Iphone 3GS (OS 6.3.1)
This phone has a problem connecting to the phone network. Sometimes it connects perfectly after searching (automatic) a second or two. However at other times the connection peters out and I get 'no service'. When I switch off the phone and re-start it, it tends to connect again to the network, but it doesnt last.
This means that it does work, but it does not work properly. What could be the problem. I would be able to replace parts as I have done so successfully before with a iPhone 3G (for instance the Wi-Fi Antenna and battery).
The problem is not the network, because I have an older 3G phone and if I switch the sim card into this I get a perfect connection.
Any advice appreciated