Reports that Apple’s iPhone Duo is facing production problems have highlighted how hard it is to move a foldable from prototype to mass production. A September 21 report said whole-device assembly yield for the iPhone Duo was just over 60%, citing a source close to Foxconn’s supply chain, and separate supply-chain reporting described difficulties producing hinges and the backplate that supports the folding panel. These reports remain unconfirmed, and the assembly figure is not a prediction of how many customers will receive faulty phones.
iPhone Duo reports and unanswered questions
The accounts raise a core manufacturing question: what separates an ambitious foldable design from a device that can be produced consistently at scale? A sophisticated hinge or a large folding display only matters if those parts fit and work reliably with the surrounding structure during high-volume assembly.
Samsung’s foldable evolution and manufacturing practices
Samsung’s foldable history provides a clear example of iterative refinement. The company began selling the Galaxy Fold in 2019 and across subsequent generations—its Fold and Flip families—it modified hinge designs and display structures while experimenting with different folding approaches. Samsung’s own description of that evolution traces the Fold 2’s Hideaway Hinge through a move away from gears by the Fold 4 and the Fold 5’s Flex Hinge, which allowed the phone to close without a gap. Each hinge change had to be integrated into a finished device so the hinge, screen and body fit together correctly.
Those design changes produced tangible consumer benefits: a gap-free closure made folded devices thinner and easier to carry, while successive generations offered opportunities to improve how the mechanism fits into the phone without sacrificing the larger folding screen that drives demand.
Extending lessons with the Galaxy Z TriFold
Samsung then applied that experience to a more complex form factor with the Galaxy Z TriFold, which added a second hinge and increased the interplay between hinges, display and body. Samsung’s manufacturing footage shows the two differently sized hinges being assembled with automated systems, 3D laser scanning used to check the display surface, and CT scans to inspect the flexible circuit board before it is attached to the display. Samsung also subjected the main display to 200,000 folding cycles during durability testing to assess long-term reliability. These checks are intended to identify manufacturing problems before full assembly.
Refinements carried into the Galaxy Z Fold 8
For the Galaxy Z Fold 8, Samsung described further refinements to parts and the manufacturing process. Samsung says it eliminated roughly 15 types of auxiliary parts and combined others to save weight and space, and it refined how it makes the thinner metal supports beneath the display so they stay flat and fit precisely during production. Those less visible changes contribute to making the Fold 8 slimmer while maintaining the structure that supports the screen.
Samsung does not publish a comparable assembly-yield figure, so there is no numerical claim of a production advantage to cite. What is visible in Samsung’s trajectory is a succession of practical manufacturing changes—from hinge design to part simplification and inspection methods—that aim to improve consistency.
For Apple, the immediate challenge is producing its first foldable in large numbers while keeping quality consistent. Samsung’s experience, built over several generations and extended to more complex foldables, illustrates the kinds of manufacturing refinements companies confront when turning foldable concepts into everyday products.
