I don’t record them. I have the google drive app on my iPhone and when you go to your voicemails, select one and press the share button. You’ll then have the option to upload the voicemail to google drive as an audio recording.

I upload the voicemails I get from my parents to my google drive before deleting them. I know it sounds morbid but I do it to have something to listen to after they inevitably die. They always say something sweet or silly in them, theres one that’s just 30 seconds of my dad making fart sounds with his mouth 😂