Oi S.A., through its subsidiaries, provides integrated telecommunication services for residential customers, companies, and governmental agencies in Brazil. It operates in three segments: Fixed-Line and Data Transmission Services, Mobile Services, and Other Services. The company offers fixed-line voice services, such as installation, monthly subscription, metered services, collect calls, and supplemental local services; domestic and international long-distance services; broadband Internet access services; subscription television services; and bundled services, as well as owns and operates public telephones. It also provides post-paid and pre-paid mobile voice and mobile data communications services; mobile long-distance services; value-added services, which include voice, text, and data applications consisting of voicemail, caller ID, personalization, text messaging subscription, chat, mobile television, and location-based services and applications; digital trunk services; and advanced voice services and voice portals, as well as leases digital and analog lines for use in private networks. Further, it provides mobile plans to small and medium-sized enterprises; data transmission services comprising interconnection between local area networks, videoconferencing, video/image transmission, and multimedia applications; information technology infrastructure services; data center services; managed services for mobile devices; interconnection and network usage charges, and traffic transportation services for other telecommunications providers; and ISP services, as well as operates an Internet portal and a call center. As of December 31, 2013, it had approximately 655,400 public telephones; and 11.6 million fixed lines in service in Region I and 6.7 million fixed lines in service in Region II. The company was formerly known as Brasil Telecom S.A. and changed its name to Oi S.A. in February 2012. Oi S.A. was founded in 1963 and is headquartered in Rio de Janeiro, Brazil.
2 Andar, Rua do Lavradio, 71, Centro 20230-070 RIO DE JANEIRO