All wireless phones sold today are digital phones. This means that although the traffic (voice, data, and/or video) that is sent through the air still uses an analog sine wave to be transmitted, the information transmitted “on top of” the sine wave is all digitized—it’s all ones and zeroes.
These digital phones come in several types. First, there are multimode digital phones. These are phones that operate in two or more digital wire-less technology modes—for example, a phone that operates using the Code Division Multiple Access (CDMA) digital wireless standard as well as the Global System for Mobile communication (GSM) digital wireless standard. Along with multimode digital wireless phones, there are also dual or multiband phones. Multiband phones are phones that operate in two or more frequency ranges: for example, a wireless phone that operates in the 850 MHz cellular frequency band (in the United States) as well as the 1,900 MHz PCS band. Today’s digital wireless phones can operate using both multimode and multiband functionality at the same.
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