What is a Cell Phone Jammer?

A cell phone jammer is an electronic device that interferes with the normal connection between a cell phone and a communication base station by emitting electromagnetic waves in the same frequency band as the cell phone signal, thereby preventing the cell phone from receiving or sending signals. The main function of this device is to shield the cell phone signal, making it impossible for the cell phone to make or receive calls or use the data network.


A cell phone jammer emits high-power wireless signals in a specific frequency band that cover the cell phone signal frequencies (such as 2G, 3G, 4G, 5G, Wi-Fi, etc.) in the target area. Since the cell phone cannot distinguish between the jammer signal and the base station signal, it will not be able to establish a stable communication connection due to interference.


Successfully jamming cell phone signals is essentially the same as jamming any other type of mobile radio communication using a standard signal blocker. Remember that wireless devices communicate directly with their designated service network through base stations, or cell towers. These cell towers divide cities into cells, or smaller areas.

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How do cell phone signal jammer work?

Cell Phone Signal jammer generate and transmit wireless signals with the same frequency band as the target, but with higher intensity. This interference signal covers the wireless signal spectrum in the target area, making it impossible for mobile phones to identify the effective signal of the base station.

Characteristics of interference signals:

Bandwidth matching: The interference signal covers the target communication frequency band.

Noise signal: The jammer usually transmits a continuous random noise signal or a pseudo signal similar to a base station.

Power strength: The power of the interference signal is higher than the base station signal within a certain range, suppressing the normal signal.

The communication between mobile phones and base stations uses a specific frequency band, and different communication technologies (such as 2G, 3G, 4G, 5G) use different frequency bands. Common frequency bands include:

2G (GSM): 900MHz and 1800MHz

3G (WCDMA/CDMA2000): 2100MHz, etc.

4G (LTE): 800MHz, 1800MHz, 2600MHz, etc.

5G: 3.5GHz, 28GHz, etc.

Mobile signal jammers will set the frequency range of the jamming signal according to the frequency band used by the target mobile network.

Why do we need to use signal jammer?

Signal jammers are mainly used to protect privacy, prevent information leakage, prevent cheating, maintain order, ensure safety or avoid device interference. However, their use must be in accordance with laws and regulations and used on the premise of ensuring that public communications are not affected to balance the relationship between specific needs and public interests.

Privacy protection: In some cases, signal jammers can prevent unauthorized devices from accessing the network, thereby protecting users' privacy and data security.

Information leakage: Signal jammers can prevent the reception of signals from eavesdropping devices and protect sensitive information from being illegally stolen.

Information security: In specific environments, such as military or government agencies, the use of signal jammers can prevent hostile forces from obtaining key information.

Restrict device use: In some occasions (such as exams and meetings), signal jammers can prevent the use of communication devices such as mobile phones to keep the environment quiet and focused.

Protect the network: By interfering with unsafe signals, the risk of network attacks and intrusions can be reduced.

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Signal Jammer FAQ

how far can a signal blocker jamming?

The range that can be shielded depends on the power of the signal scrambler and the surrounding environment and signal strength. For example, the presence of walls and wood will affect the transmission distance of the signal jammer. Low-power radio jammer can shield a radius of about 1-10 meters. Circle range, if conditions are ideal, high-power jamming device can even block areas with a radius of more than 100 meters.

With the development of science and technology, the current signal jammer is very convenient to use. It only needs you to turn on the switch and open the signal frequency band you want to shield. After 2-5s, the signal shielding can be completed. It can only block the mobile phone signal and Do not block WiFi signals , only interfere with the frequency you want to interfere without affecting the use of other smart technology devices.

Now the signal frequency bands of smart devices are as high as dozens or even hundreds, and the signal frequency bands of each device are different. If you want to block the communication signals of all frequency bands, only military jammers can achieve this effect, but if we use them in our daily life There is absolutely no need to block signals in all frequency bands, just block the most important signal frequency bands.

Of course, we can also customize the signal frequency band you want to block without extra charge.

A signal jammer is a device used to interfere with radio frequencies. It can emit high-frequency signals that interfere with the normal operation of other radio equipment.In order to apply to different usage scenarios, Signal blocker derives a variety of different types:, including fixed, adjustable, and programmable. The signal frequency output by fixed jammers is fixed, while adjustable and programmable jammers can adapt to different jamming needs by adjusting the frequency or amplitude.What is the blocking principle of signal scrambler?The principle of the jamming device is to interfere with the normal operation of other equipment by sending out high-frequency signals. These signals are usually emitted in a specific frequency band, usually the radio frequency band. They can be emitted at a fixed frequency, a changing frequency, or a random frequency.Application scenarios of jammer signal blockerSignal Disruptor have a wide range of applications, it can be used for a variety of purposes, including protecting classified information, preventing radios from being snooped or tracked, or jamming the signals of other radios. They can be used in government, military, business or personal fields.but they can also cause interference with the normal use of radio equipment. Therefore when using a signal jammer, you need to pay attention to the surrounding environment to avoid interfering with irrelevant equipment or causing unnecessary interference.Signal jammer is a useful radio device that can be used for a variety of purposes. However, due to their special nature, care needs to be taken when using them to ensure that they do not cause unnecessary interference to radio communications.

Jamming with a mobile phone is like interfering with any other type of radio communication. A mobile phone communicates with its service network through a base station. As cell phone users drive down the street, the cell signal switches from one base station to another.

We know that radio communication uses electromagnetic waves to communicate. The functional properties of electromagnetic waves are determined by their frequency. Our mobile phones must emit qualified electromagnetic waves in order to connect to our telecommunications carrier base stations. Different communication systems use different frequencies, so that everyone is safe and does not interfere with each other.

The phone signal jammer emit the same radio frequency signal as the cell phone signal. Since the frequencies are the same, the cell phone cannot tell which signal is a regular base station signal, thus "jamming". As long as there is a machine on the same frequency as the phone, the base station will make a lot of "noise" when it tries to connect to the phone. You will find that the signal from the phone is unrecognizable, so you will refuse to communicate with the phone.

In the early days, jammers only blocked one set of frequencies, such as 2G, while sophisticated jammer device can block several types of networks at the same time, such as 2-3-4G.

Actually simple. That is, the jamming disruptor bands corresponding to these three signals are repeated in a cyclic manner, covering these three jamming bands at the same time, and the interval of this cycle is so small that the mobile phone has no chance to speak and can only sit down. Covering 2/3/4G, what about bluetooth and wifi? It doesn't matter, the same can be done. The frequency jammer has evolved again, adding the frequency bands of bluetooth and wifi to the scanning range, so that several common communication methods in the society are completely covered.

Many people do not understand the difference between Bluetooth, Wi-Fi and mobile data. They seem to be wireless communication technologies. In fact, the main difference between them is the frequency band. In mobile communication technology, 2G mainly works in the 900-1700MHz band, 3G works in the 1900-2100MHz band, and 4G works in the 2300-2500MHz band. Bluetooth and WiFi work at 2.4GHz.