Both Samsung Galaxy Note 3 and Note 4 on AT&T gets updated to Android Lollipop 5.0 official firmware release.
Samsung Galaxy Note 3 and Galaxy Note 4 owners on AT&T network will be happy to receive the Android 5.0 Lollipop and after months of wait, the update is finally available. Yes, this is official release by Samsung and AT&T bringing the material design.
For Galaxy Note 3 the update file size is around 1.2 GB and we recommend you to connect your device to free WiFi as data charges will consume much of your limited GB available per month. It brings the build number as LRX21V.
For Galaxy Note 4 too, the update file size weighs 1.2 GB and build number after updating to Android 5.0.1 will be LRX22C.
If you own any of these two Galaxy Note phones, then do head to Settings > About Phone > Software Update and hit Check Now.