Version has started rolling out the Marshmallow update to the Samsung Galaxy Note 4 units on its network. The update upgrades the software version to N910VVRU2CPD1.
The update bumps the Android version to number 6.0.1 that includes all goodies of Marshmallow including, Wi-Fi calling, update to app icons, Ultra High Quality Audio and Android for Work.
You might receive over the air update notification on your phone and if you haven’t received yet, it might take same time, as it is an OTA roll-out. You can also manually check for the update by heading to your handset’s Settings menu.