-CDMA technology as the primary standard for its
delivery of wireless services based on 3G technology. AT&T or AT&T Wireless, as
the case may be, shall give written notice to DoCoMo promptly following any
Board action described in Section 4.3(a)(i).

          (b) The Technology Default Right will be exercisable only if notice of
exercise (the "TECHNOLOGY DEFAULT EXERCISE NOTICE") is given within 30 days of
written notice to DoCoMo of such Board action (in the case of clause (i) of
Section 4.3(a)) or by July 31, 2004 (in the case of clause (ii) of Section
4.3(a)).

          (c) The repurchase price with respect to the Technology Default Right
will be the Original Purchase Price of each Warrant and each share of New
Tracking Stock, Current Wireless Tracking Stock or AT&T Wireless Common Stock so
repurchased, in each case plus the Cost of Carry on the Original Purchase Price
from the Closing Date to the date of payment or, in the event AT&T or AT&T
Wireless exercises its rights under Section 4.3(e), to the date DoCoMo receives
the last of the proceeds from the sales contemplated thereunder necessary for
DoCoMo to have received the aggregate Technology Default Repurchase Price (the
"TECHNOLOGY DEFAULT REPURCHASE PRICE"). Subject to Section 4.3(e), the closing
of the repurchase by AT&T or AT&T Wireless, as the case may be, of New Tracking
Stock, Current Wireless Tracking Stock or AT&T Wireless Common Stock, as the
case may be, and Warrants pursuant to this Section 4.3 shall take place as
promptly as determined by AT&T or AT&T Wireless, as the case may be, to be
reasonably practicable (taking into account the availability of financing and
other considerations) following delivery of the Technology Default Exercise
Notice, but in any event no later than 9:00 A.M., New York time, on the first
Business Day that is four months after the Technology Default Exercise Notice is
deemed to have been duly given to AT&T (if prior to the Spin-off) or to AT&T
Wireless (if after the Spin-off), pursuant to Section 11.4 of this Agreement, or
at such other time and place as DoCoMo and AT&T or AT&T Wireless, as the case
may be, shall agree. At such closing, DoCoMo shall deliver to AT&T or AT&T
Wireless, as the case may be, certificates representing the securities and
warrants to be sold by it and AT&T or AT&T Wireless, as the case may be, shall
transfer to DoCoMo the aggregate Technology Default Repurchase Price in United
States dollars by wire transfer of immediately available funds to an account
designated by DoCoMo (which designation shall be made not less than two Business
Days prior to such closing). Subject to Section 4.3(e), upon valid exercise by

                                      -26-
<PAGE>

DoCoMo of the Technology Default Right hereunder, AT&T or AT&T Wireless, as the
case may be, and DoCoMo shall be legally obligated to consummate the purchase
contemplated thereby within the time period required and shall use their
reasonable efforts to secure any approvals required, and to comply with all
Federal, state and Japanese and other foreign laws and regulations and
securities exchange listing requirements applicable, in connection therewith as
soon as practicable.

          (d) Upon exercise of the Technology Default Right hereunder, DoCoMo
shall cease to be entitled to any veto, Board representation, management
representation or other governance or management rights that it may have
hereunder (including without limitation under Sections 3.1, 3.2, 3.3, 3.4, 3.5
and 5.4 hereof) or under any of the Related Agreements, and DoCoMo will cause
the resignation of any of its appointees, nominees or representatives and
managers (including without limitation under Sections 3.1, 3.2, 3.3, 3.4, 3.5
and 5.4 hereof) to occur within five Business Days following the exercise of
such rights, and no DoCoMo appointee, nominee or designee will vote or exercise
any other rights or powers of office during such five Business Day period;
PROVIDED, HOWEVER, that until payment of the Technology Default Repurchase Price
(or satisfaction of the alternative obligation set forth in Section 4.3(e)), and
so long as DoCoMo would otherwise be entitled to Board representation under
Section 3.1 hereof, DoCoMo shall be entitled to designate one individual to
serve on the AT&T Board (if prior to the Spin-off) or the AT&T Wireless Board
(if after the Spin-off) reasonably acceptable to AT&T or AT&T Wireless, for the
purpose of monitoring AT&T's or AT&T Wireless's compliance with the repurchase
obligations set forth in this Section 4.3, which individual shall be
unaffiliated with DoCoMo and shall agree not to provide DoCoMo or its Affiliates
with any confidential information of AT&T or AT&T Wireless other than
information directly related to AT&T's or AT&T Wireless's compliance with such
repurchase obligations; and PROVIDED FURTHER, that until payment of the
Technology Default Repurchase Price (or satisfaction of the alternative
obligation set forth in Section 4.3(e)), nothing herein shall impair DoCoMo's
rights as a stockholder of AT&T or AT&T Wireless, as the case may be.

          (e) In lieu of paying all or part of the Technology Default Repurchase
Price, AT&T or AT&T Wireless, as the case may be, will have the right to cause
DoCoMo to sell all or part of its shares of Current Wireless Tracking Stock
(issuable upon conversion of the New Tracking Stock or exercise of the Warrants)
or AT&T Wireless Common Stock (including shares issuable upon exercise of the
Warrants) into the market (upon registrations in accordance with the
registration rights procedures set forth in Article VII), subject to AT&T
Wireless paying DoCoMo the amount by which the proceeds received by DoCoMo (net
of underwriting commissions and discounts) in such sale or sales are less than
the aggregate Technology Default Repurchase Price with respect to all shares so
sold by DoCoMo. In connection with the exercise of such right, AT&T or AT&T
Wireless, as the case may be, shall have the right to cause DoCoMo to convert
any shares of New Tracking Stock into shares of Current Wireless Tracking Stock,
and the right to cause DoCoMo to exercise any Warrants that are in the money and
to convert any shares of New Tracking Stock received upon such exercise into
shares of Current Wireless Tracking Stock. In the event that AT&T or AT&T
Wireless, as the case may be, elects to cause DoCoMo to exercise any Warrants in
order for AT&T or AT&T Wireless to cause the sale of the Underlying Stock, then
AT&T Wireless shall make such provisions as are necessary so that any required
exercise of Warrants pursuant to the immediately preceding sentence will be done
on a "cashless" basis, such that, upon exercise of such Warrants, DoCoMo shall
be deemed

                                      -27-
<PAGE>

to have surrendered a number of shares of Underlying Stock (as defined in the
Warrant Agreement) having an aggregate Current Market Price (as defined in the
Warrant Agreement, but substituting five days for the 20-day period referred to
therein) equal to the aggregate exercise price payable with respect to all of
the exercised Warrants, and DoCoMo shall receive in respect of such Warrants a
number of shares of Underlying Stock equal to the difference between the total
number of shares subject to such exercised Warrants less the number of such
shares deemed to have been so surrendered, and AT&T and AT&T Wireless shall be
deemed to have agreed to repurchase such surrendered Warrants pursuant to
Section 4.3(c). The size and timing of such registered sales will be determined
mutually by AT&T or AT&T Wireless, as the case may be, and DoCoMo in their good
faith judgment, in consultation with their underwriters and taking into account
DoCoMo's desire to sell its shares as quickly as reasonably practicable and
AT&T's or AT&T Wireless's desire not to disrupt or depress the market for
Current Wireless Tracking Stock or AT&T Wireless Common Stock. Such sales will
be completed as promptly as reasonably practicable, but if such sales are not
completed within 10 months of the date the Technology Default Exercise Notice is
deemed to have been duly given pursuant to Section 11.4, AT&T or AT&T Wireless,
as the case may be, will promptly (but in any event within 10 days after such
10-month anniversary) repurchase from DoCoMo, and DoCoMo shall agree to sell to
AT&T or AT&T Wireless, as the case may be, any shares of AT&T Wireless Stock and
unexercised Warrants that were subject to the Technology Default Right and that
were not previously repurchased pursuant to Section 4.3(c) or sold in the
registered offerings contemplated by this Section 4.3(e) for an aggregate
purchase price equal to the difference between the (A) aggregate Technology
Default Repurchase Price that AT&T or AT&T Wireless, as the case may be, would
have been obligated to pay to DoCoMo pursuant to Section 4.3(c) if AT&T or AT&T
Wireless, as the case may be, had not exercised its rights under this Section
4.3(e) to cause DoCoMo to sell shares in registered sales (assuming, for
purposes of determining the amount of Cost of Carry thereon, that AT&T or AT&T
Wireless, as the case may be, would have made payments to DoCoMo at the times
DoCoMo received proceeds from such registered sales) and (B) the aggregate
proceeds received by DoCoMo (net of underwriting commissions and discounts) in
the registered sales or previously received pursuant to Section 4.3(c). Except
as provided in the immediately preceding sentence, such repurchases shall be
made in accordance with the last two sentences of Section 4.3(c). In connection
with any underwritten sales pursuant to this Section 4.3(e), AT&T or AT&T
Wireless, as the case may be, and DoCoMo shall enter into a customary
underwriting agreement as contemplated by Article VII hereof no later than
immediately prior to the effectiveness of the registration of the shares to be
sold.

          (f) AT&T hereby irrevocably guarantees and promises to pay AT&T
Wireless's obligations pursuant to this Section 4.3 up to a maximum of $3.65
billion plus the Cost of Carry thereon to the date of payment by AT&T; PROVIDED
that AT&T will not be obligated to make any payment under this guarantee unless
AT&T Wireless fails to make a payment that it is obligated to make pursuant to
this Section 4.3; PROVIDED, FURTHER, that in the event there is a dispute as to
AT&T Wireless's obligation to make all or any portion of any payment pursuant to
this Section 4.3, AT&T will not be obligated to make such payment under this
guarantee unless and until such dispute is resolved in favor of DoCoMo by a
final and nonappealable order and AT&T Wireless thereafter fails to make such
payment; and PROVIDED, FURTHER, that in any event DoCoMo shall have used
commercially reasonable efforts to first collect payment from AT&T Wireless. In
the event AT&T makes any payment to DoCoMo

                                      -28-
<PAGE>

pursuant to this guarantee, AT&T Wireless shall be obligated to reimburse and
indemnify AT&T for such payment (including any costs incurred by AT&T). AT&T
hereby agrees that any liability or obligation AT&T Wireless may have to AT&T as
a result of the immediately preceding sentence is hereby subordinated and made
junior to all obligations and liabilities of AT&T Wireless to DoCoMo under this
Section 4.3 and that AT&T will not receive or retain any payments with respect
to AT&T Wireless's liabilities or obligations as a result of the immediately
preceding sentence until the prior indefeasible payment in full of AT&T
Wireless's obligations to DoCoMo under this Section 4.3.

          (g) The parties agree and acknowledge that exercise of the Technology
Default Right shall be DoCoMo's sole remedy in the event that the technology
commitment set forth in Section 4.1 is not met, and DoCoMo agrees not to pursue
any other remedy at law or in equity (it being understood that nothing in this
paragraph (g) shall impair any rights that DoCoMo might have with respect to the
breach of any provision of this Agreement to the extent not related to
implementation of technology or deployment of operating assets or services).

          Section 4.4 NO SPIN-OFF REPURCHASE RIGHT. (a) In the event that AT&T
has not consummated the Spin-off on or prior to January 1, 2002 (or, at AT&T's
election, on or prior to March 15, 2002, which election shall be made in writing
to DoCoMo not later than December 15, 2001, in the event AT&T has not received a
satisfactory tax ruling with respect to the Spin-off as of the date of such
election but reasonably believes as of such date that it is possible to obtain
such a ruling by, or effect the Spin-off without a ruling by, March 15, 2002,
and is continuing in good faith to seek such a ruling or to effect the Spin-off
without a ruling), DoCoMo will have the right, at its election (the "NO SPIN-OFF
RIGHT"), to require AT&T to:

          (i)  repurchase from DoCoMo (x) the New Tracking Stock initially
               issued to DoCoMo pursuant to the Purchase Agreement or the shares
               of Current Wireless Tracking Stock issued upon conversion of such
               shares of New Tracking Stock and (y) the Warrants issued to
               DoCoMo pursuant to the Warrant Agreement and in each case that
               have not been Transferred by DoCoMo (other than to any Designee
               in accordance with Section 6.1(a) hereof), at the Original
               Purchase Price of each Warrant and each share of New Tracking
               Stock or Current Wireless Tracking Stock so repurchased, in each
               case plus the Cost of Carry thereon from the Closing Date to the
               date of payment (the "NO SPIN-OFF REPURCHASE PRICE"); or

          (ii) enable DoCoMo to sell shares of Current Wireless Tracking Stock
               issuable upon conversion of such shares of New Tracking Stock and
               exercise of such Warrants, by registering the sale of such shares
               of Current Wireless Tracking Stock through registrations in
               accordance with the registration rights procedures set forth in
               Article VII.

          (b) The No Spin-off Right will be exercisable only if DoCoMo provides
AT&T with written notice thereof within 30 days following January 1, 2002 or
March 15, 2002, whichever is the applicable date for triggering the No Spin-off
Right.

                                      -29-
<PAGE>

          (c) In the event DoCoMo makes the election set forth in clause (i) of
Section 4.4(a), the closing of the repurchase by AT&T of (i) the New Tracking
Stock or Current Wireless Tracking Stock and (ii) Warrants contemplated thereby
shall take place no later than 9:00 A.M., New York time, on April 15, 2002 (if
the applicable triggering date is January 1, 2002), or as soon as reasonably
practicable but no later than June 15, 2002 (if the applicable triggering date
is March 15, 2002), at the offices of AT&T as indicated in Section 11.4 of this
Agreement, or at such other time and place as DoCoMo and AT&T shall agree. At
such closing, DoCoMo shall deliver to AT&T certificates representing the New
Tracking Stock or Current Wireless Tracking Stock and Warrants to be sold by it
and AT&T shall transfer to DoCoMo the aggregate No Spin-off Repurchase Price in
United States dollars by wire transfer of immediately available funds to an
account designated by DoCoMo (which designation shall be made not less than two
Business Days prior to such closing). Upon valid exercise by DoCoMo of the
election set forth in clause (i) of Section 4.4(a), AT&T and DoCoMo shall be
legally obligated to consummate the purchase contemplated thereby within the
time period required and shall use their reasonable efforts to secure any
approvals required, and to comply with all Federal, state and Japanese and other
foreign laws and regulations and securities exchange listing requirements
applicable, in connection therewith as soon as practicable.

          (d) In the event DoCoMo makes the election set forth in clause (ii) of
Section 4.4(a), the size and timing of such registered sales will be determined
mutually by AT&T and DoCoMo in their good faith judgment, in consultation with
their underwriters and taking into account DoCoMo's desire to sell its shares as
quickly as reasonably practicable and AT&T's desire not to disrupt or depress
the market for Current Wireless Tracking Stock. In connection with any
underwritten sales pursuant to this Section 4.4, AT&T and DoCoMo shall enter
into a customary underwriting agreement as contemplated by Article VII hereof no
later than immediately prior to the effectiveness of the registration of the
shares to be sold.

          (e) AT&T agrees to use its commercially reasonable efforts to obtain a
satisfactory tax ruling with respect to the Spin-off.

          Section 4.5 REINVESTMENT RIGHT. (a) In the event AT&T redeems the New
Tracking Stock under the circumstances referred to in Section 5(a) or 5(b) of
the Certificate of Amendment (a "PERMITTED REDEMPTION"), and within one year of
such Permitted Redemption AT&T completes a spin-off to its shareholders, by way
of dividend distribution or similar pro rata distribution to the holders of
common stock of AT&T, of all or substantially all of the businesses that
currently constitute the businesses of the Wireless Group (a "POST-REDEMPTION
SPIN-OFF"), then DoCoMo shall have the right to invest in and acquire, and AT&T
shall provide DoCoMo with such right to invest in and acquire shares of such
spun-off entity ("SPINCO"), as follows:

          (i)  If AT&T intends to effect a Post-Redemption Spin-off within one
               year of a Permitted Redemption, it shall provide DoCoMo with not
               less than 90 days' notice of the earliest expected date for
               consummation of such Post-Redemption Spin-off.

          (ii) If DoCoMo desires to exercise its rights under this Section
               4.5(a), then not later than 90 days prior to the earliest
               expected date for consummation of

                                      -30-
<PAGE>

               the Post-Redemption Spin-off as set forth in such notice (or, if
               AT&T has not provided at least 120 days' advance notice of the
               earliest expected consummation date, within 30 days of receipt by
               DoCoMo of notice from AT&T of the earliest expected consummation
               date), DoCoMo shall deliver to AT&T a notice stating that DoCoMo
               desires to exercise its rights under this Section 4.5(a). DoCoMo
               may withdraw such notice of exercise only if the actual
               consummation is delayed more than 120 days beyond the earliest
               expected consummation date set forth in the notice referred to in
               clause (i).

          (iii)Unless DoCoMo's notice of exercise has been withdrawn in
               accordance with clause (ii), concurrently with (or, at AT&T's
               election, immediately prior to) the consummation of the
               Post-Redemption Spin-off, (A) DoCoMo shall purchase a number of
               shares of common stock of SpinCo (the "ACQUIRED SPINCO SHARES")
               equal to (1) the Economic Interest Percentage that would be
               represented as of immediately prior to the Permitted Redemption
               solely by the shares of New Tracking Stock redeemed in such
               Permitted Redemption multiplied by (2) the number of shares of
               SpinCo common stock that would be outstanding on a Fully Diluted
               Basis immediately after the Post-Redemption Spin-off and after
               giving effect to the issuance of the Acquired SpinCo Shares, (B)
               the aggregate purchase price for such Acquired SpinCo Shares
               shall be equal to the aggregate amount received by DoCoMo in
               respect of its New Tracking Stock in the Permitted Redemption,
               (C) if DoCoMo held any Warrants that were redeemed concurrently
               with such Permitted Redemption as contemplated by Section 6.1 of
               the Warrant Agreement, then DoCoMo shall be entitled to purchase
               warrants (the "ACQUIRED SPINCO WARRANTS") to purchase a number of
               shares SpinCo common stock (the "SPINCO WARRANT NUMBER")
               determined by multiplying (1) the Warrant Percentage by (2) the
               number of shares of SpinCo common stock that would be outstanding
               on a Fully Diluted Basis immediately after the Post-Redemption
               Spin-off and after giving effect to the issuance of the Acquired
               SpinCo Shares and the exercise of the Acquired SpinCo Warrants,
               at an exercise price per share of SpinCo common stock equal to
               the aggregate exercise price of all of the Warrants held by
               DoCoMo that were redeemed concurrently with the Permitted
               Redemption divided by the SpinCo Warrant Number, (D) the
               aggregate purchase price for such Acquired SpinCo Warrants shall
               be equal to the aggregate amount received by DoCoMo in respect of
               its Warrants that were redeemed concurrently with the Permitted
               Redemption, and (E) DoCoMo, SpinCo and/or AT&T shall enter into
               an investor agreement, warrant agreement and such other
               agreements as may be necessary and appropriate such that the
               terms and conditions of DoCoMo's investment in SpinCo are, as
               nearly as possible, comparable to the terms and conditions of the
               Investment and the Alliance as set forth in this Agreement and
               the Related Agreements. For purposes of the foregoing, the
               "WARRANT PERCENTAGE" shall mean the Economic Interest Percentage
               that would be represented as

                                      -31-
<PAGE>

               of immediately prior to the Permitted Redemption solely by the
               shares of New Tracking Stock issuable upon exercise of any
               Warrants held by DoCoMo that were redeemed in such Permitted
               Redemption, if such Warrants had been exercised immediately prior
               to the Permitted Redemption.

          (iv) The aggregate purchase price payable pursuant to clause (iii)
               above shall be paid to AT&T at the closing of such purchase in
               United States dollars by wire transfer of immediately available
               funds to an account designated by AT&T (which designation shall
               be made not less than two Business Days prior to such closing).
               AT&T agrees that if AT&T Wireless paid any portion of the
               redemption price paid to DoCoMo and its Subsidiaries in
               connection with any Permitted Redemption, then at the closing of
               the purchase referred to in the previous sentence, AT&T shall
               contribute to SpinCo a portion of the purchase price paid in
               respect of such purchase equal to the portion of the redemption
               price paid by AT&T Wireless.

          (b) In the event that AT&T redeems the New Tracking Stock in a
Permitted Redemption pursuant to Section 5(b) of the Certificate of Amendment
and, within one year of such Permitted Redemption, AT&T announces that it has
entered into a binding agreement to sell (a "POST-REDEMPTION SALE") all or
substantially all of the businesses that currently constitute the businesses of
the Wireless Group (the "SOLD BUSINESSES"), then, upon consummation of such
Post-Redemption Sale, AT&T shall pay or deliver to DoCoMo the excess, if any, of
(i) the product of (A) DoCoMo's Economic Interest Percentage immediately prior
to such Permitted Redemption (assuming exercise of all Warrants held by DoCoMo
that were redeemed in such Permitted Redemption) and (B) the net proceeds to
AT&T from the Post-Redemption Sale, over (ii) the sum of (A) the aggregate
proceeds received by DoCoMo in respect of the Permitted Redemption of its New
Tracking Stock and the concurrent redemption of any Warrants held by DoCoMo plus
(B) the aggregate exercise price that would have been payable upon exercise of
such Warrants. The form of consideration AT&T shall use to satisfy its
obligation pursuant to the immediately preceding sentence shall be the same form
of consideration (or same mix if a mix of consideration is received) received by
AT&T in the Post-Redemption Sale. The foregoing notwithstanding, DoCoMo may
elect to have such payment, if any, calculated without regard to the Warrants,
in which event all references to the Warrants in the foregoing calculation shall
be disregarded. AT&T shall make such payment to DoCoMo, if any, not later than
10 Business Days following the consummation of the Post-Redemption Sale, such
payment to be made in United States dollars by wire transfer of immediately
available funds to an account designated by DoCoMo (which designation shall be
made not less than two Business Days prior to the date such payment is due).

          Section 4.6 FINANCIAL STATEMENT COOPERATION. AT&T (prior to the
Spin-off) and AT&T Wireless (after the Spin-off) agree to use all reasonable
efforts to provide DoCoMo with such financial information as it may reasonably
request from time to time, as may be necessary in order for DoCoMo to prepare
such consolidated financial reports as it is required to prepare under
applicable law; PROVIDED that to the extent any of such information is
non-public information, (i) such non-public information shall be disclosed
pursuant to customary confidentiality restrictions that (A) limit dissemination
of such information to those employees

                                      -32-
<PAGE>

and agents of DoCoMo and its Subsidiaries having a need to know in connection
with the preparation of such consolidated financial reports, (B) prohibit public
disclosure of such non-public information and (C) prohibit inclusion of such
information in any portion of the consolidated financial statements that become
publicly disclosed, in each case prior to the time any such information is
publicly disclosed by AT&T or AT&T Wireless, as the case may be, and (ii) DoCoMo
agrees to use all reasonable efforts to prevent such non-public information from
becoming disclosed or disseminated prior to the time any such information is
publicly disclosed by AT&T or AT&T Wireless, as the case may be, other than to
those having a need to know in connection with the preparation of such
consolidated financial reports.

                                   ARTICLE V

                           MOBILE MULTIMEDIA ALLIANCE

          Section 5.1 THE MOBILE MULTIMEDIA ALLIANCE AND THE MMS. (a) As soon as
practicable after the Closing, DoCoMo and AT&T Wireless (the "ALLIANCE
PARTNERS") shall form a mobile multimedia alliance (the "ALLIANCE") on the terms
and conditions described in this Article V, having the goals described in
Section 5.1(b). Pursuant to the Alliance, each of the Alliance Partners shall
cooperate in operational and technological matters affecting the delivery of
i-mode mobile multimedia services to subscribers, as well as the development and
delivery of i-mode mobile multimedia content and applications.

          (b) The Alliance will have the following goals: (i) to develop
wireless internet access and related mobile multimedia applications and services
from wireless phones and other wireless access devices based on DoCoMo's i-mode
and multimedia expertise, experience, know-how and technology; (ii) to achieve
synergies with AT&T Wireless' mobility division, including to develop and
provide advanced data and multimedia services offerings that create and enhance
customer loyalty and create new revenue sources for AT&T Wireless; and (iii) to
accelerate the growth of each Alliance Partner's existing mobile multimedia and
data service businesses by utilizing each other's current and future technology,
experience and know-how in their respective Home Territories.

          (c) As soon as practicable following the Closing (and with the
Alliance Partners using commercially reasonable efforts to do so within three
months of Closing), AT&T Wireless shall form a wholly owned subsidiary (which
subsidiary may be a limited liability company, corporation or other entity),
which will be wholly owned and controlled (directly or indirectly) by AT&T
Wireless (such entity is referred to herein as the "MMS"). The MMS will be
responsible for the development and commercialization of i-mode mobile
multimedia content and applications over the AT&T Wireless network in the AT&T
Wireless Home Territory.

          Section 5.2 TECHNOLOGY EVOLUTION AND TIMING. (a) The Alliance Partners
each shall use commercially reasonable efforts to jointly: (i) seek to enable
users to access diverse HTML and x-HTML applications and content on mobile
wireless terminals, and (ii) encourage terminal manufacturers to produce a
variety of attractive and economical devices that are compatible with the
following technology path:

                                      -33-
<PAGE>

          HDML/WML-->cHTML (as commercially reasonable in the United
          States)-->xHTML/WAP-NG

          (b) As an interim step toward the development of xHTML/WAP-NG, and in
furtherance of the goals set forth in Section 5.1(b) and Section 5.2(a), the
Alliance Partners shall jointly approach terminal manufacturers concerning the
development, production and marketing of dual browser handsets, and shall work
jointly with such manufacturers with respect to functions, specification and
design for such handsets.

          (c) The Alliance Partners shall use commercially reasonable efforts to
adopt 3G technology paths that target convergence upon worldwide standards for
data and air interface protocols (i.e., WAP-NG and W-CDMA).

          (d) As soon as practicable following the Closing, the Alliance
Partners jointly shall (i) commence study on DoCoMo's service platform elements
that may be of benefit to the MMS, including, but not limited to, profiling
engines, data warehouses and clickstream analysis and (ii) study the feasibility
of accelerating the delivery to market of advanced devices and related
technologies that can increase the growth and performance of AT&T Wireless and
the MMS. The Alliance Partners acknowledge and agree that any business plan
resulting from these studies, including the Business Plan referred to in Section
5.5 below, should be efficient and have a benefit/cost relationship that is
positive in terms of economics and market position for AT&T Wireless.

          Section 5.3 CONTRIBUTIONS AND RESOURCES. (a) AT&T Wireless shall
contribute the following to the MMS:

          (i)  Multimedia resources:

               (A) PocketNet service, experience and personnel;
               (B) rights to current content, commerce and applications; and
               (C) gateway, email and related application servers.

          (ii) AT&T Wireless agrees that it will earmark an amount of cash
               sufficient to fund the business plan of the MMS (as described in
               Section 5.5 below), until such time as the business is cash flow
               positive; PROVIDED, HOWEVER, that AT&T Wireless shall not be
               required to make available to the MMS in excess of $200 million.

          (b) DoCoMo shall, among other things, assist AT&T Wireless and the MMS
in achieving the goals set forth in Sections 5.1 and 5.2 hereof by providing the
MMS with information exchange opportunities and access to technology, know-how
and resources, including support in the categories outlined in Schedule 5.3(b)
hereto. Such contributions shall include, without limitation:

          (i)  the exclusivity and noncompete provisions set forth in Article X;

          (ii) the items and support described in Schedule 5.3(b) hereof;

                                      -34-
<PAGE>

          (iii) handset specifications and development expertise and influence;

          (iv) standardization influence;

          (v)  i-mode experience, such as negotiations with content providers;
               and

          (vi) licenses to all DoCoMo know-how, technology and intellectual
               property rights related to i-mode mobile multimedia services (up
               to and including 3G) as it is developed; sole use of the i-mode
               brand in the USA, and other know-how developed for mobile
               multimedia services. It is understood, for purposes of
               clarification, that "i-mode mobile multimedia technology (up to
               and including 3G)" as used herein includes mobile Internet
               gateway designs, and user interface designs, but does not include
               technology which solely relates to 3G network architecture and
               infrastructure, which will be subject to separate negotiations
               based upon commercially reasonable licensing terms and
               conditions. Such licenses shall be subject to that certain letter
               agreement, dated November 30, 2000, by and among DoCoMo, AT&T and
               AT&T Wireless.

Although, with respect to the contributions and licenses made or granted by
DoCoMo under this Section 5.3(b) and in particular with respect to 5.3(b)(ii)
and (vi), DoCoMo agrees to provide these contributions and licenses based on and
including all of its rights (now held or later acquired) to such contributions
and licenses in Japan and, if any, in the Home Territory of AT&T Wireless,
DoCoMo does not make any representation or warranty as to whether such rights,
experience, know-how and technology can be lawfully used in the Home Territory
of AT&T Wireless in the same manner as used in Japan, or at all. DoCoMo does
represent and warrant, however, that, at the time of the execution of this
Agreement, to the actual knowledge of the Executive Manager of the Intellectual
Property Department of DoCoMo (upon reasonable inquiry of persons reporting to
him), there are no third-party rights or claims that would render the use of the
contributions or licenses by AT&T Wireless in its Home Territory unlawful or
infringing, or actual knowledge of any limitations on the use of these
contributions and licenses in the Home Territory of AT&T Wireless, except as
disclosed in that certain letter pertaining to this paragraph sent by DoCoMo to
AT&T Wireless on the date of this Agreement. Accordingly, DoCoMo shall not be
responsible to AT&T Wireless, other than for breach of the representations and
warranties in the immediately preceding sentence, for any damages that may arise
in connection with the use of these contributions and licenses by AT&T Wireless
in its Home Territory. DoCoMo shall make all commercially reasonable efforts as
AT&T may reasonably request from time to time to assist AT&T Wireless in
obtaining for AT&T Wireless the right to use or exploit these contributions and
licenses in its Home Territory.

          (c) Subject to mutual agreement by AT&T Wireless and DoCoMo based on
the needs of the MMS and resource availability, DoCoMo shall second to AT&T
Wireless such employees as may be mutually beneficial for the free exchange of
information. The Alliance Partners anticipate that DoCoMo will provide
approximately two to three employees for the initial two years following the
Closing, approximately three to five employees during the period of AT&T
Wireless's deployment of 3G technology, and two to three employees thereafter.
The ultimate number of employees of DoCoMo seconded each year shall be
determined by the

                                      -35-
<PAGE>

Advisory Committee. DoCoMo will also accept up to two employees from AT&T
Wireless to work in Tokyo with DoCoMo's gateway, mobile multimedia or other
appropriate division in the Tokyo region. DoCoMo will credit $1 million per year
to cover the cost of DoCoMo secondees to AT&T Wireless, and the Alliance
Partners have agreed to discuss whether such amount would also cover AT&T
Wireless employees exchanged to DoCoMo. The Alliance Partners also agree to use
commercially reasonable efforts to set up regular meetings to facilitate
transfer of know-how. The qualifications of DoCoMo personnel available for
secondment will be provided to AT&T Wireless for consideration as opportunities
arise for placement within the MMS.

          (d) Neither DoCoMo nor, except as specifically set forth in Section
5.3(a)(ii), AT&T Wireless shall have any obligation to fund losses of the MMS,
and except as set forth in this Section 5.3, no Person shall have any obligation
to make any contribution to the MMS. The foregoing notwithstanding, AT&T
Wireless and, prior to the Spin-off, AT&T, shall be entitled to any tax benefits
attributable to losses of the MMS.

          Section 5.4 ADVISORY COMMITTEE AND SENIOR MANAGEMENT. (a) As soon as
practicable after the Closing, AT&T Wireless shall appoint an interim Chief
Executive Officer of the MMS (the "MMS CEO"), following consultation with
DoCoMo, to oversee and manage the initial activities of the MMS, or to manage
the MMS during any periods in which the office of MMS CEO is vacant. DoCoMo and
AT&T Wireless will use their commercially reasonable efforts to select and
appoint a mutually satisfactory permanent MMS CEO within six months after the
Closing or within six months of the creation of any vacancy. The MMS CEO shall
be a person with extensive experience and background with data related services
or similar skills in the United States and be sufficiently familiar with United
States markets. The MMS CEO, as MMS CEO, shall be an employee of AT&T Wireless
(or one of its subsidiaries) and work in the headquarters of AT&T Wireless or
such other location as may be determined for the primary offices of the MMS.

          (b) As soon as practicable after the Closing, AT&T Wireless and DoCoMo
shall establish a management advisory committee (the "ADVISORY COMMITTEE") to
assist and advise the MMS CEO. The Advisory Committee will, among other things,
assist and advise the MMS CEO in reviewing and updating the business plan and
strategy of the MMS. The Alliance Partners anticipate that the Advisory
Committee will meet on a regular basis or as requested by the MMS CEO. The
composition and size of the Advisory Committee will be mutually agreed upon by
the Alliance Partners, it being understood and agreed that DoCoMo will have
significant, but not majority, representation on the Advisory Committee.

          (c) DoCoMo shall have the right to appoint the Chief Technology
Officer of the MMS, subject to the approval of AT&T Wireless.

          Section 5.5 BUSINESS PLAN. (a) As soon as practicable following the
Closing, AT&T Wireless, in consultation with DoCoMo, shall prepare a business
strategy and plan (the "BUSINESS PLAN") for the first 18 months of operations of
the MMS. The Business Plan will be updated as appropriate in light of changing
business dynamics and business needs.

                                      -36-
<PAGE>

          (b) Subject to the Business Plan in effect from time to time, it is
anticipated that the MMS will have responsibility for AT&T Wireless's mobile
multimedia business, such as:

          (i)  mobile Internet server operation;

          (ii) application/service deployment, including streaming of music and
               video and e-commerce applications;

          (iii) negotiations with content providers;

          (iv) terminal functions planning, design and specifications in
               conjunction with AT&T Wireless's mobile services division;

          (v)  development of operational and technical standards in conjunction
               with AT&T Wireless's mobile services division; and

          (vi) brand development for the MMS.

          Section 5.6 TERMINATION. (a) All obligations of the Alliance Partners
set forth in this Article V may be terminated upon delivery of written notice in
accordance with Section 11.4 hereof by either Alliance Partner following the
occurrence of an Investor Rights Termination Event, except that (i) all DoCoMo
technology and intellectual property rights licenses shall continue for 18
months after delivery of such notice by either Alliance Partner and (ii)
termination of any agreements entered into pursuant to Section 5.7 hereof shall
be pursuant to the terms of those agreements.

          (b) In the event that an Investor Rights Termination Event has
occurred as a result of the exercise by DoCoMo of its Technology Default Right
or No Spin-off Right, or as a result of a Permitted Redemption, all obligations
of the Alliance Partners with respect to this Article V will terminate at the
end of the 90 day period giving rise to the Investor Rights Termination Event.

          (c) In the event that DoCoMo ceases to provide access to licenses on
the basis and as described in Section 5.3(b)(vi) and pursuant to that certain
letter dated November 30, 2000 relating to the licensing of such technology,
AT&T Wireless may, without limitation of any other remedies that may be
available, terminate all obligations of the Alliance Partners with respect to
the Alliance.

          Section 5.7 OTHER OPERATIONAL COOPERATION. (a) DoCoMo and AT&T
Wireless shall negotiate in good faith and use reasonable efforts to enter into
separate definitive agreements memorializing the principles set forth in this
Section 5.7(a). DoCoMo and AT&T Wireless will each recognize the other party as
its primary and preferred operating partner for mobile wireless services in the
other party's Home Territory. Specific areas of operational cooperation by
DoCoMo and AT&T Wireless will include:

          (i)  ROAMING. DoCoMo and AT&T Wireless will, subject to technical and
               commercial feasibility, each recognize the other party as its
               primary and

                                      -37-
<PAGE>

               preferred roaming partner in the other party's Home Territory
               service area, subject to both parties' existing roaming
               arrangements and agreements as of November 30, 2000. Nothing
               contained herein shall provide either party with any rights that
               would conflict with such existing roaming agreements for so long
               as such existing roaming agreements remain in effect. DoCoMo and
               AT&T Wireless shall use commercially reasonable efforts to
               negotiate in good faith roaming arrangements with each other on
               reciprocal terms no less favorable than those provided to similar
               wireless providers; provided that such arrangements shall not in
               any way conflict with either party's existing roaming agreements.
               Each party acknowledges that there may be substantial technical
               and other obstacles to achieving such roaming arrangements and
               each party agrees to take commercially reasonable steps, if any
               such exist, to overcome such obstacles; PROVIDED that no party
               shall be required to take any such steps that, from an
               economic perspective, would not be commercially reasonable.
               Nothing contained herein shall be deemed to create any obligation
               of exclusivity between DoCoMo and AT&T Wireless with respect to
               their roaming agreements in each other's Home Territory.

          (ii) JOINT-MARKETING PROGRAMS AND OFFERS. DoCoMo and AT&T Wireless
               will use commercially reasonable efforts to cooperate in
               designing, to the extent commercially feasible, programs and
               offers that market and provide mobile wireless services that are
               intended to extend from one party's Home Territory into the other
               party's Home Territory. The sharing of customer information will
               be subject to such limitations as may be imposed by applicable
               law and regulation.

         (iii) MAJOR ACCOUNT SERVICES. DoCoMo and AT&T Wireless will both
               participate, to the extent commercially feasible, in programs
               that will enable each to provide differentiated services to major
               customers with global mobile wireless telecommunication needs in
               the United States and Japan. Such programs will include AT&T
               Wireless's Worldview program, which allows large business
               customers to receive monthly consolidated reports covering
               wireless usage in relevant territories.

                                   ARTICLE VI

                              TRANSFER RESTRICTIONS

          Section 6.1 TRANSFER RESTRICTIONS. (a) Without the prior written
consent of AT&T Wireless, DoCoMo will not Transfer (i) any shares of New
Tracking Stock and (ii) for a period of eighteen months following the Closing
Date (except as otherwise provided below), any shares of Current Wireless
Tracking Stock, AT&T Wireless Common Stock or Warrants, except Transfers by
DoCoMo to any directly or indirectly wholly owned Subsidiary of DoCoMo (each
such transferee, a "DESIGNEE"); PROVIDED that prior to such Transfer such
Designee agrees in writing with AT&T Wireless to itself be bound by all the
provisions of this Agreement as if such transferee were DoCoMo. Nothing in this
Section 6.1(a) shall limit DoCoMo's right to make

                                      -38-

<PAGE>

Transfers in accordance with and to the extent provided in Sections 4.3 and 4.4
hereof. In the event that during the initial 18-month period any such transferee
that is a directly or indirectly wholly owned Subsidiary of DoCoMo ceases to be
a directly or indirectly wholly owned Subsidiary, then any prior Transfer to
such Subsidiary shall immediately become null and void and ownership and title
to any securities previously Transferred to such Subsidiary shall revert to
DoCoMo.

          (b) The foregoing notwithstanding, DoCoMo may Transfer shares of
Current Wireless Tracking Stock, AT&T Wireless Common Stock or Warrants without
AT&T Wireless's prior written consent prior to the expiration of 18 months
following the Closing Date, subject to the other provisions of this Section 6.1,
upon the occurrence of either of the following events: (1) a sale of all or
substantially all the assets of the Wireless Group, or a merger, consolidation
or similar business combination involving all or substantially all of the
business of the Wireless Group, other than any such transaction in which the
holders of the Economic Interests in the Wireless Group as of immediately prior
to the consummation of such transaction continue to hold, directly or
indirectly, at least two-thirds of such Economic Interests in the Wireless Group
or the successor corporation to the Wireless Group following such transaction,
or (2) the acquisition or acquisitions (including by merger or other similar
transaction) of any business or assets by the Wireless Group (other than
acquisitions of spectrum) after the Closing Date if the consideration paid by or
on behalf of the Wireless Group with respect to all such acquisitions exceeds
$25 billion. In addition, DoCoMo may tender shares of Current Wireless Tracking
Stock or AT&T Wireless Common Stock, prior to the expiration of 18 months
following the Closing Date, into a tender offer or exchange offer that is
approved by the Board.

          (c) Except as set forth in the next sentence, DoCoMo's rights under
this Agreement (and the Related Agreements) will not be transferable to any
transferee of any shares of AT&T Wireless Stock, other than a transferee that is
and remains a wholly owned Subsidiary of DoCoMo (and has entered into an
agreement with AT&T Wireless as set forth in Section 6.1(a)). DoCoMo may
transfer registration rights described in Article VII hereof to any transferee
of more than $1 billion of AT&T Wireless Stock from DoCoMo, and may transfer one
of its demand registration rights to any transferee of the Warrants (which
registration right shall apply only to registration of the Current Wireless
Tracking Stock or AT&T Wireless Common Stock issuable upon exercise of the
Warrants and not to the Warrants themselves and not to any New Tracking Stock
issued upon exercise of Warrants, but shall apply even if the amount of
Registrable Securities is less than the $500 million minimum contemplated by
Section 7.1(a)). DoCoMo shall provide written notice to AT&T and AT&T Wireless
within 10 Business Days from the date of consummation of the Transfer of any
such transfer of registration rights, which notice shall set forth in detail the
terms of any such Transfer. Unless and until such notice is received by AT&T or
AT&T Wireless, as the case may be, neither AT&T nor AT&T Wireless shall be
required to honor any registration rights of any such Transferee. In the event
demand registration rights are transferred in accordance with this Section
6.1(c), each reference to DoCoMo in Article VII hereof, to the extent such
reference and the relevant circumstances pertain to a Demand Registration, shall
be deemed to be or include, as appropriate, such transferee of demand
registration rights hereunder. Anything herein to the contrary notwithstanding,
nothing herein, and no such transfers of rights, shall alter or enlarge AT&T's
or AT&T Wireless's aggregate registration obligations under this Agreement.

                                      -39-
<PAGE>

          (d) Without AT&T's approval (prior to the Spin-off) or AT&T Wireless's
approval (following the Spin-off), DoCoMo may not at any time Transfer
securities to any one Person such that, after giving effect to the Transfer,
such Person would Beneficially Own in excess of 6% of the outstanding Current
Wireless Tracking Stock (before the Spin-off) or in excess of 6% of the
outstanding AT&T Wireless Common Stock (following the Spin-off); PROVIDED that
in the case of a Transfer of shares to a Person specified in Rule
13d-1(b)(1)(ii) under the Exchange Act that would be eligible based on such
Person's status and passive intent with respect to the ownership, holding and
voting of such shares to report such Person's ownership on Schedule 13G under
the Exchange Act, DoCoMo may Transfer to such Person up to a number of shares
such that, after giving effect to the Transfer, such Person would not
beneficially own in excess of 10% of the outstanding Current Wireless Tracking
Stock (before the Spin-off) or in excess of 10% of the outstanding AT&T Wireless
Common Stock (following the Spin-off). Any Transfer of the Warrants will be
subject to the foregoing restrictions (applied as if the Transferee had fully
exercised the transferred Warrants), and to all other transfer restrictions set
forth herein or in the Warrant Agreement.

          (e) Any certificates for shares of AT&T Wireless Stock issued pursuant
to the Purchase Agreement or issued thereafter in respect of any Transfer shall
bear a legend or legends referencing restrictions on transfer of such shares
under the Securities Act and under this Agreement; PROVIDED, that the holder of
any certificate(s) bearing any such legend referencing restrictions under the
Securities Act shall be entitled to receive from AT&T, with respect to Current
Wireless Tracking Stock, or AT&T Wireless, with respect to AT&T Wireless Common
Stock, new certificates for a like number of shares of such AT&T Wireless Stock
not bearing such legend upon the request of such holder and upon (x) such time
as such restriction under this Agreement is no longer applicable, with respect
to restrictions related to this Agreement and (y) delivery of an opinion of
counsel to such holder, which opinion is reasonably satisfactory in form and
substance to AT&T or to AT&T Wireless, as the case may be, and its counsel, that
the restriction referenced in such legend is no longer required in order to
ensure compliance with the Securities Act.

                                  ARTICLE VII

                               REGISTRATION RIGHTS

          Section 7.1 DEMAND REGISTRATIONS. (a) Subject to Section 7.3, at any
time following the eighteen-month anniversary of the Closing (or with respect to
a registration that would become effective following such eighteen-month
anniversary, following the seventeen-month anniversary of the Closing or at any
time following the occurrence of an event described in Section 6.1(b)), DoCoMo
may, on not more than six (6) separate occasions in the aggregate, require (i)
prior to the Spin-off, AT&T to file a registration statement under the
Securities Act in respect of all or a portion of DoCoMo's Registrable Securities
or (ii) following the Spin-off, AT&T Wireless to file a registration statement
under the Securities Act in respect of all or a portion of DoCoMo's Registrable
Securities; PROVIDED, in each case, that such request involves Registrable
Securities having an aggregate Market Value on the date of delivery of such
request of at least $500 million, by delivering to the Issuer written notice
stating that such right is being exercised, specifying the number of shares of
Current Wireless Tracking Stock or AT&T Wireless Common Stock to be included in
such registration (the shares subject to such request,

                                      -40-

<PAGE>

the "DEMAND SHARES") and describing the intended method of distribution thereof,
which may include an underwritten offering (a "DEMAND REQUEST"). Upon receiving
a Demand Request, the Issuer shall (i) use all reasonable efforts to file as
promptly as reasonably practicable a registration statement on such form as it
may reasonably deem appropriate (PROVIDED that in no event shall the Issuer be
obligated to register any securities on a "shelf" registration statement or
otherwise to register securities for offer or sale on a continuous or delayed
basis) providing for the registration of the sale of such Demand Shares pursuant
to the intended method of distribution (a "DEMAND REGISTRATION") and (ii) after
the filing of an initial version of the registration statement, use all
reasonable efforts to cause such registration statement to be declared effective
under the Securities Act as promptly as practicable after the date of filing of
such registration statement. DoCoMo (including any transferee to which DoCoMo
shall have transferred registration rights as permitted hereunder) may not
exercise more than one Demand Request in any 7 1/2 month period. In the event
that a Demand Request is delivered to AT&T prior to the Spin-off, but the Demand
Shares are not registered by the time of consummation of the Spin-off, such
Demand Request shall be deemed withdrawn and shall not count for the purposes of
determining the number of Demand Registrations to which DoCoMo is entitled
hereunder.

          (b) Anything in this Agreement to the contrary notwithstanding, the
Issuer shall be entitled to postpone and delay, for reasonable periods of time,
but in no event more than an aggregate of 90 days during any 12-month period (a
"BLACKOUT PERIOD"), the filing or effectiveness of any Demand Registration if
the Issuer shall determine that any such filing or the offering of any
Registrable Securities would (i) in the good faith judgment of the Board,
impede, delay or otherwise interfere with any pending or contemplated material
acquisition, corporate reorganization or other similar material transaction
involving the Issuer, including without limitation the Spin-off and the proposed
Exchange Offer, (ii) based upon advice from the Issuer's investment banker or
financial advisor, adversely affect any pending or contemplated financing,
offering or sale of any class of securities by the Issuer or the Spin-off or the
proposed Exchange Offer or (iii) in the good faith judgment of the Board,
require disclosure of material non-public information (other than information
relating to an event described in clauses (i) or (ii) above) which, if disclosed
at such time, would be harmful to the best interests of the Issuer and its
stockholders; PROVIDED, HOWEVER, that the Issuer shall give written notice to
DoCoMo of its determination to postpone or delay the filing of any Demand
Registration; PROVIDED, FURTHER, that except in the case of a registration
related to the Spin-off or the Exchange Offer, in the event that the Issuer
proposes to register AT&T Wireless Stock, whether or not for sale for its own
account, during a Blackout Period, DoCoMo shall have the right to exercise its
rights under Section 7.2 of this Agreement with respect to such registration,
subject to the limitations contained in this Agreement on the exercise of such
rights; and PROVIDED FURTHER that AT&T or AT&T Wireless, as the case may be,
shall file such registration statement or post-effective amendment and otherwise
continue with such registration as soon as practicable thereafter. Upon notice
by the Issuer to DoCoMo of any such determination, DoCoMo shall keep the fact of
any such notice strictly confidential, and during any Blackout Period, promptly
halt any offer, sale, trading or Transfer by it of any AT&T Wireless Stock for
the duration of the Blackout Period set forth in such notice (or until such
Blackout Period shall be earlier terminated in writing by the Issuer) and
promptly halt any use, publication, dissemination or distribution of the Demand
Registration, each prospectus included therein, and any amendment or supplement
thereto by it for the duration of the Blackout Period set forth in such notice
(or until such Blackout Period shall be earlier

                                      -41-
<PAGE>

terminated in writing by the Issuer) and, if so directed by the Issuer, will
deliver to the Issuer any copies then in its possession of the prospectus
covering such Registrable Securities.

          (c) In connection with an underwritten offering, if the managing
underwriter or co-managing underwriter reasonably and in good faith shall have
advised the Issuer or DoCoMo that, in its opinion, the number of Demand Shares
subject to a Demand Request exceeds the number that can be sold in such
offering, the Issuer shall include in such registration the number of Demand
Shares that, in the opinion of such managing underwriter or underwriters, can be
sold in such offering; PROVIDED that if as a result of any reduction pursuant to
this paragraph (c) the aggregate Market Value of the Demand Shares to be so
included is less than $500 million, DoCoMo may withdraw such Demand Request with
respect to all Demand Shares covered thereby and such registration shall not
count for the purposes of determining the number of Demand Registrations to
which DoCoMo is entitled under Section 7.1(a); PROVIDED, FURTHER, that if
pursuant to the Demand Request DoCoMo has given the Issuer the right to select
the managing underwriter (reasonably acceptable to DoCoMo) and the managing
underwriter so selected by the Issuer makes the determination that results in
the reduction pursuant to this paragraph (c) such that the aggregate Market
Value of the Demand Shares to be so included is less than $500 million, then
DoCoMo may elect to proceed with the registration, and such registration shall
not count for the purposes of determining the number of Demand Registrations to
which DoCoMo is entitled under Section 7.1(a).

          (d) In connection with any underwritten offering, the managing
underwriter or underwriters for such Demand Registration shall be selected by
DoCoMo; PROVIDED that such managing underwriter shall be a nationally recognized
investment banking firm and shall be reasonably acceptable to the Issuer and
provided, further that with respect to any registration effected in connection
with Section 4.3(e) hereof, AT&T or AT&T Wireless, as the case may be, will be
entitled to select the managing underwriter or underwriters. In addition to the
foregoing, the Issuer may, at its option, select a nationally recognized
investment banking firm reasonably acceptable to DoCoMo to act as a co-managing
underwriter. The Issuer shall have the right to approve the selection of the
counsel to any managing underwriter hereunder, which approval will not be
unreasonably withheld.

          Section 7.2 PIGGY-BACK REGISTRATION. (a) If, at any time following the
expiration or termination of the transfer restrictions set forth in Section 6.1,
for so long as DoCoMo owns Registrable Securities having an aggregate Market
Value of at least $1 billion or representing at least 2% of the Economic
Interest Percentage of AT&T Wireless (prior to the Spin-off) or of the
outstanding voting securities of AT&T Wireless (after the Spin-off), AT&T (prior
to the Spin-off) or AT&T Wireless (after the Spin-off) proposes to register any
Equity Shares on its behalf or on behalf of any of its stockholders, on a form
and in a manner that would permit registration of the Registrable Securities
(other than in connection with dividend reinvestment plans, rights offerings or
a registration statement on Form S-4 or S-8 or any similar successor form), the
Issuer shall give reasonably prompt written notice to DoCoMo of its intention to
do so, which notice shall be given to DoCoMo not less than 45 days prior to the
contemplated filing date, if it is reasonably practicable to do so at such time,
and otherwise promptly after an initial filing date is first contemplated, but
in no event less than 12 Business Days prior to the contemplated filing date for
such registration statement. Upon the written election of DoCoMo (a "PIGGY-BACK
REQUEST") given within 20 Business Days following the

                                      -42-
<PAGE>

receipt of written notice from the Issuer (but in no event later than two
Business Days prior to the contemplated filing date for such registration
statement indicated in such notice), which election shall specify the number of
the Registrable Securities intended to be disposed of by DoCoMo, the Issuer
shall include in such registration statement (a "PIGGY-BACK REGISTRATION"),
subject to the provisions of this Section 7.2, such number of the Registrable
Securities as shall be set forth in such Piggy-Back Request. No registration
effected under this Section 7.2 shall relieve the Issuer of its obligations to
effect a Demand Registration required under Section 7.1.

          (b) In the event that, following the expiration or termination of the
transfer restrictions set forth in Section 6.1, AT&T (prior to the Spin-off) or
AT&T Wireless (after the Spin-off) proposes to register Equity Shares in
connection with an underwritten offering and a nationally recognized investment
banking firm selected by AT&T or AT&T Wireless, as the case may be, to act as
managing underwriter thereof reasonably and in good faith shall have advised the
Issuer, DoCoMo, or any other holder of Equity Shares intending to offer Equity
Shares in the offering (each, an "OTHER HOLDER") that, in its opinion, the
inclusion in the registration statement of some or all of the Registrable
Securities sought to be registered by DoCoMo would adversely affect the price or
success of the offering, the Issuer shall include in such registration statement
such number of Equity Shares as it was advised can be sold in such offering
without such an effect (the "MAXIMUM NUMBER") as follows and in the following
order of priority: (A) FIRST, if such registration was initiated by AT&T or AT&T
Wireless, such number of shares of AT&T Wireless Stock as AT&T or AT&T Wireless
intended to be registered and sold, or, if such registration is on behalf of any
Other Holders, such number of Equity Shares as such Other Holders intended to be
registered and sold, and (B) SECOND, if and to the extent that the number of
Equity Shares to be registered under clause (A) is less than the Maximum Number,
such number of Equity Shares as DoCoMo, AT&T or AT&T Wireless (if such
registration was not initiated by AT&T or AT&T Wireless) and any Other Holders
(or additional Other Holders) shall have intended to register that, when added
to the number of Equity Shares to be registered under clause (A), is less than
or equal to the Maximum Number, on a pro rata basis according to the total
number of Equity Shares intended to be registered by each such Person.

          (c) The rights set forth in this Section 7.2 shall not apply to any
registration in connection with the Spin-off or the Exchange Offer.

          Section 7.3 LIMITATIONS ON DEMAND REGISTRATIONS; TERMINATION OF
REGISTRATION OBLIGATION. (a) Except to the extent DoCoMo is entitled to exercise
demand registration rights after the seventeen-month anniversary of the Closing
in accordance with the first sentence of Section 7.1(a), DoCoMo will not be
entitled to exercise demand registration rights under this Agreement at any time
that it is prohibited from transferring the relevant securities pursuant to the
Transfer restrictions contained in Section 6.1. Nothing in this Article VII
shall affect or supersede any of the Transfer restrictions set forth in Article
VI hereof.

          (b) Without limiting the rights of a transferee of Warrants as set
forth in the second sentence of Section 6.1(c), DoCoMo will be entitled to
exercise demand registration rights under this Agreement only if at the time of
exercise of any such demand DoCoMo (together with its wholly owned Subsidiaries)
owns Registrable Securities having an aggregate Market Value of at least $1
billion or representing at least 2% of the Economic Interest

                                      -43-
<PAGE>

Percentage of AT&T Wireless (prior to the Spin-off) or of the outstanding voting
securities of AT&T Wireless (after the Spin-off).

          (c) Anything in this Agreement to the contrary notwithstanding, if at
any time AT&T, with respect to Current Wireless Tracking Stock, or AT&T
Wireless, with respect to AT&T Wireless Common Stock, shall obtain a written
opinion of legal counsel reasonably satisfactory to DoCoMo to the effect that
the Registrable Securities may be publicly offered for sale in the United States
by DoCoMo without restriction as to manner of sale and amount of securities sold
and without registration under the Securities Act, the Issuer shall no longer be
obligated to file or maintain a registration statement with respect to the
Registrable Securities pursuant to this Agreement, unless at a later date DoCoMo
delivers to the Issuer an opinion of counsel to DoCoMo, which opinion is
reasonably satisfactory in form and substance to counsel to the Issuer, that
registration is then required as a result of a change in applicable law.

          Section 7.4 REGISTRATION PROCEDURES. (a) In connection with each
registration statement prepared pursuant to this Article VII, and in accordance
with the intended method or methods of distribution of the Registrable
Securities as described in such registration statement, the Issuer, as soon as
reasonably practicable and to the extent practicable, shall:

          (i)  prepare and file with the SEC a registration statement on an
               appropriate registration form of the SEC and use reasonable
               efforts to cause such registration statement to become and remain
               effective, which registration statement shall comply as to form
               in all material respects with the requirements of the applicable
               form and include all financial statements required by such form
               to be filed therewith; PROVIDED that before filing a registration
               statement or prospectus or any amendments or supplements thereto,
               the Issuer shall furnish to one counsel selected by DoCoMo, draft
               copies of all such documents proposed to be filed at least 15
               Business Days (in the case of a Demand Registration) or 10
               Business Days (in the case of any other registration) prior to
               such filing (in each case, only if it is reasonably practicable
               to do so at such times, and otherwise promptly upon circulation
               of the first draft of such documents circulated to the
               underwriters, but in no event less than 10 days or five days,
               respectively), which documents will be subject to the reasonable
               review and comment of DoCoMo and its agents and representatives
               and the underwriters, if any;

          (ii) furnish without charge to DoCoMo, and the underwriters, if any,
               at least one conformed copy of the registration statement and
               each post-effective amendment or supplement thereto (including
               all schedules and exhibits but excluding all documents
               incorporated or deemed incorporated therein by reference, unless
               requested in writing by DoCoMo, or an underwriter) and such
               number of copies of the registration statement and each amendment
               or supplement thereto and the summary, preliminary, final,
               amended or supplemented prospectuses included in such
               registration statement as DoCoMo or such underwriter may
               reasonably request in order to facilitate the public sale or
               other disposition of the Registrable Securities being sold by
               DoCoMo (the Issuer hereby consents to the use in
                                      -44-
<PAGE>

               accordance with the U.S. securities laws of such registration
               statement (or post-effective amendment thereto) and each such
               prospectus (or preliminary prospectus or supplement thereto) by
               DoCoMo and the underwriters, if any, in connection with the
               offering and sale of the Registrable Securities covered by such
               registration statement or prospectus);

         (iii) use all reasonable efforts to keep such registration statement
               effective for the earlier of (A) 60 days and (B) such time as all
               of the securities covered by the registration statement have been
               disposed (the "EFFECTIVE PERIOD"); prepare and file with the SEC
               such amendments, post-effective amendments and supplements to the
               registration statement and the prospectus as may be necessary to
               maintain the effectiveness of the registration for the Effective
               Period and to cause the prospectus (and any amendments or
               supplements thereto) to be filed;

          (iv) use all reasonable efforts to register or qualify the Registrable
               Securities covered by such registration statement under such
               other securities or "blue sky" laws of such jurisdictions in the
               United States as are reasonably necessary, keep such
               registrations or qualifications in effect for so long as the
               registration statement remains in effect, and do any and all
               other acts and things that may be reasonably necessary to enable
               DoCoMo or any underwriter to consummate the disposition of the
               Registrable Securities in such jurisdictions; PROVIDED, HOWEVER,
               that in no event shall the Issuer be required: to qualify to do
               business as a foreign corporation in any jurisdiction where it
               would not, but for the requirements of this subparagraph (iv), be
               required to be so qualified; to execute or file any general
               consent to service of process under the laws of any jurisdiction;
               to take any action that would subject it to service of process in
               suits other than those arising out of the offer and sale of the
               securities covered by the registration statement; or to subject
               itself to taxation in any jurisdiction where it would not
               otherwise be obligated to do so, but for this subparagraph (iv);

          (v)  use all reasonable efforts to cause the Registrable Securities to
               be registered with or approved by such other governmental
               agencies or authorities as may be necessary to enable DoCoMo to
               consummate the disposition of the Registrable Securities;

          (vi) use all reasonable efforts to cause all Registrable Securities
               covered by such registration statement to be listed on the NYSE
               or on the principal securities exchange on which the AT&T
               Wireless Stock of the same class as such Registrable Securities
               is then listed, or if no similar securities are then so listed,
               cause all such Registrable Securities to be listed on a United
               States national securities exchange or secure designation of each
               such Registrable Security as a Nasdaq National Market "national
               market system security" within the meaning of Rule 11Aa2-1 of the
               SEC or secure

                                      -45-
<PAGE>

               National Association of Securities Dealers Automated Quotation
               authorization for such shares and, without limiting the
               generality of the foregoing, use all reasonable efforts to take
               such actions as may be required by the Issuer as the issuer of
               such Registrable Securities to facilitate the registration of at
               least two market makers as such with respect to such shares with
               the National Association of Securities Dealers, Inc.;

         (vii) promptly notify DoCoMo and the managing underwriter or
               underwriters, if any, after becoming aware thereof, (A) when the
               registration statement or any related prospectus or any amendment
               or supplement thereto has been filed, and, with respect to the
               registration statement or any post-effective amendment, when the
               same has become effective, (B) of any request by the SEC or any
               United States state securities authority for amendments or
               supplements to the registration statement or the related
               prospectus or for additional information, (C) of the issuance by
               the SEC of any stop order suspending the effectiveness of the
               registration statement or the initiation of any proceedings for
               that purpose, (D) of the receipt by the Issuer of any
               notification with respect to the suspension of the qualification
               of the Registrable Securities for sale in any jurisdiction or the
               initiation of any proceeding for such purpose or (E) within the
               Effective Period of the happening of any event or the existence
               of any fact that makes any statement in the registration
               statement or any post-effective amendment thereto, prospectus or
               any amendment or supplement thereto, or any document incorporated
               therein by reference untrue in any material respect or that
               requires the making of any changes in the registration statement
               or post-effective amendment thereto or any prospectus or
               amendment or supplement thereto so that they will not contain any
               untrue statement of a material fact or omit to state any material
               fact required to be stated therein or necessary to make the
               statements therein, in light of the circumstances under which
               they were made, not misleading;

        (viii) during the Effective Period, use all reasonable efforts to
               obtain, as promptly as practicable, the withdrawal of any order
               enjoining or suspending the use or effectiveness of the
               registration statement or any post-effective amendment thereto or
               the lifting of any suspension of the qualification of any of the
               Registrable Securities for sale in any jurisdiction;

          (ix) deliver promptly to DoCoMo and the managing underwriters, if any,
               copies of all correspondence between the SEC and the Issuer, its
               counsel or auditors and all memoranda relating to discussions
               with the SEC or its staff with respect to the registration
               statement and permit DoCoMo to do such investigation, with
               respect to information contained in or omitted from the
               registration statement as it deems reasonably necessary for the
               purpose of conducting customary due diligence with respect to the
               Issuer,

                                      -46-
<PAGE>

               PROVIDED any such investigation shall not interfere unreasonably
               with the Issuer's business;

          (x)  use all reasonable efforts to provide and cause to be maintained
               a transfer agent and registrar for all such Registrable
               Securities covered by such registration statement not later than
               the effective date of such registration statement;

          (xi) cooperate with DoCoMo and the managing underwriter or
               underwriters, if any, to facilitate the timely preparation and
               delivery of certificates representing such Registrable Securities
               to be sold under the registration statement in a form eligible
               for deposit with the Depository Trust Corporation not bearing any
               restrictive legends and not subject to any stop transfer order
               with any transfer agent, and cause such Registrable Securities to
               be issued in such denominations and registered in such names as
               the managing underwriters, if any, may request in writing or, if
               not an underwritten offering, in accordance with the instructions
               of DoCoMo, in each case at least two Business Days prior to any
               sale of Registrable Securities;

         (xii) in the case of an underwritten offering, use all reasonable
               efforts to enter into an underwriting agreement customary in form
               and scope for underwritten secondary offerings of the nature
               contemplated by the applicable registration statement;

        (xiii) use all reasonable efforts to obtain an opinion from the
               Issuer's counsel and a "cold comfort" letter from the Issuer's
               independent public accountants (and, if necessary, any other
               independent certified public accountants of any Subsidiary of the
               Issuer or of any business acquired by the Issuer for which
               financial statements and financial data is, or is required to be,
               included in the registration statement) in customary form and
               covering such matters as are customarily covered by such opinions
               and "cold comfort" letters in connection with an offering of the
               nature contemplated by the applicable registration statement;

         (xiv) not later than the effective date of the applicable registration
               statement, provide a CUSIP number for all Registrable Securities;

          (xv) provide reasonable assistance to the underwriters in the
               marketing of such Registrable Securities, including by making
               reasonably available appropriate members of its management (but
               without unduly burdening such individuals or the Issuer) as part
               of the road shows in support of such offering (it being
               understood that the reasonable level of such assistance will take
               into account the size of the offering and other relevant
               factors); and

                                      -47-
<PAGE>

         (xvi) use all reasonable efforts to provide to counsel to DoCoMo and
               to the managing underwriters, if any, no later than the time of
               filing of any document that is to be incorporated by reference
               into the registration statement or prospectus (after the initial
               filing of such registration statement), copies of any such
               document.

          (b) In the event that the Issuer would be required, pursuant to
Section 7.4(a)(vii)(E) above, to notify DoCoMo or the managing underwriter or
underwriters, if any, of the happening of any event specified therein, the
Issuer shall, subject to the provisions of Section 7.1(b) hereof, as promptly as
practicable, prepare and furnish to DoCoMo and to each such underwriter a
reasonable number of copies of a prospectus supplemented or amended so that, as
thereafter delivered to purchasers of Registrable Securities that have been
registered pursuant to this Agreement, such prospectus shall not contain an
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements therein, in the light of
the circumstances under which they were made, not misleading. DoCoMo agrees
that, upon receipt of any notice from the Issuer pursuant to Section
7.4(a)(vii)(E) hereof, DoCoMo shall, and shall use all reasonable efforts to,
cause any sales or placement agent or agents for the Registrable Securities and
the underwriters, if any, to forthwith discontinue disposition of the
Registrable Securities until such Person shall have received copies of such
amended or supplemented prospectus and, if so directed by the Issuer, to destroy
or to deliver to the Issuer all copies, other than permanent file copies, then
in its possession of the prospectus (prior to such amendment or supplement)
covering such Registrable Securities as soon as practicable after DoCoMo's
receipt of such notice.

          (c) DoCoMo shall furnish to the Issuer in writing such information
regarding DoCoMo and its intended method of distribution of the Registrable
Securities as the Issuer may from time to time reasonably request in writing, to
the extent that such information is required in order for the Issuer to comply
with its obligations under all applicable securities and other laws and to
ensure that the prospectus relating to such Registrable Securities conforms to
the applicable requirements of the Securities Act and the rules and regulations
thereunder. DoCoMo shall notify the Issuer as promptly as practicable of any
inaccuracy or change in information previously furnished by DoCoMo to the Issuer
or of the occurrence of any event, in either case as a result of which any
prospectus relating to the Registrable Securities contains or would contain an
untrue statement of a material fact or omits to state any material fact required
to be stated therein or necessary to make the statements therein, in light of
the circumstances under which they were made, not misleading, and promptly
furnish to the Issuer any additional information required to correct and update
any previously furnished information or required so that such prospectus shall
not contain an untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading.

          (d) DoCoMo agrees not to effect any public sale or distribution of any
Registrable Securities, including any sale pursuant to Rule 144 under the
Securities Act, and not to effect any such public sale or distribution of any
other equity security of Issuer or of any security convertible into or
exchangeable or exercisable for any equity security of the Issuer (in each case,
other than as part of such underwritten public offering) during the 10 days
prior to, and during the 90 day period (or such longer period as DoCoMo agrees
with the underwriter of

                                      -48-
<PAGE>

such offering) beginning on, the consummation of any underwritten public
offering of the Registrable Securities covered by a registration statement
referred to in Section 7.2 to the extent DoCoMo's Registrable Securities are
being sold thereunder.

          (e) In the case of any registration under Section 7.1 pursuant to an
underwritten offering, or in the case of a registration under Section 7.2 if the
Issuer has entered into an underwriting agreement in connection therewith, all
shares of AT&T Wireless Stock to be included in such registration shall be
subject to the applicable underwriting agreement and no Person may participate
in such registration unless such Person agrees to sell such Person's securities
on the basis provided therein and completes and executes all questionnaires,
indemnities, underwriting agreements and other documents (other than powers of
attorney) that must be executed in connection therewith, and provides such other
information to the Issuer or the underwriter as may be reasonably requested to
register such Person's AT&T Wireless Stock.

          Section 7.5 REGISTRATION EXPENSES. DoCoMo shall bear all agent fees
and commissions, underwriting discounts and commissions and fees and
disbursements of its counsel and accountants in connection with any registration
of any Registrable Securities pursuant to Section 7.1 or 7.2; PROVIDED that with
respect to any registration effected in connection with Section 4.3(e) hereof,
the Issuer will pay the reasonable fees and expenses of DoCoMo's counsel related
to such registration. The Issuer shall bear all other fees and expenses in
connection with any registration statement pursuant to Section 7.1 or 7.2,
including all registration and filing fees, all printing costs, and all fees and
expenses of counsel and accountants for the Issuer.

          Section 7.6 INDEMNIFICATION; CONTRIBUTION. (a) The Issuer of the
securities to be registered in the relevant registration shall, and it hereby
agrees to, indemnify and hold harmless DoCoMo and its respective directors,
officers, employees and controlling Persons, if any, and each underwriter, its
partners, directors, officers, employees and controlling Persons, if any, in any
offering or sale of the Registrable Securities, against any losses, claims,
damages or liabilities, actions or proceedings (whether commenced or threatened)
in respect thereof and expenses (including reasonable fees of counsel)
(collectively, "CLAIMS") to which each such indemnified party may become
subject, insofar as such Claims (including any amounts paid in settlement
effected with the consent of the Issuer as provided herein), or actions or
proceedings in respect thereof, arise out of or are based upon an untrue
statement or alleged untrue statement of a material fact contained in any
registration statement, or any preliminary or final prospectus contained
therein, or any amendment or supplement thereto, or any document incorporated by
reference therein, or arise out of or are based upon any omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances in which
they were made, not misleading, and the Issuer shall, and it hereby agrees to,
reimburse periodically DoCoMo or any such underwriter for any legal or other
out-of-pocket expenses reasonably incurred by them in connection with
investigating or defending any such Claims; PROVIDED, HOWEVER, that the Issuer
shall not be liable to any such Person in any such case to the extent that any
such Claims arise out of or are based upon an untrue statement or alleged untrue
statement or omission or alleged omission made in such registration statement,
or preliminary or final prospectus, or amendment or supplement thereto, (i) in
reliance upon and in conformity with information furnished to the Issuer by
DoCoMo or any underwriter or representative of DoCoMo expressly for use therein,
or by DoCoMo's failure to furnish the Issuer, upon request, with the information
with respect to DoCoMo, or any

                                      -49-
<PAGE>

underwriter or representative of DoCoMo, or DoCoMo's intended method of
distribution, that is the subject of the untrue statement or omission or (ii) if
the Issuer shall sustain the burden of proving that DoCoMo or such underwriter
sold securities to the Person alleging such Claims without sending or giving, at
or prior to the written confirmation of such sale, a copy of the applicable
prospectus (excluding any documents incorporated by reference therein) or of the
applicable prospectus, as then amended or supplemented (excluding any documents
incorporated by reference therein), if the Issuer had previously furnished
copies thereof to DoCoMo or such underwriter, and such prospectus corrected such
untrue statement or alleged untrue statement or omission or alleged omission
made in such registration statement.

          (b) DoCoMo shall, and hereby agrees to (i) indemnify and hold harmless
AT&T, with respect to the registration of Current Wireless Tracking Stock, or
AT&T Wireless, with respect to the registration of AT&T Wireless Common Stock,
its directors, officers, employees and controlling Persons, if any, and each
underwriter, its partners, officers, directors, employees and controlling
Persons, if any, in any offering or sale of Registrable Securities, against any
Claims to which each such indemnified party may become subject, insofar as such
Claims (including any amounts paid in settlement effected with the consent of
DoCoMo as provided herein), or actions or proceedings in respect thereof, arise
out of or are based upon an untrue statement or alleged untrue statement of a
material fact contained in such registration statement, or any preliminary or
final prospectus contained therein, or any amendment or supplement thereto, or
any document incorporated by reference therein, or arise out of or are based
upon any omission or alleged omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
in each case only to the extent that such untrue statement or alleged untrue
statement or omission or alleged omission was made in reliance upon and in
conformity with written information furnished to AT&T or AT&T Wireless, as the
case may be, by DoCoMo expressly for use therein, and (ii) periodically
reimburse AT&T or AT&T Wireless, as the case may be, for any legal or other
out-of-pocket expenses reasonably incurred by AT&T or AT&T Wireless, as the case
may be, in connection with investigating or defending any such Claim.

          (c) Promptly after receipt by an indemnified party under Section
7.6(a) or Section 7.6(b) of written notice of the commencement of any action or
proceeding for which indemnification under Section 7.6(a) or Section 7.6(b) may
be requested, such indemnified party shall notify such indemnifying party in
writing of the commencement of such action or proceeding; but the omission so to
notify the indemnifying party shall not relieve it from any liability which it
may have to any indemnified party in respect of such action or proceeding
hereunder unless the indemnifying party was materially prejudiced by such
failure of the indemnified party to give such notice, and in no event shall such
omission relieve the indemnifying party from any other liability it may have to
such indemnified party. In case any such action or proceeding shall be brought
against any indemnified party and it shall notify an indemnifying party of the
commencement thereof, such indemnifying party shall be entitled to participate
therein and, to the extent that it shall determine, jointly with any other
indemnifying party similarly notified, to assume the defense thereof, with
counsel reasonably satisfactory to such indemnified party, and, after notice
from the indemnifying party to such indemnified party of its election so to
assume the defense thereof, such indemnifying party shall not be liable to such
indemnified party for any legal or any other expenses subsequently incurred by
such indemnified party in connection with the defense thereof other than
reasonable costs of

                                      -50-
<PAGE>

investigation; PROVIDED, HOWEVER, that (i) if the indemnifying party fails to
take reasonable steps necessary to defend diligently the action or proceeding
within 20 days after receiving notice from such indemnified party that the
indemnified party believes it has failed to do so; (ii) if such indemnified
party who is a defendant in any action or proceeding that is also brought
against the indemnifying party reasonably shall have concluded that there may be
one or more legal defenses available to such indemnified party that are not
available to the indemnifying party; or (iii) if representation of both parties
by the same counsel is otherwise inappropriate under applicable standards of
professional conduct, then, in any such case, the indemnified party shall have
the right to assume or continue its own defense as set forth above (but with no
more than one firm of counsel for all indemnified parties in each jurisdiction)
and the indemnifying party shall be liable for any expenses therefor (including,
without limitation, any such reasonable counsel's fees). If the indemnifying
party is not entitled to, or elects not to, assume the defense of a claim, it
will not be obligated to pay the fees and expenses of more than one counsel (and
one local counsel per jurisdiction) for each indemnified party with respect to
such claim. The indemnifying party will not be subject to any liability for any
settlement made without its consent, which consent shall not be unreasonably
withheld or delayed. No indemnifying party shall, without the prior written
consent of the indemnified party, compromise or consent to entry of any judgment
or enter into any settlement agreement with respect to any action or proceeding
in respect of which indemnification is sought under Section 7.6(a) or Section
7.6(b) (whether or not the indemnified party is an actual or potential party
thereto), unless such compromise, consent or settlement includes an
unconditional release of the indemnified party from all liability in respect of
such claim or litigation, does not subject the indemnified party to any material
injunctive relief or other material equitable remedy and does not include a
statement or admission of fault, culpability or a failure to act, by or on
behalf of the indemnified party.

          (d) DoCoMo, AT&T and AT&T Wireless agree that if, for any reason, the
indemnification provisions contemplated by Sections 7.6(a) or 7.6(b) hereof are
unavailable to or are insufficient to hold harmless an indemnified party in
respect of any Claims referred to therein, then each indemnifying party shall
contribute to the amount paid or payable by such indemnified party as a result
of such Claims in such proportion as is appropriate to reflect the relative
fault of, the indemnifying party, on the one hand, and the indemnified party, on
the other hand, with respect to such offering of securities. The relative fault
of such indemnifying party and indemnified party shall be determined by
reference to, among other things, whether the untrue or alleged untrue statement
of a material fact or omission or alleged omission to state a material fact
relates to information supplied by such indemnifying party or by such
indemnified party, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.
If, however, the allocation in the second preceding sentence is not permitted by
applicable law, then each indemnifying party shall contribute to the amount paid
or payable by such indemnified party in such proportion as is appropriate to
reflect not only such relative faults, but also the relative benefits of the
indemnifying party and the indemnified party, as well as any other relevant
equitable considerations. The parties hereto agree that it would not be just and
equitable if contributions pursuant to this Section 7.6(d) were to be determined
by pro rata allocation or by any other method of allocation that does not take
into account the equitable considerations referred to in the preceding sentences
of this Section 7.6(d). The amount paid or payable by an indemnified party as a
result of the Claims referred to above shall be deemed to include (subject to
the limitations set forth in Section 7.6(c) hereof) any legal or other fees or
expenses reasonably

                                      -51-
<PAGE>

incurred by such indemnified party in connection with investigating or defending
any such action, proceeding or claim. No Person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act or
any successor provision thereof) shall be entitled to contribution from any
Person who was not guilty of such fraudulent misrepresentation.

                                  ARTICLE VIII

                                PREEMPTIVE RIGHTS

          Section 8.1 PREEMPTIVE RIGHTS. (a) Subject to Section 8.2, as soon as
practicable after AT&T decides to issue any additional Equity Shares (other than
any Equity Shares representing all or any portion of AT&T's Retained Wireless
Interest), prior to the consummation of the Spin-off, or AT&T Wireless decides
to issue any Equity Shares after the consummation of the Spin-off (collectively,
the "ADDITIONAL SECURITIES") (other than to a wholly owned Subsidiary of the
Issuer and exclusive of any Equity Shares issued upon exercise of the Warrants),
but in any event at least ten Business Days prior to issuing such Additional
Securities to any Person other than DoCoMo or any of its Subsidiaries, the
Issuer shall notify DoCoMo by written notice of such proposed issuance (which
notice shall specify, to the extent practicable, the purchase price, if any,
for, and the terms and conditions of, such Additional Securities) and shall
offer to sell to DoCoMo and/or its designated wholly owned Subsidiaries such
Additional Securities as may be designated by DoCoMo at the Purchase Price as
provided in Section 8.1(e); PROVIDED that, with respect to any issuances
pursuant to employee, officer or director benefit plans or arrangements, such
notice and offer shall only be required within 10 Business Days of each March 31
and September 30 and shall be made in respect of all such issuances made during
the six month period ending on such March 31 or September 30 (except with
respect to the first such notice after the Closing Date, which shall relate only
to issuance made during the period from the Closing Date through such March 31,
2001, or September 30, 2001, as applicable). DoCoMo's right to purchase
Additional Securities in accordance with Sections 8.1(c) and (d) and this
Article VIII are referred to herein as "PREEMPTIVE RIGHTS." In the case of a
proposed public offering as to which the price is not known as of the time
notice is given, the notice shall specify the range of expected prices as
determined in good faith by the Issuer. The Preemptive Rights shall not be
triggered by issuances of securities upon exchange or conversion of previously
outstanding securities (including, without limitation, issuances in connection
with any rights plan but not including issuances in connection with the exercise
of options or other rights granted to employees, officers, directors or
consultants of the Issuer) or by pro rata distributions to shareholders
(including without limitation stock dividends and stock splits); PROVIDED that
DoCoMo may exercise its Preemptive Rights hereunder upon the conversion of
convertible securities that become outstanding after the Closing and that,
because of the nature of the security, the number of shares of common stock into
which such security is convertible was not calculable and therefore DoCoMo could
not exercise its Preemptive Rights with respect thereto. For the avoidance of
doubt, the Preemptive Rights shall not apply to the exchange of AT&T Wireless
Common Stock for Current Wireless Tracking Stock or New Tracking Stock, or the
distribution of AT&T Wireless Common Stock to holders of common stock of AT&T,
in each case pursuant to the Spin-off, or to securities issued in the Exchange
Offer.

                                      -52-
<PAGE>

          (b) The Preemptive Rights may be exercised, in whole or in part, by
DoCoMo by its acceptance in writing of an offer referred to in Section 8.1(a)
within 30 days of the notice given to DoCoMo. If DoCoMo wishes to subscribe for
a number of Additional Securities less than the number to which it is entitled
under this section, DoCoMo may do so and shall, in the notice of exercise of the
offer, specify the number of Additional Securities that DoCoMo wishes to
purchase. The closing of the purchase and sale of Additional Securities pursuant
to any exercise of Preemptive Rights shall occur as promptly as practicable
following DoCoMo's notice of exercise, PROVIDED that the closing shall be
subject to and shall occur no earlier than concurrently with the consummation of
the issuance giving rise to the Preemptive Rights. The closing shall also be
subject to the receipt of any necessary regulatory approvals, the expiration of
any required waiting periods and the absence of any legal prohibition on such
closing, and the Issuer and DoCoMo will use their reasonable best efforts to
satisfy the conditions set forth in this sentence, PROVIDED that the Issuer will
have no obligation to DoCoMo to consummate or to use any efforts to consummate,
the issuance giving rise to the Preemptive Rights.

          (c) If the Preemptive Rights are exercised and if DoCoMo's Economic
Interest Percentage prior to the issuance of Additional Securities is at least
12%, the Issuer shall sell to DoCoMo and/or its wholly owned Subsidiaries as may
be designated by DoCoMo all or any portion specified by DoCoMo of an amount of
Additional Securities such that, after giving effect to the proposed issuance
(including the issuance to DoCoMo pursuant to the Preemptive Rights and
including any related issuance resulting from the exercise of preemptive rights
by any unrelated Person with respect to the same issuance that gave rise to the
exercise of Preemptive Rights by DoCoMo), but without considering (either as
owned by DoCoMo or as outstanding) any Equity Shares acquired by DoCoMo upon
exercise of the Warrants, DoCoMo's Economic Interest Percentage would equal 16%
(which amount shall constitute the "PREEMPTIVE SHARE AMOUNT" for purposes of any
exercise of Preemptive Rights to which this paragraph (c) applies). If, at the
time of the determination of any Preemptive Share Amount, any other Person has
preemptive or other equity purchase rights similar to the Preemptive Rights,
such Preemptive Share Amount shall be recalculated to take into account the
amount of Equity Shares to be sold to such Persons, rounding up such Preemptive
Share Amount to the nearest whole Equity Share.

          (d) If the Preemptive Rights are exercised and if DoCoMo's Economic
Interest Percentage prior to the issuance of Additional Securities is less than
12%, the Issuer shall sell to DoCoMo and/or its wholly owned Subsidiaries as may
be designated by DoCoMo all or any portion specified by DoCoMo of an amount of
Additional Securities such that, after giving effect to the proposed issuance
(including the issuance to DoCoMo pursuant to the Preemptive Rights and
including any related issuance resulting from the exercise of preemptive rights
by any unrelated Person with respect to the same issuance that gave rise to the
exercise of Preemptive Rights by DoCoMo), DoCoMo's Economic Interest Percentage
would equal its Economic Interest Percentage immediately prior to such issuance
(which amount shall constitute the "PREEMPTIVE SHARE AMOUNT" for purposes of any
exercise of Preemptive Rights to which this paragraph (d) applies). If, at the
time of the determination of any Preemptive Share Amount, any other Person has
preemptive or other equity purchase rights similar to the Preemptive Rights,
such Preemptive Share Amount shall be recalculated to take into account the
amount of Equity Shares to be sold to such Persons, rounding up such Preemptive
Share Amount to the nearest whole Equity Share.

                                      -53-
<PAGE>

          (e) The "PURCHASE PRICE" for the Additional Securities to be issued
pursuant to the exercise of Preemptive Rights shall be payable only in cash
(unless otherwise mutually agreed by the Issuer and DoCoMo) and, except as
otherwise set forth below, shall equal per Additional Security the per security
issuance price for the Additional Securities giving rise to such Preemptive
Right. In the case of exercise of Preemptive Rights resulting from issuances
pursuant to employee, officer or director benefit plans or arrangements, the
Purchase Price shall be based on the average closing price for the shares of
Current Wireless Tracking Stock or AT&T Wireless Common Stock, as the case may
be, for the 30-trading day period ending on the relevant March 31 or September
30, as the case may be. In the case of the exercise of Preemptive Rights under
Section 8.1(c) for Additional Securities in excess of the number of Additional
Securities necessary to maintain DoCoMo's Economic Interest Percentage as in
effect immediately prior to the applicable issuance (the "EXCESS SECURITIES"),
the Purchase Price for the Excess Securities per Excess Security shall be the
greater of (i) the per security issuance price for the Additional Securities
giving rise to such exercise of Preemptive Right and (ii) the per security
issuance price for the most recent preceding issuance with respect to which
DoCoMo did not exercise its full Preemptive Rights and that previously diluted
DoCoMo's Economic Interest Percentage (with the reference price under this
clause (ii) being the issuance price in the first such immediately preceding
issuance with respect to a number of Additional Securities up to the number that
DoCoMo was entitled to but did not purchase pursuant to exercise of its
Preemptive Rights with respect to such issuance and, to the extent such number
is less than the number of Excess Securities being purchased pursuant to Section
8.1(c), then repeating the same procedure with respect to the next immediately
preceding issuance or issuances); PROVIDED that, upon DoCoMo exercising
Preemptive Rights for Excess Securities pursuant to Section 8.1(c) in an amount
sufficient to make up all or part of the dilution resulting from a prior
issuance or issuances as to which DoCoMo did not exercise its full Preemptive
Rights, DoCoMo shall be deemed to have exercised Preemptive Rights in full or in
such part, as applicable, with respect to such prior issuance for purposes of
any subsequent application of the reference price in the foregoing clause (ii);
PROVIDED, FURTHER, that in the event DoCoMo attempts to exercise but is unable
to exercise any Preemptive Rights by virtue of Section 8.2(b), any subsequent
purchase of Excess Securities shall be applied, first, against the number of
Additional Securities that DoCoMo was prevented from purchasing pursuant to
Section 8.2(b), and the Purchase Price for such Excess Securities, up to such
number, shall be determined only by reference to clause (i) of this sentence and
without regard to clause (ii) of this sentence. The issuance price with respect
to any issuance of Additional Securities shall be the actual price paid by the
other Person or Persons for such Additional Securities (without deducting any
costs or expenses of the Issuer in connection therewith). In the case of any
issuance of Additional Securities other than solely for cash, the Issuer and
DoCoMo shall in good faith seek to agree upon the value of the non-cash
consideration; PROVIDED that the value of any publicly traded securities shall
be deemed to be the Market Value of such securities as of the date of the
consummation of such issuance. If the Issuer and DoCoMo fail to agree on such
value during the 30-day period contemplated by the first sentence of Section
8.1(b), then the Issuer will refer the items in dispute to a nationally
recognized investment banking firm that is selected by the Board and reasonably
acceptable to DoCoMo and that shall make a final and binding determination of
the fair market value of such items within 10 days. If such a determination is
required, the deadline for DoCoMo's exercise of its Preemptive Rights with
respect to such issuance pursuant to Section 8.1(b) shall be extended until the
fifth Business Day following the date of such determination. Whichever of the
Issuer or

                                      -55-
<PAGE>

DoCoMo whose last estimate differed the most from that finally decided by the
investment banking firm shall be responsible for and pay all of the fees and
expenses of such investment banking firm. All determinations made by such
investment banking firm shall be final and binding on the Issuer and DoCoMo.

          Section 8.2 LIMITATION OF PREEMPTIVE RIGHTS. (a) Upon an Investor
Rights Termination Event, DoCoMo's Preemptive Rights shall terminate and cease
immediately including with respect to any pending but uncompleted exercises.

          (b) Anything herein to the contrary notwithstanding, DoCoMo shall not
be entitled to exercise Preemptive Rights if and to the extent AT&T or AT&T
Wireless reasonably determines that the exercise of such Preemptive Rights
would, taking into account all relevant facts in existence at the time of the
issuance to DoCoMo, create a substantial risk that such issuance would cause the
Spin-off to be taxable to AT&T or its shareholders under Section 355(e) of the
Internal Revenue Code of 1986, as amended.

                                   ARTICLE IX

                          EFFECTIVENESS AND TERMINATION

          Section 9.1 EFFECTIVENESS. This Agreement shall take effect
immediately upon the Closing and shall remain in effect until it is terminated
pursuant to Section 9.2 hereof.

          Section 9.2 TERMINATION. Other than the termination provisions
applicable to particular Sections of this Agreement that are specifically
provided elsewhere in this Agreement, this Agreement shall terminate (a) upon
the mutual written agreement of AT&T, AT&T Wireless and DoCoMo or (b) at such
time as DoCoMo no longer holds any Equity Shares.

          Section 9.3 PARTIAL TERMINATION. Effective immediately on consummation
of the Spin-off, (i) except (x) for AT&T's guarantee of a portion of AT&T
Wireless's obligations as specified in Section 4.3(f) hereof and (y) with
respect to liabilities arising from any breach of this Agreement prior to the
consummation of the Spin-off, AT&T shall be released and terminated as a party
hereto and shall have no further liability or obligation hereunder to any party
hereto or any other Person hereby, and this Agreement shall no longer represent
an agreement of AT&T enforceable against AT&T by any other Person, and (ii)
except (x) with respect to liabilities arising from any breach of this Agreement
prior to the consummation of the Spin-off, (y) as specified in Sections 3.6 and
3.7 and (z) for obligations or liabilities to AT&T relating to any obligations
or liabilities retained by AT&T pursuant to Section 4.3(f) arising hereunder as
a result of the Spin-off, no party hereto shall have any further liability or
obligation hereunder to AT&T.

                                   ARTICLE X

                        NON-COMPETITION; CONFIDENTIALITY

          Section 10.1 NON-COMPETITION RESTRICTIONS. (a) Each of AT&T and AT&T
Wireless, on the one hand, and DoCoMo, on the other, agrees with respect to
itself and with respect to each of its Subsidiaries, not to own or operate, or
acquire or increase, except pursuant

                                      -55-
<PAGE>

to existing preemptive rights, any equity interest in any Person that owns (or
has entered an agreement to acquire) or operates (or whose Affiliate owns (or
has entered an agreement to acquire) or operates) a Mobile Telecommunications
Infrastructure (as defined below) in the other party's Home Territory.

          (b) Each of AT&T and AT&T Wireless, on the one hand, and DoCoMo, on
the other, agrees with respect to itself and with respect to each of its
Subsidiaries, that it will not be a Reseller (as defined below) in the other
party's Home Territory nor will it acquire or increase, except pursuant to
existing preemptive rights, any equity interest in any Person that is, or has
entered an agreement to acquire (or whose Affiliate is (or has entered an
agreement to acquire)), a Reseller in the other party's Home Territory.

          (c) Each of AT&T and AT&T Wireless, on the one hand, and DoCoMo, on
the other, agrees with respect to itself, and with respect to each of its
Subsidiaries, not to provide any, or provide rights to any, Mobile Multimedia
Contribution (as defined below) to any Person that is (or whose Affiliate is)
engaged in any of the businesses described in Sections 10.1(a) or (b) in the
other party's Home Territory, except that DoCoMo may provide such contribution
outside of AT&T Wireless's Home Territory if the recipient thereof is bound by
non-exportation restrictions with respect to AT&T Wireless's Home Territory
similar to those imposed upon AT&T Wireless herein.

          (d) Nothing in Sections 10.1(a) or (b) shall be construed to prohibit
any party from entering into customary commercial roaming agreements.

          (e) Without limiting Sections 10.1(a), (b) or (c), for a period of 48
months from the Closing Date, each of AT&T and AT&T Wireless, on the one hand,
and DoCoMo, on the other, agrees with respect to itself, and with respect to
each of its Subsidiaries, not to provide Mobile Multimedia Contribution to any
Person that engages or intends, to the party's actual knowledge, to engage (or
whose Affiliate engages or intends, to the party's actual knowledge, to engage)
in the other party's Home Territory in the business of developing or maintaining
a Mobile Portal (as defined below). After the expiration of the 48-month period,
DoCoMo and AT&T Wireless will discuss in good faith appropriate revisions to the
restrictions on competition or the termination of such restrictions with respect
to Mobile Portals in light of the then current state of the mobile
telecommunications markets. Unless an alternate agreement is reached, after such
48-month period, DoCoMo may take any of the actions otherwise prohibited under
the first sentence of this Section 10.1(e), but only in accordance with the
Release Conditions (as defined below). After such 48-month period, AT&T and AT&T
Wireless shall no longer be subject to the restrictions contained in this
Section 10.1(e).

          Section 10.2 DEFINITIONS. (a) A Person "COMPETES" if (i) it (and/or
its Affiliate) offers products and/or services that are substantially
substitutable with products and/or services of the other party's products and/or
services by customers (including resellers) located in substantially similar
geographic locales in each party's Home Territory such that there is a
reasonable likelihood of customers (including resellers) substituting the
competing product or service, and (ii) the competing products and services,
taken together, compete for a substantial portion of the customers (including
resellers) of AT&T Wireless, the MMS or DoCoMo, as the case may be, in the
geographic locale where such competition occurs.

                                      -56-
<PAGE>

          (b) "MOBILE MULTIMEDIA CONTRIBUTION" means the provision of the
support, advice, services, activities, and technology included in Section 5.3(b)
hereof (including Schedule 5.3(b) hereto) by way of any joint venture agreement,
technology and know-how transfer agreement, services and support agreement that
has been reduced to writing or any similar type of written agreement or in any
other manner at a level that would not be considered to be DE MINIMIS.

          (c) "MOBILE PORTAL" means the provision of portal functionality by
aggregating content or providing content that includes third party content to be
supplied to consumers through a cell phone browser or other wireless access
device. Without limiting the foregoing, it is agreed and understood that the
portal functionality provided or enabled by the i-mode services is included
within the definition of Mobile Portal.

          (d) "MOBILE TELECOMMUNICATIONS INFRASTRUCTURE" means a wireless mobile
radio network to provide digital or analog voice and data transmission services
to mobile communications terminals anywhere in the relevant Home Territory,
unless such network does not have more than 100,000 subscribers and does not, or
when operational would not, cover more than 10 million POPs.

          (e) An action described herein as being permitted in accordance with
the "RELEASE CONDITIONS" will be permitted only: (i) if the written consent of
AT&T Wireless has been obtained, or (ii) if prior to taking such action all
DoCoMo representatives on the AT&T board, but not the AT&T Wireless board, and
all other DoCoMo representatives or designees appointed to the management or any
governance body or committee of the MMS (including under Section 5.4 hereof)
shall have resigned, and in each case DoCoMo shall have relinquished its right
to nominate, appoint or designate any such directors, representatives or
designees in the future. In the case of any such resignations, DoCoMo shall be
released from any and all of its obligations and duties relating to any
management, directorships or membership or participation in any such governance
body.

          (f) "RESELLER" is an Person that (i) provides mobile telecommunication
services without owning its own infrastructure but by using a third party's
Mobile Telecommunications Infrastructure, (ii) has at least 100,000 subscribers
and (iii) serves, or has the right or licenses to offer services in, an area or
areas covering at least 10 million POPs.

          Section 10.3. DURATION OF AND LIMITATIONS ON RESTRICTIONS. (a) With
respect to Sections 10.1(a), (b) and (c), DoCoMo shall be subject to the
restrictions and obligations set forth therein unless and until (i) an Investor
Rights Termination Event shall have occurred as a result of DoCoMo's exercise of
the Technology Default Right or the No Spin-off Right or a Permitted Redemption,
PROVIDED that for purposes of this clause (i) only, the reference to 60 days
appearing in the definition of Investor Rights Termination Event shall be deemed
to be a reference to 90 days, or (ii) an Investor Rights Termination Event shall
have occurred other than as a result of an event covered by clause (i) of this
sentence, PROVIDED that for purposes of this clause (ii) only, the reference to
60 days appearing in the definition of Investor Rights Termination Event shall
be deemed to be a reference to one year.

                                      -57-
<PAGE>

          (b) AT&T shall be subject to the restrictions and obligations set
forth in Section 10.1 until the earlier of the Spin-off and the first date that
DoCoMo exercises the No-Spin-off Right.

          (c) AT&T Wireless shall be subject to the restrictions and obligations
set forth in Section 10.1 until the earlier of (i) the date DoCoMo first ceases
to be subject to the restrictions and obligations set forth in Sections 10.1(a),
(b) or (c), and (ii) the date DoCoMo first relinquishes its board and management
rights in accordance with clause (ii) of the definition of Release Conditions.

          (d) AT&T's and AT&T Wireless's current investment in Japan Telecom
Co., Ltd shall not be subject to the Section 10.1 restrictions.

          (e) Nothing in the restrictions above will prohibit either party from
making any investment if the investing party (i) does not hold a beneficial
interest in the target entity in excess of 5% of any equity or management class
of shares of such target entity and (ii) does not exercise control of, or
management authority in, or provide any Mobile Multimedia Contribution to, such
target entity.

          (f) If AT&T or AT&T Wireless, on the one hand, or DoCoMo, on the
other, materially breaches any of its obligations under this Article X and fails
to cure such breach within 30 days of receiving notice from the other party or
parties, than such other party or parties shall immediately be released from all
of the restrictions hereunder.

          Section 10.4 NON-DISCLOSURE COMMITMENT. (a) AT&T Wireless and DoCoMo
each hereby agree to keep confidential and protect each other's Proprietary
Information. This will include ensuring that directors, secondees and any other
employees with access to Proprietary Information of the other party remain bound
by strict nondisclosure policies and procedures consistent with this Section
10.4, and only utilize Proprietary Information for purposes related to the
purposes for which such information was disclosed. In addition, each party
further agrees that in no case shall any Proprietary Information of the other
party be transferred in any form (including orally and visually) outside of the
respective Home Territories. "PROPRIETARY INFORMATION" shall mean any and all
information of either party of a confidential nature, including without
limitation non-public information relating to the disclosing party's technology,
technical data, trade secrets, know-how, customers, business plans, marketing
activities, financial data and other business affairs that is disclosed by one
party to the other party or that is otherwise learned by a party in the course
of its discussions or business dealings with, or its physical or electronic
access to the premises of, the other party that, if disclosed in written form,
is conspicuously marked at the time of initial disclosure, or promptly
thereafter, as the disclosing party's Proprietary Information, and, if in oral
or visual form, is promptly followed by a writing delivered to the receiving
party designating the information considered confidential; PROVIDED, HOWEVER,
that "Proprietary Information" does not include any information that: (i) was in
possession of or known to the receiving party, without any obligation of
confidentiality to the disclosing party, prior to receiving it from the
disclosing party; (ii) is, or subsequently becomes, publicly available without
breach of these confidentiality provisions; (iii) is or becomes known or
available to the receiving party from a source other than the disclosing party
that, to the receiving party's knowledge, is not prohibited from disclosing

                                      -58-
<PAGE>

such Proprietary Information to the receiving party by a contractual, legal or
fiduciary obligation owed by such other third party to the disclosing party;
(iv) is developed by or for the receiving party without use of the Proprietary
Information; (v) is or becomes available to the receiving party by lawful
inspection or analysis of products or services offered for sale; or (vi) is
disclosed to the receiving party by the disclosing party after receiving written
notification from the receiving party that does not desire to receive any
further Proprietary Information.

          (b) Section 10.4(a) notwithstanding, the terms of confidentiality
hereunder shall not be construed to in any way limit either party's right to
independently develop or acquire products, services or other information without
use of the other party's Proprietary Information. Each party acknowledges that
the other party has developed and intends to continue to develop, both
internally and with the assistance of third parties, products, services and
other information related to Mobile Portals and data networks, including
products, services and other information that may be similar to Proprietary
Information disclosed by the other party. Accordingly, nothing herein, or any
other agreement between the parties, will be construed as a representation or
agreement that the receiving party will not develop or have developed for it (or
deploy) products, services, concepts, systems or techniques that are similar to
or compete with the products, concepts, systems or techniques contemplated by or
embodied in the Proprietary Information of the other party, provided that the
receiving party does not violate any of its obligations under this Section 10.4
in connection with such development. Further, any other provision hereof or
agreement between the parties notwithstanding, both parties shall be free to use
for any lawful purpose the residuals resulting from access to or work with any
Proprietary Information, provided that such party shall maintain the
confidentiality of the Proprietary Information as provided herein. The term
"residuals" means information in non-tangible form, which may be retained by
persons who have had access to the Proprietary Information, including ideas,
concepts, know-how or techniques contained therein so long as such "residuals"
are not themselves substantially identical to the Proprietary Information on
which any such residual is based. Neither party shall have any obligation to
limit or restrict the assignment of such persons or to make payment of any kind
to the other party for any work resulting from the use of residuals.

          (c) In the event that the receiving party is requested or becomes
legally compelled to disclose any Proprietary Information, then before
substantively responding to any such request or requirement, the receiving party
will provide the disclosing party with prompt written notice of any such request
or requirement so that the disclosing party may seek a protective order or other
appropriate remedy, or both, or waive compliance with the provisions of this
Section 10.4 or other appropriate remedy, or if the disclosing party so directs,
the receiving party will exercise its own reasonable best efforts to assist the
disclosing party in obtaining a protective order or other appropriate remedy at
the disclosing party's expense. If, failing the entry of a protective order or
other appropriate remedy or the receipt of a waiver hereunder, disclosure of any
Proprietary Information is, in the opinion of the receiving party's counsel,
required, the receiving party may furnish only that portion of the Proprietary
Information which is in the opinion of the receiving party's counsel legally
required to be furnished. In any event, the receiving party will cooperate fully
with any action by the disclosing party to obtain an appropriate protective
order or other reliable assurance that confidential treatment will be accorded
the Proprietary Information.

                                      -59-
<PAGE>

          (d) The obligations and covenants contained in this Section 10.4 shall
be subject to and performed in accordance with any applicable U.S. and Japanese
laws and regulations.

                                   ARTICLE XI

                                  MISCELLANEOUS

          Section 11.1 INJUNCTIVE RELIEF. Each party hereto acknowledges that it
would be impossible to determine the amount of damages that would result from
any breach of any of the provisions of this Agreement and that the remedy at law
for any breach, or threatened breach, of any of such provisions would likely be
inadequate and, accordingly, agrees that each other party shall, in addition to
any other rights or remedies which it may have, be entitled to seek such
equitable and injunctive relief as may be available from any court of competent
jurisdiction to compel specific performance of, or restrain any party from
violating, any of such provisions. In connection with any action or proceeding
for injunctive relief, each party hereto hereby waives the claim or defense that
a remedy at law alone is adequate and agrees, to the maximum extent permitted by
law, to have each provision of this Agreement specifically enforced against it,
without the necessity of posting bond or other security against it, and consents
to the entry of injunctive relief against it enjoining or restraining any breach
or threatened breach of such provisions of this Agreement.

          Section 11.2 SUCCESSORS AND ASSIGNS. Except as and to the extent set
forth in Section 6.1(a) or Section 6.1(c), neither this Agreement nor any of the
rights, interests or obligations hereunder shall be assigned by any of the
parties hereto, in whole or in part (whether by operation of law or otherwise),
without the prior written consent of each of the other parties. Subject to the
preceding sentence, this Agreement will be binding upon, inure to the benefit of
and be enforceable by the parties and their respective successors and assigns.
Any attempted assignment in violation of this Section 11.2 shall be void.

          Section 11.3 AMENDMENTS; WAIVER. This Agreement may be amended only by
an agreement in writing executed by DoCoMo (on behalf of itself and all of its
Designees), AT&T and AT&T Wireless; PROVIDED that, after the Spin-off, this
Agreement may be amended by an agreement in writing executed by AT&T Wireless
and DoCoMo (on behalf of itself and all of its Designees) to the extent (but
only to the extent) such amendment does not affect any rights or obligations of
AT&T. Any party may waive in whole or in part any benefit or right provided to
it under this Agreement, such waiver being effective only if contained in a
writing executed by the waiving party. No failure by any party to insist upon
the strict performance of any covenant, duty, agreement or condition of this
Agreement or to exercise any right or remedy consequent upon breach thereof
shall constitute a waiver of any such breach or of any other covenant, duty,
agreement or condition, nor shall any delay or omission of any party to exercise
any right hereunder in any manner impair the exercise of any such right accruing
to it thereafter.

          Section 11.4 NOTICES. Except as otherwise provided in this Agreement,
all notices, requests, claims, demands, waivers and other communications
hereunder shall be in writing and shall be deemed to have been duly given when
delivered by hand, or if mailed, five

                                      -60-
<PAGE>

(5) Business Days after mailing (three (3) Business Days in the case of express
mail or overnight counter service), or when received by facsimile transmission
if promptly confirmed, as follows:

                  If to DoCoMo:

                               Sanno Park Tower - 41st Floor
                               11-1, Nagata-cho 2-chome
                               Chiyoda-ku,
                               Tokyo 100-6150
                               Attention:  Global Business Department,
                                            Kiyoyuki Tsujimura,
                                            Managing Director

                               Fax: 81-3-5156-0204

                  with a copy to:

                               Sullivan & Cromwell
                               1888 Century Park East
                               Los Angeles, CA  90067
                               Attention:  Alison S. Ressler
                               Fax:  (310) 712-8800

                  If to AT&T:

                               AT&T Corp.
                               295 North Maple Avenue
                               Basking Ridge, New Jersey 07920
                               Attention:  Marilyn J. Wasser
                                            Secretary and Vice President - Law
                               Fax: (908) 221-6618

                  with a copy to:

                               Wachtell, Lipton, Rosen & Katz
                               51 West 52nd Street
                               New York, NY  10019
                               Attention:  Steven A. Rosenblum

                                            David M. Silk
                               Fax:  (212) 403-2000

                                      -61-
<PAGE>

                  If to AT&T Wireless:

                               AT&T Wireless Services, Inc.
                               7277 164th Avenue, Northeast
                               Redmond, Washington 98501
                               Attention:  Greg Landis

                                            General Counsel
                               Fax: (425) 580-8050

                  with a copy to:

                               Wachtell, Lipton, Rosen & Katz
                               51 West 52nd Street
                               New York, NY  10019
                               Attention:  Steven A. Rosenblum

                                            David M. Silk
                               Fax:  (212) 403-2000

or to such other address, facsimile number or telephone as either party may,
from time to time, designate in a written notice given in a like manner.

          Section 11.5 GOVERNING LAW. This Agreement shall be governed by and
construed and enforced in accordance with the laws of the State of New York
applicable to contracts executed in and to be performed entirely within such
State, without giving effect to the conflicts of laws principles thereof that
would govern, construe or enforce the Agreement under laws other than the State
of New York.

          Section 11.6 ARBITRATION. The parties encourage the prompt and
equitable settlement of all controversies or claims between or among the parties
arising out of or relating to this Agreement, the Purchase Agreement and the
Warrant Agreement including any claim based on or arising from an alleged tort,
and agree as follows:

                  (i) Any controversy or claim arising out of or relating to the
         above-referenced Agreements ("ARBITRATION CLAIMS"), including
         Arbitration Claims arising under Article VI, shall be determined by
         arbitration in accordance with the International Arbitration Rules of
         the American Arbitration Association or any successor organization
         thereof and Title 9 of the U.S. Arbitration Act in New York, New York.

                  (ii) Within fifteen (15) days after the delivery in accordance
         with Section 11.4 hereof by any party to the other (treating AT&T and
         AT&T Wireless as one party and treating DoCoMo and all of its Designees
         as one party) of written notice of the commencement of arbitration,
         each party shall select one person to act as an arbitrator; and the two
         selected shall select a third arbitrator within fifteen (15) days of
         the second arbitrator's appointment. If the arbitrators selected by the
         parties are unable or fail to agree upon the third arbitrator, the
         third arbitrator shall

                                      -62-
<PAGE>

          be selected by the American Arbitration Association pursuant to its
          rules. Arbitration proceedings shall be conducted in the English
          language.

                  (iii) The parties shall agree upon what, if any, discovery
         shall be permitted. If the parties do not agree on the extent and form
         of discovery within ten (10) days after the appointment of the third
         arbitrator, then there shall be neither discovery nor the issuance of
         subpoenas except as otherwise expressly directed in accordance with the
         unanimous determination of the arbitrators.

                   (iv) The powers of the arbitrators to fashion remedies
         hereunder shall be no broader than the powers to award legal and
         equitable remedies available to a court, unless the parties expressly
         state elsewhere in the relevant above-referenced Agreements that the
         arbitrators may order broader or narrower legal and equitable remedies.
         The arbitrators shall not have the power to award any punitive damages,
         and each party expressly waives any claim thereto. This Section 11.6
         shall govern if any conflict arises between this Section and any other
         remedy terms in the above-referenced Agreements.

                  (v) The arbitrators shall make their award within thirty (30)
         days after the conclusion of arbitration hearings. Subject to paragraph
         (vi) of this Section 11.6, the award shall be final and binding, and
         judgment therein may be entered by any court having jurisdiction
         thereof.

                  (vi) Within thirty (30) days after receipt of any award (which
         shall not be binding if an appeal is taken hereunder), any party
         (treating AT&T and AT&T Wireless as one party and treating DoCoMo and
         all of its Designees as one party) may notify the American Arbitration
         Association of its intent to appeal to a second three-arbitrator
         tribunal, selected in the same fashion as the initial tribunal (with
         the 15-day arbitrator selection period commencing on the first Business
         Day after such notification is received by the other party). At least
         two of the three appellate arbitrators shall be former judges of state
         or federal courts. The appeal tribunal shall be entitled to adopt the
         initial award as its own, modify the initial award or substitute its
         own award for the initial award. The appeal tribunal shall not modify
         or replace the initial award except for errors of law or because of
         clear and convincing factual errors. If an appeal is taken, the award
         of the appeal tribunal shall be final and binding, and judgment may be
         entered therein by any court having jurisdiction thereof. The review by
         the appeal tribunal will be completed and its order issued within
         thirty (30) days of the final submission of the parties to the panel.

                  (vii) The parties (treating AT&T and AT&T Wireless as one
         party and treating DoCoMo and all of its Designees and as one party)
         shall equally bear the costs and fees of the arbitration, including
         court reporter expenses, and each party shall bear its own legal
         expenses.

                                      -63-
<PAGE>

                  (viii) The parties waive recourse to any court, including all
         courts in the United States and Japan, except for enforcement of this
         Section 11.6 or for enforcement of any arbitral award hereunder.

                  (ix) The duty of the parties to arbitrate any Arbitration
         Claim within the scope of this Section 11.6 shall survive the
         expiration or termination of this Agreement for any reason.

          Section 11.7 HEADINGS. The descriptive headings of the several
sections in this Agreement are for convenience only and do not constitute a part
of this Agreement and shall not be deemed to limit or affect in any way the
meaning or interpretation of this Agreement.

          Section 11.8 ENTIRE AGREEMENT. This Agreement, the Related Agreements
and the schedules and exhibits attached to any such documents constitute the
entire agreement among DoCoMo, each Designee, AT&T and AT&T Wireless with
respect to the subject matter hereof. This Agreement and the Related Agreements
supersede all prior agreements with respect to the subject matter hereof, and
supersede the Letter Agreement in its entirety.

          Section 11.9 SEVERABILITY. If any term or provision of this Agreement
or any application thereof shall be declared or held invalid, illegal or
unenforceable, in whole or in part, whether generally or in any particular
jurisdiction, such provision shall be deemed amended to the extent, but only to
the extent, necessary to cure such invalidity, illegality or unenforceability,
and the validity, legality and enforceability of the remaining provisions, both
generally and in every other jurisdiction, shall not in any way be affected or
impaired thereby.

          Section 11.10 SUBMISSION TO JURISDICTION; WAIVERS. Subject to the
provisions of Section 11.6, each of the parties (including each Designee) hereto
irrevocably agrees that any legal action or proceeding with respect to this
Agreement or for recognition and enforcement of any judgment in respect hereof,
other than with respect to any dispute subject to arbitration under Section 11.6
(but including for enforcement of the arbitration provisions contained in
Section 11.6 or any award resulting therefrom) brought by any other party hereto
or its successors or assigns shall be brought and determined only in the United
States District Court for the Southern District of New York, or in the event
(but only in the event) that such court does not have subject matter
jurisdiction over such action or proceeding, only in the courts of the State of
New York. Each of the parties hereto hereby irrevocably submits with regard to
any such action or proceeding for itself and in respect of its property,
generally and unconditionally, to the personal jurisdiction of the aforesaid
courts. Each of the parties hereto hereby irrevocably waives, and agrees not to
assert, by way of motion, as a defense, counterclaim or otherwise, in any action
or proceeding with respect to this Agreement or the transactions contemplated
hereby, (a) any claim that it is not personally subject to the jurisdiction of
the above-named courts for any reason other than the failure to serve in
accordance with Section 11.4, (b) that it or its property is exempt or immune
from jurisdiction of any such court or from any legal process commenced in such
courts (whether through service of notice, attachment prior to judgment,
attachment in aid of execution of judgment, execution of judgment or otherwise),
and (c) to the fullest extent permitted by the applicable law, that (i) the
suit, action or proceeding in such court is brought in an inconvenient forum,
(ii) the venue of such suit, action or proceeding is improper and (iii) this
Agreement, or the subject matter hereof, may not be enforced in or by such
courts.

                                      -64-
<PAGE>

          Section 11.11 WAIVER OF IMMUNITY. DoCoMo agrees that, to the extent
that it or any of its Subsidiaries or any of its property or the property of its
Subsidiaries is or becomes entitled to any immunity on the grounds of
sovereignty or otherwise based upon its status as an agency or instrumentality
of a government from any legal action, suit or proceeding or from set-off or
counterclaim relating to this Agreement from the jurisdiction of any competent
court or arbitrator, from service of process, from attachment prior to judgment,
from attachment in aid of execution, from execution pursuant to a judgment or an
arbitral award or from any other legal or arbitral process in any jurisdiction,
it, for itself and its property, and for each of its Subsidiaries and its
property, expressly, irrevocably and unconditionally waives, and agrees not to
plead or claim, any such immunity with respect to matters arising with respect
to this Agreement or the subject matter hereof (including any obligation for the
payment of money). DoCoMo agrees that the foregoing waiver is irrevocable and is
not subject to withdrawal in any jurisdiction or under any statute, including
the Foreign Sovereign Immunities Act, 28 U.S.C. ss. 1602 et seq. The foregoing
waiver shall constitute a present waiver of immunity at any time any action is
initiated against DoCoMo with respect to this Agreement or the subject matter
hereof (including any obligation for the payment of money).

          Section 11.12 WAIVER OF JURY TRIAL. Each party hereto hereby waives
any right it may have to a trial by jury in respect of any action, proceeding or
litigation directly or indirectly arising out of, under or in connection with
this Agreement or the transactions contemplated hereby.

          Section 11.13 COUNTERPARTS. This Agreement may be executed by the
parties hereto in two or more counterparts, each of which shall be deemed an
original, but all of which together shall constitute one and the same
instrument.

          Section 11.14 INTERPRETATION. When a reference is made in this
Agreement to an Article, Section, Exhibit or Schedule, such reference is to an
Article or Section of, or an Exhibit or Schedule to, this Agreement unless
otherwise indicated. The table of contents and headings contained in this
Agreement are for reference purposes only and shall not affect in any way the
meaning or interpretation of this Agreement. Whenever the words "include,"
"includes" and "including" are used in this Agreement, they are deemed to be
followed by the words "without limitation." For all purposes of this Agreement,
except as otherwise expressly provided or unless the context otherwise requires,
(a) the terms defined include the plural as well as the singular, (b) all
accounting terms not otherwise defined herein have the meanings assigned under
generally accepted accounting principles in the United States, and (c) the words
"herein," "hereof" and "hereunder" and other words of similar import refer to
this Agreement as a whole and not to any particular Article, Section or other
subdivision.

          Section 11.15 ANTI-DILUTION ADJUSTMENTS. Any references herein to any
number of shares of any class or series of stock, or any price per share with
respect to such shares, shall be appropriately adjusted, without duplication of
any other provision of this Agreement or any Related Agreement having the same
purpose, to reflect any stock split, reverse stock split, stock dividend or
distribution or similar recapitalization of such shares.

          Section 11.16 EFFECTIVENESS OF THIS AGREEMENT. The parties agree that
this Agreement shall become effective on the Closing Date immediately following
the Closing, and

                                      -65-
<PAGE>

that prior thereto, neither this Agreement nor any provision of hereof shall be
effective or binding upon any of the parties hereto (other than this Section
11.16), and each party agrees not to seek to enforce any provision of this
Agreement (other than this Section 11.16) prior to, or with respect to the
period prior to, the Closing. In the event the Purchase Agreement is terminated
without the Closing having occurred, this Agreement shall be terminated and
shall be null and void, without any liability of any party, and shall be deemed
by all parties as if it had not been executed by any of the parties.

          Section 11.17 NO THIRD PARTY BENEFICIARIES. Except as set forth in
Section 6.1(c), nothing in this Agreement, expressed or implied, is intended to
confer upon any Person, other than the parties hereto or their respective
successors (including, without limitation, each Designee and any successor to
AT&T Wireless pursuant to Section 11.18), any rights, remedies, obligations or
liabilities under or by reason of this Agreement.

          Section 11.18 SUBSTITUTION FOR AT&T WIRELESS. In the event the
Spin-off is to be effected by spinning off an entity other than AT&T Wireless,
AT&T shall cause the corporation that is the subject of the Spin-off (and that
is to be the issuer of publicly traded common stock representing the former
Wireless Group) to execute this Agreement. Upon such execution, such corporation
shall be substituted for AT&T Wireless for all purposes of this Agreement, and
all references herein and therein to AT&T Wireless Common Stock shall be deemed
to refer to the publicly traded common stock of such corporation outstanding as
of and following the Spin-off.

                                      -66-
<PAGE>

          IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed by their respective authorized officers as of the date set forth at the
head of this Agreement.

                                AT&T CORP.

                                By: /s/ C. Michael Armstrong
                                   ---------------------------------------
                                   Name:   C. Michael Armstrong
                                   Title:  Chairman and Chief Executive Officer

                                AT&T WIRELESS SERVICES, INC.

                                By: /s/ John D. Zeglis
                                   ---------------------------------------
                                   Name:   John D. Zeglis
                                   Title:  Chief Executive Officer

                                NTT DOCOMO, INC.

                                By: /s/ Keiji Tachikawa
                                   ----------------------------------------
                                   Name:   Keiji Tachikawa
                                   Title:  President and Chief Executive Officer

                    [SIGNATURE PAGE TO INVESTOR AGREEMENT]

                                      -67-
<PAGE>

          IN WITNESS WHEREOF, each Designee referred to on this page has caused
this Agreement to be duly executed by its authorized officer as of the date
indicated beneath its signature.

                                    Name of Designee #1:________________

                                    By:
                                         Name:
                                         Title:
                                         Date:

                                    Name of Designee #2:________________

                                    By:
                                         Name:
                                         Title:
                                         Date:

                 [Designee Signature Page to Investor Agreement]

<PAGE>

                                                                       EXHIBIT A
                                                                       ---------

          "Cost of Carry" means the applicable interest rate set forth on the
table below for the following time periods (expressed in days, based on a
360-day year of twelve 30-day months, except for periods of 12 months or less
which will be expressed in actual days of 365 based on a 360-day year according
to the money market convention).

                    RELEVANT PERIOD            INTEREST RATE
                    ---------------            -------------
                    90 days or less            6.477%
                    180 days                   6.348%
                    360 days                   6.336%
                    540 days                   6.563%
                    720 days                   6.475%
                    1,080 days                 6.499%
                    1,440 days                 6.673%
                    1,800 days                 6.647%
                    2,160 days                 6.758%
                    2,520 days or more         6.819%

          The interest rate that will apply to any time period between any two
points in the foregoing table will be an interpolated rate, which interpolated
rate will apply to the entire time period. As an example only: using the rate of
6.475% for 720 days and the rate 6.499% for 1,080 days, then (i) the rate for
900 days (half way between the two points) would be 6.487% (half way between the
two rates); (ii) the rate for 810 days (one quarter of the way between the two
points) would be 6.481% (one quarter of the way between the two rates); and
(iii) the rate for 990 days (three quarters of the way between the two points)
would be 6.493% (three quarters of the way between the two rates). The
applicable interest rate will be compounded over the applicable time period
based on a semi-annual bond equivalent yield using a 360-day year of twelve
30-day months, except for periods of 12 months or less which will be expressed
in actual days of 365 based on a 360-day year according to the money market
convention.

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