Actualice iPhone 4s a ios7.1 no funciona wifi.

Actualice iPhone 4s a ios7.1 no funciona wifi.

I too discovered the grayed out wifi after my update to 7.1 on my 4S, however I did a search myself.  On a Canadian website they recommended the following:
http://www.iphoneincanada.ca/how-to/fix-wifi-greyed-out-iphone4s-ios7/
I did this and then the following:
After taking it out of the refrigerator I then put it in "Airplane" mode, then did a hard shut down by pushing the off button and home button simultaneously, waiting until the apple logo reappears.  Then my wifi showed up, I moved the button to wifi and then turned off "Airplane" mode.  This worked for me after weeks of not having wifi.
I hope this helps someone else who is just as frustrated as I was.

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