While full mobile service on the Underground may still be a pipe dream, Virgin Media has helped connect travellers by serving London's Tube stations with glorious free WiFi. The company has steadily brought more locations online since it launched the service more than two years ago, but today it took to Twitter to celebrate an important milestone in that rollout: 150 connected stations. Wimbledon, Richmond, Morden, East Ham, Barking and Upminster are the latest terminals to offer free WiFi to Virgin, EE, Vodafone, O2 and Three customers, meaning that more than half of the Tube's 270 stations are now online. Passengers can't get enough, either, with more than 2.5 million devices now registered on the network and more than 3 terabytes of data downloaded each day. Waterloo and Kings Cross are the busiest hubs -- no doubt helping overground commuters get their internet fix as they head beneath the streets in order to get to work.