Good news to all Samsung Galaxy Note 4 owners! Samsung is releasing major software update, Android Lollipop 5.0.1 via OTA. You may want to check the software update in your phone. Under Setting > About phone > Software updates > Check now. You may try to update your phone via KIES by connect it to your PC and launch the KIES software.
Aside the usual Lollipop goodies such as lock screen notification, Material Design, screen pinning, smart lock, Android Runtime for improved in-app performance, search functionality within the Setting app, new card-based Overview menu, redesigned Quick Settings and notification bar, improved security, or better battery statistics, the new update will also arrive with tweaks for Samsung’s TouchWiz UI and update Samsung native apps.
Make sure your are connected to a stable WiFi network to avoid unwanted shock mobile data charges as the firmware file has a size over 1GB.