Samsung Galaxy Fold
Samsung was the first company to make waves with its folding smartphone, the Galaxy Fold. Scheduled for release in April 2019, the Galaxy Fold has two screens: One that folds into the inside of the device like a book, and a second smaller screen on the outside that's used when the device is closed.
Rumors are swirling that Samsung is planning two additional folding smartphones to compete with other models slated for release in 2019. One of the devices will fold out vertically, like Motorola's planned folding smartphone, and the other will have an outward folding screen like Huawei's Mate X.
SEE: Samsung Galaxy Fold: A cheat sheet (TechRepublic)