GSM is the Global System for Mobile Communications acronym, meaning global mobile communication system, is one of the world is major cellular systems. GSM Jammer is shielded equipment such signals.
Experts said the test group, GPS satellite navigation product problems than expected, especially not accurate navigation serious problem. The GPS jammer emergence of a more deepened the occurrence of such events.
mobile phone jammer used in schools should be legalized because it can contribute to student learning and exam fairness.