Intermittent "No Service" problem

Every now and again, my iPhone 3G says that it has "no service". It happens in areas that have plenty of service and where my friends' nokias all have service on the same network (optus). Is it possible that this is a problem with my iPhone? If so, how could I prove it to a mac genius? The problem is so intermittent that I couldn't count on it happening at the apple store!
Any other ideas as to what could be going on?
Thanks in advance for your help!

My best guess: this should be an iPhone software problem. Why? I am experiencing more or less the same problem... as a Belgian (European) iPhone owner, on the Belgian Proximus carrier network. All went fine from July 11th until today. Yesterday we made a trip to Paris. It took my iPhone quite a while to automatically connect to a French carrier, but it did! I made and received calls without any problems. Back in Belgium, it kept saying NO SERVICE. The iPhone does detect all carriers available in my area (Brussels) but cannot connect to "my" network/provider. Did a backup+restore and all. Nothing seems to work.

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