London mayor Boris Johnson has announced plans to install a mobile phone signal in the capital's underground train network in time for the 2012 Olympic Games.
The mayor is in discussions with the UK's mobile phone companies to share the £100m cost of setting up mobile coverage, according to a report in the Evening Standard.
The move would enable passengers to make calls while travelling underground. Vodafone, O2, Orange, T-Mobile and 3 are all currently in talks over the plan.
Transport for London shelved plans to establish a mobile phone signal on the Underground in 2009, saying that the proposals were "not commercially viable"