Why do I get calls of silence?

I don't answer numbers I don't recognize because they're always spam, scam, or silence. In fact I block them as they come (but they're always coming ๐Ÿ˜’) Anyway, as for the silent ones.. What's the deal with that? Not only are their voicemails just silence, but even if I answer, which I did out... show more I don't answer numbers I don't recognize because they're always spam, scam, or silence.

In fact I block them as they come (but they're always coming ๐Ÿ˜’)

Anyway, as for the silent ones.. What's the deal with that? Not only are their voicemails just silence, but even if I answer, which I did out of curiosity, it's still just silence! Why? What's the scam here?!
Update: I stayed silent waiting for it to speak the first time, so I said hello the second and third time, but still no response..
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