Exhibit 8.1

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



|                                                                  |  |                    |  |                      |   |  |                    
|----------------------------------------------------------------- |  | ------------------ |  | -------------------- | - |  | -------------------
|Name of Company                                                   |  | Jurisdiction       |  | OwnershipInterest(1) |   |  | Main Activity      
|Sercotel, S.A. de C.V.                                            |  | Mexico             |  | 100.0                | % |  | Holding company    
|AMX Argentina, S.A.                                               |  | Argentina          |  | 100.0                |   |  | Wireless           
|Americel S.A.                                                     |  | Brazil             |  | 99.3                 |   |  | Wireless           
|Claro S.A.                                                        |  | Brazil             |  | 99.4                 |   |  | Wireless           
|Claro Chile S.A.                                                  |  | Chile              |  | 100.0                |   |  | Wireless           
|Comunicación Celular S.A. (COMCEL)                                |  | Colombia           |  | 99.4                 |   |  | Wireless           
|TracFone Wireless, Inc.                                           |  | Delaware           |  | 98.2                 |   |  | Wireless           
|Consorcio Ecuatoriano de Telecomunicaciones, S.A. (CONECEL)       |  | Ecuador            |  | 100.0                |   |  | Wireless           
|Compañía de Telecomunicaciones de El Salvador (CTE), S.A. de C.V. |  | El Salvador        |  | 95.8                 |   |  | Fixed-line         
|CTE Telecom Personal, S.A. de C.V.                                |  | El Salvador        |  | 95.8                 |   |  | Wireless           
|Telecomunicaciones de Guatemala, S.A.                             |  | Guatemala          |  | 99.2                 |   |  | Fixed-line/Wireless
|Servicios de Comunicaciones de Honduras, S.A. de C.V.             |  | Honduras           |  | 100.0                |   |  | Wireless           
|Oceanic Digital Jamaica Limited(2)                                |  | Jamaica            |  | 99.4                 |   |  | 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           
|Radiomóvil Dipsa, S.A. de C.V.                                    |  | Mexico             |  | 100.0                |   |  | Wireless           
|Claro Panamá, S.A.                                                |  | Panama             |  | 100.0                |   |  | Wireless           
|AMX Paraguay, S.A.                                                |  | Paraguay           |  | 100.0                |   |  | Wireless           
|América Móvil Perú, S.A.C.                                        |  | Peru               |  | 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
|AM Wireless Uruguay, S.A.                                         |  | Uruguay            |  | 100.0                |   |  | Wireless           
|AMX Tenedora, S.A. de C.V.                                        |  | Mexico             |  | 100.0                |   |  | Holding company    
|Compañía Dominicana de Teléfonos, C. por A. (CODETEL)             |  | Dominican Republic |  | 100.0                |   |  | Fixed-line/Wireless



|(1) | Percentage of equity owned by América Móvil directly or indirectly through subsidiaries or affiliates.
|--- | ------------------------------------------------------------------------------------------------------

|(2) | On November 28, 2008, Sercotel sold 100% of its shares in AMX Santa Lucía Inc. (parent company of Oceanic) to Comcel. As a result, our ownership interest in Oceanic
decreased from 100% to 99.4%.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------