Start Using Security Keys

Your iPhone also lets you set up physical security keys that work as a two-factor authentication method.

While there are contactless security keys that work over NFC and others that can be used with older iPhones with a Lightning Port, both of these tend to be more expensive than USB-only keys. Now any FIDO2-compliant security key you buy should work find with your iPhone 15, iPad, or Mac right off the bat.