iPhone not receiving calls

Same problem here. The issue isn't that the phone isn't ringing or vibrating - the call is not even registering as coming through. Some of my calls come through fine, phone rings and all is well. Other times, I'll suddenly get the voicemail ping. When I look at the call history, there is no record of anyone just calling me - and yet, someone did because they left a voicemail.

This nonsense of being told it's user error (check do not disturb, check that the switch on the side is not turned off, etc) is just that nonsense. If that was a problem none of the calls would come through. And if the ringer was turned off, I would still have a record of the call being received.

My cell phone is my business line and missing calls is not an option. I have one call that comes through the same time every week - and that one didn't ring last week. The client was upset because he believed I wasn't in the office to receive the call. Not true. I was - the phone never rang and I only realized he tried to call when I got the voicemail sound. Which proves that the sound is turned on - or I wouldn't have heard that.