Samsung has experimented with the idea of folding smartphone a few years ago. This is evidenced by photos published on the network.
The concept was called Project V, and wore the SM-G929F. As the Galaxy S6 had the number SM-G925x and Galaxy S7 — SM-G30x, we can conclude that the smartphone was designed in 2015-2016.
The design of the smartphone is exactly the same presented in the autumn of last year, ZTE Axon M: module with display is mounted on a flexible substrate to the main part with another screen and the «iron» component.
The source of the photos said that the project is cancelled: perhaps Samsung has decided to focus on smartphone with a curved display.