Last month we saw the Samsung Galaxy Note 4 on AT&T receive Android 5.0 Lollipop. Now the handset is getting another OTA (over-the-air) update which brings bug fixes and various improvements to the handset.
You should receive a notification when it is available for download, but you can also try manually checking for it from the update menu in Settings. The update is 142MB in size and will only be available over WiFi. It is recommended that your battery is appropriately charged before installing the update.
The official changelog from AT&T for the update is as follows:
- Update Private Mode settings
- EAS fix for encryption bypass
- Removal of Softcard
- Emergency Dial fix related to Lookout & Mobile Locate
- Google Security Patches
source - AT&T