How do I use my email address as my Apple ID?
How do I use my email address as my apple id on my new iPhone? This email address I once used it as apple ID in 2018 on my iPad.
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If you want to change your ID, have you followed the steps in this 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. *.