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Apple has officially acknowledged display cracks in a small number of its first foldable iPhone Duo units and is offering free replacements, according to multiple Korean outlets. Yonhap reports Apple confirmed the defect and promised no-cost exchanges, while Dong-A Ilbo notes Apple Korea issued a statement saying “a small number of iPhone Duo products” have internal display issues and that affected users will be guided to replacements. The Chosun Ilbo adds that Apple says the problem is limited to “extremely few” devices. However, Dong-A Ilbo reports the domestic launch price is 3.29 million won and raises concerns about possible hinge defects and insufficient replacement inventory. Business Korea also notes the acknowledgment came just four days after launch, and that Apple has not explained the cause or whether hinge design or manufacturing flaws are involved.