In pics: Samsung unveils Infinity Flex, the much-awaited 'foldable' phone

Samsung's foldable phones promise the screen of a small tablet in a pocket-sized device

Samsung Electronics Co Ltd unveiled its much-anticipated foldable phone in San Francisco on Wednesday, urging Android developers to start writing apps for it.

Samsung needs to get the foldable phone right to reverse steep declines in profit for its mobile division and restore some of the cachet its brand has lost to Apple Inc .

Samsung Foldable Smartphones promise the screen of a small tablet in a pocket-sized device.

Justin Denison, senior vice president of Samsung Electronics America's Mobile Product Strategy and Marketing, showed a prototype with a screen he said measured 7.3 inches diagonally.

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