Most expensive paperweight

I have a Samsung Galaxy s22 Ultra that I purchased through Verizon when I had service with them. About 6 months ago we moved from Verizon to Xfinity to save money but now my phone is the most expensive paper weight I have ever owned. When I am at home I have to constantly stay connected to the Wi-Fi and even then I have a Wi-Fi signal but my mobile data signal is just a big circle with a line through it. Out and about in town it's the same thing except a lot of times there's no Wi-Fi signal. I am not getting calls or texts or any notifications for that matter. Going and picking up groceries is a pain because a lot of times I will pull into the spot realize I have no signal, have to leave again and drive around until I have a signal and then guess what spot might be open when I get back. I drove from Northern Colorado through Nebraska and that was a very scary drive because a lot of times my GPS would go out because my phone would lose signal. Going to Xfinity and asking them for help results in nothing but telling me that I have to reset my phone (which I have done multiple times), or buy a new phone. I think that I will just suck it up and go back to Verizon or to another service and leave Xfinity mobile because even though it's a cheaper rate I'm not getting any phone service for what I'm paying.