I’m not 100% sure on this but there is always the possibility your carrier could always block devices it does not recognize. I need to look more into this.

Also, it seems that someone has already started to work on bringing mobile Linux “PostMarketOS” to the new Shiftphone. It’s not even released yet. If it’s officially supported, I’ll have a favorite brand for sure. That kind of software support would be unprecedented (except maybe the Librem as mentioned earlier but their hardware repeatability is much lower).