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The following standards are typically branded 3G: The above systems and radio interfaces are based on spread spectrum radio transmission technology.While the GSM EDGE standard ("2.9G"), DECT cordless phones and Mobile Wi MAX standards formally also fulfill the IMT-2000 requirements and are approved as 3G standards by ITU, these are typically not branded 3G, and are based on completely different technologies.
The first commercial United States 3G network was by Monet Mobile Networks, on CDMA2000 1x EV-DO technology, but this network provider later shut down operations.
The communication spectrum between 400 MHz to 3 GHz was allocated for 3G.
Both the government and communication companies approved the 3G standard.
Services advertised as 3G are required to meet IMT-2000 technical standards, including standards for reliability and speed (data transfer rates).
To meet the IMT-2000 standards, a system is required to provide peak data rates of at least 200 kbit/s (about 0.2 Mbit/s).
A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1981/1982.
Each generation is characterized by new frequency bands, higher data rates and non–backward-compatible transmission technology.
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The first commercial launch of 3G was also by NTT Do Co Mo in Japan on 1 October 2001, although it was initially somewhat limited in scope; The first European pre-commercial network was an UMTS network on the Isle of Man by Manx Telecom, the operator then owned by British Telecom, and the first commercial network (also UMTS based W-CDMA) in Europe was opened for business by Telenor in December 2001 with no commercial handsets and thus no paying customers.
The first network to go commercially live was by SK Telecom in South Korea on the CDMA-based 1x EV-DO technology in January 2002.
The first 3G networks were introduced in 1998 and fourth generation 4G networks in 2008.