Code Division Multiple Access (CDMA) is an alternative to GSM, originally developed as a proprietary cellular technology by Qualcomm but subsequently used as the basis for new international telecommunications standards, including the ITU's CDMA2000 specifications. There are numerous websites where you can learn more about GSM, CDMA, and their 3G successors -- for example, see Wikipedia's mobile telephony index for links to articles about these and many related technologies.
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