Virgin Media has switched on free Wi-Fi internet at four of London's underground tube stations.

The service has been put in place ahead of the London 2012 Olympic Games and is now live at King's Cross, Warren Street, Oxford Circus and Green Park. A total of 80 stations will be connected by the end of July with Victoria and Euston set to go live tomorrow.

Virgin Media tube wi-fi

Neil Berkett, CEO of Virgin Media said: "This is a truly historic moment as we connect millions of Tube passengers to the wonderful world of the internet for the first time ever."

"Our plans for getting London Underground online were very ambitious from the start and, in less than just three months, we’ve launched a major new service, making London one of the world’s leading connected cities."

By the end of the year Virgin Media will provide Wi-Fi at 120 tube stations across the capital. Users need to register with an email address to use the service on a smartphone, tablet or laptop.

The service will be free to anyone for the summer, after which it will be restricted to Virgin Media customers. Non Virgin Media customers will still get free access to live travel news, Time Out, Spotify and

The Mayor of London, Boris Johnson said: "Our partnership with Virgin Media to make WiFi available on Tube platforms will be of tremendous benefit as building world class connectivity is critical to supporting new businesses and the jobs they create, especially in the high-tech and creative sectors."