- CHUBU Telecommucications Co., Inc (CTC)
- UQ Communications Inc (UQ)
- JCOM Co., Ltd.
- K-Opticom Corporation (KOPT)
- STNet, Incorprated (STNet)
- Energia Communications, Inc.
- Kyushu Telecommunication Network Co., Inc. (QTNet)
- Okinawa Telecommunication Network Co., Inc. (OTNet)
- UQ mobile Okinawa Corporation