Boldyn Networks Expands Mobile Coverage Above Ground Using TfL Infrastructure

The company behind the rollout of mobile connectivity in London Underground tunnels is now extending its efforts to improve mobile phone coverage on the city’s streets—by tapping into Transport for London (TfL)’s street-level infrastructure.

Boldyn Networks, which is responsible for delivering 4G and 5G signals across the Tube network, is also making use of TfL’s underground ducts—originally installed to connect assets like traffic lights and CCTV systems—to create a new high-speed fibre network across London. This fibre backbone is being used to support broadband services and improve mobile signal strength at street level.

By threading its own fibre cabling through TfL’s existing duct system, Boldyn can roll out small mobile signal boosters—known as small cells—on lampposts, street signs, and other existing street furniture. These compact units provide targeted signal improvements in areas with high mobile usage.

The company has now deployed over 200 small cells in key London locations and says it can add a new site within just three months of receiving an order.

Recent upgrades have brought improved signal coverage to King’s Cross, Waterloo, London Bridge, Old Street, Hyde Park Corner, and the area around The Shard.

As a neutral host, Boldyn builds and maintains the network infrastructure, leasing it to mobile network operators who can use it to enhance their coverage in busy areas—without having to build separate infrastructure themselves.

Theo Blackwell, Chief Digital Officer for the Greater London Authority, praised the initiative:

“This small cell roll-out is a significant milestone to help improve digital connectivity in the capital, and it’s great to see the speed at which this has been installed. London is a vibrant, world-class city and this initiative is another example of how the Mayor’s Connected London programme works with boroughs and telcos so more of London benefits from well-connected areas with better mobile signal as we build a better and more prosperous London for everyone.”

The project forms part of the Connected London strategy, which aims to transform the capital’s digital infrastructure by working collaboratively with local authorities, telecom providers, and public bodies like TfL.