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O2 tracks and sells what customers are doing on the Tube
If you're with O2 and regularly use the London Underground, you should know that the network is trying to track your phone and pass that information on to advertisers. If that sounds like a huge invasion of privacy, well, in some ways it is -- however, the silver lining is that all of the data is anonymised and aggregated before it's visible to any marketing folk. O2's owner Telefonica struck the deal with Exterion Media last summer, the latter of which owns every billboard on the subterranean transport system. It then came into effect on Thursday, monitoring customers' journeys, app usage and browsing activity over Wi-Fi.
