https://wccftech.com/razer-phone-2-finally-gets-android-pie-on-att/

Razer took a reasonable amount of time to roll out the Android Pie update for their latest flagship—the Razer Phone 2. Its predecessor, on the other hand, had to wait an obscene amount of time and received the update only a few days ago. There was, however, one variant of the Razer Phone 2 that was still stuck on Oreo till today. For reasons best known only to them, AT&T decided to wait until today to roll it out. This is one of the rare instances where a carrier-unlocked device receives a major software before a carrier-locked variant.

Features wise, it is no different from the build that the carrier-unlocked and international variants of the device. You get a redesigned UI which brings the device on par with Google Material Theme standards introduced last year. Most of the icons have a new design, and the Settings app gets a fresh coat of paint as well.