No sim error on ios 5.1

I updadted my iPhone 4S to ios 5.1. I now get a no SIM error. I have tried the usual ejectin sim, powering off etc

Hi,
First you can try this:
Press and hold power buton and home botton simultaneously untill the apple logo appears and then relese the buttons, as far as I know this resolve some issues, if this it dosen't work try to make a restore from iTunes (use iTunes 10.6)
Let me know if one of this methods works
P.S. I updated my iPhone 4S via OTA and all went well
Kind Regards

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