[octoberfranklin]

This is not a "dumbphone"; those don't exist anymore now that the 3G networks have been turned off.

This "dumb" phone has an entire main-CPU OS, a web browser (!), and then another entire OS on the modem chip (which, of course, runs code which you have absolutely no influence over).

I miss dumbphones.

[Jaruzel]

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.