been named either Telemar Participações S.A. or Oi Participações S.A. However, those plans failed, since there was no consensus between Telemar shareholders. But on March 1, 2007, Telemar rebranded itself to "Oi", unifying all of its companies and services under the Oi umbrella. The company is still legally known as "Telemar Norte Leste S.A.", "Tele Norte Leste Participações S.A." and "Telemar Participações S.A.". Oi owns the brands: Oi Fixo (landline service, formerly Telefone Telemar) Oi Móvel (mobile service, cornerstone of the Oi brand) Oi Velox (ADSL, 3G formerly Velox) Oi Internet (ISP) 31 (long-distance and international calling) Oi Wi-Fi (Wi-Fi access, at home or via hotspots) Oi TV (DTH pay TV) Oi Voip (Voice over IP) In 2010, Portugal Telecom acquired 22.4% of Oi shares. In February 2014, Oi announced it would raise $5.9 billion in a share offering as part of the firm's merger process with Portugal Telecom. In October 2021, Oi delisted its ADRs from the New York Stock Exchange. Subsidiaries Oi Móvel Oi launched its mobile network in 2002 in its license states. It was the first network using GSM in Brazil. Oi has the practice of not calling its phones "cell phones", but rather "Ois". In 2007, Oi started selling only unlocked handsets, focusing on SIM card and plan sales. In October 2007, Oi acquired a license to operate with GSM in São Paulo, where the network went live on October 24, 2008. In December 2007, Oi purchased licenses to operate a 3G network in its area, including São Paulo, but with the exception of the Franca area. That network is expected to go live in 2009. Also in December 2007, Oi announced its purchase of Amazônia Celular, which was a condition of the sale of its sister company, Telemig Celular, to Vivo. Oi Internet Oi Internet is an ISP that was launched in 2004. Oi Internet started services with a promotion that offered 31% off the dial-up connection costs on the subscriber's bill. However, Anatel, the Brazilian telecom regulator, did not allow this practice. Later, the ISP relaunched the promotion, offering 31% of the dial-up connection costs deposited in the subscriber's bank account or twice of that on a prepaid Oi phone. The Oi Internet dial-up dialer can send SMS messages to Oi phones. In early 2005, Oi Internet launched its broadband services, initially available only for Oi's Oi Velox DSL subscribers, but now also