It's not the phone. We have (2) here that both do it and my iPhone 13 did it too. That rules out the model at least.
Bottom line, we either have to wait until someone important enough reports this to get it addressed or live with it OR change carriers.
Yea it's annoying but not enough for us to change companies. If someone ever connects with an inside engineer at TMO, we might have a chance. I had a decent guy inside in Chicago that was my go-to for weird stuff like this but he quit like almost all of the decent engineers around. I don't even know where they all go.
Reporting it to Apple seems to do nothing, so advice here is to tell others not to waste your time with a so called Genius Bar appointment.
I mean really, talk about an oxymoron within Apple...
Keep hoping for a carrier update that MIGHT address this issue within the phone but I'm not certain that will fix it.