In front of the trial room take your mobile and make sure that mobile can make calls........
Then enter into the trail room, take your mobile 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 cable during the signal transfer......
Then enter into the trail room, take your mobile 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 cable during the signal transfer......