Periphery How to find hidden Bluetooth devices with your iPhone
Start with what your iPhone already does: it alerts you when an AirTag or another Find My network accessory that is away from its owner travels with you. A Bluetooth scanner is an extra pair of eyes, not a replacement. Periphery lists every Bluetooth Low Energy device near you, ranks them by signal strength, marks some as a Possible tracker with its Trackers filter, and lets you walk toward a strong one with Locate. It cannot see every tracker, and it cannot prove nothing is there.
What your iPhone already does
If an AirTag, or another accessory that works with the Find My network, is away from its owner and travels with you for a while, your iPhone can show a tracking alert and let you play a sound on it. That works without any extra app, as long as Bluetooth, Location Services and tracking notifications are on in Settings. Check that first.
Trackers on other networks are a different story. Some may not trigger an alert on iPhone, and a few cheap copies barely advertise anything recognisable. That is where a scanner can help you look, within limits.
What a Bluetooth scanner can and cannot show
- It can list every Bluetooth Low Energy device advertising near you, with signal strength in dBm.
- It can show how strong a device looks as you move, which is the only clue to where it is.
- It cannot read a label saying tracker. Many devices advertise with no name, and phones, earbuds and watches look much alike.
- It cannot see devices that are switched off, flat, or that only advertise when away from their owner.
- It cannot prove a room is clean. Finding nothing is not a guarantee.
How to look around with Periphery
- Open Periphery and tap Scan. Stay in one spot for a minute so the list fills.
- Set Sort by to Strongest signal. Whatever is at the top is physically closest to you.
- Tap Trackers above the list to show only devices that broadcast a public tracker identifier. Each one is marked Possible tracker.
- Open the filter menu and switch Hide unnamed devices on and off. Many trackers advertise no name, so the unnamed rows are the ones to look at more closely.
- Move to another room and scan again. A device that keeps showing near the top wherever you are deserves a closer look.
- Swipe its row and tap Locate, then follow the gauge from cold to hot. Check pockets, bag seams, under seats and inside wheel arches.
Why a hidden tracker is hard to pin down
Trackers change their Bluetooth address regularly to protect privacy, and iOS shows each new address as a new device, so the same tracker can come back as a new row. Signal strength also jumps with walls, bodies and bags, which is why the distance in Locate is only a rough guide. Trust warmer or colder, not the number.
The Trackers filter
Tap Trackers above the list to see only devices that broadcast a public item-tracker identifier. Each is marked Possible tracker, with the brand when it can be told, Seen for how long it has been nearby, a rough distance and Signal getting stronger when it is. A tracker that stays close for several minutes while you move may be travelling with you. It cannot see every tracker, and it is not a guarantee.
Questions and answers
Can Periphery tell me a device is a tracker?
Will my iPhone warn me about an AirTag?
Does a strong unnamed device mean someone is tracking me?
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