Liechtenstein Liechtenstein (), officially the Principality of Liechtenstein (german: link=no, Fürstentum Liechtenstein), is a German-speaking microstate located in the Alps between Austria and Switzerland. Liechtenstein is a semi-constitutional monarch ...

previously used the Swiss telephone numbering plan (+41) under area code 075. (This was dialled as +41 75 from outside Switzerland and Liechtenstein). 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. Liechtenstein Numbering Plan (ITU-T E.164)

References

Telecommunications in Liechtenstein Liechtenstein-related lists Liechtenstein–Switzerland relations {{Telephonenumber-stub