When buying a mobile scrambler, in addition to the gsm network you want to choose, you also need to shield the signal type, such as whether you need to shield the GPS WiFi network band. This way you can buy a cell phone jammer that blocks all cell phone signals. If you have purchased a signal jamming device, you need to consider where it will be used. Portable jammers are convenient for indoor and outdoor use, and desktop jammers are generally suitable for large fixed locations. As the name suggests, it will be widely used not only by individuals but also in prisons, courts and other large venues. It has a wide interference range and more types of signal shielding.
I personally recommend using an 8-antenna portable cell phone jammer, which is sufficient for your needs and provides a quiet reading environment when you need to be quiet. For businesses and important organizations, a powerful fixed desktop jammer will be your better choice. This performance is more powerful in terms of functionality and radius of interference and is considered sufficient for large-scale applications.
By the way, electromagnetic waves have a "ionization effect" that can generate positive and negative charges on the material they are struck by. Therefore, the radio can listen to music, the TV antenna can generate electricity, and by zooming in, you can watch news and drama on the LCD screen. Cell phone signal blocker prevents the use of cell phones by interfering with the cell phone radio waves.