Why can't I change my Apple ID from phone number to email ID?
Why can't I change my Apple ID from phone number to email ID?
iPhone 13, iOS 16
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Now my Apple ID my mobile no I want chang… - Apple Community
August 2021 post by a Community Specialist about changing from a telephone number Apple ID to an email format:
"While it's possible to change your Apple ID to a different phone number, there isn't a way to change it to an email address."
There's more about using mobile numbers in Use your mobile phone number as your Apple ID - Apple Support