South Korea is investing $1.5 billion to build out a 5G mobile network by 2020 to further its leadership in mobile technology adoption. The nation's science ministry's plan for a 5G network trial in 2017 and full rollout by 2020 aims to keep Korea at the forefront of mobile infrastructure development after leading earlier transitions to 2G, 3G, and 4G networks. South Korea currently has the world's fastest average internet speeds and highest rates of internet and smartphone use.