What model are you talking about? I'd like a portable Linux device. I was born too early for the N900, and it wouldn't get cellular coverage in this day and age even if I were to buy one...
It has dual SIM capability but if you use that you lose the SD slot.
There is also GerdaOS (instead of KaiOS) and you can run Debian on it. When I get my next phone (which could well be years, this one is now 4 years old and still going strong) I plan on running stock linux on it to see what else you can do with it. I paid about 80 euros for it.