A signal jammer is a device that emits radio frequency signals to disrupt or block communication between devices within a specific range. By broadcasting on the same frequencies as targeted signals—such as 2G, 3G, 4G, 5G, Wi-Fi, or GPS—a jammer creates interference, preventing devices from sending or receiving data. For example, a cell phone jammer can render phones unable to make calls or access the internet within its coverage area. The effectiveness depends on the jammer’s power, antenna design, and frequency compatibility.
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