How do I change my email address
How do I change my email and delete my old one
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Do you want to change your Apple ID email address on your current Apple ID so you retain access to your data and prior purchases? Note the restrictions in the article.
Make sure you turn of Find My Phone before signing out of the old ID. Once signed out and Find My Phone is off, then sign in with the new ID, then turn Find My Phone back on.
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.