I've also done the "moved out of the area code of my number 15 years ago" [1], but someone's gotten smarter lately. They've hooked up to some sort of information source and I'm getting a lot more robo calls from my real area code lately. Since we have so many dozens of thousands of our best and brightest thinking day in and day out about how to violate our privacy, more dozens of thousands figuring out how to monetize that data, and so many dozens of our best and brightest thinking about how to secure that data, I can't even begin to guess what they've got a hold of or what it is, just that it's enough to start spamming me with faked calls that look a lot more real.

I've literally noticed this just in the last couple of weeks; at least for me, it's a relatively recent development. YMMV.

[1]: https://xkcd.com/1129/