Apple id
My fathers Apple id is sending a code to his old phone that he no longer has, how do I change that so he can get his Apple id on his new phone ?
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See if anything here helps. If necessary, you can use account recovery as explained in the link at bottom of the article.
Verification code - how to get one and sign in with two-factor authentication. *
He needs to change/add the number on his Apple ID. Look in the Security section when signed in online. He may have to add the new number before he 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.