I only answered this unknown number because it was calling from the same area code we live in.
I am not sure who it is, they seemed nice enough but they were calling for my step-dad's (he is elderly) ex wife whom he has been divorced from since the late 70s, my mother and he have been married since the mid 80s.
So she had to have either given his number out or they looked or people with a similar last name.
The thing is that my parents have been in 3 different homes with 3 different phone numbers and this once since 2003. So for someone to be calling for her is strange.
If it keeps up I will look more into it. I hate it when people don't pay their bills and give other people's contact information out.