Smitten with Samsung's Galaxy S 4? Well, if you're looking to pick on up right now, you'd best book a red-eye flight to South Korea, where it'll go on sale in the next 24 hours. The 5-inch 1080p flagship will arrive on all three of the country's main carriers, with an unspecified global roll-out following on Friday. Meanwhile, the company has also commented on "supply chain problems" affecting its roll-out of the S 4. In a statement to Sky News, Samsung said that initial supplies may be limited "due to overwhelming global demand". The pinch has already been felt in the US, as both Sprint and T-Mobile reassess their launch dates in-store.