Motofone F3 is my current phone. I've been using it for 2.5 years now. It does nothing but make calls. No other wireless signals (no bluetooth, no wifi, no G

Motofone F3 is my current phone. I've been using it for 2.5 years now. It does nothing but make calls. No other wireless signals (no bluetooth, no wifi, no GPS). About as small of an attack surface as a GSM device can have, I think.