Hi there, David8406!
Thanks for reaching out to the Apple Support Communities! It sounds like you are having an issue with using your phone number with Messages and FaceTime on your new device and I am happy to help! Check out this article with steps for how to Add or remove your phone number in Messages or FaceTime. Specifically, I recommend you check out this section:

1. How To Register Phone Number With Imessage On Mac
2. How To Use Phone Number For Imessage On Mac

Blocking Someone on iMessage Using iPhone and iPad. You will find that there are a couple of ways to accomplish blocking a number or contact from iMessage using your device. Block From Phone App. Go into your recent tab and tap beside the phone number that you want to block. Step 4: Choose the email address and phone number that you prefer to use when messaging others. After completing the steps above, you have successfully set up iMessage on your Mac. Then you can send unlimited messages to any Mac, iPhone, or iPad right from your Mac. And now we will go in details on how to get iMessage on PC.

If you can't see or select your number in Messages or FaceTime

How To Register Phone Number With Imessage On Mac

1. Make sure that you're using the latest software for your Mac or iOS device.
2. Make sure that you correctly followed the iPhone steps to set up your phone number. You should be using the same Apple ID on all of your devices.
3. In the “You can be reached” section of Messages and FaceTime settings, make sure that there are checkmarks beside your phone number and Apple ID:
   

How To Use Phone Number For Imessage On Mac

If your phone number is unchecked and you can't select it, or you have some other issue, follow these steps:

1. On your Mac:
   • In Messages, choose Messages > Preferences, then click Accounts and select your iMessage account. Click Sign Out.
   • In FaceTime, choose FaceTime > Preferences, then click Sign Out.
2. On your iPhone, iPad, and iPod:
   • Go to Settings > Messages > Send & Receive. Tap your Apple ID, then tap Sign Out.
   • Go to Settings > FaceTime. Tap your Apple ID, then tap Sign Out.
3. On your iPhone:
   • Go back to Settings > Messages and make sure that iMessage is turned on.
   • Tap Send & Receive, then choose “Use your Apple ID for iMessage” and sign in with your Apple ID.
4. Using the same Apple ID, sign back in to Messages and FaceTime on your other devices.

If you still need help, change your Apple ID password and repeat the setup steps. If that doesn't work, contact Apple Support.

Take care!

Jul 4, 2018 6:46 AM