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2. Vivo (telecommunications company) - Wikipedia

   en.wikipedia.org/wiki/Vivo_(telecommunications...

   Telesp Celular ; Global Telecom (Paraná, Santa Catarina) Norte Brasil Telecom (a.k.a. NBT) (Amazonas, Roraima, Pará, Amapá, Maranhão) Acquired by the joint venture. TCO Celular (Goiás, the Federal District, Acre, Tocantins, Mato Grosso, Mato Grosso do Sul) Telemig Celular (Minas Gerais) New operations in the Northeast region

3. Oi (telecommunications) - Wikipedia

   en.wikipedia.org/wiki/Oi_(telecommunications)

   In 2008, Oi announced it would purchase Brasil Telecom, creating a major Brazilian telecommunications company, already nicknamed "Supertele" or "SuperOi". That takeover required changes in legislation, which at the time prohibited a fixed telephone company from purchasing another fixed telephone company in a different license area.

4. Telephone numbers in Brazil - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Brazil

   14 Oi (formerly Brasil Telecom) 15 Vivo; 21 Claro (formerly Embratel) 23 Intelig Telecom; 25 GVT; 31 Oi (formerly Telemar) 41 TIM; 43 Sercomtel; 65 CGB Voip Informática e Comunicação; Area codes in Brazil are popularly known as "DDD codes" (códigos DDD) or simply "DDD", from the initials of "direct distance dialing" (discagem direta à ...