Telefonica O2 Czech Republic, a.s., together with its subsidiaries, provides telecommunications and related services in the Czech Republic and internationally. It offers a portfolio of voice and data services of fixed line and mobile technologies. The company’s activities include public fixed network of electronic communications, public network for the transfer of radio and TV signal, public fixed telephone network, publicly accessible telephone services, other voice services, rental of circuits, transmission of radio and TV signal, transfers of data, and Internet access services. It also provides wholesale services to other operators of public telecommunications networks and providers of public telecommunications services. The company operates a digital network for the voice PSTN, ISDN, and IN services. Its customers include residential, corporate clients, and government. The company was incorporated in 1993. It was formerly known as Cesky Telecom, a.s. and changed its name to Telefonica O2 Czech Republic, a.s. in 2006. The company is based in Prague, the Czech Republic. Telefonica O2 Czech Republic, a.s. operates as a subsidiary of Telefonica, SA.