how spam callers leave a message so fast.

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Lately I’ve been getting spam calls that are only 1 ring long (I can’t even pickup fast enough to answer them). Then, it hangs up, and immediately there is a 30+ second voicemail available about mortgages or car insurance or whatever. If the ring is half a second and the whole call is only 2-3 seconds, there’s no way they’re actually leaving a 30 second voice message in real time. What is happening? How do they do this, and can I do this to other people?

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