iPhone Duo hinge defect leaves lines on inner display for some buyers

Buyers of Apple's first foldable, the iPhone Duo, are reporting inner display damage linked to a potential hinge defect, with vertical and horizontal lines appearing on the screen. Apple is offering replacements, but limited stock is hindering availability. Users describe the hinge becoming stiff before a popping sound occurs, followed by permanent lines on the display. The issue has appeared within hours or days of use, with affected customers denying any unusual handling. Many have contacted Apple or carriers for solutions. The problem likely stems from the hinge and may affect a select batch of devices, as most users and reviewers report no issues. Affected customers are advised to contact Apple support promptly to secure a replacement.