Phone numbers in Luxembourg employ a open dialling system, whereby all numbers are dialed in the same format whether from within Luxembourg or from abroad. There is no trunk " 0 ".The incumbent operator employed an open numbering plan, where a two-digit area identifier is followed by one to four digits, all 6 digits formed the subscriber number. This has been changed by the introduction of a new numbering plan in 1999 . Phone numbers introduced since May 2000 by the incumbent operator begin with " 2 " (generally 26, 24 and recently 27 ) followed by two to 6 digits. The area identifier is still present and generally following the 26, 27 or 24, however numbers can be taken to any other area.