3G, also known as third generation or IMT-2000, is a set of standards for mobile devices that provides for improved voice, data and video services. The technology is primarily in use in Europe, Japan and the United States.

Features

The 3G standard describes a host of technologies that includes CDMA2000, EDGE, GSM, DECT, WiMax and UMTS. Generally, these 3G technologies allow for faster data transfer and make more efficient use of the radio spectrum, thereby enabling more powerful mobile applications.

Origins

Defined by the International Telecommunication Union (ITU), the 3G standard builds on the so-called 1G, 2G, 2.5G and 2.75G mobile communications standards set forth by the ITU throughout the past several decades.

Viewpoints on Definition

The ITU notes that there are different views about what exactly qualifies as a 3G network. Considerable debate remains as to whether technologies that slowly evolved to meet 3G standards should actually be considered 3G, or if that designation should belong to technologies developed from scratch.

Popular Recognition

3G has gained popular recognition in the United States, as the term is a selling point on the mobile "smart" devices that have gained popularity in recent years. The iPhone 3GS took this name recognition to the next level when it incorporated the mobile standard into its product name.

Then Next Generation

The next generation of mobile standards has already being defined. The so-called 4G technology is to feature even greater data transfer rates and improved integration of distinct networks.

Source:

ITU: What Really is a Third Generation (3G) Mobile Technology?

Radio Shack: Wireless Telecommunications Comparison Chart

ITU: About Mobile Technology and IMT-200