Can confirm. My phone got kicked off when they started sunsetting 3G. They called me (on said phone with no service lol) and said I needed a new phone. I said "no I don't, put me back on the network". We went back and forth, then they forwarded me to the tech department

The tech says "you need a new phone". I said "no I don't, I have all but one of the new bands and others with my phone have already gone through this process with you guys". He said "you can't believe everything you read online", I said "be that as it may, I looked at the specs for both my phone and your network, and it meets the requirements"

He starts telling me there's nothing he can do on his end, I say he just has to find an override to stop blocking my phone. He says he doesn't have any options like that, I promise him it's there

After getting tired of going in circles, I say if he doesn't know how to do it he needs to ask someone or pass me to a higher tier. Surprise surprise, my phone instantly shows bars and he tries to gloss over the whole thing

This exactly, as long as your phone has at least one frequency band of the provider, then it will at least connect to their network and allow you to access data. Calling seems to be a whole different thing, though, because it requires something with IMS.