Phone won't get service

I have a motorola MPx200 smartphone with cingular service and have been using it for about 7 months now and for some reason this weekend it can't find a network. My phone continuously says no service and I cannot make a call or receive anything. Any ideas on what could have happened.

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I'm not very familar w/your phone but if it's like most moto's you should be able to do a manual network search in your settings. If that doesn't work (even though you most likely ahve already tried this) do a power cycle it should look for the strongest singnal/closest tower in your area. and if that doesn't work call your provider and ask if their doing any work in your area or if a towers down - any known issues in your area.