I requested not to have Voice Mail how do I turn it back on? Moose Support January 27, 2018 10:51 Updated Follow Simply Contact Us and we will reactivate your Voice Mail service once we have confirmed that this has been done all you need to do is dial 321 from your handset and go through the set up procedure. Related articles How do I remove Voicemail and Missed Call Service? How do I make my phone ring longer before it goes to Voicemail? What is the Optus Voicemail Number? How do I activate Call Hold Call Wait? What if my phone says Emergency Calls Only? Comments 0 comments Please sign in to leave a comment.