The vast majority of voicemails that I get from unknown numbers are a prerecorded pitch about improving SCO. Too bad I registered some websites before there were privacy options to prevent personal info from appearing in a whois lookup.
Even better: let me set a list of keywords that flag or delete messages if they appear in the transcription. Sigh.
Most likely the other messages that are not spam.
In this day and age people should be texting me if they want my attention