Me again 32GB 3GS. New Bootrom. wk 45 of 2009, so safe to flash with iPad BB. Restored to 6.1.3. Upgraded to iPad BB. Downgraded (using redsn0w) and installed Cydia. Installed Ultrasn0w. No signal. Sigh. I just did this with my 8GB 3gs yesterday, and it's working fine. SO... here's what I've tried - tell me if I"m missing something??? Airplane mode off and on, check. Location Services off, check. uninstall mobile substrate, reboot, install ultrasn0w, reboot, then put in sim - check Reinstall mobile substrate and ultrasn0w, check. Reflash iPad BB and then re-downgrade BB to 05.13.04. I am at a COMPLETE loss. If anyone has any other suggestions, I'd LOVE to hear them !!!