The german phone code 02409 represents Stolberg-Gressenich in Nordrhein-Westfalen.
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 Stolberg-Gressenich. So you can dial +492409... and add the number of the phone line you want to reach.
Wich place is a "must see" for a tourist in Stolberg-Gressenich?