UMTS

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Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) mobile telephone technologies. It uses W-CDMA as the underlying standard, is standardized by the 3GPP, and is the European answer to the ITU IMT-2000 requirements for 3G Cellular radio systems.

To differentiate UMTS from competing network technologies, UMTS is sometimes marketed as 3GSM, emphasizing the combination of the 3G nature of the technology and the GSM standard which it was designed to succeed.

For a more complete definition, see [1].

Real-world Implementations

The first large scale real-life commercial UMTS network in the world went live in 2001 in Japan, operated by NTT DoCoMo.

Beginning in 2003 under the name 3, Hutchison Whampoa gradually launched their startup UMTS networks worldwide including Australia, Austria, Denmark, Hong Kong, Italy, Great Britain, Ireland and Sweden.

US provider AT