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in Calling Cards by bhaskar

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CDMA (Code Division Multiple Access) and GSM (Global System for Mobiles) are shorthand for the two major radio systems used in cell phones. Both acronyms tend to group together a bunch of technologies run by the same entities.
by arnoldphillip
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The real differences—the ones that you should care about—are more obvious. Both GSM and CDMA standards outline a way that phones are identified by carriers. In GSM phones, it's a removable chip called a SIM card. ... And that leads us to the main reason you'll need to consider when choosing between CDMA vs. GSM: travel.
by sasikumar

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