No signal after dock connector change. Why?

Hi guys n dolls! I need help! I have a iPhone 3gs with iOS 4.3.3 Firmware 06.15.00. Jailbroken with redsn0w and unlocked with ultrasn0w. It did work perfect in the begining but then i dropped the poor little thing in the floor so the phone and wifi signal disapeared. I have changed dock connector now and i have my wifi signal back without problem. BUT when i try to connect to my carrier i get a message that my carrier isnt available anymore " Network Lost Your selected cellular network is no longer available. You can choose a diffrent network in settings." When i update the carrier list my operater is there and choosen but it still says no signal. What to do?? I've tried to re-jailbreak, i have reseted just about everything and so on. Please help me, i really miss my little friend!!