A signal jammer overrides the signal transmitted by a cell phone on the same frequency at the location. When the two signals hit each other, the signal transmission is disturbed and leads to a cut out. Cell phones are planned to add influence if they practice low signal levels, so the jammer must distinguish and the power should be increase from the phone signal power.
Cell phones are full-duplex devices; they use two different frequencies simultaneously, one for talking and another for listening. Particular jammers prevent only one of the frequencies used by cell phones, which results in disturbing both frequencies. The phone is cheated intelligently, as there is no service because it can receive only one of the frequencies, so they can’t be communicated.
Fewer multifaceted devices chunk only one set of frequencies, while urban jammers are used to block several types of frequencies at a time; they can block two or three different frequencies at a time. That automatically changes among dissimilar network types to find an open signal. The high-end jammer devices block all frequencies at once, and other devices can be adjusted to block the specific frequencies of the cell phone.
The signal jammer is a device that you program with the exact frequencies to block the signal. Although dissimilar cellular devices process different signals, all cell phone systems use radio signals that can be disturbed. GSM used in digital cellular and PCS-based systems, works in the frequency range of 900 MHz and 1800 MHz in Europe and Asia and about 1900 MHz in the United States.
The range of the jammer depends on its efficiency and the atmosphere. Low-powered jammers block signal transmission within a range of about 30 feet. Higher-powered units create an area as large as a football field. Law enforcement uses a device that can shut down service up to 1 mile.