| Risk Management Headquarters | |
| Internal Control Office | 03-6807-3723 |
|---|---|
| Compliance Promotion Office | 03-6807-3718 |
| Management Control Headquarters | |
| Management Planning Division | 03-6807-3714 |
| Information System Division | 03-6807-3715 |
| Accounting Division | 03-6807-3774 |
| General Affairs Division | 03-6807-3700 |
| Legal Affairs Office | 03-6807-3712 |
| Correspondence and Public Relation Division | 03-6807-3711 |
| Overseas Business Division | 03-6807-3747 |
| Human Resources Development Headquarters | |
| Human Resources Division | 03-6807-3720 |
| Human Resources Development Division | 03-6807-3721 |
| Ichikawa Training Center | 047-320-5863 |
| NTT Business Headquarters | |
| Planning Division | 03-6807-3730 |
| NTT Sales Division | 03-6807-3731 |
| Communication Wiring Engineering Division | 03-6807-3733 |
| Works Engineering Division | 03-6807-3737 |
| Network Engineering Division | 03-6807-3738 |
| Next Generation Network Promotion Office | 03-6807-3738 |
| DoCoMo Business Headquarters | |
| Planning Division | 03-6807-3750 |
| DoCoMo Sales and Marketing Division | 03-6807-3750 |
| New Business Marketing Division | 03-6807-3750 |
| DoCoMo Engineering Division | 03-6807-3753 |
| Technical Support Service Division | 03-6807-3760 |
| NCN Telecommunications Business Headquarters | |
| Planning Division | 03-6807-3765 |
| NCN Sales Division | 03-6807-3765 |
| NCN Engineering Division | 03-6807-3766 |
| Broadband Engineering Division | 03-6807-3768 |
| Wireless Business Headquarters | |
| Planning Division | 03-6807-3770 |
| Wireless Sales Division | 03-6807-3770 |
| Wireless Engineering Division | 03-6807-3771 |
| Technical Support Service Division | 03-6807-3772 |
| Broadcasting & Communication Business Division | 03-6807-3773 |
| IT Solution Business Headquarters | |
| Planning Promotion Division | 03-6807-3740 |
| Enterprise Business Division | 03-6807-3741 |
| Home and Office System Sales Division | 03-6807-3732 |
| IT Engineering Division | 03-6807-3742 |
| System Engineering Division | 03-6807-3745 |
| System Solution Business Division | 06-6110-1500 |
| Civil Construction Business Headquarters | 03-6807-3780 |
| Planning Division | 03-6807-3780 |
| General Sales Division | 03-6807-3781 |
| Sinagawa Business Office 3-20-11, Minami-Ooi, Sinagawa-Ku, Tokyo 140-0013 |
03(3763)5301 |
| Engineering Management Division | 03-6807-3782 |
| First Engineering Division | 03-6807-3783 |
| Second Engineering Division | 03-6807-3784 |
| Safety and Quality Management Headquarters | |
| Safety Control Division | 03-6807-3725 |
| Quality Assurance Division | 03-6807-3726 |
| CS Promotion Division | 03-6807-3727 |
| Procurement Headquarters | |
| Business Promotion Division | 03-6807-3791 |
| Construction Coordination Division | 03-6807-3792 |
| Materials Procurement Division | 03-6807-3790 |
| Technology Development Center | 03-6807-3796 |
| First-class Resistered Architects' Office | 03-6807-3795 |
| Internal Audit Office | 03-6807-3708 |
