Funnily enough, if you're shopping for a "kosher phone" you can actually choose between a smartphone with a limited number of apps to fit in with your religious strictures, or an actually bonafide dumb phone.
Though there may be other features of a Kosher phone that don't make it a good choice for somebody who wants a dumb phone but doesn't live within a specific type of insular religious community. I'm not sure.
https://koshercell.org/collections/dumb-phones
Though there may be other features of a Kosher phone that don't make it a good choice for somebody who wants a dumb phone but doesn't live within a specific type of insular religious community. I'm not sure.