Exhibit 4.8



FOURTH AMENDMENT TO

MANAGEMENT
SERVICES AGREEMENT



Between



SBC INTERNATIONAL MANAGEMENT SERVICES, INC.



A corporation duly organized under the laws of the State of Delaware, United States of
America, with headquarters in Wilmington, Delaware, USA, hereinafter SBCI-MSI, with Permanent Establishment in Mexico. Establishment in the terms provided in the Income Tax Law with address at Parque Via 190-12thfloor, Colonia Cuauhtémoc 06599 Mexico, D. F.



and



AMÉRICA MÓVIL S.A. DE C.V.



A corporation duly organized under the laws of the United Mexican States, with its principal place of business in Mexico City, D.F., hereinafter AMÉRICA
MÓVIL.





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The FOURTH AMENDMENT TO MANAGEMENT SERVICES AGREEMENT, is made as of Jan 31, 2005 (this
Amendment), between SBC INTERNATIONAL MANAGEMENT SERVICES, INC., a corporation duly organized under the laws of the State of Delaware, United States of America, with headquarters in Wilmington, Delaware, USA, with Permanent Establishment
in the United Mexican States under the Income Tax Law with address at Parque Via 190-12thfloor, Colonia
Cauahtémoc 06599 Mexico. D F (hereinafter SBCI-MSI) and AMÉRICA MÓVIL S.A. DE C.V., a corporation duly organized under the laws of the United Mexican States, with its principal place of business in Mexico City, D.F.
(hereinafter AMÉRICA MÓVIL).



WHEREAS, SBCI-MSI and AMERICA MÓVIL entered into that certain Management Services Agreement dated February 27, 2002 as amended by that certain First Amendment to Management Services Agreement dated as of January 1, 2003. Second
Amendment in Management Services Agreement dated as of October 29, 2003 and Third Amendment to Management Services Agreement Dated as of January 1, 2004 (as amended, the MSA); and



WHEREAS, SBCI-MSI and AMÉRICA MÓVIL desire to amend to MSA as
provided herein.



NOW, THEREFORE, in consideration of the
premises and the mutual agreements and covenants hereinafter set forth, the parties hereto hereby agree as follows:



SECTION 1. In accordance with the terms of Clause FOURTH of the MSA, AMÉRICA MÓVIL shall pay SBCI-MSI ONE MILLION US DOLLARS
(US$1,000,000.00) plus value added tax for the fourth year of the initial term of the MSA in compensation for services rendered by SBCI-MSI thereunder. AMÉRICA MÓVIL shall make this One Million US Dollar (US$1,000,000.00) payment to
SBCI-MSI plus value added tax in a one-time payment on February



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28, 2005 through wire transfer of immediately available funds payable in United States Dollars to a bank account designated by SBCI-MSI. Six months prior to
the expiration of the MSA (which expiration is currently December 31, 2005 under Clause Six of the MSA) the parties shall begin consultations and use best efforts to agree on further services and the compensation to be paid SBCI-MSI for such
services.



SECTION 2. This Amendment and the MSA hereby are
each confirmed as being in full force and effect.



SECTION 3.
This Amendment may be executed in one or more counterparts, and by the different parties hereto in separate counterparts, each of which when executed shall be deemed to be an original but all of which taken together shall constitute one and the same
agreement.



SECTION 4. For interpretation and fulfillment of
this Amendment, the parties expressly agree to submit to the laws of the territory and courts of Mexico City, D.F., waiving the application of any other law or jurisdiction of any court that might have jurisdiction over them by reason of their
current or future address.



This agreement is entered in Mexico City, Federal
District on the date first set forth above.



|                                           |  |                         |  |                           |  |     |  |                         
|------------------------------------------ |  | ----------------------- |  | ------------------------- |  | --- |  | ------------------------
|SBC INTERNATIONAL MANAGEMENT SERVICES INC. |  |                         |  | AMÉRICA MÓVIL S.A. DE CV.
|                                           |  |                         |  |                          
|                                           |  | /s/ Rick Resnick        |  |                           |  |     |  | /s/ Daniel Hajj Aboumrad
|By:                                        |  | Rick Resnick            |  |                           |  | By: |  | Daniel Hajj Aboumrad    
|                                           |  | President SBCI  Mexico |  |                           |  |     |  | Director General        



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