Samsung has unveiled a folding handset at an event in San Francisco.
It described its Infinity Flex Display as "the foundation of the smartphone of tomorrow" and said it intended to start production within months.
When unfolded, the device resembles a 7.3in (18.5cm) tablet.
When closed, a separate smaller "cover display" on the handset's other side comes into use.
Samsung has teased the concept for more than five years and had been vying with Huawei to show off a device first.
When closed a single screen is seen, but when open a separate display on the reverse comes into use, however, both were upstaged a week ago.
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