If you accidentally deregister the wrong phone number how would you be able to bring it back to iMessage
deregister from iMessage
iPhone 13 Pro, iOS 15
deregister from iMessage
iPhone 13 Pro, iOS 15
See the Apple Support article(s) below. Link to contact Apple Support at the end of the article.
If you accidentally deregister the wrong phone number how would you be able to bring it back to iMessage