To hear the message tone when you get a message, the message tone needs to be turned on.
Solution: Select message tone
1. Find "Settings"
Press the message icon.
Press the message icon.
Press the menu icon.
Press Settings.
Press Notifications.
Press Received notification to turn on the function.
Press Play notification sound to turn on the function.
Press Notification sound.
Press the required message tones to hear them.
Once you've found a message tone you like, press APPLY.
Press the Home key to return to the home screen.