RoamTheWorldCellPhones.com

Cellphone GSM Frequencies: 850/900/1800/1900

(This means you will need a GSM cellphone that will work on 850MHz, 900Mhz, 1800Mhz or 1900Mhz to use it in Brazil.)

Cellular carriers for Brazil

14 Brasil Telecom Celular S.A (Amazonia Celular S/A) (TNL PCS) (oi)

Frequency: GSM 1800
Website: www.oi.com.br

Coverage Map (NONE)

CLARO S.A (Americel S.A.)

Frequency: GSM 900/1800
Website: www.claro.com.br

Coverage Map

CTBC Celular S.A. (CTBC Cellular)

Frequency: 900/1800
Website: www.ctbc.com.br

Coverage Map (NONE)

Sercomtel Celular S/A

Frequency: GSM 900/1800
Website: www.sercomtelcelular.com.br

Coverage Map

TIM Celular S.A. (TIM BRASIL)

Frequency: GSM 1800
Website: www.tim.com.br

Coverage Map

Unicel do Brasil Telecomunicacoes Ltda.

Frequency: GSM 1800
Website: www.meuaeiou.net.br

Coverage Map (NONE)

Vivo S.A. (Telemig Celular)

Frequency: GSM 850/900/1800/1900
Website: minas.vivo.com.br

Coverage Map

If you've used either of these networks or roamed in Brazil, please post about your experience and the cost. Feel free to ask questions.