Ok. So I've been trying to unlock my dad's 3Gs for the past 2 days now after updating to 4.3.3. I know it changes the BB, so I used redsn0w to change it to the iPad BB. After JB it, I installed ultrsn0w, but it just ends up with no service after searching. I tried almost everything. I toggled the airplane mode, re-installed ultrasn0w, tried different SIM cards, and even restored and re-JB with redsn0w AND pwnage tool. I don't know what else to do. I was hoping you guys could help. Any suggestions?