Sim problem with iphone3gs

Hi guys,
Just thought I'd put this problem out there to see if anyone else has experienced the same & if anyone has any suggestions.
A couple of weeks ago my iPhone started crashing if I used it for a call or text. I could switch it back on shortly after ( usually with the aid of the charger) & it would work for another while, then do the same again. I noticed that afterward the crash the battery power would've dropped from 80/90% to as low as 12%.
The problem persists but now I've discovered that it only happens when my SIM card is in the phone. No sim & the phone works perfectly, apart from calls & texts. O2 think it's a sim reader problem & apple thought it was a software problem so  re- installed the OS. & reset the phone but no joy. It keeps crashing when i try to use the phone. Any ideas?

Unfortunately I haven't found a solution yet. But it is currently with Apple in the form of a bug report - I will post more info when it becomes available. I too have rogue usage stats. Approx half the standby time is usage, even when I don't use it at all!

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