Three and EE have said that they will partner up to bring 4G to the tube.
Stations including Oxford Circus, Bank and Camden Town will have 46 by the end of 2022. The rest of the underground will take a further two years.
Mayor Sadiq Khan commented: “This will make a huge difference to passengers, allowing them to make calls, read emails and check travel information while on the move.”
BT Group’s chief executive Philip Jansen said: “This deal puts BT at the heart of plans to help London digitally leapfrog its rivals and maintain its status as a world-leading destination for tourists and businesses, as well as a home to millions of citizens.”
“Our investment in the capital is part of our mission to digitise the entire UK, as we build like fury to expand our fibre and mobile networks further and faster than anyone else.”