Sprint announced that the Samsung Galaxy Note 4 is getting Android’s latest software, Lollipop. The roll out should automatically look for the update, but if you just can’t wait you can manually check for the update.
From the home screen, tap and drag the notification bar down. Then tap the settings icon, scroll to the system section, and tap system update. Then tap update now, and if the update is available click to install it.
One installed you will be running Android 5.0 Lollipop with added Wi-Fi calling enhancements. Lollipop adds tons of enhancements, with the most obvious change being the new Material design.
Here is a link to Google’s page on Android Lollipop where you can read through the long list of changes for yourself.