On September 14, Samsung announced the first One UI 4 public beta for the Galaxy S21 series. Like previous years, the beta was limited to the latest Galaxy S flagship, giving owners of the Galaxy S21, S21+, or S21 Ultra an early look at the changes. Samsung rolled out the second Android 12 beta on October 5, bringing Google's Material You's color extractor feature and bug fixes. The third and fourth betas were made available in subsequent weeks with bug fixes.
After two months of testing, Samsung started rolling out the stable One UI 4 build from November 15. The Galaxy S21, S21+, and S21 Ultra are now receiving the stable version of Android 12 in select markets, and the build will make its way to all devices globally over the coming days.
Samsung makes the best Android phones you can buy today, and the fact that it rolled out the Android 12 stable build just a month after Google shows just how much the Korean manufacturer has changed in this particular area over the last three years. With the Galaxy S21 series already receiving the update, the focus has shifted to other devices in Samsung's portfolio; most of these phones will start shifting to One UI 4 over the coming weeks and months.