Cell Phone Anonymous Call Blocking
If you want to make sure that Cell Phone Anonymous Call Blocking can effectively block the cell phone signal is very important, when buying a cell phone signal jammer, testing is a very important step. The first thing to do is to test the shielding distance of the mobile phone signal jammer. Cheating candidates use different mobile phone networks during the exam, especially the 4G mobile phone network (4G network uses a broadband high-speed transmission method, if the cell phone jammer power is not enough, it may not be able to block 4G).
Therefore, it is necessary to find all the mobile phones of the current mobile communication providers before testing, to ensure that each mobile phone network can meet the minimum one classroom, and then to test the shielding effect after turning on the machine. Make sure that there is no signal on the mobile phone within half an hour. Occasionally appears. Another important point: if it is a mobile phone signal jammer with a metal casing, touch the front and rear sides of the fuselage with your hands after 1 hour of turning on the phone. If the temperature is moderate and not hot, there is no problem. If it is very hot, it will not pass. It will cause Cell Phone Anonymous Call Blocking power attenuation, cannot work stably, and is prone to burns.