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The iPhone Duo has been out for a few days now, and while some customers may have to wait until 2027 , some early buyers are already saying that the inner display is cracking with no apparent reason. Among the worst cases, one user said the inner screen cracked within six hours of using this device, while another wasn't even able to finish setup before the screen cracked. According to them, they heard a crunching sound when unfolding the iPhone Duo, and then this large crack would appear in the center of the crease, while others reported the right side of the display also breaking. It's unclear what's been causing this defect, and repair company iFixit suggests that this could be due to localized mechanical stress caused by overlapping internal support edges near the central hinge.

The company overlaid 3D models and CT scans onto images of cracked devices to understand what could have happened.…