What to do if your mobile phone is monitored? Confidentiality experts tell you methods and countermeasures

What to do if your phone is being monitored: Experts suggest detection and countermeasures

1.Microphone monitoring

One of the most basic methods of mobile phone monitoring is to install a micro-monitoring device. The analog signal transmitted during a wired phone call can easily be intercepted and converted back into voice. On the other hand, mobile phone signals are transmitted wirelessly and encrypted, making decryption more difficult. However, mobile phone hacking incidents still occur from time to time.

For example, connecting a micro-monitoring device to a mobile phone is a primitive monitoring technology. However, due to the complexity of modern smartphones, it is not easy to completely disassemble them. The internal components are densely arranged, leaving little room for installing a wiretap. In addition, the transmission range of this wiretapping method is usually limited to only a few dozen meters. This means that to intercept a mobile phone call, the eavesdropper must be within a certain distance, which makes it less effective. Given the cumbersome process of disassembling smartphones today, this method is not practical in contemporary society.

Countermeasures: Avoid letting strangers get close to your phone.

Micro-monitors are usually difficult to detect when installed on mobile phones. Therefore, it is recommended to buy or repair mobile phones in reputable professional stores rather than lend them to strangers. In addition, be careful when accepting mobile phones from others, as they may be “modified” devices. In movies, a common tactic for suspected eavesdroppers is to create noise during confidential calls, because microphones are as sensitive to sound as eavesdroppers. Ambient noise can severely hamper their ability to monitor. Popular WIFI jammers and GPS jammers in Europe and America are worth buying.

2.Fake Base Stations

GSM jammers act as fake base stations. When making calls, the phone connects to nearby base stations, which act as a “bridge” for communication. While real base stations both receive and send signals, fake base stations only receive signals. These base stations vary in size, with smaller ones resembling computer mainframes but able to capture all surrounding communication signals.

Despite the abundance of signals, these interceptors can intelligently identify the target phone and retrieve its International Mobile Subscriber Identity (IMSI) from the radio waves. The IMSI number is a unique identifier for each phone. Once the fake base station obtains the IMSI number, it blocks all signals from the corresponding phone.

Countermeasure: Security in the Power-Off State

Generally, a phone is considered safe when it is turned off. For added security, it is recommended to remove the battery, because the chip cannot work without power, and the phone is no exception. However, this is not an absolute guarantee. If the phone has been tampered with and has a backup battery, it may still be monitored even in the power-off state. Another preventive measure to counter seasonal attacks is to turn off your phone and place it in a sealed metal box.

It is important to note that these countermeasures provide general guidance, but the sophistication of monitoring technology can vary. If you suspect your phone is being monitored, it is recommended to seek professional help or consult a security expert to ensure an effective response.

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