Samsung Electronics on Tuesday unveiled a foldable smartphone and put 5G mobile network capabilities into all of its other flagship devices as it strives to retain the mantle of biggest global phone company.<br /><br />Samsung's second attempt at a folding phone comes as the South Korean firm fends off its rivals, Apple and Huawei that have eaten into its sales in China and Europe.<br /><br />The Galaxy Z Flip, with folding glass, starts as a large square when closed and expands to look like most smartphones.
