No longer able to use wi-fi?

I have suddenly lost the ability to use the wi-fi function on my i-phone 4S. All has been working fine until I notice I wasn't connected to my home wi-fi. When out and about the phone no longer picks up near by wi-fi connections. When I click on settings and select wi-fi, the 'on/off' button displays 'off' and is grey (as in unable to be switched on). Any suggestions?

Try this - resetting the network settings on your phone, but SWITCH YOUR ROUTER OFF before you do the reset and switch it back on after the phone has reset.
http://support.apple.com/kb/TS1398

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