My 3GS exclusively sits in my car and plays music connected via Bluetooth. I also used it traveling to another country, since AT&T would unlock my old iPhone bu

My 3GS exclusively sits in my car and plays music connected via Bluetooth. I also used it traveling to another country, since AT&T would unlock my old iPhone but not my new one. They said the reason was that I was "currently on contract and it's not their policy to unlock contracted phones".