Finally - Live Bus Countdowns for London on your Windows phone with Bus Checker! The UK's best travel app has landed on Windows phones, so now you can instantly see when your bus is coming, at any of London's 20,000 bus stops! You know those little black 'countdown' boxes on bus shelters? Well, with Bus Checker, you can carry them in your pocket, wherever you are! ATTENTION!!!: Because its not paid version, first you need to download this app to your pc and register it.