I have TMobile as my service providor. I was given a IPhone 3gs with firmware 4.1. I used limera1n to jailbreak the phone. Then I installed Cydia and used that to install ultrasn0w to unlock the phone. Now when I put my Tmobile sim in the phone is notices the sim is in there but just stays searching for the network. If I put the sim back into my old phone it sees the network just fine. What could I be missing?