| By Popularity
| Alphabetical (What's This?)|
Provides international telecommunications services in Japan, Brasil and the USA. Callback and direct phone call systems available.
- Jupiter Telecommunications Co., Ltd.
Operating cable TV, broadband Internet access, and telephony services in Japan.
- Nippon Telegraph and Telephone (NTT)
Global group of regional, long-distance, mobile, and data communications service providers and other diversified businesses.
- Nokia Japan
- Seikosha, Inc.
Designs and manufactures custom communication systems with applications in broadcasting, railways, electric power utilities and law enforcement.