I-phone 4s Cannot connect to wi-fi. The settings have grayed out!

I have updated to IOS 6.0.1. more or less one month now and everything worked fine up until today that I tried to connect to my wi-fi from home. At first it could not find any wireless network. I switched on and of the router and then even turned of and on with no result.

I tried to connect from my laptop to find out if something is wrong with my network connection, apparently everything is working well.

I tried again to switch on the wi-fi settings but this time the settings have grayed out!!!

As I can see a lot of people face the same problem so I can imagine that there is a general problem and its not my device...

Please fix it!!!

Thank you in advance...