Phone calls intermittently cause the phone to ring
My iphone 10XR intermittently rings when a phone call comes in. What I mean is that the phone will either ring to announce an incoming call or send the call directly to voice mail with no ringing. I have been given or read about online how to fix this problem to no avail.
Could it be a hardware problem? could the phone itself be defective?
iPhone XR, iOS 13