TS1559 I've done update IOS version 6.0, in my IPhone 4S, but now I can not activate Wi-Fi icon, it is passive.

I'v done update IOS  version 6.0 in my Iphone 4S, but now i can not activate Wi Fi icon clicking, it is passive.
Previously was installet IOS version 5.1.1.
What should i do?

Try these:
1)
Double tap the home button to bring up active apps at the bottom of your screen.
Tap and hold one of those apps until you get a red circle with white minus sign in it at top left.
Tap the red circle in every app on the bottom.  This closes active apps.
Shut down the phone and leave it off for a couple of minutes.
Turn phone on.
2)
Turn on Airplane Mode
Power down
Leave phone off for 10 minutes
Power up
Turn Airplane Mode off
If this doesn't work, then sync

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