How to use cell phone jammers?

Teacher by profession I live in Kansas, I teach history at a very premier college in Kansas but there are certain students that tend to create disturbance by using there cellphones for unneccessary conversations during the classes. Thus I am looking forward to suggest college authorities for using something among the cell phone jammers which could help me take my classes without any disturbances. Do anyone have information on how to use cellphone jammers without compromising on the safety point of view. It would really be nice if you could suggest me a good cell phone jammer.

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