https://www.cnbc.com/2018/12/04/5g-phones-are-coming-next-year-heres-what-that-means-for-you.html

AT&T said Tuesday that it will launch its first 5G phone, built by Samsung, in the first half of next year. Verizon said the same thing on Monday, and T-Mobile and Sprint have promised 5G devices in the future as well.

It may sound exciting, but you don't need to worry about buying one of the first phones to support it.