Dual band
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In mobile phones, dual band (also known as dual-band or dualband) refers to functionality that allows a cellphone to support two frequency bands out of the four major GSM (or TDMA) bands. This is important because different countries peg the allowed transmission frequency at different values. A cellphone with dual band 850/1800 MHz, for example, will work in both the United States (850 MHz) and India (1800 MHz).
