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11, 01. 2004
Cell phone carriers
Leading telecommunication company of NTT group. It maintains overwhelming market share of 60% in mobile phones, maintaining strong brand name. (English) (Global)
The company with the 2nd largest market share in mobile phone business (known as its brand name au). Taking over another telecommunications company TU-KA Cellular Tokyo and two other related companies in 2005. (au website)
Major PHS (Personal Handy-phone System) operator in Japan, with 3.65 million subscribers (as of Dec. 2005). Launched industry's first fixed-rate voice service in May 2005.
Home/Office phone carriers
Japan's telecommunication giant. The largest share of regional telecommunication service, which is divided into two companies: NTT East and NTT West. (NTT Group) (NTT East) West)
The second largest carrier next to NTT.
The company that acquired JAPAN TELECOM in 2004. (JAPAN TELECOM website)
The competent authorities
Ministry of Internal Affairs and Communications (MIC)
The ministry offers information on telecommunication policies, applicable laws and statistics.
Telecommunications industry organizations
Telecommunications Carriers Association (TCA)
TCA offers database on the industry, including the number of subscribers to mobile phone services. It also publishes annual reports of the industry.
National Institute of Information and Communications Technology (NICT)
The organization offers data obtained from ionosphere sounding and solar observations. Public institution to determine the standard values for time and frequency.
Communications and Information network Association of Japan (CIAJ)
Policy recommendations and statistics on the industry are available on the website.
Research Institute of Telecommunications and Economics (RITE)
The institute conducts researches in telecommunications, postal services, logistics and financial services.

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