London Underground to start tracking all phones using Wi-Fi starting in July

Starting on July 8th, Transport for London (TfL) will start tracking passengers’ phones on the London Underground by default. Wi-Fi access points across 260 of the capital’s stations will track customers using their phones’ MAC addresses, which will allow TfL to see the routes they take through the network as well as through individual stations as they move from platform to platform.

Since the system relies on MAC addresses that phones automatically send to Wi-Fi access points when they try to connect, the only way to opt out of this system is to turn your phone’s Wi-Fi off entirely. However, as Wired notes, TfL will anonymize the data it collects. MAC addresses will be tokenized, meaning they will be replaced with an identifier that...

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