T-Mobile Samsung Galaxy S8/S8+ now receiving Android Oreo update
T-Mobile subscribers with the Galaxy S8/S8+ are now receiving Android 8.0
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.
source: TMONews
Things that are NOT allowed: