Block Cell Phone Notifications
Most of the colleges are adults, and they are responsible for their actions. I think it can exist if you don't listen to the class and play with your mobile phone as long as it doesn't affect the class. Secondly, schools should reflect on why they should install Block Cell Phone Notifications to require students not to play mobile phones, thereby increasing the classroom attendance rate, rather than improving the quality of teaching, and this method is really low. In the university classroom, I am sure and guarantee that every student will sacrifice some unimportant course time by not attending the class in exchange for the hard time for his other goals. In short, the starting point for using mobile phone jammers to increase the rate of classroom attendance is good, but it kills all the options of college students. Such leaders and schools. cell phone jammer
As long as the mobile phone signal jammer is turned on, all mobile phones (China Mobile, China Unicom, and China Telecom) within its shielding range cannot be used normally. You said that 4G can be used at a distance Block Cell Phone Notifications , because the shielding range of the mobile phone jammer is limited, and the mobile phone can be used normally as long as it exceeds its range. The working principle of the mobile phone signal jammer is generally speaking that the frequency emitted by the mobile phone jammer interferes with the normal frequency sent by the mobile phone receiving the base station, making the mobile phone unable to connect to the base station, and thus unable to make calls, receive and send text messages and surf the Internet. If you want a mobile phone to work normally, unless the mobile phone signal is very strong, that is to say, there is a signal amplifier nearby or in a building. For example, if a mobile signal amplifier is installed in the building, it is difficult to shield the mobile phone. If it is China Unicom's signal amplifier, then Unicom mobile phone is difficult to shield. If it's a telecommunications company, the same goes for telecommunications.