Samsung promised it would start rolling out of Pie updates in the US this month, and it's technically living up to that. However, only a few phones have gotten the new version so far, including Verizon and Sprint's Galaxy S9s. Today, AT & T becomes the first carrier to deploy a Note 9 Pie update. You'll have to find some WiFi to get started.
The update hits phones clocked at 1.8GB, and it sounds like AT & T's servers are getting hammered. It could take a while to download, but the reward at the end is the Android 9 Pie update with One UI. That's Samsung's refurbished interface with a dark mode, buttons positioned for one-handed operation, and more.
If AT & T got the update out of this early, the other carriers can not be far behind. It looks like this update cycle will again feature carrier phones getting updates before Samsung's unlocked phones. Unlike other OEMs, Samsung certifies unlocked updates on all four carriers, which leads to delays.