Samsung introduced its expected switching phone and invited Android developers to begin writing applications for the new device.
South Korean technology company must perfectly perfect a phone that could reduce the sudden loss of profit for mobile division and to restore some of the products that it lost to Apple.
The foldable phones promise a small tablet screen in the pocket device.
At the discovery in San Francisco, Justin Denison, senior vice president of mobile product marketing, showed a prototype with a screen that measured diagonally 18.5cm (7.3in).
Folded in seems to resemble a fat phone, but Samsung has not given the media or developers the opportunity to touch or see the device nearby.
Dave Burke, vice president of engineering for Google's Android platform, told a conference in California that Samsung was planning to launch a new Android-based device early next year.
"We expect to see the assembly of products from several Android manufacturers," he said.
Google's head of the UK UKS, Glen Murphi, was also on the stage with Samsung and said Google will work with the developer community to add more features to the phone.
Samsung said it would be ready for mass production in the coming months.
Joshua Clark, a programmer at the conference, said Samsung should sell technology to its competitors so the product would be widely accepted.
"I really think that only two companies last, and then they will suddenly get caught," Clark said. "And the fact that Google was on the scene is telling a lot. In order for developers to integrate it with all of their applications, it gives me a lot of trust."
Bob ODonnell, an analyst with Technalisis Research, said that, although the screen that is flexible, provided with a woo factor, customers may not like the thickness of a switched phone or its price.
"They will have to prove that this is more than just a trick," said O'Donnell. "But it's smart to open it earlier for different types of experiences."
Samsung is among the bunch of developers working on foldable phones. Huawei said he plans to launch a 5G smartphone with foldable screen in mid-2019.
However, Samsung and Huawei have been marketed by Roiole, the Chinese screen that began production, which last week introduced a foldable Android phone with a larger screen, at a price of about $ 1,300. Roiole said he would start completing orders at the end of December.