Document:

Services Agreement, dated February 23, 2009

 Exhibit 4.2 
 THIS SERVICE AGREEMENT (THE “AGREEMENT”) IS EXECUTED BY AND BETWEEN CARSO GLOBAL TELECOM, S.A.B. DE C.V., HEREINAFTER THE “SERVICE PROVIDER” REPRESENTED BY MR. ARMANDO IBANEZ VAZQUEZ AND CONTROLADORA DE SERVICIOS DE
TELECOMUNICACIONES, S.A. DE C.V., HEREINAFTER “CONSERTEL” REPRESENTED BY MR. EDUARDO ALVAREZ RAMIREZ DE ARELLANO, WHICH PARTIES WILL BE REFERRED TO JOINTLY AS THE “PARTIES” OR INDIVIDUALLY AS THE PARTY, ACCORDING TO THE FOLLOWING
RECITALS AND CLAUSES. 
 RECITALS 
  

	I.	The Service Provider, through its representative, states that: 

  

	 	a)	It is a company duly incorporated and validly existing according to the laws of Mexico. Its domicile is located at Insurgentes Sur 3500, Torre Telmex, Quinto piso, Col. Pena Pobre,
C.P. 14060, Delegación Tlalpan, México, Distrito Federal; 

  

	 	b)	Its representative has sufficient power and authority to obligate the company according to the terms hereunder, which power has not been amended, limited or revoked in any manner
whatsoever; 

  

	 	c)	Its corporate purpose, among other activities, is to promote, organize and administer all kinds of business corporations as well as civil partnerships; to provide management,
organization, tax, legal and consulting services to companies; 

  

	 	d)	It has the necessary elements to properly provide the services subject matter of this Agreement. 

  

	II.	CONSERTEL, through its representative, states that: 

  

	 	a)	It is a company duly incorporated and validly existing according to the laws of Mexico. Its domicile is located at Parque Via número 198, colonia Cuauhtemoc,
Delegación Cuauhtemoc, C.P. 60599, México, Distrito Federal. 

  

	 	b)	Its representative has sufficient power and authority to obligate the company according to the terms hereunder, which power has not been amended, limited or revoked in any manner
whatsoever; 

	 	c)	Its corporate purpose, among other activities, is to promote, create, organize, exploit, acquire and hold an interest in the capital stock or equity of all kinds of business
corporations, civil partnerships or companies, whether domestic or foreign industrial, commercial, service providers or any other, as well as providing and receiving all kinds of consulting services and technical, scientific and management
assistance. 

  

	 	d)	It desires to engage the services of the “Service Provider” in order to carry out its operations in the best manner possible. 

  

	III.	In consideration of the mutual covenants set out in this Agreement and for other good and valuable consideration, the receipt and sufficiency of which is acknowledged, the Parties
agree as follows: 

 CLAUSES 
 ONE.- The Service Provider hereby undertakes to provide consulting and advisory services to CONSERTEL and/or its Affiliates regarding the management and operation specified below: 
  

	 	1.	Evaluation of the departments, positions and persons contracted by CONSERTEL as well as its Affiliates; 

  

	 	2.	Review and, if applicable, assistance with the restructuring of the labor contracts; 

  

	 	3.	Technical, management and financial planning; 

  

	 	4.	Implementation of management and operational systems and controls; 

  

	 	5.	Planning and negotiation of investments, optimizing returns earned from the company’s resources; 

  

	 	a)	Optimizing the design and investments in telecommunication network equipment; 

  

	 	b)	Analysis and evaluation of new investments and acquisitions. 

	 	6.	Preparation of programs to transform CONSERTEL into a efficient and streamlined operation to aggressively grow in such a manner that CONSERTEL improves and maintains its service
quality at international levels; 

  

	 	7.	Restructuring policies on tariff, commercial, technical and service matters; 

  

	 	8.	Preparation of relocation plans for personnel; 

  

	 	9.	Assistance in managing the Instituto Tecnológico de Teléfonos de México, S.C. 

  

	 	10.	Executing, if applicable, real-estate investment plans that substantially reduce its numbers and amounts; 

  

	 	11.	Drafting rules and regulations for construction; 

  

	 	12.	Assessing alternatives that occur within the technical-financial studies carried out for the CONSERTEL operations; 

 Generally, the Service Provider undertakes to render services for the regeneration, reorganization and restructuring of CONSERTEL and its Affiliates through the
planning, execution and oversight of several areas within each company, to the Parties’ satisfaction. 
 Hereinafter these services will be referred to
as the “Services”. 
 For the purposes of this Agreement, an Affiliate will mean any company that controls or is controlled by or is under the
joint control of CONSERTEL, whether directly or indirectly in any of the foregoing cases. 
 TWO.- CONSERTEL will never invest the Service Provider
with decision-making power regarding the company’s management; therefore, the Board of Directors, the Office of the CEO and/or the Corporate Committees of CONSERTEL will be exclusively authorized and responsible for taking any decision about
the company’s management without any interference by the Service Provider. 
 THREE.- The Service Provider will render the Services with its own
means or through third parties that the Service Provider may contract; however, the Service Provider will be exclusively liable for said third parties. 
 FOUR.- CONSERTEL undertakes to pay the Service Provider the total amount equivalent in Mexican Pesos to $22,500,000.00 US dollars (TWENTY TWO 

 
MILLION FIVE HUNDRED THOUSAND US DOLLARS 00/100) plus the corresponding Value Added Tax (VAT) as the consideration for its service rendering. 
 This consideration will be paid by CONSERTEL to the Service Provider in a single installment by February 27th, 2009. 
 To determine
the amount of the aforementioned payment in Mexican Pesos, the parties will use the rate of exchange to pay obligations set in foreign currency payable in Mexico that is published in the Daily Gazette of the Federation on the day immediately prior
to the payment date. 
 In the event that CONSERTEL requires services that are not included in this Agreement, the Service Provider will charge the
additional amount agreed by the Parties. 
 The receipt issued by the Service Provider for the payment will be made out to CONSERTEL according to the terms
hereunder and must include the applicable legal and administrative tax requirements including expressly and separately charging value added tax (VAT). 
 FIVE.- The Service Provider intends on complying with the obligations undertaken hereunder in good faith and in the best possible manner as well as providing the Services by its own means or that of others. Furthermore, the Service
Provider hereby unconditionally undertakes to be strictly responsible for any liability regarding the persons employed to provide the Services; therefore, the Service Provider will be solely liable for the labor contracts and any other type of
contract executed with said personnel and, if applicable, will pay the fees and other labor benefits such as social security dues, workers’ housing dues, income tax and other charges that may be generated. The Service Provider will hold
CONSERTEL harmless from any dispute that may arise with the aforementioned personnel and from any claim resulting from work accidents or illness thereof. 
 At the request of the Service Provider, CONSERTEL hereby grants sufficient powers to board members, consultants and committee members of the Service Provider so that if necessary, said attorneys-in-fact may provide the Services on behalf of
CONSERTEL. However, it is hereby understood that a work relationship does not exist between the attorneys-in-fact and CONSERTEL, but that the agreement stipulated in the paragraph above will apply in regard to the relationship between the Service
Provider and its board members, consultants and committee members. 
 SIX.- The valid term of this Agreement will start as of its
signature date and will conclude exactly on December 31st, 2009. 
 SEVEN.- Regarding any matter regarding the validity, construction and compliance hereunder, the laws of the Federal District and the Federal Laws will apply as
well as any court resolution that may arise, the Parties submit to the competent courts of Mexico City, Federal District; thereby expressly waiving any other jurisdiction that may correspond by reason of their nationality, domicile or residence.

 IN WITNESS WHEREOF, this Agreement has been executed in two counterparts and signed in Mexico City,
Federal District on February 23rd, 2009. 
  

									
		 	 CARSO GLOBAL TELECOM,
 S.A.B DE C.V.
	 		 		 	 CONTROLADORA DE SERVICIOS
 DE TELECOMUNICACIONES, S.A.
 DE C.V.

					
		 	/s/ C.P. Armando Ibáñez Vázquez	 		 		 	/s/ Lic. Eduardo Alvarez Ramírez de Arellano
		 	 C.P. Armando Ibáñez Vázquez
 Attorney-in-fact
	 		 		 	 Lic. Eduardo Alvarez Ramírez de Arellano
 Attorney-in-fact

					
		 	Witness	 		 		 	Witness
					
		 	/s/ C.P. Francisco Ángeles Mayorga	 		 		 	/s/ Lic. Gabriel Juárez Lozano
		 	C.P. Francisco Ángeles Mayorga	 		 		 	Lic. Gabriel Juárez LozanoService Agreement for Management and Operation, dated January 1, 2009

 Exhibit 4.3 
 THIS SERVICE AGREEMENT FOR MANAGEMENT AND OPERATION 
 IS EXECUTED BY AND BETWEEN 
 AT&T MEXICO, INC 
 A company duly organized and
validly existing according to the laws of the State of Delaware, United States of America, with headquarters in Wilmington, Delaware, USA, hereinafter “ATT-MX” and with permanent establishment in Mexico according to the provisions of the
Income Tax Law, with domicile located at Parque Via número 190, piso 12, colonia Cuauhtemoc, 06599, Mexico, Distrito Federal, represented by Mr. Larry Boyle, acting in the capacity of legal representative; 
 AND 
 CONTROLADORA DE SERVICIOS DE
TELECOMUNICACIONES, S.A. DE C.V. 
 A company duly organized and validly existing according to the laws of the Mexico, with headquarters in Mexico City,
Federal District, represented by Mr. Eduardo Alvarez Ramirez de Arellano, acting in the capacity of legal representative, hereinafter called “CONSERTEL”; ATT-MX and CONSERTEL will jointly be referred to as the “Parties” or
individually as the “Party”. 
 RECITALS 
  

	I.	ATT-MX, through its representative, states that: 

  

	a)	It is a company duly incorporated and validly existing according to the laws of the State of Delaware, United States of America; 

  

	b)	Its principle activity is to invest in telecommunication services and to provide these worldwide; and 

  

	c)	It has the economical, financial, administrative capacity as well as the know-how, specialized personnel, technical assistance, equipment, programs, necessary resources as well as
the corporate authorizations to become obligated under the terms of this Agreement and/or any Annex that may be executed from time to time by the Parties. 

	II.	CONSERTEL, through its representative, states that: 

  

	a)	It is a company duly incorporated and validly existing according to the laws of Mexico. Its domicile is located at Insurgentes Sur 3500, Col. Peña Pobre, C.P. 01460, Del.
Tlalpan, México, D.F. 

  

	b)	In general, its corporate purpose includes promoting, creating, organizing, exploiting, acquiring and holding an interest in the capital stock or equity of all types of business
corporations, civil partnerships, associations or companies, whether industrial, commercial, service providers or any other type, both national and foreign, as well as participating in their management or liquidation; receiving from other companies
or persons as well as rendering or providing to other companies or persons any service that may be necessary to achieve their corporate purpose or objectives. 

 CONSERTEL desires to engage the services that ATT-MX may provide to it and/or to its Subsidiaries in order to improve their operations. 
 CLAUSES 
 ONE.- Subject to the terms and conditions hereunder, ATT-MX accepts to provide to CONSERTEL and/or
its Subsidiaries, the professional consulting and advisory services in all or any of the following areas: 
  

	 	1.	Evaluation and consulting on all management decisions for CONSERTEL and its Subsidiaries; 

  

	 	2.	Consulting on daily operations; 

  

	 	3.	Consulting on technical, administrative and financial planning; 

  

	 	4.	Consulting on matters regarding the introduction of systems for management and operational control; 

  

	 	5.	Consulting on design and planning of investments to streamline the central and external plants; 

	 	6.	Review and recommendations regarding all plans of actions for tariffs, commercial relations and regulation efforts; 

  

	 	7.	Consulting on planning for the employee evaluations; 

  

	 	8.	Consulting on plans to reduce the total investment in real-estate; 

  

	 	9.	Recommendations on the establishment of construction procedures; 

  

	 	10.	In general, consulting on reorganization, streamlining and restructuring CONSERTEL and its subsidiaries. 

 Hereinafter, these services will be referred to as the “Services”; in terms of the details and conditions applicable to the Services. These Services will be agreed upon in writing by the Parties through
Annexes that form an essential part of this Agreement. When providing the Services, AT&T-MX will only disclose the information approved for a general exportation license that does not require written guarantees as established by the Department
of Commerce of the United States of America. 
 For the purposes of this Agreement, “Subsidiary” means any company that controls or is controlled
by or is under the joint control of CONSERTEL, whether directly or indirectly in any of the foregoing cases and subject to the terms and conditions hereunder. 
 TWO.- CONSERTEL or its Subsidiaries will exclusively use the information and materials transferred by ATT-MX, which may not be assigned, resold, licensed or otherwise transferred to another individual or company, except between the
same subsidiaries and CONSERTEL. The information and materials will be owned exclusively by ATT-MX or, if applicable, by its subsidiaries, affiliates, branches or any other company within the ATT-MX Group and will continue subject only to the right
afforded to CONSERTEL to use the information and materials in their own operations in the region where it may be present or though its Subsidiaries. 
  

	 	1.	 The information and materials that ATT-MX provides CONSERTEL and/or its Subsidiaries (including without limitation documents, data, drawings, designs, instructions,
specifications and other information), which ATT-MX considers confidential and that are marked or identified as confidential will be disclosed to CONSERTEL and/or its Subsidiaries in the understanding that said information is confidential and may
not be reproduced or disclosed to any third parties nor may be used by CONSERTEL and/or its Subsidiaries for any other purpose other than to carry out the transactions stipulated herein. In particular, such documents and data will not be available
for companies or persons that are not employees, agents or subcontractors of CONSERTEL. CONSERTEL will take reasonable 

	 	 
technical and commercial measures to guarantee that such companies and persons that have access to the documents and data keep these confidential.

  

	 	2.	Taking into consideration the significant amount that ATT-MX invested to develop the information and materials, the steep market competition, the nature of the property rights to
the information and the risk of losing the property rights of ATT-MX as a result of disclosing information to third parties, CONSERTEL undertakes to keep the information and materials classified by ATT-MX as confidential for a period of five years
following the termination of this Agreement or prior thereto if said information and materials have been made public by legal means. 

  

	 	3.	At the termination of this Agreement due to a breach by CONSERTEL, which is not remedied within the next 3 (three) business days following the notice date of such breach, CONSERTEL
will return to ATT-MX all of the documents, data and other material provided by ATT-MX or gathered by CONSERTEL from the information and materials thereby provided that are in the possession of CONSERTEL or under their control and CONSERTEL will not
be entitled to keep any copy, excerpt or translation of said documents. 

  

	 	4.	ATT-MX hereby authorizes CONSEERTEL to disclose the information and materials, including the confidential information and materials to its Subsidiaries because of the various
activities that CONSERTEL develops through these. 

 In the event that a company ceases to be a Subsidiary of CONSERTEL,
CONSERTEL will take sufficient measures to ensure that the company complies with the confidentiality obligation regarding the information included in this section. Moreover, CONSERTEL will take the necessary actions to return any information
submitted to the company that has ceased to be a Subsidiary of CONSERTEL. 
 THREE.- ATT-MX will provide the Services with its own resources located
in Mexico City. The Services that require the resources from other sources or subsidiaries of ATT-MX will be contracted separately and in addition to this Agreement. 
 FOUR.- CONSERTEL undertakes to pay ATT-MX under this Agreement, a total annual sum of US $2,875,000.00 (Two million eight hundred and seventy five thousand US dollars), which amount includes value added tax.
CONSERTEL will make the payment to ATT-MX in a single installment on February 25th, 2009, through a bank or cable transfer sent directly to the bank account indicated below, unless otherwise notified at least 15 (fifteen) calendar days prior to the date indicated above. In the event that CONSERTEL requires services that
are not included in this Agreement, the ATT-MX will charge the additional amount agreed by the Parties. 

 The bank transfer in favor of ATT-MX will be made to: 
 BANK: JP MORGAN CHASE BANK 
 LOCATION: NEW YORK 
 ACCOUNT NUMBER: 011 037 790 020 
 FOR FURTHER CREDIT: AT&T MEXICO, INC. 
 In the event that CONSERTEL makes payments in pesos, the conversion of the obligation from dollars to pesos, as established in this Clause Four, will be made at the rate
of exchange for Treasury Bonds freely available at 12:00 PM on the previous day prior to payment. In any case, CONSERTEL must pay ATT-MX a sufficient amount in Mexican pesos so that ATT-MX may purchase the total amount of US dollars stipulated in
this first paragraph of this clause. 
 FIVE.- ATT-MX will be exclusively responsible for all of employee salaries, benefits, taxes and expenses.
CONSERTEL agrees that the request of ATT-MX, CONSERTEL will provide the proper information and cooperation to ATT-MX so that ATT-MX may comply with its obligations hereunder. 
 SIX.- This Agreement will be in force and effect for the period beginning on January 1st, 2009 and concluding on December 31st, 2009. 
 SEVEN.- Nothing herein
may be construed as a license to any patent, registered trademark, corporate name, operational practices or any other intellectual property right of ATT-MX or its Affiliates. The use by CONSERTEL of any patent, copyright, registered trademark,
corporate name, operational practices or any other intellectual property right of ATT-MX or its Affiliates will be established by a separate license agreement and any remuneration stipulated in the aforementioned separate license agreement will be
in addition to the remuneration established herein. 
 EIGHT.- The Parties will not be liable for the loss or damages resulting from any delay in
compliance or by the breach of any obligation hereunder, when such delay is caused by force majeure or as a result of complying with the laws, regulations, orders or instructions of any federal, state or municipal governmental authority of the
United States of America or Mexico or resulting from an amendment to any laws, regulations, orders or instructions that may affect the obligations of the parties hereunder. 
 NINE.- The Parties agree to hold the other Party harmless from any claim or liability they may incur as a result of the actions carried out or omitted by the other Party. 
 TEN.- Regarding the construction of and compliance with this Agreement, the Parties expressly submit to the applicable laws and competent courts of Mexico City,
Federal District; thereby waiving any other law or venue that may correspond by reason present or future domicile. 

 IN WITNESS WHEREOF, this Agreement has been executed in two counterparts and signed in Mexico City,
Federal District on January 1st, 2009. 
  

					
	AT&T MEXICO, INC.	 		 	CONTROLADORA DE SERVICIOS DE TELECOMMUNICACIONES, S.A.
			
	 /s/ Larry Boyle
	 		 	 /s/ Eduardo Alvarez Ramirez de Arellano 

	 Larry Boyle
 Legal Representative
	 		 	 Eduardo Alvarez Ramirez de Arellano
 Legal
Representative

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