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The phone will display "poor reception" when it is in range of the jammer


If you have ever wanted to know the function of a phone blocker, then you have come to the right place. This article will discuss the most common types of jammers and their working principles. The key to interfering with mobile phone signals is frequency. Different countries/regions use different frequency bands for their mobile networks. The United States and Canada use the 1900 MHz frequency band as their main frequency band, while Europe and Asia use the GSM 900 and 1800 frequency bands. In some countries/regions, local operators have licensed to use the 450 MHz frequency band to cover CDMA.

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However, the use of signal jammer is legal in certain countries/regions, while it is not legal in other countries. The mobile phone industry strongly opposes the use of jammers and invests funds in educating people on correct mobile etiquette.

Basically, the working principle of a mobile signal blocker is to block signals from the phone. It achieves this by transmitting signals at the same frequency as nearby mobile phones. This type of signal generates strong interference, so when a person is within the range of a mobile phone jammer, they will lose the signal and their phone will display a "poor reception" message. However, they can still make phone calls.

A signal blocker is an electronic device that can block signals emitted by mobile phone and internet usage. This is a good tool for students to protect themselves by preventing cheating during exams. The working principle of this device is to block signals at a distance of at least 500 meters from the transmission station, so while preventing cheating, it can still use mobile phones and the internet normally after the exam. Here are some tips for choosing a jammer store.

Firstly, you need to understand the frequency bands used for communication in the United States. These frequency bands are GSM850, GSM1900, 3G (850/1900 and 1700/2100), and 4G (Verizon USA 4G, Sprint Clearwire WiMAX, T-Mobile 4G). People usually use these frequency bands to use their phones. However, if you plan to use signal shields in public places, you must comply with some exceptions.

Students use their phones to cheat during exams and engage in private conversations. To avoid such interference, schools use signal blockers to prevent the use of mobile phones during class hours. Other areas that require silence include prisons. Prison cell phone jammer can only be used inside prisons and will not interfere with commercial signals. It is worth noting that each type of signal jammer has a specific application range.