Telephone numbers in Liechtenstein
previously used the Swiss telephone numbering plan under area code 075.. However, on 5 April 1999, it adopted its own international code +423. Consequently, calls from Switzerland now require international dialling, using the 00423 prefix and the seven-digit number.
| Leading digit | Number of digits | Services |
| 1 | 3–4 | Access codes |
| 2 | 7 | Fixed-line services |
| 3 | 7 | Fixed-line services |
| 4 | 7 | reserved |
| 5 | 9 | reserved |
| 60–68 | 9 | International mobile services |
| 69 | 9 | Voicemail services for national mobile services |
| 7 | 7 | National mobile services |
| 80 | 7 | Special services: Free services |
| 81–83 | 7 | Special services |
| 84 | 7 | Special services: Split-cost services |
| 85–86 | 7 | Special services |
| 87 | 7 | Special services: Fixed-cost services |
| 88 | 7 | Special services |
| 89 | 7 | Special services: Personal number services |
| 900 | 7 | Premium services: Business, marketing |
| 901 | 7 | Premium services: Entertainment, games, callback |
| 902–905 | 7 | Premium services |
| 906 | 7 | Premium services: Adult entertainment |
| 907–999 | 7 | Premium services |
Liechtenstein Numbering Plan