Telephone numbers in Europe are managed by the national telecommunications authorities of each country. The country calling codes start primarily with 3 and 4, however, some countries that by the Copenhagen criteria are considered part of Europe have country codes from the Asia range, starting with 9.
All telephone numbers are 9 digits long (initial 0 plus eight numbers). The first one, two, or three digits after the zero are the area code. The possible formats are: (0x) xxx xx xx, (0xx) xxx xxx, and (0xxx) xx xxx. Originally, there was only one provider of landline telephony, Telekom Slovenije.