The Samsung Galaxy Fold, unveiled on February 20, 2019, was Samsung's first foldable smartphone, featuring a book-like design that opens to reveal a 7.3-inch tablet-sized flexible display alongside a smaller cover screen. While praised for its innovative design, it received heavy criticism for durability, leading to a delayed launch in April 2019 after review units broke. Samsung fixed the issues with reinforced hinges and protective layers, finally releasing the phone globally on September 6, 2019. The company initially claimed to have sold one million units by December 2019, but later admitted this was a sales expectation, not actual sales. Its successor, the Galaxy Z Fold 2, was announced on August 5, 2020, and the device retroactively became part of the Galaxy Z series.