Yup, the world’s number one seller of smartphone devices is indeed working on it (as previously rumored). Just this week as it released its earnings report for the fourth quarter of 2017, Samsung stated that one of the ongoing efforts of its mobile division is the continuous exploration of groundbreaking smartphone technology, including the use of foldable organic light emitting diode (OLED) display screens.
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https://www.wirefly.com/blog/news/updates-samsung-s-foldable-galaxy-handset