I think I got my first smartphone when I was 23, I never use them for anything other than calling, youtube, and basic web browsing
My typing speed on a phone is something like 15 wpm, on a computer keyboard it's 110 wpm
The idea of using a smartphone for anything pleasurable (other than youtube) is totally foreign to me
QR reading should be built into the default camera on most phones. on mine i have to wait a second before it appears.