https://www.cnet.com/news/sprint-and-samsung-plan-to-release-a-5g-phone-this-summer/

5G, the next generation of cellular technology, is expected to significantly boost speed, coverage and responsiveness of wireless networks. It promises to make data speeds 10 to 100 times faster than the typical 4G LTE network today. That could mean downloading a movie in seconds, rather than minutes.

In December, Verizon and Samsung said they'd bring a 5G phone to the US market in the first half of 2019. AT&T and Sprint quickly followed suit, saying they would also offer 5G devices from Samsung.