What is the effect of this kind of mobile phone signal jammer? The reporter had a bargain to buy a portable cell phone jammer with the smallest coverage for 120 yuan. The Gps And Cell Phone Jammer is similar in size to a general candy bar phone on the market, but the thickness is about twice that of a phone. The full metal shell, with 3 antennas on the top, can respectively interfere with the signals of China Mobile, China Unicom, PHS, and even the recent 3G mobile phones. The instrument claims to be able to shield various cell phone signals within a radius of two meters. The reporter then found 4 mobile phones of different brands and different operators for experiments. When the reporter presses the switch of the mobile phone signal jammer, the top of it lights up with a green light. After about 30 seconds, the screens of these 4 mobile phones all show no signal, and the call cannot be made, even "110", "120", and " 119" These emergency numbers are not working. If you use a fixed phone to call a mobile phone in the shielded area, it shows that it is temporarily unavailable. cell phone jammer
When the reporter took out the mobile phone two meters away, after a few seconds, the signal of the mobile phone was restored, and the calls were normal. Subsequently, the reporter also took the Gps And Cell Phone Jammer device to a car equipped with GPS anti-theft equipment for experiments, and the test results made the car owner frightened. Since the GPS anti-theft devices currently on the market actually communicate with the monitoring center through mobile communication signals, when the device is opened and placed in the car, the GPS is "blind." At that time, the reporter parked the car on the side of the road, turned on the device, and placed it in the car. When he got out of the car and dialed the phone of the GPS company's main station to request the positioning of the vehicle, the other party still said that it could not locate the vehicle after three minutes of hard work. The reporter also experimented with this device on taxis equipped with GPS navigation and anti-theft devices from different companies. The results showed that the car navigator lost the signal, and the car phone and the monitoring center couldn't communicate at all.