https://arstechnica.com/information-technology/2019/11/at-launch-atts-real-5g-will-only-be-as-fast-as-its-fake-5g/

AT&T will soon offer 5G mobile service on its 850MHz spectrum, which will enable wider coverage than existing 5G networks but offer only 4G-like speeds at launch. Significant speed increases will arrive in 2020, AT&T says.