[cjs_ac]

Are you the Sisyphus of goalposts or something?

[feurio]

I am willing to be educated; does the average schoolkid carry such a device?

I suspect that the number of kids using not using an app on a device that is aware of its locality is a rounding error.

Tesco* phones on some network's family plan must be 95th percentile.

(* other high street retailers are available)