IOS 5.1 my phone(Iphone 4S) is restarting after I updated my phone. What shell i do?

I made the update today from IOS 5.01 to IOS 5.1. I have an Iphone 4S. After this my phone is restarting after 20 sec. I can not place a call or a message. Acctualy I can not use my phone anymore. What shell i do?

  Try to Reset your device: Press and hold both the Sleep/Wake button and the Home button for at least ten seconds, until the Apple logo appears (ignore the Slide to Power Off option that shows up first).

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