My iPhone 4s won't let me turn the Wi-Fi on (read description)?

I go to setting and the Wi-Fi switch thing doesn't light up, its just grey. It kindof looks like this: image

i plugged it into the computer and it says "download and update" or something like that. Would this fix it?

Sounds like the Wi-Fi radia has failed I would make an appointment to get the phone fixed but it more than likely will have to be replaced

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