T-Mobile Samsung Galaxy S8/S8+ now receiving Android Oreo update
Android 8.0 includes the new picture-in-picture feature that allows users to watch video while performing other tasks. Also included in the update is the new streamlined Settings menu, Background Execution Limits for better battery life in standby, the ability to snooze individual notifications, and the new notification dots to alert users to specific apps where they have an unread notification.
The update also includes the February 1st, 2018 security patch, and Samsung Experience 9.0. The latter includes improvements to the Edge panels, new clock styles for the lock screen, and an Always On display.
Once you receive the notification that the update has landed on your phone, make sure to connect with a Wi-Fi network before downloading and installing the new files. In addition, check to see if your battery is fully charged before you start the process of loading the update on your handset. If you can't wait for the notification, you can try to coax the update out manually by going to Settings > Software update > Download updates manually.