What is the use of mobile jammer?

Hi, Elva.
Indeed, in recent years, the device, known as a cell phone signal jammer, has been mentioned more and more. There were still many people who didn't know what the device was for.
Cell phone jammer is a device that can jam cell phone signals. It is often used in cinemas, cafes and other places. Education has also started using such devices this year. Mainly used to prevent students from cheating in exams. In addition, prisons are introducing such equipment.