Jammers can be beneficial if used properly to block unwanted signal under certain circumstances.A mobile phone jammer is used by nightclub and casino owners to stop cell phone use in the building. The jammer also stops Internet use through Wi-Fi network and even blocks Bluetooth connections. The cell phone signal jammer also puts an end to text messaging, so students cannot SMS each other, while the teacher is trying to teach.jammerfromchina.com

Driving on I75, some people drive as they are drunk but I guess they are not since they are doing 45 mph and talking on a cell phone. I wish I had a jammer...just once!