What is a "Jamming Cell Phone"? The Most Authoritative Explanation.
What is a mobile phone jammer?
Mobile phone jammer. A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals...Why is my phone jammed?
The frequency of the RF signal is similar to the signal employed by cellular phone carriers and renders the phone unstable. The jamming occurs with the downlink signal. When your phone is being jammed, you will not see any signal bars on your phone.Can cell phones and other signal jamming devices prevent you from calling 911?
But as troubling as these scenarios may be, cell phone and other signal jamming devices are NOT the answer. Signal jamming devices (e.g., cell phone, GPS, and radar jammers) can prevent you and others from completing 9-1-1 and other emergency calls.How far can a cell phone jammer block cell phone signals?
E.g. a cell phone jammer with 1W of output power per channel can block cell phone signals within 10-30 meters, ONLY IF the cell phone signal strength in that location is either decent or weak (1-2 signal bars on your phone).
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