> To do this, your device is shouting to the world a ton of your personal information in something called a probe packet. A probe packet contains the MAC addres

> To do this, your device is shouting to the world a ton of your personal information in something called a probe packet. A probe packet contains the MAC address as well as the list of all the past Wi-fi networks that your device has tried to join before, which can reveal a lot about you! In the 2010s, maybe. Nowadays MAC address randomisation is the norm and past WiFi networks are not broadcast anymore.