These days navigating modern world relies heavily on apps: banking, shopping, maps, bookings, entertainment, government services, social networking. How challenging would it be to live with just a base ("dumb") mobile device in your pocket? Assuming you have a computer with the internet at home.
Of course, different factors matter: rural/urban area, occupation, family status, health condition, lifestyle choices… So maybe let me put the question like this: Who could
survive in your area for years without a smartphone?