Broadband and mobile operators EE (BT) and Vodafone have announced that they’ve extended their 4G network on the London Underground to include six more stations, covering parts of the Central and Northern lines, which reflects a partnership with BAI Communications. This builds on their already live coverage on the eastern half of the Jubilee Line.
At present, BAI holds a 20-year concession deal with Transport for London (TfL), which was signed in June 2021 (here) and allows them to build the new 4G mobile infrastructure itself and to then make it available via wholesale for Mobile Network Operators (MNO) to harness. The goal of this is to cover the entire London Underground with the new network by late 2024 (ticket halls, platforms and tunnels).
The neutral host distributed antenna system (DAS) network, which will end up being supported by hundreds of kilometres of fibre optic cable laid in tunnels for data capacity (fitted outside operational hours), was first trialled on the Jubilee Line (eastern half of the line). The first new sections beyond that are now starting to go live.