There has been considerable press comment about 3G problems encountered by iPhone users. Apparently many users report that their phones drop the 3G connection suddenly. Yet a group of boffins in Sweden last week reported that the iPhone was no worse (or no better) in 3G performance than phones from other manufacturers.
I don't know. But I do know that I am experiencing strange happenings with my own iPhone and its connection with O2 in the UK. I've noticed that even in areas of known strong reception (for instance, yesterday in a service area on the M3 motorway) I get a full set of signal bars only for the connection to disappear. It's on, off, on like switching on and off a light.
I'm not new to 3G and I've had experience over the past three years with several phones, including Windows Mobile devices. On none of them have I seen this sort of random behaviour. If you have a good signal you keep it. If you have a bad signal, well, it might get better by moving around.
I cannot believe the fault lies with O2 because similar problems are being reported around the world, in particular with AT&T in the USA. It will be interesting to know if other UK iPhone users are experiencing similar problems.