How do I use another device to approve an iPhone ?
Hello,
How do I use another Apple device to approve an iPhone to an iCloud account?
Thank you.
iPhone 8, iOS 13
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Change Trusted Device list for your Apple ID on Mac - Apple Support
You need another trusted device or telephone number.
See Two-factor authentication for Apple ID - Apple Support:
A trusted device is an iPhone, iPad, or iPod touch with iOS 9 and later, or a Mac with OS X El Capitan and later that you've already signed in to using two-factor authentication.