Apple IDs can use mobile numbers for iMessages and Facetime and/or your Apple ID email address
Set up your phone number
-
Go to Settings > Messages and make sure iMessage is turned on. You may need to wait a moment for it to be activated.
-
Tap Send & Receive. If you see Use your Apple ID for iMessage, tap it and sign in with your Apple ID.
-
In the You can receive iMessages to and Reply From section, make sure your phone number and Apple ID are selected.
-
Go to Settings > FaceTime and make sure your phone number and Apple ID are selected in the You can be reached by FaceTime at section.
Remove your phone number
If you don't want calls or messages for your iPhone, you can remove your phone number. There are two ways to do this:
-
On your iPhone, go to Settings > Messages > Send & Receive. Select your Apple ID email address then unselect your phone number.
-
Go to Settings > FaceTime, select your Apple ID then unselect your phone number.
See:
Apple Support: Add or remove your phone number in Messages or FaceTime >