Just to throw this issue into the arena really. Ever since owning the iP4 from launch, I've had this odd issue that crops up every so often. I'm not doing anything (or identified an action) that's making the issue appear, but very randomly, the whole mobile network reception disappears! I just get a continuous "searching..." in the top left. Wi-Fi gets used a lot at work and home to cut back on my data usage. This doesn't drop though, that's why I don't notice the mobile network dropping. The only way I can resolve it is by turning off the phone and back on again. I've not tried re-initialising the network by using the menu to switch from manual to auto. Anyone else had the same problems? Is it worth me contacting AppleCare?