Why does my iPhone 4S keep saying CALLING and nothing happens?

Ever since I updated my iPhone 4S to IOS 6.0.1, sometimes when I start to make a call, the screen says "CALLING… " for a long period of time. When I hit END CALL, it just freezes up and continues to say "CALLING… ". The same thing happens when trying to end a call. I press END and the screen says "CALL ENDING… ". The call will actually end, but the screen still says "CALL ENDING… " and I'm unable to make another call. The only cure I've found for both these problems is to restart my phone. It's getting more frequent and I'm getting extremely frustrated with the whole thing! Anyone have a suggestion or a fix?

Try restoring it then applying the update again.

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