Cell phone signal jammers are also called cell phone signal blocker. Listening to this name, you know that it is a tool used to block mobile cell phone signals. However, most people don't know what kind of signal can block the mobile phone. So today I will share the knowledge points with you.

    First of all, the 2g/3g/4g/5g/WIFI/GPS/Bluetooth signal corresponding to the mobile phone can be blocked by the mobile phone signal jammer. After the mobile phone signal blocker is turned on, the mobile phone cannot receive 2g/3g/4g/5g/ WIFI/GPS/Bluetooth signal. Of course, this is not a fixed combination, you can choose the frequency band you want to shield for precise shielding. Therefore, many cell phone signal jammers will be derived according to their uses, such as WIFI jammers, cell phone signal jammers, GPS jammers, and Bluetooth jammers. Among them, we mentioned a term called frequency band.

    Common mobile phone 2G/3G/4G signals actually have specific frequency band values, such as 700Mhz/800Mhz/850Mhz/900Mhz/1700Mhz/1800Mhz/1900Mhz/2100Mhz/2300Mhz/2600Mhz. These are all 2G/3G/4G frequency bands for mobile phones, but different operators in different countries use different frequency bands. For example, the same frequency is 2100Mhz. In Europe, it may be 3G, but in Asia, it may be 4G.

    So you only need to know which operator your mobile phone is and what mobile phone signal you want to block, select the specific frequency band, and then you can accurately block it. Some friends here will ask questions, can't I just block all the frequency bands? In theory, this is true, but there is no mobile phone signal jammer that can block so many frequency bands at the same time. Why? Suppose the power of a mobile phone signal jammer is 100W, and there are only 5 frequency bands that I need to shield, so the power of each channel port is 20W. But if I even want signals that don't need to be shielded, there may be 20 frequency bands combined, and the power of each channel port is only 5W. If the power is too low, it is impossible to beat the signal transmitted by the base station. If you want to ensure the shielding effect, you must increase the power of the signal jammer, which will involve the issue of how to dissipate heat. So when choosing a cell phone signal jammer, choose only the frequency band you need.

    A picture is attached to give a general impression to friends who have never seen a cell phone signal jammer. Each antenna on the signal shield represents each frequency band, and the number of antennas represents how many frequency bands are shielded.