Hello @Takak,

you can release your phone number by letter, fax, e-mail, in the chat and by telephone to take it to another provider. Unfortunately, this is not possible here via the community.

Written cancellation is not mandatory, the card will deactivate itself after a certain period of time. If you want to have the remaining balance refunded, please use this form: Prepaid - Guthabenauszahlung

Please let us know if you have any further questions.

Best regards

Giulia