The area code (phone code) 030 is assigned to 6 locations in Germany. Mainly you reach landlines in Berlin .
|030||Schöneiche bei Berlin|
|030||Schönefeld bei Berlin|
Note for calls from abroad: In addition to the German country code (+49 or 0049) you can omit the foregoing zero of the dialling code for Berlin. So you can dial +4930... and add the number of the phone line you want to reach.