Hello @Onto3880,

welcome to the o2 community and thank you for your contribution.

I'm glad you decided to sign up for a contract with o2.
Of course, you can transfer your prepaid number to your fixed-term contract once you have signed it. The porting is free of charge. Your prepaid card will be deactivated after the porting process. Before porting, you only have to release your prepaid number. You can request this yourself in your My o2 portal or in the app.
You can find a detailed description of the porting process here:

Kind regards
Jessi

I currently have a prepaid SIM from O2 and I would like to release my o2 sim number. 

I just shift with other provider and i want same number i apply for portability but i still didn’t get it for that reason i have to write this letter.

Can you pleas help me with this i also call your help line number but still i didn’t get solution it’s been a long time.

Hello @BHAUTIK k.,

welcome to our o2 Community

The easiest way to release your phone number is in the Mein o2 App.

Alternatively, our telephone customer service can release the phone number for you to take to another provider.

Have you already solved your issue or do you need any further help? Then please let us know.

Best regards

Giulia