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First, I jailbroke it tethered, and then used Corona on Cydia to untether it. Afterwards, I unlocked it Ultrasn0w. I put my T-Mobile SIM card in, my iPhone searched for a while, and then..."No Service".

I've already tried to following with no success: reset network settings, turning on and off airplane mode, turning off Enable 3G then turning on Data Roaming and then turning Enable 3G on again, ejecting the SIM card and then turning the iPhone off and then turning it on and inserting the SIM card again, reinstalling Mobile Substrate, reinstalling Ultrasn0w, and even rejailbreaking it.

I've been working on this for many, many hours. I need help desperately. Thanks in advance!