I cannot switch on the wifi on my iphone 4s

I cannot switch on the wifi on my iphone 4s. The wifi button remains grey and fix. I have updated to IOS 6 since 1 month and this happens only 4 days ago. Can anybody help?

Restart iPhone: Hold down the Sleep/Wake button and the home button together until the apple logo appears then let both buttons go and wait for the phone to restart.

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