The foldable screens could increase display space to the size of a mini-tablet, but fold like a wallet so they revert to the size of regular phones. "When closed, it's a phone that fits neatly inside your pocket". If you want something bigger you can unfold to reveal the larger tablet display hiding inside.
Samsung says it will be ready to hit the market at some point next year.
"It's an exciting concept and we expect to see foldable products from several Android manufacturers", he said.
The smartphone also works with Samsung's revamped smartphone user interface, dubbed One UI, that was created to work with the device's multiple screens.
We also now know that the phone can be folded "hundred of thousands of times" without getting damaged, and that the screen, when unfolded, measures 7.3-inches.
There's been plenty of talk of the Korean firm's plans to unveil a foldable device and it appears a launch could be imminent.More news: Pres. Trump: Republican Party Will Do Well In Upcoming Elections
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While at its SDC 2018 developer conference in San Francisco, Samsung showed off a rather thick smartphone that folds.
Concrete details about the device are light on the ground, but we were promised at the conference that the "device inside here" is "stunning".
Samsung's One UI will roll out with the Android Pie update, but the firm will let users try a beta version of it for the Galaxy S9, S9 Plus, and the Note 9 before it rolls out in January.
Samsung on Wednesday gave the first glimpse of its upcoming foldable phone, saying it'll be mass produced "in the coming months".
Android will now support devices that are half-phone, half-tablet with a high-tech, wraparound screen. LG Electronics is widely expected to unveil one at the CES gadget show in Las Vegas in January.
This potentially means Samsung will launch four major smartphone models in 2019 - the Galaxy S10, folding "Galaxy SX", Galaxy Note10 and an all-new ultra flagship.
Rumours suggest Samsung could place a price of over £1,300 on this new phone.