Phone rings, number comes up, but unknown caller in id space.  I don't answer, phone only rings 3 times then quits.  Activated block anonymous caller feature on phone.  Curious to know who these people are, call frequency is every day, 2-3 times.

I just got a call from them as well. I didn't answer and called back from a different phone. The recording says it is National Insurnace Advisors. I have been looking for health insurnace quotes so I assume its from that.

This company has called me several times.  They either hang up when I answer or they don't leave a message on my machine.  I called them back, informed them I didn't want to be called again and threatened to report them to the police if they did.  Hopefully that will stop the calls.