Most carriers have focused on using high-band (28GHz) and mid-band (3.5GHz to 6GHz) frequencies for their 5G development, T-Mobile has been going against the grain and focusing on low-band 600MHZ spectrum. They have now completed the world’s first 5G transmission over 600MHz, which could lead the way to faster rollout of their 5G network in the US. The carrier says that its “nationwide low-band spectrum will provide broad 5G coverage for everyone nearly everywhere” in 2020.