I just got a 1st gen iPhone from my brother, and I unlocked it an jailbroken it fine with Redsn0w. But for some reason, it won't send or recieve both texts, or calls. The phone was originally on o2, and I'm trying to use a T-Mobile (uk) sim card, on pay as you go. The firmware is on 3.0 at the moment. Is there anything I've done wrong?