Apple's first foldable iPhone is not just a smaller tablet: its 5.4-inch outer screen, 7.6-inch inner display, Split View, dual-window support, and folding camera modes create a new iPhone workflow.
Two displays, one continuous iPhone experience
iPhone Duo uses a 5.4-inch outer display and opens to a 7.6-inch inner display. Apple says both displays use the same aspect ratio so content can scale proportionally as the device changes state.
Split View finally reaches iPhone
On the inner display, iOS 27 can place two apps side by side. Users can swap either side, save app pairs, or even open two windows of the same app, giving the foldable model a multitasking role that conventional iPhones have not offered.
The hinge changes camera and StandBy use cases
The device can stand in partially folded positions, creating new ways to frame photos and video without holding the phone. StandBy can also operate on the inner or outer display even when the phone is not charging.
A20 Pro has to drive more than a bigger screen
The foldable uses A20 Pro, a vapor chamber, a dual-battery architecture, and a display engine built to drive both screens. Apple quotes up to 31 hours of video playback on the inner display and 44 hours on the outer display.
Questions people are asking after the Apple event
How large is the iPhone Duo when it is unfolded?
Apple says the inner display measures 7.6 inches, while the outer display measures 5.4 inches.
Can iPhone Duo run two apps at the same time?
Yes. iOS 27 introduces Split View on iPhone Duo for two side-by-side apps.
When does iPhone Duo go on sale?
Apple says pre-orders begin October 16, 2026, with availability beginning October 23.