The area code (phone code) 07121 is assigned to 5 locations in Germany. Mainly you reach landlines in Reutlingen (Baden-Württemberg).
|07121||Eningen unter Achalm|
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 Reutlingen. So you can dial +497121... and add the number of the phone line you want to reach.