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Coverage· Apple· Published Sep 10, 2026

iPhone Duo uses Touch ID, with Apple Watch authentication as an alternative

Apple’s first foldable device, the iPhone Duo, uses Touch ID because Face ID could not work in both its open and closed configurations. Apple Watch can automatically authenticate users who prefer not to use Touch ID.

Coverage

DNA Brief

Signal Summary

Touch ID can authenticate the iPhone Duo whether it is open or closed and whether it is facing forward or backward. The report does not identify which Apple Watch models support the described authentication or explain how it is set up.

Why It Matters

Face ID’s inability to cover both configurations makes Touch ID the iPhone Duo’s primary biometric option, while Apple Watch provides a hands-off alternative for users who do not want to use Touch ID directly.

Evidence

Start with the primary evidence, then review supporting sources and context.

1 items

Primary Evidence

1
  • AppleInsiderDocumentOriginal

    iPhone Duo users can be authenticated with Apple Watch if Touch ID isn't ideal

    Wesley Hilliard <wes@appleinsider.com>

    “Face ID wasn't going to work on iPhone Duo, so Apple chose Touch ID instead. For those that don't like Touch ID, Apple Watch will authenticate them automatically. Apple chose a Touch ID sensor for iPhone Duo since Face ID would have proven difficult The iPhone Duo is Apple's first foldable device , which means it can be used opened or closed.…”
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