LG LGMS840 - Manual (Page 66)

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Calls
Listening to Your Voicemail
When you have a new voicemail message, the Voicemail notification icon
appears in the Status Bar. If you have not set up your voicemail number,
or if you need to change it, you can do that in the Call settings.
To listen to your Voicemail
 Open the Notifications panel and touch New voicemail.
OR
 Touch and hold on the dial pad to listen or manage your voicemail.