I have changed phone numbers and unable to log in to my account
Im using a different phone and my last apple ID is connected to another number.
Apple not allowing me to log in, what do I do?
iPhone 11 Pro Max, iOS 14
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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.
If you can log into your Apple ID account, change the phone number. You need to change/add the number on your Apple ID. 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.