Thirteen cities and provinces nationwide will have their new area codes for landline numbers changed to a three-digit number since February 11.
| Province/city | Old code | New code |
| Son La | 22 | 212 |
| Lai Chau | 231 | 213 |
| Lao Cai | 20 | 214 |
| Dien Bien | 230 | 215 |
| Yen Bai | 29 | 216 |
| Quang Binh | 52 | 232 |
| Quang Tri | 53 | 233 |
| Thua Thien-Hue | 54 | 234 |
| Quang Nam | 510 | 235 |
| Da Nang | 511 | 236 |
| Thanh Hoa | 37 | 237 |
| Nghe An | 38 | 238 |
| Ha Tinh | 39 | 239 |
During the transition period, which will last for about one month from the date the new codes take effect, users can dial landline numbers using either the old or new codes.
Nhật Phương (nguồn news.chinhphu.vn)
