Passengers will be able to make calls and go online anywhere on the London Underground by the mid-2020s.
Transport for London (TfL 伦敦交通局) has announced plans for mobile users to have 4G access across the tube network.
The Jubilee Line will be the first to benefit, with the eastern half to get full mobile connectivity on both platform and tunnels from March.
There are already 260 wi-fi-enabled stations on the London Underground and on Tfl rail services.
