LONDON, ENGLAND - JUNE 02: In this photo illustration, a smartphone displays the 'Uber' mobile application which allows users to hail private-hire cars from any location on June 2, 2014 in London, England. The controversial piece of software, which is opposed by established taxi drivers, currently serves more than 100 cities in 37 countries. London's black cabs are seeking a High Court ruling on the claim that the Uber software is breaking the law by using an app as a taxi meter to determine rates. (Photo by Oli Scarff/Getty Images)
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