The Samsung Galaxy Z Flip, the first foldable phone with a glass screen, appears to be a hit with consumers.

The device, Samsung's second foldable after its Galaxy Fold, features a clamshell design and is essentially a high-tech flip phone.

The new device joins a tiny but growing collection of foldable phones -- including the Galaxy Fold, the Motorola Razr, the Huawei Mate X and the Royole FlexPai -- that's redefining how we use and think about mobile devices.

Samsung declined to comment on how many of the foldable phones it has sold