Xbox Microsoft subscriptions?

Hello I have a question and I have taken this offer from the Xbox Game pass Ultimate and pay 1 euro and 2 months free of charge with the billing via the Microsoft account balance and then still via O2 mobile phone contract because of the recurring bill then I have the made away again so in the settings recurring billing deactivated and then there was the last charge on 01/25/21 everything well and good, I paid yes but if I want to remove the mobile phone bill it is still used for the ultimate game pass like can I change that or remove it best

Logical.

As long as you have that, you will need something where the bill can be paid from.

You can only deactivate recurring billing

If I have deactivated it then I still have to pay something no or

No. That's why you activated it. But thanks to your question, I've done that too. I just waited for an offer ^^