All mobile networks are currently covered in the Jubilee line tunnels between Westminster and Canning Town, and TfL has confirmed that Bank, Oxford Circus, Tottenham Court Road, Euston, and Camden Town will be the first stations to gain coverage as part of the network expansion.
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The delivery of mobile phone coverage on the London Underground was signed through a concession agreement, which means that BAI Communications will fund the installation at no cost to TfL, while TfL will also earn revenue from the contract over its 20-year lifespan. Since the contract was signed, BAI has been converting the trial network on the Jubilee line to a permanent network before expanding phone coverage across the rest of the London Underground.