[jussij]

Dumb mobile phones still have SMS, so 2FA still works and since it is a telephone, talking to friends and family is also possible. I suspect the reasons the OP gave up on the smart phone was to get away from all of those phone apps.

[_Algernon_]

You probably shouldn't use SMS based 2fa. It's much worse than the alternatives.

[Mordisquitos]

While SMS-based 2FA may be worse than the alternatives, it is clear that the previous commenter has decided that having a smartphone is much worse than the alternatives.

Unless their financial institution offers a non-smartphone 2FA option, such as a PIN-based card reader[0], having to use SMS-based 2FA is a reasonable price to pay.

[0] https://en.wikipedia.org/wiki/Chip_Authentication_Program