Exhibit 8.1

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

As of March 31, 2018

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
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