The area code (phone code) 07131 is assigned to 3 locations in Germany. Mainly you reach landlines in Heilbronn (Neckar) (Baden-Württemberg).
|07131||Flein bei Heilbronn, Neckar|
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 Heilbronn (Neckar). So you can dial +497131... and add the number of the phone line you want to reach.