Apple’s first foldable does not simply stretch iOS across a 7.6-inch screen. iOS 27 changes where controls live, how apps resize, how multitasking works, and what happens when iPhone Duo is partially folded or sitting on a desk.

That gives Duo a different software model from a conventional iPhone. The interface has to respond to two displays, changing screen shapes, the hinge, and multiple app windows while keeping controls usable as the phone opens, closes, rotates, and rests at different angles.

1. Controls move to the sides

Apple has moved Lock Screen controls, the Home Screen Dock, and app navigation to the sides of the display rather than…

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