IPhone won't let me turn on Wi-Fi?

My iPhone won't let me turn my Wi-Fi on like the button is gray/faded and it won't give you the option to turn it on I've checked my whole phone and it's not on airplane mode or anything like that I even reset it but I saw something called "iTunes Wi-Fi sync" is tht going to help me get Wi-Fi back on my phone. And it's updated so there's nothing wrong with it

This should help, hope it does!

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