Why doesn't the public TfL_Wi-Fi work?

Public Wi-Fi is available within London Underground and Elizabeth line stations. This service works very well with millions of connections every day.

Free on-train Wi-Fi is also available on the above ground sections of the Elizabeth line in the newer Class 710 London Overground trains. On-train Wi-Fi is not currently available in below ground sections of the Elizabeth line, however Transport for London is actively working to make this available as soon as possible through their concession with BAI Communications Ltd. This concession will also deliver 4G coverage throughout all London Underground tunnels and stations, including the Elizabeth line.