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Network benchmarking giant Ookla, which collects data from consumers via their popular broadband and mobile Speedtest.net service, has today published one of the first independent studies of real-world 4G and 5G mobile (mobile broadband) coverage quality on the London Underground. The good news is that it works and exists exactly where TfL says it should.
Boldyn Networks, using kit from Nokia and others, currently holds a 20-year concession deal with Transport for London (TfL), which was signed in June 2021 (here). The agreement allows them to deploy new mobile network infrastructure across the whole Tube (London Underground), DLR and Elizabeth line network.
The project has made good progress over the past few years and is currently expected to complete by around the end of 2026, which makes now a good time to examine whether or not its delivering on its promises. As of August 2026, over 60% of the 121 below-ground stations were live and the rest of the sites are expected to be live by year-end.