If someone steals your luggage, the AirTag inside it doesn't actually know where it is going.
The little metal disc is completely blind. It has no GPS chip, no cellular antenna, and absolutely no internet connection of its own.
Instead, it relies on an invisible surveillance net built entirely out of strangers.
Inside the device is just a simple Bluetooth beacon and a watch battery.
Every few seconds, it silently broadcasts a secure, cryptographic ping into the open air.
By itself, that localized signal is completely useless.
But Apple quietly programmed every single modern iPhone, iPad, and Mac on earth to act as a passive listening station.
When a thief walks past a random person in an airport, that stranger's iPhone detects the AirTag's ping in the background. Without ever alerting the stranger, their phone uses its own GPS to calculate the exact coordinates, and its own cellular data to silently upload that location straight to your account.
An AirTag has no GPS, no cellular connection and no WiFi
But how does your phone still know where it is?