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In my experience, the wifi icon being greyed out can often mean the hardware on your device is no longer functioning. There are plenty of cases of this, seemed to happen most to 4S phones on upgrade from ios6 to 7 but also to iphone 5 as well. Not generally fixable despite people trying crazy things like blowing hair dryer down the headphone socket etc.

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I'm definitely hoping that's not the case... I did have this "no wifi" experience happen once before with this phone on, I think, iOS 6, and I did the "Reset Network Settings" trick and it worked again.

EDIT: After installing iOS 8.1.1, I have wifi back... for now. :)

EDIT 2: Gone again after a reboot, which I did because wifi died. I believe it may have actually crashed my cable modem/router before I rebooted it.

The har dryer + fridge trick actually worked for me, but 3 days later the problem came back again. I thought the OP would be about that issue since it is more similar of the WiFi being fried for real.

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