<P> While DECT cordless phones and Mobile WiMAX standards formally also fulfill the IMT - 2000 requirements, they are not usually considered due to their rarity and unsuitability for usage with mobile phones . </P> <P> The 3G (UMTS and CDMA2000) research and development projects started in 1992 . In 1999, ITU approved five radio interfaces for IMT - 2000 as a part of the ITU - R M. 1457 Recommendation; WiMAX was added in 2007 . </P> <P> There are evolutionary standards (EDGE and CDMA) that are backward - compatible extensions to pre-existing 2G networks as well as revolutionary standards that require all - new network hardware and frequency allocations . The cell phones utilise UMTS in combination with 2G GSM standards and bandwidths, but do not support EDGE . The latter group is the UMTS family, which consists of standards developed for IMT - 2000, as well as the independently developed standards DECT and WiMAX, which were included because they fit the IMT - 2000 definition . </P> <P> While EDGE fulfills the 3G specifications, most GSM / UMTS phones report EDGE ("2.75 G") and UMTS ("3G") functionality . </P>

Which one of the following pairs is the third generation 3g mobile telecommunication