| Risk Management Headquarters | |
| Internal Control Office | 03-5434-1124 |
|---|---|
| Financial Control Department | 03-5434-1124 |
| Compliance Promotion Office | 03-5434-1369 |
| Management Control Headquarters | |
| Management Planning Division | 03-5434-1128 |
| Information System Division | 03-5434-0466 |
| Accounting Division | 03-5434-1129 |
| Group Business Promotion Division | 03-5434-1291 |
| General Affairs Division | 03-5434-1121 |
| Correspondence and Public Relation Division | 03-5434-1126 |
| Legal Affairs Office | 03-5434-1121 |
| Overseas Business Division | 03-5434-1189 |
| Human Resources Development Headquarters | |
| Human Resources Division | 03-5434-1125 |
| Human Resources Development Division | 03-5434-1196 |
| Ichikawa Training Center | 047-320-5863 |
| NTT Business Headquarters | |
| Planning Division | 03-5434-1131 |
| NTT Sales Division | 03-5434-1161 |
| Home and Office System Sales Division | 03-5434-1178 |
| Communication Wiring Engineering Division | 03-5434-1174 |
| Works Engineering Division | 03-5434-1171 |
| Network Engineering Division | 03-5434-1184 |
| Next Generation Network Promotion Office | 03-5434-5764 |
| DoCoMo Business Headquarters | |
| Planning Division | 03-5434-1163 |
| DoCoMo Sales and Marketing Division | 03-5434-1163 |
| New Business Marketing Division | 03(5434)1163 |
| DoCoMo Engineering Division | 03-5434-1186 |
| Technical Support Service Division | 03(5434)3460 |
| NCN Telecommunications Business Headquarters | |
| Planning Division | 03-5434-1152 |
| NCN Sales Division | 03-5434-1151 |
| NCN Engineering Division | 03-5434-1152 |
| Broadband Engineering Division | 03-5434-1158 |
| Wireless Business Headquarters | |
| Planning Division | 03-5434-1209 |
| Wireless Sales Division | 03-5434-1209 |
| Wireless Engineering Division | 03-5434-1209 |
| Technical Support Service Division | 03-5434-1209 |
| Broadcasting & Communication Business Division | 03-5434-3377 |
| IT Solution Business Headquarters | |
| Planning Promotion Division | 03-5434-3463 |
| Enterprise Business Division | 03-5434-1170 |
| IT Engineering Division | 03-5434-1145 |
| System Engineering Division | 043-296-6321 |
| System Solution Business Division | 06-6110-1500 |
| Civil Construction Business Headquarters | |
| Planning Division | 03-5434-3456 |
| General Sales Division | 03-5434-1148 |
| Koto Business Office 2-15-20, Shin-kiba, Koto-ku, Tokyo 136-0082 |
03(6275)0184 |
| Engineering Management Division | 03-5434-1144 |
| First Engineering Division | 03-5434-1144 |
| Second Engineering Division | 03-5434-1197 |
| Safety and Quality Management Headquarters | |
| Safety Control Division | 03-5434-1132 |
| Quality Assurance Division | 03-5434-1134 |
| CS Promotion Division | 03-5434-1149 |
| Procurement Headquarters | |
| Business Promotion Division | 03-5434-1146 |
| Construction Coordination Division | 03-5434-3373 |
| Materials Procurement Division | 03-5434-1494 |
| Technology Development Center | 03-5434-1398 |
| First-class Resistered Architects' Office | 03-5434-2591 |
| Internal Audit Office | 03-5434-1124 |
