According to Mark Gurman of Bloomberg, Apple is developing a foldable device that mimics the functionality of a large iPad, capable of unfolding to create a screen size nearly equivalent to two iPad Pros positioned side by side. This innovative foldable device is expected to have a display of approximately 20 inches and is slated for a 2028 launch. It is likely to run on iPadOS or a tailored version of it. Furthermore, Gurman noted that while a foldable iPhone is also in the pipeline, it is unlikely to debut before 2026.
Illustrations from Apple's patent concerning hinge designs for foldable display devices
DIY foldable iPhone concept from 2022 (Tech Aesthetics)
Previous reports have suggested that Apple is also exploring a flip-style foldable iPhone, similar in design to Samsung's Galaxy Z Flip series. For further information, readers can refer to the original source.