the government are tapping everyones phones, it's obvious, it wouldn't make sense if they weren't, they only do something if it's serious, like a terror attack, a HUGE drug deal, or they've tracked a persistent dealer, I know as I used to buy from somewhere and one day after I received the call, I saw police cars pulling over slowly to the spot.Maybe someone tipped them off, but they know where you are, especially cause of the oyster card in England