Tiboric via XDA Developers forum has discovered you can activate the following features if they are not already active in your S6/S6 Edge.

Wi-Fi calling
Scheduled text messages in Messaging app
Exit buttons in default browser
Native voice call recording
Hide NFC icon in status bar
Sort app drawer alphabetically
Shutter sound switch in Camera app
Use camera during calls
Manual rotation option in Gallery app
Continuous music while using Camera app
2nd symbol keys on stock Samsung keyboard
VoLTE support

Only one downside and that is you need to be rooted to get these to work.

For more details – http://forum.xda-developers.com/galaxy-s6-edge/general/quick-guide-enabling-hidden-features-t3087506