Samsung Galaxy S6 Edge: How to Manage and Use Rejection Messages in Android 5.1.1 Lollipop

There's a condition where you couldn't answer incoming calls, e.g: when you're busy, in a meeting room, in a class, at the movie theater, etc. However, if you'd like to tell the one who call you about the reason why you didn't answer the call, you can use the reject call with message feature so that your Samsung Galaxy S6 Edge will send the selected rejection message to the caller and reject the