YouTuber pins iPhone Duo screen cracks on thin hinge link
CuriousHagi reproduced the crack in durability testing, then disassembled the foldable and found a broken middle linking hinge.
YouTuber CuriousHagi reproduced a cracked iPhone Duo screen during durability testing, then disassembled the phone to find the cause, according to a report by The Verge. The teardown points to a thin, notched hinge link as the likely failure point.
Inside the hinge, CuriousHagi found a gear-like central hinge working alongside two types of linking hinges. One link in the middle set — thinner than the links above and below it — had snapped at a small notch.
The teardown also turned up marks where the hinge met the support plate, which the video presents as a possible snag point in the mechanism.
Cracks reported in the same spot
In October 2025, the iPhone Duo subreddit and social media filled with reports of the foldable failing within hours of use, with hinges catching and screens cracking in the same place.
CuriousHagi's findings offer a physical explanation for those accounts, though Apple has not commented on the cause of the cracks.
Quick answers
What did CuriousHagi find inside the iPhone Duo hinge?
A gear-like central hinge and two types of linking hinges. One middle link, thinner than the links above and below, had snapped at a small notch.
Did CuriousHagi reproduce the iPhone Duo screen crack?
Yes. The YouTuber reproduced a cracked screen during durability testing before disassembling the phone.