Headquartered in Rio de Janeiro, Oi (formerly Telemar) is a subsidiary of Tele Norte Holding Company (TNL). With its inception in 2002, Oi is the first mobile network operator to establish GSM mobile infrastructures in Brazil. In 2007, the rebranding of Telemar to Oi resulted in the unification of the telecom provider's mobile, fixed telephony, and broadband internet service under Oi as the new brand name. In official terms; however, Oi is still legally known as Telemar Norte Leste S.A.
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During its initial stage, Oi was given the license to provide only voice, data, and interstate long-distance calling services. Later on, the communications provider continued to gain a major foothold in the Brazilian telephony market by adding international long-distance, roaming, and fixed telephony services.
In 2007, Oi continued to expand its mobile service by acquiring a license to deploy GSM infrastructures in Sao Paulo, resulting in the wireless network's acquisition of Amazonia Celular. And in 2009, Oi's acquisition of Brazil Telecom further catapulted the mobile network's dominance in the Brazilian market, serving 41.5 million subscribers to date.
Today, Oi offers both postpaid and prepaid mobile services to Brazil's growing subscriber base, with the prepaid service gaining further momentum as more mobile users shift to prepaid services because of the simplicity of pay-as-you-go charging schemes, requiring no contract-based service plans or regular phone bills.
The Oi logo and the Oi product images are registered trademarks of Oi.