TS1559 my iphone 4s version 7.0.4 wifi turned out grey. i restored my iphone also but didnt work, what shall i do???

my iphone 4s version 7.0.4 wifi turned out grey. i restored my iphone also but didnt work, what shall i do???

ChrisJ4203, thanks very much for your input.  I don't mean to turn this post into an endless debate, but frankly I am still having a hard time believing that the WiFi died as a result of a hardware failure.
My logic might be flawed, but here it is:
While the iPhone 4S got very hot when wirelessly downloading and installing iOS 7.0.4 over the WiFi network, the WiFi chip and antenna had to be functional to complete the wireless iOS update.  Apple was very clear that iOS 7.0.4 is too large to download and install via cellular service.  Accordingly it would appear that any hardware failure had to occur in the few minutes between the download/installation of iOS 7.0.4 and its first use.  That window of opportunity is incredibly small in an otherwise flawless hardware performance.  I am not a big believer in long shot coincidences, so a WiFi hardware malfunction seems highly improbable to me, but not impossible.  A firmware/iOS conflict still seems more plausible to me.
I also don't read much into Apple's "out-of-warranty" replacement offer at $199.  AT&T tells me that anyone walking in off the street (with or without a hardware or iOS malfunction) would receive the same offer.
I appreciate that some iPhone 4S users did not experience any WiFi issues when they updated to iOS 7.0.4, but such difference could easily be explained if Apple used more than one WiFi chip and/or firmware in the iPhone 4S series.  Such an explanation would also account for iOS 7.0.4 (and 7.0.6) not recognizing the WiFi chip after the iOS update.
Still perplexed, but thanks again for your kind efforts to help.
Wonder if I can limp along long enough to spend my money on an Apple iPhone 6 ... but then again I don't want to be anyone's beta-tester.
I am tempted to switch to a Samsung Galaxy or some other smartphone as long as I will be buying new accessories, but frankly I don't want to waste my time learning a new OS or core apps.

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