iPhone 6 ringer will not ring

[AlanBB]

I cannot get the ringer to work with incoming calls.  The mute switch is set for ring, and the phone rings when I access sounds/ringer.

[kaebfly]

Have you tried a hard reset? Hold the home button and lock button simultaneously until the Apple appears on the screen.

[fernandobot]

do you see a half moon icon at the top of your screen?