Can't turn on Wi-Fi on my iPhone? - 1

This morning my home Wi-Fi wasn't working and when I was trying to connect it I accidentally turned my Wi-Fi off on my phone. I turned it back on again, or at least I thought I did? Anyway, I just checked because Wi-Fi wasn't working and it's not switched on, but it's not letting me slide the option over to switch it on. Any ideas? Help!
I have restarted the phone twice and this hasn't solved the problem.

Added (1). I have also restored it and that hasn't worked either.

I know that some Samsung Phones on Android have problems turning on the WLAN drivers, I have this problem but turning the phone on and off always fixes it… All I have to offer, perhaps update Android?