Apple ID used with wrong phone no., how to fix
Apple ID inadvertently used with wrong
phone no. On new iPhone set up how do you fix this
iPad Air, iOS 12
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You need to change/add the number on your Apple ID. Look in the Security section when signed in online. You may have to add the new number before you can remove the old number. After the change, allow up to 24 hours for the change to sync. Before trying to make the change, sign out of Messages/FaceTime on all devices/computers.