Flip phones are back with a vengeance - last year's tablet-sized folders are giving way to vertical folders. The Samsung Galaxy Z Flip will be unveiled at the Unpacked event in February and it will be the first phone with Ultra Thin Glass (UTG). That may not sound like much, but the much increased scratch resistance of UTG compared to the plastic screen cover of the Galaxy Fold, Mate X and even the upcoming Motorola Razr can make the Z Flip the first practical folder. In early 2019 we were thinking that an inward folding design would be enough to protect the screen, but reality proved...