haha that isn't what I meant, I was pointing to it not being a systemic issue with older iPhones... however if what @hrrsn says is true then it does sound like it is a big issue. I wonder if there are any specifics that lead to the wifi issue, like a certain batch of devices.
I work at a third party Apple repairer. We get 1-5 calls a day about the greyed out WiFi issue. 99% of the time, it's a 4S and we have to refer them to Apple for repair. It can usually be fixed by resoldering the WiFi chip but we can't guarantee the repair, so we don't offer it. Not an iOS 7 problem either, but a common thing is for it to happen after an OS update.
That explains the claim from the deleted post: behind "somebody heats the chip to 300 degrees and then it works" is actually hidden "resoldering sometimes helps." Heh.
