Hi guys! I'm hoping someone can provide some help. I have got an iPhone 3GS for my son and have jailbroken it, I need to unlock it as it is currently on orange and he needs it on O2. The phone is on IOS 6.1.6 and I have installed the ipad baseband along with P0sixpwn for untethering and ultrasn0w to unlock the carrier, however after installing Ultrasn0w I get nothing but "No Service" even with the original carrier sim card, I tried downgrading from the iPad baseband and still having the same thing happen. I have jailbroken and unlocked many 3g and 3gs in the past and never had this issue. Can anyone offer some advice please?