IMSI Catcher and Selective jammer is an eavesdropping device used to intercept mobile phone’s traffic and tracking location data and mobile phone user. IMSI Catcher and Selective jammer masquerades as a mobile phone tower deviating phones within a certain radius into connecting to the device. Mentari Setia Sdn Bhd are the supplier of the IMSI Catcher device in Malaysia.

IMSI Catcher and Selective jammer use in Law enforcement

Law enforcement agencies in many multiple countries used the device to track cell phones in order to gather information or/and eavesdropping in on conversations. Some military intelligence branch used the device to intercept terrorist’s phone calls and found out the exact locations of their target.

What Does a Cell Phone Jammer Do?

The main purpose of a cell phone jammer is to stop all cell phones in the location from being able to communicate with the cell phone tower. Although the concept is simple, the methods used to achieve this are quite complicated.

Cell phone jammers work by targeting frequencies that cell phones typically use to communicate. Cell phones use different frequencies because they send and receive signals simultaneously at all times. Cell phones can also switch between frequencies to try to find the best channel for communication. 

Less sophisticated cell phone jammers attempt to block cell phone signals by jamming only one frequency. Often, jamming one frequency that the cell phone uses can trick the device into believing that there is no signal. In turn, the device will not function.

More sophisticated cell phone jammers can block more than one frequency at one time. These jammers can be set to target several different frequencies that the cell phones are using, to stop both sending and receiving data. This method can also help jam signals that cell phones will attempt to switch to for a better connection as well.

More sophisticated devices, therefore, can jam cell phones on multiple networks and cut off all communication of data.

Cell Phone Jammer Uses

When it comes to the government and military, signal jammers are powerful counter tool for counter-terrorism strategies for everything from blocking radio communication to disabling explosives. Stopping criminals and offensive forces from communicating is key to thwarting their plans and ability to gather and strategize.

When it comes to civilians, signal jammers are also very useful.

Civilians that are worried about their privacy see signal jammers as a defensive tactic. Signal jammers can stop cell phones and other devices from communicating with the outside world. This can stop devices like microphones, GPS trackers, and cameras from transmitting data to malicious actors.

If a civilian is bombarded by scammer calls or needs quiet time, a cell phone jammer can stop a cell phone from receiving calls. It can help bring peace and allow you to focus on your life rather than constant phone calls.

Employers can use cell phone jammers on small and large scales. They can use them during meetings to stop employees from being distracted. Or, they can stop employees from sending and receiving communication with their cell phones during work hours.

At schools, cell phones are a major distraction. Often students will use them to cheat on tests or carry on private conversations that distract from learning. Cell phone jammers can be used by schools to stop students from using their cell phones during school hours.

Other places that rely on the quiet, such as libraries and theatres, might use cell phone jammers to stop visitors’ phones from ringing. It can also discourage people from using their phones altogether during their visit.

How it works

The IMSI Catcher tricked the targeted cell phone into believing they are the closest cell towers. Once the cell phone connects to the IMSI Catchers, the unit will act as a middle device between the cell phone and the real tower.

Mobile phones work by searching for the closest cell’s towers. The IMSI Catcher will tracked the targeted mobile phone and tricked it into identifying it as the closest cell towers. After successfully connecting to the cell phone, the IMSI Catcher device will become the middle devices between the cell phone and the tower.

Are smartphones immune to the IMSI Catcher device?

There is a belief among iPhone users that their phones are encrypted and thus they are safe from IMSI catchers. This is simply not true. Both Android and iOS devices can be tracked with ease using IMSI catchers.