The Apple TV app also lets users sign up for third-party services. This is due to an Apple TV Channels feature that is separate from the streaming service subscription. Apple has joined hands with CBS All Access, HBO, Showtime, and others in the US, as well as Arrow TV, Starzplay, BFI Player, and different others in the UK. Users can pay additional money to use those add-on channels with their iTunes account for all billing and payments.