Most country calling codes for the European Union countries start with +3x or +4x. The international access code has been standardised as 00.

Some countries that are considered by Copenhagen criteria part of Europe use numbers outside that range, namely the Asia range +9:

• +90 – Turkey
• +994 – Azerbaijan
• +995 – Georgia

There are two countries which are fully or partially located in Eastern Europe and Asia^{[citation needed]} but are considered part of Europe for cultural and historical reasons. They have been assigned country codes in the +3 range:

• +374 – Armenia
• +357 – Cyprus

European Union

• An "open" dialing plan is one in which there are different dialing arrangements for local and long distance telephone calls. This means that to call another number within the same city or area, callers need dial only the number, but for calls outside the area, an area code is required. In a "closed" plan, the number dialed is the same, regardless of where in the country the call originates.

Other European countries