Cellphone Signal 3G 2110-2170MHz
Over the past 10 years, 3G signals have been the most common mobile phone signal in the United States. Therefore, the 3G signal cell phone jammer is one of the most popular jammers. Teachers especially like to use 3G jamming devices, can effectively prevent students from sending text messages in class. Of course, today's 3G jamming devices are also equipped with the ability to interfere with 4G, effectively preventing students from cheating during exams.
In addition to education institution, libraries also need this kind of blocker device to keep the library quiet.