For anyone looking to set up Puretalk Voicemail:
- Disable Wifi (or disable wifi calling)
- Dial 1 … (example 14729624532)
- Setup voicemail
- If setup doesn’t come, you might have to reset it from your online account. When you go on your account website, look under PLAN tab and on the left side it has Reset Voicemail.
Courtesy this Reddit thread.