Here’s why the iPhone Duo’s hinge could be cracking the screen

Reports of broken inner screens emerged within hours of the iPhone Duo’s launch, with damage appearing near the hinge. Apple says a small number of devices are affected and is replacing damaged units; teardown technician Shahram Mokhtari suggests the hinge may be pressing against the delicate display, though the cause has not been confirmed.

The hinge combines gears, springs and joints, and its central support bar may fail to lower enough as the phone folds, creating a stress point. Some users have reported feeling resistance or hearing a crack, while a durability-test video showed a broken hinge component. Apple has not disclosed how many phones are affected or issued a recall; Mokhtari says repeated failures over the coming months could indicate a wider problem.