Samsung S22 Ultra absolutely unusable on Xfinity Mobile and Wifi

I brought my own device. It's unlocked and Xfinity accepted it. I can't do anything but text. It drops me completely to emergency service. I had a Note 20 Ultra prior that worked perfectly. My guess is that Xfinity actually does not support some of these phones or they're not entirely compatible - or that with certain devices customers getting put at the very lowest level of service which is non existent. It's frustrating. It works just fine on non Xfinity Wi-Fi. It's all Xfinity routers too, not just one.