How do I change my trusted number on my I phone to new phone number so I can change passcode
How do I change my cell number to my new number to help change my passcode
iPhone 12, iOS 16
Question marked as
See “If you still can’t sign in” here.
Get a verification code and sign in with two-factor authentication - Apple Support
Presumably you are being asked to use your trusted device to help you sign in. Naturally, by that point, it’s too late to change your trusted telephone number. If it were possible to change at that point, having a trusted number would be absolutely useless as anyone could change the number when a new number is needed.