Exhibit 8.1

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

As of March 31, 2012

Name of Company	Jurisdiction	Ownership Interest(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
Amov Telecom, S.A. de C.V.	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)	Colombia		99.4	Wireless
Megacanales, S.A.S.	Colombia		99.4	Cable TV
The Now Operation, S.A.S.	Colombia		99.4	Services to Cable TV Provider
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
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.	Peru		99.6	Fixed-line/ Cable TV
Claro Panamá, S.A.	Panama		99.7	Wireless
Carso Global Telecom, S.A. 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		97.2	Fixed-line
Integración de Servicios TMX, S.A. de C.V.	Mexico		97.2	Holding Company
Alquiladora de Casas, S.A. de C.V.	Mexico		97.2	Real Estate
Compañía de Teléfonos y Bienes Raíces, S.A. de C.V.	Mexico		97.2	Real Estate
Consorcio Red Uno, S.A. de C.V.	Mexico		97.2	Telecommunications Network Integration Services
Teléfonos del Noroeste, S.A. de C.V.	Mexico		97.2	Fixed-line
Uninet, S.A. de C.V.	Mexico		97.2	Corporate networks and Internet Access Services

Name of Company	Jurisdiction	Ownership Interest(1)		Main Activity
Telmex USA, L.L.C.	USA		97.2	Fixed-line
Telmex Internacional, S.A.B. de C.V.	Mexico		97.5	Holding Company
Controladora de Servicios de Telecomunicaciones, S.A. de C.V.	México		97.5	Holding Company
Telstar, S.A.	Uruguay		97.3	Fixed-line
Ecuador Telecom, S.A.	Ecuador		97.5	Fixed-line
Empresa Brasileira de Telecomunicacões, S.A. (Embratel)	Brazil		95.1	Fixed-line
Star One, S.A.	Brazil		95.1	Provider of Satellite Services
Net Serviços de Comunicação, S.A.	Brazil		87.5	Cable TV
Telmex Argentina, S.A.	Argentina		97.3	Services to Corporate Customers
Ertach, S.A.	Argentina		97.3	Wireless
Claro Comunicaciones, S.A.	Chile		97.3	Fixed-line/ Wireless
Claro Servicios Empresariales, S.A.	Chile		97.5	Fixed-line/Wireless
Páginas Telmex Colombia, S.A.	Colombia		97.5	Directories Provider
Sección Amarilla USA, LLC	USA		97.5	Directories Provider
Publicidad y Contenido Editorial, S.A. de C.V.	Mexico		97.5	Provider of Cable Television Content
Editorial Contenido, S.A. de C.V.	Mexico		97.5	Magazine Editor

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