Unfortunately still not working for me still (Galaxy S5, Android 4.4.4, AT&T). I've tried all of the above fixes, nothing works. Am still not getting text message sound when message app is open and chat string is ongoing, only when the app is closed do I hear a notification sound then, upon opening and reviewing message, should that person keep texting, no sound. I've also tried installing a 3rd party message application from Google Play Store just to test it out, and still have the same problem, no sound with chat/message text string. ANY THOUGHTS APPRECIATED. Thanks! (If / when AT&T updates to Lollipop maybe this will go away ugh.)