When you’re out running errands with your phone in your pocket, Wi-Fi hotspots have the ability to track your movements and behavior by scanning your Wi-Fi MAC address. A MAC address is a string of characters that uniquely identifies your device on a network. With iOS 8, we’ve introduced an innovative feature designed to protect your privacy by randomizing your device’s MAC address when the device is passively scanning for Wi-Fi networks. Because your MAC address now changes when you’re not connected to a network, it can’t be used to persistently track you. This is in line with Apple’s industry-leading effort to do away with persistent identifiers, and is unique to iOS devices.
Reference:
We’ve built privacy into the things you use every day
http://www.apple.com/privacy/privacy-built-in/
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