This Cell Phone Detector contains a very sensitive long distances circuit that can detect the mobile phone signals from 30 to 40 feet away. It is a very useful and can be used to detect cell phones at the places where they are not allowed, for example examination halls, meeting rooms, petrol stations, religious places and etc. The circuit can also be used to detect any spy cell phone or also for finding the lost cell phone when the phone is on vibrate alert. The circuit cannot detect the speech or text message contents, it can only detect the encoded signal sound due to which we can