Well I just received a used Iphone 3g from a friend. I went through the task of fixing the 1015 error and getting it functional, then installed cydia with Redsnow. But now the problem is the phone reads no service when entering the sim card. I have tried the airport mode trick, resetting the network settings etc with no luck. What am I doing wrong? I am on 4.2.1. Am I mistaken, is it even jailbroken? Can anybody help on this issues 