Exhibit 8.1

List of Certain Subsidiaries of América Móvil, S.A.B. de C.V.

As of March 31, 2014



|                                                                        |  |                   |  |                      |       |  |               |                                              
|----------------------------------------------------------------------- |  | ----------------- |  | -------------------- | ----- |  | ------------- | ---------------------------------------------
|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)                       |  | DominicanRepublic |  |                      | 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                         
|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                                      
|Claro S.A.                                                              |  | Brazil            |  |                      | 100.0 |  |               | Wireless                                     
|Americel S.A.                                                           |  | Brazil            |  |                      | 100.0 |  |               | Wireless                                     
|Telecomunicaciones de Guatemala, S.A.                                   |  | Guatemala         |  |                      | 99.3  |  |               | Fixed-line/ Wireless                         
|Empresa Nicaragüense de Telecomunicaciones, S.A. (Enitel)               |  | Nicaragua         |  |                      | 99.6  |  |               | 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)                                      |  | Colombia          |  |                      | 99.4  |  |               | Wireless                                     
|Telmex Colombia, S.A.                                                   |  | Colombia          |  |                      | 99.3  |  |               | Fixed-line/ CableTV                          
|Consorcio Ecuatoriano de Telecomunicaciones, S.A. (Conecel).            |  | Ecuador           |  |                      | 100.0 |  |               | Wireless                                     
|AMX Argentina, S.A.                                                     |  | Argentina         |  |                      | 100.0 |  |               | Wireless                                     
|Telmex Argentina, S.A.                                                  |  | Argentina         |  |                      | 99.6  |  |               | Services toCorporateCustomers                
|Telstar, S.A.                                                           |  | Uruguay           |  |                      | 99.9  |  |               | Fixed-line                                   
|Flimay, S.A.                                                            |  | Uruguay           |  |                      | 99.9  |  |               | DTH                                          
|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                                     
|Claro Servicios Empresariales, S.A.                                     |  | Chile             |  |                      | 99.4  |  |               | Fixed-line/ Wireless                         
|América Móvil Perú, S.A.                                                |  | Peru              |  |                      | 100.0 |  |               | Wireless                                     
|Claro Panamá, S.A.                                                      |  | Panama            |  |                      | 100.0 |  |               | Wireless                                     
|Carso Telecom B.V. (formerly known as Amov Europa B.V.)                 |  | Netherlands       |  |                      | 100.0 |  |               | Holding Company                              
|Teléfonos de México, S.A.B. de C.V.                                     |  | Mexico            |  |                      | 97.7  |  |               | Fixed-line                                   
|Integración de Servicios TMX, S.A. de C.V.                              |  | Mexico            |  |                      | 97.7  |  |               | Holding Company                              
|Consorcio Red Uno, S.A. de C.V.                                         |  | Mexico            |  |                      | 97.7  |  |               | TelecommunicationsNetwork IntegrationServices
|Teléfonos del Noroeste, S.A. de C.V.                                    |  | Mexico            |  |                      | 97.7  |  |               | Fixed-line                                   
|Uninet, S.A. de C.V.                                                    |  | Mexico            |  |                      | 97.7  |  |               | Corporate networksand internet AccessServices
|Telmex USA, L.L.C.                                                      |  | USA               |  |                      | 97.7  |  |               | Fixed-line                                   



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|                                                              |  |              |  |                      |  |                                   
|------------------------------------------------------------- |  | ------------ |  | -------------------- |  | ----------------------------------
|Name of Company                                               |  | Jurisdiction |  | OwnershipInterest(1) |  | Main Activity                     
|Empresa de Servicios y Soporte Integral GC, S.A.P.I. de C.V.. |  | Mexico       |  | 97.7                 |  | Holding Company                   
|Alquiladora de Casas, S.A. de C.V.                            |  | México       |  | 97.7                 |  | Real Estate                       
|Compañía de Teléfonos y Bienes Raíces, S.A. de C.V.           |  | México       |  | 97.7                 |  | Real Estate                       
|Renta de Equipo, S.A. de C.V.                                 |  | México       |  | 97.7                 |  | Leasing                           
|Telmex Internacional, S.A. de C.V.                            |  | Mexico       |  | 97.8                 |  | Holding Company                   
|Ecuador Telecom, S.A.                                         |  | Ecuador      |  | 97.8                 |  | Fixed-line                        
|Empresa Brasileira de Telecomunicacões, S.A. (Embratel)       |  | Brazil       |  | 95.7                 |  | Fixed-line                        
|Star One, S.A.                                                |  | Brazil       |  | 95.7                 |  | Provider ofSatellite Services     
|Net Serviços de Comunicação, S.A.                             |  | Brazil       |  | 92.2                 |  | Cable TV                          
|Ertach, S.A.                                                  |  | Argentina    |  | 99.5                 |  | Wireless                          
|Claro Comunicaciones, S.A.                                    |  | Chile        |  | 97.5                 |  | Fixed-line/Wireless               
|Páginas Telmex Colombia, S.A.                                 |  | Colombia     |  | 97.8                 |  | DirectoriesProvider               
|Sección Amarilla USA, LLC                                     |  | USA          |  | 97.8                 |  | DirectoriesProvider               
|Publicidad y Contenido Editorial, S.A. de C.V.                |  | Mexico       |  | 97.8                 |  | Provider of CableTelevisionContent
|Editorial Contenido, S.A. de C.V.                             |  | Mexico       |  | 97.8                 |  | Magazine Editor                   



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