Samsung Galaxy Tab A
1 Find "Settings"
Press Messages.
Press MORE.
Press Settings.
2 Turn on notifications
Press Notifications.
Press the indicator next to "Notifications" until the function is turned on.
3 Select message tone
Press Notification sound.
Press the different message tones to listen to them.
Once you've found a message tone you like, press OK.
4 Return to the home screen
Press the Home key to return to the home screen.