3G is short for 3rd Generation system for mobile communications. The 3rd generation consists of a family of standards under the framework of IMT-2000. Under this framework, a number of standards is developed. The European version is known as UMTS. The main other standards are CDMA2000 and Mobile WiMax.
The third generation is typified by the convergence of voice and data with mobile Internet access, multimedia applications and high data transmission rates. The 3rd generation must make worldwide roaming possible.