how to deactivate the call forwarding of my hungary number

I just wanted to clarify- are you saying that your T-Mobile phone number is forwarding to a different device or do you have another number that is forwarding to your T-Mobile device?

If it’s the former, you can call ##21# from your T-Mobile phone or contact your Team of Experts for further assistance.

If it’s the latter, you might want to reach out to the other number’s carrier.

Hope this helps!