Apple is testing a new one-handed usability feature for iPhone Duo in the iOS 27.3 developer beta, adding “Reachability” that shifts the display horizontally to make it easier to access content with one hand. This update addresses complaints about the wide outer screen’s usability since Duo models launched.
The new Reachability setting appears under Settings → Accessibility → Reachability. Once active, a short swipe from either side of the screen moves the interface left or right. It’s a departure from the vertical shift used by other iPhones; for Duo, it’s designed specifically to handle its broader, dual-screen layout.
iPhone Duo’s outer display, introduced in the recent device release, is wider than standard iPhones. Users found it hard to reach buttons and content at the far edge one-handed. Apple acknowledged the issue early on, promising a software update to improve accessibility.
Alongside this, iOS 27.3 beta 1 also includes various other improvements and fixes. While the developer beta is already available, a public beta is expected in the near future. The full release to all users is slated for next month, with mid-December being the most likely window for general availability.
This horizontal Reachability won’t be optional by default—it must be turned on through Accessibility settings. For those who often use iPhone Duo with one hand, this feature could make a significant difference in comfort and usability.
What this means is that Apple continues refining the Duo experience post-launch, focusing on real-world usability. The display layout that once drew criticism now has a device-specific solution. Going forward, it’ll be worth watching how this horizontal Reachability is received, whether Apple tweaks it further before public launch, and whether similar features will migrate to its other wide-screen or foldable devices.
