Pokémon GO has released new version of the game in Android and iOS and they have made new changes in the game. They have also make a statement in their official Facebook account and they have stated that they have limited to access for unavailable countries. They have also told that they have limited the access from third party services. So you won’t able to play the game if you have download it from unofficial resources and other services like that. Here is the official statement of Pokémon GO about recent updates.
Pokémon GO staff has especially mentioned about Brazil in the game and they have told that the game will be available for the country soon. We hope that Brazilian people will able to play the game as soon as possible.