If you have multiple numbers and email addresses associated with FaceTime, you can set which one will appear as your caller ID, that is, from where you will initiate a call by default. The configuration of your caller ID will allow the person who receives that call to always see the same contact and know that it is you.
To configure or set your caller ID, first open the "Settings" app on your iPhone and select "FaceTime".
On the next screen you can select or deselect all the numbers and email addresses that others can contact you by FaceTime and if you go down, you will see the "Caller ID" section. Click on the one you want and that's it. As you can see in the image, I have selected my phone number.
Remember that in our section Tutorials you have at your disposal a huge variety of tips and tricks for all your Apple devices, equipment and services.
SOURCE | iPhoneLife