Your phone is a beneficial device for recognizing various types of surveillance gadget if you believe you're being watched by a hidden camera somewhere in your property or some other personal area.
Although not a failsafe, it is feasible to find hidden cameras, microphones, and other listening devices using the camera and magnetometer sensor on your phone.
Some covert cameras produce IR light, that is invisible to the unaided eye. If you preserve your phone near enough, the camera on it will be able to capture infrared light.
Your camera's display will show a strong blue-white glow if you discover a hidden camera that emits infrared light.
STEPS TO USE YOUR PHONE TO FIND AN IR-EQUIPPED CAMERA:
Open the camera app to your smartphone.
Walk around the room and aim the camera on your phone towards potential hiding spots for surveillance gear.
Drop your phone and go searching extra in case you see any tiny, bright white lights. It is probably a covert camera.