I can't seem to get my iPhone 3G to unlock?

I have an iPhone 3G that I have jailbroken and installed the iPad baseband (6.15.00) using redsn0w 0.9.6b6. I have installed ultrasn0w. Allowed the phone to respring. It will not locate my T-Mobile service. I have rejailbroken it twice both times reinstalling the iPad baseband. I have tested the sim card in other unlocked iPhone 3Gs and it works perfectly. It starts out with 1 bar of service, then goes to searching, then says no service. Please any help would be greatly appreciated!

Check the unlock guide on youtube.

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