Signal jammers cannot be used privately in some areas
The Global Positioning System uses radio signals in frequencies (spectrum) that are reserved for radio navigation services. To ensure the continuity of GPS services, the spectrum must be protected from interference. The GPS interference can come from a variety of sources, including frequency bands in the vicinity of the wireless transmission or intentional interference from weather outside of natural space.
The US government is committed to minimizing the sources of artificial GPS interference through frequency regulation (domestic and international), interference detection and reduction, and law enforcement.
The cell phone jammer can prevent you and others from making 9-1-1 and other emergency calls, which poses a serious risk to public safety communications and disrupts the daily communications of others. Jammers The use of telephones, GPS interceptors, or other signal jamming devices designed to intercept, interfere, or intentionally interfere with authorized radio traffic is against federal law. Tax deductions cannot be used on businesses, classrooms, homes, or vehicles. Local law enforcement agencies have no independent authority to operate jammers; with a few exceptions, they can be used by federal law enforcement agencies in accordance with applicable regulations.
A WiFi Jammer sends electromagnetic waves of a certain frequency. Then the wave is broadcast throughout the area. Radios receive this wave (when tuned to that frequency) and block another wave broadcast by the broadcaster. This will happen if you don't first check that it is in use or that the radio cannot hear on that frequency. This can also happen if the device accidentally broadcasts a signal (for example, a cable TV accidentally broadcasts on an airplane's emergency frequency). There are many reasons for service interruptions or disruptions. If you have a problem with your service, first contact your wireless service provider to investigate the problem.
This concept can be used in wireless data networks to interrupt the flow of information. Some countries use radio interference to prevent foreign radio stations in border areas from reaching the country.