My jailbroken iPhone 3g has no service what's wrong?

I got an iPhone 3g that was for AT&T but I have tmobile so my brother jailbroke and unlocked it for me but it has no service, he has re jailbroken and unlocked it like 3 times using redsn0w and no luck what's wrong please help!

Did you install ultra snow through cydia if not then go ahead and install it… After than it shoud work

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