https://www.o2online.de/assets/blobs/pdfs/besitzerwechsel-o2-prepaid/

Hi

Thanks for your response.

The given link contains the form so after filling the form what should be done next?

Hi @Anusingh ,
thank you very much for your request regarding changing the ownership of a prepaid contract.

Please send the form to the adress written in the top right corner,

After receipt of this form, you will receive a contract summary and other mandatory legal information to the e-mail address you entered here. We will then send you a
Postident coupon to you. If you wish to change ownership on the basis of the information sent to you, you can register with the
Postident-Coupon at your local post office. The change of ownership to the new owner will only be carried out after successful legitimation.

best regards
Michael