T-Mobile has started rolling out Android 5.1.1 lollipop update to the Samsung Galaxy Note 4 (N910) and Galaxy Note Edge (N915) Smartphones on its network. For the Galaxy Note 4 it comes with the Baseband version N910TUVU2DOK2 (677.68MB in size) or N910T3UVU1DOK2 (223.28MB in size) and the Galaxy Note Edge will be updated to Baseband version N915TUVU2COK2 (150MB in size).
The update is available Over-The-Air (OTA) and via Samsung KIES PC software. It mainly brings Advanced Messaging and T-Mobile Video Calling features to the Smartphones. Aside from these it also brings some security, performance and battery life related improvements.
Notification for the OTA update should automatically pop up on your device when it’s available for you or, you can check it manually by heading to Settings -> About Device -> Software Update.