Every time there's a discussion about civil liberties, for instance at the moment with ID cards, people always say, why are you worried they can track you by your phone anyway. But that implies that people are always carrying their phones.
I have a phone, I have to for work, and it's very useful outside work as well. I sometimes use it for navigation, and on certain instances I might take it with me if there's a chance I'll need to liaise with someone while out. Super helpful technology.
But surely people aren't taking it to the shops, or on the school run, or out for a walk in the countryside?