Mobile Phone Detector! Cell Phone Detector The new generation Mobile Phone Detector detects the presence of regular and/or concealed GSM mobile phone units which is now becoming a great security concern since they can often be used as an illegal bugging devise. Mobile phones are being used to illegally record and send both audio and video to third party locations.This new generation law enforcement grade unit instantly detects this illegal eavesdropping! This high grade pocket sized unit will silently vibrate when it detects a mobile phone that is in use! Since it does not jam the signal nor tape into the signal, these units are legal to use in this form.