High-power portable signal jammer, a powerful solution that can completely block all nearby mobile phone signals, including standard GSM, new 3G models, and WiFi networks. It can be used worldwide.
This signal interference product is powerful and efficient, and can disable all nearby WiFi and 3G networks and other mobile phone signals (GSM, CDMA, DCS, PHS bands) without interrupting other electronic devices. The small size with easy-to-access activation buttons allows users to quickly turn the power on or off to immediately block different signals.
Generally, logically, the stronger your network is, the more difficult it is to block signals. Outdoors, it's not even worth trying unless you stick it to a phone you want to disrupt. Indoors, it all depends on the structure of the building and the strength of the signal it passes through. I got good results in the supermarket. E.g. In public transport: It also depends on the signal strength at time T; I have achieved excellent results on trains and buses, but not at stations, but in rural areas. The use of signal jammer products has a more obvious effect.