How can you not listen?

1. Use an anti-eavesdropping phone. If you buy an encrypted mobile phone, you can encrypt the calls, text messages and files of the mobile phone, such as Huawei's anti-eavesdropping mobile phone.

2. Don't lend them your mobile phone or SIM card. If you lend your mobile phone to them, your mobile phone may be installed with eavesdropping software or your SIM card may be copied, leading to the risk of being monitored.

Large-scale mobile phone monitoring system. Generally used for espionage, the principle is completely different from other bugs. It intercepts the mobile phone signal directly from the air, and can listen to all the conversation contents through decoding. This kind of bug is connected to the computer, which not only makes the monitored person unaware, but also can store hundreds of telephone numbers and record the eavesdropped contents into the computer hard disk. Of course, such professional equipment is expensive, and the asking price is as high as several hundred thousand yuan.

Chip bug Chip bug is a common type in the monitoring market at present. According to the effective distance, it can be divided into three or five meters to hundreds of kilometers and other types and levels, and the price ranges from several hundred yuan to several hundred thousand yuan. The chip is generally divided into two parts, one is installed in the eavesdropper's mobile phone, and the other is installed in the eavesdropper's mobile phone. No matter whether the eavesdropper makes or answers the phone, the eavesdropper's mobile phone will have a corresponding prompt tone. If the eavesdropper is willing to eavesdrop, he can hear the conversation, and the mobile phone with recording function can also record the conversation. This chip is only the size of a SIM card. According to the instructions on the package, just find a repairman at the mobile phone repair point and install it directly in the mobile phone without changing the circuit. However, if you want to use a chip bug, you must let the eavesdropper's mobile phone make changes.

Copy the SIM card. Mobile phone hackers use SIM card programming devices to copy and clone designated SIM cards, and steal or answer other people's calls. This method is simple and easy to operate, but it is rarely used now because it is easy to be detected by the other party. The main purpose of this method is generally not eavesdropping, but stealing phone bills. If you rarely make calls on your mobile phone, but you have to pay hundreds of phone bills every month, it is very likely that your SIM card has been copied.