Apple iPhone Duo · Design

The hinge is expected to be the hardest part, not the screen

Reports put the development risk on the hinge and the visible crease rather than on the displays themselves. The reported 4.7mm unfolded thickness is what makes that hard.

2 min readUpdated Sep 21, 2026

Apple iPhone Duo Guide
Apple iPhone Duo
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Apple iPhone Duo

Available nowReleased Oct 2026

Our estimate

What this is made of

What this is made of

  • The inner screen will sit between two layers of ultra-thin glass

    The Elec reports that the book-style iPhone Ultra sandwiches its inner display between two layers of ultra-thin glass, keeping the panel out of direct contact with the hinge. The stated purpose is to spread the mechanical stress of folding across more than one layer, improving durability and reducing how much the crease shows over time. The Elec credits the method to Apple and reports that Google, Oppo and Vivo intend to adopt it in their own foldables next year, with Samsung mass producing the glass for them ahead of wide use in 2027.

    Right

  • A leaker measured the crease at under 0.15mm out of the box

    The Weibo account Fixed Focus Digital measured a crease of less than 0.15mm at an angle of less than 2.5 degrees, which is a reduction rather than the erasure Apple was said to be chasing. The figure is out of the box, and nobody has run the thousands of opening and closing cycles that would show whether it holds.

  • The phone is expected to open into a 7.6-inch screen from a 5.4-inch outer one

    Right. Apple lists a 5.4-inch outer display and a 7.6-inch inner folding display. Danbo, Kim Young-ho and Sonny Dickson had reported about 5.4 to 5.5 inches outside and 7.6 to 7.8 inches inside.

    Right

  • Apple is targeting a nearly invisible crease

    Instant Digital reported hinge reliability problems, while Jon Prosser and other reports said Apple was targeting a nearly invisible crease with a new hinge mechanism.

  • The phone could be about 4.7mm thick unfolded

    A Macworld source reported a 4.7mm unfolded thickness, while Danbo measured mock-up halves at 5.6mm and 5.3mm.

    Wrong

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