S6 active is the only phone with that feature. They are testing it. It was also pushed out with there 5.1.1 update on thursday. So your not doing anything wrong. Just like WiFi calling is iPhone only right now.
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Just switched from t-mobile and it had video chat on the note 5.......I thought I was switching over to a more grown up and responsible network such as att but I'm starting to question myself of why I did make the switch. AT&T is way behind with this update !!!!! Thinking about going back to t-mobile