It's entirely possible to build a 'dumbphone' with a nano sized linux SBC(like a Pi zero) and a 4G add-on board. You'd really have to want to do this though, b

It's entirely possible to build a 'dumbphone' with a nano sized linux SBC(like a Pi zero) and a 4G add-on board. You'd really have to want to do this though, but it would be a good learning project.