Three and EE will provide 4G and 5G-ready mobile connectivity across the entire London Underground network, following an agreement with BAI Communications.
BAI was awarded a 20-year concession earlier this year by TFL to deliver mobile connectivity on the Underground.
Philip Jansen, Chief Executive of BT Group, 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.
Billy D’Arcy, CEO of BAI Communications UK, added: “The new backbone of connectivity will create a platform for innovation and allow London’s residents and businesses to harness smart city technology, helping to improve urban life and boost the economy.”
BAI anticipates investing more than £1bn across the Connected London programme, with work underway at some of London’s busiest stations, including Oxford Circus, Tottenham Court Road, Bank, Euston and Camden Town.
All stations and tunnels across the Tube network are due to uninterrupted mobile coverage by the end of 2024.