Hi!

Normally, o2 cancels prepaid cards themselves if they are no longer topped up after 6 months. But you can also send a cancellation to the o2 prepaid customer service in Nuremberg.

Telefónica Germany GmbH & Co. OHG
O2 Prepaid-Kundenbetreuung
90345 Nürnberg

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Sehr geehrte Damen und Herren,
hiermit kündige ich (your name), geboren am (date of birth), Wohnhaft (your adress in Germany) meinen o2 Prepaid Vertrag mit der Mobilfunknummer (phone number of your o2 sim) mit der SIM Seriennummer (serial number of your sim card on the front of the sim - iccid) zu sofort.

Mit freundlichen Grüßen
(your name and sign)

Hello @Preethi555,

welcome to the o2 community!

I see you have already received the best support from @tearsbeforecrying. Thank you very much for that.
Your question seems to be answered conclusively for me. Can you confirm this or do you have any further questions?

Kind regards
Jessi