The voicemails display under "Voicemail" in the Google dialer app complete with phone number, duration, and timestamp, but after attempting to load the voicemail I either get "Couldn't play voicemail", or "Unsupported message type", or a banner on the top of the screen displays saying "Couldn't update visual voicemail. Try again when your network connection improves"
I have sandboxed Google Play and Carrier Services installed with network, phone, and call logs permissions. I've tried everything I can think of including uninstalling/reinstalling each app, clearing caches, rebooting the phone, disabling VPN, and checking for updates. I tried using Tracfone's support but they're completely useless as always.
FWIW, visual voicemail worked fine with the same SIM and same number on iOS.