My iPhone 4s won't let me turn on wifi connection

Hi, my iphone 4s would not connect to wifi, after having no problems previously.  I turned wifi off under settings & now the phone will not let me switch it on again. I have tried shutting it down, have been stuck since yesterday! Any suggestions?

Hi Lullita.
This is a common problem on iphone 4s using ios 7.
I have had this problem myself.
Try basic troubleshooting : http://support.apple.com/kb/TS1559
If that doesnt help, try this.
Go to youtube and type this " 4s wifi grey" ... You will find a couple of videos describing a method which includes blowdrying your phone and puttin it into freezer. This method does fix your wifi, I know I have tried it myself, and it brought back my wifi and bluetooth, which were greyed out.
But be very careful, this method can damage your device if youre not careful enough. Do this at your own risk.
Hope I helped.
Donnie.

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