TL;DR: iPhones automatically alert you with an "AirTag Found Moving With You" notification if an unfamiliar AirTag travels with you over time; Android users get a similar "unknown tracker" alert since both platforms now support cross-platform detection. If you get an alert, tap it to see the AirTag's location history and use the option to play a sound to help locate it; once found, twist open the back and remove the battery to disable it, and contact local law enforcement if you believe you're being tracked by someone.
iPhones automatically alert you with an "AirTag Found Moving With You" notification if an unfamiliar AirTag travels with you over time; Android users get a similar "unknown tracker" alert since both platforms now support cross-platform detection.
What Usually Causes This
This happens when someone places an AirTag in a bag, vehicle, or item belonging to you without your knowledge, relying on Apple's Find My network of nearby iPhones to relay the tracker's location back to them.
What to Do About It
If you get an alert, tap it to see the AirTag's location history and use the option to play a sound to help locate it; once found, twist open the back and remove the battery to disable it, and contact local law enforcement if you believe you're being tracked by someone.
If this looks similar to something else you've seen, it's worth reading How to Tell If Your Bluetooth Devices Are Being Tracked.
This pattern shows up elsewhere too — see How to Tell If Your Car's Infotainment System Is Tracking You.
Frequently Asked Questions
What are the real warning signs?
iPhones automatically alert you with an "AirTag Found Moving With You" notification if an unfamiliar AirTag travels with you over time; Android users get a similar "unknown tracker" alert since both platforms now support cross-platform detection.
What usually causes this?
This happens when someone places an AirTag in a bag, vehicle, or item belonging to you without your knowledge, relying on Apple's Find My network of nearby iPhones to relay the tracker's location back to them.
What should I do about it?
If you get an alert, tap it to see the AirTag's location history and use the option to play a sound to help locate it; once found, twist open the back and remove the battery to disable it, and contact local law enforcement if you believe you're being tracked by someone.
Should I be worried if I only see one sign?
One sign alone (like a slower device) is usually not cause for alarm — most single symptoms have mundane explanations. Multiple signs together, especially unexpected data usage or unfamiliar apps, are worth investigating.