IPhone 4 on IOS 5.0.1 can't make or receive calls or send/receive SMS

Hi there,
Last friday, I noticed that I can't make or receive calls on my unlocked iPhone 4 on IOS 5.0.1. Until then it works fine. I can't neither send or receive SMS. The Internet connection works fine and I can surf the Internet over 3G.
I have test the SIM on my 2G iPhone and the calls works right. I have restore the network settings and I have completely restored (including IOS) the device over iTunes but the problem persist.
Have anyone experienced the same?
Thanks in advance

The resolution to my problem was a new phone. My first trip to the Genius Bar I was asked if I had done a complete restore to factory settings. I did that when I got home and the problem with using the phone was unchanged. I went back to the Genius Bar, described that I had restored to factory settings, and the screen still froze when I tried to either end a call or answer a call. They basically said it must be a hardware problem and gave me a new phone. My phone was 3 months old so it was still under warranty.

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