I bought the phone new, but had to buy an AT&T sim card from Wal-Mart to make it work with Straight Talk, so transferring your sim card should work fine, and if you need to buy one like I did, it's only $6.88
answered 4 months, 3 weeks ago
Yes it should as long as the sim card you have now is for AT&T. The phone will not need to be unlocked to do this.
This phone takes a micro sim card. If the sim card that you have now is not a micro, you will need to cut it down with a sim cutter.