SIM(Subscribers Identity Module)
GSM: The phones using GSM techonology uses SIM cards by which we can easliy activated , swapped and interchanded , You can easly upgrade or change your handset just by swapping the SIM card of your phone no an another.SIM card is directly connected to the network.SIM card also have some memory in which your can store your contact numbers and messages you received.
CDMA: The phones using CDMA technology uses R-UIM card which can be swapped only between some handsets which supports CDMA technoloy.Some phones regarding CDMA work without UIM cards , only operator can change your number, In this type you have a option of saving your contact details with the operator and retrive them when you change your handset or your handset is lost.
DATA TRANSFER
GSM: GSM uses two different technologies First one is EDGE(Enhanced Data rates for Gsm Evolution) which gives a average speed of 70-140kbps and the second one is GPRS(General Packet Radio Service).
CDMA: CDMA uses EVDO(Evolution Data Optimized) technology for data transfer which gives a average speed of 300-700kbps.
GLOBAL TRAVELING
GSM & CDMA: When international travel is an issue, GSM leaps forward in the race for the title of “Most Accessible.” Because GSM is used in more than 74% of the markets across the globe, users of tri-band or quad-band handsets can travel to Europe, India, and most of Asia and still use their cell phones. CDMA offers no multiband capability, however, and therefore you can’t readily use it in multiple countries.
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