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Upload: 890–915, Download: 935–960.GSM-900 is used in most parts of the world: Europe, Middle East, Africa, Australia, Oceania (and most of Asia). GSM-900 uses 890–915 MHz to send information from the mobile station to the base station (uplink) and 935–960 MHz for the other direction (downlink), providing 124 RF channels (channel numbers 1 to 124) spaced at 200 kHz. Duplex spacing of 45 MHz is used. Guard bands 100 kHz wide are placed at either end of the range of frequencies.

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