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In February, 2011,there was a conflict in Cairo. The situation was very difficult, the streets were full of protesters and the police try to stop all the protest actions and ask people to leave the Tahrir Square so that the peaceful atmosphere could be recovered.
To stop coordinated activities of protesters the government shot down the mobile connection in the whole city. In a few hours it was restored but jamming devices for local GSM frequency blocking were used in places of big crowds like on the Tahrir Square and other epicenters of riots in Cairo. Because of the usage of GSM jammers, the coordination of these groups via cell phones became impossible and the aggravation of the situation in the streets of Cairo was stopped. Also the usage of cell phone jammers made appliance of radio-controlled explosive devices of radical protesters impossible. Some explosive devices are activated via the signal of the mobile phone, and GSM jammers prevent the successful appliance of such bombs.
A cell phone jammer is a device designed to block any signals that mobile telephone sends and receives. This makes it impossible to successfully use the cell phone in the area where such a device is used. If you need to block GPS signals, you will need to use GPS jammers. Portable cell phone jammers initially were used by military organizations and special departments for safety purposes.
There is a wide range of such devices depending on the size, working range and price. There are also a lot of examples of successful civil appliance of cell phone jammers by people of different social and financial standings and professional activities. But it is obvious that the most important appliance of this jamming device is when there is danger connected with cooperative actions of aggressive or dissatisfied people around and blocking of GSM signals can be helpful in such situations.