I have had an older iPad with no cellular but recently I got an iPhone as well. I would prefer people not seeing my phone number.
If I message them from my iPad will they now be able to see my iPhone number since both use the same Apple ID account?
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For Messages, go to Settings > Messages and make sure that iMessage is on. If asked, sign in with the Apple ID you're using with Messages and FaceTime on your iPhone. Then tap Send & Receive.
For FaceTime, go to Settings > FaceTime. If asked, sign in with the Apple ID that you're using with Messages and FaceTime on your iPhone.
Turn your phone number on or off:
To turn on your phone number, select it and your Apple ID in the “You can be reached” section. If you don't see your phone number, get help with your settings or contact Apple Support. If you see a number that isn't yours, change your Apple ID password.
To turn off your phone number, uncheck it.
Once you turn off your phone number at the "You can be reached" section people will see your email.