Everyone has limits to their self-control. What's wrong with:

- an alcoholic having beer in the fridge but exercising self-control?

- an overweight person having sugar cookies in the pantry but exercising self-control?

- a drug addict having heroin in the glove compartment but exercising self-control?

Also: I remember having GPS on a feature phone in ~2005. You don't need a smartphone for that.