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The second 3G network operator in the USA was Verizon Wireless in July 2002 also on CDMA2000 1x EV-DO.
AT&T Mobility is also a true 3G UMTS network, having completed its upgrade of the 3G network to HSUPA.
The first pre-commercial 3G network was launched by NTT Do Co Mo in Japan in 1998, branded as FOMA.
It was first available in May 2001 as a pre-release (test) of W-CDMA technology.
The following common standards comply with the IMT2000/3G standard: While DECT cordless phones and Mobile Wi MAX standards formally also fulfill the IMT-2000 requirements, they are not usually considered due to their rarity and unsuitability for usage with mobile phones.
The 3G (UMTS and CDMA2000) research and development projects started in 1992.
The following standards are typically branded 3G: The above systems and radio interfaces are based on spread spectrum radio transmission technology.
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.
While EDGE fulfills the 3G specifications, most GSM/UMTS phones report EDGE ("2.75G") and UMTS ("3G") functionality.
3G technology is the result of research and development work carried out by the International Telecommunication Union (ITU) in the early 1980s.
The communication spectrum between 400 MHz to 3 GHz was allocated for 3G.
Both the government and communication companies approved the 3G standard.
3G finds application in wireless voice telephony, mobile Internet access, fixed wireless Internet access, video calls and mobile TV.