My iPhone 4 works perfectly normally at home in the UK but every time I travel in Europe I encounter the same problem. This week I am in Malta. When I switched from 'airplane mode' on arrival, the phone searched and joined a local network successfuly. I can send and receive texts successfuly and make and receive calls. I have turned off everything else, so as not to run up huge data charges. The problem is that every minute or so the phone lights up on the unlock screen and flashes a message for a fraction of a second - too briefly to read it - and this runs the battery down very quickly. I have tried a hard reboot with no effect. Has anybody encountered this problem? I am staying with friends and typing this on their notebook.