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A definition of CDMA

The Allies in World War II developed Code Division Multiple Access (CDMA) to prevent Nazis from jamming radio transmissions. With CDMA, the Allies transmitted information over several frequencies, making it difficult for the Germans to get the figure out the signal. Over the decades, CDMA has grown to be one of the two major radio systems used in cell phones; the other is Global System for Mobiles, or GSM. Both CDMA and GSM signals keep networks and carriers divided. For example, in the United States, Sprint, Verizon, and U.S. Cellular use CDMA, but AT&T and T-Mobile use GSM.

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