There are cases when mobile network codes are occupied not by mobile carriers, but government structures (military, railway, landline phone authorities), fixed and broadband internet providers, scientific organisations, etc. Some MCCMNCs belong to obsolete legal entities, acquired by other market players or went to bankruptcy, but codes are kept for a certain period for legacy purposes.
| Brand name | Y!mobile (ワイモバイル株式会社) |
|---|---|
| Other names | Ymobile Corporation, Yahoo! Japan, Softbank, WILLCOM |
| Mobile users | 39 505 000 mobile users (report dated 22/12/2024) |
| MCCMNC code | 44000 |
| Mobile network code (MNC) | 00 |
| Mobile country code (MCC) | 440 |
| Mobile Number Portability (MNP) | No |
| Web |
