AT&T has started pushing out a new update to Samsung Galaxy S7 units on its network. Arriving as build number NRD90M.G930AUCU4BQF3, the update brings along several changes in the form of bug fixes as well as improvements. Specifically, issues related to Calendar, Samsung Knox, and messaging have been fixed. As for improvements, those are related to video calling and system stability. And finally, the update also includes Android fixes for the month of June. Source | Via
Source: http://www.gsmarena.com/new_at_t_galaxy_s7_update_fixes_issues_related_to_samsung_knox_and_messaging-news-26081.php