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How is the mobile broadband on your city’s metro system? Great if you commute in Moscow, Rome, Tokyo, Barcelona, Hong Kong or Melbourne. However other cities don’t fare so well. In London, WiFi is available at stations but there is no connectivity in the tunnels. Wired’s Business Editor Katia Moskvitch has been finding out why there are such differences. (Image: Woman on her phone on the train, Credit: Getty images.)