Hello @abhay0609 and thank you for the pleasant call. 

I'm happy that I could answer all of your questions. To cancel your current prepaid plan and take your number with you to another provider, please fill out the following form, which you can find here.

Please make sure to indicate the transfer of the phone number in the appropriate place in the form, simply select "Ja" at "Möchten Sie Ihre Rufnummer zu einem anderen Anbieter mitnehmen?".

Feel free to write again If there's anything else I may help you with. Have a nice evening and a sunny rest of the week. 🌇

Kind regards

Malte