South Korea, eager to keep its title as the world's most connected nation, has announced that it will spend $1.5 billion (1.6 trillion won) on rolling out a next-generation mobile 5G network. What actually constitutes a 5G network is a bit nebulous at the moment, but the general consensus is that it would be tens or hundreds of times faster than current 4G LTE networks, with download speeds in the region of 100-1000 megabytes per second -- fast enough to download a TV episode or movie in a couple of seconds.