Hi @18raleigh ,
Welcome to the community!
TPG home phone voice mail is only available during porting, once porting of your home phone is done it will no longer be available. But you may use a handset with a Voice Mail Feature to use it.
On the other hand for Mobile Voice Mail Feature, you may visit this link for more information.
https://www.tpg.com.au/support/tpgmobilesupport/mobile-feature/voicemail.
Let us know should you require further assistance.
Regards,
