I have a phone with an area code far away from where I live. If I get a call from my phone's area code or one in the surrounding area not in my address book, it

I have a phone with an area code far away from where I live. If I get a call from my phone's area code or one in the surrounding area not in my address book, it's spam. If I get a call from an area code where I actually live, it's usually not spam.