S.O.S
Hello, i need some help !
My Brother gave to me a used iPhone 3 GS from UK, the serial number on the box is xx019. For to "format" that iPhone i did the upgrade with iTunes and then the serial number showing on the handset is like this QR12781xxxx the firmware installed is 05.16.05
Is my handset able to unlock ? where can i found a guide for to do that ! do i need to upgrade to 06.15.00 and after to downgrade ? Thanks a lot