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its been doing it for a few weeks now, inside, out side, it doesnt matter. had a quick look on google, and it looks like a few other people are getting it as well.
i have the 3gs, and someone last night on 02 as well with the 4g was getting it as well
Best to report it to O2, could be an issue with your nearest 3G cell (or are you seeing it on both 2 and 3G?)
Cells can sometimes get a sector going faulty, it does normally get picked up but if its fluctuating it may not be alarming