Why won't my Wi-Fi bar slide?

I got an iPhone 4s from my Grandmother a while back. It does not have a data plan, I'm using merely as an iPod. Recently my Wi-Fi has just stopped working and in the setting, the Wi-Fi is grey, as if disabled. How do I fix it?

Hold down power and home button until phone turns off. Keep holding them until you see the apple logo, right when you see the apple logo, release the home and power button. This restarts your iPhone. (promise it won't delete anything).

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