Iphone won't ring or switch on Wi-Fi?

My iphone won't allow me to receive phone calls or turn on my Wi-Fi, When someone rings me, it doesn't ring or show up a missed call, i can receive voicemails and text messages, but nothing else, also i can't seem to turn my Wi-Fi on, the switch has turnt grey and i can't press it!

Try refreshing your phone if that doesn't work restore it

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