Changing apple id
How do I change my apple id from a phone number to an email?
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Ask Apple if this is possible. I only see reference to changing number IDs to other numbers.
Change your Apple ID to a different mobile phone number --> https://support.apple.com/en-us/HT207944#change-appleid
Contact Apple for help with Apple ID account security - Apple Support
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