Apple account
I got recently changed phones as my old is broken and can’t sign into my Apple account as I don’t have the number associated with the account anymore..
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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.
You need to change 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.