Why does my iPhone 3Gs stall and then the signal Drops?

Over the past couple of weeks, several times a day, when I am using my iPhone - normally an app, but sometimes declining a call, I can tell the app (or phone) sort of stalls and then immediately all of my bars disappear and I totally lose me signal. Then it says "Searching..." in the upper left-hand corner and maybe after 1 or 2 minutes, it picks up the signal again.
This is getting annoying. I am quite sure it is not a network problem since no one else on the area is experiencing the same thing. It happens on multiple apps, so my guess it is with the phone. I really do not think it is with the SIM card...
Any one have the same problem? I've looked online for posts about similar problems and have found nothing.

Actually, what's probably happened is the signal dropped, the phone is having trouble dealing with it, eventually gives up and then updates the signal icon to show it's dropped.
It's common in networking that apps don't handle certain types of networking problems well or rely on the network layer which may be too aggressive in re-trying before telling the calling app there's a problem. This is tricky stuff whether a computer plugged into a network jack or Wi-Fi or cell tower.
If it happens to you everywhere then drop by Apple but it might just be happening in certain areas due to a cell tower problem.

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