IPhone 3g keeps rebooting itself

yesterday all of a sudden every time i checked my phone i had no signal bars. i figured it was the area i was in. once i left it continued to have no service. i turned it off then back on and since then it keeps rebooting itself. i connected it to itunes to try to restore it and it restores but does not sync. it reboots midway through the process. can anyone help me out?

Well the post says the question is answered - but a quick search on Google for "iphone keeps rebooting" reveals many thousands of people with this problem... including me yesterday!
I seem to have gotten mine fixed... Somehow I managed to get the phone to reboot in recovery mode. This stopped it rebooting, as long as I didn't press the round button. After that, without starting it or pressing ANY buttons I plugged it into my laptop and selected restore. This restores the firmware, but when I tried to then re-sync the songs, it crashed again. I thought it was all over. However... the second time I did indeed manage to re-sync everything - and so far to day, everything seems reasonably stable. Mind you. I have to "reactivate" my phone connection with O2 in the process though... very odd and frankly Apple should be a bit more open about this clearly known issue and tell us what to do... either play around or get straight to a store.
Dixon.

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