--- title: "Foldable iPhone Duo Hinge Shows Wear: Loop Fails to Open Automatically After 440k Cycles in CNET Test" description: "The foldable iPhone Duo in CNET's Fold-a-Phone test surpassed 440,000 cycles: the hinge started losing rigidity and failed to open fully on its own, though no hinge failure was recorded." date: 2026-11-14T14:52:24.070Z lang: en url: https://xab.info/en/posts/iphone-duo-hinge-wear-440k-cycles-cnelt-test tags: [apple, iphone-duo, foldable-phone, hinge, cnet, durability-test] author: "Alexander Buran" publisher: "XAB.info" --- # Foldable iPhone Duo Hinge Shows Wear: Loop Fails to Open Automatically After 440k Cycles in CNET Test ![Foldable smartphone during an automated hinge durability test showing a cycle counter](https://xab.info/media/2026/11/14/iphone-duo-sharnir-sdal-posle-440-tysyach-skladyvanii/iphone-duo-sharnir-sdal-posle-440-tysyach-skladyvanii-1.webp) ## Key Points - In CNET's Fold-a-Phone test, the foldable iPhone Duo went through about 440,300 folding cycles. - The first signs of hinge wear appeared around 390,000 cycles: the mechanism became less smooth, and the characteristic unfolding sound disappeared. - Between 440,000 and 440,300 cycles, the hinge stopped opening fully by itself, leaving the screen at a 5–10 degree angle; manually pushing the screen down resolves it. - No hinge failure, display cracks, or crease worsening were recorded. - According to CNET, this is equivalent to about 12.5 years of use at 100 folds per day; Apple has not disclosed the official lifespan of the mechanism. Apple's foldable iPhone Duo, which has been undergoing continuous automated folding tests on a Fold-a-Phone machine for several weeks, has begun showing the first signs of wear in its folding mechanism. According to CNET, by the time the issues were recorded, the device had gone through approximately 440,300 folding and unfolding cycles. The hinge stopped opening completely on its own: after the testing machine stopped pulling the screen, the smartphone remained slightly compressed, failing to reach a fully flat position. ### First Signs of Hinge Fatigue The first deviations from standard mechanism behavior were noticeable even earlier—around the 390,000 cycle mark. According to CNET's observations, the hinge began operating less smoothly, and the characteristic sound accompanying screen unfolding effectively disappeared. At this stage, the smartphone still straightened out almost entirely by inertia right after the machine stopped applying force, so the wear did not look critical and did not stop the test. ### What Is Happening to the Hinge Now Noticeable deterioration was recorded between 440,000 and 440,300 cycles: the folding mechanism began to "stall," leaving the screen at an angle of about 5–10 degrees from a flat position. At the same time, the smartphone can still be fully opened manually by pressing the screen all the way down. Importantly, no actual hinge failure has been recorded at this point: the display works, other unfolding positions are locked without problems, and no visible cracks, screen damage, or noticeable deepening of the crease on the panel have been detected. ### How This Translates to Real-World Years The tests are conducted on a special Fold-a-Phone machine that automatically and continuously folds and unfolds the device. According to CNET's estimate, by the time the first problems appeared, the iPhone Duo had undergone stress equivalent to approximately 12.5 years of daily use at a rate of 100 folds per day. Apple has not officially disclosed the stated lifespan of the iPhone Duo folding mechanism, so the manufacturer has not confirmed an exact "limit" figure for cycles. In the published frame of the test setup, the cycle counter already exceeds 450,000, indicating that the test is still ongoing. ### What This Means for Foldable Smartphone Owners The results of the CNET test should be taken as data on the fatigue of a specific unit under accelerated laboratory conditions, rather than as a guaranteed lifespan for every iPhone Duo. Nevertheless, the observation shows that a foldable smartphone's hinge is a component that loses rigidity and locking precision over time, even in the absence of visible damage. For buyers of foldable devices, this is an additional argument to monitor the condition of the hinge and not force the mechanism, and for the industry, it is another public durability benchmark that manufacturers do not yet back up with official specifications. ## Fact-Check & Sources - [Это и есть настоящий предел? Шарнир складного iPhone Duo начал сдавать после 440 тысяч складываний](https://www.ixbt.com/news/2026/11/14/eto-i-est-nastoiashhii-predel-sarnir-skladnogo-iphone-duo-nacal-sdavat-posle-440-tysiac-skladyvanii.html) - Primary source (CNET report): ~440,300 cycles, first signs at ~390k, stalling at 5–10° in the 440,000–440,300 range, manual push works, no failure, equivalent to ~12.5 years at 100 folds/day, Apple did not disclose lifespan. Caveat: the 'limit' and conversion to years are CNET estimates, not official Apple specifications. ## FAQ ### Did the iPhone Duo hinge break in the CNET test? No, an actual hinge failure was not recorded. The screen works, other opening positions are fixed, and there are no visible cracks or display damage. The hinge merely stopped opening completely on its own, leaving the screen at a 5–10 degree angle, but the smartphone can be pushed flat manually. ### How many cycles did the device go through, and when did the first problems appear? About 440,300 cycles by the time noticeable deterioration was recorded. The first signs of wear—reduced smoothness and the disappearance of the opening sound—appeared around 390,000 cycles. ### How much is this in terms of real-world years of use? According to CNET, it is equivalent to about 12.5 years at 100 folds per day. Apple has not officially disclosed the stated lifespan of the iPhone Duo folding mechanism.