My iPhone's wifi turned off and it won't let me turn it back on. What can I do? I've tried turning it off and on, but still nothing.

My iPhone's wifi is grey and won't allow me to slide it into the on position. What do I need to try?

Try This...
Close All Open Apps... Sign Out of your Account... Perform a Reset... Try again...
Reset  ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430
If no joy...
Reset all settings
Settings > General > Reset > Reset all Settings.
This will return all iDevice settings to factory defaults... you will not lose any data.... But you will have to re-enter all of the device settings

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