A cell phone jammer is a device that sends signals at the same frequency. When the jammer is on, if the cell phone signal area is disabled, the jamming signal succeeds. The first jammer was developed by the military and used for communication purposes. Planned commanders use RF communications to control their power and enemy communications.
Today, mobile users are increasing, so cellphone jammers have become common by comparing them with electronic devices to disable mobile signals in certain locations. The interfering device floods the mobile phone by sending signals at the same frequency as the mobile phone and causing the two signals to collide with each other and cancel each other with sufficient power. Cell phones are designed to increase power with minimal interference.
Therefore, the cell phone jammer must recognize and adjust the performance improvement of the mobile phone. Mobile phones are full-duplex devices, which means they use two separate frequencies, one for talking and one for simultaneous listening. Some jammers block only one of the frequencies used by mobile phones, and both are blocked.