Samsungs upcoming device features a 7.3-inch 1536x2152-pixel Infinity Flex OLED display when it is open.
Foldable phones promise the screen of a small tablet in a pocket-sized device. In addition, Android will offer the function "App Continuity" - so apps, which were first started on the main screen, should continue to run without interruption after opening and support the possibilities of the larger screen. It can also display three different apps simultaneously.
As for the OLED display, Samsung says that it can withstand being folded 200,000 times, which corresponds to approximately 55 times per day for 10 years. "We are excited to work with developers on this new platform to create new value for our customers".
The Verge's reporter Nick Statt said that when folded, the phone was "bulky" and "feels miles away in quality" from a high-end smartphone.
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What do you think of how Samsung's foldable phone is taking shape?
There is a high chance it will carry a price tag of around 2 million won ($1,790). Huawei wants to release a foldable handset and LG is working on foldable TVs, according to The Verge.
Reporters at the American technology network The Verge, and digital media website Mashable, were among those to get their hands on Royole's FlexPai device at the event in San Francisco.
Samsung is also adding five additional languages to Bixby in the coming months - such as British English, French, German, Italian and Spanish.