When first implemented, just having the feature enabled caused a noticeable battery drain on the S7, and users disabled the feature for that reason.That's what I was referring to. Was that issue every fixed?
On S7, open phone application. On top right, tap on the three vertical dots and select settings. From the settings page, you'll find VoLTE option.I have it enabled since the Nougat update and haven't had any issues.