TS1559 Why are there so many issues with the iPhone 4S?  The WiFi setting on the 4S becoming greyed out is certainly NOT a rare instance.

Why does the iPhone 4S keep losing the ability to connect to a WiFi server?  This is a repeat issue with one of our phones!

I had the same problem with my iphone 4S, ios 7.1.2. The wifi button was grayed out for some time now. I tried several methods that I found in various forums, including the reset of network settings, airplane mode, fridge and more. NOTHING!
Then I finally did what I wanted to avoid - the heating method, and it worked as follows:
1. iPhone turned on, I held a hair dryer close to it while keeping the screen on and watching it while heating the iphone with the hair dryer.
2. When the temperature warning came up on the screen, I put the iphone aside to cool up in room temperature (shut off the display). I turned it on/off couple of times until I saw that the warning was gone and normal screen came back.
3. The wifi was still grayed out.
4. I then did the network settings reset,
iphone wifi was back to normal!!

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    SP Forsythe 
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    ajreynol 
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    doh123 
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    Wolfpup 
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    SP Forsythe 
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