This is how I fixed wifi greyed out on iPhone 4S

It happened to me during a trip to Finland, wifi could not be switched on any more after iOS7.1 update, it was greyed out in control panel, I was not able to use hotel wifi, ... that cost me some Euros. Later I found, bluetooth also not working.
But at home, after running a factory reset with iTunes with no success, I finally found the fix with google, my wifi is now working again ! Lets see, how long it lasts. Its 2 weeks now.
Solution, and this is not a joke:
-Place the iPhone on a soft towel or so and keep it switched on.
-Heat it slowly with a hair dryer from the side with the earphone plug.
-After a few minutes, it warns "temperature" and turns itself off.
-Let it cool down. You then can switch it on (wifi still not working).
-Reboot now by holding home and on buttons until the Apple logo comes back. Thats it !
My iPhone 4S straight away connected to my home wifi......and still does for a couple of days now. Also some guys in this forum confirmed that trick to work.
I try to help with this, but you do it at your own risk. On my friends iPhone 4 this did not help.
I suspect, that it has something to do with the control panel. The error occured after switching wifi and flight mode from there. Currently I do only use the settings app for that. Can anybody confirm that ?

You can also try calling Apple per the article posted, or go to another Apple Store, but if you wifi is grey and those steps don't fix it, you will need service (replacement). Sorry, magic wand is out of batteries and pixie dust is depleted.
Good Luck.

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I just don't understand this at all....

Is it worth paying to have iphone 4s fixed after wifi greyed out

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Some folks think the problem is due to poor solder connections of the WiFi chip on the card. Heating may expand the joints to cause temporary connectivity. The chip itself could be of low tolerance, and the iOS update causes it to fail the threshold. If you have tried the software resets, then the cure is to reflow the solder of the chip to the WiFi card, or to replace the WiFi card. Apple will not "own" this problem, even though it seems to be widespread. Apple offers to renew your contract for a new iPhone at $199. Certain repair shops will tackle this problem, although many local shops will not. In the US try iFix Miami Beach. See them on eBay <http://www.ebay.com/itm/iPhone-4S-Grayed-Out-Wifi-Wireless-Fix-Repair-Service-Tr usted-Specialists-/161160765436?ssPageName=ADME:L:OU:US:1120> for a $69 fix. They fixed my iPhone 4S and returned within a week (even over the Memorial Day holiday weekend). In Europe, I have read about, but have not tried PodMod <http://www.podmod.org> Hope this helps.

TS1398 Got the dreaded no wifi on my wife's iPhone 4S. Wifi greyed out and no luck with the reset network instructions. Why isn't Apple addressing this issue? We are a family of Apple product users, 2 ipads, an ipad mini, 4 iPhones but one isn't working!

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Come on Apple.....get this issue sorted out!

Just out of warranty. This is a software issue. everything was ok until the software update. Apple just need to sort it out.

Why did carefully over heating my 4s restore the wifi function? This, after 2 months of mysteriously grey out wifi buttons, loads of time trying to resolve issue with apple tech only to be told I must pay $199 to repair the problem. I'm disillusioned now

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It has no correlation. You do not have to have an Apple ID in order house an iPhone. An Apple ID is only needed to use iCloud and iTunes & App Store on an iPhone. You can have an iPhone set up as new, no user data whatsoever, and still connect to wi-fi.
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Dear apple, I am really dissapointed with you. Around January 2013, my iPhone 4s 16GB White has hardware issues, which was the Wi-Fi grey out. The wifi grey out means that I can't access the wifi on/off button, and also it has no connection. I have put up

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IOS 6.1.3 hav'nt fix wifi greyed issue

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Lawrence,
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Seriously,
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Thank you APPLE for your great support!!

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We have requirement in which few of the links in are to be displayed as greyed out or disabled in detailed navigation and in navigational pages. This is to stop the users from accessing the link for sometime say for a week or so.
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This is how I fixed wifi greyed out on iPhone 4S

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