Came here to say this. You pick up the phone to make a quick call, and this is what you hear. Now you're fucked, because someone was using the internet, and you just interfered with that connection potentially dropping it.

It's very similar, it's an image encoded into varying sounds and transmitted. While data was just mark-space two tones, this is frequency modulation. It's still a thing in amateur radio as well, and it's a perfect way to transmit images over long distance when all you have is an audio link.