Iphone 4 keeps on hanging after updating to iOS 5.0 and later to iOS 5.1

My iphone 4 keeps on hanging after updating to iOS 5.0.  I can no longer make and receive calls.  If I am successful in making a call, it will never end even after pressing stop.  The problem still persists even after updating to iOS 5.1.  How do I resolve this problem?

Try a reset by pressing the home and sleep buttons until you see the Apple logo, ignoring the slider. Takes about 5-15 secs of button holding and you won't lose any data or settings.

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