Using the phone in your pocket to look for hidden cameras

What each part of your phone can do

• Flashlight and rear camera. The light sits a few millimeters from the camera, so a lens in the room reflects the light back into your phone's view as a small bright dot. This is the most useful single check and works on any phone.
• Front camera. Many phones filter infrared light on the rear camera, while the front camera often lets more of it through. That can make the invisible infrared LEDs of a night-vision camera show up as a purple or white glow. Results differ from phone to phone.
• Wi-Fi. When you join a network, your phone can see other devices on it. A camera that streams over that network is one of those devices.
• Bluetooth. Your phone can list nearby devices that advertise over Bluetooth. Some cameras do, often for setup; many do not.
• Magnetometer. The sensor behind the compass changes its reading near metal and electronics. Held against an object, it can hint that something electronic is inside. It cannot tell a camera from any other circuit.

Test your front camera first

Before you rely on any phone for an infrared check, find out whether its cameras see infrared at all. Point a TV remote at the front camera, press and hold a button, and watch the screen. If you see the remote's tip flicker or glow, that camera can see infrared. Try the rear camera the same way. Use whichever shows the brighter glow. If neither does, skip infrared checks on that phone. The infrared guide explains what the glow of a night-vision camera looks like.

On Android: structured scans with Candor

Candor puts the phone's hardware into four checks. The lens finder turns on the flashlight and marks small, sharp reflections in the view, with a front-camera infrared mode. The Wi-Fi camera scan queries the network you have joined for devices that answer camera discovery requests or keep video stream ports open, and says why each one was flagged. The Bluetooth scan flags camera-style names, tracker formats and close unnamed devices, with rough distance from signal strength. The magnetic sensor measures changes from a calibrated room baseline as you move along objects.

Every scan runs without a subscription, and scans run on the phone without recording or uploading camera video. The detector app guide walks through a full sweep.

On an iPhone: manual checks without an app

There is no iPhone version of Candor. You can still cover much of the same ground by hand.

• Flashlight glint. Turn the flashlight on, open the camera app, darken the room and pan slowly across anything facing the bed or bathroom. Look for a tiny, steady point of light that does not smear as you move. Zoom in on the screen to inspect it.
• Front camera infrared check. After the remote test above, switch to the front camera in a dark room and turn slowly. A small cluster of glowing dots on a wall object is worth a close look.
• The router's device list. If you have access to the router's admin page or its companion app, as you might in your own home, look at the list of connected devices. Unknown names, or names containing words like cam or IPC, deserve questions. In a rental you usually will not have this access, and you should not try to get it without permission.
• Bluetooth names in Settings. Open Bluetooth settings and look at the other devices listed nearby. This shows only some devices, but an unfamiliar camera-like name in a room with no visible camera is a clue.
• Physical inspection. Lift, turn and look behind objects that face private areas, and question any unexplained power adapter or cable.

Reading what you find

Treat each phone result as a reason to look closer, not as proof. Glass, screws and status LEDs glint. Smart TVs and speakers appear on networks and in Bluetooth lists. A magnetometer spike near a lamp means the lamp has wiring. The clue that matters is a match between two checks, such as a lens glint on an object that also shows up as an unexplained network device.

If you find a likely camera aimed at a private area, cover it or unplug it if that is safe, photograph it in place, and report it to the host, hotel or platform. Contact police if you think you were recorded where you had a right to privacy.

Frequently asked questions