Unlocked 3G using Ultrasn0w. The iPhone would hang onto a signal while on a call just fine, and stay on full bars. but on standby, the iPhone would always intermittently go to No Service and sometimes even stay that way every 5 seconds after "catching" a signal. What is up? Anyone have trouble? It is 3.0 firmware as well. It doesn't make sense that I can stay on a call and go through places with crappy signal and have it work, but not even stay connected to the tower on standby....AND ITS THE SAME LOCATION TOO!