An unspecified number of iPhone Duo owners have complained that the inner display has already cracked along the hinge, according to reports by ArsTechnica and others. This is fairly troubling, given that the device has only been out three days.

"The response to iPhone Duo from early users has been incredibly positive, and we are seeing exciting things from developers who are rapidly updating their apps to take advantage of its unique form factor,

Apple has acknowledged "a small number" of reports of cracked iPhone Duo screens, but the cause remains unclear.

Apple’s “precision-engineered” hinge is apparently damaging some iPhone Duo screens. The iPhone Duo launched last week, offering anyone willing to spend $2,000 a chance to experience Apple’s first foldable phone.