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3G refers to the third generation of cellular network technology. These networks were rolled out beginning in the early 2000s and represented a significant advancement over the second generation (2G), particularly in terms of data transfer speeds and mobile internet capabilities. The major 3G standards are UMTS and CDMA2000 ; both of these are based on the IMT-2000 specifications established by the International Telecommunication Union (ITU).
3G mobile telephony was relatively slow to be adopted globally. In some instances, 3G networks do not use the same radio frequencies as 2G so mobile operators must build entirely new networks and license entirely new frequencies, especially so to achieve high data transmission rates. Other delays were due to the expenses of upgrading transmission hardware, especially for UMTS, whose deployment required the replacement of most broadcast towers. Due to these issues and difficulties with deployment, many carriers delayed acquisition of these updated capabilities.
NTT Docomo, Inc. , also known as Docomo , is a Japanese mobile phone operator owned by the Nippon Telegraph and Telephone (NTT). The name is officially an abbreviation of the phrase, "do communications over the mobile network", but is also from Japanese どこも. The company is headquartered in Sanno Park Tower, Nagatachō, Chiyoda, Tokyo. Docomo provides phone, video phone, i-mode (internet), and mail services. It is the largest wireless carrier in Japan, with 82.632 million subscribers as of March 2021.
October 1 is the 274th day of the year in the Gregorian calendar; 91 days remain until the end of the year.