Updated my iphone 4 to IOS 5, can't call out or receive calls

Since upgraded my iphone 4 to IOS 5, when I go to a place there is no network reception in the suburbs and then come back home where there is ,the phone totally can't find the network carrier, although it shows up on the screen.  I try to restarted it so many times. I can't call out or receive any calls. The only thing I can do is go online.
I have to restore the phone so many times to get it to work again.

Try calling your carrier. (US)
Verizon 18009220204
AT&T 18003310500
Sprint 1888114727

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