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jeffhoard
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BEST ANSWER  chosen by asker   |  jeffhoard  |  January 26, 2009 08:37 PM
GSM and CDMA are 2 Digital mobile telephony systems.

GSM operates at 900 MHz or 1800 MHz frequency band
CDMA operates on 800-MHz and 1.9-GHz bands

GSM phones also use SIM Cards where CDMA don't

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