Why would my phone ring sometimes and not other times?

I

iMore Question

My phone is on ringer. The volume is all the way up. Intermittently, the incoming call will not ring. I would say it happens about 20-25% of the time. At the other end the person goes directly to voice message. I am not on the other line. I will look down to see that somebody called but the phone did not ring. What could be causing this?
 

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