I know there has been an increase telemarketing and scam calls. Try searching for your number and your name. I know Facebook asks for your number at one point or another and I don't think they hide it unless you state otherwise.
I have a phone number from another state.. and I've since moved, well over 5 years ago.. yet I still get calls from my former state. Why would anyone be calling me from my former state when I haven't lived there and have no business there? I also think the robocallers are simply dialing numbers at random. I mean.. it's not hard to generate a 10 digit phone number and just call every single one and hope it hits.
Kind of similar to the brute force method.
A few years back, I purchased solar panels, but before I found a company I went with, I put my phone number into a system and for months, I was getting phone calls from robots, asking for me by name, and if I had solar panels... and depending on my response, they would continue. If my response was different, the voice would, "Hello? Hello? I think we almost got disconnected there! I hope you can hear me now! Are you a homeowner? Are you ready to get off the grid and go with solar?" Even though my response was like, "I've already got solar..." They apparently don't understand, "no" or "not interested."