Hi @NewBerliner,
Where did you buy the SIM card? And it's a Vodafone prepaid (CallYa) SIM card?
When in a normal shop (e.g. kiosk, grocery, petrol station etc.) then you have to identify and register your SIM card at this website (only German) first.
Feel free to use English language furthermore.
@Mir_von_hier
In this community the users can use German and English language as well. 😉
Nachtrag:
@Mir_von_hier
Deinen letzten in Russisch geschriebenen Beitrag habe ich in die Plauderecke verschoben.