AT&T has started pushing out a new update to Samsung Galaxy J3 (2016) units on its network. Arriving as build number NMF26X.J320AUCU3BQI5 and weighing in at 1GB, it's a major update that brings along Android 7.1.1 Nougat. In addition, the update also includes features like Video Calling, and Wi-Fi Calling as well as a fix for the BlueBorne vulnerability (which allows a remote attacker to take control of devices via Bluetooth). Source | Via
Source: https://www.gsmarena.com/nougatupdate_starts_hitting_at_ts_samsung_galaxy_j3_2016-news-27722.php