Do you own Samsung Galaxy Note 2 or either Galaxy Mega or even the Samsung Galaxy S3 phone contracted from AT&T? Then you should checkout the availability of new software update on your device, definitely not the Android 5.0 Lollipop.
All of these are mentioned as ‘Android OS Enhancements’ and are pushed to users via user initiated software updates. So you should go to Settings > More > About Device > Software Update and then hit Check for Updates.
Galaxy Note II i317 Update
The update file sized 93.2 MB will bring the build number as KOT49H.
Galaxy Mega i527 Update
The update file sized 77.3 MB will bring the build number as KOT49H with I527UCUBNJ1 Baseband version.
Galaxy S3 i747 Update
The update file sized 69 MB will bring the build number as KOT49H with I747UCUFNJ1 as the baseband version.