How do I recover a deleted Unity voicemail email message?

This article summarizes how to recover a deleted Unity message.

Unity uses a unified inbox between voicemail and email. Deleting the email notification of the voice message will also delete the message in your voicemail box. 

If you need to recover a deleted message, you can do so either over the phone or on the voicemail website. To access your messages via phone, log into your voicemail and press 3 for “Old Messages” and press 2 for "Deleted Messages". To recover them online, log into and select “Deleted Items”.