You should be using the same Apple ID on all of your devices.
If you see a number that isn’t yours, change your Apple ID password If you don't see your phone number, get help with your settings or contact Apple Support.
Turn your phone number on or off for your MacĪfter you set up your phone number, you can turn it on or off for Messages and FaceTime on your Mac.
If you have questions, contact Apple Support. Calls or messages for the removed numbers won't appear on those devices anymore. This removes all phone numbers from your iPad, iPod touch, and Mac.
Instead of using the same Apple ID as someone else, set up Family Sharing. If you use this feature and share your Apple ID with someone, you can't prevent them from seeing your conversations. Turn on your phone number for your iPad or iPod touch.On your other devices, you can now turn on the phone number that you just set up: Go to Settings > FaceTime and follow the same steps.In the “You can be reached” section, make sure that there are checkmarks beside your phone number and Apple ID.If you see “Use your Apple ID for iMessage,” tap it and sign in with the same Apple ID that you use on your Mac, iPad, and iPod touch. You might need to wait a moment for it to activate. Go to Settings > Messages and make sure that iMessage is on.These steps work only with the phone number that belongs to your iPhone, not the phone number of a landline or other device.