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The scope of 3GPP was make a globally applicable third generation (3G) mobile phone system specification within the scope of the ITU's IMT-2000 project.
3GPP specifications are based on evolved GSM specifications, now generally known as the UMTS system.
Note that 3G Networks based on IS-95 (CDMA) networks, commonly known as CDMA2000, are specified by a different group confusingly known as 3GPP2.