Yes, "Do not disturb" is off, switch set to Ringer, the volume is way up, and I've checked every single audio tone for each notification setting. It's not the speaker as Youtube and music come through fine. The phone just doesn't want to sound off any notification sounds. Anyone else having this issue? I read some pretty recent issues with 6S owners also having the same, but it sounds like it's not widespread. Between this, the yellow screen, and the rattle sounds.. I am quickly having a bad experience with modern iPhones.