DUBAI, UAE, Aug. 1, 2019 /PRNewswire/ -- OPPO, the leading global smartphone brand, has unveiled a prototype device featuring the "Waterfall Screen" design, which has a stronger visual impact due to an almost vertical 88° curved body that makes the device almost completely borderless. It represents OPPO's innovative exploration of brand-new form factor of mobile phones. It DUBAI, UAE, Aug. 1, 2019 /PRNewswire/ -- OPPO, the leading global smartphone brand, has unveiled a prototype device featuring the "Waterfall Screen" design, which has a stronger visual impact due to an almost vertical 88° curved body that makes the device almost completely borderless. It represents OPPO's innovative exploration of brand-new form factor of mobile phones. It