Exhibit 8.1

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

As of March 31, 2017

Name of Company	Jurisdiction	Ownership Interest		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		100.0	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

Name of Company	Jurisdiction	Ownership Interest		Main Activity
Claro Servicios Empresariales, S.A.	Chile		98.2	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
Telekom Austria Aktiengesellschaft	Austria		51.0	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 Network Integration 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 and Internet 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		68.5	Information Technology
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 Cable Television Content
Editorial Contenido, S.A. de C.V.	Mexico		98.4	Magazine Editor
Claro S.A.	Brazil		97.7	Fixed-line/Wireless/Cable TV
Star One S.A.	Brazil		97.7	Satellite Services Provider