Samsung, which led the popularization of foldable phones through the Galaxy Fold and Flip, is expected to release a three-layer foldable phone soon. Samsung unveiled two prototypes of its latest foldable phone at CES 2022 this year. The Flex S is a foldable phone that can be folded and unfolded in an S shape. It is a foldable phone with in-folding and out-folding hinges applied. It has no external display, but when folded, one side is outside.