The problem is that if i activate 3G i get the message that there is no service. If i disable the 3G it gets the signal back and everything works. I bought the iphone a week ago from a guy and untill this sunday it worked like a charm on 3G. I tried restoring the firmware. Still the same problem. The firmware is 3.1.2. Jailbroken. Software unlocked with ultrasn0w. Baseband is 4.26 . I really hope it's a software problem. Can it be a hardware issue?