Clarify the scope of the shielded area, whether it is a key area (or inside a building) in the prison area or the entire enclosed compound;
Clarify the expected planning and effects of the signal jammer project, including the planning funds for the entire mobile phone shielding project, whether it is generally only to install the shield to achieve the shielding effect or to conduct scientific and intelligent centralized control shielding;
Prepare a plan of the unit and mark the name, layout, size, and floor height of each building in the prison area. At the same time, the surrounding environment of the prison should also be marked, especially the location of office areas, residential houses or social factories and enterprises within a few hundred meters of the fence;
Divide key shielded areas, non-key shielded areas and areas that do not need to be shielded;
Understand the distribution of base stations around the prison (location and communication company);
Be prepared for on-site surveys and tests by distributors or manufacturers of mobile phone shielding system construction projects.