By using your Apple ID for FaceTime, you will be able to receive contact via FaceTime from people who know the phone number and email address associated with your Apple ID.
How do I use my Apple ID for FaceTime?
Here’s how to use your Apple ID for FaceTime on your iPhone: You can use an Apple ID different from the Apple ID displayed when you tap [Use another Apple ID]. After a while… The [phone number] and [email address] associated with your Apple ID will be displayed.
