The area code (phone code) 03868 is assigned to 4 locations in Germany. Mainly you reach landlines in Rastow (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 Rastow. So you can dial +493868... and add the number of the phone line you want to reach.