Why do I get SIMM Not Installed - when it is?

1-2 time/month I go to use my 3G iPhone and it has an error msg that I have no SIMM card. I no not receive calls or msgs - nor can I send. The fix is simple - I power off the iPhone and restart and the 3G network icon & signal strength both return to normal. But, why do I get this error? Unless I try to use the phone I do not know I have this problem - and anyone that calls goes immediately to voicemail - but I don't know that. My other concern is that this problem is going to increase in frequency. Is there a fix that prevents this? Secondarily, is this a iPhone issue or is this being caused by my AT&T network?

This could be a problem with the SIM card's connection to the iPhone - not being seated properly, or a problem with the SIM card. Have you tried removing and re-inserting the SIM card? If so with no change, stop by an AT&T corporate store explaining the problem and request a new SIM card. There should be no charge for this and the new SIM card can be activated with your iPhone at the store. If no change after this, there is a problem with your iPhone.

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