Apple assures that not all units of the iPhone Duo are affected by the display issue.

Shikhar Mehrotra / Digital Trends

Merely days after the iPhone Duo hit the shelves, images of broken screens on the phone started popping up across social media. Until now, it’s been unclear what’s causing the line of defective pixels that appears vertically along the crease, as well as horizontally, on the phone’s inner display.

Apple has finally acknowledged the issue, which has shown up on iPhone Duo units owned by customers as well as demo units in stores. In a statement shared with Bloomberg , Apple says that not all iPhone Duo units are affected and that those that are tend to show the display fault early on. The company added that users who experience problems with their iPhone Duo display should contact AppleCare for a replacement.

Early adopters have reported seeing vertical and horizontal lines of defective pixels after hearing a cracking sound, followed by trouble opening and closing the phone at the hinge.…