Apple’s abandoned iPhone multitasking interface has returned after more than 15 years, thanks to artificial intelligence and modern emulation technology.
Developer Steve Troughton-Smith recently demonstrated an experimental iOS 4 interface that Apple never released publicly. The discovery offers a fascinating look at how the company once imagined switching between applications.
Moreover, the demonstration highlights how AI can help preserve forgotten software and uncover important moments in technology history.
Apple’s Forgotten Multitasking Design
During the early development of iOS 4, Apple explored different ways to manage multiple applications.
At the time, iPhone users accessed multitasking through a sliding panel at the bottom of the screen. However, Apple also tested a more visual approach.
The experimental interface displayed running applications as individual cards arranged across the screen.
Additionally, users could double-tap the Home button to view their applications and switch between them without scrolling through a traditional list.
Although Apple eventually abandoned the concept, evidence of its development emerged in 2011 through an unusual iPhone 4 prototype.
AI Helps Restore Rare iOS Software
Troughton-Smith shared footage of the forgotten interface on Mastodon in November 2026.
The demonstration featured an unreleased iOS 4 build running through a modified version of the QEMU emulator.
Notably, the software carried build number 8A218, slightly newer than the previously discovered 8A216 version.
However, restoring the experimental operating system required more than conventional emulation techniques.
AI-assisted development helped overcome technical challenges and enabled the rare software to run again.
According to the report, the recovered system likely originated from a prototype device rather than a standard Apple software package.
A Glimpse Into Apple’s Design Evolution
The restored interface reveals an early version of a design approach that later appeared on Apple’s tablets.
For example, older iPadOS versions displayed open applications as swipeable cards before Apple introduced more advanced window management.
Nevertheless, the original iOS 4 concept differed in several details, including the placement of application names.
The discovery also demonstrates the growing importance of artificial intelligence in software preservation.
Instead of relying entirely on aging hardware, developers can now use AI-assisted tools to revive experimental operating systems.
Ultimately, Apple’s forgotten multitasking interface provides a rare glimpse into an alternative direction for the iPhone.
It also shows how modern technology can uncover innovative ideas that never reached consumers.
