Hi I don't know if this is a known bug? I charged my iPhone 4 last night went back the battery was 94% and the signal was searching... Unplugged and hard reset then I got full signal bars but no carrier network name and unable to make calls. Reset network settings then got searching... Again! So turned on 3G data and my signal sprang into life turned it back off and it was fine still! Rebooted phone now stuck Searching... Again. Did the same above signal springs back into life what's up? Seems as if I have to force a signal from my carrier network by enabling 3G then turning it off again. Yet the iPhone 3GS we got on the same network is fine and another phone on the same network is great. Any ideas?