My iPhone 4 will not connect to AT&T, Any ideas on the problem?

As I got out of my 4:00 class I notice my phone was "searching" for a network.
As I walked to my car it displayed a message that says "Restore Needed: iPhone can't make or receive calls. Restore from iTunes." So I went home and backed up my phone and restored my phone and restarted it and it will not find a network. We have paid our bills and I take very good care of my phone. It is an iPhone 4 and it has never done this to me before. Could it be a SIM Card problem or something? Any advice would be great.

Use another phone and call AT&T customer service and they will fix your problem.

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