Liechtenstein +423
Number Format
Area Code: none
Subscriber Number: 7 digits (see note below)
Trunk Prefix: n/a
International Prefix: 00
(Note: special services other than the fixed or mobile networks could have subscriber numbers between 7 and 12 digits).
5 April 1999 - new country code +423 for Liechtenstein
The Principality of Liechtenstein has been served via Switzerland's telephone system. As of 5 April 1999, country code 423 is in effect for Liechtenstein, leaving the Switzerland numbering plan (previously +41 75 then Liechtenstein subscriber number).
References to +423 and the installation of international switching capability can be found in the FirstLink telecom documents: FirstLink - business.htm and FirstLink - actual.htm.
Also see More +423 information from www.ak.li.
An overview of the Liechtenstein numbering plan is also available, written in the principality's German dialect.
ITU also announced the introduction of +423 in Operational Bulletin #660 (only the table of contents of the bulletin is likely to be openly accessible via its website).
Another reference to +423 in service is in this KDDI bulletin of 25 December 1998. (additional info courtesy Markus Laesser, Liechtenstein Office for Communications)