How to Choose a Mobile signal jammer?

Hello Keyne! First, I must agree with you. Indeed, students are more and more inclined to look at their cell phones rather than their teachers. The phone was used for some bad things. For example: send text messages in class, test cheating. Of course, using a mobile phone jammer is a very effective method. But this may involve interfering with students' freedom of communication. I suggest communicating with the students first. Jammer as the ultimate measure I hope my answer can help you