To communicate with a Wi-Fi network, a device must identify itself to the network using a unique network address called a Media Access Control (MAC) address. If the device always uses the same Wi-Fi MAC address across all networks, network operators and other network observers can more easily relate that address to the device's network activity and location over time. This allows a kind of user tracking or profiling, and it applies to all devices on all Wi-Fi networks. To connect to Wi-Fi at UND, users must disable this option. This is only required for UND networks. iPhone & iPad Open the Settings app, then tap Wi-Fi. Tap the More Info button next to a network. Tap to turn Private Wi-Fi Address off or on. If your device joined the network without using a private address, a privacy warning explains why. Apple Watch Open the Settings app, then tap Wi-Fi. Tap the name of the network you joined. If you haven't joined the network yet, swipe left on its name and tap the More button . Tap to turn Private Address off or on.