I bought my iPhone 3G a couple of weeks ago off eBay it's jailbroken and unlocked it worked perfect until about 3 days ago it had no service all night then it came back then went again and kept doing it. Now I've had no service for about 9 hours can any one help?? I've tried taking the sim card out put it back in and reinstalled ultrasn0w, also tried switching 3G off. I think it's on version 4.0.1. Someone please help I love my phone lol!