AT&T is finally sending out the update to Android 7.0 Nougat for the HTC One M9 units it's sold. The unlocked version of the phone got the same software back in December of last year, so this has definitely been a long time coming. More recently, we've seen T-Mobile rolling out the update in March. Now though it's heading out to One M9 devices purchased from AT&T. Since it's an over-the-air rollout, expect a few days to pass before every single unit out there receives the update notification. If you're impatient, however, there's always a chance you'll get it faster if you manually check...
Source: http://www.gsmarena.com/at_ts_htc_one_m9_is_now_getting_the_android_70_nougat_update-news-25063.php
