I had the problem also. Called for assistance and was told I would need to do a factory reset, which we did but it still did not work. Support person told me the only thing left to do was to get a new phone (wrong). I then looked online for others who had similar problems. Other people with this problem said that they took the back off the phone and pressed and tapped hard on the "M" logo. I have a Moto G 3rd Generation phone. The phone will now ring again.