Cell phones use frequencies within four different frequency bands
GSM cell phones use frequencies within four different frequency bands :
• 850 MHz (824.2 - 848.8 MHz Tx; 869.2 - 893.8 MHz Rx)
• 900 MHz (880-2 - 914.8 MHz Tx; 925.2 - 959.8 MHz Rx)
•1800 MHz (1710.2 - 1784.8 MHz Tx; 1805.2 - 1879.8 MHz Rx)
•1900 MHz (1850.2 - 1909.8 MHz Tx; 1930.2 - 1989.8 MHz Rx)
Although 850 and 900, and 1800 and 1900 are very close together, a phone that works in one frequency band unfortunately can not also work in the frequency band next to it unless added as a specific extra frequency band. For comparison, when you have your FM radio tuned to a radio station at 98.1 MHz, there's no way you'll hear what is happening on another radio station at 98.3 MHz unless you retune your radio
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