How to change my Apple ID in App Store on my iPhone
How to change my apple odd in App Store on my phone
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How to change your Apple ID to a different email address:
Change your Apple ID - Apple Support
In a very few countries your Apple ID may be a phone number:
If so, scroll down in the article below to:
"Change your Apple ID to a different mobile phone number"
Use your mobile phone number as your Apple ID – Apple Support