Turns out that mobile phones can predict your behavior. Well not the phones themselves, but a computer program tracking where your phone goes, when you go certain places, and who you regularly come into proximity with.
After tracking you for a while it can pick up patterns of movement and socialisation, and can begin to (eventually quite accurately) predict your future movements etc on the basis of your historical actions.
I wonder how long it will take for the intelligence community to start doing it….