A verification code can be displayed on the screen of a trusted device or sent to a trusted phone number via SMS or a phone call. Two factor authentication for your Apple ID acts as a critical security layer beyond just a password.
iPhone Two Way Authentication Setup Guide
These can include checking your network connection, ensuring your device software is up to date, or reviewing your account's security settings. A trusted device is any device where you have successfully signed in using two factor authentication and confirmed the trust.
Because this setting is so fundamental to account security, Apple often migrates users from the older two step verification method automatically. The steps guide you through verifying your current phone number and confirming your trusted devices.
iPhone Two Way Authentication Setup Guide
You must also have at least one trusted phone number associated with your account, which is used to display the sign-in alert if your trusted devices are unavailable. This backup method ensures you retain access to your account even if your primary devices are lost or stolen.
More About Iphone two way authentication
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