How to Check for 'Hidden Cameras' Using Your Phone's Camera

How This Trick Actually Works

Many cheap covert spy cameras use infrared (IR) LEDs for night vision, the same way a security camera or an old TV remote does. Infrared light sits just outside the range human eyes can see, but most phone camera sensors — despite having an IR filter for normal photography — are still sensitive enough to pick up strong IR sources, especially in a dark room. Point your phone's camera around a darkened space, and an active IR illuminator shows up on screen as a small bright white or purple-white dot, even though your eyes see nothing there.

Step 1: Darken the Room

Turn off all the lights and close blinds or curtains to block outside light. The darker the room, the more clearly an active IR LED stands out against the background on your phone screen. This is the single biggest factor in whether the method works at all — trying it in a lit room simply won't reveal anything.

Step 2: Open Your Camera App

1. Open your phone's native Camera app (third-party apps sometimes apply aggressive IR filtering; the stock camera app tends to work best).
2. If your phone has a night mode or low-light mode, you can leave it off — you actually want the raw, unprocessed sensor feed rather than a computationally brightened image, since aggressive noise reduction can wash out small IR points.
3. Do not use the front-facing selfie camera if you can help it; most front cameras have a stronger IR-cut filter than the rear camera and are less sensitive to this trick.

Step 3: Sweep the Room Slowly

1. Hold the phone up and slowly pan it across likely hiding spots: smoke detectors, alarm clocks, USB chargers, picture frames, stuffed animals, air purifiers, and anything pointed at a bed or shower area.
2. Watch the phone screen, not the room directly — the point is to see through the camera sensor, since your naked eye cannot perceive IR light at all.
3. Look for a small, steady bright white, pink, or purple dot that doesn't correspond to any visible light source in the room. LED indicator lights on legitimate electronics (routers, smoke detectors, chargers) are usually visible to the naked eye too and will look the same through the camera — the giveaway is a bright point that's invisible without the camera but clearly lit through it.

Step 4: Use a Flashlight App as a Secondary Check

For objects you're suspicious of but can get close to, shine your phone's own flashlight directly at the suspected object from a few inches away and look for a small glass or plastic lens reflecting the light back as a distinct glint — this is the same principle photographers use to spot a hidden lens by its reflective coating, similar to how a cat's eyes reflect a flash in photos.

Step 5: Use a Dedicated Detector App for a Second Opinion

Several apps on iOS and Android (search "hidden camera detector" on the App Store or Play Store) combine the IR-sweep method with a magnetic field detector that uses your phone's built-in magnetometer to flag nearby electronics, and some add a Wi-Fi network scanner that lists devices connected to the local network — a camera broadcasting to an unfamiliar SSID-connected device on the network is a strong red flag in a hotel room or rental. These apps aren't infallible, but they add a second detection method beyond the IR sweep alone.

Step 6: Check the Local Wi-Fi Network

Many cheap Wi-Fi spy cameras connect to the same network as the room's router. If you have admin access to the router (unlikely in a hotel, more plausible in an Airbnb where the host shares credentials), you can check connected devices:

1. Log into the router's admin page (commonly 192.168.1.1 or 192.168.0.1, printed on a sticker on the router itself).
2. Look for a Connected Devices or DHCP Client List page.
3. Scan the list for unfamiliar device names, especially ones with generic manufacturer prefixes commonly used by cheap IP camera modules.

Alternatively, a network scanner app like Fing (available free on iOS and Android) can enumerate devices on the Wi-Fi network you're currently connected to without needing router admin access, listing IP addresses, hostnames, and manufacturer identification for each.

What to Do If You Find Something

• Do not touch or attempt to disable the device yourself if you're in a rental property or hotel and plan to report it — leave it in place as evidence.
• Photograph the device and its location.
• Leave the room or property if you feel unsafe, and contact local law enforcement — in many jurisdictions, covertly recording someone in a space where they have a reasonable expectation of privacy (bedroom, bathroom) is a criminal offense.
• Report the listing to the booking platform (Airbnb, Vrbo, Booking.com) if applicable; most platforms have zero-tolerance policies and dedicated trust-and-safety teams for this exact scenario.