https://www.theguardian.com/technology/2019/apr/04/us-dismisses-south-koreas-launch-of-world-first-5g-network-as-stunt

Half a dozen celebrities were the first to experience the service, carriers say

South Korea has claimed it beat the US by a matter of hours to become the first country to roll out a super-fast 5G mobile network, which allows users to download entire moves almost instantaneously.