Document:

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                                                                     Exhibit 4.1

                 FORM OF AMENDED AND RESTATED DEPOSIT AGREEMENT

                          GRUPO IUSACELL, S.A. de C.V.

                                       AND

                              THE BANK OF NEW YORK

                                  As Depositary

                                       AND

           OWNERS AND HOLDERS OF SERIES L AMERICAN DEPOSITARY RECEIPTS

                                Deposit Agreement

                            Dated as of June 14, 1994

                 As Amended and Restated as of __________, 2000
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<S>                                                                                                     <C>
ARTICLE 1.        DEFINITIONS...........................................................................   1

   SECTION 1.01.        AMERICAN DEPOSITARY SHARES......................................................   1
   SECTION 1.02.        COMMISSION......................................................................   2
   SECTION 1.03.        COMPANY.........................................................................   2
   SECTION 1.04.        CUSTODIAN.......................................................................   2
   SECTION 1.05.        DEPOSIT AGREEMENT...............................................................   2
   SECTION 1.06.        DEPOSITARY; CORPORATE TRUST OFFICE..............................................   2
   SECTION 1.07.        DEPOSITED SECURITIES............................................................   2
   SECTION 1.08.        DOLLARS; PESOS..................................................................   2
   SECTION 1.09.        FOREIGN REGISTRAR...............................................................   3
   SECTION 1.10.        INDEVAL.........................................................................   3
   SECTION 1.11.        OWNER...........................................................................   3
   SECTION 1.12.        RECEIPTS........................................................................   3
   SECTION 1.13.        REGISTRAR.......................................................................   3
   SECTION 1.14.        RESTRICTED SECURITIES...........................................................   3
   SECTION 1.15.        SECURITIES ACT OF 1933..........................................................   3
   SECTION 1.16.        SHARES..........................................................................   3

ARTICLE 2.        FORM OF RECEIPTS, DEPOSIT OF SHARES, EXECUTION AND DELIVERY,
TRANSFER AND SURRENDER OF RECEIPTS. ....................................................................   4

   SECTION 2.01.        FORM AND TRANSFERABILITY OF RECEIPTS............................................   4
   SECTION 2.02.        DEPOSIT OF SHARES...............................................................   4
   SECTION 2.03.        EXECUTION AND DELIVERY OF RECEIPTS..............................................   5
   SECTION 2.04.        TRANSFER OF RECEIPTS; COMBINATION AND SPLIT-UP OF RECEIPTS......................   6
   SECTION 2.05.        SURRENDER OF RECEIPTS AND WITHDRAWAL OF SHARES..................................   6
   SECTION 2.06.        LIMITATIONS ON EXECUTION AND DELIVERY, TRANSFER AND SURRENDER OF RECEIPTS.......   7
   SECTION 2.07.        LOST RECEIPTS, ETC..............................................................   8
   SECTION 2.08.        CANCELLATION AND DESTRUCTION OF SURRENDERED RECEIPTS............................   8
   SECTION 2.09.        PRE-RELEASE OF RECEIPTS.........................................................   8

ARTICLE 3.        CERTAIN OBLIGATIONS OF OWNERS OF RECEIPTS.............................................   9

   SECTION 3.01.        FILING PROOFS, CERTIFICATES AND OTHER INFORMATION...............................   9
   SECTION 3.02.        LIABILITY OF OWNER FOR TAXES....................................................   9
   SECTION 3.03.        WARRANTIES ON DEPOSIT OF SHARES.................................................  10

ARTICLE 4.        THE DEPOSITED SECURITIES..............................................................  10

   SECTION 4.01.        CASH DISTRIBUTIONS..............................................................  10
   SECTION 4.02.        DISTRIBUTIONS OTHER THAN CASH, SHARES OR RIGHTS.................................  10
   SECTION 4.03.        DISTRIBUTIONS IN SHARES.........................................................  11
   SECTION 4.04.        RIGHTS..........................................................................  11
   SECTION 4.05.        CONVERSION OF FOREIGN CURRENCY..................................................  13
   SECTION 4.06.        FIXING OF RECORD DATE...........................................................  14
   SECTION 4.07.        VOTING OF DEPOSITED SECURITIES..................................................  14
   SECTION 4.08.        CHANGES AFFECTING DEPOSITED SECURITIES..........................................  15
   SECTION 4.09.        REPORTS.........................................................................  15
   SECTION 4.10.        LISTS OF OWNERS.................................................................  16
   SECTION 4.11.        WITHHOLDING.....................................................................  16
   SECTION 4.12.        EXCHANGE OFFER..................................................................  16

ARTICLE 5.        THE DEPOSITARY, THE CUSTODIANS AND THE COMPANY........................................  17

   SECTION 5.01.        MAINTENANCE OF OFFICE AND TRANSFER BOOKS BY THE DEPOSITARY......................  17
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<S>                                                                                                      <C>
   SECTION 5.02.        PREVENTION OR DELAY IN PERFORMANCE BY THE DEPOSITARY OR THE COMPANY.............  18
   SECTION 5.03.        OBLIGATIONS OF THE DEPOSITARY, THE CUSTODIAN AND THE COMPANY....................  18
   SECTION 5.04.        RESIGNATION AND REMOVAL OF THE DEPOSITARY.......................................  19
   SECTION 5.05.        THE CUSTODIANS..................................................................  20
   SECTION 5.06.        NOTICES AND REPORTS.............................................................  20
   SECTION 5.07.        DISTRIBUTION OF ADDITIONAL SHARES, RIGHTS, ETC..................................  21
   SECTION 5.08.        INDEMNIFICATION.................................................................  21
   SECTION 5.09.        CHARGES OF DEPOSITARY...........................................................  22
   SECTION 5.10.        RETENTION OF DEPOSITARY DOCUMENTS...............................................  22
   SECTION 5.11.        EXCLUSIVITY.....................................................................  22
   SECTION 5.12.        LIST OF RESTRICTED SECURITIES OWNERS............................................  23

ARTICLE 6.        AMENDMENT AND TERMINATION.............................................................  23

   SECTION 6.01.        AMENDMENT.......................................................................  23
   SECTION 6.02.        TERMINATION.....................................................................  23

ARTICLE 7.        MISCELLANEOUS.........................................................................  24

   SECTION 7.01.        COUNTERPARTS....................................................................  24
   SECTION 7.02.        NO THIRD PARTY BENEFICIARIES....................................................  24
   SECTION 7.03.        SEVERABILITY....................................................................  25
   SECTION 7.04.        HOLDERS AND OWNERS AS PARTIES; BINDING EFFECT...................................  25
   SECTION 7.05.        NOTICES.........................................................................  25
   SECTION 7.06.        GOVERNING LAW...................................................................  26
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                                DEPOSIT AGREEMENT

         DEPOSIT AGREEMENT dated as of June 14, 1994, as amended and restated as
of _________, 2000, among Grupo Iusacell, S.A. de C.V., incorporated under the
laws of the United Mexican States (herein called the Company), THE BANK OF NEW
YORK, a New York banking corporation (herein called the Depositary), and all
Owners and holders from time to time of American Depositary Receipts issued
hereunder.

                              W I T N E S S E T H :

         WHEREAS, the Company desires to provide, as hereinafter set forth in
this Deposit Agreement, for the deposit of Shares (as hereinafter defined) of
the Company from time to time with the Depositary or with the Custodian (as
hereinafter defined) as agent of the Depositary for the purposes set forth in
this Deposit Agreement, for the creation of American Depositary Shares
representing the Shares so deposited and for the execution and delivery of
American Depositary Receipts evidencing the American Depositary Shares; and

         WHEREAS, the American Depositary Receipts are to be substantially in
the form of Exhibit A annexed hereto, with appropriate insertions, modifications
and omissions, as hereinafter provided in this Deposit Agreement;

         NOW, THEREFORE, in consideration of the premises, it is agreed by and
among the parties hereto as follows:

ARTICLE 1. DEFINITIONS.

         The following definitions shall for all purposes, unless otherwise
clearly indicated, apply to the respective terms used in this Deposit Agreement:

         SECTION 1.01. American Depositary Shares.

                  The term "American Depositary Shares" shall mean the
securities representing the interests in the Deposited Securities and evidenced
by the Receipts issued hereunder. Each American Depositary Share shall represent
ten Shares, until there shall occur a distribution upon Deposited Securities
covered by Section 4.03 or a change in Deposited Securities covered by Section
4.08 with respect to which additional Receipts are not executed and delivered,
and thereafter American Depositary Shares shall evidence the amount of Shares or
Deposited Securities specified in such Sections.
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         SECTION 1.02. Commission.

                  The term "Commission" shall mean the Securities and Exchange
Commission of the United States or any successor governmental agency in the
United States.

         SECTION 1.03. Company.

                  The term "Company" shall mean Grupo Iusacell, S.A. de C.V.,
incorporated under the laws of the United Mexican States, and its successors.

         SECTION 1.04. Custodian.

                  The term "Custodian" shall mean the Mexico City, Mexico,
office of Nacional Financiera, S.N.C., as agent of the Depositary for the
purposes of this Deposit Agreement, and any other firm or corporation which may
hereafter be appointed by the Depositary pursuant to the terms of Section 5.05,
as substitute or additional custodian or custodians hereunder, as the context
shall require and shall also mean all of them collectively.

         SECTION 1.05. Deposit Agreement.

                  The term "Deposit Agreement" shall mean this Agreement, as the
same may be amended from time to time in accordance with the provisions hereof.

         SECTION 1.06. Depositary; Corporate Trust Office.

                  The term "Depositary" shall mean The Bank of New York, a New
York banking corporation, and any successor as depositary hereunder. The term
"Corporate Trust Office", when used with respect to the Depositary, shall mean
the office of the Depositary which at the date of this Agreement is 101 Barclay
Street, New York, New York, 10286.

         SECTION 1.07. Deposited Securities.

                  The term "Deposited Securities" as of any time shall mean
Shares at such time deposited or deemed to be deposited under this Deposit
Agreement and any and all other securities, property and cash received by the
Depositary or the Custodian in respect thereof and at such time held hereunder,
subject as to cash to the provisions of Section 4.05.

         SECTION 1.08. Dollars; Pesos.

                  The term "Dollars" shall mean United States dollars. The term
"Pesos" shall mean Mexican New Pesos.

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         SECTION 1.09. Foreign Registrar.

                  The term "Foreign Registrar" shall mean the entity that
presently carries out the duties of registrar for the Shares or any successor as
registrar for the Shares and any other appointed agent of the Company for the
transfer and registration of Shares.

         SECTION 1.10. Indeval.

                  The term "Indeval" shall mean Indeval, S.A. de C.V., the
Mexican securities depositary institution, and any successor which performs
substantially similar functions in Mexico.

         SECTION 1.11. Owner.

                  The term "Owner" shall mean the person in whose name a Receipt
is registered on the books of the Depositary maintained for such purpose.

         SECTION 1.12. Receipts.

                  The term "Receipts" shall mean the American Depositary
Receipts issued hereunder evidencing American Depositary Shares.

         SECTION 1.13. Registrar.

                  The term "Registrar" shall mean any bank or trust company
having an office in the Borough of Manhattan, The City of New York, which shall
be appointed to register Receipts and transfers of Receipts as herein provided.

         SECTION 1.14. Restricted Securities.

                  The term "Restricted Securities" shall mean securities that
are "restricted" as defined in Rule 144(a)(3) under the Securities Act of 1933
or which are subject to other restrictions on sale or deposit under the laws of
the United States or the United Mexican States or the Estatutos Sociales of the
Company.

         SECTION 1.15. Securities Act of 1933.

                  The term "Securities Act of 1933" shall mean the United States
Securities Act of 1933, as from time to time amended.

         SECTION 1.16. Shares.

                  The term "Shares" shall mean Series L shares of capital stock,
with limited voting rights, without expression of par value, in registered form
of the Company, heretofore validly issued and outstanding and fully paid,
nonassessable and free of any pre-emptive rights of the holders of outstanding
Shares or hereafter validly issued and

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outstanding and fully paid, nonassessable and free of any pre-emptive rights of
the holders of outstanding Shares or interim certificates representing such
Shares.

ARTICLE  2. FORM OF RECEIPTS, DEPOSIT OF SHARES, EXECUTION AND DELIVERY,
            TRANSFER AND SURRENDER OF RECEIPTS.

         SECTION 2.01. Form and Transferability of Receipts.

                  Definitive Receipts shall be substantially in the form set
forth in Exhibit A annexed to this Deposit Agreement, with appropriate
insertions, modifications and omissions, as hereinafter provided. No Receipt
shall be entitled to any benefits under this Deposit Agreement or be valid or
obligatory for any purpose, unless such Receipt shall have been executed by the
Depositary by the manual or facsimile signature of a duly authorized signatory
of the Depositary. The Depositary shall maintain books on which each Receipt so
executed and delivered as hereinafter provided and the transfer of each such
Receipt shall be registered. Receipts bearing the manual or facsimile signature
of a duly authorized signatory of the Depositary who was at any time a proper
signatory of the Depositary shall bind the Depositary, notwithstanding that such
signatory has ceased to hold such office prior to the execution and delivery of
such Receipts by the Registrar or did not hold such office on the date of
issuance of such Receipts.

                  The Receipts may be endorsed with or have incorporated in the
text thereof such legends or recitals or modifications not inconsistent with the
provisions of this Deposit Agreement as may be required by the Depositary or
required to comply with any applicable law or regulations thereunder or with the
rules and regulations of any securities exchange upon which American Depositary
Shares may be listed or to conform with any usage with respect thereto, or to
indicate any special limitations or restrictions to which any particular
Receipts are subject by reason of the date of issuance of the underlying
Deposited Securities or otherwise.

                  Title to a Receipt (and to the American Depositary Shares
evidenced thereby), when properly endorsed or accompanied by proper instruments
of transfer, shall be transferable by delivery with the same effect as in the
case of a negotiable instrument; provided, however, that the Depositary,
notwithstanding any notice to the contrary, may treat the Owner thereof as the
absolute owner thereof for the purpose of determining the person entitled to
distribution of dividends or other distributions or to any notice provided for
in this Deposit Agreement and for all other purposes.

         SECTION 2.02. Deposit of Shares.

                  Subject to the terms and conditions of this Deposit Agreement,
Shares or evidence of rights to receive Shares may be deposited by (i) delivery
of certificates for Shares or (ii) electronic transfer of Shares through Indeval
to the account of the Custodian maintained for such purposes, in either case to
any Custodian hereunder, accompanied by any appropriate instrument or
instruments of transfer, or endorsement, in

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form satisfactory to the Custodian, together with all such certifications as may
be required by the Depositary or the Custodian in accordance with the provisions
of this Deposit Agreement, and, if the Depositary requires, together with a
written order directing the Depositary to execute and deliver to, or upon the
written order of, the person or persons stated in such order, a Receipt or
Receipts for the number of American Depositary Shares representing such deposit.
No Share shall be accepted for deposit unless accompanied by evidence
satisfactory to the Depositary that any necessary approval has been granted by
any governmental body in the United Mexican States which is then performing the
function of the regulation of currency exchange. If required by the Depositary,
Shares presented for deposit at any time, whether or not the transfer books of
the Company or the Foreign Registrar, if applicable, are closed, shall also be
accompanied by an agreement or assignment, or other instrument satisfactory to
the Depositary, which will provide for the prompt transfer to the Custodian of
any dividend, or right to subscribe for additional Shares or to receive other
property which any person in whose name the Shares are or have been recorded may
thereafter receive upon or in respect of such deposited Shares, or in lieu
thereof, such agreement of indemnity or other agreement as shall be satisfactory
to the Depositary.

                  At the request and risk and expense of any person proposing to
deposit Shares, and for the account of such person, the Depositary may receive
certificates for Shares to be deposited, together with the other instruments
herein specified, for the purpose of forwarding such Share certificates to the
Custodian for deposit hereunder.

                  Upon each delivery of Shares to be deposited hereunder to a
Custodian by either (i) a certificate or certificates or (ii) electronic
transfer, together with the other documents above specified, such Custodian
shall, as soon as transfer and recordation can be accomplished, present such
evidence of ownership to the Company or the Foreign Registrar, if applicable,
for transfer and recordation of the Shares being deposited in the name of the
Depositary or its nominee or such Custodian or its nominee.

                  Deposited Securities shall be held by the Depositary or by a
Custodian for the account and to the order of the Depositary or at such other
place or places as the Depositary shall determine.

         SECTION 2.03. Execution and Delivery of Receipts.

                  Upon receipt by any Custodian of any deposit pursuant to
Section 2.02 hereunder (and in addition, if the transfer books of the Company or
the Foreign Registrar, if applicable, are open, the Depositary may in its sole
discretion require a proper acknowledgment or other evidence from the Company
that any Deposited Securities have been recorded upon the books of the Company
or the Foreign Registrar, if applicable, in the name of the Depositary or its
nominee or such Custodian or its nominee), together with the other documents
required as above specified, such Custodian shall notify the Depositary of such
deposit and the person or persons to whom or upon whose written order a Receipt
or Receipts are deliverable in respect thereof and the number of American

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Depositary Shares to be evidenced thereby. Such notification shall be made by
letter or, at the request, risk and expense of the person making the deposit, by
cable, telex or facsimile transmission. Upon receiving such notice from such
Custodian, or upon the receipt of Shares by the Depositary, the Depositary,
subject to the terms and conditions of this Deposit Agreement, shall execute and
deliver at its Corporate Trust Office, to or upon the order of the person or
persons entitled thereto, a Receipt or Receipts, registered in the name or names
and evidencing any authorized number of American Depositary Shares requested by
such person or persons, but only upon payment to the Depositary of the fees of
the Depositary for the execution and delivery of such Receipt or Receipts as
provided in Section 5.09, and of all taxes and governmental charges and fees
payable in connection with such deposit and the transfer of the Deposited
Securities.

         SECTION 2.04. Transfer of Receipts; Combination and Split-up of
Receipts.

                  The Depositary, subject to the terms and conditions of this
Deposit Agreement, shall register transfers of Receipts on its transfer books
from time to time, upon any surrender of a Receipt, by the Owner in person or by
a duly authorized attorney, properly endorsed or accompanied by proper
instruments of transfer, and duly stamped as may be required by the laws of the
State of New York and of the United States of America. Thereupon the Depositary
shall execute a new Receipt or Receipts and deliver the same to or upon the
order of the person entitled thereto.

                  The Depositary, subject to the terms and conditions of this
Deposit Agreement, shall upon surrender of a Receipt or Receipts for the purpose
of effecting a split-up or combination of such Receipt or Receipts, execute and
deliver a new Receipt or Receipts for any authorized number of American
Depositary Shares requested, evidencing the same aggregate number of American
Depositary Shares as the Receipt or Receipts surrendered.

                  The Depositary may appoint one or more co-transfer agents for
the purpose of effecting transfers, combinations and split-ups of Receipts at
designated transfer offices on behalf of the Depositary. In carrying out its
functions, a co-transfer agent may require evidence of authority and compliance
with applicable laws and other requirements by Owners or persons entitled to
Receipts and will be entitled to protection and indemnity to the same extent as
the Depositary.

         SECTION 2.05. Surrender of Receipts and Withdrawal of Shares.

                  Upon surrender at the Corporate Trust Office of the Depositary
of a Receipt for the purpose of withdrawal of the Deposited Securities
represented by the American Depositary Shares evidenced by such Receipt, and
upon payment of the fee of the Depositary for the surrender of Receipts as
provided in Section 5.09 and payment of all taxes and governmental charges
payable in connection with such surrender and withdrawal of the Deposited
Securities, and subject to the terms and conditions of this Deposit Agreement,
the Owner of such Receipt shall be entitled to (i) physical delivery,

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to him or upon his order, or (ii) electronic transfer, through Indeval, to an
account in the name of the Owner or such other name as the Owner may direct, of
the amount of Deposited Securities at the time represented by the American
Depositary Shares evidenced by such Receipt. Such delivery shall be made, as
hereinafter provided, without unreasonable delay.

                  A Receipt surrendered for such purposes may be required by the
Depositary to be properly endorsed in blank or accompanied by proper instruments
of transfer in blank, and if the Depositary so requires, the Owner thereof shall
execute and deliver to the Depositary a written order directing the Depositary
to cause the Deposited Securities being withdrawn to be delivered to or upon the
written order of a person or persons designated in such order. Thereupon the
Depositary shall direct the Custodian to deliver at the Mexico City, Mexico,
office of such Custodian, subject to Sections 2.06, 3.01 and 3.02 and to the
other terms and conditions of this Deposit Agreement, to or upon the written
order of the person or persons designated in the order delivered to the
Depositary as above provided, the amount of Deposited Securities represented by
the American Depositary Shares evidenced by such Receipt, except that the
Depositary may make delivery to such person or persons at the Corporate Trust
Office of the Depositary of any dividends or distributions with respect to the
Deposited Securities represented by the American Depositary Shares evidenced by
such Receipt, or of any proceeds of sale of any dividends, distributions or
rights, which may at the time be held by the Depositary.

                  At the request, risk and expense of any Owner so surrendering
a Receipt, and for the account of such Owner, the Depositary shall direct the
Custodian to forward any cash or other property (other than rights) comprising,
and forward a certificate or certificates and other proper documents of title
for, the Deposited Securities represented by the American Depositary Shares
evidenced by such Receipt to the Depositary for delivery at the Corporate Trust
Office of the Depositary. Such direction shall be given by letter or, at the
request, risk and expense of such Owner, by cable, telex or facsimile
transmission.

         SECTION 2.06. Limitations on Execution and Delivery, Transfer and
Surrender of Receipts.

                  As a condition precedent to the execution and delivery,
registration of transfer, split-up, combination or surrender of any Receipt or
withdrawal of any Deposited Securities, the Depositary, Custodian or Registrar
may require payment from the depositor of Shares or the presentor of the Receipt
of a sum sufficient to reimburse it for any tax or other governmental charge and
any stock transfer or registration fee with respect thereto (including any such
tax or charge and fee with respect to Shares being deposited or withdrawn) and
payment of any applicable fees as herein provided, may require the production of
proof satisfactory to it as to the identity and genuineness of any signature and
may also require compliance with any regulations the Depositary may

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<PAGE>   11
establish consistent with the provisions of this Deposit Agreement, including,
without limitation, this Section 2.06.

                  The delivery of Receipts against deposits of Shares generally
or against deposits of particular Shares may be suspended, or the transfer of
Receipts in particular instances may be refused, or the registration of transfer
of outstanding Receipts generally may be suspended, during any period when the
transfer books of the Depositary are closed, or if any such action is deemed
necessary or advisable by the Depositary or the Company at any time or from time
to time because of any requirement of law or of any government or governmental
body or commission, or under any provision of this Deposit Agreement, or for any
other reason, subject to the provisions of the following sentence. The surrender
of outstanding Receipts and withdrawal of Deposited Securities may not be
suspended subject only to (i) temporary delays caused by closing the transfer
books of the Depositary or the Company or the deposit of Shares in connection
with voting at a shareholders' meeting, or the payment of dividends, (ii) the
payment of fees, taxes and similar charges, and (iii) compliance with any U.S.
or foreign laws or governmental regulations relating to the Receipts or to the
withdrawal of the Deposited Securities. Without limitation of the foregoing, the
Depositary shall not knowingly accept for deposit under this Deposit Agreement
any Shares required to be registered under the provisions of the Securities Act
of 1933, unless a registration statement is in effect as to such Shares.

         SECTION 2.07. Lost Receipts, etc.

                  In case any Receipt shall be mutilated, destroyed, lost or
stolen, the Depositary shall execute and deliver a new Receipt of like tenor in
exchange and substitution for such mutilated Receipt upon cancellation thereof,
or in lieu of and in substitution for such destroyed, lost or stolen Receipt.
Before the Depositary shall execute and deliver a new Receipt in substitution
for a destroyed, lost or stolen Receipt, the Owner thereof shall have (a) filed
with the Depositary (i) a request for such execution and delivery before the
Depositary has notice that the Receipt has been acquired by a bona fide
purchaser and (ii) a sufficient indemnity bond and (b) satisfied any other
reasonable requirements imposed by the Depositary.

         SECTION 2.08. Cancellation and Destruction of Surrendered Receipts.

                  All Receipts surrendered to the Depositary shall be cancelled
by the Depositary. The Depositary is authorized to destroy Receipts so
cancelled.

         SECTION 2.09. Pre-Release of Receipts.

                  Notwithstanding Section 2.03 hereof, the Depositary may
execute and deliver Receipts prior to the receipt of Shares pursuant to Section
2.02 ("Pre-Release"). The Depositary may, pursuant to Section 2.05, deliver
Shares upon the receipt and cancellation of Receipts which have been
Pre-Released, whether or not such cancellation

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is prior to the termination of such Pre-Release or the Depositary knows that
such Receipt has been Pre-Released. The Depositary may receive Receipts in lieu
of Shares in satisfaction of a Pre-Release. Each Pre-Release will be (a)
preceded or accompanied by a written representation from the person to whom
Receipts are to be delivered that such person, or its customer, owns the Shares
or Receipts to be remitted, as the case may be, (b) at all times fully
collateralized with cash or such other collateral as the Depositary deems
appropriate, (c) terminable by the Depositary on not more than five (5) business
days notice, and (d) subject to such further indemnities and credit regulations
as the Depositary deems appropriate. The number of American Depositary Shares
which are outstanding at any time as a result of Pre-Releases will not normally
exceed thirty percent (30%) of the Shares deposited hereunder; provided,
however, that the Depositary reserves the right to change or disregard such
limit from time to time as it deems appropriate.

                  The Depositary may retain for its own account any compensation
received by it in connection with the foregoing.

ARTICLE 3. CERTAIN OBLIGATIONS OF OWNERS OF RECEIPTS.

         SECTION 3.01. Filing Proofs, Certificates and Other Information.

                  Any person presenting Shares for deposit or any Owner of a
Receipt may be required from time to time to file with the Depositary or the
Custodian such proof of citizenship or residence, exchange control approval, or
such information relating to the registration on the books of the Company or the
Foreign Registrar, if applicable, to execute such certificates and to make such
representations and warranties, as the Depositary may deem necessary or proper.
The Depositary may withhold the delivery or registration of transfer of any
Receipt or the distribution of any dividend or sale or distribution of rights or
of the proceeds thereof or the delivery of any Deposited Securities until such
proof or other information is filed or such certificates are executed or such
representations and warranties made.

         SECTION 3.02. Liability of Owner for Taxes.

                  If any tax or other governmental charge shall become payable
with respect to any Receipt or any Deposited Securities represented by any
Receipt, such tax or other governmental charge shall be payable by the Owner of
such Receipt to the Depositary. The Depositary may refuse to effect any transfer
of such Receipt or any withdrawal of Deposited Securities represented by
American Depositary Shares evidenced by such Receipt until such payment is made,
and may withhold any dividends or other distributions, or may sell for the
account of the Owner thereof any part or all of the Deposited Securities
represented by the American Depositary Shares evidenced by such Receipt, and may
apply such dividends or other distributions or the proceeds of any such sale in
payment of such tax or other governmental charge and the Owner of such Receipt
shall remain liable for any deficiency.

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         SECTION 3.03. Warranties on Deposit of Shares.

                  Every person depositing Shares under this Deposit Agreement
shall be deemed thereby to represent and warrant that such Shares and each
certificate therefor are validly issued, fully paid, nonassessable and free of
any pre-emptive rights of the holders of outstanding Shares and that the person
making such deposit is duly authorized so to do. Every such person shall also be
deemed to represent that the deposit of such Shares and the sale of Receipts
evidencing American Depositary Shares representing such Shares by that person
are not restricted under the Securities Act of 1933. Such representations and
warranties shall survive the deposit of Shares and issuance of Receipts.

ARTICLE 4. THE DEPOSITED SECURITIES.

         SECTION 4.01. Cash Distributions.

                  Whenever the Depositary shall receive any cash dividend or
other cash distribution on any Deposited Securities, the Depositary shall,
subject to the provisions of Section 4.05, convert such dividend or distribution
into Dollars and shall distribute the amount thus received (net of the expenses
of the Depositary as provided in Section 5.09) to the Owners entitled thereto,
in proportion to the number of American Depositary Shares representing such
Deposited Securities held by them respectively; provided, however, that in the
event that the Company or the Depositary shall be required to withhold and does
withhold from such cash dividend or such other cash distribution an amount on
account of taxes, the amount distributed to the Owner of the Receipts evidencing
American Depositary Shares representing such Deposited Securities shall be
reduced accordingly. The Depositary shall distribute only such amount, however,
as can be distributed without attributing to any Owner a fraction of one cent.
Any such fractional amounts shall be rounded to the nearest whole cent and so
distributed to Owners entitled thereto. The Company or its agent will remit to
the appropriate governmental agency in Mexico all amounts withheld and owing to
such agency. The Depositary will forward to the Company or its agent such
information from its records as the Company may reasonably request to enable the
Company or its agent to file necessary reports with governmental agencies, and
the Depositary or the Company or its agent may file any such reports necessary
to obtain benefits under the applicable tax treaties for the Owners of Receipts.

         SECTION 4.02. Distributions Other Than Cash, Shares or Rights.

                  Subject to the provisions of Sections 4.11 and 5.09, whenever
the Depositary shall receive any distribution other than a distribution
described in Sections 4.01, 4.03 or 4.04, the Depositary shall cause the
securities or property received by it to be distributed to the Owners entitled
thereto, in proportion to the number of American Depositary Shares representing
such Deposited Securities held by them respectively, in any manner that the
Depositary may deem equitable and practicable for accomplishing

                                      -10-
<PAGE>   14
such distribution; provided, however, that if in the opinion of the Depositary
such distribution cannot be made proportionately among the Owners entitled
thereto, or if for any other reason (including, but not limited to, any
requirement that the Company or the Depositary withhold an amount on account of
taxes or other governmental charges or that such securities must be registered
under the Securities Act of 1933 in order to be distributed to Owners or
holders) the Depositary deems such distribution not to be feasible, the
Depositary may adopt such method as it may deem equitable and practicable for
the purpose of effecting such distribution, including, but not limited to, the
public or private sale of the securities or property thus received, or any part
thereof, and the net proceeds of any such sale (net of the fees of the
Depositary as provided in Section 5.09) shall be distributed by the Depositary
to the Owners entitled thereto as in the case of a distribution received in
cash.

         SECTION 4.03. Distributions in Shares.

                  If any distribution upon any Deposited Securities consists of
a dividend in, or free distribution of, Shares, the Depositary may, and shall if
the Company shall so request, distribute to the Owners of outstanding Receipts
entitled thereto, in proportion to the number of American Depositary Shares
representing such Deposited Securities held by them respectively, additional
Receipts evidencing an aggregate number of American Depositary Shares
representing the amount of Shares received as such dividend or free
distribution, subject to the terms and conditions of the Deposit Agreement with
respect to the deposit of Shares and the issuance of American Depositary Shares
evidenced by Receipts, including the withholding of any tax or other
governmental charge as provided in Section 4.11 and the payment of the fees of
the Depositary as provided in Section 5.09. In lieu of delivering Receipts for
fractional American Depositary Shares in any such case, the Depositary shall
sell the amount of Shares represented by the aggregate of such fractions and
distribute the net proceeds, all in the manner and subject to the conditions
described in Section 4.01. If additional Receipts are not so distributed, each
American Depositary Share shall thenceforth also represent the additional Shares
distributed upon the Deposited Securities represented thereby.

         SECTION 4.04. Rights.

                  In the event that the Company shall offer or cause to be
offered to the holders of any Deposited Securities any rights to subscribe for
additional Shares or any rights of any other nature, the Depositary shall have
discretion as to the procedure to be followed in making such rights available to
any Owners or in disposing of such rights on behalf of any Owners and making the
net proceeds available to such Owners or, if by the terms of such rights
offering or for any other reason, the Depositary may not either make such rights
available to any Owners or dispose of such rights and make the net proceeds
available to such Owners, then the Depositary shall allow the rights to lapse.
If at the time of the offering of any rights the Depositary determines in its
discretion that it is lawful and feasible to make such rights available to all
or certain Owners but not to other

                                      -11-
<PAGE>   15
Owners, the Depositary may distribute to any Owner to whom it determines the
distribution to be lawful and feasible, in proportion to the number of American
Depositary Shares held by such Owner, warrants or other instruments therefor in
such form as it deems appropriate.

                  In circumstances in which rights would otherwise not be
distributed, if an Owner of Receipts requests the distribution of warrants or
other instruments in order to exercise the rights allocable to the American
Depositary Shares of such Owner hereunder, the Depositary will make such rights
available to such Owner upon written notice from the Company to the Depositary
that (a) the Company has elected in its sole discretion to permit such rights to
be exercised and (b) such Owner has executed such documents as the Company has
determined in its sole discretion are reasonably required under applicable law
and the opinion referred to below.

                  Subject to applicable law and as agreed to by the Company and
the Depositary in each instance, the Depositary shall also assist the Company in
making private placements or other limited offerings of rights and the
securities offered thereby upon the request of the Company.

                  If the Depositary has distributed warrants or other
instruments for rights to all or certain Owners, then upon instruction from such
an Owner pursuant to such warrants or other instruments to the Depositary from
such Owner to exercise such rights, upon payment by such Owner to the Depositary
for the account of such Owner of an amount equal to the purchase price of the
Shares to be received upon the exercise of the rights, and upon payment of the
fees of the Depositary and any other charges as set forth in such warrants or
other instruments, the Depositary shall, on behalf of such Owner, exercise the
rights and purchase the Shares, and the Company shall cause the Shares so
purchased to be delivered to the Depositary on behalf of such Owner. As agent
for such Owner, the Depositary will cause the Shares so purchased to be
deposited pursuant to Section 2.02 of this Deposit Agreement, and shall,
pursuant to Section 2.03 of this Deposit Agreement, execute and deliver Receipts
to such Owner. In the case of a distribution pursuant to the second or third
paragraph of this section, such Receipts shall be legended as reasonably
requested by the Company in accordance with applicable U.S. laws as appropriate,
and shall be subject to the appropriate restrictions on sale, deposit,
cancellation, and transfer under such laws.

                  If the Depositary determines in its discretion that it is not
lawful and feasible to make such rights available to all or certain Owners, it
may sell the rights, warrants or other instruments in proportion to the number
of American Depositary Shares held by the Owners to whom it has determined it
may not lawfully or feasibly make such rights available, and allocate the net
proceeds of such sales (net of the fees of the Depositary as provided in Section
5.09 and all taxes and governmental charges payable in connection with such
rights and subject to the terms and conditions of this Deposit Agreement) for
the account of such Owners otherwise entitled to such rights, warrants or

                                      -12-
<PAGE>   16
other instruments, upon an averaged or other practical basis without regard to
any distinctions among such Owners because of exchange restrictions or the date
of delivery of any Receipt or otherwise.

                  The Depositary will not offer rights to Owners unless both the
rights and the securities to which such rights relate are either exempt from
registration under the Securities Act of 1933 with respect to a distribution to
all Owners or are registered under the provisions of such Act. If an Owner of
Receipts requests the distribution of warrants or other instruments,
notwithstanding that there has been no such registration under such Act, the
Depositary shall not effect such distribution unless it has received an opinion
from recognized counsel in the United States for the Company upon which the
Depositary may rely that such distribution to such Owner is exempt from such
registration.

                  The Depositary shall not be responsible to Owners for any
failure to determine that it may be lawful or feasible to make such rights
available to Owners in general or any Owner in particular.

         SECTION 4.05. Conversion of Foreign Currency.

                  Whenever the Depositary shall receive foreign currency, by way
of dividends or other distributions or the net proceeds from the sale of
securities, property or rights, and if at the time of the receipt thereof the
foreign currency so received can in the judgment of the Depositary be converted
on a reasonable basis into Dollars and the resulting Dollars transferred to the
United States, the Depositary shall convert or cause to be converted, by sale or
in any other manner that it may determine, such foreign currency into Dollars,
and such Dollars shall be distributed to the Owners entitled thereto or, if the
Depositary shall have distributed any warrants or other instruments which
entitle the holders thereof to such Dollars, then to the holders of such
warrants and/or instruments upon surrender thereof for cancellation. Such
distribution may be made upon an averaged or other practicable basis without
regard to any distinctions among Owners on account of exchange restrictions, the
date of delivery of any Receipt or otherwise and shall be net of any expenses of
conversion into Dollars incurred by the Depositary as provided in Section 5.09.

                  If such conversion or distribution can be effected only with
the approval or license of any government or agency thereof, the Depositary
shall file such application for approval or license, if any, as it may deem
desirable.

                  If at any time the Depositary shall determine that in its
judgment any foreign currency received by the Depositary is not convertible on a
reasonable basis into Dollars transferable to the United States, or if any
approval or license of any government or agency thereof which is required for
such conversion is denied or in the opinion of the Depositary is not obtainable,
or if any such approval or license is not obtained within a reasonable period as
determined by the Depositary, the Depositary may distribute the

                                      -13-
<PAGE>   17
foreign currency (or an appropriate document evidencing the right to receive
such foreign currency) received by the Depositary to, or in its discretion may
hold such foreign currency uninvested and without liability for interest thereon
for the respective accounts of, the Owners entitled to receive the same.

                  If any such conversion of foreign currency, in whole or in
part, cannot be effected for distribution to some of the Owners entitled
thereto, the Depositary may in its discretion make such conversion and
distribution in Dollars to the extent permissible to the Owners entitled thereto
and may distribute the balance of the foreign currency received by the
Depositary to, or hold such balance uninvested and without liability for
interest thereon for the respective accounts of, the Owners entitled thereto.

         SECTION 4.06. Fixing of Record Date.

                  Whenever any cash dividend or other cash distribution shall
become payable or any distribution other than cash shall be made, or whenever
rights shall be issued with respect to the Deposited Securities, or whenever for
any reason the Depositary causes a change in the number of Shares that are
represented by each American Depositary Share, or whenever the Depositary shall
receive notice of any meeting of holders of Shares or other Deposited
Securities, the Depositary shall fix a record date (a) for the determination of
the Owners who shall be (i) entitled to receive such dividend, distribution or
rights or the net proceeds of the sale thereof or (ii) entitled to give
instructions for the exercise of voting rights at any such meeting, or (b) on or
after which each American Depositary Share will represent the changed number of
Shares. Subject to the provisions of Sections 4.01 through 4.05 and to the other
terms and conditions of this Deposit Agreement, the Owners on such record date
shall be entitled, as the case may be, to receive the amount distributable by
the Depositary with respect to such dividend or other distribution or such
rights or the net proceeds of sale thereof in proportion to the number of
American Depositary Shares held by them respectively and to give voting
instructions and to act in respect of any other such matter.

         SECTION 4.07. Voting of Deposited Securities.

                  Under the Company's By-laws (Estatutos Sociales), the Shares
represented by the American Depositary Shares evidenced by the Receipts may be
voted only in certain limited circumstances. Other than the right to elect one
director, Owners may be entitled to instruct the Depositary to vote the Shares
represented by the American Depositary Shares evidenced by their Receipts at any
extraordinary general Shareholders' meeting but only with respect to certain
changes in the legal structure of the Company, certain mergers or the
cancellation of the registration of the Shares on any Mexican or foreign stock
exchange. Except as described above, Owners have no voting rights.

                  Upon receipt of notice of any meeting of holders of Shares or
other Deposited Securities, if requested in writing by the Company the
Depositary shall, as soon as practicable thereafter, mail to the Owners a
notice, the form of which notice shall

                                      -14-
<PAGE>   18
be in the sole discretion of the Depositary, which shall contain (a) such
information as is contained in such notice of meeting, (b) a statement that the
Owners as of the close of business on a specified record date will be entitled,
subject to any applicable provision of Mexican law and of the Estatutos Sociales
of the Company, to instruct the Depositary as to the exercise of the voting
rights, if any, pertaining to the amount of Shares or other Deposited Securities
represented by their respective American Depositary Shares and (c) a statement
as to the manner in which such instructions may be given, (or deemed given in
accordance with the last sentence of this Section 4.07 if no instruction is
received) to the Depositary. Upon the written request of an Owner on such record
date, received on or before the date established by the Depositary for such
purpose, the Depositary shall endeavor, in so far as practicable, to vote or
cause to be voted the amount of Shares or other Deposited Securities represented
by the American Depositary Shares evidenced by such Receipt in accordance with
the instructions set forth in such request. The Depositary shall not vote or
attempt to exercise any right to vote that attaches to the Shares or other
Deposited Securities, other than in accordance with such instructions and/or the
provisions of the following sentence. If, after complying with the procedures
set forth in this Section 4.07, the Depositary does not receive instructions
from the Owners of any Receipts on or before the date established by the
Depositary for such purpose, the Depositary shall give a proxy for the Shares
represented by the American Depositary Shares evidenced by such Receipts to a
person designated by the Company to vote such Shares in regard to any matter in
the same proportions as all of the other Shares that are voted with regard to
such matter.

         SECTION 4.08. Changes Affecting Deposited Securities.

                  In circumstances where the provisions of Section 4.03 do not
apply, upon any change in nominal value, change in par value, split-up,
consolidation or any other reclassification of Deposited Securities, or upon any
recapitalization, reorganization, merger or consolidation or sale of assets
affecting the Company or to which it is a party, any securities which shall be
received by the Depositary or a Custodian in exchange for or in conversion of or
in respect of Deposited Securities, shall be treated as new Deposited Securities
under this Deposit Agreement, and American Depositary Shares shall thenceforth
represent the new Deposited Securities so received in exchange or conversion,
unless additional Receipts are delivered pursuant to the following sentence. In
any such case the Depositary may, and shall if the Company shall so request,
execute and deliver additional Receipts as in the case of a dividend in Shares,
or call for the surrender of outstanding Receipts to be exchanged for new
Receipts specifically describing such new Deposited Securities.

         SECTION 4.09. Reports.

                  The Depositary shall make available for inspection by Owners
at its Corporate Trust Office any reports and communications, including any
proxy soliciting material, received from the Company which are both (a) received
by the Depositary as

                                      -15-
<PAGE>   19
the holder of the Deposited Securities and (b) made generally available to the
holders of such Deposited Securities by the Company. The Depositary shall also
send to the Owners copies of such reports when furnished by the Company pursuant
to Section 5.06. Any such reports and communications, including any such proxy
soliciting material, furnished to the Depositary by the Company shall be
furnished in English, to the extent such materials are required to be translated
into English pursuant to any regulations of the Commission.

                  The Company is subject to the reporting requirements of the
Securities Exchange Act of 1934 and accordingly files certain reports with the
Securities and Exchange Commission (the "Commission"). Such reports and
communications will be available for inspection and copying by holders and
Owners at the public reference facilities maintained by the Commission located
at 450 Fifth Street, N.W., Washington, D.C. 20549.

         SECTION 4.10. Lists of Owners.

                  Promptly upon request by the Company, the Depositary shall, at
the expense of the Company, furnish to it a list, as of a recent date, of the
names, addresses and holdings of American Depositary Shares by all persons in
whose names Receipts are registered on the books of the Depositary.

         SECTION 4.11. Withholding.

                  In the event that the Depositary determines that any
distribution in property (including Shares and rights to subscribe therefor) is
subject to any tax or other governmental charge which the Depositary is
obligated to withhold, the Depositary may by public or private sale dispose of
all or a portion of such property (including Shares and rights to subscribe
therefor) in such amounts and in such manner as the Depositary deems necessary
and practicable to pay any such taxes or charges and the Depositary shall
distribute the net proceeds of any such sale after deduction of such taxes or
charges to the Owners entitled thereto in proportion to the number of American
Depositary Shares held by them respectively.

         SECTION 4.12. Exchange Offer.

                  The parties to this Deposit Agreement hereby acknowledge that
pursuant to the Prospectus dated ____________, 1999 (the "Prospectus"), Nuevo
Grupo Iusacell, S.A. de C.V. has offered to exchange (i) one Series V American
Depositary Share of Nuevo Grupo Iusacell, S.A. de C.V. ("Series V ADSs"), which
Series V ADSs were issued under the deposit agreement dated as of July 6, 1999,
among Nuevo Grupo Iusacell, S.A. de C.V., the Depositary, and Owners and holders
thereof (the "Series V Deposit Agreement"), for every one American Depositary
Shares of the Company and (ii) one Series V share of Nuevo Grupo Iusacell, S.A.
de C.V. ("Series V Shares") for every one Share of the Company. Such offer is
referred to as the "Exchange Offer".

                                      -16-
<PAGE>   20
                  Each Holder of a Receipt outstanding on the day the offer
period for the Exchange Offer expires as described in the Prospectus (the
"Exchange Offer Expiration Date") will be deemed to have authorized and
instructed the Depositary to tender in the Exchange Offer the number of Shares
represented by such Holder's American Depositary Shares, and the Depositary
shall, subject to applicable law and the terms of the Exchange Offer, so tender
such Shares on behalf of such Holder unless otherwise instructed by the Company.

                  It is hereby acknowledged that after the Exchange Offer
Expiration Date, the Depositary will deliver without unreasonable delay Series V
ADSs pursuant to the Series V Deposit Agreement in respect of tendered Receipts.
However, it is further acknowledged that, during the period beginning at the
Exchange Offer Expiration Date until the time Series V Shares are delivered to
the Depositary by Nuevo Grupo Iusacell, S.A. de C.V. pursuant to consummation of
the Exchange Offer, it will not be possible for the Depositary to deliver any
Series V ADSs against surrender of Receipts. Cash in lieu of fractional shares,
if any, will subsequently be delivered by the Depositary.

                  It is further hereby acknowledged that the Series V Shares
delivered to the Depositary pursuant to the deemed authorization to tender in
this Section 4.12 will constitute Deposited Securities for purposes of Section
6.2 of this Deposit Agreement.

ARTICLE 5. THE DEPOSITARY, THE CUSTODIANS AND THE COMPANY.

         SECTION 5.01. Maintenance of Office and Transfer Books by the
Depositary.

                  Until termination of this Deposit Agreement in accordance with
its terms, the Depositary shall maintain in the Borough of Manhattan, The City
of New York, facilities for the execution and delivery, registration,
registration of transfers and surrender of Receipts in accordance with the
provisions of this Deposit Agreement.

                  The Depositary shall keep books for the registration of
Receipts and transfers of Receipts which at all reasonable times shall be open
for inspection by the Owners, provided that such inspection shall not be for the
purpose of communicating with Owners in the interest of a business or object
other than the business of the Company or a matter related to this Deposit
Agreement or the Receipts.

                  The Depositary may close the transfer books, at any time or
from time to time, when deemed expedient by it in connection with the
performance of its duties hereunder.

                  If any Receipts or the American Depositary Shares evidenced
thereby are listed on one or more stock exchanges in the United States, the
Depositary shall act as

                                      -17-
<PAGE>   21
Registrar or appoint a Registrar or one or more co-registrars for registry of
such Receipts in accordance with any requirements of such exchange or exchanges.

         SECTION 5.02. Prevention or Delay in Performance by the Depositary or
the Company.

                  Neither the Depositary nor the Company shall incur any
liability to any Owner or holder of any Receipt, if by reason of any provision
of any present or future law or regulation of the United States or any other
country, or of any governmental or regulatory authority or stock exchange, or by
reason of any provision, present or future, of the Estatutos Sociales of the
Company, or by reason of any act of God or war or other circumstances beyond its
control, the Depositary or the Company shall be prevented or forbidden from, or
be subject to any civil or criminal penalty on account of, doing or performing
any act or thing which by the terms of this Deposit Agreement it is provided
shall be done or performed; nor shall the Depositary or the Company incur any
liability to any Owner or holder of any Receipt by reason of any non-performance
or delay, caused as aforesaid, in the performance of any act or thing which by
the terms of this Deposit Agreement it is provided shall or may be done or
performed, or by reason of any exercise of, or failure to exercise, any
discretion provided for in this Deposit Agreement. Where, by the terms of a
distribution pursuant to Sections 4.01, 4.02, or 4.03 of the Deposit Agreement,
or an offering or distribution pursuant to Section 4.04 of the Deposit
Agreement, or for any other reason, such distribution or offering may not be
made available to Owners, and the Depositary may not dispose of such
distribution or offering on behalf of such Owners and make the net proceeds
available to such Owners, then the Depositary shall not make such distribution
or offering, and shall allow any rights, if applicable, to lapse.

         SECTION 5.03. Obligations of the Depositary, the Custodian and the
Company.

                  The Company assumes no obligation nor shall it be subject to
any liability under this Deposit Agreement to Owners or holders of Receipts,
except that it agrees to perform its obligations specifically set forth in this
Deposit Agreement without negligence or bad faith.

                  The Depositary assumes no obligation nor shall it be subject
to any liability under this Deposit Agreement to any Owner or holder of any
Receipt (including, without limitation, liability with respect to the validity
or worth of the Deposited Securities), except that it agrees to perform its
obligations specifically set forth in this Deposit Agreement without negligence
or bad faith.

                  Neither the Depositary nor the Company shall be under any
obligation to appear in, prosecute or defend any action, suit or other
proceeding in respect of any Deposited Securities or in respect of the Receipts,
which in its opinion may involve it in expense or liability, unless indemnity
satisfactory to it against all expense and liability shall be furnished as often
as may be required, and the Custodian shall not be under any

                                      -18-
<PAGE>   22
obligation whatsoever with respect to such proceedings, the responsibility of
the Custodian being solely to the Depositary.

                  Neither the Depositary nor the Company shall be liable for any
action or nonaction by it in reliance upon the advice of or information from
legal counsel, accountants, any person presenting Shares for deposit, any Owner
or any other person believed by it in good faith to be competent to give such
advice or information.

                  The Depositary shall not be liable for any acts or omissions
made by a successor depositary whether in connection with a previous act or
omission of the Depositary or in connection with any matter arising wholly after
the removal or resignation of the Depositary, provided that in connection with
the issue out of which such potential liability arises the Depositary performed
its obligations without negligence or bad faith while it acted as Depositary.

                  The Depositary shall not be responsible for any failure to
carry out any instructions to vote any of the Deposited Securities, or for the
manner in which any such vote is cast or the effect of any such vote, provided
that any such action or nonaction is in good faith and without negligence.

                  No disclaimer of liability under the Securities Act of 1933 is
intended by any provision of this Deposit Agreement.

         SECTION 5.04. Resignation and Removal of the Depositary.

                  The Depositary may at any time resign as Depositary hereunder
by written notice of its election so to do delivered to the Company, such
resignation to take effect upon the appointment of a successor depositary and
its acceptance of such appointment as hereinafter provided.

                  The Depositary may at any time be removed by the Company by
written notice of such removal effective upon the appointment of a successor
depositary and its acceptance of such appointment as hereinafter provided.

                  In case at any time the Depositary acting hereunder shall
resign or be removed, the Company shall use its best efforts to appoint a
successor depositary, which shall be a bank or trust company having an office in
the Borough of Manhattan, The City of New York. Every successor depositary shall
execute and deliver to its predecessor and to the Company an instrument in
writing accepting its appointment hereunder, and thereupon such successor
depositary, without any further act or deed, shall become fully vested with all
the rights, powers, duties and obligations of its predecessor; but such
predecessor, nevertheless, upon payment of all sums due it and on the written
request of the Company shall execute and deliver an instrument transferring to
such successor all rights and powers of such predecessor hereunder, shall duly
assign, transfer and deliver all right, title and interest in the Deposited
Securities to such successor, and shall deliver

                                      -19-
<PAGE>   23
to such successor a list of the Owners of all outstanding Receipts. Any such
successor depositary shall promptly mail notice of its appointment to the
Owners.

                  Any corporation into or with which the Depositary may be
merged or consolidated shall be the successor of the Depositary without the
execution or filing of any document or any further act.

         SECTION 5.05. The Custodians.

                  The Custodian shall be subject at all times and in all
respects to the directions of the Depositary and shall be responsible solely to
it. Any Custodian may resign and be discharged from its duties hereunder by
notice of such resignation delivered to the Depositary at least 30 days prior to
the date on which such resignation is to become effective. If upon such
resignation there shall be no Custodian acting hereunder, the Depositary shall,
promptly after receiving such notice, appoint a substitute custodian or
custodians, each of which shall thereafter be a Custodian hereunder. Whenever
the Depositary in its discretion determines that it is in the best interest of
the Owners to do so, it may appoint substitute or additional custodian or
custodians, which shall thereafter be one of the Custodians hereunder. Upon
demand of the Depositary any Custodian shall deliver such of the Deposited
Securities held by it as are requested of it to any other Custodian or such
substitute or additional custodian or custodians. Each such substitute or
additional custodian shall deliver to the Depositary, forthwith upon its
appointment, an acceptance of such appointment satisfactory in form and
substance to the Depositary.

                  Upon the appointment of any successor depositary hereunder,
each Custodian then acting hereunder shall forthwith become, without any further
act or writing, the agent hereunder of such successor depositary and the
appointment of such successor depositary shall in no way impair the authority of
each Custodian hereunder; but the successor depositary so appointed shall,
nevertheless, on the written request of any Custodian, execute and deliver to
such Custodian all such instruments as may be proper to give to such Custodian
full and complete power and authority as agent hereunder of such successor
depositary.

         SECTION 5.06. Notices and Reports.

                  On or before the first date on which the Company gives notice,
by publication or otherwise, of any meeting of holders of Shares or other
Deposited Securities, or of any adjourned meeting of such holders, or of the
taking of any action in respect of any cash or other distributions or the
offering of any rights, the Company agrees to transmit to the Depositary and the
Custodian a copy of the notice thereof in the form given or to be given to
holders of Shares or other Deposited Securities.

                  The Company will arrange for the translation into English, if
not already in English, to the extent required pursuant to any regulations of
the Commission, and the prompt transmittal by the Company to the Depositary and
the Custodian of such notices

                                      -20-
<PAGE>   24
and any other reports and communications which are made generally available by
the Company to holders of its Shares. If requested in writing by the Company,
the Depositary will arrange for the mailing, at the Company's expense, of copies
of such notices, reports and communications to all Owners. The Company will
timely provide the Depositary with the quantity of such notices, reports, and
communications, as requested by the Depositary from time to time, in order for
the Depositary to effect such mailings.

         SECTION 5.07. Distribution of Additional Shares, Rights, etc.

                  The Company agrees that in the event of any issuance or
distribution of (1) additional Shares, (2) rights to subscribe for Shares, (3)
securities convertible into Shares, or (4) rights to subscribe for such
securities, (each a "Distribution") the Company will promptly furnish to the
Depositary a written opinion from U.S. counsel for the Company, which counsel
shall be satisfactory to the Depositary, stating whether or not the Distribution
requires a Registration Statement under the Securities Act of 1933 to be in
effect prior to making such Distribution available to Owners entitled thereto.
If in the opinion of such counsel a Registration Statement is required, such
counsel shall furnish to the Depositary a written opinion as to whether or not
there is a Registration Statement in effect which will cover such Distribution.

                  The Company agrees with the Depositary that neither the
Company nor any company controlled by, controlling or under common control with
the Company will at any time deposit any Shares, either originally issued or
previously issued and reacquired by the Company or any such affiliate, unless a
Registration Statement is in effect as to such Shares under the Securities Act
of 1933.

         SECTION 5.08. Indemnification.

                  The Company agrees to indemnify the Depositary, its directors,
employees, agents and affiliates and any Custodian against, and hold each of
them harmless from, any liability or expense (including, but not limited to, the
fees and expenses of counsel) which may arise out of acts performed or omitted,
in accordance with the provisions of this Deposit Agreement and of the Receipts,
as the same may be amended, modified or supplemented from time to time, (i) by
either the Depositary or a Custodian or their respective directors, employees,
agents and affiliates, except for any liability or expense arising out of the
negligence or bad faith of either of them, or (ii) by the Company or any of its
directors, employees, agents and affiliates.

                  The Depositary agrees to indemnify the Company, its directors,
employees, agents and affiliates and hold them harmless from any liability or
expense which may arise out of acts performed or omitted by the Depositary or
its Custodian or their respective directors, employees, agents and affiliates
due to their negligence or bad faith.

                                      -21-
<PAGE>   25
         SECTION 5.09. Charges of Depositary.

                  The Company agrees to pay the fees, reasonable expenses and
out-of-pocket charges of the Depositary and those of any Registrar only in
accordance with agreements in writing entered into between the Depositary and
the Company from time to time. The Depositary shall present its statement for
such charges and expenses to the Company once every three months. The charges
and expenses of the Custodian are for the sole account of the Depositary.

                  The following charges shall be incurred by any party
depositing or withdrawing Shares or by any party surrendering Receipts or to
whom Receipts are issued (including, without limitation, issuance pursuant to a
stock dividend or stock split declared by the Company or an exchange of stock
regarding the Receipts or Deposited Securities or a distribution of Receipts
pursuant to Section 4.03), whichever applicable: (1) taxes and other
governmental charges, (2) such registration fees as may from time to time be in
effect for the registration of transfers of Shares generally on the Share
register of the Company, Foreign Registrar or Indeval and applicable to
transfers of Shares to the name of the Depositary or its nominee or the
Custodian or its nominee on the making of deposits or withdrawals hereunder, (3)
such cable, telex and facsimile transmission expenses as are expressly provided
in this Deposit Agreement, (4) such expenses as are incurred by the Depositary
in the conversion of foreign currency pursuant to Section 4.05, (5) a fee not in
excess of $5.00 per 100 American Depositary Shares (or portion thereof) for the
execution and delivery of Receipts pursuant to Sections 2.03 or 4.03 and the
surrender of Receipts pursuant to Section 2.05 and (6) a fee not in excess of
$2.00 per 100 American Depositary Shares (or portion thereof) for, and deduct
such fee from, the distribution of proceeds of sales of securities or rights
pursuant to Sections 4.02 or 4.04, respectively.

                  The Depositary, subject to Section 2.09 hereof, may own and
deal in any class of securities of the Company and its affiliates and in
Receipts.

         SECTION 5.10. Retention of Depositary Documents.

                  The Depositary is authorized to destroy those documents,
records, bills and other data compiled during the term of this Deposit Agreement
at the times permitted by the laws or regulations governing the Depositary
unless the Company requests that such papers be retained for a longer period or
turned over to the Company or to a successor depositary.

         SECTION 5.11. Exclusivity.

                  The Company agrees not to appoint any other depositary for
issuance of American Depositary Receipts evidencing American Depositary Shares
representing Shares as defined herein so long as The Bank of New York is acting
as Depositary hereunder.

                                      -22-
<PAGE>   26
         SECTION 5.12. List of Restricted Securities Owners.

                  Upon the reasonable request of the Depositary (but not more
often than once every six months), the Company shall provide to the Depositary a
list setting forth, to the actual knowledge of the Company, those persons or
entities who beneficially own Restricted Securities. The Company agrees to
advise in writing each of the persons or entities so listed that such Restricted
Securities are ineligible for deposit hereunder. The Depositary may rely on such
a list or update and shall not be liable for any action or omission made in
reliance thereon in good faith and without negligence.

ARTICLE 6. AMENDMENT AND TERMINATION.

         SECTION 6.01. Amendment.

                  The form of the Receipts and any provisions of this Deposit
Agreement may at any time and from time to time be amended by agreement between
the Company and the Depositary in any respect which they may deem necessary or
desirable. Any amendment which shall impose or increase any fees or charges
(other than taxes and other governmental charges, registration fees, cable,
telex or facsimile transmission costs, delivery costs or other such expenses),
or which shall otherwise prejudice any substantial existing right of Owners,
shall, however, not become effective as to outstanding Receipts until the
expiration of 30 days after notice of such amendment shall have been given to
the Owners of outstanding Receipts. Every Owner at the time any amendment so
becomes effective shall be deemed, by continuing to hold such Receipt, to
consent and agree to such amendment and to be bound by the Deposit Agreement as
amended thereby. In no event shall any amendment impair the right of the Owner
of any Receipt to surrender such Receipt and receive therefor the Deposited
Securities represented thereby, except in order to comply with mandatory
provisions of applicable law.

         SECTION 6.02. Termination.

                  The Depositary shall at any time at the direction of the
Company, terminate this Deposit Agreement by mailing notice of such termination
to the Owners of all Receipts then outstanding at least 30 days prior to the
date fixed in such notice for such termination. The Depositary may likewise
terminate this Deposit Agreement by mailing notice of such termination to the
Company and the Owners of all Receipts then outstanding if at any time 30 days
shall have expired after the Depositary shall have delivered to the Company a
written notice of its election to resign and a successor depositary shall not
have been appointed and accepted its appointment as provided in Section 5.04. On
and after the date of termination, the Owner of a Receipt will, upon (a)
surrender of such Receipt at the Corporate Trust Office of the Depositary, (b)
payment of the fee of the Depositary for the surrender of Receipts referred to
in Section 2.05, and (c) payment of any applicable taxes or governmental
charges, be entitled to delivery, to him or upon his order, of the amount of
Deposited Securities represented by the American Depositary Shares evidenced by
such Receipt. If any Receipts shall remain outstanding

                                      -23-
<PAGE>   27
after the date of termination, the Depositary thereafter shall discontinue the
registration of transfers of Receipts, shall suspend the distribution of
dividends to the Owners thereof, and shall not give any further notices or
perform any further acts under this Deposit Agreement, except that the
Depositary shall continue to collect dividends and other distributions
pertaining to Deposited Securities, shall sell rights as provided in this
Deposit Agreement, and shall continue to deliver Deposited Securities, together
with any dividends or other distributions received with respect thereto and the
net proceeds of the sale of any rights or other property, in exchange for
Receipts surrendered to the Depositary (after deducting, in each case, the fee
of the Depositary for the surrender of a Receipt, any expenses for the account
of the Owner of such Receipt in accordance with the terms and conditions of this
Deposit Agreement, and any applicable taxes or governmental charges). At any
time after the expiration of 30 days from the date of termination, the
Depositary may sell the Deposited Securities then held hereunder and may
thereafter hold uninvested the net proceeds of any such sale, together with any
other cash then held by it hereunder, unsegregated and without liability for
interest, for the pro rata benefit of the Owners of Receipts which have not
theretofore been surrendered, such Owners thereupon becoming general creditors
of the Depositary with respect to such net proceeds. After making such sale, the
Depositary shall be discharged from all obligations under this Deposit
Agreement, except to account for such net proceeds and other cash (after
deducting, in each case, the fee of the Depositary for the surrender of a
Receipt, any expenses for the account of the Owner of such Receipt in accordance
with the terms and conditions of this Deposit Agreement, and any applicable
taxes or governmental charges). Upon the termination of this Deposit Agreement,
the Company shall be discharged from all obligations under this Deposit
Agreement except for its obligations to the Depositary under Sections 5.08 and
5.09 hereof.

ARTICLE 7. MISCELLANEOUS.

         SECTION 7.01. Counterparts.

                  This Deposit Agreement may be executed in any number of
counterparts, each of which shall be deemed an original and all of such
counterparts shall constitute one and the same instrument. Copies of this
Deposit Agreement shall be filed with the Depositary and the Custodians and
shall be open to inspection by any holder or Owner of a Receipt during business
hours.

         SECTION 7.02. No Third Party Beneficiaries.

                  This Deposit Agreement is for the exclusive benefit of the
parties hereto and shall not be deemed to give any legal or equitable right,
remedy or claim whatsoever to any other person.

                                      -24-

<PAGE>   28
         SECTION 7.03. Severability.

                  In case any one or more of the provisions contained in this
Deposit Agreement or in the Receipts should be or become invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions contained herein or therein shall in no way be affected,
prejudiced or disturbed thereby.

         SECTION 7.04. Holders and Owners as Parties; Binding Effect.

                  The holders and Owners of Receipts from time to time shall be
parties to this Deposit Agreement and shall be bound by all of the terms and
conditions hereof and of the Receipts by acceptance thereof.

         SECTION 7.05. Notices.

                  Any and all notices to be given to the Company shall be deemed
to have been duly given if personally delivered or sent by mail or cable, telex
or facsimile transmission confirmed by letter, addressed to Lic. Flavio Miron,
Grupo Iusacell, S.A. de C.V., Montes Urales No. 460 - 3rd Floor, Col. Lomas de
Chapultepec, Del. Miguel Hidalgo, 11000, Mexico, D.F., or any other place to
which the Company may have transferred its principal office.

                  Any and all notices to be given to the Depositary shall be
deemed to have been duly given if in English and personally delivered or sent by
mail or cable, telex or facsimile transmission confirmed by letter, addressed to
The Bank of New York, 101 Barclay Street, New York, New York 10286, Attention:
American Depositary Receipt Administration, or any other place to which the
Depositary may have transferred its Corporate Trust Office.

                  Any and all notices to be given to any Owner shall be deemed
to have been duly given if personally delivered or sent by mail or cable, telex
or facsimile transmission confirmed by letter, addressed to such Owner at the
address of such Owner as it appears on the transfer books for Receipts of the
Depositary, or, if such Owner shall have filed with the Depositary a written
request that notices intended for such Owner be mailed to some other address, at
the address designated in such request.

                  Delivery of a notice sent by mail or cable, telex or facsimile
transmission shall be deemed to be effected at the time when a duly addressed
letter containing the same (or a confirmation thereof in the case of a cable,
telex or facsimile transmission) is deposited, postage prepaid, in a post-office
letter box. The Depositary or the Company may, however, act upon any cable,
telex or facsimile transmission received by it, notwithstanding that such cable,
telex or facsimile transmission shall not subsequently be confirmed by letter as
aforesaid.

                                     - 25 -
<PAGE>   29
         SECTION 7.06. Governing Law.

                  This Deposit Agreement and the Receipts shall be interpreted
and all rights hereunder and thereunder and provisions hereof and thereof shall
be governed by the laws of the State of New York.

                                     - 26 -
<PAGE>   30
                  IN WITNESS WHEREOF, GRUPO IUSACELL, S.A. de C.V. and THE BANK
OF NEW YORK have duly executed this agreement as of the day and year first set
forth above and all Owners shall become parties hereto upon acceptance by them
of Receipts issued in accordance with the terms hereof.

                                                 GRUPO IUSACELL, S.A. de C.V

                                                 By:_______________________
                                                    Name:
                                                    Title:

                                                 THE BANK OF NEW YORK,
                                                 as Depositary

                                                 By:_______________________
                                                    Name:
                                                    Title:

                                     - 27 -
<PAGE>   31
                                    EXHIBIT A

                                      AMERICAN DEPOSITARY SHARES
                                      (Each American Depositary Share represents
                                      ten deposited Shares)

OWNERS OF SERIES L SHARES OF CAPITAL STOCK, WITHOUT EXPRESSION OF PAR VALUE, ARE
SUBJECT TO LIMITED VOTING RIGHTS. SEE ARTICLE 16 HEREIN.

                              THE BANK OF NEW YORK
                           AMERICAN DEPOSITARY RECEIPT
        FOR SERIES L SHARES OF CAPITAL STOCK, WITH LIMITED VOTING RIGHTS,
                        WITHOUT EXPRESSION OF PAR VALUE,
                                       OF
                          GRUPO IUSACELL, S.A. de C.V.
           (INCORPORATED UNDER THE LAWS OF THE UNITED MEXICAN STATES)

         The Bank of New York as depositary (hereinafter called the
"Depositary"), hereby certifies that
____________________________________________________________, or registered
assigns IS THE OWNER OF ________________________

                           AMERICAN DEPOSITARY SHARES

representing deposited Series L shares of capital stock, with limited voting
rights, without expression of par value, (herein called "Shares") of Grupo
Iusacell, S.A. de C.V., incorporated under the laws of the United Mexican States
(herein called the "Company"). At the date hereof, each American Depositary
Share represents ten Shares deposited or subject to deposit under the Deposit
Agreement (as such term is hereinafter defined) at the Mexico City, Mexico,
office of Nacional Financiera, S.N.C. (herein called the "Custodian"). The
Depositary's Corporate Trust Office is located at a different address than its
principal executive office. Its Corporate Trust Office is located at 101 Barclay
Street, New York, N.Y. 10286, and its principal executive office is located at
48 Wall Street, New York, N.Y. 10286.

               THE DEPOSITARY'S CORPORATE TRUST OFFICE ADDRESS IS
                    101 BARCLAY STREET, NEW YORK, N.Y. 10286

                                     - 28 -
<PAGE>   32
ARTICLE 8. THE DEPOSIT AGREEMENT.

         This American Depositary Receipt is one of an issue (herein called
"Receipts"), all issued and to be issued upon the terms and conditions set forth
in the deposit agreement, dated as of June 14, 1994 (herein called the "Deposit
Agreement"), by and among the Company, the Depositary, and all Owners and
holders from time to time of Receipts issued thereunder, each of whom by
accepting a Receipt agrees to become a party thereto and become bound by all the
terms and conditions thereof. The Deposit Agreement sets forth the rights of
Owners and holders of the Receipts and the rights and duties of the Depositary
in respect of the Shares deposited thereunder and any and all other securities,
property and cash from time to time received in respect of such Shares and held
thereunder (such Shares, securities, property, and cash are herein called
"Deposited Securities"). Copies of the Deposit Agreement are on file at the
Depositary's Corporate Trust Office in New York City and at the office of the
Custodian.

         The statements made on the face and reverse of this Receipt are
summaries of certain provisions of the Deposit Agreement and are qualified by
and subject to the detailed provisions of the Deposit Agreement, to which
reference is hereby made. Capitalized terms defined in the Deposit Agreement and
not defined herein shall have the meanings set forth in the Deposit Agreement.

ARTICLE 9. SURRENDER OF RECEIPTS AND WITHDRAWAL OF SHARES.

         Upon surrender at the Corporate Trust Office of the Depositary of this
Receipt, and upon payment of the fee of the Depositary provided in this Receipt,
and subject to the terms and conditions of the Deposit Agreement, the Owner
hereof is entitled to (i) physical delivery, to him or upon his order, or (ii)
electronic transfer through Indeval, to an account in the name of the Owner or
such other name as the Owner may direct, of the amount of Deposited Securities
at the time represented by the American Depositary Shares for which this Receipt
is issued. Such delivery will be made at the option of the Owner hereof, either
at the office of the Custodian or at the Corporate Trust Office of the
Depositary, provided that the forwarding of certificates for Shares or other
Deposited Securities for such delivery at the Corporate Trust Office of the
Depositary shall be at the risk and expense of the Owner hereof.

ARTICLE 10. TRANSFERS, SPLIT-UPS, AND COMBINATIONS OF RECEIPTS.

         The transfer of this Receipt is registrable on the books of the
Depositary at its Corporate Trust Office by the Owner hereof in person or by a
duly authorized attorney, upon surrender of this Receipt properly endorsed for
transfer or accompanied by proper instruments of transfer and funds sufficient
to pay any applicable transfer taxes and the expenses of the Depositary and upon
compliance with such regulations, if any, as the Depositary may establish for
such purpose. This Receipt may be split into other such Receipts, or may be
combined with other such Receipts into one Receipt, evidencing the same
aggregate number of American Depositary Shares as the Receipt or Receipts

                                     - 29 -
<PAGE>   33
surrendered. As a condition precedent to the execution and delivery,
registration of transfer, split-up, combination, or surrender of any Receipt or
withdrawal of any Deposited Securities, the Depositary, the Custodian, or
Registrar may require payment from the depositor of the Shares or the presentor
of the Receipt of a sum sufficient to reimburse it for any tax or other
governmental charge and any stock transfer or registration fee with respect
thereto (including any such tax or charge and fee with respect to Shares being
deposited or withdrawn) and payment of any applicable fees as provided in this
Receipt, may require the production of proof satisfactory to it as to the
identity and genuineness of any signature and may also require compliance with
any regulations the Depositary may establish consistent with the provisions of
the Deposit Agreement or this Receipt, including, without limitation, this
Article 3.

         The delivery of Receipts against deposits of Shares generally or
against deposits of particular Shares may be suspended, or the transfer of
Receipts in particular instances may be refused, or the registration of transfer
of outstanding Receipts generally may be suspended, during any period when the
transfer books of the Depositary are closed, or if any such action is deemed
necessary or advisable by the Depositary or the Company at any time or from time
to time because of any requirement of law or of any government or governmental
body or commission, or under any provision of the Deposit Agreement or this
Receipt, or for any other reason, subject to the provisions of the following
sentence. The surrender of outstanding Receipts and withdrawal of Deposited
Securities may not be suspended subject only to (i) temporary delays caused by
closing the transfer books of the Depositary or the Company or the deposit of
Shares in connection with voting at a shareholders' meeting, or the payment of
dividends, (ii) the payment of fees, taxes and similar charges, and (iii)
compliance with any U.S. or foreign laws or governmental regulations relating to
the Receipts or to the withdrawal of the Deposited Securities. Without
limitation of the foregoing, the Depositary shall not knowingly accept for
deposit under the Deposit Agreement any Shares required to be registered under
the provisions of the Securities Act of 1933, unless a registration statement is
in effect as to such Shares.

ARTICLE 11. LIABILITY OF OWNER FOR TAXES.

         If any tax or other governmental charge shall become payable with
respect to any Receipt or any Deposited Securities represented hereby, such tax
or other governmental charge shall be payable by the Owner hereof to the
Depositary. The Depositary may refuse to effect any transfer of this Receipt or
any withdrawal of Deposited Securities represented by American Depositary Shares
evidenced by such Receipt until such payment is made, and may withhold any
dividends or other distributions, or may sell for the account of the Owner
hereof any part or all of the Deposited Securities represented by the American
Depositary Shares evidenced by this Receipt, and may apply such dividends or
other distributions or the proceeds of any such sale in payment of such tax or
other governmental charge and the Owner hereof shall remain liable for any
deficiency.

                                     - 30 -
<PAGE>   34
ARTICLE 12. WARRANTIES OF DEPOSITORS.

         Every person depositing Shares hereunder and under the Deposit
Agreement shall be deemed thereby to represent and warrant that such Shares and
each certificate therefor are validly issued, fully paid, non-assessable, and
free of any pre-emptive rights of the holders of outstanding Shares and that the
person making such deposit is duly authorized so to do. Every such person shall
also be deemed to represent that the deposit of such Shares and the sale of
Receipts evidencing American Depositary Shares representing such Shares by that
person are not restricted under the Securities Act of 1933. Such representations
and warranties shall survive the deposit of Shares and issuance of Receipts.

ARTICLE 13. FILING PROOFS, CERTIFICATES, AND OTHER INFORMATION

         Any person presenting Shares for deposit or any Owner of a Receipt may
be required from time to time to file with the Depositary or the Custodian such
proof of citizenship or residence, exchange control approval, or such
information relating to the registration on the books of the Company or the
Foreign Registrar, if applicable, to execute such certificates and to make such
representations and warranties, as the Depositary may deem necessary or proper.
The Depositary may withhold the delivery or registration of transfer of any
Receipt or the distribution of any dividend or sale or distribution of rights or
of the proceeds thereof or the delivery of any Deposited Securities until such
proof or other information is filed or such certificates are executed or such
representations and warranties made. No Share shall be accepted for deposit
unless accompanied by evidence satisfactory to the Depositary that any necessary
approval has been granted by any governmental body in the United Mexican States
which is then performing the function of the regulation of currency exchange.

ARTICLE 14. CHARGES OF DEPOSITARY.

         The Company agrees to pay the fees, reasonable expenses and
out-of-pocket charges of the Depositary and those of any Registrar only in
accordance with agreements in writing entered into between the Depositary and
the Company from time to time. The Depositary shall present its statement for
such charges and expenses to the Company once every three months. The charges
and expenses of the Custodian are for the sole account of the Depositary.

         The following charges shall be incurred by any party depositing or
withdrawing Shares or by any party surrendering Receipts or to whom Receipts are
issued (including, without limitation, issuance pursuant to a stock dividend or
stock split declared by the Company or an exchange of stock regarding the
Receipts or Deposited Securities or a distribution of Receipts pursuant to
Section 4.03 of the Deposit Agreement), whichever applicable: (1) taxes and
other governmental charges, (2) such registration fees as may from time to time
be in effect for the registration of transfers of Shares generally on the Share
register of the Company, Foreign Registrar or Indeval and applicable to
transfers of

                                     - 31 -
<PAGE>   35
Shares to the name of the Depositary or its nominee or the Custodian or its
nominee on the making of deposits or withdrawals under the terms of the Deposit
Agreement, (3) such cable, telex and facsimile transmission expenses as are
expressly provided in the Deposit Agreement, (4) such expenses as are incurred
by the Depositary in the conversion of foreign currency pursuant to Section 4.05
of the Deposit Agreement, (5) a fee not in excess of $5.00 per 100 American
Depositary Shares (or portion thereof) for the execution and delivery of
Receipts pursuant to Sections 2.03 or 4.03 of the Deposit Agreement and the
surrender of Receipts pursuant to Section 2.05 of the Deposit Agreement and (6)
a fee not in excess of $2.00 per 100 American Depositary Shares (or portion
thereof) for, and deduct such fee from, the distribution of proceeds of sales of
securities or rights pursuant to Sections 4.02 or 4.04, respectively.

         The Depositary, subject to Article 8 hereof, may own and deal in any
class of securities of the Company and its affiliates and in Receipts.

ARTICLE 15. PRE-RELEASE OF RECEIPTS.

         Notwithstanding Section 2.03 of the Deposit Agreement, the Depositary
may execute and deliver Receipts prior to the receipt of Shares pursuant to
Section 2.02 of the Deposit Agreement ("Pre-Release"). The Depositary may,
pursuant to Section 2.05 of the Deposit Agreement, deliver Shares upon the
receipt and cancellation of Receipts which have been Pre-Released, whether or
not such cancellation is prior to the termination of such Pre-Release or the
Depositary knows that such Receipt has been Pre-Released. The Depositary may
receive Receipts in lieu of Shares in satisfaction of a Pre-Release. Each
Pre-Release will be (a) preceded or accompanied by a written representation from
the person to whom Receipts are to be delivered that such person, or its
customer, owns the Shares or Receipts to be remitted, as the case may be, (b) at
all times fully collateralized with cash or such other collateral as the
Depositary deems appropriate, (c) terminable by the Depositary on not more than
five (5) business days notice, and (d) subject to such further indemnities and
credit regulations as the Depositary deems appropriate. The number of American
Depositary Shares which are outstanding at any time as a result of Pre-Releases
will not normally exceed thirty percent (30%) of the Shares deposited under the
Deposit Agreement; provided, however, that the Depositary reserves the right to
change or disregard such limit from time to time as it deems appropriate.

         The Depositary may retain for its own account any compensation received
by it in connection with the foregoing.

ARTICLE 16. TITLE TO RECEIPTS.

         It is a condition of this Receipt and every successive holder and Owner
of this Receipt by accepting or holding the same consents and agrees, that title
to this Receipt when properly endorsed or accompanied by proper instruments of
transfer, is transferable by delivery with the same effect as in the case of a
negotiable instrument, provided,

                                     - 32 -
<PAGE>   36
however, that the Depositary, notwithstanding any notice to the contrary, may
treat the person in whose name this Receipt is registered on the books of the
Depositary as the absolute owner hereof for the purpose of determining the
person entitled to distribution of dividends or other distributions or to any
notice provided for in the Deposit Agreement or for all other purposes.

ARTICLE 17. VALIDITY OF RECEIPT.

         This Receipt shall not be entitled to any benefits under the Deposit
Agreement or be valid or obligatory for any purpose, unless this Receipt shall
have been executed by the Depositary by the manual or facsimile signature of a
duly authorized signatory of the Depositary.

ARTICLE 18. REPORTS; INSPECTION OF TRANSFER BOOKS.

         The Company is subject to the reporting requirements of the Securities
Exchange Act of 1934 and accordingly files certain reports with the Securities
and Exchange Commission (the "Commission"). Such reports and communications will
be available for inspection and copying by holders and Owners at the public
reference facilities maintained by the Commission located at 450 Fifth Street,
N.W., Washington, D.C. 20549.

         The Depositary will make available for inspection by Owners of Receipts
at its Corporate Trust Office any reports and communications, including any
proxy soliciting material, received from the Company which are both (a) received
by the Depositary as the holder of the Deposited Securities and (b) made
generally available to the holders of such Deposited Securities by the Company.
The Depositary will also send to Owners of Receipts copies of such reports when
furnished by the Company pursuant to the Deposit Agreement. Any such reports and
communications, including any such proxy soliciting material, furnished to the
Depositary by the Company shall be furnished in English to the extent such
materials are required to be translated into English pursuant to any regulations
of the Commission.

         The Depositary will keep books for the registration of Receipts and
transfers of Receipts which at all reasonable times shall be open for inspection
by the Owners of Receipts provided that such inspection shall not be for the
purpose of communicating with Owners of Receipts in the interest of a business
or object other than the business of the Company or a matter related to the
Deposit Agreement or the Receipts.

ARTICLE 19. DIVIDENDS AND DISTRIBUTIONS.

         Whenever the Depositary receives any cash dividend or other cash
distribution on any Deposited Securities, the Depositary will, if at the time of
receipt thereof any amounts received in a foreign currency can in the judgment
of the Depositary be converted on a reasonable basis into United States dollars
transferable to the United

                                     - 33 -
<PAGE>   37
States, and subject to the Deposit Agreement, convert such dividend or
distribution into dollars and will distribute the amount thus received (net of
the expenses of the Depositary as provided in Article 7 hereof and Section 5.09
of the Deposit Agreement) to the Owners of Receipts entitled thereto, provided,
however, that in the event that the Company or the Depositary is required to
withhold and does withhold from any cash dividend or other cash distribution in
respect of any Deposited Securities an amount on account of taxes, the amount
distributed to the Owners of the Receipts evidencing American Depositary Shares
representing such Deposited Securities shall be reduced accordingly.

         Subject to the provisions of Section 4.11 and 5.09 of the Deposit
Agreement, whenever the Depositary receives any distribution other than a
distribution described in Sections 4.01, 4.03 or 4.04 of the Deposit Agreement,
the Depositary will cause the securities or property received by it to be
distributed to the Owners of Receipts entitled thereto, in any manner that the
Depositary may deem equitable and practicable for accomplishing such
distribution; provided, however, that if in the opinion of the Depositary such
distribution cannot be made proportionately among the Owners of Receipts
entitled thereto, or if for any other reason the Depositary deems such
distribution not to be feasible, the Depositary may adopt such method as it may
deem equitable and practicable for the purpose of effecting such distribution,
including, but not limited to, the public or private sale of the securities or
property thus received, or any part thereof, and the net proceeds of any such
sale (net of the fees of the Depositary as provided in Article 7 hereof and
Section 5.09 of the Deposit Agreement) shall be distributed by the Depositary to
the Owners of Receipts entitled thereto as in the case of a distribution
received in cash.

         If any distribution consists of a dividend in, or free distribution of,
Shares, the Depositary may and shall if the Company shall so request, distribute
to the Owners of outstanding Receipts entitled thereto, additional Receipts
evidencing an aggregate number of American Depositary Shares representing the
amount of Shares received as such dividend or free distribution subject to the
terms and conditions of the Deposit Agreement with respect to the deposit of
Shares and the issuance of American Depositary Shares evidenced by Receipts,
including the withholding of any tax or other governmental charge as provided in
Section 4.11 of the Deposit Agreement and the payment of the fees of the
Depositary as provided in Article 7 hereof and Section 5.09 of the Deposit
Agreement. In lieu of delivering Receipts for fractional American Depositary
Shares in any such case, the Depositary will sell the amount of Shares
represented by the aggregate of such fractions and distribute the net proceeds,
all in the manner and subject to the conditions set forth in the Deposit
Agreement. If additional Receipts are not so distributed, each American
Depositary Share shall thenceforth also represent the additional Shares
distributed upon the Deposited Securities represented thereby.

         In the event that the Depositary determines that any distribution in
property (including Shares and rights to subscribe therefor) is subject to any
tax or other

                                     - 34 -
<PAGE>   38
governmental charge which the Depositary is obligated to withhold, the
Depositary may by public or private sale dispose of all or a portion of such
property (including Shares and rights to subscribe therefor) in such amounts and
in such manner as the Depositary deems necessary and practicable to pay any such
taxes or charges, and the Depositary shall distribute the net proceeds of any
such sale after deduction of such taxes or charges to the Owners of Receipts
entitled thereto.

ARTICLE 20. RIGHTS.

         In the event that the Company shall offer or cause to be offered to the
holders of any Deposited Securities any rights to subscribe for additional
Shares or any rights of any other nature, the Depositary shall have discretion
as to the procedure to be followed in making such rights available to any Owners
or in disposing of such rights on behalf of any Owners and making the net
proceeds available to such Owners or, if by the terms of such rights offering or
for any other reason, the Depositary may not either make such rights available
to any Owners or dispose of such rights and make the net proceeds available to
such Owners, then the Depositary shall allow the rights to lapse. If at the time
of the offering of any rights the Depositary determines in its discretion that
it is lawful and feasible to make such rights available to all or certain Owners
but not to other Owners, the Depositary may distribute to any Owner to whom it
determines the distribution to be lawful and feasible, in proportion to the
number of American Depositary Shares held by such Owner, warrants or other
instruments therefor in such form as it deems appropriate.

         In circumstances in which rights would otherwise not be distributed, if
an Owner of Receipts requests the distribution of warrants or other instruments
in order to exercise the rights allocable to the American Depositary Shares of
such Owner hereunder, the Depositary will make such rights available to such
Owner upon written notice from the Company to the Depositary that (a) the
Company has elected in its sole discretion to permit such rights to be exercised
and (b) such Owner has executed such documents as the Company has determined in
its sole discretion are reasonably required under applicable law and the opinion
referred to below.

         Subject to applicable law and as agreed to by the Company and the
Depositary in each instance, the Depositary shall also assist the Company in
making private placements or other limited offerings of rights and the
securities offered thereby upon the request of the Company.

         If the Depositary has distributed warrants or other instruments for
rights to all or certain Owners, then upon instruction from such an Owner
pursuant to such warrants or other instruments to the Depositary from such Owner
to exercise such rights, upon payment by such Owner to the Depositary for the
account of such Owner of an amount equal to the purchase price of the Shares to
be received upon the exercise of the rights, and upon payment of the fees of the
Depositary and any other charges as set forth in such warrants or other
instruments, the Depositary shall, on behalf of such Owner, exercise the

                                     - 35 -
<PAGE>   39
rights and purchase the Shares, and the Company shall cause the Shares so
purchased to be delivered to the Depositary on behalf of such Owner. As agent
for such Owner, the Depositary will cause the Shares so purchased to be
deposited pursuant to Section 2.02 of the Deposit Agreement, and shall, pursuant
to Section 2.03 of the Deposit Agreement, execute and deliver Receipts to such
Owner. In the case of a distribution pursuant to the second or third paragraph
of this Article 13, such Receipts shall be legended as reasonably requested by
the Company in accordance with applicable U.S. laws as appropriate, and shall be
subject to the appropriate restrictions on sale, deposit, cancellation, and
transfer under such laws.

         If the Depositary determines in its discretion that it is not lawful
and feasible to make such rights available to all or certain Owners, it may sell
the rights, warrants or other instruments in proportion to the number of
American Depositary Shares held by the Owners to whom it has determined it may
not lawfully or feasibly make such rights available, and allocate the net
proceeds of such sales (net of the fees of the Depositary as provided in Section
5.09 of the Deposit Agreement and all taxes and governmental charges payable in
connection with such rights and subject to the terms and conditions of the
Deposit Agreement) for the account of such Owners otherwise entitled to such
rights, warrants or other instruments, upon an averaged or other practical basis
without regard to any distinctions among such Owners because of exchange
restrictions or the date of delivery of any Receipt or otherwise.

         The Depositary will not offer rights to Owners unless both the rights
and the securities to which such rights relate are either exempt from
registration under the Securities Act of 1933 with respect to a distribution to
all Owners or are registered under the provisions of such Act. If an Owner of
Receipts requests the distribution of warrants or other instruments,
notwithstanding that there has been no such registration under such Act, the
Depositary shall not effect such distribution unless it has received an opinion
from recognized counsel in the United States for the Company upon which the
Depositary may rely that such distribution to such Owner is exempt from such
registration.

         The Depositary shall not be responsible to Owners for any failure to
determine that it may be lawful or feasible to make such rights available to
Owners in general or any Owner in particular.

ARTICLE 21. CONVERSION OF FOREIGN CURRENCY.

         Whenever the Depositary shall receive foreign currency, by way of
dividends or other distributions or the net proceeds from the sale of
securities, property or rights, and if at the time of the receipt thereof the
foreign currency so received can in the judgment of the Depositary be converted
on a reasonable basis into Dollars and the resulting Dollars transferred to the
United States, the Depositary shall convert or cause to be converted, by sale or
in any other manner that it may determine, such foreign currency into Dollars,
and such Dollars shall be distributed to the Owners entitled thereto or, if the

                                     - 36 -
<PAGE>   40
Depositary shall have distributed any warrants or other instruments which
entitle the holders thereof to such Dollars, then to the holders of such
warrants and/or instruments upon surrender thereof for cancellation. Such
distribution may be made upon an averaged or other practicable basis without
regard to any distinctions among Owners on account of exchange restrictions, the
date of delivery of any Receipt or otherwise and shall be net of any expenses of
conversion into Dollars incurred by the Depositary as provided in Section 5.09
of the Deposit Agreement.

         If such conversion or distribution can be effected only with the
approval or license of any government or agency thereof, the Depositary shall
file such application for approval or license, if any, as it may deem desirable.

         If at any time the Depositary shall determine that in its judgment any
foreign currency received by the Depositary is not convertible on a reasonable
basis into Dollars transferable to the United States, or if any approval or
license of any government or agency thereof which is required for such
conversion is denied or in the opinion of the Depositary is not obtainable, or
if any such approval or license is not obtained within a reasonable period as
determined by the Depositary, the Depositary may distribute the foreign currency
(or an appropriate document evidencing the right to receive such foreign
currency) received by the Depositary to, or in its discretion may hold such
foreign currency uninvested and without liability for interest thereon for the
respective accounts of, the Owners entitled to receive the same.

         If any such conversion of foreign currency, in whole or in part, cannot
be effected for distribution to some of the Owners entitled thereto, the
Depositary may in its discretion make such conversion and distribution in
Dollars to the extent permissible to the Owners entitled thereto and may
distribute the balance of the foreign currency received by the Depositary to, or
hold such balance uninvested and without liability for interest thereon for the
respective accounts of, the Owners entitled thereto.

ARTICLE 22. RECORD DATES.

         Whenever any cash dividend or other cash distribution shall become
payable or any distribution other than cash shall be made, or whenever rights
shall be issued with respect to the Deposited Securities, or whenever for any
reason the Depositary causes a change in the number of Shares that are
represented by each American Depositary Share, or whenever the Depositary shall
receive notice of any meeting of holders of Shares or other Deposited
Securities, the Depositary shall fix a record date (a) for the determination of
the Owners of Receipts who shall be (i) entitled to receive such dividend,
distribution or rights or the net proceeds of the sale thereof or (ii) entitled
to give instructions for the exercise of voting rights at any such meeting, or
(b) on or after which each American Depositary Share will represent the changed
number of Shares, subject to the provisions of the Deposit Agreement.

                                     - 37 -
<PAGE>   41
ARTICLE 23. VOTING OF DEPOSITED SECURITIES.

         Under the Company's By-laws (Estatutos Sociales), the Shares
represented by the American Depositary Shares evidenced by the Receipts may be
voted only in certain limited circumstances. Other than the right to elect one
director, Owners may be entitled to instruct the Depositary to vote the Shares
represented by the American Depositary Shares evidenced by their Receipts at any
extraordinary general Shareholders' meeting but only with respect to certain
changes in the legal structure of the Company, certain mergers or the
cancellation of the registration of the Shares on any Mexican or foreign stock
exchange. Except as described above, Owners have no voting rights.

         Upon receipt of notice of any meeting of holders of Shares or other
Deposited Securities, if requested in writing by the Company, the Depositary
shall, as soon as practicable thereafter, mail to the Owners of Receipts a
notice, the form of which notice shall be in the sole discretion of the
Depositary, which shall contain (a) such information as is contained in such
notice of meeting, (b) a statement that the Owners of Receipts as of the close
of business on a specified record date will be entitled, subject to any
applicable provision of law and of the Estatutos Sociales of the Company, to
instruct the Depositary as to the exercise of the voting rights, if any,
pertaining to the amount of Shares or other Deposited Securities represented by
their respective American Depositary Shares and (c) a statement as to the manner
in which such instructions may be given, (or deemed given in accordance with the
last sentence of Section 4.07 of the Deposit Agreement if no instruction is
received) to the Depositary. Upon the written request of an Owner of a Receipt
on such record date, received on or before the date established by the
Depositary for such purpose, the Depositary shall endeavor in so far as
practicable to vote or cause to be voted the amount of Shares or other Deposited
Securities represented by such American Depositary Shares evidenced by such
Receipt in accordance with the instructions set forth in such request. If, after
complying with the procedures set forth in Section 4.07 of the Deposit
Agreement, the Depositary does not receive instructions from the Owners of any
Receipts on or before the date established by the Depositary for such purpose,
the Depositary shall give a proxy for the Shares represented by the American
Depositary Shares evidenced by such Receipts to a person designated by the
Company to vote such Shares in regard to any matter in the same proportions as
all of the other Shares that are voted with regard to such matter.

ARTICLE 24. CHANGES AFFECTING DEPOSITED SECURITIES.

         In circumstances where the provisions of Section 4.03 of the Deposit
Agreement do not apply, upon any change in nominal value, change in par value,
split-up, consolidation, or any other reclassification of Deposited Securities,
or upon any recapitalization, reorganization, merger or consolidation, or sale
of assets affecting the Company or to which it is a party, any securities which
shall be received by the Depositary or a Custodian in exchange for or in
conversion of or in respect of Deposited Securities shall be treated as new
Deposited Securities under the Deposit Agreement, and

                                     - 38 -
<PAGE>   42
American Depositary Shares shall thenceforth represent the new Deposited
Securities so received in exchange or conversion, unless additional Receipts are
delivered pursuant to the following sentence. In any such case the Depositary
may, and shall if the Company shall so request, execute and deliver additional
Receipts as in the case of a dividend in Shares, or call for the surrender of
outstanding Receipts to be exchanged for new Receipts specifically describing
such new Deposited Securities.

ARTICLE 25. LIABILITY OF THE COMPANY AND DEPOSITARY.

         Neither the Depositary nor the Company shall incur any liability to any
Owner or holder of any Receipt, if by reason of any provision of any present or
future law or regulation of the United States or any other country, or of any
other governmental or regulatory authority, or by reason of any provision,
present or future, of the Estatutos Sociales of the Company, or by reason of any
act of God or war or other circumstances beyond its control, the Depositary or
the Company shall be prevented or forbidden from or be subject to any civil or
criminal penalty on account of doing or performing any act or thing which by the
terms of the Deposit Agreement it is provided shall be done or performed; nor
shall the Depositary or the Company incur any liability to any Owner or holder
of a Receipt by reason of any non-performance or delay, caused as aforesaid, in
the performance of any act or thing which by the terms of the Deposit Agreement
it is provided shall or may be done or performed, or by reason of any exercise
of, or failure to exercise, any discretion provided for in the Deposit
Agreement. Where, by the terms of a distribution pursuant to Sections 4.01,
4.02, or 4.03 of the Deposit Agreement, or an offering or distribution pursuant
to Section 4.04 of the Deposit Agreement, such distribution or offering may not
be made available to Owners of Receipts, and the Depositary may not dispose of
such distribution or offering on behalf of such Owners and make the net proceeds
available to such Owners, then the Depositary shall not make such distribution
or offering, and shall allow any rights, if applicable, to lapse. Neither the
Company nor the Depositary assumes any obligation or shall be subject to any
liability under the Deposit Agreement to Owners or holders of Receipts, except
that they agree to perform their obligations specifically set forth in the
Deposit Agreement without negligence or bad faith. The Depositary shall not be
subject to any liability with respect to the validity or worth of the Deposited
Securities. Neither the Depositary nor the Company shall be under any obligation
to appear in, prosecute or defend any action, suit, or other proceeding in
respect of any Deposited Securities or in respect of the Receipts, which in its
opinion may involve it in expense or liability, unless indemnity satisfactory to
it against all expense and liability shall be furnished as often as may be
required, and the Custodian shall not be under any obligation whatsoever with
respect to such proceedings, the responsibility of the Custodian being solely to
the Depositary. Neither the Depositary nor the Company shall be liable for any
action or nonaction by it in reliance upon the advice of or information from
legal counsel, accountants, any person presenting Shares for deposit, any Owner
or holder of a Receipt, or any other person believed by it in good faith to be
competent to give such advice or information. The Depositary shall not be
responsible for any failure to carry out any instructions to vote

                                     - 39 -
<PAGE>   43
any of the Deposited Securities, or for the manner in which any such vote is
cast or the effect of any such vote, provided that any such action or nonaction
is in good faith and without negligence. The Depositary shall not be liable for
any acts or omissions made by a successor depositary whether in connection with
a previous act or omission of the Depositary or in connection with a matter
arising wholly after the removal or resignation of the Depositary, provided that
in connection with the issue out of which such potential liability arises, the
Depositary performed its obligations without negligence or bad faith while it
acted as Depositary. The Company agrees to indemnify the Depositary, its
directors, employees, agents and affiliates and any Custodian against, and hold
each of them harmless from, any liability or expense (including, but not limited
to, the expenses of counsel) which may arise out of acts performed or omitted,
in accordance with the provisions of the Deposit Agreement and of the Receipts,
as the same may be amended, modified, or supplemented from time to time, (i) by
either the Depositary or a Custodian or their respective directors, employees,
agents and affiliates, except for any liability or expense arising out of the
negligence or bad faith of either of them, or (ii) by the Company or any of its
directors, employees, agents and affiliates. No disclaimer of liability under
the Securities Act of 1933 is intended by any provision of the Deposit
Agreement.

ARTICLE 26. RESIGNATION AND REMOVAL OF THE DEPOSITARY; APPOINTMENT OF SUCCESSOR
            CUSTODIAN.

         The Depositary may at any time resign as Depositary hereunder by
written notice of its election so to do delivered to the Company, such
resignation to take effect upon the appointment of a successor depositary and
its acceptance of such appointment as provided in the Deposit Agreement. The
Depositary may at any time be removed by the Company by written notice of such
removal, effective upon the appointment of a successor depositary and its
acceptance of such appointment as provided in the Deposit Agreement. Whenever
the Depositary in its discretion determines that it is in the best interest of
the Owners of Receipts to do so, it may appoint a substitute or additional
custodian or custodians.

ARTICLE 27. AMENDMENT.

         The form of the Receipts and any provisions of the Deposit Agreement
may at any time and from time to time be amended by agreement between the
Company and the Depositary in any respect which they may deem necessary or
desirable. Any amendment which shall impose or increase any fees or charges
(other than taxes and other governmental charges, registration fees and cable,
telex or facsimile transmission costs, delivery costs or other such expenses),
or which shall otherwise prejudice any substantial existing right of Owners of
Receipts, shall, however, not become effective as to outstanding Receipts until
the expiration of thirty days after notice of such amendment shall have been
given to the Owners of outstanding Receipts. Every Owner of a Receipt at the
time any amendment so becomes effective shall be deemed, by continuing to hold

                                     - 40 -
<PAGE>   44
such Receipt, to consent and agree to such amendment and to be bound by the
Deposit Agreement as amended thereby. In no event shall any amendment impair the
right of the Owner of any Receipt to surrender such Receipt and receive therefor
the Deposited Securities represented thereby except in order to comply with
mandatory provisions of applicable law.

ARTICLE 28. TERMINATION OF DEPOSIT AGREEMENT.

         The Depositary at any time at the direction of the Company, shall
terminate the Deposit Agreement by mailing notice of such termination to the
Owners of all Receipts then outstanding at least 90 days prior to the date fixed
in such notice for such termination. The Depositary may likewise terminate the
Deposit Agreement by mailing notice of such termination to the Company and the
Owners of all Receipts then outstanding if at any time 90 days shall have
expired after the Depositary shall have delivered to the Company a written
notice of its election to resign and a successor depositary shall not have been
appointed and accepted its appointment as provided in the Deposit Agreement. On
and after the date of termination, the Owner of a Receipt will, upon (a)
surrender of such Receipt at the Corporate Trust Office of the Depositary, (b)
payment of the fee of the Depositary for the surrender of Receipts referred to
in Section 2.05 of the Deposit Agreement, and (c) payment of any applicable
taxes or governmental charges, be entitled to delivery, to him or upon his
order, of the amount of Deposited Securities represented by the American
Depositary Shares evidenced by such Receipt. If any Receipts shall remain
outstanding after the date of termination, the Depositary thereafter shall
discontinue the registration of transfers of Receipts, shall suspend the
distribution of dividends to the Owners thereof, and shall not give any further
notices or perform any further acts under the Deposit Agreement, except that the
Depositary shall continue to collect dividends and other distributions
pertaining to Deposited Securities, shall sell rights as provided in the Deposit
Agreement, and shall continue to deliver Deposited Securities, together with any
dividends or other distributions received with respect thereto and the net
proceeds of the sale of any rights or other property, in exchange for Receipts
surrendered to the Depositary (after deducting, in each case, the fee of the
Depositary for the surrender of a Receipt, any expenses for the account of the
Owner of such Receipt in accordance with the terms and conditions of the Deposit
Agreement, and any applicable taxes or governmental charges). At any time after
the expiration of one year from the date of termination, the Depositary may sell
the Deposited Securities then held under the Deposit Agreement and may
thereafter hold uninvested the net proceeds of any such sale, together with any
other cash then held by it thereunder, unsegregated and without liability for
interest, for the pro rata benefit of the Owners of Receipts which have not
theretofore been surrendered, such Owners thereupon becoming general creditors
of the Depositary with respect to such net proceeds. After making such sale, the
Depositary shall be discharged from all obligations under the Deposit Agreement,
except to account for such net proceeds and other cash (after deducting, in each
case, the fee of the Depositary for the surrender of a Receipt, any expenses for
the account of the Owner of such Receipt in accordance with the terms and

                                     - 41 -
<PAGE>   45
conditions of the Deposit Agreement, and any
applicable taxes or governmental charges). Upon the termination of the Deposit
Agreement, the Company shall be discharged from all obligations under the
Deposit Agreement except for its obligations to the Depositary with respect to
indemnification, charges, and expenses.

                                     - 42 -
<PAGE>   46
                    (ASSIGNMENT AND TRANSFER SIGNATURE LINES)

NOTE:             The signature to any endorsement hereon must correspond with
                  the name as written upon the face of this Receipt in every
                  particular, without alteration or enlargement or any change
                  whatever.

                  If the endorsement be executed by an attorney, executor,
                  administrator, trustee or guardian, the person executing the
                  endorsement must give his full title in such capacity and
                  proper evidence of authority to act in such capacity, if not
                  on file with the Depositary, must be forwarded with this
                  Receipt.

                  All endorsements or assignments of Receipts must be guaranteed
                  by an "eligible guarantor institution" (including, but not
                  limited to, a New York Stock Exchange member firm or member of
                  the Clearing House of the American Stock Exchange Clearing
                  Corporation or by a bank or trust company having an office or
                  correspondent in The City of New York) meeting the
                  requirements of the Depositary, which requirements will
                  include membership or participation in STAMP or such other
                  "signature guarantee program" as may be determined by the
                  Depositary in addition to, or in substitution for, STAMP, all
                  in accordance with the Securities Exchange Act of 1934, as
                  amended.

                                     - 43 -
<PAGE>   47
                                    EXHIBIT A

                                      AMERICAN DEPOSITARY SHARES
                                      (Each American Depositary Share represents
                                      ten deposited Shares)

                              THE BANK OF NEW YORK
                           AMERICAN DEPOSITARY RECEIPT
                       FOR SERIES D SHARES OF COMMON STOCK
                        WITHOUT EXPRESSION OF PAR VALUE,
                                       OF
                          GRUPO IUSACELL, S.A. de C.V.
           (INCORPORATED UNDER THE LAWS OF THE UNITED MEXICAN STATES)

         The Bank of New York as depositary (hereinafter called the
"Depositary"), hereby certifies that
___________________________________________________________, or registered
assigns IS THE OWNER OF ________________________

                           AMERICAN DEPOSITARY SHARES

representing deposited Series D shares of common stock, without expression of
par value, (herein called "Shares") of Grupo Iusacell, S.A. de C.V.,
incorporated under the laws of the United Mexican States (herein called the
"Company"). At the date hereof, each American Depositary Share represents ten
Shares deposited or subject to deposit under the Deposit Agreement (as such term
is hereinafter defined) at the Mexico City, Mexico, office of Nacional
Financiera, S.N.C. (herein called the "Custodian"). The Depositary's Corporate
Trust Office is located at a different address than its principal executive
office. Its Corporate Trust Office is located at 101 Barclay Street, New York,
N.Y. 10286, and its principal executive office is located at 48 Wall Street, New
York, N.Y. 10286.

               THE DEPOSITARY'S CORPORATE TRUST OFFICE ADDRESS IS
                    101 BARCLAY STREET, NEW YORK, N.Y. 10286

                                     - 44 -
<PAGE>   48
ARTICLE 29. THE DEPOSIT AGREEMENT.

         This American Depositary Receipt is one of an issue (herein called
"Receipts"), all issued and to be issued upon the terms and conditions set forth
in the deposit agreement, dated as of June 14, 1994 (herein called the "Deposit
Agreement"), by and among the Company, the Depositary, and all Owners and
holders from time to time of Receipts issued thereunder, each of whom by
accepting a Receipt agrees to become a party thereto and become bound by all the
terms and conditions thereof. The Deposit Agreement sets forth the rights of
Owners and holders of the Receipts and the rights and duties of the Depositary
in respect of the Shares deposited thereunder and any and all other securities,
property and cash from time to time received in respect of such Shares and held
thereunder (such Shares, securities, property, and cash are herein called
"Deposited Securities"). Copies of the Deposit Agreement are on file at the
Depositary's Corporate Trust Office in New York City and at the office of the
Custodian.

         The statements made on the face and reverse of this Receipt are
summaries of certain provisions of the Deposit Agreement and are qualified by
and subject to the detailed provisions of the Deposit Agreement, to which
reference is hereby made. Capitalized terms defined in the Deposit Agreement and
not defined herein shall have the meanings set forth in the Deposit Agreement.

ARTICLE 30. SURRENDER OF RECEIPTS AND WITHDRAWAL OF SHARES.

         Upon surrender at the Corporate Trust Office of the Depositary of this
Receipt, and upon payment of the fee of the Depositary provided in this Receipt,
and subject to the terms and conditions of the Deposit Agreement, the Owner
hereof is entitled to (i) physical delivery, to him or upon his order, or (ii)
electronic transfer through Indeval, to an account in the name of the Owner or
such other name as the Owner may direct, of the amount of Deposited Securities
at the time represented by the American Depositary Shares for which this Receipt
is issued. Such delivery will be made at the option of the Owner hereof, either
at the office of the Custodian or at the Corporate Trust Office of the
Depositary, provided that the forwarding of certificates for Shares or other
Deposited Securities for such delivery at the Corporate Trust Office of the
Depositary shall be at the risk and expense of the Owner hereof.

ARTICLE 31. TRANSFERS, SPLIT-UPS, AND COMBINATIONS OF RECEIPTS.

         The transfer of this Receipt is registrable on the books of the
Depositary at its Corporate Trust Office by the Owner hereof in person or by a
duly authorized attorney, upon surrender of this Receipt properly endorsed for
transfer or accompanied by proper instruments of transfer and funds sufficient
to pay any applicable transfer taxes and the expenses of the Depositary and upon
compliance with such regulations, if any, as the Depositary may establish for
such purpose. This Receipt may be split into other such Receipts, or may be
combined with other such Receipts into one Receipt, evidencing the same
aggregate number of American Depositary Shares as the Receipt or Receipts

                                     - 45 -
<PAGE>   49
surrendered. As a condition precedent to the execution and delivery,
registration of transfer, split-up, combination, or surrender of any Receipt or
withdrawal of any Deposited Securities, the Depositary, the Custodian, or
Registrar may require payment from the depositor of the Shares or the presentor
of the Receipt of a sum sufficient to reimburse it for any tax or other
governmental charge and any stock transfer or registration fee with respect
thereto (including any such tax or charge and fee with respect to Shares being
deposited or withdrawn) and payment of any applicable fees as provided in this
Receipt, may require the production of proof satisfactory to it as to the
identity and genuineness of any signature and may also require compliance with
any regulations the Depositary may establish consistent with the provisions of
the Deposit Agreement or this Receipt, including, without limitation, this
Article 3.

         The delivery of Receipts against deposits of Shares generally or
against deposits of particular Shares may be suspended, or the transfer of
Receipts in particular instances may be refused, or the registration of transfer
of outstanding Receipts generally may be suspended, during any period when the
transfer books of the Depositary are closed, or if any such action is deemed
necessary or advisable by the Depositary or the Company at any time or from time
to time because of any requirement of law or of any government or governmental
body or commission, or under any provision of the Deposit Agreement or this
Receipt, or for any other reason, subject to the provisions of the following
sentence. The surrender of outstanding Receipts and withdrawal of Deposited
Securities may not be suspended subject only to (i) temporary delays caused by
closing the transfer books of the Depositary or the Company or the deposit of
Shares in connection with voting at a shareholders' meeting, or the payment of
dividends, (ii) the payment of fees, taxes and similar charges, and (iii)
compliance with any U.S. or foreign laws or governmental regulations relating to
the Receipts or to the withdrawal of the Deposited Securities. Without
limitation of the foregoing, the Depositary shall not knowingly accept for
deposit under the Deposit Agreement any Shares required to be registered under
the provisions of the Securities Act of 1933, unless a registration statement is
in effect as to such Shares.

ARTICLE 32. LIABILITY OF OWNER FOR TAXES.

         If any tax or other governmental charge shall become payable with
respect to any Receipt or any Deposited Securities represented hereby, such tax
or other governmental charge shall be payable by the Owner hereof to the
Depositary. The Depositary may refuse to effect any transfer of this Receipt or
any withdrawal of Deposited Securities represented by American Depositary Shares
evidenced by such Receipt until such payment is made, and may withhold any
dividends or other distributions, or may sell for the account of the Owner
hereof any part or all of the Deposited Securities represented by the American
Depositary Shares evidenced by this Receipt, and may apply such dividends or
other distributions or the proceeds of any such sale in payment of such tax or
other governmental charge and the Owner hereof shall remain liable for any
deficiency.

                                     - 46 -
<PAGE>   50
ARTICLE 33. WARRANTIES OF DEPOSITORS.

         Every person depositing Shares hereunder and under the Deposit
Agreement shall be deemed thereby to represent and warrant that such Shares and
each certificate therefor are validly issued, fully paid, non-assessable, and
free of any pre-emptive rights of the holders of outstanding Shares and that the
person making such deposit is duly authorized so to do. Every such person shall
also be deemed to represent that the deposit of such Shares and the sale of
Receipts evidencing American Depositary Shares representing such Shares by that
person are not restricted under the Securities Act of 1933. Such representations
and warranties shall survive the deposit of Shares and issuance of Receipts.

ARTICLE 34. FILING PROOFS, CERTIFICATES, AND OTHER INFORMATION.

         Any person presenting Shares for deposit or any Owner of a Receipt may
be required from time to time to file with the Depositary or the Custodian such
proof of citizenship or residence, exchange control approval, or such
information relating to the registration on the books of the Company or the
Foreign Registrar, if applicable, to execute such certificates and to make such
representations and warranties, as the Depositary may deem necessary or proper.
The Depositary may withhold the delivery or registration of transfer of any
Receipt or the distribution of any dividend or sale or distribution of rights or
of the proceeds thereof or the delivery of any Deposited Securities until such
proof or other information is filed or such certificates are executed or such
representations and warranties made. No Share shall be accepted for deposit
unless accompanied by evidence satisfactory to the Depositary that any necessary
approval has been granted by any governmental body in the United Mexican States
which is then performing the function of the regulation of currency exchange.

ARTICLE 35. CHARGES OF DEPOSITARY.

         The Company agrees to pay the fees, reasonable expenses and
out-of-pocket charges of the Depositary and those of any Registrar only in
accordance with agreements in writing entered into between the Depositary and
the Company from time to time. The Depositary shall present its statement for
such charges and expenses to the Company once every three months. The charges
and expenses of the Custodian are for the sole account of the Depositary.

         The following charges shall be incurred by any party depositing or
withdrawing Shares or by any party surrendering Receipts or to whom Receipts are
issued (including, without limitation, issuance pursuant to a stock dividend or
stock split declared by the Company or an exchange of stock regarding the
Receipts or Deposited Securities or a distribution of Receipts pursuant to
Section 4.03 of the Deposit Agreement), whichever applicable: (1) taxes and
other governmental charges, (2) such registration fees as may from time to time
be in effect for the registration of transfers of Shares generally on the Share
register of the Company, Foreign Registrar or Indeval and applicable to
transfers of

                                     - 47 -
<PAGE>   51
Shares to the name of the Depositary or its nominee or the Custodian or its
nominee on the making of deposits or withdrawals under the terms of the Deposit
Agreement, (3) such cable, telex and facsimile transmission expenses as are
expressly provided in the Deposit Agreement, (4) such expenses as are incurred
by the Depositary in the conversion of foreign currency pursuant to Section 4.05
of the Deposit Agreement, (5) a fee not in excess of $5.00 per 100 American
Depositary Shares (or portion thereof) for the execution and delivery of
Receipts pursuant to Sections 2.03 or 4.03 of the Deposit Agreement and the
surrender of Receipts pursuant to Section 2.05 of the Deposit Agreement and (6)
a fee not in excess of $2.00 per 100 American Depositary Shares (or portion
thereof) for, and deduct such fee from, the distribution of proceeds of sales of
securities or rights pursuant to Sections 4.02 or 4.04, respectively.

         The Depositary, subject to Article 8 hereof, may own and deal in any
class of securities of the Company and its affiliates and in Receipts.

ARTICLE 36. PRE-RELEASE OF RECEIPTS.

         Notwithstanding Section 2.03 of the Deposit Agreement, the Depositary
may execute and deliver Receipts prior to the receipt of Shares pursuant to
Section 2.02 of the Deposit Agreement ("Pre-Release"). The Depositary may,
pursuant to Section 2.05 of the Deposit Agreement, deliver Shares upon the
receipt and cancellation of Receipts which have been Pre-Released, whether or
not such cancellation is prior to the termination of such Pre-Release or the
Depositary knows that such Receipt has been Pre-Released. The Depositary may
receive Receipts in lieu of Shares in satisfaction of a Pre-Release. Each
Pre-Release will be (a) preceded or accompanied by a written representation from
the person to whom Receipts are to be delivered that such person, or its
customer, owns the Shares or Receipts to be remitted, as the case may be, (b) at
all times fully collateralized with cash or such other collateral as the
Depositary deems appropriate, (c) terminable by the Depositary on not more than
five (5) business days notice, and (d) subject to such further indemnities and
credit regulations as the Depositary deems appropriate. The number of American
Depositary Shares which are outstanding at any time as a result of Pre-Releases
will not normally exceed thirty percent (30%) of the Shares deposited under the
Deposit Agreement; provided, however, that the Depositary reserves the right to
change or disregard such limit from time to time as it deems appropriate.

         The Depositary may retain for its own account any compensation received
by it in connection with the foregoing.

ARTICLE 37. TITLE TO RECEIPTS.

         It is a condition of this Receipt and every successive holder and Owner
of this Receipt by accepting or holding the same consents and agrees, that title
to this Receipt when properly endorsed or accompanied by proper instruments of
transfer, is transferable by delivery with the same effect as in the case of a
negotiable instrument, provided,

                                     - 48 -
<PAGE>   52
however, that the Depositary, notwithstanding any notice to the contrary, may
treat the person in whose name this Receipt is registered on the books of the
Depositary as the absolute owner hereof for the purpose of determining the
person entitled to distribution of dividends or other distributions or to any
notice provided for in the Deposit Agreement or for all other purposes.

ARTICLE 38. VALIDITY OF RECEIPT.

         This Receipt shall not be entitled to any benefits under the Deposit
Agreement or be valid or obligatory for any purpose, unless this Receipt shall
have been executed by the Depositary by the manual or facsimile signature of a
duly authorized signatory of the Depositary.

ARTICLE 39. REPORTS; INSPECTION OF TRANSFER BOOKS.

         The Company is subject to the reporting requirements of the Securities
Exchange Act of 1934 and accordingly files certain reports with the Securities
and Exchange Commission (the "Commission"). Such reports and communications will
be available for inspection and copying by holders and Owners at the public
reference facilities maintained by the Commission located at 450 Fifth Street,
N.W., Washington, D.C. 20549.

         The Depositary will make available for inspection by Owners of Receipts
at its Corporate Trust Office any reports and communications, including any
proxy soliciting material, received from the Company which are both (a) received
by the Depositary as the holder of the Deposited Securities and (b) made
generally available to the holders of such Deposited Securities by the Company.
The Depositary will also send to Owners of Receipts copies of such reports when
furnished by the Company pursuant to the Deposit Agreement. Any such reports and
communications, including any such proxy soliciting material, furnished to the
Depositary by the Company shall be furnished in English to the extent such
materials are required to be translated into English pursuant to any regulations
of the Commission.

         The Depositary will keep books for the registration of Receipts and
transfers of Receipts which at all reasonable times shall be open for inspection
by the Owners of Receipts provided that such inspection shall not be for the
purpose of communicating with Owners of Receipts in the interest of a business
or object other than the business of the Company or a matter related to the
Deposit Agreement or the Receipts.

ARTICLE 40. DIVIDENDS AND DISTRIBUTIONS.

         Whenever the Depositary receives any cash dividend or other cash
distribution on any Deposited Securities, the Depositary will, if at the time of
receipt thereof any amounts received in a foreign currency can in the judgment
of the Depositary be converted on a reasonable basis into United States dollars
transferable to the United

                                     - 49 -
<PAGE>   53
States, and subject to the Deposit Agreement, convert such dividend or
distribution into dollars and will distribute the amount thus received (net of
the expenses of the Depositary as provided in Article 7 hereof and Section 5.09
of the Deposit Agreement) to the Owners of Receipts entitled thereto, provided,
however, that in the event that the Company or the Depositary is required to
withhold and does withhold from any cash dividend or other cash distribution in
respect of any Deposited Securities an amount on account of taxes, the amount
distributed to the Owners of the Receipts evidencing American Depositary Shares
representing such Deposited Securities shall be reduced accordingly.

         Subject to the provisions of Section 4.11 and 5.09 of the Deposit
Agreement, whenever the Depositary receives any distribution other than a
distribution described in Sections 4.01, 4.03 or 4.04 of the Deposit Agreement,
the Depositary will cause the securities or property received by it to be
distributed to the Owners of Receipts entitled thereto, in any manner that the
Depositary may deem equitable and practicable for accomplishing such
distribution; provided, however, that if in the opinion of the Depositary such
distribution cannot be made proportionately among the Owners of Receipts
entitled thereto, or if for any other reason the Depositary deems such
distribution not to be feasible, the Depositary may adopt such method as it may
deem equitable and practicable for the purpose of effecting such distribution,
including, but not limited to, the public or private sale of the securities or
property thus received, or any part thereof, and the net proceeds of any such
sale (net of the fees of the Depositary as provided in Article 7 hereof and
Section 5.09 of the Deposit Agreement) shall be distributed by the Depositary to
the Owners of Receipts entitled thereto as in the case of a distribution
received in cash.

         If any distribution consists of a dividend in, or free distribution of,
Shares, the Depositary may and shall if the Company shall so request, distribute
to the Owners of outstanding Receipts entitled thereto, additional Receipts
evidencing an aggregate number of American Depositary Shares representing the
amount of Shares received as such dividend or free distribution subject to the
terms and conditions of the Deposit Agreement with respect to the deposit of
Shares and the issuance of American Depositary Shares evidenced by Receipts,
including the withholding of any tax or other governmental charge as provided in
Section 4.11 of the Deposit Agreement and the payment of the fees of the
Depositary as provided in Article 7 hereof and Section 5.09 of the Deposit
Agreement. In lieu of delivering Receipts for fractional American Depositary
Shares in any such case, the Depositary will sell the amount of Shares
represented by the aggregate of such fractions and distribute the net proceeds,
all in the manner and subject to the conditions set forth in the Deposit
Agreement. If additional Receipts are not so distributed, each American
Depositary Share shall thenceforth also represent the additional Shares
distributed upon the Deposited Securities represented thereby.

         In the event that the Depositary determines that any distribution in
property (including Shares and rights to subscribe therefor) is subject to any
tax or other

                                     - 50 -
<PAGE>   54
governmental charge which the Depositary is obligated to withhold, the
Depositary may by public or private sale dispose of all or a portion of such
property (including Shares and rights to subscribe therefor) in such amounts and
in such manner as the Depositary deems necessary and practicable to pay any such
taxes or charges, and the Depositary shall distribute the net proceeds of any
such sale after deduction of such taxes or charges to the Owners of Receipts
entitled thereto.

ARTICLE 41. RIGHTS.

         In the event that the Company shall offer or cause to be offered to the
holders of any Deposited Securities any rights to subscribe for additional
Shares or any rights of any other nature, the Depositary shall have discretion
as to the procedure to be followed in making such rights available to any Owners
or in disposing of such rights on behalf of any Owners and making the net
proceeds available to such Owners or, if by the terms of such rights offering or
for any other reason, the Depositary may not either make such rights available
to any Owners or dispose of such rights and make the net proceeds available to
such Owners, then the Depositary shall allow the rights to lapse. If at the time
of the offering of any rights the Depositary determines in its discretion that
it is lawful and feasible to make such rights available to all or certain Owners
but not to other Owners, the Depositary may distribute to any Owner to whom it
determines the distribution to be lawful and feasible, in proportion to the
number of American Depositary Shares held by such Owner, warrants or other
instruments therefor in such form as it deems appropriate.

         In circumstances in which rights would otherwise not be distributed, if
an Owner of Receipts requests the distribution of warrants or other instruments
in order to exercise the rights allocable to the American Depositary Shares of
such Owner hereunder, the Depositary will make such rights available to such
Owner upon written notice from the Company to the Depositary that (a) the
Company has elected in its sole discretion to permit such rights to be exercised
and (b) such Owner has executed such documents as the Company has determined in
its sole discretion are reasonably required under applicable law and the opinion
referred to below.

         Subject to applicable law and as agreed to by the Company and the
Depositary in each instance, the Depositary shall also assist the Company in
making private placements or other limited offerings of rights and the
securities offered thereby upon the request of the Company.

         If the Depositary has distributed warrants or other instruments for
rights to all or certain Owners, then upon instruction from such an Owner
pursuant to such warrants or other instruments to the Depositary from such Owner
to exercise such rights, upon payment by such Owner to the Depositary for the
account of such Owner of an amount equal to the purchase price of the Shares to
be received upon the exercise of the rights, and upon payment of the fees of the
Depositary and any other charges as set forth in such warrants or other
instruments, the Depositary shall, on behalf of such Owner, exercise the

                                     - 51 -
<PAGE>   55
rights and purchase the Shares, and the Company shall cause the Shares so
purchased to be delivered to the Depositary on behalf of such Owner. As agent
for such Owner, the Depositary will cause the Shares so purchased to be
deposited pursuant to Section 2.02 of the Deposit Agreement, and shall, pursuant
to Section 2.03 of the Deposit Agreement, execute and deliver Receipts to such
Owner. In the case of a distribution pursuant to the second or third paragraph
of this Article 13, such Receipts shall be legended as reasonably requested by
the Company in accordance with applicable U.S. laws as appropriate, and shall be
subject to the appropriate restrictions on sale, deposit, cancellation, and
transfer under such laws.

         If the Depositary determines in its discretion that it is not lawful
and feasible to make such rights available to all or certain Owners, it may sell
the rights, warrants or other instruments in proportion to the number of
American Depositary Shares held by the Owners to whom it has determined it may
not lawfully or feasibly make such rights available, and allocate the net
proceeds of such sales (net of the fees of the Depositary as provided in Section
5.09 of the Deposit Agreement and all taxes and governmental charges payable in
connection with such rights and subject to the terms and conditions of the
Deposit Agreement) for the account of such Owners otherwise entitled to such
rights, warrants or other instruments, upon an averaged or other practical basis
without regard to any distinctions among such Owners because of exchange
restrictions or the date of delivery of any Receipt or otherwise.

         The Depositary will not offer rights to Owners unless both the rights
and the securities to which such rights relate are either exempt from
registration under the Securities Act of 1933 with respect to a distribution to
all Owners or are registered under the provisions of such Act. If an Owner of
Receipts requests the distribution of warrants or other instruments,
notwithstanding that there has been no such registration under such Act, the
Depositary shall not effect such distribution unless it has received an opinion
from recognized counsel in the United States for the Company upon which the
Depositary may rely that such distribution to such Owner is exempt from such
registration.

         The Depositary shall not be responsible to Owners for any failure to
determine that it may be lawful or feasible to make such rights available to
Owners in general or any Owner in particular.

ARTICLE 42. CONVERSION OF FOREIGN CURRENCY.

         Whenever the Depositary shall receive foreign currency, by way of
dividends or other distributions or the net proceeds from the sale of
securities, property or rights, and if at the time of the receipt thereof the
foreign currency so received can in the judgment of the Depositary be converted
on a reasonable basis into Dollars and the resulting Dollars transferred to the
United States, the Depositary shall convert or cause to be converted, by sale or
in any other manner that it may determine, such foreign currency into Dollars,
and such Dollars shall be distributed to the Owners entitled thereto or, if the

                                     - 52 -
<PAGE>   56
Depositary shall have distributed any warrants or other instruments which
entitle the holders thereof to such Dollars, then to the holders of such
warrants and/or instruments upon surrender thereof for cancellation. Such
distribution may be made upon an averaged or other practicable basis without
regard to any distinctions among Owners on account of exchange restrictions, the
date of delivery of any Receipt or otherwise and shall be net of any expenses of
conversion into Dollars incurred by the Depositary as provided in Section 5.09
of the Deposit Agreement.

         If such conversion or distribution can be effected only with the
approval or license of any government or agency thereof, the Depositary shall
file such application for approval or license, if any, as it may deem desirable.

         If at any time the Depositary shall determine that in its judgment any
foreign currency received by the Depositary is not convertible on a reasonable
basis into Dollars transferable to the United States, or if any approval or
license of any government or agency thereof which is required for such
conversion is denied or in the opinion of the Depositary is not obtainable, or
if any such approval or license is not obtained within a reasonable period as
determined by the Depositary, the Depositary may distribute the foreign currency
(or an appropriate document evidencing the right to receive such foreign
currency) received by the Depositary to, or in its discretion may hold such
foreign currency uninvested and without liability for interest thereon for the
respective accounts of, the Owners entitled to receive the same.

         If any such conversion of foreign currency, in whole or in part, cannot
be effected for distribution to some of the Owners entitled thereto, the
Depositary may in its discretion make such conversion and distribution in
Dollars to the extent permissible to the Owners entitled thereto and may
distribute the balance of the foreign currency received by the Depositary to, or
hold such balance uninvested and without liability for interest thereon for the
respective accounts of, the Owners entitled thereto.

ARTICLE 43. RECORD DATES.

         Whenever any cash dividend or other cash distribution shall become
payable or any distribution other than cash shall be made, or whenever rights
shall be issued with respect to the Deposited Securities, or whenever for any
reason the Depositary causes a change in the number of Shares that are
represented by each American Depositary Share, or whenever the Depositary shall
receive notice of any meeting of holders of Shares or other Deposited
Securities, the Depositary shall fix a record date (a) for the determination of
the Owners of Receipts who shall be (i) entitled to receive such dividend,
distribution or rights or the net proceeds of the sale thereof or (ii) entitled
to give instructions for the exercise of voting rights at any such meeting, or
(b) on or after which each American Depositary Share will represent the changed
number of Shares, subject to the provisions of the Deposit Agreement.

                                     - 53 -
<PAGE>   57
ARTICLE 44. VOTING OF DEPOSITED SECURITIES.

         Upon receipt of notice of any meeting of holders of Shares or other
Deposited Securities, if requested in writing by the Company, the Depositary
shall, as soon as practicable thereafter, mail to the Owners of Receipts a
notice, the form of which notice shall be in the sole discretion of the
Depositary, which shall contain (a) such information as is contained in such
notice of meeting, (b) a statement that the Owners of Receipts as of the close
of business on a specified record date will be entitled, subject to any
applicable provision of law and of the Articles of Association of the Company,
to instruct the Depositary as to the exercise of the voting rights, if any,
pertaining to the amount of Shares or other Deposited Securities represented by
their respective American Depositary Shares and (c) a statement as to the manner
in which such instructions may be given, (or deemed given in accordance with the
last sentence of Section 4.07 of the Deposit Agreement if no instruction is
received) to the Depositary. Upon the written request of an Owner of a Receipt
on such record date, received on or before the date established by the
Depositary for such purpose, the Depositary shall endeavor in so far as
practicable to vote or cause to be voted the amount of Shares or other Deposited
Securities represented by such American Depositary Shares evidenced by such
Receipt in accordance with the instructions set forth in such request. If, after
complying with the procedures set forth in Section 4.07 of the Deposit
Agreement, the Depositary does not receive instructions from the Owners of any
Receipts on or before the date established by the Depositary for such purpose,
the Depositary shall give a proxy for the Shares represented by the American
Depositary Shares evidenced by such Receipts to a person designated by the
Company to vote such Shares in regard to any matter in the same proportions as
all of the other Shares that are voted with regard to such matter.

ARTICLE 45. CHANGES AFFECTING DEPOSITED SECURITIES.

         In circumstances where the provisions of Section 4.03 of the Deposit
Agreement do not apply, upon any change in nominal value, change in par value,
split-up, consolidation, or any other reclassification of Deposited Securities,
or upon any recapitalization, reorganization, merger or consolidation, or sale
of assets affecting the Company or to which it is a party, any securities which
shall be received by the Depositary or a Custodian in exchange for or in
conversion of or in respect of Deposited Securities shall be treated as new
Deposited Securities under the Deposit Agreement, and American Depositary Shares
shall thenceforth represent the new Deposited Securities so received in exchange
or conversion, unless additional Receipts are delivered pursuant to the
following sentence. In any such case the Depositary may, and shall if the
Company shall so request, execute and deliver additional Receipts as in the case
of a dividend in Shares, or call for the surrender of outstanding Receipts to be
exchanged for new Receipts specifically describing such new Deposited
Securities.

                                     - 54 -
<PAGE>   58
ARTICLE 46. LIABILITY OF THE COMPANY AND DEPOSITARY.

         Neither the Depositary nor the Company shall incur any liability to any
Owner or holder of any Receipt, if by reason of any provision of any present or
future law or regulation of the United States or any other country, or of any
other governmental or regulatory authority, or by reason of any provision,
present or future, of the Estatutos Sociales of the Company, or by reason of any
act of God or war or other circumstances beyond its control, the Depositary or
the Company shall be prevented or forbidden from or be subject to any civil or
criminal penalty on account of doing or performing any act or thing which by the
terms of the Deposit Agreement it is provided shall be done or performed; nor
shall the Depositary or the Company incur any liability to any Owner or holder
of a Receipt by reason of any non-performance or delay, caused as aforesaid, in
the performance of any act or thing which by the terms of the Deposit Agreement
it is provided shall or may be done or performed, or by reason of any exercise
of, or failure to exercise, any discretion provided for in the Deposit
Agreement. Where, by the terms of a distribution pursuant to Sections 4.01,
4.02, or 4.03 of the Deposit Agreement, or an offering or distribution pursuant
to Section 4.04 of the Deposit Agreement, such distribution or offering may not
be made available to Owners of Receipts, and the Depositary may not dispose of
such distribution or offering on behalf of such Owners and make the net proceeds
available to such Owners, then the Depositary shall not make such distribution
or offering, and shall allow any rights, if applicable, to lapse. Neither the
Company nor the Depositary assumes any obligation or shall be subject to any
liability under the Deposit Agreement to Owners or holders of Receipts, except
that they agree to perform their obligations specifically set forth in the
Deposit Agreement without negligence or bad faith. The Depositary shall not be
subject to any liability with respect to the validity or worth of the Deposited
Securities. Neither the Depositary nor the Company shall be under any obligation
to appear in, prosecute or defend any action, suit, or other proceeding in
respect of any Deposited Securities or in respect of the Receipts, which in its
opinion may involve it in expense or liability, unless indemnity satisfactory to
it against all expense and liability shall be furnished as often as may be
required, and the Custodian shall not be under any obligation whatsoever with
respect to such proceedings, the responsibility of the Custodian being solely to
the Depositary. Neither the Depositary nor the Company shall be liable for any
action or nonaction by it in reliance upon the advice of or information from
legal counsel, accountants, any person presenting Shares for deposit, any Owner
or holder of a Receipt, or any other person believed by it in good faith to be
competent to give such advice or information. The Depositary shall not be
responsible for any failure to carry out any instructions to vote any of the
Deposited Securities, or for the manner in which any such vote is cast or the
effect of any such vote, provided that any such action or nonaction is in good
faith and without negligence. The Depositary shall not be liable for any acts or
omissions made by a successor depositary whether in connection with a previous
act or omission of the Depositary or in connection with a matter arising wholly
after the removal or resignation of the Depositary, provided that in connection
with the issue out of which such potential liability arises, the Depositary
performed its obligations without negligence or bad faith

                                     - 55 -
<PAGE>   59
while it acted as Depositary. The Company agrees to indemnify the Depositary,
its directors, employees, agents and affiliates and any Custodian against, and
hold each of them harmless from, any liability or expense (including, but not
limited to, the expenses of counsel) which may arise out of acts performed or
omitted, in accordance with the provisions of the Deposit Agreement and of the
Receipts, as the same may be amended, modified, or supplemented from time to
time, (i) by either the Depositary or a Custodian or their respective directors,
employees, agents and affiliates, except for any liability or expense arising
out of the negligence or bad faith of either of them, or (ii) by the Company or
any of its directors, employees, agents and affiliates. No disclaimer of
liability under the Securities Act of 1933 is intended by any provision of the
Deposit Agreement.

ARTICLE 47. RESIGNATION AND REMOVAL OF THE DEPOSITARY; APPOINTMENT OF SUCCESSOR
     CUSTODIAN.

         The Depositary may at any time resign as Depositary hereunder by
written notice of its election so to do delivered to the Company, such
resignation to take effect upon the appointment of a successor depositary and
its acceptance of such appointment as provided in the Deposit Agreement. The
Depositary may at any time be removed by the Company by written notice of such
removal, effective upon the appointment of a successor depositary and its
acceptance of such appointment as provided in the Deposit Agreement. Whenever
the Depositary in its discretion determines that it is in the best interest of
the Owners of Receipts to do so, it may appoint a substitute or additional
custodian or custodians.

ARTICLE 48. AMENDMENT.

         The form of the Receipts and any provisions of the Deposit Agreement
may at any time and from time to time be amended by agreement between the
Company and the Depositary in any respect which they may deem necessary or
desirable. Any amendment which shall impose or increase any fees or charges
(other than taxes and other governmental charges, registration fees and cable,
telex or facsimile transmission costs, delivery costs or other such expenses),
or which shall otherwise prejudice any substantial existing right of Owners of
Receipts, shall, however, not become effective as to outstanding Receipts until
the expiration of thirty days after notice of such amendment shall have been
given to the Owners of outstanding Receipts. Every Owner of a Receipt at the
time any amendment so becomes effective shall be deemed, by continuing to hold
such Receipt, to consent and agree to such amendment and to be bound by the
Deposit Agreement as amended thereby. In no event shall any amendment impair the
right of the Owner of any Receipt to surrender such Receipt and receive therefor
the Deposited Securities represented thereby except in order to comply with
mandatory provisions of applicable law.

                                     - 56 -
<PAGE>   60
ARTICLE 49. TERMINATION OF DEPOSIT AGREEMENT.

         The Depositary at any time at the direction of the Company, shall
terminate the Deposit Agreement by mailing notice of such termination to the
Owners of all Receipts then outstanding at least 90 days prior to the date fixed
in such notice for such termination. The Depositary may likewise terminate the
Deposit Agreement by mailing notice of such termination to the Company and the
Owners of all Receipts then outstanding if at any time 90 days shall have
expired after the Depositary shall have delivered to the Company a written
notice of its election to resign and a successor depositary shall not have been
appointed and accepted its appointment as provided in the Deposit Agreement. On
and after the date of termination, the Owner of a Receipt will, upon (a)
surrender of such Receipt at the Corporate Trust Office of the Depositary, (b)
payment of the fee of the Depositary for the surrender of Receipts referred to
in Section 2.05 of the Deposit Agreement, and (c) payment of any applicable
taxes or governmental charges, be entitled to delivery, to him or upon his
order, of the amount of Deposited Securities represented by the American
Depositary Shares evidenced by such Receipt. If any Receipts shall remain
outstanding after the date of termination, the Depositary thereafter shall
discontinue the registration of transfers of Receipts, shall suspend the
distribution of dividends to the Owners thereof, and shall not give any further
notices or perform any further acts under the Deposit Agreement, except that the
Depositary shall continue to collect dividends and other distributions
pertaining to Deposited Securities, shall sell rights as provided in the Deposit
Agreement, and shall continue to deliver Deposited Securities, together with any
dividends or other distributions received with respect thereto and the net
proceeds of the sale of any rights or other property, in exchange for Receipts
surrendered to the Depositary (after deducting, in each case, the fee of the
Depositary for the surrender of a Receipt, any expenses for the account of the
Owner of such Receipt in accordance with the terms and conditions of the Deposit
Agreement, and any applicable taxes or governmental charges). At any time after
the expiration of one year from the date of termination, the Depositary may sell
the Deposited Securities then held under the Deposit Agreement and may
thereafter hold uninvested the net proceeds of any such sale, together with any
other cash then held by it thereunder, unsegregated and without liability for
interest, for the pro rata benefit of the Owners of Receipts which have not
theretofore been surrendered, such Owners thereupon becoming general creditors
of the Depositary with respect to such net proceeds. After making such sale, the
Depositary shall be discharged from all obligations under the Deposit Agreement,
except to account for such net proceeds and other cash (after deducting, in each
case, the fee of the Depositary for the surrender of a Receipt, any expenses for
the account of the Owner of such Receipt in accordance with the terms and
conditions of the Deposit Agreement, and any applicable taxes or governmental
charges). Upon the termination of the Deposit Agreement, the Company shall be
discharged from all obligations under the Deposit Agreement except for its
obligations to the Depositary with respect to indemnification, charges, and
expenses.

                                     - 57 -
<PAGE>   61
                    (ASSIGNMENT AND TRANSFER SIGNATURE LINES)

NOTE:             The signature to any endorsement hereon must correspond with
                  the name as written upon the face of this Receipt in every
                  particular, without alteration or enlargement or any change
                  whatever.

                  If the endorsement be executed by an attorney, executor,
                  administrator, trustee or guardian, the person executing the
                  endorsement must give his full title in such capacity and
                  proper evidence of authority to act in such capacity, if not
                  on file with the Depositary, must be forwarded with this
                  Receipt.

                  All endorsements or assignments of Receipts must be guaranteed
                  by an "eligible guarantor institution" (including, but not
                  limited to, a New York Stock Exchange member firm or member of
                  the Clearing House of the American Stock Exchange Clearing
                  Corporation or by a bank or trust company having an office or
                  correspondent in The City of New York) meeting the
                  requirements of the Depositary, which requirements will
                  include membership or participation in STAMP or such other
                  "signature guarantee program" as may be determined by the
                  Depositary in addition to, or in substitution for, STAMP, all
                  in accordance with the Securities Exchange Act of 1934, as
                  amended.

                                     - 58 -<PAGE>   1
                                                                    EXHIBIT 10.1

                         COMMUNICATION AND TECHNOLOGICAL
                           DEVELOPMENT SUBSECRETARIAT

         SEAL                        2.   529

   COMMUNICATION AND
       TRANSPORT
      SECRETARIAT

                           Mexico, D.F., October 13, 1989.

                           C. CARLOS PERALTA QUINTERO
                           Legal Representative of
                           Servicio Organizado Secretarial, S.A.
                           (Organized Secretarial Service, Anonymous Society)
                           Jorge Eliot No. 12-7th floor.
                           Colonia Polanco
                           Mexico, D.F.

                           Enclosed to the present official communication is an
                           authorization granted by this Secretariat based on
                           the Third Clause of the Concession granted to
                           Servicio Organizado Secretarial, S.A., dated April
                           1st, 1957, to incorporate cellular technology to the
                           public service of mobile radiotelephony which said
                           Concession protects.

                           The commercial operation of the authorized system
                           will be effected under the terms of the 18th
                           Condition in the granted authorization.

                           I reiterate the surety of my favored and
                           distinguished consideration.

                           EFFECTIVE SUFFRAGE. NO REELECTION.
                           THE SUBSECRETARY.

                           Signature. (Illegible).

                           CARLOS MIER Y TERAN
<PAGE>   2
AUTHORIZATION GRANTED BY THE FEDERAL GOVERNMENT THROUGH THE COMMUNICATION AND
TRANSPORT SECRETARIAT, FROM HERE ON "THE SECRETARIAT", REPRESENTED BY THE HEAD
OF THE SECRETARIAT, ANDRES CASO LOMBARDO, TO THE COMPANY SERVICIO ORGANIZADO
SECRETARIAL, S.A. (ORGANIZED SECRETARIAL SERVICE, ANONYMOUS SOCIETY), FROM HERE
ON "S.O.S.", TO INCORPORATE CELLULAR TECHNOLOGY TO THE PUBLIC SERVICE OF MOBILE
RADIOTELEPHONY FOR WHICH IT HAS A CONCESSION INCLUDING THE REGION COMPRISED BY
THE FEDERAL DISTRICT AND THE MEXICAN STATES OF MORELOS AND HIDALGO, IN
ACCORDANCE WITH THE FOLLOWING BACKGROUND INFORMATION, TERMS AND CONDITIONS.

                  B A C K G R O U N D   I N F O R M A T I O N

I.       THE NATIONAL DEVELOPMENT PLAN FOR 1989-94 ESTABLISHES THE IMPORTANCE OF
         MODERNIZING TELECOMMUNICATIONS FOR NATIONAL DEVELOPMENT AND EMPHASIZES
         THE NEED TO DIVERSIFY THE SERVICES, TO BETTER THEIR QUALITY AND TO
         EXPAND THEIR COVERAGE WITH MORE PARTICIPATION FROM PRIVATE INDUSTRY.

II.      "THE SECRETARIAT", GRANTED THE COMPANY "S.O.S." A CONCESSION TITLE
         DATED APRIL 1st, 1957, WITH A 50 YEAR DURATION, TO INSTALL, OPERATE AND
         EXPLOIT FIXED AND MOBILE RADIOTELEPHONIC EQUIPMENT NEEDED TO PROVIDE
         THE PUBLIC SERVICE OF TELEPHONES ON BOARD VEHICLES, UTILIZING FOR SUCH
         PURPOSE THE TOTAL BAND OF 132 TO 144 MHz IN THE ENTIRE REPUBLIC.

III.     "THE SECRETARIAT", NOTIFIED THE COMPANY "S.O.S." IN THE OFFICIAL
         COMMUNICATION 078 DATED JANUARY 5, 1978, THAT IT WAS GRANTING IT A
         2-YEAR TERM TO CLEAR AND ABANDON THE 132-136 MHz BAND BECAUSE OF PUBLIC
         INTEREST REASONS, INFORMING IT THAT THE CONCESSIONED SERVICE WOULD HAVE
         TO BE PLANNED AT THE 450-470.
         MHz BAND.

IV.      "THE SECRETARIAT" MODIFIED, AT THE REQUEST OF "S.O.S.", IN THE OFFICIAL
         COMMUNICATION 3646 DATED JULY 11, 1986, THE MENTIONED CONCESSION TITLE
         TO ADD TO THE CONCESSION'S OBJECT, THE INSTALLATION, OPERATION,
         MAINTENANCE AND EXPLOITATION OF THE RURAL TELEPHONY PUBLIC SERVICE.

V.       THE "S.O.S." COMPANY, IN ACCORDANCE WITH THE THIRD CLAUSE OF THE
         CONCESSION TITLE, IS OBLIGATED TO MODERNIZE THE SERVICES WHICH ARE
         OBJECT OF SAID CONCESSION AND TO INTRODUCE, IN THE FUTURE, ALL OF THOSE
         INNOVATIONS, MODIFICATIONS AND TECHNICAL REGULATIONS OF EXPLOITATION
         THAT "THE SECRETARIAT" AUTHORIZES IN ORDER TO ACHIEVE A MORE EFFICIENT
         SERVICE.

         THE BEFORE-MENTIONED ACCORDING TO THE COMPANY'S ECONOMIC POSSIBILITIES.

VI.      THE TECHNOLOGICAL ADVANCE IN SWITHOVER EQUIPMENT AND IN CELLULAR
         RADIOCOMMUNICATION SYSTEMS NOW ALLOW A MORE EFFICIENT USE OF THE

                                       2
<PAGE>   3
         RADIOELECTRIC SPECTRUM TO SERVICE A GREATER NUMBER OF USERS WITH A
         BETTER QUALITY AND LOWER COST RADIOTELEPHONY SERVICE.

VII.     THE COMPANY "S.O.S."', THROUGH DOCUMENTS DATED DECEMBER 8, 1983, JULY
         14, 1987, JUNE 1 AND NOVEMBER 16, 1988, REQUESTED, TO "THE
         SECRETARIAT", AUTHORIZATION TO INCORPORATE CELLULAR TECHNOLOGY TO THE
         ALREADY CONCESSIONED PUBLIC RADIOTELEPHONY SERVICES.

VIII.    "THE SECRETARIAT", IN ACCORDANCE WITH THE BACKGROUND INFORMATION AND
         PRESENTED REQUESTS, AND ACCORDING TO ARTICLE 36 OF THE ORGANIC LAW OF
         THE FEDERAL PUBLIC ADMINISTRATION, AS WELL AS ARTICLES 3, 41, 48, 51
         AND OTHERS RELATIVE TO THE LAW OF GENERAL WAYS OF COMMUNICATION, AND
         BASED UPON THE THIRD CLAUSE OF THE MENTIONED CONCESSION TITLE, GRANTS
         THE FOLLOWING:

                            A U T H O R I Z A T I O N

THE FEDERAL GOVERNMENT, THROUGH "THE SECRETARIAT", CONSIDERING THAT "S.O.S."
WILL COMPLY WITH THE RESPECTIVE LEGAL, TECHNICAL AND ECONOMICAL REQUIREMENTS,
GRANTS IT AUTHORIZATION TO INTRODUCE CELLULAR TECHNOLOGY FOR THE MODERNIZATION
OF MOBILE AND FIXED RADIOTELEPHONY SERVICES, FOR WHICH IT HAS CONCESSION AND
AUTHORIZATION IN THE REGION WHICH INCLUDES THE FEDERAL DISTRICT AND THE MEXICAN
STATES OF MORELOS AND HIDALGO, UNDER THE FOLLOWING:

                               C O N D I T I O N S

                           I. AUTHORIZATION'S COVERAGE

1a.      APPLICABLE LEGISLATION.

         THE PUBLIC SERVICE WHICH IS OBJECT OF THIS AUTHORIZATION, IS GOVERNED
         BY THE LAW OF GENERAL WAYS OF COMMUNICATION AND THE LAW OF NATIONAL
         ASSETS AND THEIR REGULATIONS; BY THE INTERNATIONAL CONTRACTS,
         AGREEMENTS AND TREATIES REGARDING THIS SUBJECT TO WHICH THE MEXICAN
         GOVERNMENT IS SUBSCRIBED AND THOSE TO WHICH IT WILL SUBSCRIBE AND
         RATIFY IN THE FUTURE, BECAUSE OF THE TERMS OF THIS CONCESSION AND THIS
         AUTHORIZATION.

2a.      PUBLIC NETWORK OF MOBILE RADIOTELEPHONY WITH CELLULAR TECHNOLOGY.

         FOR THE AUTHORIZATION'S PURPOSES, THE PUBLIC NETWORK OF MOBILE
         RADIOTELEPHONY WITH CELLULAR TECHNOLOGY, FROM HERE ON "THE NETWORK",
         REFERS TO THE INFRASTRUCTURE THAT INTEGRATES WITH THE CELLULAR
         SWITCHOVER CENTRALS, THE BASE RADIOELECTRIC STATIONS, THE LINKS BETWEEN
         CENTRALS AND STATIONS, AND OTHER INSTALLATIONS AND EQUIPMENT INVOLVED,
         REQUIRED FOR THE RENDERING OF SERVICES IN THE AUTHORIZED AREA,
         INCLUDING INTERCONNECTION WITH OTHER PUBLIC TELECOMMUNICATION NETWORKS.

                                       3
<PAGE>   4
         "S.O.S." MUST OPERATE "THE NETWORK" IN THE CELLULAR GROUP "A"
         FREQUENCIES, THAT CONSISTS OF 333 FREQUENCY PAIRS IN THE
         825-835/870-880 MHz BANDS WITH 30 KHz SPACING BETWEEN CHANNELS, AS IS
         INDICATED IN THE ANNEX OF THE PRESENT AUTHORIZATION. SAID FREQUENCY
         BANDS MAY NOT BE MODIFIED WITHOUT PREVIOUS AUTHORIZATION FROM "THE
         SECRETARIAT". LIKEWISE, THE "S.O.S." COMPANY WILL REQUIRE EXPRESS
         AUTHORIZATION FROM "THE SECRETARIAT" TO OPERATE IN OTHER FREQUENCIES
         AND IN OTHER GEOGRAPHICAL ZONES.

         THE MOBILE OR FIXED TERMINAL EQUIPMENT USED BY THE SUBSCRIBER, WHICH
         "S.O.S." OR ANOTHER COMPANY WILL BE ABLE TO SUPPLY, DOES NOT FORM PART
         OF "THE NETWORK".

3a.      RADIOTELEPHONY SERVICES.

         BY MEANS OF "THE NETWORK" AND WITH ANY KIND OF USER TERMINAL EQUIPMENT,
         "S.O.S." MUST GIVE THE FOLLOWING PUBLIC SERVICES:

         a)       URBAN AND SUBURBAN RADIOTELEPHONY.

         b)       RURAL RADIOTELEPHONY.

         c)       LONG DISTANCE RADIOTELEPHONY BY INTERCONNECTION WITH THE
                  CONVENTIONAL PUBLIC TELEPHONE NETWORK OR OTHER NETWORKS
                  AUTHORIZED BY "THE SECRETARIAT".

         d)       PUBLIC RADIOTELEPHONIC STANDS.

4a.      SERVICES OF SELLING, INSTALLATION AND MAINTENANCE OF TERMINAL
         EQUIPMENT.

         "S.O.S." WILL HAVE TO COMMERCIALIZE, INSTALL AND MAINTAIN USER TERMINAL
         EQUIPMENT DIRECTLY OR WITH SEPARATE ACCOUNTING AND THROUGH BRANCH
         COMPANIES OR AGENTS.

         "S.O.S." WILL NOT HAVE THE OBLIGATION TO INSTALL AND MAINTAIN TERMINAL
         EQUIPMENT ACQUIRED THROUGH OTHER COMPANIES.

5a.      SERVICES' COMMERCIALIZATION.

         "S.O.S." WILL BE ABLE TO COMMERCIALIZE THE AUTHORIZED SERVICES DIRECTLY
         OR THROUGH AGENTS WITH THE UNDERSTANDING THAT "S.O.S." WILL BE DIRECTLY
         RESPONSIBLE WITH "THE SECRETARIAT" AND WITH THE USERS OF THE RENDERED
         AUTHORIZED PUBLIC SERVICES. THE CONTRACTS MADE BETWEEN "S.O.S." AND THE
         AGENTS MUST BE PREVIOUSLY AUTHORIZED BY "THE SECRETARIAT".

6a.      COMPLEMENTARY AND AGGREGATED VALUE SERVICES.

         "S.O.S." WILL REQUIRE PREVIOUS AUTHORIZATION FROM "THE SECRETARIAT", IN
         ACCORDANCE WITH THE APPLICABLE LEGISLATION, TO RENDER NEW

                                       4
<PAGE>   5
         COMPLEMENTARY AND AGGREGATED VALUE SERVICES DIFFERENT TO THOSE WHICH
         ARE ALREADY AUTHORIZED.

7a.      EQUAL COMPETITION.

         "S.O.S." WILL NOT BE ABLE, IN ANY EVENT, TO APPLY MONOPOLIZING
         PRACTICES THAT WILL PREVENT EQUAL COMPETITION WITH OTHER COMPANIES IN
         THE ACTIVITIES REFERRED TO IN CONDITIONS: 3a, 4a, 5a AND 6a.

                     II. NETWORK EXPANSION AND MODERNIZATION

8a.      EXPANSION PROGRAM.

         "S.O.S." IS OBLIGATED TO FORMULATE AND PRESENT TO "THE SECRETARIAT"
         EACH YEAR, ITS QUINQUENNIAL PROGRAM IN WHICH, FOR THE FIRST TWO YEARS,
         IT MUST DETAIL QUALITY, COVERAGE AND MODERNIZATION OBJECTIVES. THIS
         PROGRAM WILL BE REVISED WITH "THE SECRETARIAT" WITH THE OBJECT OF
         MAINTAINING CONGRUENCE WITH THE NATIONAL DEVELOPMENT PLAN AND WITH THE
         SECTORIAL TELECOMMUNICATIONS PROGRAM. "S.O.S." MUST INFORM "THE
         SECRETARIAT" ON A YEARLY BASIS, OF ITS FULFILLMENT OF THE PROGRAM.

         "S.O.S." IS OBLIGATED TO INSTALL "THE NETWORK" WITH A MINIMUM CAPACITY
         OF 15,000 USERS IN THE FIRST TWELVE MONTHS AND FOR 100,000 USERS IN THE
         FIRST FIVE YEARS, AS OF THE PRESENT AUTHORIZATION'S DATE, WITH THE
         QUALITY STANDARDS APPROVED BY "THE SECRETARIAT".

         WHEN "S.O.S." INSTALLS THE EQUIPMENT DESTINED TO "THE NETWORK"'S
         OPERATION, IT WILL CONSIDER THE SECURITY AND CONVENIENCE OF THE PUBLIC,
         OF THEIR ASSETS AND OF OTHER PUBLIC SERVICES, IN ORDER NOT TO INTERFERE
         WITH THE NORMAL OPERATION OF THESE.

9a.      "THE NETWORK"'S LINKS.

         "S.O.S." WILL BE ABLE TO INSTALL AND OPERATE THE SWITCHING AND
         TRANSMISSION EQUIPMENT REQUIRED TO CONDUCT COMMUNICATION SIGNALS,
         CONTROL AND SUPERVISION BETWEEN ITS CELLULAR SWITCHOVER CENTRALS AND
         THE BASE RADIOELECTRIC STATIONS AND INTERCONNECTION WITH OTHER
         NETWORKS, OR WILL BE ABLE TO UTILIZE OTHER NETWORKS FROM OTHER
         COMPANIES OR ENTITIES THAT ARE AUTHORIZED BY "THE SECRETARIAT" TO GIVE
         SERVICE TO THIRD PARTIES.

10a.     RURAL RADIOTELEPHONY.

         "S.O.S." IS OBLIGATED TO EXPAND "THE NETWORK"'S COVERAGE IN ORDER TO
         COVER THE RURAL AREAS, IN ACCORDANCE WITH THE PROGRAMS CONCERTED WITH
         "THE SECRETARIAT".

                                       5
<PAGE>   6
11a.     PUBLIC RADIOTELEPHONIC STANDS.

         "S.O.S." IS OBLIGATED TO INSTALL PUBLIC RADIOTELEPHONIC STANDS OF "THE
         NETWORK" IN ITS SERVICE AREA, IN ACCORDANCE WITH THE PROGRAM CONCERTED
         WITH "THE SECRETARIAT".

12a.     EMERGENCY SERVICES.

         "S.O.S." MUST ELABORATE A PLAN CONCERTED WITH "THE SECRETARIAT" TO
         PROVIDE EMERGENCY SERVICES IN CONTINGENCIES.

         "S.O.S." IS OBLIGATED TO PROVIDE FREE OF COST, EMERGENCY SERVICES
         WITHIN ITS CONCESSIONED AREA; LIKEWISE, IT IS OBLIGATED TO GIVE
         ASSISTANCE SERVICES VIA OPERATOR, TO THE EMERGENCY ORGANIZATIONS AND
         INSTITUTIONS GRANTING PRIORITY TO THE CHANNELLING OF THEIR
         COMMUNICATIONS. THE SECURITY AND AID EMERGENCY SERVICES WILL BE
         PROVIDED IN ACCORDANCE WITH THE APPLICABLE INTERNATIONAL AGREEMENTS IN
         THIS MATTER.

13a.     MODERNIZATION.

         "S.O.S." IS OBLIGATED TO DIGITALIZE AND MODERNIZE "THE NETWORK" FOR THE
         AUTHORIZED SERVICE BY MEANS OF INTRODUCING THE TECHNOLOGICAL ADVANCES
         TO BETTER THE EXPLOITATION OF THE AUTHORIZED FREQUENCIES AND THE
         SERVICE'S QUALITY AND PRODUCTIVITY.

14a.     RADIOTELEPHONY TECHNICAL REGULATIONS.

         "S.O.S." IS OBLIGATED TO COMPLY WITH THE TECHNICAL REGULATIONS POINTED
         OUT BY "THE SECRETARIAT" AND TO SUBMIT TO ITS CONSIDERATION THE
         NUMBERING SCHEME, SIGNALIZATION, TRANSMISSION, SWITCHING,
         SYNCHRONIZATION AND RATE SETTING PLANS, CONSIDERING THE NEEDS OF OTHER
         PUBLIC TELECOMMUNICATION SERVICE OPERATORS THAT INTERCONNECT WITH "THE
         NETWORK" AND OF ITS FINAL USERS.

15a      HOMOLOGATION OF EQUIPMENT.

         "S.O.S." MUST UNDERTAKE THE CONSTRUCTION AND ESTABLISHMENT OF THE
         AUTHORIZED "NETWORK" WITH EQUIPMENT HOMOLOGATED BY "THE SECRETARIAT".

16a.     MODIFICATIONS TO "THE NETWORK".

         "S.O.S." MUST OBTAIN AUTHORIZATION FROM "THE SECRETARIAT" TO EFFECT
         SUBSTANTIAL MODIFICATIONS TO "THE NETWORK" WHEN THEY AFFECT THE
         OPERATION OF APPARATUS AND OTHER NETWORKS WITH WHICH IT IS
         INTERCONNECTED.

                                       6
<PAGE>   7
17a.     INDUSTRIAL AND TECHNOLOGICAL INVESTIGATION.

         "S.O.S." IS OBLIGATED TO PROMOTE INDUSTRIAL AND TECHNOLOGICAL
         INVESTIGATION IN THE MATTER OF MOBILE CELLULAR RADIOTELEPHONY AND
         SIMILAR SERVICES THROUGH PROGRAMS CONCERTED WITH THE MEXICAN
         COMMUNICATIONS INSTITUTE AND OTHER 'INVESTIGATION AND DEVELOPMENT
         INSTITUTES.

         "S.O.S." COMPROMISES TO AID IN THE MODERNIZATION OF THE
         TELECOMMUNICATION INFRASTRUCTURE WHICH "THE SECRETARIAT" HAS DESIGNATED
         FOR THE SUPERVISION AND CONTROL OF THE RADIOELECTRIC SPECTRUM UNDER THE
         TERMS THAT IT INDICATES.

                     III. OPERATION AND QUALITY OF SERVICE.

18a.     COMMERCIAL OPERATION.

         "S.O.S." WILL REQUIRE EXPRESS AUTHORIZATION BY "THE SECRETARIAT" TO
         INITIATE COMMERCIAL OPERATION OF THE SERVICE, FOR WHICH "THE
         SECRETARIAT" WILL VERIFY, BEFORE GRANTING, BY TECHNICAL AND
         ADMINISTRATIVE INSPECTION, THAT "THE NETWORK" IS IN COMPLIANCE WITH THE
         INITIAL PROJECT AND THE RESPECTIVE TECHNICAL REGULATIONS.

19a.     EQUAL TREATMENT.

         "S.O.S." IS OBLIGATED TO PROVIDE TO THE PUBLIC, THE SERVICES OBJECT OF
         THIS AUTHORIZATION, IN AN EQUAL BASIS; BECAUSE OF THIS, IT IS
         PROHIBITED TO ESTABLISH PRIVILEGES AND DISTINCTIONS IN FAVOR OR AGAINST
         ANY DETERMINED NATURAL OR MORAL PERSON.

20a.     SERVICE QUALITY AND CONTINUITY.

         "S.O.S." IS OBLIGATED TO RENDER THE PUBLIC SERVICE IN AN EFFICIENT AND
         CONTINUOUS FORM, COMPLYING WITH THE QUALITY AND OPERATION STANDARDS
         THAT "THE SECRETARIAT" ESTABLISHES.

21a.     SERVICE INTERRUPTION.

         WHEN SERVICE IS INTERRUPTED FOR MORE THAN 72 CONSECUTIVE HOURS,
         "S.O.S." WILL REFUND, TO THE USERS, THE PART OF THE FEE THAT
         CORRESPONDS TO THE INTERRUPTION'S DURATION, EVEN WHEN THE SUSPENSION IS
         DUE TO A CONTINGENCY, AND WITHOUT DETRIMENT TO THE ADMINISTRATIVE
         SANCTION THAT WOULD TAKE PLACE.

22a.     QUALITY CONTROL AND MEASUREMENT.

         "S.O.S." IS OBLIGATED TO PUBLISH EVERY TWO YEARS, PREVIOUS AGREEMENT
         WITH "THE SECRETARIAT", A SYSTEM OF QUALITY STANDARDS OF THE SERVICE,
         THAT WILL BE UPDATED PERIODICALLY ACCORDING TO INTERNATIONAL LEVELS.
         LIKEWISE, THE SYSTEM MUST ESTABLISH THE COMPENSATIONS TO

                                       7
<PAGE>   8
         WHICH THE USER WILL HAVE A RIGHT, IN THE EVENT THAT "S.O.S." DOES NOT
         COMPLY WITH THE ESTABLISHED QUALITY STANDARDS.

         "S.O.S." IS OBLIGATED TO ESTABLISH ITS OWN SYSTEM OF SERVICE QUALITY
         CONTROL AND MEASUREMENT, WHICH MUST BE TRANSPARENT, TRUSTWORTHY AND OF
         EASY VERIFICATION BY "THE SECRETARIAT". THE SYSTEM MUST INCLUDE AT
         LEAST THE PARAMETERS RELATED TO THE GOALS AND STANDARDS OF QUALITY
         ESTABLISHED.

23a.     COMPLAINTS AND REPAIR SYSTEMS.

         "S.O.S." MUST ESTABLISH AN EFFICIENT SYSTEM OF RECEPTION OF COMPLAINTS
         AND REPAIR OF BREAKDOWNS OF "THE NETWORK", INFORMING ON A MONTHLY BASIS
         TO "THE SECRETARIAT" OF THE VOLUME OF COMPLAINTS, RESULT OF REPAIRS AND
         THE APPLICATION OF REFUNDS DERIVED FROM SERVICE INTERRUPTION AND OTHER
         COMPENSATIONS FOR NONFULFILLMENT OF QUALITY STANDARDS.

24a.     COMMERCIAL PRACTICES.

         "S.O.S." MUST SUPPLY THE USERS, FOR THE RELATIONSHIP BETWEEN THEM, WITH
         A COMMERCIAL PRACTICES CODE, WHICH WILL HAVE TO HAVE PREVIOUS APPROVAL
         BY "THE SECRETARIAT". THE CODE SHOULD SERVE AS A GUIDE FOR USERS AND
         EMPLOYEES OF "S.O.S." REGARDING ANY DISPUTE OR COMPLAINT RELATED TO THE
         PROVISION OF SERVICES. THIS CODE WILL BE REVIEWED EVERY 3 YEARS BY "THE
         SECRETARIAT".

         "S.O.S." MUST ATTEND TO MATTERS RELATED TO THE AUTHORIZED SERVICE, PUT
         FORTH BY USER ORGANIZATIONS RECOGNIZED BY "THE SECRETARIAT" OR ANY
         OTHER CONSULTATIVE BODY THAT "THE SECRETARIAT" ESTABLISHES.

         "S.O.S." MUST ASSURE THE CONFIDENTIALITY OF THE USER'S INFORMATION AND
         THAT IT WOULD NOT DIVULGE IT IF THERE IS NOT PREVIOUS CONSENTMENT, FOR
         ITS USE.

25a.     CONTRACT WITH USERS.

         "S.O.S." WILL ELABORATE A TYPE CONTRACT OF SERVICES WITH ITS USERS,
         THAT APPROVED BY "THE SECRETARIAT", MUST BE USED WHEN CONTRACTING THE
         SERVICES. THE MODIFICATIONS TO SAID CONTRACT MUST BE SUBMITTED FOR
         PREVIOUS APPROVAL BY "THE SECRETARIAT".

26a.     TELEPHONE DIRECTORY.

         "S.O.S." MUST PROVIDE SERVICES OF DIRECTORY INFORMATION BY TELEPHONE,
         EXCEPT IN THOSE CASES WHERE THE USER HAS REQUESTED NOT TO BE INCLUDED
         IN THE TELEPHONE DIRECTORY.

                                       8
<PAGE>   9
27a.     CONNECTION OF USER'S TERMINAL EQUIPMENT.

         "S.O.S." WILL HAVE TO CONNECT AND GIVE SERVICE TO ANY USER TERMINAL
         EQUIPMENT HOMOLOGATED BY "THE SECRETARIAT" AND MUST NOT OBLIGATE THE
         USER TO PURCHASE THE EQUIPMENT, NOR OTHER ASSETS OR SERVICES FROM IT,
         AS A CONDITION FOR PROVIDING THE REQUESTED SERVICE. "S.O.S." COULD DENY
         SERVICE ONLY IF THE EQUIPMENT WAS NOT HOMOLOGATED OR IF THE REQUESTER
         COULD NOT PROVE EQUIPMENT PROPERTY AND LEGAL DWELLING IN THIS COUNTRY.

28a.     "S.O.S."'S RESPONSIBILITY WITH THE USERS.

         "S.O.S." WILL BE THE ONLY RESPONSIBLE PARTY BEFORE "THE SECRETARIAT"
         FOR THE PROVISION OF SERVICES, FOR WHICH "THE SECRETARIAT" WILL BE
         RELIEVED OF ANY RESPONSIBILITY REGARDING THE USERS OF "S.O.S." IN THE
         EVENT THAT "S.O.S." DOES NOT RENDER THE SERVICES UNDER THE TERMS AND
         CONDITIONS ESTABLISHED IN THIS AUTHORIZATION, "THE SECRETARIAT" WILL
         APPLY THE PROCEEDING MEASURES.

                               IV. INTERCONNECTION

29a.     INTERCONNECTION WITH OTHER PUBLIC AND PRIVATE NETWORKS.

         "S.O.S." IS OBLIGATED TO INTERCONNECT "THE NETWORK" WITH OTHER NETWORKS
         AUTHORIZED BY "THE SECRETARIAT" THAT REQUEST INTERCONNECTION, AS WELL
         AS WITH INDEPENDENT NETWORKS FROM STATE OR PRIVATE ENTITIES UNDER THE
         AGREED TERMS. IN THE EVENT OF NOT REACHING AN AGREEMENT IN THE
         NEGOTIATION OF INTERCONNECTION, "THE SECRETARIAT" WILL RESOLVE THE
         MATTER. LIKEWISE, WHEN PUBLIC INTEREST DEMANDS IT, "S.O.S." IS
         OBLIGATED TO COMBINE ITS SERVICES WITH OTHER AUTHORIZED
         TELECOMMUNICATION SERVICES.

30a.     COMMUNICATION WITH USERS AT ANOTHER NETWORK'S REGION.

         "S.O.S." IS OBLIGATED TO EFFECT THE CORRESPONDING NEGOTIATIONS SO THAT
         USERS THAT REQUEST IT CAN UTILIZE THE MOBILE CELLULAR RADIOTELEPHONY
         SERVICES IN NETWORKS CONCESSIONED IN OTHER REGIONS. IN THE EVENT OF NOT
         REACHING AN AGREEMENT, "THE SECRETARIAT" WILL RESOLVE THE MATTER.

31a.     INTERCONNECTION REGULATIONS.

         "S.O.S." IS OBLIGATED TO EFFECT THE INTERCONNECTION OF ITS EQUIPMENT
         AND OF "THE NETWORK" WITH OTHER TELECOMMUNICATION NETWORKS, ACCORDING
         TO THE REGULATIONS ESTABLISHED BY "THE SECRETARIAT".

32a.     NETWORK INTERFERENCE.

         "S.O.S." SHOULD NOT AFFECT THE QUALITY NOR INTERFERE WITH THE PROVISION
         OF SERVICES FROM OTHER NETWORKS OR INTERCONNECTED EQUIPMENT.

                                       9
<PAGE>   10
33a.     TERMS OF INTERCONNECTION WITH PUBLIC NETWORKS.

         "S.O.S." WILL NEGOTIATE WITH OTHER CONCESSIONARIES OR LICENSEES OF
         CONVENTIONAL TELEPHONY NETWORKS OR CONDUCTION OF SIGNALS AUTHORIZED BY
         "THE SECRETARIAT", THE TERMS AND CONDITIONS FOR INTERCONNECTION OF "THE
         NETWORK" WITH THE RESPECTIVE NETWORKS.

         THE CONDITIONS OF INTERCONNECTION MUST CONTEMPLATE AMONG OTHER ASPECTS,
         THE METHOD THAT WILL BE ADOPTED TO MAKE OR MAINTAIN THE CONNECTION;
         CONNECTION POINTS; CONNECTION CAPACITY; FORM OF SIGNAL CONDUCTION
         BETWEEN BOTH NETWORKS; QUALITY OF CONDUCTION SIGNALS; ARRANGEMENTS MADE
         FOR THE CONDUCTION OF LONG DISTANCE NATIONAL AND INTERNATIONAL SIGNALS;
         TELECOMMUNICATION SERVICES AND INFORMATION REQUIRED TO ASSURE THAT THE
         CONNECTION POINTS BE MADE AND MAINTAINED; CONTINGENT OBLIGATIONS; DATES
         OR PERIODS IN WHICH TO EFFECT INTERCONNECTION; FEES AND OTHERS
         DETERMINED BY "THE SECRETARIAT" OF THE AGREEING PARTIES.

         IF AFTER TWO MONTHS OF REQUESTING INTERCONNECTION, THE RESPECTIVE
         CONCESSIONARY OR LICENSEE AND "S.O.S." DO NOT REACH AN AGREEMENT "THE
         SECRETARIAT" WILL DETERMINE THE TERMS AND CONDITIONS CONSIDERING THE
         INTERESTS OF BOTH PARTIES TO SECURE AMONG OTHER ASPECTS:

         A)          THAT THE COST OF INTERCONNECTION AND OTHER SERVICES WITH
                     "S.O.S." WILL REFLECT THE RENDERING COST AND WILL BE
                     INTERNATIONALLY COMPETITIVE.

         B)          THAT THE RESPECTIVE CONCESSIONARY OR LICENSEE, WILL BE
                     ADEQUATELY INDEMNIFIED FOR OBLIGATIONS TO THIRD PARTIES OR
                     DAMAGES AND LOSSES IN THEIR NETWORKS CAUSED BY "S.O.S."'S
                     NEGLIGENCE.

         C)          THAT THE QUALITY OF ALL SERVICES PROVIDED BY OTHER
                     INTERCONNECTED NETWORKS WILL NOT BE AFFECTED,

         D)          THAT THE CONNECTION ARRANGEMENTS BE MADE ACCORDING TO
                     ACCEPTED ENGINEERING PRINCIPLES AND PRACTICES.

         E)          THAT THE COMMERCIAL DEVELOPMENT OF THE CONCESSIONARY'S
                     NETWORK OR OF THE INTERCONNECTING LICENSEE IS NOT UNDULY
                     INHIBITED.

         F)          THAT THE CONNECTION POINTS ARE THOSE MOST CONVENIENT TO
                     BOTH PARTIES.

         G)          THAT "S.O.S." DOES NOT UNDULY DEPEND UPON THE SERVICES
                     PROVIDED BY THE RESPECTIVE CONCESSIONARY OR LICENSEE TO
                     COMPLY WITH THE OBLIGATIONS ESTABLISHED IN THIS
                     AUTHORIZATION.

                                       10
<PAGE>   11
         H)          THAT THE ARRANGEMENTS BE MADE UNDER SUCH CONDITIONS, AS
                     SIMILAR AS PRACTICALITY ALLOWS, TO THOSE OF OTHER MOBILE
                     CELLULAR RADIOTELEPHONY CONCESSIONARIES.

34a.      INTERCONNECTION WITH FOREIGN NETWORKS.

         IN THE EVENT THAT IT WOULD BE NECESSARY TO CONCERT WITH ANOTHER
         GOVERNMENT, THE CONNECTION OF "THE NETWORK", "S.O.S." WILL PRESENT
         BEFORE THE GOVERNMENT, THROUGH "THE SECRETARIAT", THE FORMALITIES
         NEEDED TO MAKE THE RESPECTIVE AGREEMENT. THE INTERCONNECTION CONTRACTS
         MADE WITH FOREIGN COMPANIES MUST BE PREVIOUSLY SANCTIONED BY "THE
         SECRETARIAT", WHICH WILL BE ABLE TO MODIFY THEM WHEN IT CONSIDERS THAT
         THEY HARM THE INTERESTS OF OTHER NETWORK OPERATORS, OF USERS OF THE
         AUTHORIZED SERVICE OR OF THE COUNTRY IN GENERAL.

                       V. RATES AND FINANCIAL EQUILIBRIUM

35a.     APPLICABLE RATES.

         "S.O.S." WILL SUBMIT FOR "THE SECRETARIAT'S" APPROVAL, THE MAXIMUM
         RATES OF RENDERED SERVICES, WHICH WILL HAVE TO BE COMPETITIVE AT AN
         INTERNATIONAL LEVEL. "S.O.S." WILL PRESENT BEFORE "THE SECRETARIAT",
         THE RATE SETTING STUDIES THAT SHOULD INCLUDE ADVANCES IN PRODUCTIVITY
         AND COST OF SERVICES.

         IF "THE SECRETARIAT" CONSIDERS THAT ENOUGH COMPETITION COULD BE
         GENERATED, IN ANY OF THE SERVICES RENDERED BY "S.O.S.", GREATER
         FLEXIBILITY IN RATE SETTING CONTROL COULD BE AUTHORIZED.

36a.     COST ACCOUNTING.

         "S.O.S" MUST EFFECT A COST ACCOUNTING AND SERVICE EARNINGS SYSTEM,
         WHICH IDENTIFIES ITS OPERATION.

37a.     PROHIBITION OF CROSSED SUBSIDIES.

         "S.O.S." WILL NOT BE ABLE TO RECEIVE SUBSIDY OR PRIVILEGED TREATMENT
         FROM ANY OTHER TELECOMMUNICATION SERVICE CONCESSIONARY, RESPECTING
         OTHER COMPANIES OR PUBLIC OR PRIVATE ENTITIES.

38a.      RATE PUBLICATION.

         "S.O.S." WILL HAVE TO PUBLISH IN THE FEDERATION'S OFFICIAL DIARY AND IN
         WIDE COVERAGE NEWSPAPERS, THE RATES, CONDITIONS AND CHARGES FOR
         SERVICES RENDERED.

39a.     PARTICIPATION OF EXPLOITATION EARNINGS.

         "S.O.S." IS OBLIGATED TO COVER TO THE FEDERAL GOVERNMENT AS
         PARTICIPATION IN ACCORDANCE WITH ARTICLE 110 OF THE GENERAL WAYS OF

                                       11
<PAGE>   12
         COMMUNICATION LAW, THE AMOUNT OF 12,500 MILLION PESOS IN REAL TERMS
         WITHIN THE FIRST YEAR OF CURRENCY OF THE PRESENT AUTHORIZATION AND 5%
         OF THE GROSS EARNINGS OF AUTHORIZED SERVICES. THIS AMOUNT WILL BE
         ADJUSTED UPON CONSIDERATION OF "THE SECRETARIAT", ACCORDING TO THE
         RESULTS OF CONCESSION GRANTING IN OTHER REGIONS DURING 1990.

         "S.O.S." MUST COVER EVERY SIX MONTHS, SAID EARNINGS PARTICIPATION,
         WITHIN THE FIRST MONTH AFTER THE SEMESTER IS CONCLUDED, IN NATIONAL
         CURRENCY AT THE OFFICES OF THE FEDERATION'S TREASURY AND IN DOCUMENT
         WRITTEN IN FAVOR OF IT.

         TO GUARANTEE THE PAYMENT OF 12,500 MILLION PESOS REFERRED TO IN THE
         ABOVE PARAGRAPH, "S.O.S." IS OBLIGATED TO DELIVER A BOND WHICH PROTECTS
         THE TOTAL AMOUNT, WITHIN THE FOLLOWING 30 WORKING DAYS AFTER THIS
         DOCUMENT'S DATE, DRAWN OUT BY AN AUTHORIZED BONDING INSTITUTION. THE
         POLICY ON WHICH THE BOND WILL BE DRAWN OUT, MUST CONTAIN THE EXPRESS
         STATEMENT THAT THE BONDING INSTITUTION ACCEPTS THAT WHICH IS PROVIDED
         BY ARTICLES 95 AND 118 OF THE CURRENT FEDERAL LAW OF BONDING
         INSTITUTIONS AND THE REMITTAL TO THE BENEFIT OF ORDER AND EXCUSSIO, IN
         ACCORDANCE WITH THE POLICY MODEL APPROVED BY THE FEDERATION'S TREASURY.

                            VI. GENERAL DISPOSITIONS.

40a.     INSPECTION, SUPERVISION AND INFORMATION.

         "THE SECRETARIAT" WILL HAVE AT ALL TIMES, THE FACULTY TO SUPERVISE AND
         INSPECT THE INSTALLATIONS AND SERVICES PROVIDED BY "S.O.S.", AND
         "S.O.S." IS OBLIGATED TO GRANT "THE SECRETARIAT" ALL OF THE FACILITIES
         THAT IT REQUIRES. "THE SECRETARIAT" WILL VERIFY WITH PERIODICAL
         INSPECTIONS, THE COMPLIANCE OF TECHNICAL AND ADMINISTRATIVE REGULATIONS
         AND OF COVERAGE, OPERATION AND QUALITY OF SERVICE COMMITMENTS.

41a.     TECHNICAL AND ADMINISTRATIVE INFORMATION.

         "S.O.S." IS OBLIGATED TO PROVIDE TO "THE SECRETARIAT", THE TECHNICAL,
         ADMINISTRATIVE AND FINANCIAL INFORMATION IN THE FORM AND UNDER THE
         TERMS THAT "THE SECRETARIAT" ESTABLISHES.

42a.     REAL RIGHTS.

         THE PRESENT AUTHORIZATION DOES NOT CREATE REAL RIGHTS IN FAVOR OF
         "S.O.S.", NOR IN FAVOR OF THIRD PARTIES, OVER THE ASSETS OF PUBLIC
         DOMAIN AFFECTED BY AUTHORIZED SERVICES; FOR WHICH ANY HOARDING OF GOODS
         REGARDING SUCH ASSETS IN THE RENDERING OF SERVICES BY "S.O.S.", WILL BE
         ENOUGH CAUSE TO REVOKE THE PRESENT AUTHORIZATION.

         "THE SECRETARIAT" HAS THE RIGHT TO GRANT ANOTHER OR OTHER CONCESSIONS
         IN FAVOR OF THIRD PARTIES FOR THE EXPLOITATION, WITHIN THE

                                       12
<PAGE>   13
         SAME GEOGRAPHICAL AREA OR IN A DIFFERENT ONE, OF IDENTICAL OR SIMILAR
         SERVICES WHICH ARE MATTER OF THIS AUTHORIZATION.

43a.     CESSION OF RIGHTS.

         "S.O.S." WILL NOT BE ABLE TO GRANT, TRANSFER, MORTGAGE, ASSESS OR
         EXPROPRIATE IN ANY WAY, NEITHER IN WHOLE NOR IN PART, THIS
         AUTHORIZATION OR THE RIGHTS DERIVED FROM IT, IN FAVOR OF THIRD PARTIES
         WITHOUT PREVIOUS APPROVAL FROM "THE SECRETARIAT".

         IN THE EVENT THAT "THE SECRETARIAT" GRANTS ITS CONSENT, THE RESPECTIVE
         CONTRACT OR AGREEMENT MUST COMPLY WITH THE LEGAL DISPOSITIONS
         APPLICABLE TO THIS MATTER.

44a.     MANDATE RESTRICTIONS.

         "S.O.S" WILL NOT BE ABLE, IN ANY EVENT, TO GRANT GENERAL MANDATE FOR
         LITIGATIONS AND COLLECTIONS, ADMINISTRATIVE ACTS AND ACTS OF DOMAIN
         WITH INDEFEASIBILITY, IN FAVOR OF SOCIETIES THAT DIRECTLY OR INDIRECTLY
         IMPLY THE DISPLACEMENT OF "S.O.S."'S RIGHTS AND OBLIGATIONS.

45a.     INTERVENTION OF FOREIGN GOVERNMENTS.

         "S.O.S." HAS ACCREDITED BEFORE "THE SECRETARIAT", THAT IT IS
         CONSTITUTED ACCORDING TO MEXICAN LAWS, AND THAT BECAUSE OF THIS, IT
         WILL NOT HAVE, REGARDING THE VALIDITY, INTERPRETATION OR COMPLIANCE OF
         THIS AUTHORIZATION, MORE RIGHTS OR RESOURCES THAN THOSE WHICH ARE
         GRANTED TO MEXICANS BY MEXICAN LAWS AND THEREFORE, IT MAKES A
         COMMITMENT NOT TO ASK FOR NOR ACCEPT, REGARDING THAT WHICH IS RELATIVE
         TO THE OPERATION AND EXPLOITATION OF THE SERVICES CONCESSIONED IN THIS
         AUTHORIZATION, THE DIPLOMATIC INTERVENTION OF A FOREIGN COUNTRY, NOR OF
         ANY PUBLIC OR PRIVATE INTERNATIONAL ORGANISM, WITHOUT LOSING IN BENEFIT
         OF THE MEXICAN NATION, ALL OF THE ASSETS AND RIGHTS IT WOULD HAVE
         ACQUIRED IN ORDER TO CONSTRUCT, ESTABLISH AND EXPLOIT THE WAY OF
         COMMUNICATION AND AUTHORIZED SERVICES.

46a.. THE NON-GRANTING OF RIGHTS TO FOREIGNERS.

         "S.O.S." WILL NOT BE ABLE, IN ANY EVENT, TO DIRECTLY OR INDIRECTLY
         GRANT, MORTGAGE, NOR IN ANY WAY ASSESS OR EXPROPRIATE THE PRESENT
         AUTHORIZATION, THE RIGHTS GRANTED BY IT, THE CONSTRUCTIONS AND
         INSTALLATIONS, SHARES, OBLIGATIONS OR EMITTED BONDS, TO ANY GOVERNMENT
         OR FOREIGN STATE, NOR ADMIT THEM AS PARTNERS OF "S.O.S."; ANY OPERATION
         MADE AGAINST WHAT IS SET FORTH IN THIS CONDITION WILL HAVE FULL RIGHTS
         ANNULLED.

         LIKEWISE, IF ANY GOVERNMENT OR FOREIGN STATE ACQUIRES SHARES,
         OBLIGATIONS OR BONDS EMITTED BY "S.O.S.", IT WILL LACK EFFECT AND VALUE
         FOR THE KEEPER AS OF THE MOMENT OF ITS ACQUISITION.

                                       13
<PAGE>   14
47a.     SOCIAL CAPITAL.

         "S.O.S." IS OBLIGATED TO PRESENT BEFORE "THE SECRETARIAT", EVERY SIX
         MONTHS, THE MODIFICATIONS TO ITS CONSTITUTIVE WRITING, RELATIVE, AMONG
         OTHERS, TO THE INCREASES AND INTEGRATION OF ITS SOCIAL CAPITAL
         INDICATING THE REPRESENTATION OF FOREIGN INVESTMENT THAT WILL NOT IN
         ANY CASE EXCEED 49% OF THE TOTAL AMOUNT.

                   VII. CURRENCY, TERMINATION AND REVOKEMENT.

48a.     CURRENCY.

         THE PRESENT AUTHORIZATION FORMS AN INTEGRATING PART OF THE CONCESSION
         DATED APRIL 1, 1957 GRANTED TO "S.O.S." AND WILL BE CURRENT DURING THE
         TERM ESTABLISHED IN IT.

         EACH AND EVERY ONE OF THE CONDITIONS SET FORTH IN THE CONCESSION TITLE
         GRANTED TO "S.O.S." DATED APRIL 1, 1957 AND OTHER AUTHORIZATIONS
         GRANTED TO THE COMPANY, SUBSIST IN THEIR TERMS UNLESS THEY ARE OPPOSED
         TO WHAT IS ESTABLISHED IN THIS AUTHORIZATION.

         THE CONDITIONS ESTABLISHED IN THE PRESENT AUTHORIZATION MUST BE
         REVIEWED EVERY 5 YEARS, REGARDING EXPANSION, MODERNIZATION, OPERATION
         AND QUALITY OF SERVICE CLAUSES.

49a.     CAUSES FOR REVOKEMENT.

         "THE SECRETARIAT" WILL BE ABLE TO REVOKE THIS AUTHORIZATION, FOR ANY OF
         THE CAUSES CONSIDERED IN ARTICLE 29 OF THE GENERAL WAYS OF
         COMMUNICATION LAW, IN ADDITION TO THE FOLLOWING ONES:

         I.          FOR NOT RENDERING WITH EFFICIENCY AND REGULARITY THE
                     SERVICES SUBJECT OF THIS AUTHORIZATION, NOTWITHSTANDING THE
                     ADMONITION THAT FOR THIS MATTER "THE SECRETARIAT" WILL MAKE
                     IN WRITING.

         II.         FOR TOTAL OR REGIONAL SUSPENSION OF SERVICES WITHOUT
                     PREVIOUS APPROVAL BY "THE SECRETARIAT" AND WITHOUT
                     JUSTIFIED CAUSE.

         III.        FOR SUBSTANTIAL MODIFICATIONS, OR ALTERATIONS TO AUTHORIZED
                     INSTALLATIONS OR CONDITIONS UNDER WHICH THE SERVICES
                     OPERATE, WITHOUT PREVIOUS APPROVAL BY "THE SECRETARIAT".

         IV.         FOR NOT COVERING THE EARNINGS PARTICIPATION TO THE STATE.

         V.          FOR SERIOUS AND REITERATED VIOLATIONS TO THE OBLIGATIONS
                     IMPOSED IN THIS AUTHORIZATION, PREVIOUS ADMONITION THAT
                     "THE SECRETARIAT" WILL MAKE IN WRITING.

                                       14
<PAGE>   15
         VI.         FOR BEING UNWILLING TO INTERCONNECT WITH OTHER
                     CONCESSIONARIES OR LICENSEES OF TELECOMMUNICATION SERVICES
                     WITHOUT JUSTIFIED CAUSE.

         VII.        FOR MODIFYING THE INTEGRATION OF SOCIAL CAPITAL THAT WOULD
                     ALLOW PARTICIPATION OF FOREIGN CAPITAL IN MORE THAN 49%.

         VIII.       FOR RENDERING TELECOMMUNICATION SERVICES NOT CONTAINED IN
                     THIS AUTHORIZATION, WITHOUT PREVIOUS AUTHORIZATION BY "THE
                     SECRETARIAT".

         IX.         FOR HIDING INFORMATION OR BEING UNWILLING TO PROVIDE
                     INFORMATION TO "THE SECRETARIAT" WITHOUT JUSTIFIED CAUSE.

         X.          FOR GRANTING, EXPROPRIATING OR IN ANY WAY ASSESSING THE
                     ASSETS NECESSARY FOR PUBLIC SERVICE WITHOUT PREVIOUS
                     AUTHORIZATION BY "THE SECRETARIAT".

         XI.         FOR BANKRUPTCY DECLARED BY JUDICIAL RESOLUTION.

         THE REVOKEMENT OF THIS AUTHORIZATION WILL PROCEED ACCORDING TO THE
         PROCEDURE ESTABLISHED BY ARTICLE 34 OF THE LAW OF MATTER.

50a.     REDUCTION OF THE AUTHORIZATION'S AMBIT.

         THE AUTHORIZATION'S AMBIT FOR A REGION OR SPECIFIC SERVICE WILL BE
         REDUCED IN THE EVENT OF THE HAPPENING OF CAUSES INDICATED IN THE
         PRECEDING CONDITION 49a IN REGARD TO SAID REGION OR SPECIFIC SERVICE.

51a.     GUARANTEE.

         TO GUARANTEE THE FULFILLMENT OF THE OBLIGATIONS IMPOSED IN THIS
         AUTHORIZATION, THE "S.O.S." COMPANY WILL ESTABLISH A BOND WITH AN
         AUTHORIZED COMPANY FOR 1,500 MILLION PESOS IN FAVOR OF THE FEDERATION'S
         TREASURY. THIS GUARANTEE WILL HAVE CURRENCY FOR THE SAME TERM AS THIS
         AUTHORIZATION AND "S.O.S." IS OBLIGATED TO INCREASE IT WITHIN NO MORE
         THAN A 10 WORKING DAY PERIOD WHEN "THE SECRETARIAT" CONSIDERS IT
         NECESSARY.

         THE POLICY ON WHICH THE BOND WILL BE DRAWN OUT, MUST CONTAIN THE
         EXPRESS STATEMENT THAT THE BONDING INSTITUTION ACCEPTS THAT WHICH IS
         PROVIDED BY ARTICLES 95 AND 118 OF THE CURRENT FEDERAL LAW OF BONDING
         INSTITUTIONS AND THE REMITTAL TO THE BENEFIT OF ORDER AND EXCUSSIO, IN
         ACCORDANCE WITH THE POLICY MODEL APPROVED BY THE FEDERATION'S TREASURY.

                                       15
<PAGE>   16
52a.     SANCTIONS.

         THE ADMINISTRATIVE SANCTIONS WILL BE IMPOSED BY "THE SECRETARIAT", IN
         ACCORDANCE WITH THE APPLICABLE LEGISLATION.

IN MEXICO CITY ON THE THIRD DAY OF THE MONTH OF OCTOBER OF NINETEEN NINETY ONE.

         THE COMMUNICATION AND                    SERVICIO ORGANIZADO
          TRANSPORT SECRETARY                       SECRETARIAL, S.A.

Signature. (Illegible).                 Signature. (Illegible).

ANDRES CASO LOMBARDO                    ING. CARLOS PERALTA QUINTERO VICE
                                        PRESIDENT OF THE ADMINISTRATION COUNCIL.

                                       16
<PAGE>   17
                              The undersigned, WILLY DE WINTER, Ave.
                              Horacio 528-404, Mexico 5, D. F., sworn
                              translator before the Superior Court of
                              Justice of the Federal District, for the
                              Spanish and English languages, certifies
                              that the above is a true and exact
                              translation of the document attached.

                                         Mexico City, September 19, 1991.
                                         /s/     WILLY DE WINTER
                                                 WILLY DE WINTER

                                       17

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