Huawei, China's first smartphone with a collapsible screen in Barcelona, presented the event.
The most basic feature of the phone, which will be released under the name Mate X, is to fold out and turn into a 20-inch wide tablet.
When the phone is closed again, the width is 16.7 centimeters.
Another feature of the phone that will support the 5G network is the sale price of 2299 euros.
Less than a week ago, Samsung's competitor presented its first foldable display.
Richard Yu, one of the directors of the company presenting at the World Mobile Congress, described the phone and its technology as sunum travel to undiscovered Dünya.