Loss of 3G for a few hours and then back to Normal?????

I have a 3GS 16gb phone and this morning, it lost 3G for about 3 hours or so...I called AT&T tech support and they could not do much and thought it may be a SIM card issue.
Amazingly, before i could visit the AT&T store, things went back to normal and 3G service popped up again....
Here's the question: has anyone else experienced such a thing, plus i use a magnetic clasp hip case, in which i carry my phone. Would using such a magnetic case be the cause of this loss of 3G...
Thanks for the help

This has happened to many people, and it's possible it was a software bug on the iPhone, or that AT&T's 3G network was bogged down and there was a lot of traffic. In all honesty, if it doesn't happen to you all the time don't worry about it.
Anything that is covering up the back of the iPhone is going to lower the signal strength a little bit on the iPhone. I personally wouldn't be using a magnetic case around any electronic device, but that's just me.

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