Deregister iMessage on a phone I no longer have acccess to
How do I deregister iMessage on a phone I no linger have access to!?
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See the Apple Support article(s) below. Link to contact Apple Support at the end of the article.
Messages or FaceTime - Add or remove your phone number. *
Try changing the Apple ID password.
What to do after you change your Apple ID or password - Apple Support - I suggest doing this before you change your Apple ID or password.