It is often mentioned that the interference effect of mobile phone signal jammer will be weak if there is a wall. There are several possibilities:

First, look at the mobile phone signal jammer itself. The mobile phone signal jammer transmits radio frequency signals specifically for mobile phone signals. It will attenuate when encountering obstacles in the transmission path, and the error degree of different obstacles is different, such as steel-concrete wall or brick concrete wall facing the whole face, reinforced concrete wall and brick concrete wall facing two consecutive faces, which can basically attenuate the mobile phone signal jammer, Therefore, the mobile phone signal jammer usually can't go through the wall. After all, the mobile phone signal interference is not omnipotent. It doesn't have the ability of direct penetration. There will be some refraction and reflection when encountering the wall.

In some cases, the attenuation degree of mobile phone signal jammer is different with different wall materials. For example, if the wall is made of light steel keel gypsum board, its attenuation is small. Similarly, the attenuation of glass and wooden doors is also small. In addition, if the mobile phone signal jammer will also have some impact on the back of the wall through the open space of doors and windows, or through the reflection and refraction of the wall, so as to make people have the illusion of penetration ability.

If the mobile phone signal jammer wants to pass through the wall, it mainly depends on the material of the wall. There is also the site environment and the distance of the base station.