How to change a trusted number
How to change a trusted cellphone number
iPhone 6s, iOS 14
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Look in the Security section when signed in online. You need to change/add the number on your Apple ID. 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.