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Press the Voicemail button.
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Press the Call VM button (located just below the screen)
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From the voicemail Main Menu, press 7 to access Mailbox Options.
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Press 7 to listen to deleted messages (you can manage these messages as if they were new messages).
Note: Once you delete your messages you will be able to retrieve them until midnight of that night, after that they will be permanently removed from the system.