SIM CARD "Oi" GSM --= Brazil's leading cell phone provider =-- Unlimited FREE incoming calls from anywhere in the world Comes in 2 sizes, Normal and Micro. Remove outer shell to make it Micro. Domestic rates as low as 0.05 R per minute and calls to the US are 0.93 R per minute (about $0.40). An Oi SIM card and Brazilian cellular phone number The Oi network has the best GSM coverage in Brazil