TWELFTH SUPPLEMENTAL INDENTURE Dated as of October 30, 2007

Exhibit 99.2

EXECUTION COPY

América Móvil, S.A.B. d e C.V.,

                                                                     as Issuer

and

Radiomóvil Dipsa, S.A. de C.V.,

                                                                             as Guarantor

to

The Bank of New York

(as successor to JPMorgan Chase Bank, N.A.),

                                                                     as Trustee

TWELFTH SUPPLEMENTAL INDENTURE

Dated as of October 30, 2007

U.S.$400,000,000

6.125% Senior Notes due 2037

TABLE OF CONTENTS

				Page
ARTICLE ONE DEFINITIONS				1
Section 101.		Provisions of the Base Indenture		1
Section 102.		Definitions		2
ARTICLE TWO GENERAL TERMS AND CONDITIONS OF THE NOTES				3
Section 201.		Designation and Principal Amount		3
Section 202.		Forms Generally		3
Section 203.		Form of Trustee’s Certificate of Authentification		13
Section 204.		Maintenance of Office or Agency		13
Section 205.		EuroMTF Listing		14
ARTICLE THREE MISCELLANEOUS PROVISIONS				14
Section 301.		Separability of Invalid Provisions		14
Section 302.		Execution in Counterparts		14
Section 303.		Certain Matters		14

TWELFTH SUPPLEMENTAL INDENTURE, dated as of October 30, 2007, among América Móvil, S.A.B. de C.V., a sociedad anónima bursátil de capital variable organized and existing under the laws of the United Mexican States (“Mexico”) (herein called the “Company”), having its principal office at Xxxx Xxxxxxx 366, Edificio Telcel I, Piso 0, Xxxxxxx Xxxxxxx, 00000, Xxxxxx, D.F., Mexico, Radiomóvil Dipsa, S.A. de C.V., a sociedad anónima de capital variable organized and existing under the laws of Mexico (herein called the “Guarantor”), having its principal office at Xxxx Xxxxxxx 366, Edificio Telcel I, Piso 0, Xxxxxxx Xxxxxxx, 00000, Xxxxxx, D.F., Mexico, and The Bank of New York (as successor to JPMorgan Chase Bank, N.A.), a banking corporation duly organized and existing under the laws of the State of New York, as Trustee (herein called the “Trustee”), to the Indenture, dated as of March 9, 2004, (as supplemented by the Fifth Supplemental Indenture, dated as of December 14, 2004, and the Eighth Supplemental Indenture, dated as of September 29, 2006, among the Company, the Guarantor and the Trustee, herein called the “Base Indenture”).

W I T N E S S E T H:

WHEREAS, the Base Indenture provides, in Section 301 thereof, for the issuance from time to time thereunder, in series, of debt Securities of the Company, and Section 901 of the Base Indenture provides for the establishment of the form or terms of Securities issued thereunder through one or more supplemental indentures;

WHEREAS, the Company desires by this Twelfth Supplemental Indenture to create a series of Securities to be issuable under the Base Indenture, as supplemented by this Twelfth Supplemental Indenture, and to be known as the Company’s “6.125% Senior Notes due 2037” (the “Notes”), which are to be initially limited in aggregate principal amount as specified in this Twelfth Supplemental Indenture and the terms and provisions of which are to be as specified in this Twelfth Supplemental Indenture;

WHEREAS, the Company has duly authorized the execution and delivery of this Twelfth Supplemental Indenture to establish the Notes as a series of Securities under the Base Indenture and to provide for, among other things, the issuance of and the form and terms of the Notes and additional covenants for purposes of the Notes and the Holders thereof;

WHEREAS, the Guarantor has duly authorized the execution and delivery of this Twelfth Supplemental Indenture to provide for the Guarantees of the Notes; and

WHEREAS, all things necessary to make this Twelfth Supplemental Indenture a valid agreement of the Company and the Guarantor, in accordance with its terms, have been done.

NOW, THEREFORE, for and in consideration of the premises and the purchase and acceptance of the Notes by the Holders thereof and for the purpose of setting forth, as provided in the Base Indenture, the form of the Notes and the terms, provisions and conditions thereof, the Company and the Guarantor covenant and agree with the Trustee as follows:

ARTICLE ONE

DEFINITIONS

Section 101. Provisions of the Base Indenture.

Except insofar as herein otherwise expressly provided, all the definitions, provisions, terms and conditions of the Base Indenture shall remain in full force and effect. The Base Indenture, as supplemented by this Twelfth Supplemental Indenture, is in

all respects ratified and confirmed, and the Base Indenture and this Twelfth Supplemental Indenture shall be read, taken and considered as one and the same instrument for all purposes and every Holder of Notes authenticated and delivered under this Twelfth Supplemental Indenture shall be bound hereby.

Section 102. Definitions.

For all purposes of this Twelfth Supplemental Indenture and the Notes, except as otherwise expressly provided or unless the subject matter or context otherwise requires:

(a) unless the context otherwise requires, any reference to an “Article” or a “Section” refers to an Article or Section, as the case may be, of this Twelfth Supplemental Indenture;

(b) the words “herein”, “hereof” and “hereunder” and other words of similar import refer to this Twelfth Supplemental Indenture as a whole and not to any particular Article, Section or other subdivision;

(c) all terms used in this Twelfth Supplemental Indenture that are defined in the Base Indenture have the meanings assigned to them in the Base Indenture, except as otherwise provided in this Twelfth Supplemental Indenture;

(d) the term “Securities” as defined in the Base Indenture and as used in any definition therein, shall be deemed to include or refer to, as applicable, the Notes; and

(e) the following terms have the meanings given to them in this Section 102(e).

“Applicable Procedures” means, with respect to any transfer or transaction involving a Global Note or beneficial interest therein, the rules and procedures of the Depositary, Euroclear and Clearstream for such Global Note, in each case to the extent applicable to such transaction and as in effect from time to time.

“Global Note” means a Note that evidences all or part of the Notes and is authenticated and delivered to, and registered in the name of, the Depositary for such Notes or a nominee thereof.

“Permitted Holder” means, at any time, any Person who, at such time, is the Holder of at least U.S.$5,000,000 in aggregate principal amount of Notes.

“Predecessor Note” means, with respect to any particular Note, every previous Note evidencing all or a portion of the same debt as that evidenced by such particular Note; and, for the purposes of this definition, any Note authenticated and delivered under Section 305 of the Base Indenture in exchange for or in lieu of a mutilated, destroyed, lost or stolen Note shall be deemed to evidence the same debt as the mutilated, destroyed, lost or stolen Note.

ARTICLE TWO

GENERAL TERMS AND CONDITIONS OF THE NOTES

Section 201. Designation, Principal Amount and Interest Rate.

There is hereby authorized and established a series of Securities designated the “6.125% Senior Notes due 2037” (the “Notes”), initially in an aggregate principal amount of U.S.$400,000,000 (which amount does not include Notes authenticated and delivered upon registration of transfer of, in exchange for, or in lieu of, other Securities of such series pursuant to Sections 304, 305, 306, 906 or 1205 of the Base Indenture), which amount shall be specified in the Company Order for the authentication and delivery of Notes pursuant to Section 303 of the Base Indenture. The principal of the Notes shall be due and payable at their Stated Maturity.

The Company may, from time to time and without the consent of the Holders, issue additional notes, with Guarantees of the Guarantor duly annexed thereto or endorsed thereon, on terms and conditions identical to those of the Notes (except for issue date, issue price and the date from which interest shall accrue and, if applicable, first be paid), which additional notes, together with Guarantees of the Guarantor duly annexed thereto or endorsed thereon, shall increase the aggregate principal amount of, and shall be consolidated and form a single series with, the Notes.

The Stated Maturity of the Notes shall be November 15, 2037. The Notes shall bear interest at the rate of 6.125% per annum, from October 30, 2007 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, as the case may be, payable semi-annually on May 15 and November 15, commencing on May 15, 2008, until the principal thereof is paid or made available for payment; provided, however, that any amount of interest on any Note which is overdue shall bear interest (to the extent that payment thereof shall be legally enforceable) at the rate per annum then borne by such Note from the date such amount is due to the day it is paid or made available for payment, and such overdue interest shall be paid as provided in Section 306 of the Base Indenture.

Section 202. Forms Generally.

The Notes and the Guarantees annexed thereto or endorsed thereon shall be in substantially the forms set forth in this Section 202, with such appropriate insertions, omissions, substitutions and other variations as are required or permitted by this Twelfth Supplemental Indenture, and may have such letters, numbers or other marks of identification and such legends or endorsements placed thereon as may be required to comply with the rules of any securities exchange or as may, consistently herewith, be determined by the officers executing such Notes, as evidenced by their execution thereof, with Guarantees duly annexed thereto or endorsed thereon.

Upon their original issuance, the Notes shall be issued in the form of one or more Global Notes in definitive, fully registered form, with Guarantees annexed thereto or endorsed thereon, without coupons, substantially in the form set forth in this Section 202. Such Global Notes shall be registered in the name of the Depositary, or its nominee, and deposited with the Trustee, at its Corporate Trust Office, as custodian for the Depositary, duly executed by the Company, with Guarantees duly annexed thereto or endorsed thereon, and authenticated by the Trustee as hereinafter provided. The aggregate amount of any Global Notes may from time to time be increased or decreased by adjustments made on the records of the Trustee, as custodian for the Depositary, as provided in Section 203 hereof.

(a) Form of Face of Note.

[INCLUDE IF NOTE IS A GLOBAL NOTE—THIS IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO, AS SUPPLEMENTED BY THE TWELFTH SUPPLEMENTAL INDENTURE HEREINAFTER REFERRED TO, AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY, WHICH MAY BE TREATED BY AMÉRICA MÓVIL, S.A.B. DE C.V., THE TRUSTEE AND ANY AGENT THEREOF AS OWNER AND HOLDER OF THIS NOTE FOR ALL PURPOSES.]

[INCLUDE IF NOTE IS A GLOBAL NOTE AND THE DEPOSITARY IS THE DEPOSITORY TRUST COMPANY—UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY TO AMÉRICA MÓVIL, S.A.B. DE C.V. OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IN EXCHANGE FOR THIS CERTIFICATE OR ANY PORTION HEREOF IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON OTHER THAN THE DEPOSITORY TRUST COMPANY OR A NOMINEE THEREOF IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THIS GLOBAL NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.]

AMÉRICA MÓVIL, S.A.B. DE C.V.

6.125% SENIOR NOTES DUE 2037

CUSIP Number: 02364W AP0 / ISIN Number: US02364WAP05

No. U.S.$

América Móvil, S.A.B. de C.V. (herein called the “Company”, which term includes any successor Person under the Indenture hereinafter referred to, as supplemented by the Twelfth Supplemental Indenture hereinafter referred to), a sociedad anónima bursátil de capital variable organized and existing under the laws of the United Mexican States (“Mexico”), for value received, hereby promises to pay to                     , or registered assigns, the principal sum of                     Dollars [if the Note is a Global Note, then insert—or such other principal amount (which, when taken together with the principal amounts of all other Outstanding Notes, shall initially equal U.S.$400,000,000 in the aggregate]; provided, however, that the Company may from time to time or at any time, without the consent of the Holders of the Notes, issue additional notes, with Guarantees of the Guarantor duly annexed thereto or endorsed thereon, with terms and conditions identical to those of the Notes, which additional notes, together with Guarantees of the Guarantor duly annexed thereto or endorsed thereon, shall increase the aggregate principal amount of, and shall be consolidated and form a single series with, the Notes) as may be set forth in the records of the Trustee hereinafter referred to in accordance with the Indenture (as supplemented by the Twelfth Supplemental Indenture), on November 15, 2037 (unless earlier

redeemed, in which case, on the applicable Redemption Date) and to pay interest thereon from October 30, 2007 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, as the case may be, semi-annually on May 15 and November 15 in each year, commencing on May 15, 2008 at the rate of 6.125% per annum, until the principal hereof is paid or made available for payment, provided that any amount of interest on this Note which is overdue shall bear interest (to the extent that payment thereof shall be legally enforceable) at the rate per annum then borne by this Note from the date such amount is due to but not including the day it is paid or made available for payment, and such overdue interest shall be paid as provided in Section 306 of the Indenture.

The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date shall, as provided in such Indenture and the Twelfth Supplemental Indenture, be paid to the Person in whose name this Note (or one or more Predecessor Notes) is registered at the close of business on the Regular Record Date for such interest, which shall be May 1 and November 1 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Any such interest not so punctually paid or duly provided for shall forthwith cease to be payable to the Holder on the relevant Regular Record Date and may either be paid to the Person in whose name this Note (or one or more Predecessor Notes) is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to Holders of the Note not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Note may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture, as supplemented by the Twelfth Supplemental Indenture. Interest on this Note shall be computed on the basis set forth in the Indenture, as supplemented by the Twelfth Supplemental Indenture.

Payment of the principal of and interest on this Note shall be made at the office of the Trustee or agency of the Company in the Borough of Manhattan, New York City, New York and, if and for so long as the Notes are admitted to listing on the Official List of the Luxembourg Stock Exchange and trading on the EuroMTF, at the office of the Paying Agent in Luxembourg, in each case maintained for such purpose and at any other office or agency maintained by the Company for such purpose, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts against surrender of this Note in the case of any payment due at the Maturity of the principal thereof (other than any payment of interest that first becomes payable on a day other than an Interest Payment Date); provided, however, that at the option of the Company payment of interest may be made by check mailed to the address of the Person entitled thereto as such address shall appear in the Securities Register; and provided, further, that all payments of the principal of and interest on this Note, the Permitted Holders of which have given wire transfer instructions to the Trustee, the Company, or its agent at least 10 Business Days prior to the applicable payment date, shall be required to be made by wire transfer of immediately available funds to the accounts specified by such Permitted Holders in such instructions. [If the Note is a Global Note, then insert—Notwithstanding the foregoing, payment of any amount payable in respect of a Global Note shall be made in accordance with the Applicable Procedures of the Depositary.]

Reference is hereby made to the further provisions of this Note set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place.

Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Note shall not be entitled to any benefit under the Indenture and Twelfth Supplemental Indenture or be valid or obligatory for any purpose.

IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its corporate seal.

Dated:

AMÉRICA MÓVIL, S.A.B. DE C.V.

By:

Name:

Title:

By:

Name:

Title:

(b) Form of Reverse of Note.

This Note is a duly authorized issue of securities of the Company (herein collectively called the “Notes”), issued under an Indenture, dated as of March 9, 2004 and as previously supplemented by the Fifth Supplemental Indenture, dated as of December 14, 2004 and the Eighth Supplemental Indenture, dated as of September 29, 2006 (herein called the “Indenture”, which term shall have the meaning assigned to it in such instrument), as further supplemented by the Twelfth Supplemental Indenture dated as of October 30, 2007 (the “Twelfth Supplemental Indenture”), among the Company, Radiomóvil Dipsa, S.A. de C.V., a sociedad anónima de capital variable organized and existing under the laws of Mexico (herein called the “Guarantor,” which term includes any successor Person under the Indenture) and The Bank of New York (as successor to JPMorgan Chase Bank, N.A.), as Trustee (herein called the “Trustee”, which term includes any successor trustee under the Indenture), and reference is hereby made to the Indenture, as supplemented by the Twelfth Supplemental Indenture, for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Guarantor, the Trustee and the Holders of the Notes and of the terms upon which the Notes are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof.

Additional notes on terms and conditions identical to those of this Note (except for issue date, issue price and the date from which interest shall accrue and, if applicable, first be paid) may be issued by the Company without the consent of the Holders of the Notes. The amount evidenced by such additional Notes shall increase the aggregate principal amount of, and shall be consolidated and form a single series with, the Notes.

In the event of redemption of this Note in part only, a new Note of this series and of like tenor for the unredeemed portion hereof shall be issued in the name of the Holder hereof upon the cancellation hereof.

If an Event of Default with respect to Notes shall occur and be continuing, the principal of all of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture, as supplemented by the Twelfth Supplemental Indenture.

All payments of principal and interest in respect of the Notes shall be made after withholding or deduction for any present or future taxes, duties, assessments or governmental charges of whatever nature imposed, levied, collected, withheld or assessed by or on behalf of Mexico or any authority therein or thereof having power to tax (“Mexican Taxes”). In the event of any withholding or deduction for any Mexican Taxes, the Company shall pay such additional amounts (“Additional Amounts”) as will result in receipt by the Holders of Notes on the respective due dates of such amounts as would have been received by them had no such withholding or deduction (including for any Mexican Taxes payable in respect of Additional Amounts) been required, except that no such Additional Amounts shall be payable with respect to any payment on a Note to the extent:

(i) that any such taxes, duties, assessments or other governmental charges would not have been imposed but for (A) a connection between the Holder and Mexico other than the ownership or holding of such Note and the mere receipt of payments with respect to such Note or (B) failure by the Holder or any other Person to comply with any certification, identification or other reporting requirement concerning the nationality, residence, identity or connection with Mexico of the Holder or any beneficial owner of such Note if compliance is required by law, regulation or by an applicable income tax treaty to which Mexico is a party, as a precondition to exemption from, or reduction in the rate of, the tax, assessment or other governmental charge and we have given the Holders at least 30 days’ notice prior to the first payment date with respect to which such certification, identification or reporting requirement is required to the effect that Holders will be required to provide such information and identification;

(ii) of any such taxes, duties, assessments or other governmental charges with respect to a Note presented for payment more than 15 days after the date on which such payment became due and payable or the date on which payment thereof is duly provided for and notice thereof given to Holders, whichever occurs later, except to the extent that the Holder of such Note would have been entitled to such Additional Amounts on presenting such Note for payment on any date during such 15-day period;

(iii) of estate, inheritance, gift or other similar taxes, assessments or other governmental charge imposed with respect to a Note;

(iv) any tax, duty, assessment or other governmental charge payable otherwise than by deduction or withholding from payments on any series of Notes; and

(v) any payment on a Note to a Holder who is a fiduciary or partnership or a person other than the sole beneficial owner of any such payment, to the extent that a beneficiary or settlor with respect to such fiduciary, a member of such a partnership or the beneficial owner of such payment would not have been entitled to the Additional Amounts had such beneficiary, settlor, member or beneficial owner been the Holder of such Note.

For purposes of the provisions described in Clause (i) above, the term “Holder” of any Note means the direct nominee of any beneficial owner of such Note, which holds such beneficial owner’s interest in such Note. Notwithstanding the foregoing, the limitations on the Company’s obligation to pay Additional Amounts set forth in Clause (i)(B) above shall not apply if (a) the provision of information, documentation or other evidence described in such Clause (i)(B) would be materially more onerous, in form, in procedure or in the substance of information disclosed, to a Holder or beneficial owner of a Note (taking into account any relevant differences between U.S. and Mexican law, regulation or administrative practice) than comparable information or other reporting requirements imposed under U.S. tax law (including the United States—Mexico Income Tax Treaty), regulations (including

proposed regulations) and administrative practice or (b) Rule 3.25.15 is in effect, unless the provision of the information, documentation or other evidence described in such Clause (i)(B) is expressly required by statute, regulation, rule or administrative practice in order to apply Rule 3.25.15 and the Company cannot obtain such information, documentation or other evidence on its own through reasonable diligence and the Company otherwise would meet the requirements for application of Rule 3.25.15. In addition, such Clause (i)(B) shall not be construed to require that a non-Mexican pension or retirement fund or a non-Mexican financial institution or any other Person register with the Ministry of Finance and Public Credit for the purpose of establishing eligibility for an exemption from or reduction of Mexican withholding tax.

The Company shall provide the Trustee with the xxxxxxxxxx or other relevant documentation, if any, (which may consist of certified copies of such documentation) satisfactory to the Trustee evidencing the payment of Mexican Taxes in respect of which the Company has paid any Additional Amounts. Copies of such documentation shall be made available to the Holders of the Notes or the Paying Agent, as applicable, upon request therefor.

The Company shall pay all stamp, issue, registration, documentary or other similar duties, if any, which may be imposed by Mexico or any governmental entity or political subdivision therein or thereof, or any taxing authority of or in any of the foregoing, with respect to the Indenture or the Twelfth Supplemental Indenture or the issuance of the Notes.

All references herein, in the Indenture, the Twelfth Supplemental Indenture, the Notes or the Guarantees, to principal, premium, if any, or interest or any other amount payable in respect of any Note shall be deemed to include all Additional Amounts, if any, payable in respect of such principal, premium, interest or other amount payable, unless the context otherwise requires, and express mention of the payment of Additional Amounts in any provision hereof shall not be construed as excluding reference to Additional Amounts in those provisions hereof where such express mention is not made.

In the event that Additional Amounts actually paid with respect to the Notes pursuant to the preceding paragraphs are based on rates of deduction or withholding of withholding taxes in excess of the appropriate rate applicable to the Holder of such Notes, and, as a result thereof such Holder is entitled to make claim for a refund or credit of such excess from the authority imposing such withholding tax, then such Holder shall, by accepting such Notes, be deemed to have assigned and transferred all right, title, and interest to any such claim for a refund or credit of such excess to the Company. However, by making such assignment, the Holder makes no representation or warranty that the Company shall be entitled to receive such claim for a refund or credit and incurs no other obligation with respect thereto.

All references in the Indenture, the Twelfth Supplemental Indenture, the Notes and the Guarantees to principal in respect of any Note shall be deemed to mean and include any Redemption Price payable in respect of such Note pursuant to any redemption or repurchase right hereunder (and all such references to the Stated Maturity of the principal in respect of any Note shall be deemed to mean and include the Redemption Date with respect to any such Redemption Price), and all such references to principal, premium, interest or Additional Amounts shall be deemed to mean and include any amount payable in respect hereof pursuant to Section 1010 of the Indenture.

The Notes are subject to redemption upon not less than 30 nor more than 60 days’ notice by mail, at any time:

(i) as a whole but not in part, at the election of the Company, at a cash price equal to the sum of (A) the principal amount of the Notes being redeemed, (B) accrued and unpaid current interest thereon to but not including the date fixed for redemption,

and (C) any Additional Amounts which would otherwise be payable up to but not including the date fixed for redemption, solely if, as a result of any amendment to, or change in, the laws (or any laws, rules, or regulations thereunder) of Mexico or any political subdivision or taxing authority thereof or therein affecting taxation or any amendment to or change in an official interpretation, administration or application of such laws, rules, or regulations (including a holding by a court of competent jurisdiction), which amendment or change of such laws, rules, or regulations becomes effective after October 24, 2007, the Company would be obligated, after making reasonable endeavors to avoid such requirement, to pay Additional Amounts in excess of the Additional Amounts that the Company would be obligated to pay if payments made on the Notes were subject to withholding or deduction of Mexican Taxes at the rate of 4.9%; and

(ii) in whole or in part, at a Redemption Price equal to the greater of (A) 100% of the principal amount of such Notes and (B) the sum of the present values of the remaining scheduled payments of principal and interest thereon (exclusive of interest accrued to the date of redemption) discounted to the Redemption Date on a semiannual basis (assuming a 360-day year consisting of twelve 30-day months) at, in each case, the Treasury Rate plus 25 basis points, plus, in the case of (A) and (B), accrued interest on the principal amount of such Notes to (but not including) the date of redemption.

For purposes of clause (ii) above, the following terms shall have the specified meanings:

“Treasury Rate” means, with respect to any Redemption Date, the rate per annum equal to the semiannual equivalent yield to maturity or interpolated maturity (on a day count basis) of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Redemption Date.

“Comparable Treasury Issue” means the United States Treasury security or securities selected by an Independent Investment Banker as having an actual or interpolated maturity comparable to the remaining term of the Notes to be redeemed that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of a comparable maturity to the remaining term of such notes.

“Independent Investment Banker” means one of the Reference Treasury Dealers appointed by the Company.

“Comparable Treasury Price” means, with respect to any Redemption Date, (x) the average of the Reference Treasury Dealer Quotations for such Redemption Date, after excluding the highest and lowest such Reference Treasury Dealer Quotation or (y) if the Trustee obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such quotations.

“Reference Treasury Dealer” means Credit Suisse Securities (USA) LLC, Xxxxxxx, Sachs & Co., or their respective Affiliates which are primary United States government securities dealers and two other leading primary United States government securities dealers in New York City reasonably designated by the Company; provided, however, that if any of the foregoing shall cease to be a primary United States government securities dealer in New York City (a “Primary Treasury Dealer”), the Company shall substitute therefor another Primary Treasury Dealer.

“Reference Treasury Dealer Quotation” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Trustee by such Reference Treasury Dealer at 3:30 pm New York time on the third Business Day preceding such Redemption Date.

The Indenture, as supplemented by the Twelfth Supplemental Indenture, permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the Guarantor, on the one hand, and the rights of the Holders of the Notes, on the other hand, at any time by the Company, the Guarantor and the Trustee with the consent of the Holders of a majority in principal amount of the Notes at the time Outstanding. The Indenture also contains provisions (i) permitting the Holders of a majority in principal amount of the Notes at the time Outstanding, on behalf of the Holders of all Notes, to waive compliance by the Company with certain provisions of the Indenture, as supplemented by the Twelfth Supplemental Indenture, and (ii) permitting the Holders of a majority in principal amount of the Notes at the time Outstanding, on behalf of the Holders of all Notes, to waive certain past defaults under the Indenture, as supplemented by the Twelfth Supplemental Indenture, and their consequences. Any such consent or waiver by the Holder of this Note shall be conclusive and binding upon such Holder and upon all future Holders of this Note and of any Note issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.

As provided in and subject to the provisions of the Indenture, as supplemented by the Twelfth Supplemental Indenture, the Holder of this Note shall not have the right to institute any proceeding with respect to the Indenture or the Twelfth Supplemental Indenture, or for the appointment of a receiver or trustee, or for any other remedy thereunder, unless such Holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Notes, the Holders of not less than 25% in principal amount of the Notes at the time Outstanding shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee indemnity reasonably satisfactory to it, and the Trustee shall not have received from the Holders of a majority in principal amount of Notes at the time Outstanding a direction inconsistent with such request, and shall have failed to institute any such proceeding, for 60 days after receipt of such notice, request and offer of indemnity. The foregoing shall not apply to any suit instituted by the Holder of this Note for the enforcement of any payment of principal hereof or any premium and interest hereon on or after the respective due dates expressed herein.

No reference herein to the Indenture or the Twelfth Supplemental Indenture and no provision of this Note or of the Indenture or the Twelfth Supplemental Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and any premium and interest on this Note at the times, place and rate, and in the coin or currency, herein prescribed.

As provided in the Indenture, as supplemented by the Twelfth Supplemental Indenture and subject to certain limitations therein set forth (including, without limitation, the restrictions on transfer under Sections 202 and 204 of the Twelfth Supplemental Indenture), the transfer of this Note is registrable in the Security Register, upon surrender of this Note for registration of transfer at the office of the Trustee or agency of the Company in any place where the principal of and any premium and interest on this Note are payable, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company, the Guarantor and

the Security Registrar duly executed by, the Holder thereof or his attorney duly authorized in writing, and thereupon one or more new Notes of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, shall be issued to the designated transferee or transferees.

The Notes are issuable only in registered form without coupons in denominations of U.S.$2,000 and integral multiples of U.S.$1,000 in excess thereof. As provided in the Indenture, as supplemented by the Twelfth Supplemental Indenture, and subject to certain limitations therein set forth, Notes are exchangeable for a like aggregate principal amount of Notes of like tenor of a different authorized denomination, as requested by the Holder surrendering the same.

No service charge shall be made for any such registration of transfer or exchange, but the Company or the Trustee may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

Prior to due presentment of this Note for registration of transfer, the Company, the Guarantor, the Trustee and any agent of the Company, the Guarantor or of the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes, whether or not this Note is overdue, and neither the Company, the Guarantor, the Trustee nor any such agent shall be affected by notice to the contrary.

[If the Note is a Global Note, then insert—This Note is a Global Note and is subject to the provisions of the Indenture and the Twelfth Supplemental Indenture relating to Global Notes, including the limitations in Section 203 of the Twelfth Supplemental Indenture on transfers and exchanges of Global Notes.]

This Note, the Guarantees and the Indenture and the Twelfth Supplemental Indenture shall be governed by, and construed in accordance with, the laws of the State of New York.

All terms used in this Note which are defined in the Indenture, as supplemented by the Twelfth Supplemental Indenture, shall have the meanings assigned to them in the Indenture, as supplemented by the Twelfth Supplemental Indenture.

ABBREVIATIONS

The following abbreviations, when used in the inscription of the face of this Note, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM -		as tenants in common		UNIF GIFT MIN ACT—
				(Cust)
TEN ENT -		as tenants by the entireties		Custodian                              under Uniform
				(Minor)
JT TEN -		as joint tenants with right of survivorship and not as tenants in common		Gifts to Minors Act
				(State)

Additional abbreviations may also be used

though not in the above list.

(c) Form of Guarantee.

Radiomóvil Dipsa, S.A. de C.V., a corporation (sociedad anónima de capital variable) organized and existing under the laws of Mexico (the “Guarantor”), hereby fully and unconditionally guarantees (such guarantee being referred to herein as the “Guarantee”), in accordance with the terms of the Indenture, dated as of March 9, 2004 and as supplemented by the Fifth Supplemental Indenture dated as of December 14, 2004 and the Eighth Supplemental Indenture, dated as of September 29, 2006 (herein called the “Indenture”, which term shall have the meaning assigned to it in such instrument, as supplemented by the Twelfth Supplemental Indenture, dated as of October 30, 2007 (the “Twelfth Supplemental Indenture”), among América Móvil, S.A.B. de C.V., the Guarantor and The Bank of New York (as successor to JPMorgan Chase Bank, N.A.), as Trustee, the full and punctual payment when due, whether at maturity, upon redemption, by acceleration or otherwise, of the principal of, premium, if any, and interest on, and any other amounts due under the Notes and all other obligations of the Company under the Indenture, as supplemented by the Twelfth Supplemental Indenture. Capitalized terms used but not defined herein shall have the respective meanings given to them in the Indenture, as supplemented by the Twelfth Supplemental Indenture.

The obligations of the Guarantor to the Holders and to the Trustee pursuant to this Guarantee and the Indenture, as supplemented by the Twelfth Supplemental Indenture, shall be limited to the maximum amount as shall, after giving effect to all other liabilities (fixed and contingent) of the Guarantor, result in the obligations of the Guarantor under the Guarantees not constituting a fraudulent conveyance or fraudulent transfer under applicable law.

The obligations of the Guarantor to the Holders and to the Trustee pursuant to this Guarantee and the Indenture, as supplemented by the Twelfth Supplemental Indenture, are expressly set forth, to the extent and in the manner provided, in Article Eleven of the Indenture, as supplemented by the Twelfth Supplemental Indenture, and reference is hereby made to such Indenture, as supplemented by the Twelfth Supplemental Indenture, for the precise terms of the Guarantee therein made.

This Guarantee shall not be valid or obligatory for any purpose until the certificate of authentication on the Notes upon which this Guarantee is noted shall have been executed by the Trustee under the Indenture, as supplemented by the Twelfth Supplemental Indenture, by the manual signature of one of its authorized signatories.

This Guarantee shall be governed by, and construed in accordance with, the laws of the State of New York.

This Guarantee is subject to release upon the terms set forth in the Indenture as supplemented by the Twelfth Supplemental Indenture.

IN WITNESS WHEREOF, the Guarantor has caused this Guarantee to be duly executed.

RADIOMÓVIL DIPSA, S.A. de C.V.,

By:

Name:

Title:

By:

Name:

Title:

Section 203. Form of Trustee’s Certificate of Authentification

The Trustee’s certificate of authentification shall be in substantially the following form:

This is one of the Notes referred to in the within-mentioned Indenture, as supplemented by the Twelfth Supplemental Indenture.

Dated:

THE BANK OF NEW YORK,

as Trustee

By:

Authorized Officer

Section 204. Maintenance of Office or Agency

(a) With respect to any Notes that are not in the form of a Global Note, the Company shall maintain in the Borough of Manhattan, New York an office or agency, in each case, in accordance with Section 1002 of the Base Indenture.

(b) If and for so long as the Notes are admitted to listing on the Official List of the Luxembourg Stock Exchange and trading on the EuroMTF, the Company shall maintain pursuant to Section 1002 of the Base Indenture an office or agency in Luxembourg where the Notes may be presented or surrendered for payment, where the Notes may be surrendered for registration of transfer or exchange and where notices and demands to or upon the Company in respect of the Notes and the Base Indenture, as supplemented by this Twelfth Supplemental Indenture, may be served. The Company has initially appointed The Bank of New York (Luxembourg) S.A. as the Paying Agent and the agent for such transfers and exchanges and for such notices and demands in Luxembourg with respect to the Notes. The Bank of New York (Luxembourg) S.A. has its main offices at Xxxxxxxx Xxxxxx, 0X Xxxxxxxxx, X- 0000 Xxxxxxxxxxxxx, Xxxxxxxxxx.

(x) If for any reason The Bank of New York (Luxembourg) S.A. shall not continue as the Paying Agent or agent for such transfers and exchanges and for such notices and demands in Luxembourg with respect to the Notes and the Notes admitted to listing on the Official List of the Luxembourg Stock Exchange and trading on the EuroMTF, the Company shall appoint a substitute Paying Agent or agent in Luxembourg, in accordance with the rules then in effect of the Luxembourg Stock Exchange and the provisions of the Base Indenture, as supplemented by this Twelfth Supplemental Indenture, and the Notes. Following the appointment of a substitute Paying Agent or agent in Luxembourg, the Company shall give the Holders of the Notes notice of such appointment pursuant to Section 106 of the Base Indenture.

Section 205. EuroMTF Listing

The Company shall use its reasonable best efforts to have the Notes admitted to listing on the Official List of the Luxembourg Stock Exchange and trading on the EuroMTF; provided, however, that the Company shall not be required to maintain such admission to listing and trading.

ARTICLE THREE

MISCELLANEOUS PROVISIONS

Section 301. Separability of Invalid Provisions

In case any one or more of the provisions contained in this Twelfth Supplemental Indenture should be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions contained in this Twelfth Supplemental Indenture, and to the extent and only to the extent that any such provision is invalid, illegal or unenforceable, this Twelfth Supplemental Indenture shall be construed as if such provision had never been contained herein.

Section 302. Execution in Counterparts

This Twelfth Supplemental Indenture may be simultaneously executed and delivered in any number of counterparts, each of which when so executed and delivered shall be deemed to be an original, and such counterparts shall together constitute but one and the same instrument.

Section 303. Certain Matters

The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Twelfth Supplemental Indenture or for or in respect of the recitals contained herein, all of which are made solely by the Company and the Guarantor.

IN WITNESS WHEREOF, the parties hereto have caused this Twelfth Supplemental Indenture to be duly executed on their respective behalves, all as of the day and year first written above.

AMÉRICA MÓVIL, S.A.B. DE C.V.,
as Issuer
By:		/s/ Xxxxxx Xxxx Xxxxxx Xxxxxx Xxxxxxxx
Name:		Xxxxxx Xxxx Xxxxxx Xxxxxx Xxxxxxxx
Title:		Chief Financial Officer
By:		/s/ Xxxxxxxxx Xxxxx Xxxxxxx
Name:		Xxxxxxxxx Xxxxx Xxxxxxx
Title:		General Counsel
RADIOMÓVIL DIPSA, S.A. DE C.V.,
as Guarantor
By:		/s/ Xxxxxx Xxxx Xxxxxx Xxxxxx Xxxxxxxx
Name:		Xxxxxx Xxxx Xxxxxx Xxxxxx Xxxxxxxx
Title:		Attorney-in-Fact
By:		/s/ Xxxxxxxxx Xxxxx Xxxxxxx
Name:		Xxxxxxxxx Xxxxx Xxxxxxx
Title:		General Counsel
THE BANK OF NEW YORK,
as Trustee and Principal Paying Agent
By:		/s/ Xxxxx Xxxxx
Name:		Xxxxx Xxxxx
Title:		Vice President
THE BANK OF NEW YORK (LUXEMBOURG) S.A.,
as Luxembourg Paying Agent
By:		/s/ Xxxxx Xxxxx
Name:		Xxxxx Xxxxx
Title:		Attorney-in-fact