Samsung has unveiled its much-anticipated folding phone at its developers conference in San Francisco.
The device does not have a name yet but the flexible mobile screen technology is called the Infinity Flex Display.
The company hopes to mass produce the phone – which unfolds from a compact smartphone to a 7.3-inch tablet – "in the coming months".
There is also a secondary screen that can be used when the phone is in a compact mode.
Samsung is facing tough competition to deliver its foldable smartphone, with Royale Corporation, a California-based tech company, unveiling its challenger in Beijing last week.
Samsung's device is expected to cost more than £1,000 when it is launched in 2019.
Foldable phones hold out the promise of allowing consumers to do more complex work that would normally be done on a tablet or laptop.
It will require developers to tweak apps to make sure they run smoothly when the phone folds out into tablet form.
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Dave Burke, vice president of engineering for Android, said: "It's an exciting concept and we expect to see foldable products from several Android manufacturers.
"In fact, we're already working closely with Samsung on a new device they plan to launch early next year."