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http://www.perfectjammer.com/all-gsm-3g-jammers-blockers.html The frequency ranges for each GSM Frequency band are different, with frequencies ranging from 380.2 to 1990 Mhz. 921 Mhz to 1710.1 Mhz fequencies are not assigned to GSM bands and are assigned to other tasks by the FCC. Each GSM frequency band also makes use of a separate uplink and downlink frequency range within each pre-designated band. The uplink and downlink ranges are distinguished from each other in order to help minimize potential interference.



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