Ringer volume
My ringer volume is up in settings as well as on the phone. When I get a call you can barely hear it ring.
iPhone XR, iOS 16
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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.