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How to control students' use of mobile phones, how to establish a balance between learning and entertainment... This seems to be a problem faced by parents and schools all the time. Philadelphia Bus Ride Cell Phone Blocker Installed in the campus, and turn it on regularly every night to prevent students from playing mobile phones at night. However, some residents living in Shijiayuan, Fuyang City, said that when using mobile phones at home, the signal was unstable, and they suspected that it was related to the school's mobile phone signal jammer. According to the Radio Authority, a cell phone jammer is a type of radio station that cannot be installed in schools without approval. I have to admit that the original intention of the school to install signal jammers and shield students' mobile phones at night is to overcome the "mobile phone dependence" of some students and make mobile phones truly return to the standard of communication and learning tools. However, the author believes that the method of forcing students to "separate human and machine" is inappropriate. This is a quick and easy way of education. It may work in the short term, but it will be difficult to achieve long-term expectations.