I own a Nokia Lumia 1320. I have installed many Windows 10 Mobile Insider Preview versions so far and never had this problem before installing version 10.1.10586.164. Even though I made absolutely sure that sound is not turned off, I still can't hear it ring when someone calls me. The weird thing is when I modify the ring song I can hear it. In other words it's only happening with incoming calls. Anyone else having this problem?