The $2000 iPhone Duo uses fingerprint unlocking, the first new iPhone with Touch ID since the budget SE in 2022. Most iPhone owners have used Face ID since iPhone X.

Duo is designed for use in different positions, so Face ID sensors would have to sit behind both the inner and outer displays. The screen is very thin, and Apple wanted both displays to work the same way.

That may change in the second generation. Bloomberg’s Mark Gurman says Apple is actively working on under-screen Face ID, with iPhone Duo 2 prototypes already hiding it in the outer display. The second Duo may also get the Action button from iPhone 15 Pro.