A smartphone that primarily uses a flexible OLED screen that can be folded. There are two kinds. The first resembles the flip phones of the past, which is a phone that folds in half; for example, see
Galaxy Flip. The second type is two or three full-size phone screens hinged together that open into a small tablet (see
Galaxy Fold and
Huawei Mate XT). See
Surface Duo,
FOLED and
foldable iPhone.