Apple id
Why is my Apple ID using my old phone number and not my updated one?
iPhone 12 Pro Max, iOS 15
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You need to change/add the number on your Apple ID. Look in the Security section when signed in online. You may have to add the new number before you can remove the old number. After the change, allow up to 24 hours for the change to sync. Before trying to make the change, sign out of Messages/FaceTime on all devices/computers.