Samsung SPH-M520ZSAQST - Manual (Page 232)

206 Section 3A: Qwest Service Features: The Basics
Clearing the Message Icon
Your phone may temporarily continue to display the message icon after you
have checked your voice and text messages.
To clear the icon from the display screen:
1. Select Menu > Messaging > Voicemail > Clear Envelope.
2. Select Yes or No and press .