How to deregister phone number, when no longer in possession of phone
I have traded in my iphone 11 but did not deregister the phone number, how can I deregister this number from my apple id without having the phone or access to it or phone number?
If you still have problems:
Contact Apple. Click here --> https://support.apple.com/choose-country-region Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
or:
Contact Apple for support and service --> "See a list of Apple phone numbers around the world."
Click here --> https://support.apple.com/HT201232