I have done the ring test. Nada.Can I ask you when did you get the phone? Have you tried the piano riff ringtone test?
Thanks!
Anyways it’s a pretty big issue in the apple discussions web:
https://discussions.apple.com/thread/8550004
My phone is a 512 XS Max, on att network, received on launch day, running the latest beta since day 1. It has been flawless.