Help! I got the iPhone to unlock via iTunes (FINALLY!) and it installed my backup - all applications and contacts etc...and is fully functional - but there is no signal...and it warns me "No signal detected. Signal required to complete activation" -- except I live in the heart of manhattan and ALWAYS have signal in my apartment. My old iPhone has no signal either...but my fiancee's phone (also on ATT) has full bars - so it's gotta be a problem with the iPhone/iTunes...but what? Mark.