Oi S.A. (Oi) is an integrated telecommunications service provider in Brazil. The Company is a switched fixed-line telephony services (STFC) concessionaire. It is engaged in the provision of STFC as a local and intraregional long-distance carrier. Its services are divided into three categories: Residential Services, Personal Mobility, and SME and Corporate. It offers a range of integrated telecommunications services that include fixed-line and mobile telecommunication services, network usage (interconnection), data transmission services (including broadband access services), Pay-TV (including as part of double-play, triple-play and quadruple-play packages), Internet services and other telecommunications services for residential customers, small, medium and large companies and governmental agencies. The Company owns approximately 363,000 kilometers of installed fiber optic cable, distributed throughout Brazil.