Evolution from 2G to 3G

2G networks were built for the most part for voice data and slow communication. Due to rapid changes in user anticipation, they do not meet today's wireless requirements. Cellular mobile telecommunications networks are being improved to use 3G technologies from 1999 to 2010. Japan was the first country to introduce 3G nationally, and in Japan the transition to 3G was largely completed in 2006. Korea then adopted 3G Networks soon after and the transition was made as early as 2004.

From 2G to 2.5G (GPRS)

2.5G and even 2.75G are technologies such as i-mode data services, camera phones, high-speed circuit-switched data (HSCSD) and General Packet Radio Service (GPRS) that present some functionality domains like 3G networks, but not including the full transition to 3G network. They were built to set up the potentials of wireless application technology to the end customers, and so increase demand for 3G services. When converting a GSM network...

From the operator's point-of-view, it is important that GPRS investments are re-used when going to UMTS. Also capitalizing on GPRS business understanding is very essential. From GPRS, operators could update the network directly to UMTS, or invest in an EDGE system. One advantage of EDGE over UMTS is that it involves no new licenses. The frequencies are also reused and no new antennas are needed.
Works Cited

Attewell, Jim and Smith, Carol Savill. Learning with Mobile Device. London: Learning and Skills Development Agency, 2004.

Hellberg, Chris, Greene, Dylan, and Boyes, Truman. Broadband Network Architecture. Boston: Pearson Education Inc., 2007.

Miceli, Andrew. Wireless Technician's handbook. Norwood: Artech House Inc., 2003.

Muller, Nathan J. Wireless a to Z. New York: McGraw Hill Companies Inc., 2003.