Samsung launched the Samsung Galaxy S6 Active back in 2015. The device was launched with Android lollipop as the base OS.
Now the device has been got updated to the Android marshmallow on AT&T. US carrier AT&T has now pushed the Android Marshmallow update for the Samsung Galaxy S6 Active. The device is now getting the Android Marshmallow 6.0.1 . The new Android Marshmallow update brings features like Doze mode, Google Now on Tap, individual app permission. The device is now getting the Wi-Fi calling facility with this update.