IPhone 4S Grayed Out Wi-Fi iO7

Okay so first things first is my Wi-Fi is grayed out and won't turn back on. I've tried resetting the network setting (which didn't work) tried the reset (holding the home button and the lock button) and I've tried turning it on and off but nothing has worked. It's done this before and my brother fixed it by turning it off and leaving it off and I've tried that again but it hasn't worked. It also doesn't have that heat warning thing where when it gets over heated it will warn you and it doesn't do that at all! It was a contract phone but my sister switched it to pay as you go for me and it only started playing up when my credit and Internet data ran out. Before it grayed out it would keep disconnecting and I know It has nothing to do with the connection because my iPod touch never disconnects and has full bar signal.

Has the phone ever been dropped or otherwise banged around? There's a known problem with the 4S that makes it slightly vulnerable to mechanical shock, which can loosen some contacts inside and stop wi-fi from working. The phone has to be replaced to fix it.

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