UK internet service provider Virgin Media has rolled out its Wi-Fi service to 100 more London Underground (LU) stations.
The move brings the total number of web-connected LU stations to 250, which will provide services that can reach speeds of more than 100Mbps.
Since its launch in 2012, the Wi-Fi service has become an integral part of travelling on the Tube, with around half a million phones, tablets and laptops connecting every day.
According to Virgin Media's data, 20TB of data is used on average each day on the LU Wi-Fi network, which is an increase from 3TB-a-day within the last 12 months.
Each day across the whole Tube Wi-Fi network, an average user consumes around 40MB a day, equivalent to streaming ten music tracks each, or five million tracks.
Being offered as part of a contract between Transport for London (TfL) and Virgin, the service provides free travel information to anyone who connects to the service, including live updates and TfL's Journey Planner.
TfL chief information officer Steve Townsend said: "Wi-Fi is one of many ways we're improving our customers' journeys across the TfL network.
"It will help more of our customers access live travel information, social media and internet browsing while they are on the move across the capital."
TfL noted that customers of Virgin Media and several other major mobile phone providers can also access the wider internet with no extra charge.
Accessible throughout stations, including ticket halls, passageways and platforms, the Wi-Fi service has also been extended to Victoria coach station for the first time.
During the 2012 London Olympics, the Wi-Fi service has been used by nearly half a million people.