Hi Everyone,
I suffered with this annoying problem until I stumbled upon these solutions:
1) restart your phone from time to time to purge glitches.
2) make sure the mute button (upper, left side of phone, above volume buttons) is off.
if you see orange, it is on.
sometimes it needs to be switched back & forth (once or twice) to sit properly.
3) go to your "general settings" icon
3rd set of boxes down from the top: "Sounds" (hit the right arrow)
2nd set of boxes down from the top: "Ringer and Alerts" (slide to right, to comfortable ringer level)
All done!
Remember: sometimes when I switch to mute & then back to ringer, I have seen my "Ringer and Alerts" slider reset to silent (all by itself)!!! when this happens, go to #3 above & all will be well!
ET
🙂