IPhone 4S Wi-Fi not working - all greyed out?

Please help my phone is utter useless as I use it for work etc and the Wi-Fi is just not working!

I updated to the ios7.04 and since then the Wi-Fi button is greyed out I've tried everything I can think of?!

Please someone help x

There's no reason for that software wise. The only reason is hardware, either you've knocked the phone and the cable has become unclipoed or the Wi-Fi chip has burned out.

Try resetting the network settings on your device.

Settings > General > Reset > Reset Network Settings.

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