Exhibit 8.1

List of certain subsidiaries of América Móvil, S.A.B. de C.V.



|                                                                        |  |                    |  |                      |       |  |               |                                                
|----------------------------------------------------------------------- |  | ------------------ |  | -------------------- | ----- |  | ------------- | -----------------------------------------------
|Name of Company                                                         |  | Jurisdiction       |  | OwnershipInterest(1) |       |  | Main Activity
|AMX Tenedora, S.A. de C.V.                                              |  | Mexico             |  |                      | 100.0 |  |               | Holding Company                                
|Compañía Dominicana de Teléfonos, S. A. (Codetel)                       |  | Dominican Republic |  |                      | 100.0 |  |               | Fixed-line/Wireless                            
|Sercotel, S.A. de C.V.                                                  |  | Mexico             |  |                      | 100.0 |  |               | Holding Company                                
|Radiomovil Dipsa, S.A. de C.V. and subsidiaries (Telcel)                |  | Mexico             |  |                      | 100.0 |  |               | Wireless                                       
|Puerto Rico Telephone Company, Inc.                                     |  | Puerto Rico        |  |                      | 100.0 |  |               | Fixed-line/Wireless                            
|PRT Larga Distancia, Inc.                                               |  | Puerto Rico        |  |                      | 100.0 |  |               | Fixed-line/Wireless                            
|Servicios de Comunicaciones de Honduras, S.A. de C.V. (Sercom Honduras) |  | Honduras           |  |                      | 100.0 |  |               | Wireless                                       
|TracFone Wireless, Inc.                                                 |  | USA                |  |                      | 98.2  |  |               | Wireless                                       
|Claro Telecom Participacões, S.A.                                       |  | Brazil             |  |                      | 100.0 |  |               | Holding                                        
|Americel S.A.                                                           |  | Brazil             |  |                      | 99.4  |  |               | Wireless                                       
|Claro S.A.                                                              |  | Brazil             |  |                      | 99.9  |  |               | Wireless                                       
|Telecomunicaciones de Guatemala, S.A.                                   |  | Guatemala          |  |                      | 99.3  |  |               | Fixed-line/Wireless                            
|Empresa Nicaragüense de Telecomunicaciones, S.A. (Enitel)               |  | Nicaragua          |  |                      | 99.5  |  |               | Fixed-line/Wireless                            
|Cablenet, S.A.                                                          |  | Nicaragua          |  |                      | 100.0 |  |               | Cable TV                                       
|Estaciones Terrenas de Satélite, S.A. (Estesa)                          |  | Nicaragua          |  |                      | 100.0 |  |               | Cable TV                                       
|Compañía de Telecomunicaciones de El Salvador (CTE), S.A. de C.V.       |  | El Salvador        |  |                      | 95.8  |  |               | Fixed-line                                     
|Cablenet, S.A. (Cablenet)                                               |  | Guatemala          |  |                      | 95.8  |  |               | Fixed-line                                     
|Telecomoda, S.A. de C.V. (Telecomoda)                                   |  | El Salvador        |  |                      | 95.8  |  |               | Directories Provider                           
|CTE Telecom Personal, S.A. de C.V.                                      |  | El Salvador        |  |                      | 95.8  |  |               | Wireless                                       
|Comunicación Celular S.A. (Comcel)(2)                                   |  | Colombia           |  |                      | 99.4  |  |               | Wireless                                       
|Megacanales, S.A.                                                       |  | Colombia           |  |                      | 99.4  |  |               | Cable TV                                       
|The Now Operation, S.A.                                                 |  | Colombia           |  |                      | 99.4  |  |               | Services to Cable TV Provider                  
|Telmex Colombia, S.A.                                                   |  | Colombia           |  |                      | 99.1  |  |               | Fixed-line and Cable TV                        
|Consorcio Ecuatoriano de Telecomunicaciones, S.A. (Conecel)             |  | Ecuador            |  |                      | 100.0 |  |               | Wireless                                       
|AMX Argentina, S.A.                                                     |  | Argentina          |  |                      | 100.0 |  |               | Wireless                                       
|AMX Paraguay, S.A.                                                      |  | Paraguay           |  |                      | 100.0 |  |               | Wireless                                       
|AM Wireless Uruguay, S.A.                                               |  | Uruguay            |  |                      | 100.0 |  |               | Wireless                                       
|Claro Chile S.A.                                                        |  | Chile              |  |                      | 100.0 |  |               | Wireless                                       
|América Móvil Perú, S.A.C.                                              |  | Peru               |  |                      | 100.0 |  |               | Wireless                                       
|Telmex Perú, S.A.(3)                                                    |  | Peru               |  |                      | 99.6  |  |               | Fixed-line/Cable TV                            
|Oceanic Digital Jamaica Limited(4)                                      |  | Jamaica            |  |                      | 99.6  |  |               | Wireless                                       
|Claro Panamá, S.A.(4)                                                   |  | Panama             |  |                      | 99.7  |  |               | Wireless                                       
|Carso Global Telecom, S.A.B. de C.V.                                    |  | Mexico             |  |                      | 99.9  |  |               | Holding Company                                
|Empresas y Controles en Comunicaciones, S.A. de C.V.                    |  | Mexico             |  |                      | 99.9  |  |               | Holding Company                                
|Teléfonos de México, S.A.B. de C.V.                                     |  | Mexico             |  |                      | 59.5  |  |               | Fixed-line                                     
|Integración de Servicios TMX, S.A. de C.V.                              |  | Mexico             |  |                      | 59.5  |  |               | Holding Company                                
|Alquiladora de Casas, S.A. de C.V.                                      |  | Mexico             |  |                      | 59.5  |  |               | Real Estate                                    
|Compañía de Teléfonos y Bienes Raíces, S.A. de C.V.                     |  | Mexico             |  |                      | 59.5  |  |               | Real Estate                                    
|Consorcio Red Uno, S.A. de C.V.                                         |  | Mexico             |  |                      | 59.5  |  |               | Telecommunications Network Integration Services
|Teléfonos del Noroeste, S.A. de C.V.                                    |  | Mexico             |  |                      | 59.5  |  |               | Fixed-line                                     
|Uninet, S.A. de C.V.                                                    |  | Mexico             |  |                      | 59.5  |  |               | Corporate networks and Internet Access Services
|Telmex USA, L.L.C.                                                      |  | USA                |  |                      | 59.5  |  |               | Fixed-line                                     



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|                                                              |  |              |  |                      |      |  |               |                                     
|------------------------------------------------------------- |  | ------------ |  | -------------------- | ---- |  | ------------- | ------------------------------------
|Name of Company                                               |  | Jurisdiction |  | OwnershipInterest(1) |      |  | Main Activity
|Telmex Internacional, S.A.B. de C.V.                          |  | Mexico       |  |                      | 96.8 |  |               | Holding Company                     
|Controladora de Servicios de Telecomunicaciones, S.A. de C.V. |  | México       |  |                      | 96.8 |  |               | Holding Company                     
|Telstar, S.A.                                                 |  | Uruguay      |  |                      | 95.4 |  |               | Fixed-line                          
|Ecuador Telecom, S.A.                                         |  | Ecuador      |  |                      | 96.8 |  |               | Fixed-line                          
|Empresa Brasileira de Telecomunicacões, S.A. (Embratel)       |  | Brazil       |  |                      | 94.2 |  |               | Fixed-line                          
|Star One, S.A.                                                |  | Brazil       |  |                      | 75.4 |  |               | Provider of Satellite Services      
|Telmex Argentina, S.A.                                        |  | Argentina    |  |                      | 95.6 |  |               | Services to Corporate Customers     
|Ertach, S.A.                                                  |  | Argentina    |  |                      | 95.6 |  |               | Wireless                            
|Claro Comunicaciones, S.A.                                    |  | Chile        |  |                      | 96.8 |  |               | Fixed-line/Wireless                 
|Claro Servicios Empresariales, S.A.                           |  | Chile        |  |                      | 96.8 |  |               | Fixed-line/Wireless                 
|Páginas Telmex Colombia, S.A.                                 |  | Colombia     |  |                      | 96.8 |  |               | Directories Provider                
|Sección Amarilla USA, LLC                                     |  | USA          |  |                      | 96.8 |  |               | Directories Provider                
|Publicidad y Contenido Editorial, S.A. de C.V.                |  | Mexico       |  |                      | 96.8 |  |               | Provider of Cable Television Content
|Editorial Contenido, S.A. de C.V.                             |  | Mexico       |  |                      | 96.8 |  |               | Magazine Editor                     



|(1) | Percentage of equity owned by América Móvil, S.A.B. de C.V. directly or indirectly through subsidiaries or affiliates.
|--- | ----------------------------------------------------------------------------------------------------------------------

|(2) | During 2009 through December 21, 2010, Comunicación Celular, S.A. held 100% of the ownership interest in AMX Santa Lucía, Inc. and 78.2% in Claro
Panamá, S.A.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | On December 21, 2010, Amov Colombia, S.A. and Comunicación Celular, S.A. capitalized Telmex Perú, S.A. As a result, the equity owned by AMX in Telmex
Perú, S.A. decreased from 100% to 99.6%.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(4) | On December 21, 2010, Comunicación Celular, S.A. capitalized: (i) its full ownership interest in AMX Santa Lucía, Inc. into Telmex Perú,
S.A and, therefore, the equity owned by América Móvil, S.A.B. de C.V in AMX Santa Lucía, Inc. and in Oceanic Digital Jamaica, Ltd. increased from 99.4% to 99.6% in both companies; and, (ii) its ownership interest in Claro
Panama, S.A. (78.2% of capital shares) into Telmex Perú, S.A. and, as a result, the ownership interest of América Móvil, S.A.B. de C.V in Claro Panamá, S.A. increased from 99.4% to 99.7%.
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