Add or remove your phone number in Messages or FaceTime
https://support.apple.com/en-us/HT201349
Nov 03, 2021 . For Messages, choose Messages > Preferences, then click iMessage. For FaceTime, choose FaceTime > Preferences, then click Settings. Turn your phone number on or off: To turn on your phone number, select it and your Apple ID in the list. If you don't see your phone number, get help with your settings or contact Apple Support.
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