High-Speed Mobile Coverage Reaches New Stations and Tunnels on the Tube

More stations and tunnel sections across London’s Underground network now offer high-speed mobile connectivity, with Transport for London and Boldyn Networks confirming that coverage has expanded to include the first stretches of the Circle and District lines.

Alongside the fully connected Elizabeth line, completed in December 2024, mobile coverage is now available at 62 of the 121 Tube stations that are classified as underground. These stations have 4G and 5G access across ticket halls, passageways and platforms. Recent additions include Euston Square, Cannon Street and Battersea Power Station, while locations such as King’s Cross St Pancras, Gloucester Road, Warwick Avenue and Vauxhall are expected to follow in the coming months.

Progress has also been made inside the tunnels themselves. Sections of the Circle and District lines between Blackfriars and Cannon Street, and between Notting Hill Gate and Bayswater, are now live. TfL and Boldyn said further tunnel sections will be brought online during 2026, with most of the Northern and Metropolitan lines expected to have tunnel coverage by the end of summer next year.

All four mobile network operators – Three UK, EE, Vodafone and Virgin Media O2 – are participating in the rollout, which forms part of a wider commitment by the Mayor of London and TfL to extend mobile connectivity across the capital’s transport network. The infrastructure will also support the Emergency Services Network, designed to give first responders access to live data, images and critical information during incidents once fully operational.

Work is continuing to extend 4G and 5G coverage across the entire Tube, Docklands Light Railway, Elizabeth line and the Windrush line between Highbury & Islington and New Cross. After full interoperability testing was completed across Tube lines in 2025, design and early testing is now underway on the Windrush line and DLR. Installation work has already begun at Cutty Sark, coordinated with planned escalator works to speed up delivery.

Engineers will continue working through 2026, focusing on remaining sections of the Circle and District lines, as well as the Victoria, Jubilee, Bakerloo and Piccadilly lines. Work is also progressing outside central London, where shorter tunnelled sections require individual treatment. TfL and Boldyn said they remain on track for full Tube network coverage by the end of 2026.

Isabel Coman, Director of Engineering and Asset Strategy at TfL, said:

"It's great to see further progress in our goal to introduce high-speed mobile coverage across our Tube network. The latest stations and tunnels going live means that we are on a clear path towards having 4G and 5G mobile coverage across the whole network by the end of 2026. Engineers are working hard overnight during the limited engineering hours to deliver this programme and we hope that customers enjoy benefitting from being able to stay in contact with friends and family, shop online and stay on top of the latest news and sports results while travelling across London."

Nick Hudson, Chief Operating Officer for the UK & Ireland at Boldyn Networks, said:

"Our long-term partnership with TfL to extend reliable 4G and 5G mobile coverage across the London Underground is grounded in improving everyday journeys for millions of people. A project of this scale demands extraordinary engineering effort and close-knit collaboration with TfL, with work often carried out overnight in one of the world's most complex transport networks. We're immensely proud of what's been achieved so far, and each section completed brings us closer to our goal of creating a more connected London for those who visit the city and those who call it home."

Deputy Mayor for Transport Seb Dance said:

"I am delighted to see the promise the Mayor made of delivering 4G and 5G across the London Underground continuing to progress, with Euston Square, Cannon Street and Battersea Power Station joining an ever-growing network of lines and stations with full connectivity. This means Londoners and visitors can now access the latest travel information or social media, check their emails, make calls, and stream videos whilst on the move underground. Growing numbers of underground Tube stations now have 4G and 5G services, with more to come as we continue to build a better London for everyone."

City of London Corporation Policy Chairman Chris Hayward said:

"The City of London is one of the most important financial centres in the world, the economic heart of the United Kingdom, and London's central business district, so we welcome Transport for London's continued expansion of high-speed mobile coverage across the Square Mile. With around 8,700 residents, 21 million visitors annually, and home to more than 678,000 workers, it is more important than ever that we have reliable connectivity. As part of our Destination City vision, the expansion of 5G will help the Square Mile remain a globally attractive place for businesses, attract workers back to the office, and be a place that people want to live, work, learn and explore."

Image: Transport for London