I wondered how the spam callers knew what area code I was in while traveling out of state. I would assume that through clustering analysis (eg coworkers/friend

I wondered how the spam callers knew what area code I was in while traveling out of state. I would assume that through clustering analysis (eg coworkers/friends travel together) even fairly coarse position data can allow you to construct relationships. Then they can spam/fish both you end your coworkers with the same fake number. That makes it seem more important to answer and more organic.