Installing a "cell phone jammer" is not random. According to sight reports, the range of "jamming" mask signals is limited to classrooms, and mobile phone signals will be restored only outside the classroom. In order to ensure that it will not adversely affect the health of students, the school attaches importance to product quality and installs " cell phone jammer " as electromagnetic radiation in accordance with relevant standards. Qualified products will not affect few schools. The examination room has been used on the human body. It can be seen that when the school is doing this, the attitude is serious and the students are responsible. The mask signal of the "mobile phone jammer" is limited to the classroom, indicating that the school's actions are moderate and will not affect the students' freedom of communication and freedom of expression. We have the right to exercise the rights of the entire border and cannot infringe on the rights and public interests of others. According to the Constitution, the freedom of citizens and the enjoyment of freedom of speech and rights cannot exceed our own scope. If students play on the phone in the classroom, if it affects the normal educational order, it should have the right to go beyond the restrictions and should be restricted.