T-Mobile LG G4: backing up voicemail?

[Android Central Question]

T-Mobile apparently is changing its voicemail platform. At that time all voicemail mesages will be deleted. How may I save/backup the messages with their envelope information without using Visual Voicemail, which never worked for me?

 

[mustang7757]

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https://forums.androidcentral.com/showthread.php?t=409154

 

[mustang7757]

I believe they backed up to your sim card , ice noticed when I switch to my other phones with my same sim they are all there.