Signing into your Apple account on a new iPhone
I’m trying to sign into my Apple account on my iPhone but it’s saying I need a verification from a old phone number I don’t have anymore, what do I do?
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You need a verification code? 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.
You need to change/add the number on your Apple ID. 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.