In Settings. Wi-Fi is gray and showing No Wi-Fi. Can't enable Wi-Fi
Did Reset Network Settings under General\Reset\ No change
Turned off the iPone and turn back on, No change
Try the procedure in http://support.apple.com/kb/TS1559 and if that doesn't work,
Settings > Airplane Mode ON and Do Not Disturb ON
Power off and wait 5-10 minutes
Settings > Airplane Mode OFF and Do Not Disturb OFF
That has helped several users.
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