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How do I deregister my old phone from iMessage without the phone?
iPhone 6s, iOS 13
I would go to Preferences in iMesage (in the menu bar), select iMessage at the top and you'll see:
"you can be reached for messages" and "start new conversations from" menu. You can deselect the phone number in both places.
The article linked above has a “Deregister iMessage online” section.
I don’t have access to iPhone to deregister my old number from iMessage
