iPhone 3GS with fw 3.1.2 and BB 04.26 running Ultrasn0w.
I have restored with a custom 3.1.2 to preserve my baseband, install ONLY ultrasn0w and I have full signal with my T-Mo simcard. However I can't make a phone call, send a text, use the web, etc..... Nothing works. Wifi and every other feature works just fine. But nothing GSM related.
Anybody have any clue what to try next?