While GPS jammers can cause minor disturbances, such as signal loss, they can also pose a large risk to public safety. For instance, jammer gps cannot distinguish between types of communications and may block ingoing or outgoing calls from emergency responders. Additionally, the devices could block more than calls and disrupt all communications within a broad frequency range.

　　The Russian military is buying up jamming devices which it plans to mount on cell phone towers. The idea behind it is simple — the Kremlin could switch on the signal jammer, known as Pole-21 to confuse American GPS guidance.

　　Russia has about 250,000 cellular base stations.

　　As more industries -- like law enforcement and transportation -- rely on GPS-enabled devices, jamming has the potential to interfere with business-critical operations and data. In fleet management tracking, GPS information can be connected to data such as fuel use, driving behavior, engine health, vehicle synchronization and safety metrics.
Therefore, signal jammer can disrupt all of this information and cause major outages.noted that the devices appear to be part of a larger push by Russia to prepare itself for the possibility of major conflict.