A beautiful diy gsm jammer or mobile cell phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 mobile phone network is used by USA, Canada and most of the countries in South America. This cell phone jammier is not applicable for use in Europe, Middle East, nor Asia. The GSM jammier circuit co
uld block mobile phone signals which works on GSM1900 band, also called DCS. For more cell phone jammers check the related posts.