iMessages
Why does not phone say activation unsuccessful when I try to use iMessage with my phone number and not just my email?
iPhone 11
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Best reply
Messages is working with your email address, but not your phone?
Have you added the phone number?
Messages or FaceTime - Add or remove your phone number
Have you changed/added 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.