A:AnswerI believe so. Unless you are on some kind of “grandfathered” plan that they don’t offer anymore, you should be fine. Might want to ask AT&T first.
A:Answerfrom what you're stating, The phone you have should be AT&T original GSM meaning it should work with cricket unless AT&T has a block on it being under a payment plan the phone has to be paid in full for them to release the unlock so it's best to own the phone out right and then choose the cheapest carrier to save the most money
A:AnswerBest Buy does not offer shipping to Brazil, and cannot unlock phones. Phones can only be unlocked by carriers. Best Buy does carry Universal iPhones, but they are only unlocked to carriers within the United States. The item that you are posting on is locked to AT&T.