The german phone code 038733 represents Karbow-Vietlübbe in Mecklenburg-Vorpommern.
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 Karbow-Vietlübbe. So you can dial +4938733... and add the number of the phone line you want to reach.