iFixit explains why the iPhone Duo's hinge may crack the screen

An iFixit teardown found that the iPhone Duo's flexible inner display presses against a hinge component, causing cracks and black spots in the center of the screen. Apple acknowledged an "issue" affecting a "small number" of units and is replacing damaged phones without disclosing how many failed.

• Damage clusters in the center of the screen above the hinge
• Cause is contact between the display and a metal hinge support
• Apple replaces faulty units but has not issued a recall
• iFixit says a recall is possible if failures persist in three months