Apple’s iPhone Duo is tested for durability using an unofficial, custom-built apparatus that repeatedly folds a review unit automatically. Across four nights, Joanna Stern subjects the device to more than 32,000 folds to assess how the hinge changes with use.
MacRumors reports that Stern does not rely on Apple-published durability figures, noting Apple has not shared a lifetime fold number. The testing includes measurements with a calibrated push-pull gauge before and after the fold run, and the results indicate the hinge is stiffer at the end, even though Stern says she could not feel any noticeable loosening in everyday terms.
Other outlets focus on related findings and the hinge/display balance. Android Authority highlights that while the titanium hinge holds up, the inner display crease may show a different story, without attributing specific results beyond that premise. Cult of Mac similarly emphasizes Stern’s custom tool and measurement approach after 32,000 folds, framing the outcome as a surprise based on what the test shows.
