https://www.cnet.com/news/at-t-will-offer-two-5g-phones-from-samsung-next-year/

AT&T has installed mobile 5G network gear in a dozen cities to start testing 5G with real-life customers before year's end. The cities are Atlanta, Charlotte, N.C., Dallas, Houston, Indianapolis, Jacksonville, Fla., Louisville, Ky., Oklahoma City, New Orleans, Raleigh, N.C., San Antonio and Waco, Texas. 

Verizon and Samsung said Monday they plan to offer a 5G phone in the US market in the first half of 2019. Sprint also said it's working with Samsung on 5G devices.