iPhone Duo hinge retains stiffness after 32,640 folds
Journalist Joanna Stern used a custom-built machine to fold Apple’s iPhone Duo 32,640 times over four nights. A calibrated gauge found the hinge was slightly stiffer afterwards, though Stern said she could feel no difference in everyday use. Apple has not published its own hinge or display durability results.
Bottom line — Stern’s test found no noticeable hinge deterioration, but it did not establish how the iPhone Duo’s screen crease changes over time.
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MacRumors reports that the test was done with a case on and the machine did not close the phone fully each time.
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Stern did not report whether the test made the display crease more visible, MacRumors and MacTrast note.
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MacTrast says Stern’s 32,640 folds equate to almost a year of use using Samsung Display’s estimate of about 100 folds a day.
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Samsung Display said its Galaxy Z Fold7 display passed a 500,000-fold test in 2025, according to MacRumors.