Document:

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                                                                     EXHIBIT 4.1

                                                 GRUPPE 3G ASSOCIATION AGREEMENT

THIS AGREEMENT is made on August 16, 2000

BETWEEN: THE PERSONS LISTED IN SCHEDULE 1

WHEREAS:

(A)  The Shareholders (or members of their respective Groups) and a third party
     entered into an Association Agreement dated 28th April 2000 (the
     "ASSOCIATION AGREEMENT") concerning the establishment of the Company as
     their joint venture vehicle for the purposes of participating in the
     Auction.

(B)  The third party has ceased to be a shareholder in the Company and,
     consequently has ceased to be a party to the Association Agreement.

(C)  The remaining Shareholders wish to record in more detail the terms of
     their relationship and to take into account of the exit of the third party
     as referred to in Recital (B).

(D)  This agreement (the "Agreement"), together with the Articles of
     Association, sets out, inter alia, the terms upon which the Company is to
     participate in the Auction (as defined hereunder); the manner in which the
     Shareholders are to provide funding to the Company; the manner in which the
     business and affairs of the Company are to be managed; and the
     relationships between Shareholders and between the Shareholders and the
     Company.

(E)  Each Guarantor has agreed to guarantee the obligations of its Guaranteed
     Shareholder under this agreement.

IT IS AGREED as follows:

1.   DEFINITIONS AND INTERPRETATION

1.1  DEFINITIONS

     In this Agreement:

     "ACCOUNT"                          means account number 0392182400 at
                                        Berliner Bank AG 10020000 (bank code);

     "ACCOUNTING PERIOD"                means the period commencing on first of
                                        January in any year and ending on
                                        December 31 in that year or such other
                                        accounting period as may be adopted by
                                        the Company;

     "ADVISORY BOARD MEMBER"            means those persons at the relevant
                                        time who were appointed by the
                                        Shareholders in accordance with the
                                        Articles of Association to the Advisory
                                        Board;

     "ADVISORY BOARD"                   means the advisory board of the Company
                                        to be established pursuant to the
                                        Articles of Association;

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     "AFFILIATE"                        Has the meaning as defined in Section 15
                                        of the German Stock Corporation Act
                                        (whereby a 50% participation qualifies
                                        as being majority owned);

     "AGREED FORM"                      in relation to any document means that
                                        document in a form agreed by the
                                        Shareholders and initialled for the
                                        purposes of identification by or on
                                        behalf of the Shareholders;

     "AGREED RATE"                      means EURIBOR plus 2% per cent. per
                                        annum;

     "ARTICLES OF ASSOCIATION"          means the Articles of Association of the
                                        Company, in the Agreed Form, adopted by
                                        the Company in accordance with clause
                                        2.2;

     "AUCTION"                          means the Auction for third generation
                                        mobile telephony spectrum licences
                                        pursuant to section 11 (4) of the German
                                        Telecommunications Act and as described
                                        in the Rulings;

     "AUTHORISED REPRESENTATIVES"       means the authorised representatives by
                                        each CEO, appointed pursuant to clause
                                        3.4(B);

     "BIDDER"                           means any bidder taking part in the
                                        Auction;

     "BUDGET"                           means from time to time the budget for
                                        the Company for each Accounting Period
                                        adopted by the Company in accordance
                                        with the Articles of Association;

     "BUSINESS"                         Means the business of the Company, as
                                        more particularly described in Clause
                                        2.1

     "BUSINESS DAY"                     means a day (other than a Saturday or
                                        Sunday) on which banks are open for
                                        business (other than solely for trading
                                        and settlement in euro) in Germany;

     "BUSINESS PLAN"                    means the business plan for the Company
                                        and OpCo for the period up to and
                                        including three years, in the Agreed
                                        Form and any subsequent or amended
                                        business plan for the Company prepared
                                        in accordance with clause 7 and adopted
                                        by the Company in accordance with the
                                        Articles of Association;

     "COMPANY"                          Means Marabu (Group 3G GmbH), a German
                                        limited company registered under HRB
                                        73714 at the Commercial Register of the
                                        local court of Charlottenburg with its
                                        registered seat in Berlin;

     "COMPULSORY OFFER"                 has the meaning set out in clause
                                        5.2(A);

     "COMPULSORY TRANSFER NOTICE"       has the meaning set out in clause 5.2(B)

     "CONTRIBUTION"                     means, in relation to a Shareholder, the
                                        proportion of the Licence Fee payable by
                                        that Shareholder to the Company, such
                                        proportion

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                                        to be equal to the Percentage Interest
                                        of that Shareholder;

     "CONTROL"                          in relation to a body corporate means
                                        the ability of a person to ensure that
                                        the activities and business of that body
                                        corporate are conducted in accordance
                                        with the wishes of that person, and a
                                        person shall be deemed to have Control
                                        of a body corporate if that person
                                        possesses or is entitled to acquire the
                                        majority of the issued share capital or
                                        the voting rights in that body corporate
                                        or the right to receive the majority of
                                        the income of that body corporate on any
                                        distribution by it of all of its income
                                        or the majority of its assets on a
                                        winding up;

     "COSTS"                            has the meaning set out in clause
                                        3.2(D);

     "CURRENT AGREED BID PRICE"         means in relation to the Licence, the
                                        amount designated in the Current CEOs'
                                        Bid Letter to be paid by the Company in
                                        respect of that Licence

     "CURRENT CEOs' BID LETTER"         means the latest of:-
                                        (i)  the Initial CEOs' Bid Letter; and
                                        (ii) the latest Revised CEOs' Bid
                                             Letter;

     "DEFAULTING CONTRIBUTOR"           has the meaning set out in clause 6.3;

     "DEPOSIT"                          means the deposit to be paid by the
                                        Company in compliance with the Rulings;

     "EURIBOR"                          Shall be set by reference to Tolerate
                                        page 248 (or any applicable substitute
                                        page).

     "EXCESS BID PRICE"                 means in relation to the Licence, the
                                        amount designated in a Revised CEOs' Bid
                                        Letter as being the price be paid by the
                                        Company in respect of the Licence as
                                        determined in accordance with clause
                                        3.5;

     "EXCESS BIDDER"                    means a Shareholder who is identified in
                                        a Revised CEOs' Bid Letter as committed
                                        to making an Excess Bid;

     "FREQUENCY BLOCK"                  means one of the abstract blocks of
                                        spectrum each comprising 2x5 MHz
                                        (paired) in the first stage of the
                                        auction and 1x5 MHz (unpaired) in the
                                        second stage of the auction, as
                                        determined under Ruling 13/2000, No.
                                        4.1;

     "GERMAN GAAP"                      means sound accounting practice
                                        according to the German Commercial Code;

     "GROUP"                            in relation to any person (the "relevant
                                        person"), means (i) the Ultimate Parent
                                        Company and Subsidiaries for the time
                                        being of the relevant person, and (ii)
                                        any Subsidiary of any such Ultimate
                                        Parent Company, provided that where used
                                        in connection with the Company the term
                                        "Group" shall mean the

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                                        Company and its Subsidiaries;

     "GUARANTEED SHAREHOLDER"           means, in respect of a Guarantor, the
                                        Shareholder listed in Schedule 1 (Part
                                        B) set opposite the name of that
                                        Guarantor or any permitted transferee of
                                        the Shares held by such Shareholder in
                                        accordance with the terms of this
                                        agreement or the Articles of
                                        Association;

     "GUARANTORS"                       means the persons listed in Column 1 of
                                        Schedule 1 (Part B);

     "INITIAL AGREED BID PRICE"         means, in relation to the Licence, the
                                        amount designated in the Initial CEOs'
                                        Bid Letter, as being the initial price
                                        to be paid by the Company in respect of
                                        the Licence;

     "INITIAL CEOs' BID LETTER"         means the initial CEOs' Bid Letter in
                                        the form as provided in Part A of
                                        Schedule 2;

     "LICENCE FEE"                      means the amount payable by the Company
                                        at the request of RegTP after the end of
                                        the Auction and before the Licence is
                                        granted;

     "LICENCE"                          means a licence for the operation of
                                        transmission paths for the offer of
                                        publicly available third generation (3G)
                                        mobile radio (UMTS/IMT-2000) services in
                                        the territory of the Federal Republic of
                                        Germany to be issued in accordance with
                                        the Rulings;

     "MANAGING DIRECTORS                means the managing director(s) of the
      (GESCHAFTSFUHRER)"                Company appointed pursuant to German
                                        law;

     "MVNO AGREEMENT"                   means any agreement entered into between
                                        the Company and any MVNO;

     "MVNO OPERATIONS"                  the business proposed to be carried on
                                        by a MVNO utilising the spectrum granted
                                        to the Company pursuant to any Licence;

     "MVNO"                             means a mobile virtual network operator
                                        utilising or proposing to utilise the
                                        Network;

     "NETWORK"                          means the Germany third generation
                                        mobile telephony network to be built,
                                        operated and developed by the Company in
                                        order to exploit the bandwidth covered
                                        by the Licence;

     "NON-EXCESS BIDDER"                means a Shareholder who did not commit
                                        to making a bid at the Excess Bid Price;

     "OpCo"                             means the 100% subsidiary of the Company
                                        and or the Holding Company (as defined
                                        in clause 2.1 (C) herein), if any, to be
                                        established pursuant to clause 2.4;

     "PERCENTAGE INTEREST"              means the number of Shares held by a
                                        Shareholder, expressed as a percentage
                                        of the total number of Shares;

     "PRE-CONDITION"                    means any pre-condition to be satisfied
                                        in order for the Company to be
                                        unconditionally granted a Licence;

     "FAIR MARKET VALUE"                in relation to any Shares means the
                                        value of

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                                        those Shares determined in accordance
                                        with Schedule 3 (Fair Market Value);

     "RegTP"                            means "Regulierungsbehorde fur
                                        Telekommunikation und Post" (the German
                                        Regulatory Authority for
                                        Telecommunications and Posts);

     "RESERVED MATTERS"                 means in any matter designated as such
                                        in the Articles of Association;

     "REVISED CEOs' BID LETTER"         means a revised CEOs' bid letter in the
                                        form as provided in Part B of Schedule
                                        2;

     "RULINGS"                          means the general administrative orders
                                        ("Allgemeinverfugungen") set forth in
                                        Ruling 13/2000 (BK-1b-98/005-1) and
                                        Ruling 14/2000 (BK-1b-98/005-2) by the
                                        President's Chamber of the RegTP dated
                                        18th February, 2000, published in the
                                        Official Journal of the RegTP No. 4/2000
                                        of 23rd February, 2000;

     "SHAREHOLDER AND/OR PARTY"         means the persons listed as such in
                                        Schedule 1 (Part A) and any other person
                                        to whom the benefit and burden of this
                                        agreement is extended pursuant to the
                                        Articles of Association;

     "SHAREHOLDER CONTRACT"             means any contract or arrangement
                                        between any Shareholder (or any member
                                        of a Shareholder's Group) and the
                                        Company (or a member of its Group) and
                                        any variations or amendments to any such
                                        contracts or arrangements;

     "SHARES"                           The shareholders' equity interests in
                                        the Company, each 50,00 Euro granting
                                        one vote;

     "STEERING COMMITTEE"               has the meaning set out in clause 3.3;

     "SUBSIDIARY"                       means a company which is under the
                                        Control of another company; and

     "ULTIMATE PARENT COMPANY"          in relation to a Shareholder means the
                                        person (if any) which is not itself
                                        subject to Control but which has Control
                                        of that Shareholder, either directly or
                                        through a chain of persons each of which
                                        has Control over the next person in the
                                        chain. In relation with Sonera 3G
                                        Holding, it is understood that the
                                        Ultimate Parent Company is Sonera
                                        Corporation Ltd.

1.2  INTERPRETATION

In construing this Agreement, unless otherwise specified:

(A)  references to clauses and schedules are to clauses of, and schedules to,
     this Agreement;

(B)  use of any gender includes the other genders;

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(C)  references to a "PERSON" shall be construed so as to include any
     individual, firm, company or other body corporate, government, state or
     agency of a state, local or municipal authority or government body or any
     joint venture, association or partnership (whether or not having separate
     legal personality);

(D)  a reference to any statute or statutory provision shall be construed as a
     reference to the same as it may have been, or may from time to time be,
     amended, modified or re-enacted except to the extent that any amendment or
     modification made after the date of this agreement would increase or alter
     the liability of any of the Shareholders under the Warranties;

(E)  references to time are to Germany times;

(F)  a reference to any other document referred to in this agreement is a
     reference to that other document as amended, varied, novated or
     supplemented (other than in breach of the provisions of this agreement) at
     any time;

(G)  headings and titles are for convenience only and do not affect the
     interpretation of this Agreement;

(H)  references to this Agreement are to the Agreement as amended from time to
     time in accordance with its provisions;

(I)  references to "EURO" or "E" shall be construed as the official EMU single
     currency; and

(J)  references herein to a Shareholder being obliged to procure that another
     person shall do something or shall not do something shall, where that
     Shareholder is able to exercise voting rights and other powers of control
     in relation to that person, be deemed to require that such Shareholder
     does so exercise such rights and powers so as to procure that such person
     does or does not do such thing, as appropriate.

1.3  SCHEDULES

     The schedules form part of this Agreement and shall have the same force
     and effect as if expressly set out in the body of this Agreement, and any
     reference to this Agreement shall include the schedules.

2.   STRUCTURE OF THE JOINT VENTURE

2.1  STRUCTURE AND BUSINESS OF THE GROUP

(A)  The business of the Company shall be:--

     (i)  to seek the grant of a Licence in accordance with the terms of the
          Rulings; and

     (ii) if a Licence is granted to the Company, to exploit the Licence in
          accordance with its terms.

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(B)  Once OpCo is established pursuant to clause 2.4, the business of OpCo,
     following the grant of a Licence to the Company, shall be to provide MVNO
     Operations pursuant to an MVNO Agreement to be entered into between the
     Company and OpCo, which MVNO Agreement will, for the avoidance of doubt,
     be on arms-length commercial terms (acknowledging that OpCo, in compliance
     with German telecommunications law and regulations, will provide
     undiscriminatory treatment to third parties).

(C)  Should tax or financial considerations applying collectively to the
     Shareholders so require or recommend the Shareholders agree to incorporate
     an intermediate holding company ("Holding Company") having the same
     shareholder structure and substantially the same corporate governance as
     the Company and to transfer to the Holding Company all the existing Shares
     in the Company.

(D)  New Articles of Association

     As soon as practicable after the date of this agreement the Shareholders
     shall procure that the Articles of Association shall be adopted by the
     Company.

2.2  PERCENTAGE INTERESTS

(A)  As at the date hereof the Percentage Interest of each Shareholder is as
     identified in Column (vii) of Part (A) of Schedule 1.

(B)  A Shareholders Percentage Interest shall be adjusted in accordance with
     clause 3.5(E).

2.3  ESTABLISHMENT OF OpCo

(A)  Immediately following the grant of a Licence to the Company, a wholly
     owned subsidiary of the Company and/or the Holding Company, (OpCo), will
     be established according to the following principles:--

     (i)   OpCo is established as an MVNO to perform the MVNO Operations;

     (ii)  OpCo enters into a MVNO Agreement with the Company in accordance with
           clause 2.3(B); and

     (iii) OpCo is named and branded in accordance with clause 2.5.

(B)  The terms of the MVNO Agreement referred to in clause 2.3(A) shall be on
     arms-length commercial terms.

2.4  BRANDING

(A)  Within 60 Business Days of the grant of a Licence to the Company the
     Shareholders shall use their respective best efforts to:

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     (i)  agree the name and brand of the Company;

     (ii) agree the name and brand of OpCo.

(B)  In the event of failure so unanimously to agree the name and brand of OpCo,
     the Shareholders will be entitled to form their own independent and
     independently branded VNOs. It being understood by the Shareholders that
     their respective trade and brand names shall not be considered for the
     purposes of clause 2.4(A) as an acceptable proposal to the other
     Shareholder, unless otherwise approved by them.

2.5  IPO AND CONVERSION INTO [AG OR KgaA]

It is the current intention of the Shareholders that there should be initial
public offering (an "IPO") of the Company and/or OpCo approximately 5 years
after the date of the award of the Licence, subject to market conditions and
commercial and technical viability. The Shareholders will use their respective
best efforts to ensure that the right of TICSA to propose the CEO of the
Company (so long as TICSA has at the time of the IPO the right to nominate the
CEO pursuant to clause 4) and certain technical decisions, shall be preserved
following an IPO (to the maximum extent permissible in accordance with all
relevant laws and listing regulations), provided that the TICSA Group's
Percentage Interest is not diluted vis a vis Sonera to any material extent as
part of the IPO and to the extent that it is permitted by the applicable laws
and regulations.

3.   REQUIREMENTS RELATING TO THE AUCTION

3.1  DEPOSITS

(A)  Each of the Shareholders have already transferred directly to the Account
     on July 17, 2000 in cleared funds for same day value, the amount (if any)
     specified in the column (vi) of Schedule 1 (being a proportion of the
     Deposit pro rata its Percentage Interest).

(B)  The Deposit (together with interest thereon), shall be repayable by RegTP
     to the Shareholders pro rata to the amounts advanced by them (being
     proportions of the Deposit pro rata their respective Percentage Interests)
     upon return of the Deposit to the Shareholders pursuant to the terms of the
     Rulings, to the extent of the amount so returned.

(C)  Where at any time the amount available to be repaid in respect of the
     Deposit is less than the total amount of the Deposit, the amount available
     shall be applied in repayment of the Deposit due to the Shareholders pro
     rata.

(D)  Where any part of the Deposit is not returned to the Company due to the
     default of the Company or any Shareholder, the return of the remainder of
     the Deposit (or any part of such remainder) to the Shareholders (or any of
     them) by the Company shall be without prejudice to any rights or
     liabilities arising

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     between the Shareholders, or between any Shareholder and the Company, in
     connection with the loss of the Deposit (or part thereof) by the Company.

(E)  If the Percentage Interests of the Shareholders vary pursuant to clause 3.5
     and a Licence is awarded to the Company, the proportion of the Deposit
     borne by each Shareholder shall be adjusted to reflect such Percentage
     Interests as so varied.

(F)  In the event that a Shareholder ceases to be Shareholder pursuant to the
     operation of clause 3.5(D)(ii), it shall be repaid the amount of the
     Deposit advanced by it.

(G)  Any amounts available to the Company to be repaid in respect of the Deposit
     shall be applied within 5 Business Days of becoming so available.

(H)  In any case, the Shareholders agree not to withdraw the bank guarantee
     before the time required in the Rules.

3.2  COSTS

(A)  Subject to clause 14 the Costs shall be borne by each Shareholder in
     accordance with its Percentage Interest. If the Percentage Interests of the
     Shareholders vary pursuant to clause 3.5(E) and a Licence is awarded to the
     Company, the Costs shall be borne by each Shareholder in accordance with
     its Percentage Interest as so varied (Provided that if a Shareholder
     ceases to be Shareholder pursuant to the operation of clause 3.5(D)(ii), it
     shall remain liable to bear an amount of the Costs incurred up to the date
     of its ceasing to be a Shareholder pro rata its original Percentage
     Interest).

(B)  The initial Costs shall be determined by the Advisory Board as soon as
     practicable.

(C)  Other than the initial Costs, as defined by the Advisory Board, a statement
     approved unanimously by the Steering Committee and signed by all members of
     the Steering Committee of the amount of the Costs at any time specified in
     the statement and of the proportion to be borne by any relevant Shareholder
     shall be conclusive (in the absence of manifest error) and binding on the
     Company and the recipient.

(D)  For the purposes of this clause "COSTS" means all actual out-of-pocket
     costs and expenses of whatsoever nature (excluding executive or management
     time, hotel, travel, subsistence and other related costs which shall be
     borne by each party) incurred by or on behalf of the Company and approved
     by the Steering Committee in connection with, in preparation for or for the
     purposes of the participation in the Auction including, without limitation,
     the fees of its legal, financial technical and consultant advisers together
     with any rents and/or other office expenses incurred by or on behalf of the
     Company.

3.3  ESTABLISHMENT OF A STEERING COMMITTEE

(A)  The Shareholders shall appoint a committee (the "STEERING COMMITTEE")
     comprising two representatives appointed by each Shareholder to which the
     Shareholders shall delegate the co-ordination and administration of the

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     Company's participation in the Auction. Each Shareholder shall nominate its
     initial members of the Steering Committee within 5 Business Days of the
     date hereof.

(B)  Meetings of the Steering Committee shall take place as frequently as
     necessary for the proper conduct of the Company's participation in the
     Auction. The quorum for meetings of the Steering Committee shall be one
     representative of each Shareholder. Unless otherwise stated in this
     Agreement, decisions of the Steering Committee shall be taken by majority
     vote of the members of the Steering Committee.

(C)  The Steering Committee may delegate any of its functions to a project team
     which shall be comprised of representatives of each Shareholder and, to the
     extent deemed necessary by the Steering Committee, third party advisers
     and consultants.

3.4  PRINCIPLES OF PROCEDURE

(A)  (i)   the Steering Committee's primary aim shall be to obtain Licence
           frequency blocks of 2x10 or 2x15 MHz paired and 1x5 MHz unpaired
           spectrum;

     (ii)  if a Licence is to be granted to the Company, the Shareholders shall
           procure that the Company will pay the outstanding part of the Licence
           Fee in order to comply with the request for such payment by RegTP;

     (iii) the Steering Committee shall authorise bids for the Licence up to the
           Current Agreed Bid Price or, if applicable, the Excess Bid Price;

     (iv)  the Steering Committee shall procure that the chief executive
           officers of each Shareholder Group (the "CEOs") are advised, as soon
           as is practicable, immediately following a Bidder making a bid in
           respect of any Frequency Block that exceeds 80% of one third of the
           Current Agreed Bid Price (a "BID NOTIFICATION"); and

     (v)   the CEOs shall, as soon as is practicable, following receipt of a Bid
           Notification meet (whether in person or by telephonic means) to
           consider increasing the Current Agreed Bid Price. If the CEOs
           unanimously agree to such an increase, a Revised CEOs' Bid Letter
           shall be completed and signed by each CEO to reflect such agreement
           and shall, immediately following such annotation, be irrevocably
           binding on each of the Shareholders.

(B)  Without prejudice to the above, the respective CEO's of the Parties shall
     also agree upon a maximum bid amount, exceeding which will have the same
     consequences for any Non-Bidding Party as if they had been diluted below
     10% pursuant to clause 3.5(C), (D) and (E).

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3.5  BIDDING IN EXCESS OF CURRENT AGREED BID PRICE

(A)  If the CEOs' are unable to reach agreement pursuant to clause 3.4(A)(v)
     the provisions of this clause 3.5 shall apply.

(B)  The CEO wishing to increase the Current Agreed Bid Price shall specify an
     Excess Bid Price and a Revised CEOs' Bid Letter shall be completed and
     signed accordingly by each CEO and shall, immediately following such
     signature, be irrevocably binding on each Shareholder.

(C)  Subject to clause 3.5(D) where (i) the Company makes a bid in the Auction
     of an amount higher than the Current Agreed Bid Price but equal or less
     than the Excess Bid Price; and (ii) on the basis of that amount bid, the
     Licence is awarded to the Company, then each Shareholder's Percentage
     Interest shall be adjusted pursuant to clause 3.5(E).

(D)  If as a result of the operation of clause 3.5(C) a Shareholder's
     Percentage Interest would be less than 10 per cent, then the Excess
     Bidder(s) must either:-

     (i)  provide, with the prior written consent of any Non-Excess Bidder,
          additional funding to the Company by way of subordinated shareholder
          debt, on an interest bearing basis at the Agreed Rate, in order for
          the Company to pay the Licence Fee in which case the Non-Excess
          Bidder's Percentage Interest shall be 10 per cent; or

     (ii) in the absence of receiving the Non-Excess Bidder's consent pursuant
          to clause 3.5(D)(i), the Excess Bidder(s) shall acquire the Non-Excess
          Bidder's Shares at a price equivalent to the nominal value of that
          Non-Excess Bidder's Shares.

(E)  The Percentage Interest of the Non-Excess Bidder shall be diluted in favor
     of the Percentage Interest of the Excess Bidder based on the following
     ratio: the sum of all License fee payments made by the Excess Bidder to
     the sum of all License Fee Payments made by the Non-Excess Bidder.
     Regardless of its existing interest or its rights under the Articles of
     Association, the Non-Excess-Bidder shall be obligated to participate and
     vote in favor of any capital increase or other corporate decision-making
     of the Company, which may be necessary from time to time to achieve the
     corporate structure as contemplated by this dilution provision.

4.   CORPORATE GOVERNANCE

4.1  ISSUES IN ADDITION TO THE ARTICLES OF ASSOCIATION, I.E., APPOINTMENT OF
     MANAGING DIRECTOR, BOARD MEMBERS, ETC.

(A)  The Company will be managed on a day-to-day basis by one or more Managing
     Directors (as the Advisory Board may unanimously agree from time to time,
     and which may, without limitation include, a chief financial officer and
     chief technical officer, as set forth

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     in subsections (D) and (E) below). If the Company has more than one
     Managing Director, one Managing Director shall be the chairman of the
     management board (Vorsitzender der Geschaftsfuhrung -- referred to herein
     as "CEO") and shall have the special rights set forth in subsection (F)
     below. For so long as TICSA's Percentage Interest is equal to or greater
     than 30 per cent (30%) it shall, subject to the consent of Sonera (such
     consent not to be unreasonably withheld or delayed), nominate the Managing
     Director (if the Company has only one Managing Director) or the CEO (if the
     Company has more than one Managing Director), provided that Sonera's
     percentage interest in the Company is equal to or greater than 20 per cent
     (20%).

(B)  The appointment, term of office, powers, duties and remuneration of the
     Managing Director as well as any rules of procedure for the management
     (Geschaftsordnung fur die Geschaftsfuhrung) will be determined by the
     Advisory Board in accordance with the Articles of Association and in
     accordance with the other provisions of this Agreement.

(C)  The sole Managing Director or the CEO (as the case may be) will have to
     the maximum extent permitted by German Law the powers and responsibilities
     conferred to him under applicable law, the Articles of Association of the
     Company and any rules of procedure for the management as resolved from
     time to time by the Advisory Board. However, it is hereby agreed in
     principle that he will be responsible for:

     (i)  the management of all activities of the Company and its subsidiaries
          and subsidiary undertakings in the conduct of the Business in
          accordance with the Business Plan;

     (ii) the general administration of the Company and its subsidiaries and
          subsidiary undertakings;

     (iii)implementation of the Business Plan; and

     (iv) provision to the Advisory Board of information relating to all major
          activities of the Company and its subsidiaries and subsidiary
          undertakings.

(D)  As long as OpCo is a wholly owned subsidiary of the Company, the CEO of the
     Company is entitled to exercise all shareholder rights in OpCo (convening
     shareholders' meetings, appointment of managing director, etc.). The
     Shareholders agree that the Articles of Association of OpCo should provide
     for a similar list of approval requirements as the Articles of Association
     of the Company.

(E)  The Advisory Board may, acting unanimously, appoint a chief financial
     officer as a further Managing Director who:

     (i)  will be responsible for the day-to-day management of the financial
          affairs of the Company and the supervision of the financial affairs of
          its subsidiaries; and

     (ii) will be proposed by the CEO.

(F)  The Advisory Board may, acting unanimously, appoint a chief technical
     officer as further Managing Director who:

                                       12
<PAGE>   13
     (i)   will, subject to clause 4.1(G), be responsible for the day-to-day
           management of the technical affairs of the Company and the
           supervision of the technical affairs of its subsidiaries and the
           implementation of the technology policies of the Company; and

     (ii)  will be proposed by the CEO.

(G)  If the Company has more than one Managing Director, the following
     provisions shall apply:

     (i)   subject to the provisions contained in this clause 4.1 and in the
           Articles of Association, the Managing Directors shall be jointly
           responsible for the management of the Company;

     (ii)  each Managing Director shall be responsible for the matters assigned
           to him by the Advisory Board;

     (iii) the CEO shall in any event be responsible for the general strategic
           planning and development and the personnel matters of the Company and
           all other matters which have not been specifically assigned to any of
           the other Managing Directors;

     (iv)  the CEO shall have the right to propose other senior employees of the
           Company subject to the consent of the other Shareholders (such
           consent not to be unreasonably withheld or delayed); and

     (v)   all Managing Directors (other than the CEO) and other senior
           employees shall report to the CEO.

(H)

     (i)   TICSA shall be entitled to propose all technical decisions to be made
           by the Company in respect of 3G infrastructure platforms and systems
           which, subject to clause 4.1(G)(ii) shall be adopted by the Advisory
           Board.

     (ii)  the adoption of the technical proposals referred to in clause
           4.1(G)(i) shall require the prior consent of Sonera, who shall only
           be permitted to withhold such consent if the technical proposals do
           not meet its economic and functional requirements for the Company
           and/or OpCo; and

     (iii) the Advisory Board shall procure that a technical working group
           comprising a representative of each Shareholder is constituted to
           administer the technical decisions made pursuant to this clause
           4.1(G).

4.2  SUPERVISORY BOARD

As and when required to comply with German Law the Shareholders shall procure
that:

(A)  the Company constitutes a supervisory board in accordance with German Law;

                                       13
<PAGE>   14
(B)  the powers of such supervisory board shall be limited to those powers which
     are mandatory under German Law; and

(C)  the composition of the supervisory board shall reflect each Shareholder's
     Percentage Interest.

5    CHANGE OF CONTROL AND ITS CONSEQUENCES

5.1  CHANGE OF CONTROL

(A)  Subject to sub-clauses (B) and (C) below, a change of Control (a "CHANGE
     EVENT") shall occur for the purposes of this agreement where:

     (i)   a person acquires Control of a Shareholder where no person previously
           had Control of that Shareholder; or

     (ii)  the Ultimate Parent Company of a Shareholder ceases to have Control
           of that Shareholder; or

     (iii) a person acquires Control of the Ultimate Parent Company of a
           Shareholder; or

     (iv)  a person who is not under the Control of the Ultimate Parent Company
           of a Shareholder acquires Control of that Shareholder; or

     (v)   a Shareholder or the Ultimate Parent Company of a Shareholder merges
           with any company or other entity (other than with another Shareholder
           or member of its Group) and, as a result of such merger, the
           Shareholder or Ultimate Parent Company (as the case may be) loses its
           control;

           in each case where the person who becomes in Control, or in case of
           subsection (v) the other company or entity, is a direct competitor of
           the other Shareholder, the Company and/or OpCo.

(B)  A body corporate (the "ACQUIRING COMPANY") is not to be treated as
     acquiring Control of another body corporate (the "TARGET COMPANY") where
     the acquiring company issues shares in itself to the shareholders of the
     target company in exchange for the shares in the target company and, after
     such exchange:

     (i)   each person who immediately before the exchange was a shareholder of
           the target company is a shareholder of the acquiring company; and

     (ii)  the shares in the acquiring company are of the same classes as were
           the shares in the target company immediately before the exchange; and

     (iii) the number of shares of any particular class in the acquiring company
           bears the same proportion to all the shares in the acquiring company
           as the number of shares of that class in the target company bore to
           all the shares in the target company immediately before the exchange;
           and

                                       14
<PAGE>   15
     (iv) the proportion of shares of any particular class in the acquiring
          company held by any particular shareholder is the same as the
          proportion of shares of that class in the target company held by him
          immediately before the exchange.

(C)  The provisions of this clause 5 shall not apply where the acquiring company
     is a Shareholder or a member of such Shareholder's Group or the
     Shareholders transfer the Shares to the Holding Company for the purposes
     stated in clause 2.3 (C) above.

5.2  CHANGE OF CONTROL UNRELATED TO AUCTION

(A)  Subject to clause 5.3, if a Change Event occurs in relation to any
     Shareholder (the "OFFERING SHAREHOLDER"), the Offering Shareholder shall be
     deemed to have offered all of its Shares (the "SPECIFIED SHARES") to the
     other Shareholder (the "RECIPIENT") on the terms and subject to the
     provisions of this clause 5.2 (the "COMPULSORY OFFER"). Such Compulsory
     Offer shall be legally binding on the Offering Shareholder, which shall be
     obliged to do its best efforts to assure this commitment under any
     appropriate legal procedure as stated under German law.

(B)  The Recipient may give notice to the Offering Shareholder ("COMPULSORY
     TRANSFER NOTICE") requiring a determination of the Fair Market Value of the
     Specified Shares.

(C)  The Shareholders shall determine or procure the determination of the Fair
     Market Value of the Specified Shares as at the date immediately prior to
     the date of the Compulsory Transfer Notice (as the case may be) without
     undue delay after the giving of the Compulsory Transfer Notice.

(D)  Within ten Business Days after the date on which the Fair Market Value of
     the Specified Shares is determined, the Recipient may indicate by written
     notice (the "ACCEPTANCE NOTICE") to the Offering Shareholder that it is
     willing to accept the Compulsory Offer pursuant to clause 5.2(A) at the
     Fair Market Value.

(E)  If the Recipient so accepts the Compulsory Offer it shall be obliged to
     formally accept the Compulsory Offer, in notarial form, and the Offering
     Shareholder and the Recipient shall be obliged to complete the purchase and
     transfer of the Specified Shares free from encumbrances and with the rights
     attaching to them as at or subsequent to the date immediately prior to the
     date of the Compulsory Transfer Notice within ten Business Days after the
     date of the Acceptance Notice, in each case in accordance with the
     Acceptance Notice and the provisions of clause 5.

(F)  Notwithstanding the above, in the case in which the following events
     occur:

     (i)  A Change Event takes place in respect of a Shareholder or its Ultimate
          Parent Company, where the person acquiring Control following such
          Change Event (or in the case of subsection 5.1(A)(v) the other company
          or entity) already holds an UMTS and/or GSM licence in Germany and
          will maintain such licence after the Change Event; and

     (ii) RegTP officially informs or recommends the Company that a Shareholder
          should cease to be a Shareholder or a member of its Group should cease
          to be a member of its Group.

                                       15
<PAGE>   16
Without prejudice to the right conferred upon the Recipient pursuant to section
5.2(A), (B), (C), (D), and (E) herein, the Offering Shareholder, subject to be
the Shareholder holding an interest less than 51% of the shares of the Company,
shall have in this case the right to sell all the Specified Shares to the
Recipient, which will have the obligation to acquire such shares or to cause a
third party to acquire them. The total price to be paid for the Specified Shares
shall be equal to the amount paid by the Offering Shareholder for such shares
should the Change Event have occurred within a period of one year after the
Licence is awarded to the Company and at Fair Market Value (as stated in the
Attached Schedule 3) should the Change Event occur after this period of one
year as referred above.

5.3  CHANGE OF CONTROL RELATED TO BIDDER-LICENSEE

(A)  The provisions of this clause 5.3 shall apply if:

     (i)   a Change Event occurs in respect of a Shareholder or its Ultimate
           Parent Company and the person acquiring Control following such Change
           Event (or in the case of subsection 5.1(A)(v) the other Company or
           entity) have been admitted as a Bidder or have been granted an UMTS
           by RegTP and remains such a Bidder-Licensee;

     (ii)  RegTP informs or recommends to the Company that a Shareholder should
           cease to be a Shareholder or a member of its Group should cease to be
           a member of its Group; or

     (iii) any Shareholder or any member of its Group fails to comply within the
           time specified therein with an order or direction communicated to it
           by RegTP,

     in each case, the affected Shareholder shall, for the purposes of this
     clause 5.3, be a "DISQUALIFIED SHAREHOLDER" and the event giving rise to
     such disqualification shall be a "DISQUALIFICATION EVENT".

(B)  Following a Disqualification Event:

     (i)   the Shareholder other than the Disqualified Shareholder, may
           immediately (or any time thereafter) acquire all (but not some only
           of) the Shares of the Disqualified Shareholder;

     (ii)  the total price to be paid for the Disqualified Shareholder's Shares
           shall be equal to the amount paid by the Disqualified Shareholder for
           such Shares or, in the event of clause 5.3(A)(ii), the total price to
           be paid for the Disqualified Shareholder's Shares shall be the price
           determined in Clause II.2 of the Irrevocable Offers (attached as
           Schedule 5 hereto); and

     (iii) the Irrevocable Offers executed by each of the Parties (attached as
           Schedule 5 herein) will be effective and enforceable.

(C)  In any case, in the event of the Disqualified Party's withdrawing from this
     Agreement in accordance with the foregoing Clauses, the provision regarding
     Bid Costs (clause 3.2), exclusivity and non-compete (clause 8),
     announcements (clause 13 (F)), confidentiality

                                       16
<PAGE>   17
(clause 13 (A), (B), (C), (D), (E)), governing law (clause 21) and disputes
(clause 20) shall survive such termination or withdrawal.

5.4  EFFECT OF TRANSFER

A person who has ceased to be a Shareholder pursuant to the operation of this
clause 5 shall cease to be a party to this Agreement save where stated to the
contrary, but shall remain liable to the Company and other Shareholders for all
amounts payable under this agreement and accrued at the date of such transfer.

6    FUNDING

6.1  PAYMENT FOR LICENCE

(A)  If RegTP determines after the close of the first stage of the Auction that
     the Company's bids were successful for at least two blocks of 2x5 MHz
     (paired) spectrum, the Shareholders shall prepare for making the payment
     within 10 business days following the Company's receipt of the written
     request for payment by RegTP.

(B)  The Shareholders shall make the payment of their pro-rata portion of the
     Licence Fee directly to the account specified by RegTP within 10 business
     days upon the Company's receipt of RegTP request for payment.

(C)  The Shareholders' obligation under clause 6.1(B) will be discharged upon
     receipt by RegTP's of cleared funds of an amount equal to the relevant
     Shareholder's Contribution payment to the Company by or on behalf of a
     Shareholder.

(D)  A Shareholder's Contribution shall (in the absence of a unanimous agreement
     of the Shareholders otherwise) be funded by a subscription for additional
     Shares of an aggregate value equal to 40% of a Shareholder's Contribution
     and the provision of Shareholder loans/funding through loss compensation
     payments of an aggregate value equal to 60% of a Shareholder's
     Contribution).

(E)  Notwithstanding the provisions of this clause 6.1, to the maximum extent
     that it is (in the unanimous opinion of the Shareholders) commercially
     viable and prudent for the Company to do so, the amount of each
     Shareholder's Contribution will be reduced, pro rata between them, through
     the provision of substitute funding by way of vendor financing.

6.2  BUSINESS PLAN FUNDING

(A)  Following the grant of a Licence to the Company the Shareholders shall from
     time to time provide funding to the Company in the proportion equal to
     their respective Percentage Interest as requested by the Company from time
     to time for working capital purposes provided that such request:--

     (i)  is in accordance with a Business Plan or Budget (as the case may be),
          and

     (ii) is made in writing specifying the amount requested and the timing of
          such payment.

                                       17
<PAGE>   18
(B)  Amounts required from any particular Shareholder pursuant to clause 6.2(A)
     shall (in the absence of a unanimous agreement of the Shareholders
     otherwise) be funded by the subscription by that Shareholder for additional
     Shares of an aggregate value equal to 40% of the amount required from it
     and the provision by that Shareholder of Shareholder loans/funding through
     loss compensation payments with an aggregate value equal to 60% of a
     Shareholder's Contribution).

6.3  CONSEQUENCES OF FAILURE TO MAKE A CONTRIBUTION

If by the time specified in clause 6.1(B) or by any later date determined by the
Advisory Board in its absolute discretion, the Company has not received the
entire Contribution payable by any Shareholder (a "DEFAULTING CONTRIBUTOR")
pursuant to clause 6.1(B), the other Shareholder:

(A)  may acquire, on a pro rata basis (unless otherwise agreed by such other
     Shareholders), the Shares of the Defaulting Contributor (or any member of
     its Group) at nominal value; or

(B)  The Percentage Interest of the Defaulting Contributor may be diluted in
     favor of the Percentage Interest of the other Shareholder(s) based on the
     following ratio: the sum of all capital contributions made by the other
     Shareholder(s) to the sum of all capital contributions made by the
     Defaulting Contributor. Regardless of its existing interest or its rights
     under the Articles of Association, the Defaulting contributor shall be
     obligated to participate and vote in favor of any capital increase or other
     corporate decision-making of the Company, which may be necessary from time
     to time to achieve the corporate structure as contemplated by this dilution
     provision; or

     It is agreed that in no event shall dilution reduce the Defaulting
     Contributor's Percentage Interest below a minimum of 10% of the total
     interest in the Company. If the dilution mechanism described above would
     trigger the dilution of the Defaulting Contributor's interest below the
     minimum of 10%, then the other Shareholder shall have a call option to
     acquire the Defaulting Contributor's shares at a price equivalent to the
     Fair Market Value of those shares.

(C)  may at its sole discretion be liable for the outstanding amount of the
     Contribution of that Defaulting Contributor and the Advisory Board shall
     notify such other Shareholder of the details of such default and such
     notice shall include a demand in writing to pay the Company by way of
     equity and a (fully subordinated) shareholder loan bearing interest at the
     Agreed Rate, within 10 Business Days of the date of such demand (or such
     shorter period as is necessary in order that the Company may meet its
     payment obligations in respect of any Licence Fee) the outstanding
     amount(s) due from the Defaulting Contributor.

     Notwithstanding the above, the decision to exercise the right stated in
     sections (A) or (B) above shall be without prejudice to the other
     Shareholders' rights or other remedies. Any other rights and remedies
     against the defaulting Contributor shall remain unaffected.

                                       18
<PAGE>   19
6.4  CONSEQUENCES OF FAILURE TO PROVIDE BUSINESS PLAN FUNDING

(A)  If a Shareholder is in breach of its obligations pursuant to clause 6.2 (a
     "NON-FUNDING SHAREHOLDER"), substitute funding may be provided by the other
     Shareholder, either by way of equity or shareholder loan. Where such
     substitute funding is provided by way of equity, the issue price for the
     relevant Shares shall be the Fair Market Value of those Shares (based on
     the assumption that they are issued).

(B)  Any other rights and remedies against the Non-Funding Shareholder shall
     remain unaffected.

7    PREPARATION AND ADOPTION OF BUSINESS PLANS AND BUDGETS

(A)  As at the date hereof the Shareholders shall adopt the Business Plan.

(B)  The Company shall instruct the CEO to submit to the Shareholders a draft
     business plan such at least thirty Business Days prior to the end of each
     Accounting Period, such draft business plan covering the three-year period
     commencing at the end of such Accounting Period. Each draft business plan
     shall include:

     (i)    business forecasts;

     (ii)   appropriate explanations of the CEOs' proposed strategy;

     (iii)  details of the assumptions used; and

     (iv)   a summary annual budget for each of the second and third Accounting
            Periods covered by the draft business plan.

(C)  The Shareholders shall use all reasonable endeavours to agree each draft
     business plan submitted in accordance with clause 7(B) with such amendments
     as they may think fit and to procure the adoption of the plan in accordance
     with the Articles of Association prior to the beginning of the period to
     which it relates.

(D)  At least thirty Business Days prior to the end of each Accounting Period,
     and in conjunction with the submission of the related Business Plan, the
     CEO shall submit to the Shareholders a draft budget for the next following
     Accounting Period. Each draft budget shall include a detailed breakdown of
     the following together with details of the material assumptions used:

     (i)    monthly revenue, operating expenses, operating results and net
            interest expenses;

     (ii)   quarterly capital expenditures and cash flow;

     (iii)  balance sheet as at the end of the relevant Accounting Period and a
            profit and loss account for that Accounting Period;

                                       19
<PAGE>   20
     (iv)  expected funding requirements and the proposed methods of meeting
           those requirements; and

     (v)   cash flow return on investment and other metrics agreed by the
           Advisory Board.

(E)  The Shareholders shall use all reasonable endeavours to agree each draft
     budget submitted in accordance with clause 7(D) with such amendments as
     they might think fit and to procure the adoption of the budget in
     accordance with the Articles of Association prior to the beginning of the
     period to which it relates.

(F)  If no budget is adopted by Shareholders in respect of an Accounting
     Period, the budget for that Accounting Period shall be the budget for the
     immediately preceding Accounting Period, subject to an increase of 10 per
     cent in all variable amounts included in that budget.

8.   NON-COMPETE COVENANT

(A)  Subject to Clause 8(B) each shareholder undertakes with the other
     shareholder that it will not and that it will procure that no member of
     its group will either alone or in conjunction with or on behalf of any
     other person, do any of the following things:-

     (i)   whilst its Percentage Interest is at least 10 per cent (a "NON
           COMPETE INTEREST"), establish, be engaged or (except as the holder of
           securities in a body corporate if such securities are listed on a
           recognised investment exchange and confer not more than [one] per
           cent of the votes which could normally be cast at a general meeting
           of the body corporate) be directly or indirectly interested in
           carrying on any other 3G business operating in Germany which requires
           access to a national or local network;

     (ii)  whilst it holds a Non Compete Interest, directly or indirectly
           solicit, in relation any person to which goods or services are or
           have been sold by the Company in the course of the Business, the
           custom of that person in respect of similar goods or services;

     (iii) whilst it holds a Non Compete Interest, directly or indirectly
           solicit or entice away from the employment of the Company any of its
           employees; nor

     (iv)  assist any other person to do any of the foregoing things.

(B)  Shareholder or any member of its Group may operate any particular service
     without breaching clause 8(A) provided that:

     (i)   the Shareholder in question has first offered the Company and/or OpCo
           (as appropriate) reasonable opportunity to agree to act as the
           network operator and/or service provider for such service (which
           offer must have been on arm's length commercial terms) and the
           Company and/or OpCo (as appropriate) shall have declined so to act as
           the network operator and/or service provider for such service (and
           Provided Always that the offering Shareholder shall not be entitled
           to exercise any of its voting rights in this respect); and

     (ii)  the relevant service is not in direct competition with any service
           carried on by the Company and/or OpCo,

                                       20
<PAGE>   21
          taking into account in any case that the Rulings prohibit a Licensee
          or its shareholders to act as service provider for another
          UMTS-Licensee.

(C)  Without prejudice to the above, it is understood and agreed by the
     Shareholders that, for so long as the Shareholders hold any shares, the
     Shareholders shall treat the Company as their sole vehicle for the
     operation, development and provision, in Germany, of telecommunication
     mobile services, particularly third generation services (UMTS), and any
     kind of future enhancement of this technology, without prejudice to which
     it is stated in clause 2.4(B) above.

     The restriction contained herein shall not affect or prohibit any
     Shareholder to establish, directly or indirectly, any mobile internet
     portal, provided that, as long as the exploitation of such internet portal
     implies that access to a UMTS network, the related contracts will be
     entered into by any such Shareholder with the Company on a priority basis,
     according to paragraph(B)(i) of this Clause.

9    EU-MERGER-CLEARANCE

     The Shareholders shall provide any notice to, or obtain the consent of, or
     clearance from any antitrust, competition or other governmental authority
     in any jurisdiction if such notice or consent or clearance is required to
     be given or obtained pursuant to applicable law in connection with the
     consummation of the transactions, abiding by the corresponding procedural
     rules.

     Should the European Commission or any other competent regulatory authority
     suggest or request explanations, modifications or undertakings in respect
     of this Agreement or any of its schedules, the Parties shall review them
     together. Neither Shareholder shall unreasonably withhold its consent for
     said explanations, modifications or undertakings.

10   DURATION OF SHAREHOLDERS AGREEMENT

(A)  This Agreement shall terminate in respect of a Shareholder upon that
     Shareholder ceasing to hold Shares but without prejudice to accrued rights
     and liabilities. Clauses 3.2, 8, 13 (A), (B), (C), (D), (E) and (F), 20 and
     21 shall continue to apply notwithstanding any such termination.

(B)  This Agreement shall terminate in respect of all Shareholders on the
     expiry of the Licence (which is currently stated to be 30 years from
     issuance of the Licence);

(C)  If no Licence is granted to the Company or the Company ceases to be
     involved in the Auction the Shareholders shall consider a resolution to
     wind up the Company and each Shareholder shall exercise the voting rights
     attaching to its Shares to vote in favour of such resolution.

(D)  Notwithstanding the outcome of the general meeting referred to in
     sub-clause (C), if no Licence is granted to the Company or the Company
     ceases to be involved in the Auction, to the extent that upon such
     winding-up the assets of the Company are insufficient to

                                       21
<PAGE>   22
     meet its liabilities and the costs of winding up the Company, each
     Shareholder shall be responsible for meeting a proportion of such
     liabilities and costs (including tax liabilities) equal to its Percentage
     Interest.

11   INTELLECTUAL PROPERTY RIGHTS

Each Shareholder undertakes with each other Shareholder that it shall provide or
procure that the applicable member of its Group shall provide to the Company
and/or OpCo such intellectual property rights exclusively owned by that
Shareholder or any member of its Group as may be required by the Company and/or
OpCo (as the case may be), as far as they need it to develop their own
activities, provided that appropriate intellectual property right agreements are
negotiated on an arms-length commercial basis in respect of such intellectual
property rights.

12   DIVIDEND DISTRIBUTION POLICY

No dividends shall be declared or paid:-

(i)   unless there are sufficient distributable reserves and cash following
      repayment of all shareholder loans;

(ii)  if to do so would be contrary to (i) any direction made unanimously by
      the Advisory Board;[or (ii) the Business Plan

(iii) if either (i) the Company has been the subject of an IPO; or (ii) five
      years have elapsed since the award of the Licence to the Company,
      whichever is the first to occur; and/or

(iv)  if such declaration or payment will breach any applicable law or
      regulation then in force and binding on the Company.

13   CONFIDENTIALITY AND PUBLIC ANNOUNCEMENTS

(A)  Without limiting the generality of any other provision of this Agreement,
     each Shareholder to this Agreement shall comply with the provisions of the
     Rulings relating to confidential information.

(B)  Each party shall treat as confidential all information obtained as a
     result of negotiating and entering into this Agreement or, in the case of
     a Shareholder, through its interest in the Company or its Business or
     assets and which relates to:

     (i)   the provisions of this Agreement;

     (ii)  the negotiations relating to this Agreement;

     (iii) the Company or its Business or assets including, without limitation,
           its conduct of the Auction and information relating to the terms of
           the proposed exploitation of any Licence granted to it; or

                                       22
<PAGE>   23
     (iv) any Shareholder or a member of its Group or their respective
          businesses or assets.

(C)  Each Shareholder shall:

     (i)  not disclose any such confidential information to any person other
          than:

          (a)  an Advisory Board Member by it or a member of its Group, or any
          of its directors or employees or directors or employees of any such
          member whose duties include the management or monitoring of the
          business of the Company and who needs to know such information in
          order to discharge his duties;

          (b)  a member of the Shareholder's Group to whom any Share is to be
          transferred pursuant to the Articles of Association;

          (c)  after any Licence has been granted to the Company, to any
          existing or prospective shareholder of the Shareholder or of any
          member of its Group provided each other Shareholder has provided its
          prior written consent to such disclosure;

          (d)  not use any such confidential information other than for the
          purposes of managing or monitoring its investment in the Company; and

          (e)  procure that any person to whom such confidential information is
          disclosed by it complies with the restrictions set out in this clause
          13 as if such person were a party to this Agreement.

(D)  Notwithstanding the previous provisions of this clause 13, any Shareholder
     may disclose such confidential information:

     (i)  if and to the extent required by law or for the purpose of any
          judicial proceedings;

     (ii) if and to the extent required by any securities exchange or regulatory
          or governmental body to which that party or any member of its Group is
          subject, wherever situated whether or not the requirement for
          information has the force of law;

     (iii)to its professional advisers, auditors and bankers; or

     (iv) if and to the extent the information has come into the public domain
          through no fault of that party.

(E)  The restrictions contained in this clause 13 shall continue to apply to
     each Shareholder (including any Shareholder who has ceased to hold Shares)
     without limit in time.

                                       23
<PAGE>   24
     (iv) any Shareholder or a member of its Group or their respective
          businesses or assets.

(C)  Each Shareholder shall:

     (i)  not disclose any such confidential information to any person other
          than:

          (a)  an Advisory Board Member by it or a member of its Group, or any
          of its directors or employees or directors or employees of any such
          member whose duties include the management or monitoring of the
          business of the Company and who needs to know such information in
          order to discharge his duties;

          (b)  a member of the Shareholder's Group to whom any Share is to be
          transferred pursuant to the Articles of Association;

          (c)  after any Licence has been granted to the Company, to any
          existing or prospective shareholder of the Shareholder or of any
          member of its Group provided each other Shareholder has provided its
          prior written consent to such disclosure;

          (d)  not use any such confidential information other than for the
          purposes of managing or monitoring its investment in the Company; and

          (e)  procure that any person to whom such confidential information is
          disclosed by it complies with the restrictions set out in this clause
          13 as if such person were a party to this Agreement.

(D)  Notwithstanding the previous provisions of this clause 13, any Shareholder
     may disclose such confidential information:

     (i)  if and to the extent required by law or for the purpose of any
          judicial proceedings;

     (ii) if and to the extent required by any securities exchange or regulatory
          or governmental body to which that party or any member of its Group is
          subject, wherever situated whether or not the requirement for
          information has the force of law;

     (iii)to its professional advisers, auditors and bankers; or

     (iv) if and to the extent the information has come into the public domain
          through no fault of that party.

(E)  The restrictions contained in this clause 13 shall continue to apply to
     each Shareholder (including any Shareholder who has ceased to hold Shares)
     without limit in time.

                                       24
<PAGE>   25
(F)  No announcement concerning this Agreement, the Company's participation in
     the Auction or any Shareholder's membership in the Company shall be made by
     any Shareholder without the prior written approval of the Shareholders
     (such consent, after the grant of a Licence to the Company, not to be
     unreasonably withheld or delayed) and no announcement shall refer to any
     Shareholder (or any member of its Connected Group) without the prior
     written approval of that Shareholder.

(G)  Notwithstanding the previous provisions of this clause 13, any Shareholder
     may, whenever practicable after consultation with the Advisory Board, make
     an announcement concerning this agreement or the Company's participation in
     the Auction if:

     (i)    required by law or for the purpose of any judicial proceedings;

     (ii)   required by the Rulings or the Regulator for any purpose connected
            with the Auction or the Company's Application; or

     (iii)  required by any securities exchange or regulatory or governmental
            body to which that party or any member of its Group is subject,
            wherever situated whether or not the requirement has the force of
            law.

(H)  The restrictions contained in this clause 13 shall continue to apply to
     each Shareholder (including any Shareholder who has ceased to hold Shares)
     without limit in time.

14.  COSTS

Other than the Costs to be paid pursuant to clause 3.2 each Shareholder shall
bear its own costs and expenses in relation to the negotiation, preparation,
execution and carrying into effect of this agreement and any Ancillary
Agreements. Any notarisation fees shall be borne equally by the Shareholders.

15.  GUARANTEES BY HOLDING COMPANIES OF THE SHAREHOLDERS

Each Guarantor hereby assumes the joint and several liability (Schuldbeitritt)
for all obligations of the Guaranteed Shareholder (or any member of the
Guaranteed Shareholder's Group to which Shares are transferred).

16.  SHAREHOLDER UNDERTAKING

Each Shareholder severally undertakes with each other Shareholder that it will
and will procure that each of the members of its Group will (where appropriate,
for any relevant period stipulated in the Rulings):

(A)  exercise its voting rights and other rights as a member of the Company in
     order (insofar as it is able to do so through the exercise of such rights)
     to give full effect to the terms of this agreement, the Articles of
     Association and the rights

                                       25
<PAGE>   26
     and obligations of the parties as set out in this agreement and the
     Articles of Association;

(B)  procure that each Advisory Board Member appointed by it from time to time
     shall (subject to his fiduciary duties to the Company) exercise his voting
     rights and other powers and authorities in order (insofar as he is able to
     do so through the exercise of such rights, powers and authorities) to give
     full effect to the terms of this agreement, the Articles of Association and
     the rights and obligations of the parties as set out in this agreement and
     the Articles of Association;

(C)  comply with each of the provisions of this agreement and the Articles of
     Association applicable to it;

(D)  comply and will procure that each member of its Group complies with each
     of the provisions of the Rulings and applicable German law;

(E)  comply with each of the conditions of any Licence or any other licence
     material to the Business, the terms of which have been notified to
     Shareholders, granted to the Company to the extent applicable to it;

(F)  procure, so far as it is able by virtue its holding of Shares and
     representation on the Advisory Board, that the Company complies with the
     terms of any Licence or any other licence material to the Business, the
     terms of which have been notified to Shareholders, granted to the Company;

(G)  upon request, promptly provide the Company with all information and
     assistance necessary for the Company to comply with each of the provisions
     of the Rulings and each of the conditions to any Licence granted to the
     Company;

(H)  not collude or otherwise manipulate or attempt to manipulate the outcome of
     the Auction with any Bidder other than the Company, and shall not disclose
     any Confidential Information to any other Bidder or obtain or seek to
     obtain any Confidential Information in relation to any Bidder other than
     the Company;

(I)  not seek to enter into any exclusive agreements in contemplation of the
     Auction which might restrict the ability of any Bidder other than the
     Company to build and operate a network efficiently or which might restrict
     their means of determining a business case; and

(J)  promptly comply with all reasonable requests for information by the Company
     for the purposes of the Auction or of compliance by the Company with the
     conditions of any Licence granted to or applied for by the Company.

                                       26
<PAGE>   27
17.  SHAREHOLDER CONTRACTS

(A)  All Shareholder Contracts shall be on terms no less favourable to the
     Company than arm's length commercial terms.

(B)  Each Shareholder undertakes to each other Shareholder not to exercise any
     rights of influence and to procure that none of its Advisory Board Member
     use any Voting Rights so as to participate in implementing any Shareholder
     Contract which is on terms less favourable to the Company (or any member of
     its Group) than arm's length commercial terms.

(C)  Each Shareholder undertakes to each other Shareholder not to, and to
     procure that no member of its Group will, enter into any Shareholder
     Contract which is on terms less favourable to the Company (or any member of
     its Group) than arm's length commercial terms.

18.  MISCELLANEOUS

(A)  In this Agreement, nothing shall be deemed to constitute a partnership
     between the Shareholders nor constitute one the agent of another in any
     manner or for any purpose whatsoever.

(B)  In the event of any ambiguity or conflict arising between the terms of this
     Agreement or the Articles of Association, the terms of this Agreement shall
     prevail as between the Shareholders to the extent of that ambiguity or
     conflict.

(C)  So far as not prohibited by law, each Shareholder undertakes to exercise
     all voting and consent rights and powers of control available to it in
     relation to the Company in good faith so as to give full effect to the
     terms and conditions of this Agreement.

(D)  No Shareholder shall assign or purport to assign or otherwise deal with any
     of its rights and obligations hereunder, except with the express prior
     written consent of the other Shareholder.

(E)  Subject as set out below, if any provision or provisions of this Agreement
     shall be found by any court, government body, anti-trust authority or
     regulatory or administrative body of competent jurisdiction to be invalid
     or unenforceable, the invalidity or unenforceability of such provision(s)
     shall be deemed to be deleted from this Agreement and the remaining
     provisions shall remain in full force and effect. The Shareholders hereby
     agree to substitute for any deleted provision(s) a valid and enforceable
     provision(s) which achieves to the greatest extent possible the economic,
     legal and commercial objectives of this Agreement. For the avoidance of any
     doubt, the Shareholders shall not be required by any provision of this
     Agreement to do (or refrain from doing) any act or thing where so doing (or
     so refraining) would contravene the provisions of any applicable law or of
     any applicable regulation issued by any competent authority; and shall not
     be regarded as having breached this Agreement by reason of not having done
     (or having refrained from doing) such act or thing. Nothing contained in
     this Agreement shall require any of the Shareholders to

                                       27
<PAGE>   28
     do anything or procure that their Group members do anything that would
     conflict with any regulatory licence or condition with which that
     Shareholder or its Group Members must comply.

(F)  The Shareholders shall at their own expense execute all such documents as
     may reasonably be required for the purpose of giving full effect to this
     Agreement.

(G)  No failure or delay on the part of any Shareholder in exercising any
     right, power or remedy hereunder shall operate as a waiver thereof nor
     shall any single or partial exercise of any right, power or remedy
     preclude any further exercise thereof or the exercise of any other right,
     power or remedy. No waiver shall be effective unless expressed in writing
     signed by or on behalf of the Shareholder granting it.

(H)  No variation of this Agreement shall be effective unless made in writing
     and signed by each of the Shareholders.

(I)  Any and all notices pursuant to this Agreement shall be in writing and
     signed by (or by some person duly authorised by) the Shareholder giving it
     and may be served by leaving it at, or sending it by registered post, air
     mail or facsimile (confirmed by registered post or air mail) or by hand to
     the address of the relevant recipient Shareholder set out below (or as
     otherwise notified from time to time hereunder). Any notice so served by
     facsimile or by hand shall be deemed to have been received on the next
     working day after the notice has, respectively, been transmitted or
     received. Any notice so served by registered post or air mail shall be
     deemed to have been received 3 working days after the notice has been
     posted. The addresses of the Shareholders for the above purpose are as
     follows:

     TICSA
     Gran Via 28
     Madrid
     Spain
     For the attention of: Mr. Fernando Panizo Arcos
     Fax no: 34 91 580 86 81

     SONERA
     Teollisuuskatu 15
     Helsinki
     Finland

     For the attention of: Ms. Nina Siitari
     Fax no: 358 204054428

(J)  This Agreement (together with its Schedules and the documents to be
     executed or adopted pursuant to it) constitutes the entire and only
     agreement between the Shareholders in relation to the subject matter and
     replaces and extinguishes all prior agreements, undertakings,
     arrangements, understandings or statements of

                                       28
<PAGE>   29
     any nature made by the Shareholders whether oral or written (and, if
     written, whether or not in draft form) with respect to such subject matter.
     Each of the Shareholders acknowledges that it is not relying on any
     statements, warranties or representations given or made by any of them in
     relation to the subject matter of this Agreement, save those expressly set
     out in this Agreement, and that it shall have no rights or remedies with
     respect to such subject matter otherwise than under this Agreement (and the
     documents executed at the same time as it or referred to in it) save to the
     extent that they arise out of the fraud or fraudulent misrepresentation of
     any Shareholder.

19.  DEADLOCK RESOLUTION MECHANISM

(A)  If a proposal is made in respect of one of the (Reserved Matters) (as set
     out in the Articles of Association) but is not approved in accordance with
     the Articles of Association, any Shareholder may give written notice to the
     other that it regards a deadlock situation as having arisen ("DEADLOCK
     NOTICE"). Only one Deadlock Notice may be served in respect of any one
     proposal.

(B)  Within seven days of the date of service of a Deadlock Notice, each
     Shareholder shall each prepare and send to the others a memorandum stating
     its understanding of the disagreement, its position in relation to the
     disagreement, its reasons for taking that position and any proposals for
     resolving the disagreement.

(C)  If within fourteen days from the date of service of a Deadlock Notice the
     Shareholders shall have failed to resolve the disagreement, the respective
     chief executive officers of each Ultimate Parent Company shall be provided
     with copies of all such memoranda and shall as soon as reasonably
     practicable meet to discuss the disagreement and use all reasonable
     endeavours to resolve it.

(D)  If a deadlock relating to any proposal made in respect of one of the
     Reserved Matters is not resolved after applying the above procedure, the
     proposal shall not proceed.

20.  ARBITRATION

All disputes arising in connection with this Agreement shall be finally settled
under the Rules of Conciliation and Arbitration of the International Chamber of
Commerce ("ICC RULES"), as in effect from time to time, by three arbitrators in
accordance with the ICC Rules. The place of arbitration shall be Berlin. The
arbitration proceedings shall be held in the English language provided that no
party shall be under any obligation to produce translations of documents
prepared in the German language. If there are more than three parties involved
in the arbitration, the Court (as defined in the ICC Rules) shall appoint all
three arbitrators, to the extent that the parties do not jointly nominate one or
more arbitrators within 30 days from the date when the Claimant's Request for
Arbitration (as defined in the ICC Rules) has been communicated to the other
parties. The chairman of the arbitral tribunal must be eligible for the office
of a judge in the Federal Republic of Germany. This arbitration

                                       29
<PAGE>   30
clause does not affect each party's right to seek injunctions or other
temporary relief before the competent state courts.

21.  CHOICE OF LAW

     This agreement is to be governed by and construed in accordance with
German law. IN WITNESS whereof the Parties or their authorised representatives
have set their hands the day and year first above written.

[Signature]

Signed by Mr. Luis Lopez-van Dam (Chief Executive Officer)
for and on behalf of
TELEFONICA
INTERCONTINENTAL S.A.

[Signature]

Signed by Ms. Nina Siitari
for and on behalf of
SONERA 3G HOLDING BV
(SONERA CORPORATION Ltd).

                                       30
<PAGE>   31
SCHEDULES

SCHEDULE 1
(PART A)
DETAILS OF SHAREHOLDERS
<TABLE>
<CAPTION>
(i)                            (ii)                     (iii)            (iv)              (v)                (vi)
NAME OF SHAREHOLDER            REGISTERED OFFICE AND    FACSIMILE NO.    E-MAIL ADDRESS    [DEPOSIT DEM]      PERCENTAGE INTEREST
                               NUMBER
<S>                            <C>                      <C>              <C>               <C>                <C>
Telefonica International       Gran Via 28, Madrid      (00) 34 91       Fernando.p        (to be completed   57.2%
SA ("TICSA")                   Spain                    5808681          anizoarcos        by German
                                                                         @telefonica.es    Lawyers)

Sonera 3G Holding B.V.         Rivium Quadrant 58,                                                            42.8%
("SONERA BV")                  2909 LC Capelle non
                               den Ijssel
                               The Netherlands
</TABLE>

                                       31
<PAGE>   32
SCHEDULE 1
(PART B)
DETAILS OF GUARANTORS
<TABLE>
<CAPTION>
(i)                            (ii)                           (iii)            (iv)              (v)
NAME OF GUARANTOR              REGISTERED OFFICE AND NUMBER   FACSIMILE NO.    E-MAIL ADDRESS    GUARANTEED SHAREHOLDER
<S>                            <C>                              <C>            <C>               <C>
Sonera Corporation Ltd         Teollisuuskatu 15                                                 SONERA BV
("SONERA CORP")                Helsinki,
                               Finland
</TABLE>

                                       32
<PAGE>   33
SCHEDULE 2

PART A
INITIAL CEOs' BID LETTER (TO BE PREPARED BY GERMAN LAWYERS)

PART B
REVISED CEOs' BID LETTER (TO BE PREPARED BY GERMAN LAWYERS)

                                       33
<PAGE>   34
SCHEDULE 3

FAIR MARKET VALUE

(A)  The "FAIR MARKET VALUE" of any Shares, other than where the Shareholders
     agree the Fair Market Value, shall be determined as follows:

     (i)  the Fair Market Value of any Shares shall be the fair market value of
          those Shares (without implying any discount for lack of control) [or,
          in the case of the clause 6.4(A), of the Shares to be issued were they
          to be issued to a third party subscriber], determined on the basis of
          a sale between a willing seller and a willing buyer on the assumption
          that the business of the Company is and will remain for the
          foreseeable future a going concern;

     (ii) subject as provided below, shall be such price as is the mean average
          of the prices certified in reasoned certificates (each a "VALUATION
          CERTIFICATE") provided by two international investment banks (each an
          "EXPERT BANK"), one Expert Bank to be appointed by the proposed
          transferor ("FIRST EXPERT BANK") and one Expert Bank to be appointed
          by the proposed transferee ("SECOND EXPERT BANK"), Provided That the
          higher of the prices so certified by the Expert Banks is within 10% of
          the lower of the prices so certified by the Expert Banks. In the case
          that the transferor doesn't comply (in time and form) with the
          appointment of its Expert Bank as required above, the Value shall be
          determined only by the transferee's Expert Bank.

     (iii)where the higher of the prices so certified by the Expert Banks is not
          within 10% of the lower of the prices so certified by the Expert
          Banks, the Expert Banks shall agree upon a third international
          investment bank ("THIRD EXPERT BANK" which shall also be deemed to be
          an Expert Bank for the remaining provisions of this Schedule) and the
          price certified by the Third Expert Bank in a Valuation Certificate
          shall be conclusive and binding on the Shareholders Provided That such
          price is within the prices certified by the First Expert Bank and the
          Second Expert Bank.

     (iv) each Expert Bank shall be instructed to issue their Valuation
          Certificates as soon as possible and in any event within 20 Business
          Days of its appointment;

     (v)  the appointing Shareholders agree that they will not unreasonably
          delay appointing the relevant Expert Banks and that, in the event of
          unreasonable delay by any Shareholder, the relevant Expert Bank may be
          appointed by the Company (and in this respect the delaying Shareholder
          shall not be entitled to exercise any of its voting rights);

     (vi) the Expert Banks shall act as experts and not as arbitrators for all
          purposes under this clause (A) (Fair Market Value);

                                       34
<PAGE>   35
     (vii)the fees of the First Expert Bank and the Second Expert Bank shall be
          borne by the Shareholder(s) obliged to appoint them, except where the
          determination of the Fair Market Value is consequent upon a change of
          control of one Shareholder in which case the Shareholder subject to
          the change of control shall bear the fees of both Expert Banks;

(B)  the fees of the Third Expert Bank shall be borne equally by the proposed
     transferor, on the one hand, and the proposed transferees, on the other
     hand, except where the determination of the Fair Market Value is consequent
     upon a change of control of one Shareholder in which case the Shareholder
     subject to the change of control shall bear the fees of the Third Expert
     Bank.

                                       35
<PAGE>   36
SCHEDULE 4

IRREVOCABLE OFFERS

                                       36
<PAGE>   37

                          IRREVOCABLE OFFER BY SONERA
                                      AND
                               PURCHASE AGREEMENT

                                    between

TELEFONICA INTERCONTINENTAL S.A. (Sociedad Unipersonal), a company incorporated
under the laws of Spain, whose registered office is at Gran Via 28, Madrid,
Spain.

                                           -- hereinafter referred to as "TICSA"

                                      and

SONERA 3G HOLDING B.V., a company incorporated under the laws of The
Netherlands whose registered office is at Rivium Quadrant 58, 2909 LC Capelle
aan den ljssel/Niederlande,

                                        -- hereinafter referred to as "SONERA"--

--TICSA and SONERA are hereinafter referred to as the "Parties" --.

Whereas, reference is made to the Shareholders' Agreement between TICSA and
SONERA concluded on [notarial deed no.  /2000] (hereinafter "Shareholders'
Agreement");

Whereas, TICSA holds 57,2% and SONERA holds 42,8% of the shares in Group 3G
GmbH, a limited liability company duly organised under German law and
registered at the local Court of Berlin-Charlottenburg under HRB 73714
(hereinafter referred to as "Company");

Whereas, SONERA desires to make an irrevocable offer to TICSA to sell and
assign all its shares in Company to TICSA.

Now, therefore, the Parties agree as follows:

                                       37
<PAGE>   38
                                       I.
                               IRREVOCABLE OFFER

1.   SONERA hereby irrevocably offers to TICSA to sell and assign all of
     SONERA's shares in Company to TICSA subject to the terms and conditions
     set forth in the Purchase Agreement contained in II.

2.   TICSA is entitled to accept this offer and to purchase SONERA's shares in
     Company subject to the terms and conditions set forth in the Purchase
     Agreement contained in II.

3.   Without prejudice to the above provision (para.2), TICSA shall have the
     right to designate a third party of its choice, which is entitled to
     accept SONERA's offer instead of TICSA and to purchase SONERA's shares in
     the Company subject to the terms and conditions set forth in the Purchase
     Agreement contained in II (hereinafter referred to as "Third Party"). For
     the avoidance of doubt, the Third Party shall assume all rights and
     obligations TICSA has under the Purchase Agreement contained in II and the
     Third Party shall be solely liable for the payment of the purchase price
     as defined para.II.2. TICSA shall notify SONERA in writing of such Third
     Party.

4.   If TICSA neither accepts this irrevocable offer nor designates a Third
     Party which is willing to accept this irrevocable offer within three (3)
     months after the Company has received the RegTP-Letter, TICSA shall be
     obliged to accept SONERA's irrevocable offer and to purchase SONERA's
     shares in the Company within 14 days upon written notice by SONERA subject
     to SONERA's interest in the Company is less than 51% and subject to the
     terms and conditions set forth in the Purchase Agreement contained in II
     (hereinafter referred to as "Put Option").

5.   This irrevocable offer can be accepted by declaration of acceptance by
     TICSA or the Third Party before a notary public in Germany or Switzerland
     if, due to a proposed or executed change of control of SONERA or its
     ultimate parent company, the Company has received written information or
     recommendation from the German Regulatory Authority for Telecommunication
     and Posts (RegTP) that RegTP will

     (i)  not admit the Company to the auction for the award of licenses for
          UMTS/IMT-2000 3G in Germany ("Auction") or

     (ii) disqualify the Company from the Auction or

                                       38
<PAGE>   39
     (iii) not grant to the Company a license for UMTS/IMT-2000 3G in Germany
           ("license") or

     (iv)  revoke the license granted to the Company (the "RegTP-Letter")

     unless SONERA ceases to be a shareholder of the Company or an enterprise
     affiliated with a shareholder within the meaning of the Stock Corporation
     Act (whereby a 50% participation qualifies as being majority owned) ceases
     to be an enterprise affiliated with such shareholder within the foregoing
     meaning. The transactions contemplated in the Purchase Agreement contained
     in II. shall become valid and binding upon delivery of the notarised
     declaration of acceptance and of the RegTP-Letter to SONERA.

                                      II.
                               PURCHASE AGREEMENT

1.   SALE AND PURCHASE

1.1  SONERA hereby sells to TICSA and TICSA hereby purchases all of SONERA's
     shares in Company in the nominal amount of EURO 7.500 and EURO 3.200 (the
     "SONERA Shares").

1.2  Any profits or losses attributable to the SONERA Shares pertaining to the
     period after the transfer becomes effective pursuant to Section 3 of this
     Purchase Agreement, shall accrue to TICSA. TICSA and SONERA undertake to
     have interim financial statements prepared as of the Effective Date (as
     defined in Section 3 of this Purchase Agreement).

2.   CONSIDERATION

2.1  TICSA shall pay to SONERA as purchase price for the SONERA Shares an amount

     (i)  equal to nominal amount of the SONERA Shares, in total EURO 10.700 (in
          words: ten thousand seven hundred EURO) if SONERA exercises its Put
          Option pursuant to Para. I.4 within a period of one year after the
          Licence is awarded, ("One Year Period") and (ii) equal to the Fair
          Market Value of the SONERA Shares (as defined in Schedule 4 of the
          Shareholders' Agreement) if, after the One Year Period, SONERA

                                       39
<PAGE>   40
          exercises its Put Option or TICSA accepts SONERA's irrevocable offer
          pursuant to Para. II.2

2.2  The purchase price shall be due on the 6th business day (hereinafter
     referred to as the "Due Date") after this Purchase Agreement has become
     valid and binding.

2.3  The purchase price shall be credited irrevocably and free of costs to a
     bank account which SONERA shall indicate before the Due Date.

3.   TRANSFER AND ASSIGNMENT

     SONERA hereby transfers the SONERA Shares to TICSA. The transfer shall
     become effective (the "Effective Date") subject to the condition precedent
     that (i) any regulatory approval necessary to execute this transfer,
     including EU merger control clearance, has been granted and (ii) SONERA has
     received full payment of the purchase price pursuant to Sections 2.1
     through 2.3 of this Purchase Agreement.

4.   REPRESENTATIONS AND WARRANTIES

     SONERA represents and warrants that as of the Effective Date the SONERA
     Shares exist, are fully paid in and are not encumbered with rights of third
     parties. Further SONERA warrants that the Company has not been engaged in
     any business activities prior to the date hereof, does not have any
     liabilities and has a net equity equal to its registered capital (after
     deduction of the formation costs in accordance with the Articles of
     Association). Otherwise all warranty claims are excluded insofar as
     permissible by law.

5.   MISCELLANEOUS

5.1  This Purchase Agreement has been executed in the English language version
     which shall be the authoritative version. This Purchase Agreement shall be
     construed in accordance with and governed by the laws of the Federal
     Republic of Germany.

5.2  The rights and obligations of TICSA and SONERA under this Purchase
     Agreement shall not be assigned or delegated to any party without the prior
     written consent of the respective other party hereto. Subject to the
     foregoing, this Purchase Agreement shall be binding upon and the Parties
     and their respectively permitted successors and assignees.

                                       40
<PAGE>   41
5.3  The section headings contained in this Purchase Agreement are for
     convenience of reference only and shall not be deemed to be a part of this
     Purchase Agreement.

5.4  TICSA and SONERA hereby agree to take or cause to be taken such further
     actions, to issue and receive such legal declarations or cause to issue or
     receive such legal declarations, to execute, deliver and file or cause to
     be executed, delivered and filed such further documents and to obtain such
     consents as may be necessary or as may be reasonably requested in order to
     fully effect the purposes, terms and conditions of this Purchase Agreement.

5.5  This Purchase Agreement shall not be modified or amended except by an
     instrument in writing signed by all the Parties to be bound thereby
     provided, however, that no notarisation or other form is required.

5.6  If provisions of this Purchase Agreement are or become void or if gaps
     should occur, this shall not affect the validity and effectiveness of the
     other provisions of this Purchase Agreement in its entirety. In such a
     case, it shall be deemed that a provision has been agreed upon ab initio,
     which, in its economical and legal content reflects or comes closest to the
     one which is void, or, with regard to a gap, which would have been agreed
     by the Parties in a reasonable way and under consideration of the content
     of this entire Purchase Agreement. Independent hereof, the Parties in such
     case are obliged to immediately agree upon such a provision in the
     necessary form.

5.7  Any dispute arising under or in connection with this Purchase Agreement,
     including any question regarding the existence, validity or termination of
     this Purchase Agreement, shall be referred to and final resolved by
     arbitration. The arbitration proceedings shall be governed by the Rules of
     Arbitration attached as Exhibit 2 to the Shareholders' Agreement.

5.8  Each Party shall pay its own expenses incident to this Purchase Agreement
     and the transactions contemplated hereunder, including all legal and
     accounting fees and disbursements. Notwithstanding the foregoing, the fees
     of the acting notary in connection with the notarisation of this Purchase
     Agreement and the declaration of acceptance shall be borne by TICSA.

                                       41
<PAGE>   42
                           IRREVOCABLE OFFER BY TICSA
                                      AND
                               PURCHASE AGREEMENT

                                    between

TELEFONICA INTERCONTINENTAL S.A. (Sociedad Unipersonal), a company incorporated
under the laws of Spain, whose registered office is at Gran Via 28, Madrid,
Spain.

                                            - hereinafter referred to as "TICSA"

                                      and

SONERA 3G HOLDING B.V., a company incorporated under the laws of The
Netherlands whose registered office is at Rivium Quadrant 58, 2909 LC Capelle
aan den Ijssel/Niederlande,

                                         - hereinafter referred to as "SONERA"-.

- SONERA and TICSA are hereinafter referred to as the "Parties"-,

Whereas, reference is made to the Shareholders' Agreement between SONERA and
TICSA concluded on [notarial deed no. /2000] (hereinafter "Shareholders'
Agreement"):

Whereas, TICSA holds 57.2% and SONERA holds 42.8% of the shares in Group 3G
GmbH, a limited liability company duly organised under German law and
registered at the local Court of Berlin-Charlottenburg under HRB 73714
(hereinafter referred to as "Company");

Whereas, TICSA desires to make an irrevocable offer to SONERA to sell and
assign all its shares in Company to SONERA subject to the terms and conditions
set forth herein.

Now, therefore, the Parties agree as follows:

                                       42
<PAGE>   43
                                       I.
                               IRREVOCABLE OFFER

1.   TISCA hereby irrevocably offers to SONERA to sell and assign all of TICSA's
     shares in Company to SONERA subject to the terms and conditions set forth
     in the Purchase Agreement contained in II.

2.   SONERA is entitled to accept this offer and to purchase TICSA's shares in
     Company subject to the terms and conditions set forth in the Purchase
     Agreement contained in II.

3.   Without prejudice to the above provision (para.2), SONERA shall have the
     right to designate a third party of its choice, which is entitled to accept
     TICSA's offer instead of SONERA and to purchase TICSA's shares in the
     Company subject to the terms and conditions set forth in the Purchase
     Agreement contained in II (hereinafter referred to as "Third Party"). For
     the avoidance of doubt, the Third Party shall assume all rights and
     obligations TICSA has under the Purchase Agreement contained in II and the
     Third Party shall be solely liable for the payment of the purchase price as
     defined para.II.2. SONERA shall notify TICSA in writing of such Third
     Party.

4.   If SONERA neither accepts this irrevocable offer nor designates a Third
     Party which is willing to accept this irrevocable offer within three (3)
     months after the Company has received the RegTP-Letter, SONERA shall be
     obliged to accept TICSA's irrevocable offer and to purchase TICSA's shares
     in the Company within 14 days upon written notice by TICSA subject to
     TICSA's interest in the Company is less than 51% and subject to the terms
     and conditions set forth in the Purchase Agreement contained in II.
     (hereinafter referred to as "Put Option").

5.   This irrevocable offer can be accepted by declaration of acceptance before
     a notary public in Germany or Switzerland if, due to a proposed or executed
     change of control of TICSA or its ultimate parent company, the Company has
     received written information or recommendation from the German Regulatory
     Authority for Telecommunication and Posts (RegTP) that RegTP will

     (i)    not admit the Company to the auction for the award of licenses for
            UMTS/IMT-2000 3G in Germany ("Auction") or

     (ii)   disqualify the Company from the Auction or

                                       43
<PAGE>   44
     (iii)  not grant to the Company a license for UMTS/IMT-2000 3G in Germany
            ("license") or

     (iv)   revoke the license granted to the Company

     (the "RegTP-Letter")

     unless TICSA ceases to be a shareholder of the Company or an enterprise
     affiliated with TICSA within the meaning of the Stock Corporation Act
     (whereby a 50% participation qualifies as being majority owned) ceases to
     be an enterprise affiliated with TICSA within the foregoing meaning.

6.   The transactions contemplated in the Purchase Agreement contained in II.
     shall become valid and binding upon delivery of the notarised declaration
     of acceptance and of the RegTP-Letter to TICSA.

                                      II.
                               PURCHASE AGREEMENT

1.   SALE AND PURCHASE

1.1  TICSA hereby sells to SONERA and SONERA hereby purchases all of TICSA's
     shares in Company in the nominal amount of EURO 9.500, EURO 4.300 and EURO
     500 (the "TICSA Shares").

1.2  Any profits or losses attributable to the TICSA Shares pertaining to the
     period after the transfer becomes effective pursuant to Section 3 of this
     Purchase Agreement, shall accrue to SONERA. SONERA and TICSA undertake to
     have interim financial statements prepared as of the Effective Date (as
     defined in Section 3 of this Purchase Agreement).

2.   CONSIDERATION

2.1  SONERA shall pay to TICSA as purchase price for the TICSA Shares an amount
     (i) equal to nominal amount of the TICSA Shares, in total EURO 14.300 (in
     words: fourteen thousand three hundred EURO) if TICSA exercises its Put
     Option pursuant to Para.I.4 within a period of one year after the Licence
     is awarded to the Company

                                       44
<PAGE>   45
     ("One Year Period") and (ii) equal to the Fair Market Value of the TICSA
     Shares (as defined in Schedule 4 of the Shareholders Agreement) if, after
     One Year Period, SONERA accepts TICSA's irrevocable offer pursuant to
     Para.II.2. or TICSA exercises its Put Option after the above referred
     period.

2.2  The purchase price shall be due on the 6th business day (hereinafter
     referred to as the "Due Date") after this Purchase Agreement has become
     valid and binding.

2.3  The purchase price shall be credited irrevocably and free of costs to a
     bank account which TICSA shall indicate before the Due Date.

3.   TRANSFER AND ASSIGNMENT

     TICSA hereby transfers the TICSA Shares to SONERA. The transfer shall
     become effective (the "Effective Date") subject to the condition precedent
     that and (i) TICSA has received full payment of the purchase price pursuant
     to Sections 2.1 through 2.3 of this Purchase Agreement and (ii) any
     regulatory approval necessary to execute this transfer, including German or
     EU merger control clearance, has been granted.

4.   REPRESENTATIONS AND WARRANTIES

     TICSA represents and warrants that as of the Effective Date the TICSA
     Shares exist, are fully paid in and are not encumbered with rights of third
     parties. Further TICSA warrants that the Company has not been engaged in
     any business activities prior to the date hereof, does not have any
     liabilities and has a net equity equal to its registered capital (after
     deduction of the formation costs in accordance with the Articles of
     Association). Otherwise all warranty claims are excluded insofar as
     permissible by law.

5.   MISCELLANEOUS

5.1  This Purchase Agreement has been executed in the English language version
     which shall be the authoritative version. This Purchase Agreement shall be
     construed in accordance with and governed by the laws of the Federal
     Republic of Germany.

5.2  The rights and obligations of SONERA and TICSA under this Purchase
     Agreement shall not be assigned or delegated to any party without the prior
     written consent of the respective other party hereto. Subject to the
     foregoing, this Purchase Agreement shall be binding upon the Parties and
     their respectively permitted successors and assignees.

                                       45
<PAGE>   46
5.3  The section headings contained in this Purchase Agreement are for
     convenience of reference only and shall not be deemed to be a part of this
     Purchase Agreement.

5.4  SONERA and TICSA hereby agree to take or cause to be taken such further
     actions, to issue and receive such legal declarations or cause to issue or
     receive such legal declarations, to execute, deliver and file or cause to
     be executed, delivered and filed such further documents and to obtain such
     consents as may be necessary or as may be reasonably requested in order to
     fully effect the purposes, terms and conditions of this Purchase Agreement.

5.5  This Purchase Agreement shall not be modified or amended except by an
     instrument in writing signed by all the Parties to be bound thereby
     provided, however, that no notarisation or other form is required.

5.6  If provisions of this Purchase Agreement are or become void or if gaps
     should occur, this shall not affect the validity and effectiveness of the
     other provisions of this Purchase Agreement in its entirety. In such a
     case, it shall be deemed that a provision has been agreed upon ab initio,
     which, in its economical and legal content reflects or comes closest to the
     one which is void, or, with regard to a gap, which would have been agreed
     by the Parties in a reasonable way and under consideration of the content
     of this entire Purchase Agreement. Independent hereof, the Parties in such
     case are obliged to immediately agree upon such a provision in the
     necessary form.

5.7  Any dispute arising under or in connection with this Purchase Agreement,
     including any question regarding the existence, validity or termination of
     this Purchase Agreement, shall be referred to and final resolved by
     arbitration. The arbitration proceedings shall be governed by the Rules of
     Arbitration attached as Exhibit 2 to the Shareholders' Agreement.

5.8  Each Party shall pay its own expenses incident to this Purchase Agreement
     and the transactions contemplated hereunder including all legal and
     accounting fees and disbursements. Notwithstanding the foregoing, the fees
     of the acting notary in connection with the notarisation of this Purchase
     Agreement and the declaration of acceptance shall be borne by SONERA.

                                       46
<PAGE>   47
                                                       Dated
                                                             -------------------

                            ARTICLES OF ASSOCIATION

                                       OF

                                 GROUP 3G GMBH

                                       47
<PAGE>   48
                                   SECTION 1
                       COMPANY NAME, SEAT, BUSINESS YEAR

I.   The Company is a private limited company under German law; the name of the
     Company is:

                                 Group 3G GmbH

II.  Seat of the Company is Berlin.

III. The fiscal year begins on October 1 and ends on September 30 of the
     following year. The first business year is a short business year and ends
     on September 30, 2000.

IV.  The term of existence of the Company shall be perpetual.

                                   SECTION 2
                            PURPOSE OF THE COMPANY

I.   The purpose of the Company shall be the setting up and the operation of a
     telecommunication network in Germany under the condition of the granting
     of a license thereto, as well as the rendering of telecommunication
     services in relation to the operation of the network and other businesses
     related thereto.

II.  The Company may acquire shares in other businesses with the same or
     similar object: it may establish domestic and foreign branches and carry
     on any and all transactions which are deemed appropriate to further the
     Company's purpose.

                                   SECTION 3
                     NOMINAL CAPITAL, CAPITAL CONTRIBUTIONS

I.   The Company's nominal capital is EURO 25,000.00.

II.  The following shareholders hold a participation in the nominal capital:

     o   Telefonica InterContinental S.A., Madrid,     EURO 9,500.00
         Spain ("Ticsa")
                                                       EURO   500.00

                                       48
<PAGE>   49
                                                            EURO      4,300.00
                                                                     ---------
                                                  TOTAL     EURO     14,300.00

     o    Sonera 3G Holding B.V., Capelle aan               EURO      7,500.00
          den Ijssel, The Netherlands ("Sonera
          BV")

                                                            EURO      3,200.00
                                                                     ---------
                                                  TOTAL     EURO     10,700.00

                                   SECTION 4
                        MANAGING DIRECTORS AND AUTHORITY

I.   The Company shall have one or several Managing Directors (Geschaftsfuhrer).

II.  If only one Managing Director has been appointed, he shall be the sole
     representative of the Company. If several Managing Directors have been
     appointed, the Company shall be represented by two Managing Directors or by
     one Managing Director together with an agent of the Company ("Prokurist").
     Individual Managing Directors can be given sole power of representation in
     this case as well. The Company's advisory board can, either generally or in
     the individual case, exempt a Managing Director from the restrictions of
     Section 181 BGB (German Civil Code).

III. The Company's advisory board shall be responsible for the appointment and
     removal of Managing Directors as well as for concluding, amending,
     terminating and rescinding of employment contracts with the Managing
     Directors and for determining the remuneration of any Managing Directors.
     The appointment and/or removal as well as the determination of the
     remuneration of any Managing Director shall require prior approval by an
     advisory board resolution with a 75% majority vote.

IV.  Advisory board members appointed by TICSA shall have the sole right to
     nominate candidates for the Managing Directors as long as TICSA maintains
     more than 30% of the registered share capital. The candidates nominated by
     TICSA shall be appointed subject to approval of the advisory board members
     appointed by the other shareholders, such approval not to be unreasonably
     withheld or delayed.

                                       49
<PAGE>   50
                                   SECTION 5

                         RIGHTS AND DUTIES OF MANAGERS

I.   The rights and duties of Managing Directors arise out of the law, the
     Articles of Association, employment contracts and in some cases out of the
     standing rules to be passed by the shareholders' meeting.

II.  The following management acts shall require prior approval by an advisory
     board resolution with a 75% majority vote:

     1.   the application for changes to the license;

     2.   the sale by the Company in any given six-month period of any material
          assets (other than assets sold in the ordinary course of business)
          with an aggregate value exceeding EURO 500,000;

     3.   the purchase of any asset or assets within any given six-month period
          which purchase (a) is not specified in the annual budget and (b) has
          an aggregate value exceeding EURO 1,500,000;

     4.   the purchase of any asset which purchase (a) is specified in the
          annual budget and (b) has an aggregate value exceeding EURO 10
          million;

     5.   the approval of each annual budget;

     6.   the approval of the first business plan and any material revisions to
          the business plan. In particular, a revision of the business plan
          shall be deemed material in each case if it would require investments
          exceeding the then current annual budget by [10%];

     7.   the establishment or acquisition by the Company of any subsidiaries
          not specified in the business plan;

     8.   the formation of a strategic alliance by the Company;

     9.   the issuing and withdrawing of commercial powers of attorney
          ("Prokuren und Handlungsvollmachten").

III. The following management acts shall require prior approval by an advisory
     board resolution with a 90% majority vote:

                                       50
<PAGE>   51
     1.   any borrowing or other incurrence of indebtedness which exceeds in the
          aggregate in any given calendar year of EURO 5 million, provided that
          such borrowing or other indebtedness was not specified in the annual
          budget;

     2.   a pledge of security of any equity interest of the Company, any
          company asset or assets to secure any borrowing which exceeds in the
          aggregate in any given calendar year EURO 5 million provided that such
          pledge or security was not contemplated in the annual budget;

     3.   any transaction or series of transactions with (i) any shareholder or
          (ii) an affiliate of any shareholder, when the aggregate value of such
          transactions during any given six-month period exceeds EURO 100,000
          and if not specified in the business plan or the annual budget;

     4.   other than in accordance with any duly approved business plan, the
          issuance by the Company of convertible bonds, bonds or other
          securities or instruments with preemptive rights to acquire shares in
          the Company, options, warranties or other instruments convertible into
          equity.

                                   SECTION 6

                            SHAREHOLDER RESOLUTIONS

I.   Shareholder resolutions shall be made in the shareholders' meeting pursuant
     to section 9 of these Articles of Association or pursuant to para. II of
     this section.

II.  All shareholder resolutions required by these Articles of Association or by
     law, with the exception of resolutions and amendments to these Articles of
     Association listed in section 6 para.III no.2 below, can be made upon
     request of the chairperson of the advisory board in writing, by telex,
     telegram or by facsimile as long as no shareholder objects. The chairperson
     shall prepare a record of such resolutions and send it to the shareholders.
     The record shall be deemed as approved if no written objection is received
     by the chairperson within two weeks after receipt of the record.

III. Shareholder resolutions on the following matters require a majority of at
     least 75% of the votes cast:

     1.   any changes to the Articles of Association of the Company;

     2.   any changes to the name of the Company;

     3.   the Company's transformation, merger, consolidation, or division.

                                       51
<PAGE>   52
IV.  Shareholders' resolutions on the following matters require a majority of
     at least 90% of the votes cast:

     1.   any increase or decrease of the registered capital of the Company;

     2.   liquidation or winding-up of the Company; or

     3.   the appointment of the audit of the Company.

V.   Each Euro 50.00 of a share shall grant one vote.

VI.  Shareholder resolutions can only be challenged by filing suit or
     initiating proceedings before the agreed upon arbitration court within
     four weeks. In cases of resolutions of a shareholders' meeting, the time
     period is measured as of the date of the resolution; in cases of para. II,
     the time period is measured as of the date upon which the record of the
     resolution is entered.

                                   SECTION 7

                             SHAREHOLDERS' MEETING

I.   Convening of meetings and formalities

     1.   The ordinary shareholders' meeting is held once a year, if possible
          within the first eight months after the end of the fiscal year or
          within a shorter time period set by statute. The Managing Director
          shall convene the meeting. All shareholders shall be invited in
          writing to the meeting. The invitations shall be made within a
          two-week time period with simultaneous notification of the meeting
          location, time of day, and agenda. The date of sending shall be
          determinative for the timeliness of the invitations if prior
          notification has been made by telefax, otherwise the receipt of the
          invitation shall be determinative. If all shareholders consent, these
          formal requirements can be waived. All advisory board members shall be
          informed of the complete invitation at the same time and in the same
          manner.

     2.   An extraordinary shareholders' meeting shall be convened if a
          shareholders' resolution is necessary, if the meeting is being
          convened for some other reason that is in the interest of the Company;
          or if so requested by a shareholder. The meeting shall be convened by
          the chairperson of the advisory board. The remaining rules concerning
          the convening and holding of an ordinary shareholders' meeting shall
          apply accordingly.

                                       52
<PAGE>   53
     3.   If the chairperson of the advisory board does not pursue a
          shareholders' application for convening a shareholders' meeting within
          one month of receipt of such application, then the shareholder
          requesting the meeting shall be entitled to convene the shareholders'
          meeting itself, provided that it holds at least 10% of the registered
          share capital. In such a case, no. 1 sentences 3 through 7 shall apply
          accordingly. If more than one shareholder have requested the meeting,
          the preceding sentences of this subpara. 3 shall apply, provided that
          these shareholders hold together at least 10% of the registered share
          capital.

     4.   Every shareholder is entitled to a proxy in the shareholders' meeting
          by an officer or a member of the body or by an officer or member of
          the body of one of its shareholders, another shareholder or by a
          person bound by law to professional confidentiality. Where the proxy
          is not a member of the body of a shareholder, he or she must present a
          written power of attorney prior to the start of the shareholders'
          meeting which shall be entered into the record.

     5.   The chairperson of the advisory board shall preside over the
          shareholders' meeting. In the event the chairperson is prevented from
          doing so, the vice chairperson shall preside over the shareholders'
          meeting.

     6.   Minutes shall be kept of the shareholders' meeting and the resolutions
          passed therein. The minutes shall be signed by the chairperson and
          shall be provided to all shareholders without delay. The minutes shall
          be deemed approved if within two weeks no written objections are
          received by the chairperson.

     7.   Shareholders' meetings shall be held at the seat of the Company in its
          business offices insofar as the shareholders have not unanimously
          decided otherwise in the individual case.

                                       53
<PAGE>   54
II.  Quorum

     1.   The shareholders' meeting shall only have a quorum if 75% of the
          available votes are present or are represented by proxy.

     2.   If the meeting was not properly convened, resolutions can only be
          adopted if the shareholders affected by the improper procedures are
          present or represented by proxy and do not object to the resolution.

III. Competence

     1.   The shareholders' meeting shall be competent for passing resolutions
          concerning all matters assigned to it by law or by these Articles of
          Association.

     2.   The ordinary shareholders' meetings shall pass resolutions
          concerning in particular:

          a.   determination of the annual statement of accounts,

          b.   use and distribution of annual net earnings,

          c.   exoneration (Entlastung) of management and the advisory board,

          d.   appointment of the auditor.

                                   SECTION 8

                                 ADVISORY BOARD

I.   Appointment of the Advisory Board

     1.   The Company shall have an advisory board consisting of four members.

     2.   The members of the advisory board shall be appointed and removed by
          the shareholders. A participation of 25% of the registered share
          capital shall entitle to appoint one member and a substitute member
          to the advisory board. Shareholders can jointly appoint one member if
          their shares amount to 25% of the registered share capital in total.
          Resolutions of the supervisory board shall be adopted according to
          the participation percentage of the shareholder who has appointed the
          advisory board member or the replacement member or proxy respectively.

                                       54
<PAGE>   55
     3.   a.   Shareholders entitled to appoint a member to the advisory board
               shall also be entitled at any time to remove a member whom they
               have appointed.

          b.   Members of the advisory board shall be appointed for a term of
               three years. They can be reappointed. However, their term shall
               not end prior to a new appointment or a reappointment. If a
               member of the advisory board is prematurely removed, or if he
               resigns from the advisory board, the appointing shareholder or
               group of shareholders shall be entitled to appoint a new member
               of the advisory board and must appoint such member without delay.

     4.   A person cannot be a member of the advisory board if:

          a.   he is a Managing Director or employee of the Company;

          b.   he is an organ or employee of an enterprise in which the Company
               holds a substantial number of shares; such a substantial
               participation shall be assumed where the Company holds --
               directly or indirectly -- more than a one-quarter interest.

     5.   The regulations of the advisory board members apply accordingly to the
          replacement members.

II.  Organization of the Advisory Board

     1.   The advisory board shall have a chairman and a vice chairman each of
          whom shall be appointed by the advisory board for a term of three
          years.

     2.   The advisory board shall meet at least three times each fiscal year.

     3.   The advisory board shall adopt resolutions in meetings to be called by
          the chairman or, in the event he is prevented therefrom, by the vice
          chairman, together with the agenda and other written documents that
          might be important for the resolution. An invitation period of
          fourteen days shall be observed. The Managing Directors are obligated
          to attend the meetings and to provide all requested information;
          however, they do not have an own right of attendance.

     4.   Each member of the advisory board or management can upon stating the
          purpose and the reason request the advisory board chairman to call an
          immediate meeting of the advisory board. The meeting shall take place
          within two weeks after the meeting has been called.

                                       55
<PAGE>   56
     5.   The advisory board shall have a quorum if its members have been duly
          invited and if all members are present or represented. If an advisory
          board member is absent or is not represented by his replacement
          member, he can authorize in writing another member of the advisory
          board to cast his vote. In all other aspects, Section 7 para. II no. 2
          applies accordingly.

     6.   The advisory board adopts its resolutions with a majority of 75%.

     7.   If no member of the advisory board objects, the chairman can order
          that votes can be cast in writing, by telex, by telegraph, by fax or
          by telephone. The provision in the aforementioned no. 6 also applies
          to the adoption of a resolution in the procedure pursuant to no. 7.

     8.   Legally relevant manifestations of the advisory board's intent shall
          be given by the chairman or, in the event he is prevented therefrom,
          by his proxy.

     9.   Minutes shall be made of the advisory board meetings and of the
          resolutions adopted during those meetings. The minutes shall be signed
          by the chairman and shall be immediately sent to all advisory board
          members.

     10.  The advisory board shall be entitled to adopt its own procedural
          rules.

     11.  The advisory board members shall be reimbursed for their travel
          expenses and other expenses they may have in connection with attending
          the advisory board meeting. Otherwise, the members shall receive no
          remuneration for their activities as an advisory board member.

     12.  The provisions of the Stock Corporation Act (Aktiengesetz) shall not
          apply to the advisory board.

III.  TASKS OF THE ADVISORY BOARD

     1.   The advisory board shall advise the Company's management. It shall
          especially be entitled to inspect and examine the books and documents
          of the Company at any time as well as the assets, namely the accounts
          of the Company, the cash of the Company and the inventory of
          securities and goods. It can also commission individual advisory board
          members or, for certain tasks, special experts. Irrespective of the
          aforementioned possibility of information, the management shall
          provide a written report to the advisory board by the end of each
          month regarding the development of the Company, the form of which
          shall be determined by the advisory board.

                                       56
<PAGE>   57
     2.   In addition, the advisory board shall have the tasks assigned to it in
          these Articles of Association.

     3.   Actions of management vis-a-vis third parties and the conducting of
          the day-to-day business shall not be an advisory board task as long as
          these are not expressly assigned to it by these Articles of
          Association. However, the advisory board shall be competent to rule on
          disputes between the Managing Directors.

     4.   The chairperson of the advisory board shall convene an extraordinary
          shareholders' meeting if the welfare of the Company so requires.

     5.   Vis-a-vis the Managing Directors, the advisory board shall represent
          the Company in and out of court.

     6.   The advisory board shall be entitled to supplement or amend the list
          of the transactions requiring approval pursuant to Section 5.

                                   SECTION 9

                                ANNUAL ACCOUNTS

I.   Within three months from the end of the fiscal year, management shall
     prepare a balance sheet with a profit and loss statement for the prior
     fiscal year as well as a status report. The balance sheet shall be
     presented to the accounts auditor for auditing within a time period that is
     reasonable under accepted business practices.

II.  Immediately upon completion of the annual balance sheet and the auditors'
     report, the Managing Directors shall provide these -- together with
     management's recommendation for use of the profits -- to the shareholders
     for resolution.

III. For the annual accounts, the preparation and assessment of the annual
     balance sheet shall be made in accordance with generally accepted
     accounting principles and under consideration of tax law regulations.

     If and to the extent that, based on an audit by the tax authorities,
     changes must be made to the annual balance sheet, these shall be binding
     when the corresponding tax rulings become effective.

IV.  The annual balance sheet shall be affirmed by the shareholders' meeting.
     The same applies for changed or corrected annual accounts.

                                       57
<PAGE>   58

                                   SECTION 10

                                  NET PROFITS

The use of net profits shall be determined by the shareholders' meeting
according to its discretion. Profits shall only be distributed when and to the
extent that they are not needed to pay off losses carried over from prior fiscal
years.

                                   SECTION 11

                   TRANSFER AND ENCUMBRANCE OF CAPITAL SHARES

I.   The transfer and encumbrance (e.g., pledge, chattel mortgage, creation of a
     usufruct) of a capital share or part thereof, shall require the prior
     written consent of shareholders who together hold at least 75% of the
     capital shares. The same shall apply for corresponding transactions
     incurring legal obligations.

II.  No shareholder shall be entitled to grant a sub-participation, a silent
     participation or similar participation rights to third parties without
     prior written consent of the shareholders who together hold at least [75]%
     of the capital shares. Financial participations which do not carry a
     corporate or contractual influence can be agreed to -- also in the above
     mentioned forms -- without consent. However, the relevant shareholder
     shall inform the other shareholders of this in advance.

III. A shareholder can transfer its capital share to an enterprise affiliated
     with it within the meaning of the Stock Corporation Act (whereby a 50%
     participation qualifies as being majority owned) without the consent of the
     other shareholders, provided that:

     a.   The shareholder making the transfer has proven to the other
          shareholders, at least one month prior to the execution of the
          transfer and by presenting suitable documents, that the other
          enterprise is affiliated with it within the meaning of the Stock
          Corporation Act, and

     b.   at the same time, the shareholder making the transfer provides the
          other shareholders with a commitment to either reacquire or transfer
          the capital share to another affiliated enterprise within the meaning
          of the Stock Corporation Act upon relinquishment of the majority,
          dependency or dominating relationship, and

     c.   the shareholder making the transfer obligates itself vis-a-vis the
          other shareholders to timely meet all financial obligations of its
          affiliated enterprise.

IV.  For all transfers and encumbrances including the exercise of preemptive
     rights pursuant to Section 12 and the acquisition of shares pursuant to
     Section 13 para. IV, the shareholders'

                                       58
<PAGE>   59
     identity, the assumption of obligations of the departing shareholder under
     these Articles of Association and the entering into the arbitration
     agreement must be guaranteed pursuant to Section 10 para. III.

                                   SECTION 12
                               PREEMPTIVE RIGHTS

Capital shares may not be sold during the period up to the later of (i) two
years from the date of award of the UMTS/IMT 2000 3G license to the Company's
subsidiary or (ii) one year from the clearly identifiable date of commercial
launch of telecommunication services by subsidiaries of the Company (the
"Start-Up Period"), except the case of a sale to an affiliated enterprise as
more closely described in Section 11 para. 3. In all cases where a shareholder
sells shares after this point of time, except for such a sale to an affiliated
enterprise as more closely described in Section 11 para. 3, the other
shareholders shall have a preemptive right according to the following
provisions and proportionate to the interest they hold:

1.   If a shareholder wishes to sell its interest in whole or in part, it must
     first offer the shares to the other shareholders for purchase in
     proportion to their interests and at a price which is acceptable to the
     selling shareholder. If all of the shareholders do not wish to buy up the
     shares at the terms offered, the shareholder(s) prepared to purchase shall
     have the right to accept the offer as agreed upon between them within two
     months; if they do not exercise this right, the selling shareholder has
     the right to accept or reject the offers of the individual shareholders to
     purchase portions of the interest, at its discretion. If the shareholders
     do not accept the offer in the manner prescribed in this paragraph within
     two months, the selling shareholder can offer the interest to third
     parties.

2.   If the selling shareholder has found a buyer, it shall notify the other
     shareholders in writing of the intended buyer and purchase price and send
     them the entire purchase contract.

3.   The other shareholders have the right to acquire the interest up for sale
     in proportion to their interest and at the price envisaged in the
     purchase contract within a time period of two months after receiving
     notification. If they do not exercise this right (whereby they may only
     exercise this right in whole or with the approval of the selling partner
     in part), the selling partner is entitled, subject to no. 5, to sell its
     interest. Approval pursuant to Section 11 para. 1 shall be deemed as
     granted.

4.   If a shareholder does not receive the necessary cartel law permission to
     exercise its purchase right under no. 1 or its preemptive right under no.
     3, then it is obligated to transfer its purchase right or its preemptive
     right to the other shareholders proportionate

                                       59
<PAGE>   60
     to their interests and, in the event they do not accept the transfer, the
     shareholder has the right to transfer its purchase right or preemptive
     right to a third party.

5.   To the extent that shareholders do not exercise or transfer their
     preemptive rights under para. 1 nos. 3 and 4, it shall accrue to the
     remaining shareholders. They must exercise their preemptive right within a
     period of one month after expiration of the time period pursuant to para.
     1 no. 3 or after written notification of the other shareholders that they
     are waiving their preemptive right, whereby in this case it must also be
     ensured that the interest up for sale will be taken over in full, unless
     the selling shareholder agrees to a partial sale. After expiration of this
     one-month period, the selling shareholder is entitled to sell the interest
     provided that the sale is made to the buyer stipulated in the notification
     (para. 1 no. 2) and at the price stipulated therein. The approval pursuant
     to Section 11 para. 1 shall be deemed granted. Sentences 1 and 2 shall
     also apply in case of para. 1 no. 1.

6.   Should the interest be acquired by a third party, then the selling
     shareholder must ensure that the third party assumes all rights and duties
     under corporate law that arise out of these Articles of Association and
     other contracts.

                                   SECTION 13

                          REDEMPTION OF CAPITAL SHARES

I.   The shareholders can redeem the capital shares of a shareholder if the
     latter consents to this.

II.  The shareholders can pass on the redemption of a shareholder's capital
     shares without the affected shareholder being allowed to vote on this;

     1.   if official insolvency proceedings have been initiated with respect to
          his assets when the insolvency order becomes non-appealable;

     2.   if an insolvency proceeding has been petitioned for with respect to
          his assets and denied due to insufficient assets when the order of
          denial becomes non-appealable;

     3.   if a shareholder has filed an insolvency plan with the competent
          insolvency court;

     4.   if its capital shares have been attached and the attachment has not
          been lifted within a period of six weeks;

                                       60
<PAGE>   61
     5.   if the dissolution of a shareholder has been resolved;

     6.   if a shareholder has transferred shares to an affiliated enterprise
          ("transferee") pursuant to section 11 para. 3 and fails to comply with
          its obligation under section 11 para. 3 b) to either reacquire or
          transfer the capital shares to another affiliated enterprise within
          the meaning of the Stock Corporation Act upon relinquishment of the
          majority, dependency or dominating relationship within 20 business
          after receipt of a request by another shareholder to so reacquire or
          transfer the shares, in which case the capital shares hold by the
          transferee shall be redeemed;

     7    if a shareholder or an enterprise affiliated with it within the
          meaning of the Stock Corporation Act (whereby a 50% participation
          qualifies as being majority owned) is likely to cause the Company's
          subsidiary not to be admitted to the auction for the award of licenses
          for UMTS/IMT-2000 3G in Germany ("Auction") or to be disqualified from
          the Auction or to cause the German Regulatory Authority for
          Telecommunications and Posts ("RegTP") not to grant to the Company's
          subsidiary a license for UMTS/IMT-2000 3G in Germany ("license");

     8.   if RegTP informs the Company that it will withdraw the license granted
          to the Company if a shareholder does not cease to be a shareholder of
          the Company or an enterprise affiliated with a shareholder within the
          meaning of the Stock Corporation Act (whereby a 50% participation
          qualifies as being majority owned) does not cease to be an enterprise
          affiliated with such shareholder within the foregoing meaning;

          or

     9.   if there is a justifiable reason for excluding the shareholder, in
          particular if it persistently and severely violates its shareholder
          duties (e.g., the duties arising out of shareholder or advisory board
          resolutions) and fails to discontinue the violation with a period of
          six weeks after receiving written warning.

III. The shareholder resolution regarding the redemption of capital shares must
     be made with an 90% majority of the votes. The affected shareholder has no
     voting rights.

IV.  Instead of redeeming the shares, the shareholders' meeting can with an 90%
     majority vote decide that all or part of the capital shares be acquired by
     the Company under consideration of section 33 GmbHG or that they be
     transferred to the remaining shareholders proportionate to their respective
     interest or to one or several acquirers to be named by the Company. The
     affected shareholder has no voting right in this matter.

                                       61
<PAGE>   62
V.    In the case of termination, redemption shall become effective upon the
      date notification of termination was given. Otherwise it shall become
      effective upon the date to be determined in the resolution on redemption
      order.

VI.   The shareholders' meeting shall remain entitled to exercise its right of
      redemption if it has first requested an assignment of the capital shares
      and the affected shareholder refuses to do this.

VII.  The redemption order shall become effective retroactively as of the day
      the resolution was made if the affected shareholder has been notified of
      the redemption order and the grounds upon which it is based by the
      shareholders who voted for redemption, unless the affected shareholder
      timely filed a petition to establish that the redemption is not effective.
      In this case, the order shall become effective retroactively as of the
      date a court decision affirming this order becomes non-appealable.

VIII. The affected shareholder whose capital shares have been redeemed or
      pursuant to para. IV have been transferred to the Company or to the
      remaining shareholders or to a portion of the remaining shareholders shall
      receive a settlement to be calculated pursuant to Section 14.

                                   SECTION 14

                          VALUATION OF CAPITAL SHARES

I.   In all cases in which a shareholder withdraws from the Company pursuant to
     Section 13, it shall receive a settlement for the capital shares redeemed.
     The settlement shall correspond to the "Buchkapital" proportionate to its
     capital share. The Buchkapital is made up of the nominal capital plus
     surplus reserves (Rucklagen) plus net earnings (Bilanzgewinn) -- to the
     extent that profits have not yet been paid out -- minus net losses as of
     the end of the last fiscal year before the withdrawal of the shareholder.

II.  The settlement shall be due and payable within six months after the shares
     have been redeemed.

                                   SECTION 15

                                FINAL PROVISIONS

I.   Publications concerning the Company shall be made in the Federal Gazette
     (Bundesanzeiger).

                                       62
<PAGE>   63
II.  All agreements among the shareholders and with the shareholders that
     affect the Company relationship must be made in writing, to the extent the
     law does not require notarization.

III. Should the individual provision of these Articles of Association be invalid
     or become invalid, the Articles of Association shall otherwise remain
     valid. In this case, the invalid provision shall be construed or
     supplemented such that the economic purpose intended by the provision is
     achieved.

IV.  Disputes concerning the validity of this contract and its interpretation,
     as well as concerning the arbitration agreement itself, shall be decided
     by a court of arbitration and precluding general jurisdiction of the
     courts on the basis of a separate arbitration agreement pursuant to German
     law.

V.   All costs associated with these Articles of Association and their
     execution shall be borne by the Company.

                                       63<PAGE>   1
                                                                    EXHIBIT 4.2

                                             VOICESTREAM STOCKHOLDERS AGREEMENT

                             STOCKHOLDERS AGREEMENT

     This Stockholders Agreement (this "Agreement") dated as of July 23, 2000
among each of the stockholders listed on the signature page hereto (each, a
"Stockholder") and Deutsche Telekom, an Aktiengesellschaft organized and
existing under the laws of the Federal Republic of Germany ("DT").

                                       1
<PAGE>   2
     WHEREAS, simultaneously with the execution of this Agreement, VoiceStream
Wireless Corporation, a Delaware corporation ("VoiceStream"), and DT are
entering into an Agreement and Plan of Merger (the "Merger Agreement"), dated as
of the date hereof, providing, among other things, for the merger of a
subsidiary of DT with and into VoiceStream.

     WHEREAS, DT has agreed to enter into the Merger Agreement only if all the
Stockholders who are parties hereto enter into this Agreement;

     WHEREAS, in the Merger Agreement DT has agreed, subject to the conditions
set forth therein, to acquire all of the shares of VoiceStream Common Stock (as
defined below);

     NOW THEREFORE, in consideration of the foregoing and the mutual premises,
representations, warranties, covenants and agreements contained herein and in
the Merger Agreement, the parties hereto, intending to be legally bound hereby
agree as follows:

     1.    Certain Definitions.

     (a)   For the purposes of this Agreement, all capitalized terms used but
           not otherwise defined herein shall have the respective meanings given
           to such terms in the Merger Agreement.

     (b)   For purposes of this Agreement, the words "beneficially owned" or
           "beneficial ownership" shall include, with respect to any securities,
           the beneficial ownership by a Stockholder and by any direct or
           indirect Subsidiary of a Stockholder.

     (c)   For purposes of this Agreement, the following terms shall have
           the following meanings:

     "DT Derivative Securities" means any security convertible into or
     exchangeable for DT Securities of the value of which is derived from the
     value of DT Securities.

     "DT Securities" means DT Ordinary Shares and DT American Depositary Shares,
     each representing the right to receive one DT Ordinary Share.

     "Transfer" means, with respect to any security, the sale, transfer, pledge,
     hypothecation, encumbrance, assignment or constructive sale or other
     disposition of such security or the record or beneficial ownership thereof,
     the offer to make such a sale, transfer, constructive sale or other
     disposition, and each agreement, arrangement or understanding, whether or
     not in writing, to effect any of the foregoing. The term "constructive
     sale" means a short sale with respect to such security, entering into or
     acquiring an offsetting derivative contract with respect to such security,
     entering into or acquiring a futures or forward contract to deliver such
     security or entering into any transaction that has substantially the same
     effect as any of the foregoing; provided, however, that the term
     "constructive sale" shall not include transactions involving the purchase
     and sale of securities tracking a broad-based stock index excluding the DAX
     Index.

     2.    Representations; Warranties and Covenants of Each Stockholder. Each
           Stockholder hereby represents and warrants, severally and not
           jointly, to DT, solely with respect to itself, as follows:

     (a)   Title. As of the date hereof, such Stockholder is the sole record or
           beneficial owner of the number of shares of VoiceStream Common Stock
           or VoiceStream Preferred Stock, as the case may be, set forth
           opposite such Stockholder's name on Exhibit A attached hereto (with
           respect to each

                                       2
<PAGE>   3
Stockholder, such Stockholder's "Existing Shares" and, together with record or
beneficial ownership of any shares of VoiceStream Common Stock or other voting
capital stock of VoiceStream acquired after the date hereof, whether upon the
exercise of warrants or options, conversion of VoiceStream Preferred Stock or
any convertible securities or otherwise, such Stockholder's "Shares"), and/or
the number of warrants, options or other rights to acquire or receive such
VoiceStream Common Stock or VoiceStream Preferred Stock, as the case may be,
set forth opposite such Stockholder's name on Exhibit A attached hereto (with
respect to each Stockholder, such Stockholder's "Existing Rights" and, together
with record or beneficial ownership of any warrants, options or other rights to
acquire or receive such shares of VoiceStream Common Stock or other voting
capital stock of VoiceStream acquired after the date hereof, such Stockholder's
"Rights"). Such Stockholder is the lawful owner of the Existing Shares and
Existing Rights, free and clear of all liens, claims, charges, security
interests or other encumbrances, except as disclosed on Exhibit A. As of the
date hereof, the Existing Shares constitute all of the capital stock of
VoiceStream owned of record or beneficially by such Stockholder (excluding the
Existing Rights) and such Stockholder does not own of record or beneficially,
or have the right to acquire (whether currently, upon lapse of time, following
the satisfaction of any conditions, upon the occurrence of any event or any
combination of the foregoing) any shares of VoiceStream Common Stock or
VoiceStream Preferred Stock or any other securities convertible into or
exchangeable or exercisable for shares of VoiceStream Common Stock, except
pursuant to the Existing Rights.

     (b)  Right to Vote. Such Stockholder has, with respect to all of such
Stockholder's Existing Shares, and will have at the VoiceStream Stockholders'
Meeting, with respect to all of such Stockholder's Shares acquired prior to the
record date for the VoiceStream Shareholders' Meeting, sole voting power, sole
power of disposition or sole power to issue instructions with respect to the
matters set forth in Section 4 hereof and to fulfill its obligations under such
Section and shall not take any action or grant any person any proxy (revocable
or irrevocable) or power-of-attorney with respect to any Shares or Rights
inconsistent with his or its obligations as provided by Section 4 hereof.
Each Stockholder hereby revokes any and all proxies with respect to such
Stockholder's Existing Shares to the extent they are inconsistent with the
Stockholders' obligations under this Agreement.

     (c)  Authority. Such Stockholder has full legal power, authority, legal
capacity and right to execute and deliver, and to perform its or his
obligations under, this Agreement. No other proceedings or actions on the part
of such Stockholder are necessary to authorize the execution, delivery or
performance of this Agreement or the consummation of the transactions
contemplated hereby. This Agreement has been duly and validly executed and
delivered by such Stockholder and constitutes a valid and binding agreement of
such Stockholder enforceable against such Stockholder in accordance with its
terms, subject to (i) bankruptcy, insolvency, moratorium and other similar laws
now or hereafter in effect relating to or affecting creditors rights
generally and (ii) general principles of equity (regardless of whether
considered in a proceeding at law or in equity).

     (d)  Conflicting Instruments. Neither the execution and delivery of this
Agreement nor the performance by such Stockholder of its agreements and
obligations hereunder will result in any breach or violation of, or be in
conflict with or constitute a default under, any term of any agreement,
judgment, injunction, order, decree, federal law or regulation to which such
Stockholder is a party or by which such Stockholder (or any of its assets) is
bound.

     (e)  DT's Reliance. Such Stockholder understands and acknowledges

                                       3
<PAGE>   4
that DT is entering into the Merger Agreement in reliance upon such
Stockholder's execution, delivery and performance of this Agreement.

     3.   Restriction on Transfer; Other Restrictions.

     (a)   Each Stockholder agrees not to Transfer or agree to Transfer any
Shares or Rights owned of record or beneficially by such Stockholder, except as
otherwise permitted by this Section 3 or pursuant to the Merger Agreement,
Transfers to any Affiliate of the Stockholder who agrees in writing to be bound
by the terms of this Agreement or Transfers which occur by operation of law if
the transferee remains, or agrees in writing to remain, bound by the terms of
this Agreement, other than, in each case, with DT's prior written consent.

     (b)   From the date hereof until the later of January 1, 2001 and the date
of the VoiceStream Stockholders' Meeting, each Stockholder agrees not to
Transfer any Shares or Rights owned of record or beneficially by such
Stockholder, provided, however, that this Section 3(b) shall cease to be of any
force or effect immediately upon termination of the Merger Agreement.

     (c)   From the later of January 1, 2001 and the date of the VoiceStream
Stockholders' Meeting, until the earlier of the Effective Time or the
termination of the Merger Agreement, each Stockholder may Transfer only up to
17.5% of such Stockholder's Total Number of Shares; provided, however, that if
the Effective Time shall not have occurred by July 31, 2001, the percentage
specified in this Section 3(c) shall on August 1, 2001 be increased by 3.75%
and, if the Effective Time shall not have occurred by August 31, 2001, the
percentage specified in this Section 3(c) shall on September 1, 2001 be
increased by an additional 3.75%, for an aggregate amount from and after
September 1, 2001 of 25%.

     (d)   From the Effective Time through and including the three month
anniversary of the Effective Time, each Stockholder agrees not to Transfer any
DT Securities or DT Derivative Securities.

     (e)   From the day following the three month anniversary of the Effective
Time, through and including the six month anniversary of the Effective Time,
each Stockholder may Transfer only up to 40% of such Stockholder's Total Number
of Shares, inclusive of any Transfer of any DT Derivative Securities.

     (f)   For the avoidance of doubt, the portions of a Stockholder's Total
Number of Shares permitted to be Transferred pursuant to Section 3(c) and
Section 3(e) are (i) separate and not cumulative such that if a Stockholder does
not fully utilize the permission to Transfer up to 17.5% of such Stockholder's
Total Number of Shares pursuant to Section 3(c), such Stockholder shall not be
permitted to Transfer more than 40% of such Stockholder's Total Number of Shares
pursuant to Section 3(e) and (ii) exclusive of any Transfers permitted by this
Agreement which occur at any time after the date hereof and prior to the end of
the periods specified in such Sections.

     (g)   For purposes of Section 3(c), a Stockholder's "Total Number of
Shares" is equal to the sum (such sum, the "Initial Number of Shares") of (i)
the number of shares of Voicestream Common Stock owned of record or beneficially
by the Stockholder as of the later of January 1, 2001 and the date of the
Voicestream Stockholders' Meeting, including any shares of Voicestream Common
Stock obtainable by the Stockholder upon conversion of any shares of Voicestream
Preferred Stock owned by the Stockholder and (ii) the number of shares of
Voicestream Common Stock owned of record or beneficially by the Stockholder as a
result of the exercise or conversion, as applicable, of any

                                       4
<PAGE>   5
options, warrants or convertible securities (other than Voicestream Preferred
Stock) to acquire shares of Voicestream Common Stock, during the period from the
later of January 1, 2001 and the date of the Voicestream Stockholders' Meeting,
until the earlier of the Effective Time and the termination of the Merger
Agreement. For purposes of Section 3(e), Stockholder's Total Number of Shares is
equal to the sum of (i) the number of DT Securities which the Stockholder would
have been entitled to receive as Merger Consideration in the Merger in respect
of the Initial Number of Shares (determined as if all of the Stockholders who
have entered into Stockholder Agreements with DT in connection with the Merger
had made a Mixed Election) and  (ii) the number of DT Securities owned of record
or beneficially by the Stockholder as a result of the exercise or conversion, as
applicable, of any options, warrants or convertible securities to acquire DT
Securities (other than any such options, warrants or convertible securities
included in the calculation of the Initial Number of Shares), during the
relevant periods specified in such subsection (e).

     (h)  The foregoing limitations set forth in Sections 3(c) and (e) shall not
apply to any Transfers pursuant to a tender offer, self tender offer, exchange
offer or other transaction offered generally to holders of DT Securities and
approved or not opposed by DT's Supervisory Board, and securities subject to a
Transfer made pursuant to this Section 3(h) and Section 3(l) shall be deemed
continued to be owned by the Stockholder for purposes of the calculations made
under Sections 3(c) and (e).

     (i)  (Reserved)

     (j)  Each Stockholder agrees, prior to the Effective Time, not to effect,
directly or indirectly, or through any arrangement with a third party pursuant
to which such third party may effect, directly or indirectly, any short sales of
any VoiceStream Common Stock, DT Securities or DT Derivative Securities except
in accordance with the limitations of Section 3(c).

     (k)  Each Stockholder hereby irrevocably waives any rights of appraisal or
rights to dissent from the Merger that such Stockholder may have.

     (l)  If DT's existing majority shareholders elect to effect a secondary
offering of their DT Securities during the period from the Effective Time
through the first anniversary of the Effective Time pursuant to a registration
statement filed pursuant to the Securities Act, DT shall use its reasonable best
efforts to obtain the agreement of such existing majority shareholders to
include in such offering the maximum amount of DT Securities acquired pursuant
to the Merger by the Stockholder and all other stockholders who have entered
into Stockholder Agreements with DT in connection with the Merger (the
Stockholder and such other stockholders, collectively, the "Stockholders") which
such existing shareholders determine may be included in such secondary offering
without adversely affecting such secondary offering of the securities being sold
by such existing majority shareholders, on such terms and conditions as such
existing majority shareholders deem appropriate.

     (m)  DT has not entered into and from and after the date hereof will not
enter into, an agreement of the kind described in Section 3(l) above pursuant to
which DT or its current majority shareholders would be requested to grant
registration rights to any third parties in connection with a secondary offering
of DT Securities by such existing majority shareholders, unless such third
parties will not have the right to have any shares included in such registered
offering unless all of the shares requested to be included in such registered
offering by any Stockholders are so included.

     (n)  If DT acquires any company after the date hereof for consideration
valued at more than $15 billion and, at the time the agreement in

                                       5
<PAGE>   6
respect of such acquisition by DT is entered into, (i) such company has a
single stockholder who owns 10% or more or a group of stockholders owning in
the aggregate 20% or more of the outstanding voting securities of such company
and (ii) in each case such stockholders are (or at any time within the prior
two years were) directors of or have the right to designate one or more
directors to the Board of Directors of such company or are officers of such
company or such company has any 5% or greater stockholders (other than
institutional investors) as to whom DT could reasonably enter into an agreement
in support of such acquisition and DT obtains or could reasonably be expected
to obtain the agreement of any such stockholder or group of stockholders of
such company, as the case may be, to vote for and support the acquisition or to
limit its powers of disposition in connection with the acquisition, the
transfer restrictions specified in Sections 3(a) through (e) shall be revised
to reflect the more favorable treatment of the stockholders of such company or
the absence of restrictions, as the case may be, including the grant or
sufferance to exist of registration rights.

     4.   Agreement to Vote. Each Stockholder hereby irrevocably and
unconditionally agrees to vote or to cause to be voted or provide a consent with
respect to, all Shares that he or it owns of record or beneficially as of the
record date for the VoiceStream Stockholders' Meeting at the VoiceStream
Stockholders' Meeting and at any other annual or special meeting of stockholders
of VoiceStream or action by written consent where such matters arise (a) in
favor of the Merger and the Merger Agreement and approval of the terms thereof
and (b) against, and such Stockholder will not consent to, approval of any
Alternative Transaction or the liquidation or winding up of VoiceStream. The
obligations of each such Stockholder specified in this Section 4 shall apply
whether or not the Board of Directors of VoiceStream makes a Subsequent
Determination.

     5.   Delivery of Proxy. In furtherance of the agreements contained in
Section 4 hereof, each Stockholder hereby agrees (a) to complete and send the
proxy card received by such Stockholder with the VoiceStream Proxy Statement, so
that such proxy card is received by VoiceStream, as prescribed by the
VoiceStream Proxy Statement, not later than the fifth Business Day preceding the
day of the VoiceStream Stockholders' Meeting, (b) to vote, by completing such
proxy card but not otherwise, all the Shares he or it owns of record or
beneficially as of the record date for the VoiceStream Stockholders' Meeting (i)
in favor of the Merger and the Merger Agreement and (ii) if the opportunity to
do so is presented to such Stockholder on the proxy card, against any
Alternative Transaction and (c) not to revoke any such proxy.

     6.   No Solicitation. From and after the date hereof, the Stockholders
shall not, nor shall they permit any of their respective Subsidiaries to, nor
shall they authorize or instruct any of their respective officers, directors,
members or employees to, and shall use their reasonable best efforts to cause
any investment banker, financial advisor, attorney, accountants or other
representatives retained by them or any of their respective Subsidiaries not to,
directly or indirectly through another person, on their behalf, (i) solicit,
initiate or knowingly encourage (including by way of furnishing information), or
knowingly take any other action designed to facilitate, any Alternative
Transaction, or (ii) participate in any substantive discussions or negotiations
regarding any Alternative Transaction, provided that nothing herein shall affect
the ability of any Stockholder in its capacity as an officer, director, employee
of, or adviser or investment banker to, VoiceStream to take any action which is
permissible under the Merger Agreement.

     7.   Termination of VoiceStream Voting Agreement and other Agreements with
Stockholders. The VoiceStream Voting Agreement, the Investor

                                       6
<PAGE>   7
Agreement by and among Sonera Ltd. and VoiceStream dated as of September 17,
1999 and the Registration Rights Agreement between VoiceStream and Sonera Ltd.
dated as of September 17, 1999 shall, in consideration of the undertakings by
DT under this Agreement and the Merger Agreement, be terminated and be of no
further force or effect effective at the Effective Time. Each of the
Stockholders agrees that (a) until the earlier of (x) the later of January 1,
2001 and the date of the VoiceStream Stockholders' Meeting, and (y) the
termination of the Merger Agreement, such Stockholder shall not exercise any
registration rights and (b) from the date hereof until the earlier of the
termination of the Merger Agreement or the Effective Time, such Stockholder
shall not be entitled to the benefit of any preemption rights that such
Stockholder may have under the agreements listed in the immediately preceding
sentence as a result of the investment contemplated by the DT Financing
Agreements. None of the agreements so listed shall be amended or modified in a
manner inconsistent with the terms of this Agreement without DT's prior written
approval.

     8.   [Reserved]

     9.   Additional Shares and Additional Rights. If, after the date hereof, a
Stockholder acquires record or beneficial ownership of any additional shares of
capital stock of VoiceStream (any such shares, "Additional Shares"), including,
without limitation, upon exercise of any option, warrant or right to acquire
shares of capital stock of VoiceStream, through the conversion of the
VoiceStream Preferred Stock or through any stock dividend or stock split, or
record or beneficial ownership of any additional options, warrants or rights to
acquire shares of capital stock of VoiceStream (any such options, warrants, or
rights, "Additional Rights"), the provisions of this Agreement applicable to the
Shares and the Rights shall be applicable to such Additional Shares and
Additional Rights from and after the date of acquisition thereof. The provisions
of the immediately preceding sentence shall be effective with respect to
Additional Shares and Additional Rights without action by any Person immediately
upon the acquisition by any Stockholder of record or beneficial ownership of
such Additional Shares or Additional Rights.

     10.  Miscellaneous.

     (a)  Entire Agreement. This Agreement constitutes the entire agreement
among the parties with respect to the subject matter hereof.

     (b)  Costs and Expenses. All costs and expenses incurred in connection
with this Agreement and the transactions contemplated hereby shall be paid by
the party incurring such expenses.

     (c)  Invalid Provisions. If any provision of this Agreement shall be
invalid or unenforceable under applicable law, such provision shall be
ineffective to the extent of such invalidity or unenforceability only, without
it affecting the remaining provisions of this Agreement.

     (d)  Execution in Counterparts. This Agreement may be executed in
counterparts transmitted and delivered by facsimile each of which shall be an
original with the same effect as if the signatures hereto and thereto were upon
the same instrument.

     (e)  Specific Performance. Each Stockholder agrees with DT as to himself
or itself that if for any reason such Stockholder fails to perform any of his
or its agreements or obligations under this Agreement, irreparable harm or
injury to DT would be caused as to which money damages would not be an adequate
remedy. Accordingly, each Stockholder agrees that, in seeking to enforce this
Agreement against such Stockholder, DT shall be entitled, in

                                       7
<PAGE>   8
addition to any other remedy available at law, equity or otherwise, to
specific performance and injunctive and other equitable relief. The provisions
of this Section 10(e) are without prejudice to any other rights or remedies,
whether at law or in equity, that DT may have against such Stockholder for any
failure to perform any of its agreements or obligations under this Agreement.

     (f)  Amendments; Termination.

          (i)  This Agreement, including this Section 10(f), may not be
     modified, amended, altered or supplemented, except upon the execution and
     delivery of a written agreement executed by the parties hereto.

          (ii) The provisions of this Agreement (other than Sections 3, 4 and
     5) shall terminate upon the earliest to occur of (A) the consummation of
     the Merger, (B) the date that is two (2) years after the date hereof, and
     (C) the termination of the Merger Agreement. The provisions of Section 3
     of this Agreement shall terminate when the applicable time period set
     forth therein lapses. The provisions of Sections 4 and 5 of this Agreement
     shall terminate upon the earlier of the consummation of the Merger and
     termination of the Merger Agreement.

     (g)  Governing Law; Submission and Jurisdiction.

          (i)  This Agreement shall be governed by and construed in accordance
     with the laws of the State of Delaware without giving effect to the
     principles of conflicts of laws thereof.

          (ii) Each of the parties 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 brought by the other party
     hereto or its successors or assigns shall be brought and determined only
     in the United States District Court for the State of Delaware or, in the
     event (but only in the event) that such court does not have subject matter
     jurisdiction over such action or proceeding, in the courts of the State of
     Delaware. Each of the parties hereto hereby irrevocably submits with
     regard to any such action or proceeding for itself and in respect to 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, (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 this Section 10(g)(ii) or 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 (B) to the fullest
     extent permitted by the applicable law, that (x) the suit, action or
     proceeding in such court is brought in an inconvenient forum, (y) the
     venue of such suit, action or proceeding is improper and (z) this
     Agreement, or the subject matter hereof, may not be enforced in or by
     such courts. Without limiting the foregoing, each party agrees that
     service of process on such party as provided in Section 10(i) shall be
     deemed effective service of process on such party.

     (h)  Successors and Assigns. The provisions of this Agreement shall be
binding upon and inure to the benefit of the parties hereto and their
respective legal successors (including, in the case of such Stockholder or any
other individual, any executors, administrators, estates, legal representatives
and heirs of such Stockholder or such individual) and permitted

                                       8
<PAGE>   9
assigns; provided that, except as otherwise provided in this Agreement, no party
may assign, delegate or otherwise transfer any of its rights or obligations
under this Agreement.

     (i)  Notices. All notices and other communications given or made pursuant
hereto shall be in writing and shall be deemed to have been duly given or made
as of the date of receipt and shall be delivered personally or sent by overnight
courier or sent by telecopy, to the Parties at the following addresses or
telecopy numbers (or at such other address or telecopy number for a party as
shall be specified by like notice):

          (i)  if to a Stockholder, at such Stockholder's address appearing on
     Annex A hereto or at any other address that such Stockholder may have
     provided in writing to DT and the other Stockholders,

               with a copy to:

                    Wachtell, Lipton, Rosen & Katz
                    51 West 52nd Street
                    New York, New York 10019

                    Attention: Daniel A. Neff
                    Facsimile: 212-403-2000

               And a copy to:

                    Friedman, Kaplan & Seiler LLP
                    875 Third Avenue
                    New York, New York 10022

                    Attention: Barry A. Adelman
                    Facsimile: 212-355-6401

          (ii) if to DT:

                    Deutsche Telekom AG
                    140 Friedrich-Ebert-Allee
                    53113 Bonn
                    Germany

                    Attention: Kevin Copp
                    Facsimile: +49-228-181-44177

               with a copy to:

                    Cleary, Gottlieb, Steen & Hamilton
                    One Liberty Plaza
                    New York, New York 10006

                    Attention: Robert P. Davis
                    Facsimile: (212) 225-3999

     (j)  Waiver of Immunity. Each of DT and Stockholder agrees that, to the
extent that it or any of its property is or becomes entitled at any time to any
immunity on the grounds of sovereignty or otherwise based upon its status as an
agency or instrumentality of government from any legal action,

                                       9
<PAGE>   10
suit or proceeding or from setoff or counterclaim relating to this Agreement
from the jurisdiction of any competent court, from service of process, from
attachment prior to judgment, from attachment in aid of execution of a
judgment, from execution pursuant to a judgment or arbitral award, or from any
other legal process in any jurisdiction, it, for itself and its property
expressly, irrevocably and unconditionally waives, and agrees not to plead or
claim, any such immunity with respect to such matters arising with respect to
this Agreement or the subject matter hereof (including any obligation for the
payment of money). DT agrees that the waiver in this provision 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. Section 1602 et seq.
The foregoing waiver shall constitute a present waiver of immunity at any time
any action is initiated against DT or Stockholder with respect to this
Agreement.

     IN WITNESS WHEREOF, the parties hereto have executed this Stockholders
Agreement as of this 23rd day of July, 2000.

                                   DEUTSCHE TELEKOM AG

                                   By:             /s/ Kevin Copp
                                       --------------------------------------
                                   Name:  Kevin Copp
                                   Title: Head of International Legal Affairs

                                   SONERA CORPORATION

                                   By:         /s/ Kaj-Erik Relander
                                       --------------------------------------
                                   Name:  Kaj-Erik Relander
                                   Title: Deputy CEO

                                   SONERA HOLDING B.V.

                                   By:         /s/ Kaj-Erik Relander
                                       --------------------------------------
                                   Name:  Kaj-Erik Relander
                                   Title: Deputy CEO

                                       10
<PAGE>   11
                                                                       EXHIBIT A

<TABLE>
<CAPTION>

Stockholder Name and Address             Number of Existing Shares          Number and Description of Existing Rights
----------------------------             -------------------------          -----------------------------------------
<S>                                      <C>
Sonera Corporation                       10,203,843
P.O. Box 106
FIN-00051-TELE
Teollisuuskatu 15, Helsinki
Attn: Kaj-Erik Relander,
Executive Vice President
Facsimile: 011 358 2040 3770

Sonera Holding, B.V.                      8,771,930
c/o Sonera Corporation
P.O. Box 106
FIN-00051-TELE
Teollisuuskatu 15, Helsinki
Attn: Kaj-Erik Relander,
Executive Vice President
Facsimile: 011 358 2040 3770
                                         18,975,773
                                         ----------
</TABLE>

                                       11

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