Phone does not ring when watching Facebook videos

Is it possible that the ringtone’s audio may be coming through, however, too low to be heard over the Facebook audio? This is part of the Attention Aware Feature of the iPhone. When the iPhone has your attention while you are looking at the screen (typing, reading websites or working with an app), then it automatically reduces the sound because it knows you are looking right at it so no need to issue loud notifications.

You can turn this feature off if you want by opening Settings ➔ Accessibility ➔ Face ID & Attention ➔ Attention Aware Feature set this to OFF.

Axel F.