How to know if an AirTag or other tracker is following you

Updated October 23, 2026 · 9 min read

Your phone is the first tracker detector to check. iPhones and Android phones both warn you when an AirTag or a compatible tag that is away from its owner keeps moving with you. Those alerts are worth keeping on, but they can take hours, they don’t cover every tracker, and no phone can sense a cellular GPS tracker hidden on a car.

In short:

  • Keep tracker alerts on, and don’t dismiss one you don’t understand.
  • To check right now: on Android, run Scan now; on an iPhone, use a Bluetooth scanner app.
  • Search your bags, your coat and your car by hand, because phones miss things.
  • If you find a tracker and think someone you know placed it, plan for your safety before you remove it.

Already got an alert? Start with what to do when an AirTag is detected near you.

What kinds of trackers are there?

Two very different kinds, and a phone helps with only one of them.

Bluetooth tags are small, battery-powered and sold for finding keys and bags: AirTag, Tile, Samsung Galaxy SmartTag, Chipolo, Pebblebee, Motorola’s moto tag and other tags on Google’s Find Hub network, which Google called Find My Device until 2025. EFF explains that they have no GPS. They piggyback on nearby phones to report their location to the owner, so they are accurate wherever their network has plenty of phones. NNEDV notes that they can last for months without recharging.

Cellular GPS trackers combine GPS with a mobile data connection. SlashGear sorts them into battery-powered, hardwired and plug-in units. Plug-in trackers go into the car’s OBD-II diagnostic port, and battery units can be attached with a magnet. NYU researchers (USENIX VehicleSec 2025) say perpetrators often use them to follow drivers, helped by their low cost, easy availability online and small size.

Some tracking needs no device at all. NNEDV points out that anyone with access to your Apple or Google account can see your phone’s location.

Will my iPhone warn me about a tracker?

Yes, for many of them. An iPhone alerts you when an AirTag, a Find My network accessory, some AirPods or, since iOS 17.5, a compatible tracker from another maker is separated from its owner and seen moving with you over time. The alert reads “AirTag Found Moving With You” or “[Product name] Found Moving With You”.

The alerts depend on five settings, so check them now:

  1. iOS 17.5 or later.
  2. Settings > Privacy & Security > Location Services on, and under System Services, Significant Locations on.
  3. Bluetooth on.
  4. Settings > Notifications > Tracking Notifications > Allow Notifications on.
  5. Airplane Mode off.

Past alerts are listed in Find My: tap Items, then Unknown Items Detected with You at the bottom.

What an iPhone doesn’t have is an on-demand scan. EFF says you cannot manually search for AirTags from an iPhone without a separate app.

Apple also doesn’t publish a list of compatible trackers from other makers. When Apple and Google announced the shared standard in May 2024, Chipolo, eufy, Jio, Motorola and Pebblebee committed that future tags would be compatible; Tile was not among them. In EFF’s testing, the new compatible models weren’t always detected. Tile’s own app has a Scan and Secure feature for finding unknown Tiles, but EFF notes that a Tile in anti-theft mode is hidden from it.

Will my Android phone warn me?

Android 6 and later sends unknown tracker alerts for Find Hub network tags, headphones and Apple AirTags, Google says. Unlike an iPhone, it can also scan on demand:

  1. Open Settings.
  2. Tap Safety & emergency > Unknown tracker alerts > Scan now.

The scan takes about 10 seconds and lists only trackers that are near you and separated from their owners. Google adds that you get at most one alert per tracker per day, and that past alerts are deleted after 48 hours.

Samsung also added an Unknown Tag Search for Galaxy SmartTags to its SmartThings app in 2021, for Galaxy phones.

One caution: a 2025 study (Gerhardt et al., USENIX Security) found unwanted tracking notifications “significantly more reliable and timely on iOS than on Android”. On Android, run a manual scan whenever you’re unsure.

How long does it take to get a tracker alert?

Longer than most people expect. Apple and Google both say you have to move with a tracker over time before an alert appears, and neither publishes a time.

Northeastern University researchers measured it (PoPETs 2023), testing AirTags with iOS 16.1.2 and AirTag firmware from December 2022:

  • In the daytime, alerts took about eight hours.
  • After 11 p.m., they came within about 30 minutes on average.
  • With Significant Locations turned on, alerts came within 10 minutes of arriving at a frequently visited place, such as home.

Apple may have changed the timing since. EFF’s 2024 guide says an alert can take up to 24 hours, and that an AirTag’s own sound can take up to 24 hours to start.

So if you’re worried now, don’t wait for an alert. Check.

How can I check for a tracker right now?

1. See what your phone already found

  • iPhone: open Find My, tap Items and scroll to Unknown Items Detected with You.
  • Android: open Settings, tap Safety & emergency > Unknown tracker alerts, then tap the tracker alerts button.

2. Scan

On Android, tap Scan now. Run it more than once: Google says several scans improve accuracy.

On an iPhone, use a Bluetooth scanner app. EFF recommends AirGuard, a free research app from TU Darmstadt that can also watch in the background. Its makers say it notifies you, in about an hour, when it sees the same tracker at least three times at changing locations. EFF adds that it isn’t perfect and sometimes took longer than expected.

Know what any scanner on an iPhone can and can’t tell you:

  • It can name some tags. Tile, Samsung SmartTag and Find Hub network tags broadcast identifiers that apps recognize, and so do Chipolo and Pebblebee tags that use their makers’ own apps. For SmartTags and Find Hub tags, an app can also read whether the tag has been away from its owner. AirGuard’s published source code shows how.
  • It can’t name an AirTag. An AirTag shows up only as an unnamed device, because iOS doesn’t pass Apple’s own data from the broadcast on to apps. No app can tell for sure whether an AirTag belongs to someone near you. EFF suggests scanning away from other people for that reason.
  • It can’t give you a distance. Signal strength gives you “warmer” and “colder”. In a 2026 University College London study (SOUPS), participants struggled to find a Tile by signal strength alone, while trackers they could make play a sound were much easier to recover.
  • It will show plenty of normal devices. Any street or apartment building is full of Bluetooth gadgets, many without a name, that have nothing to do with you.

SpyOff, our upcoming iPhone app, has a Bluetooth sweep like this: it names the tags it can, lists unnamed ones such as AirTags separately, and adds a warmer/colder meter.

3. Search by hand

EFF suggests searching anywhere an object about the size of a US quarter could be hidden:

  • every pocket and the lining of bags, coats and jackets;
  • wallets, phone cases and anything new that someone gave you;
  • bags and toys that travel with your children;
  • your car (next section).

Could there be a tracker on my car?

Cars are a common hiding place. In a survey of 5,253 people by TU Darmstadt researchers (PoPETs 2024), cars were the most common hiding place for misused trackers, followed by backpacks and purses. Look for three things:

  • Bluetooth tags, inside the cabin or outside; EFF mentions behind the license plate. Your phone’s alerts and a Bluetooth scan can find these.
  • Magnetic GPS trackers stuck to steel under the car, in the wheel wells or inside the bumpers. A phone’s magnet sensor can hint at a magnet, but only up close.
  • Plug-in and hardwired trackers in the OBD-II port under the dashboard or wired into the car.

Cellular trackers report over the mobile network, and those without Bluetooth are invisible to every phone. The NYU researchers’ detector for hidden 4G trackers analyzes their radio signals with standard commercial hardware and works within about three feet. A phone app can’t do that. For these, a physical search, a mechanic or the police is the check that counts.

The step-by-step search, with what to bring and where to look, is in how to find a GPS tracker on your car.

What can’t a phone detect?

  • Cellular GPS trackers without Bluetooth.
  • Tags that are switched off or have a flat battery.
  • Tags near their owner. Alerts and Android’s manual scan only flag trackers that are separated from their owners, so a tracker whose owner is with you won’t be flagged while they’re nearby. EFF adds that you won’t get alerts for an AirTag shared with you or with someone you’re with.
  • Modified tags. A disabled speaker defeats the sound. The Northeastern researchers built a cloned AirTag that could be tracked in Find My while avoiding the safety alerts.
  • Trackers your phone doesn’t support, such as tags from brands outside the shared standard.
  • Location sharing and account access, which aren’t devices at all. On an iPhone with iOS 16 or later, review them in Settings > Privacy & Security > Safety Check.

Even good tools miss things. In the UCL study, which tested 19 consumer detectors, people using a detector still missed 58.8% of the hidden devices, against 66.7% without one. Apps built to find Bluetooth trackers did far better: participants missed 21.6% of the devices those apps could detect. The researchers found that clear, actionable feedback mattered more than raw sensing. A clean result means these checks found nothing, not that nothing is there.

What should I do if I find one?

  • In danger right now? Go to a safe public place and call 911 or your local emergency number.
  • Plan before you disable it if you think someone you know placed it. EFF warns that whoever put it there will be alerted when you take the battery out. In the US, the National Domestic Violence Hotline is at 1-800-799-7233, or text START to 88788.
  • Document it. Photograph it where you found it, and screenshot any alert, map and serial number. For an AirTag, holding your phone to it shows the serial number and the last four digits of the owner’s phone number. EFF notes that Tile and SmartTag tags don’t offer the same owner details, and only some Chipolo models do.
  • Report it before you turn it off. Google warns that some trackers reset when turned off, after which law enforcement can’t learn more about who owns them. Apple says law enforcement can request information from Apple about an AirTag or Find My accessory.

For AirTags specifically, see what to do when an AirTag is detected near you. For any device you find, what to do if you find a hidden camera covers documenting and reporting.

SpyOff, our upcoming iPhone app, walks you through these checks for a room or a car and says what each one can’t see, including the cellular trackers no phone can detect.

AirTag, AirPods, Find My and iPhone are trademarks of Apple Inc. Tile, SmartTag, Chipolo, Pebblebee, Android and other product names are trademarks of their respective owners.

Questions

Can my iPhone scan for AirTags?

Not on demand. An iPhone alerts you automatically when an AirTag or a compatible tracker that is away from its owner moves with you, but it has no manual scan. For an on-demand check, use a Bluetooth scanner app. On an iPhone, such an app sees AirTags only as unnamed devices and can't tell for sure whose they are.

How long does it take to get a tracker alert?

Apple and Google don't publish a time. In tests with iOS 16 published in 2023, AirTag alerts took about eight hours in the daytime, about 30 minutes after 11 p.m., and under 10 minutes after arriving at a Significant Location such as home. EFF says an alert can take up to 24 hours.

Do tracker detector apps work?

For Bluetooth tags, partly. A scanner app can name Tile, SmartTag and Google Find Hub network tags and give you a warmer/colder signal, but on an iPhone it sees AirTags only as unnamed devices, and no app can detect a cellular GPS tracker. In a 2026 University College London study, apps built to find Bluetooth trackers helped people far more than other kinds of detectors.

Can a phone detect a GPS tracker on my car?

Only if the tracker uses Bluetooth. Many car GPS trackers report over the mobile network and have no Bluetooth, so no phone can sense them. Search the car by hand, especially the OBD-II port, the wheel wells, the bumpers and the underside, or ask a mechanic.

How close does a phone need to be to find a Bluetooth tracker?

Within Bluetooth range, which EFF puts at about 30 feet for AirTags and iPhones. Scan from more than one spot and walk slowly, because the signal jumps around and doesn't translate into an exact distance.

Sources

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