Nowadays, many mobile phone users use dual-card mobile phones, that is, a mobile phone is installed with 2 SIM cards and has 2 mobile phone numbers, and the operators and mobile phone signal strengths of the 2 mobile phone numbers will be displayed on the mobile phone. on the screen. Then the question arises, when carrying a dual-card mobile phone into a workplace where a mobile phone jammer is installed, will a mobile phone jammer have the same shielding effect on the dual-card mobile phone? Is it completely shielding the mobile phone signals of the two SIM cards at the same time or will they have different shielding effects?

In response to this problem, we need to distinguish several situations for discussion. The first situation is that although the two SIM card numbers correspond to different mobile phone numbers, they both belong to the same communication operator, and the base stations currently registered to the network of the two SIM card numbers are the same base station. In this case, the strengths of the mobile phone signals received by the two mobile phone numbers in the mobile phone are almost exactly the same. Carry the mobile phone gradually close to the installation position of the mobile phone jammer, and the shielding effect reflected is basically the same. We will see that the signal of the two mobile phone card numbers of the mobile phone will gradually weaken until it completely disappears and the network is disconnected.

The second situation is that although the two SIM card numbers belong to the same operator, if it is a downtown area with many mobile phone users around, and there are many base stations, repeaters, and micro base stations, then the two SIM cards will It is possible to log in to different base stations and observe the signal strength on the mobile phone, and you will find that the signal strength of the two mobile phone numbers will be different. In such a situation, if the mobile phone is brought close to the mobile phone jammer, the effect of mobile phone shielding reflected will be different. It is possible that the signal that one of the mobile phone numbers has entered is blocked, while the other mobile phone number still maintains a signal and can still use this number for external communication.

The third case is that the two SIM card numbers belong to different communication operators. Since each operator has its own base station network, the two SIM card numbers will definitely be registered in different base stations. Because the base station is relative to the mobile phone user, the distance of the base station, the size of the base station’s transmission power, the installation height of the base station antenna, the angle and direction of the antenna’s radiation, and other factors will cause the signal strength received by the mobile phone user to be very different. The final result will be the same as the second case above. When the dual-card mobile phone is close to the coverage area of the mobile phone jammer, the mobile phone numbers of two different operators will still have different shielding effects. And if through detailed testing and comparison, we will even get some results like this: in the working environment of the same mobile phone jammer, the actual shielding distance will be different for mobile phone numbers belonging to different operators. The magnitude of this difference will vary with the working environment. The key factor affecting the magnitude of the change is the distance between the surrounding base stations in the working environment.