Exhibit 8.1

LIST OF CERTAIN SUBSIDIARIES OF AMÉRICA MÓVIL, S.A.B. DE C.V.

As of March 31, 2016



|                                                                        |  |                    |  |                   |  |                                
|----------------------------------------------------------------------- |  | ------------------ |  | ----------------- |  | -------------------------------
|Name of Company                                                         |  | Jurisdiction       |  | OwnershipInterest |  | 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                
|                                                                       
|Radiomóvil 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 Company                
|                                                                       
|Americel S.A.                                                           |  | Brazil             |  | 99.9              |  | Wireless                       
|                                                                       
|Telecomunicaciones de Guatemala, S.A.                                   |  | Guatemala          |  | 99.3              |  | Fixed-line/Wireless            
|                                                                       
|Empresa Nicaragüense de Telecomunicaciones, S.A.                        |  | Nicaragua          |  | 99.6              |  | Fixed-line/Wireless            
|                                                                       
|Estesa Holding Corp.                                                    |  | Panama             |  | 100.0             |  | Holding Company                
|                                                                       
|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/Cable TV            
|                                                                       
|Consorcio Ecuatoriano de Telecomunicaciones, S.A. (Conecel)             |  | Ecuador            |  | 100.0             |  | Wireless                       
|                                                                       
|AMX Argentina, S.A.                                                     |  | Argentina          |  | 100.0             |  | Wireless                       
|                                                                       
|Telstar, S.A.                                                           |  | Uruguay            |  | 99.9              |  | Fixed-line                     
|                                                                       
|Flimay, S.A.                                                            |  | Uruguay            |  | 99.9              |  | DTH                            
|                                                                       
|Ertach, S.A.                                                            |  | Argentina          |  | 99.8              |  | Wireless                       
|                                                                       
|Telmex Argentina, S.A.                                                  |  | Argentina          |  | 99.7              |  | Services to Corporate Customers
|                                                                       
|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              |  | 99.6              |  | Fixed-line/Wireless            
|                                                                       
|América Móvil Perú, S.A.                                                |  | Peru               |  | 100.0             |  | Wireless                       
|                                                                       
|Claro Panamá, S.A.                                                      |  | Panama             |  | 100.0             |  | Wireless                       
|                                                                       



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|                                                              |  |              |  |                   |  |                                               
|------------------------------------------------------------- |  | ------------ |  | ----------------- |  | ----------------------------------------------
|Name of Company                                               |  | Jurisdiction |  | OwnershipInterest |  | Main Activity                                 
|Carso Telecom B.V. (formerly known as Amov Europa B.V.)       |  | Netherlands  |  | 100.0             |  | Holding Company                               
|                                                             
|Telekom Austria Aktiengesellschaft                            |  | Austria      |  | 59.7              |  | Holding Company                               
|                                                             
|Teléfonos de México, S.A.B. de C.V.                           |  | Mexico       |  | 98.7              |  | Fixed-line                                    
|                                                             
|Integración de Servicios TMX, S.A. de C.V.                    |  | Mexico       |  | 98.7              |  | Holding Company                               
|                                                             
|Consorcio Red Uno, S.A. de C.V.                               |  | Mexico       |  | 98.7              |  | Telecommunications NetworkIntegration Services
|                                                             
|Teléfonos del Noroeste, S.A. de C.V.                          |  | Mexico       |  | 98.7              |  | Fixed-line                                    
|                                                             
|Uninet, S.A. de C.V.                                          |  | Mexico       |  | 98.7              |  | Corporate networks andInternet Access Services
|                                                             
|Teninver, S.A. de C.V.                                        |  | Mexico       |  | 98.7              |  | Leasing                                       
|                                                             
|Telmex USA, L.L.C.                                            |  | USA          |  | 98.7              |  | Fixed-line                                    
|                                                             
|Empresa de Servicios y Soporte Integral GC, S.A.P.I. de C.V.  |  | Mexico       |  | 98.7              |  | Holding Company                               
|                                                             
|Alquiladora de Casas, S.A. de C.V.                            |  | Mexico       |  | 98.7              |  | Real Estate                                   
|                                                             
|Compañía de Teléfonos y Bienes Raíces, S.A. de C.V.           |  | Mexico       |  | 98.7              |  | Real Estate                                   
|                                                             
|Renta de Equipo, S.A. de C.V.                                 |  | Mexico       |  | 98.7              |  | Leasing                                       
|                                                             
|Telmex Internacional, S.A. de C.V.                            |  | Mexico       |  | 97.8              |  | Holding Company                               
|                                                             
|Controladora de Servicios de Telecomunicaciones, S.A. de C.V. |  | Mexico       |  | 98.4              |  | Holding Company                               
|                                                             
|Hitss Solutions, S.A. de C.V.                                 |  | Mexico       |  | 68.9              |  | Information Technology                        
|                                                             
|Ecuador Telecom, S.A.                                         |  | Ecuador      |  | 98.4              |  | Fixed-line                                    
|                                                             
|Claro Comunicaciones, S.A.                                    |  | Chile        |  | 98.2              |  | Fixed-line/Wireless                           
|                                                             
|Sección Amarilla USA, LLC                                     |  | USA          |  | 98.4              |  | Directories Provider                          
|                                                             
|Publicidad y Contenido Editorial, S.A. de C.V.                |  | Mexico       |  | 98.4              |  | Provider of CableTelevision Content           
|                                                             
|Editorial Contenido, S.A. de C.V.                             |  | Mexico       |  | 98.4              |  | Magazine Editor                               
|                                                             
|Claro S.A.                                                    |  | Brazil       |  | 96.2              |  | Fixed-line/Wireless/Cable TV                  
|                                                             
|Star One S.A.                                                 |  | Brazil       |  | 96.2              |  | Satellite Services Provider                   
|