SEOUL, August 16(ABC): Samsung Electronics (005930.KS) unveiled its latest high-end foldable smartphones on Wednesday, keeping prices at the same level as last year’s in a bid to cement its leadership in an expanding niche market. The smartphone maker priced its clamshell Galaxy Z Flip4 at $999.99, and the 5G-enabled top-line Galaxy Z Fold4 with a 7.6-inch main screen to start …