My iPhone is working for outbound calls and does properly sound off when searched via "Find my". But calls are not making any sound. If I happen to be looking at my phone I can see inbound calls and pick them up. They're just silent.
The "Alerts" from Phone are set to "Lock Screen". I have been assuming that means that the notifications - including ringing! - are enabled even if my phone is locked. That is what we want.
What might be wrong here?