When I’m on a call on RingCentral using my iPhone, holding my phone to my ear (ie not using a headset), my iPhone is supposed to go to black screen. My understanding is that the mechanism for this is the proximity sensor in my iPhone senses when my ear/head is close, and when that happens when I’m on a call, it turns the screen to black so that my ear doesn’t press buttons while I’m on a call. 

I’m on iOS 12, up-to-date with all updates, and I’ve cleaned the proximity sensor and restarted my phone, but still having the same issue. The issue doesn’t seem to be happening with the Apple phone app.

Anyone else having this issue? It’s really frustrating, as my ear ends up doing all kinds of crazy things, including hanging up the call, so I can only use RingCentral with my airpods or on speaker.