Hi, basically i had a 3.01 iphone 3gs which i jailbroke then i unlocked it with Purplesnow. It was all working fine and then i decided to upgrade to the new 3.1. I followed the tutorial on iClarified and everything went fine, but now my phone has no service in the top left corner, so i cant make or receive calls, making it not a phone anymore! What can i do to fix this? I have tried the original sim card and other sim cards and nothing works. P.S. Is my phone still unlocked as i upgraded to 3.1 (through jailbreak not through itunes).