Apple ID change
I need to change my apple ID from my IphoneX
iPhone XS
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Do you need to do a name change for your Apple ID or sign out of your ID on the iPhone?
Note the restrictions in the article.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.
To sign out, use the 2nd link as a guide of where to sign out.