Hi there, i have the Fairphone 4 and i upgraded it with a sd card of 512gb
And i have 4 remaining new battery’s and the phone is quick enough
Is it alright if the phone can get used more than after 2030?
That’s impossible to say.
I still use a Fairphone 1 from 2014. I don’t use it for normal daily use as it doesn’t recieve update, so there is no security.
It will depend on if there is software still getting security updates usable on a Fairphone 4.
Another thing to consider that then probable will run an old OS on the phone and will that cover your need.