The cell phone signal disappeared during the exam

  • CashLouise
    Recently, there is examination week in our school, it is very common thing, but one thing is different from previous years, during the examination period, if you are too close to the classroom, your mobile phone will lose signal, what is happening?
  • PerfectjammerPerfectjammer
    According to you, maybe your school has cell phone jammer in the classroom.This is a very common practice, and many countries use the devices during exam time. In the space within the device, all cell phone signals are cut off

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