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Vivo is the largest mobile phone service provider in Brazil and in South America with over 50 million users. It originated from the merger of several Brazilian mobile phone operations under a joint-venture owned equally by Portugal Telecom and Spain's TelefÃ³nica. Most of Vivo's network was initially IS-95/cdmaOne based, although there were parts of it that were still analog AMPS and parts using TDMA (IS-136). These are all being converted to GSM since 2006. The CDMA network is being gradually converted to CDMA2000 in the major cities, where the company now provides mobile Internet access. The Vivo brand was launched on April 13, 2003.