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in Phone equipments by mousumi101

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These are,

GSM 900 / GSM 1800 MHz are used in most parts of the world: Europe, Asia, Australia, Middle East, Africa.

GSM 850 / GSM 1900 MHz are used in the United States, Canada, Mexico and most countries of S. America.
by onyiuzo
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Most mobile carrier stations use the 800 MHz frequency band. In fact , one can find both AMPS and IS-95 networks in use on the same frequency in the same area that use different channels to carry data. The actual frequency used by a particular phone depends on the settings of the carrier's base station.
by bhaskar

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