A:Answer Yes, you can use any carrier as long as they use the specific "frequency" or "type" as the phone. There are two types and you need to make sure that the carrier supports that type on your phone or you can not use it. There is the one for ATT & Verizon (GSM or something like that) and a different one for Sprint. Do some research before you purchase any phone. Also, the "warranty" is not through Apple so you will have to send it in for any issues or return it to the store (and there are no on site replacement).
