In Case of CDMA Technology,where the mobile phones can be used only on those networks, they may find if they go to other parts of the world, such as Europe, their cellular phones will not work.Whereas GSM works almost throughout world.
Another distinctive feature of the GSM system is the use of SIM cards. This card will store all personal data and contacts on it which can be easily portable when shifting to a new one.
GPRS ( General packet radio service ) is a mobile data service available to users of the 2G cellular communication systems global system for mobile communications (GSM), as well as in the 3G systems.
Almost all the networks are being converted to use the GSM standard, so that GSM is the only kind of network where GPRS data service is in use.
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