It’s not that he never gets any calls—he’s just never activated his ringtone. Like a growing number of mobile users, he’s content to leave his phone permanently set to vibrate.
Who would have predicted that just a few years ago? The ringtone used to be a core component of the mobile user experience. You’d get a new phone, and immediately select a ringtone from dozens that came pre-installed. Or you’d download some more, and assign different tones to different people in your life.