Apple’s iOS 8 will use a random MAC address each time it scans for nearby Wi-Fi networks to prevent this sort of tracking.īear in mind that each network interface has its own MAC address. A company named Renew London used trash bins in the city of London to track people’s movements around the city based on their MAC addresses. When you walk around, your smartphone scans for nearby Wi-Fi networks and broadcasts its MAC address.
(Free, limited Wi-Fi may also be tracked using browser cookies or an account system.) Change your MAC address and you could get more Wi-Fi.
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For example, an airport Wi-Fi network might offer a free 30 minutes and then ban your MAC address from receiving more Wi-Fi.