Before German reunification, West Germany used country code +49 and East Germany used country code +37, each with its separate area codes and telephone networks. West Berlin was integrated into the West German telephone network, using the same +49 international dialling code as West Germany, with the area code 0311, [4] later changed to 030 . [5]

Telephone numbers in Europe are managed by the national telecommunications authorities of each country. The country calling codes start primarily with 3 and 4, ... (within Germany) 1 49 30 xxxx xxxx (within the EU) +3 49 30 xxxx xxxx (outside the EU) +49 30 xxxx xxxx (current system) Such a scheme would also have affected Spain which uses +34.