No sim card error

I assume this is not unlocked and still on AT&T? If so, maybe the SIM card is loose/not functioning properly? If you have the issue on a regular basis, you might be able to stop in an AT&T store to request a new SIM card.

 

Nope, not weird. It's a 3G SIM, but that doesn't mean it has to be used in a 3G handset.

 

yes that happen to me the first week of owning my 3g. Take the sim card out and clean it really good. use a clean cotton t-shirt and your hot breath. clean the copper contacts really good and that should fix it. it may have someones finger print on it or it may just be dirty. after I clean mine I never had that error messsage again.

 

or you could simply walk into any AT&T store and have them replace your SIM card. Its free and they wont charge.