> It's common where I am to get spam phone calls that spoof Caller ID to match the area code and first 3 digits of your own number, to appear "local" and make you think it might be someone you know.

I see this technique very frequently too - I have to wonder if this technique work to get people to answer!? Personally if I see a call from a 415 number that isn't already saved in my contacts list, I hang up and block it immediately because the chance it is spam is so high!