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Apple has officially acknowledged a display defect in a small number of its first foldable smartphone, the iPhone Duo, and announced it will replace affected devices free of charge. The admission came just four days after launch, following reports of internal screen cracks. Yonhap reports Apple confirmed the issue and its replacement policy, while Dong-A Ilbo notes Apple Korea issued an official statement on Oct. 27, saying “a small number of iPhone Duo products” have internal display problems and that affected users will be supported with exchanges. Chosun Ilbo adds that Apple says the problem is limited to an extremely small number of units. However, Dong-A Ilbo reports that Apple did not explain the cause of the damage or whether there is a hinge design or manufacturing defect, and that concerns are rising over replacement inventory shortages. The domestic launch price is 3.29 million won, and Business Korea notes the response comes just four days after the product's release.