| District | Prefix/Format |
| Brunei / Muara | |
| Kg Ayer | 220 XXXX |
| 221 XXXX | |
| Central | 222 XXXX |
| 223 XXXX | |
| 224 XXXX | |
| 225 XXXX | |
| Subok | 226 XXXX |
| Madang | 231 XXXX |
| 233 XXXX | |
| 234 XXXX | |
| IBC | 236 XXXX |
| Pulaie | 232 XXXX |
| 238 XXXX | |
| Berakas | 239 XXXX |
| Tungku (DST) | 241 XXXX |
| Gadong | 242 XXXX |
| 243 XXXX | |
| 244 XXXX | |
| 245 XXXX | |
| Rimba | 246 XXXX |
| Katok | 247 XXXX |
| Jerudong | 261 XXXX |
| Junjungan | 264 XXXX |
| Mediwa | 265 XXXX |
| Sengkurong | 266 XXXX |
| 267 XXXX | |
| 269 XXXX | |
| Kg Masin | 268 0XXX |
| 268 1XXX | |
| Limau Manis | 268 3XXX |
| Kupang | 268 5XXX |
| Muara | 277 XXXX |
| Serdang | 278 XXXX |
| Salar | 279 XXXX |
|
Kuala Belait |
|
| Seria | 322 XXXX |
| Sg Liang | 323 0XXX |
| Labi | 323 3XXX |
| Sg Taring | 323 6XXX |
| 324 XXXX | |
| Mumong | 333 XXXX |
| 334 XXXX | |
| Sg Teraban | 336 4XXX |
| Panaga (Brunei Shell) | 337 XXXX |
|
Tutong |
|
| Tutong | 422 XXXX |
| 426 XXXX | |
| Kiudang | 423 0XXX |
| Penanjong | 423 3XXX |
| Lamunin | 423 7XXX |
| Sinaut | 424 0XXX |
| Tg Maya | 424 2XXX |
| Telisai | 424 4XXX |
| Bt Beruang | 424 7XXX |
|
Temburong |
|
| Bangar | 522 XXXX |
| Rataie | 523 XXXX |
| Labu | 524 XXXX |
| Sumbiling Baru | 525 XXXX |
| Lepong Baru | 526 XXXX |
| Selapon | 527 XXXX |
|
Mobile Services |
Prefix/Format |
| DST Com (GSM 900) | 86X XXXX |
| 87X XXXX | |
|
88X XXXX | |
| Paging | 85X XXXX |