A wonderful diy gsm jammer or cellular mobile phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 cellular cell phone network is made use of by USA, Canada and most of the nations in South America. This cellular phone jammer isn`t applicable for use in Europe, Center East, nor Asia. The GSM
jammer circuit could block mobile mobile phone signals which operates on GSM1900 band, also identified as DCS.