IPhone can't accept or make calls?

My phone was working fine a few days ago. I did not get the phone wet, or damage it in any way.

When I try to answer incoming calls, the phone keeps vibrating like it is still ringing.
When I try to make calls, the phone freezes until the call is 8 seconds in, and no sounds or ringing

Does anyone know what the problem could be?

Perhaps you have the setting on to FORWARD your calls to another number. We find that at each update "random features" magically set themselves - causing a few days of aggravation until we fix them!

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