Apple has embedded references to foldable hardware within the first iOS 27 developer beta, signaling the company’s preparation for a folding iPhone. Code discovered this week includes strings for display states and hinge angles, alongside new software frameworks designed to support resizable app interfaces across varying device form factors.
Hidden Strings in iOS 27 Reveal Foldable Hardware
The release of the first iOS 27 developer beta has provided the most concrete evidence to date that Apple is readying a foldable device, widely expected to be marketed as the iPhone Ultra. Developers and observers, including X user Sam Henri Gold, identified specific framework strings that serve no function on current slab-style iPhones.
Photo: Android Authority
According to 9to5Mac, these references include “foldState” and “angleDegrees,” which were entirely absent from iOS 26. These findings were corroborated by Android Authority, which noted that the code also includes “mechanicalAngleDegrees” and “isanglevalid.” Such identifiers suggest that the software is being built to track the precise physical position of a device’s hinge, enabling the system to distinguish between a fully closed, partially open, or fully unfolded state.
Photo: CNET
Further deepening the technical evidence, MacRumors reported that the OS contains a new key capable of returning the total count of built-in displays on a device. This functionality implies the software stack is being prepared to manage more than one integrated screen, a hallmark of book-style foldable phones.
In the broader context of mobile operating systems, the transition to multi-screen support is a complex engineering milestone. Unlike traditional smartphone OS development, which assumes a single, static display geometry, foldable software requires a “fluid” interface that can reflow content dynamically without crashing or losing state. This is a challenge Apple has faced previously with the evolution of iPadOS, which gradually introduced multitasking features like Split View and Slide Over to accommodate larger, more versatile screens.
Software Adaptability and the Push for Resizable Apps
Beyond the hardware-specific strings, Apple has signaled a major shift in how developers should approach application design. During the recent Platforms State of the Union, the company urged developers to move away from fixed device orientations. Instead, Apple is pushing for what it describes as
“a dynamic range of sizes and aspect ratios.”
Apple, via MacRumors
This mandate is paired with new tools in Xcode, including a resizable iOS simulator, which allows developers to test how their layouts reflow across multiple screen sizes. Apple explicitly noted that apps utilizing standard framework support for basic resizability are already
“well on your way to supporting full resizability.”
Apple’s New Siri in iOS 27 Is WAY Bigger Than We Thought
Apple, via MacRumors
For developers, this shift in guidance is a requirement that makes practical sense only if a future iPhone is capable of unfolding into a larger, tablet-like canvas. As CNET highlighted, Apple’s current multitasking limitations are a point of frustration for users of large-screen devices. An “iPad-like interface when opened” would be a significant departure from the current iOS experience, potentially allowing users to run multiple apps simultaneously—a feature common among Android foldable competitors but currently missing from the iPhone lineup.
Historically, Apple has maintained a strict separation between the iPhone’s interface and the iPad’s more robust multitasking capabilities. By forcing developers to adopt universal, adaptive layouts, the company is effectively lowering the barrier for entry for a high-end, large-screen foldable device. This strategy reflects Apple’s historical approach to hardware transitions: ensuring the software ecosystem is ready to support new hardware months, or even years, before the physical product reaches the consumer.
Expected Specifications and Market Entry
While Apple has not officially confirmed the device, industry expectations point to a high-end entry in the smartphone market. The anticipated iPhone Ultra is rumored to feature a book-style design with a roughly 7.8-inch internal display and a 5.5-inch cover screen.
Photo: MacRumors
Technical specifications reportedly include:
A titanium frame and Liquid Metal hinge
The A20 chip and C2 modem
Dual rear cameras
Touch ID integration, departing from the Face ID standard
The device is expected to debut in September 2026 alongside the iPhone 18 Pro and iPhone 18 Pro Max. With a projected starting price of over $2,000, it would represent the most expensive iteration of the iPhone to date. The inclusion of software hooks for
“app adaptibility”
Apple, via Android Authority
suggests that Apple is not merely releasing a hardware novelty, but is attempting to establish a robust software ecosystem that can sustain the transition from a standard handheld phone to an expanded, multi-screen device. Whether this will include “Flex Mode” functionality—allowing the device to function like a mini-laptop—remains to be seen, though the presence of hinge-angle sensors in the iOS 27 code provides a strong technical foundation for such a feature.
The stakes for this release are significant. By entering the foldable market, Apple will be competing directly with established designs from manufacturers like Samsung and Google. The primary challenge for Apple will be maintaining its reputation for seamless hardware-software integration while navigating the inherent durability and crease-related limitations that have historically plagued foldable devices. If the iOS 27 beta is any indication, the company is prioritizing software stability and interface adaptability as the primary pillars of its strategy to differentiate the iPhone Ultra from existing, first-generation foldable alternatives already on the market.
Sophie is a tech innovator and acclaimed tech writer recognized by the Online News Association. She translates the fast-paced world of technology, AI, and digital trends into compelling stories for readers of all backgrounds.
