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Free Wi-Fi hotspots can track your location, even if you don’t connect to them. This is because your phone or computer broadcasts a unique MAC address.
What distinguishes location-based marketing hotspot providers like Zenreach and Euclid is that the personal information you enter in the captive portal — like your email address, phone number, or social media profile — can be linked to your laptop or smartphone’s Media Access Control (MAC) address. That’s the unique alphanumeric ID that devices broadcast when Wi-Fi is switched on.
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