lost sim card prepaid need to port my number to another operator.

Hello @tahir696, 

to release your number, you have to declare that you allow the new provider to order the transfer of the number. 

You can actually set up the porting declaration yourself via Mein o2. Since you no longer have the access data, please contact our prepaid hotline.

You can find the number here: Kontakt aufnehmen und Hilfe finden | o2 (o2online.de)

Best regards
Cora