+442072474577 UK, England, London, Liverpool Street, Liverpool Street Station, By Stairs To Bus, EC2M 7QH

Liverpool Street station is the scene for quite a lot of facebook flash mod activity. The most famous was set-up by the mobile phone company T-Mobile. Here's that commercial: http://www.youtube.com/watch?v=mUZrrbgCdYc. By the number is for the payphone to the left.