How to detect a "HIDDEN CAMERA"

How to detect a HIDDEN CAMERA in changing rooms in garment shops & boutiques........  

 

In front of the changing room, take your mobile phone and make sure that your mobile can make calls. 

Then enter into the changing room, and make a call.
If u can't make a call, there is a hidden camera.
This is due to the interference of fiber optic during the signal transfer  



Credit to:Cik Ana^^