Samsung's first foldable smartphone, the Galaxy Fold, features a 7.3" 1536 x 2152 foldable Infinity Flex AMOLED display that folds inside, in addition to a secondary cover display - a 4.6" 840×1960 Super AMOLED.
The Galaxy fold sports very high specifications - an octa-core chipset, 12 GB of RAM, 512 GB of storage, a large battery, triple camera setup on the back and dual front cameras. There's also AKG stereo speakers.
Samsung's Galaxy Fold was supposed to ship in April 2019 for $2000 - but Samsung delayed the launch following reports of broken review units. According to reports the issues have been fixed but a new release date has not been announced yet.
7.3” QXGA+ foldable + 4.6" HD+ AMOLEDs