Who called from 2074932618

Received a call from this number at 9:40am today (5/26/11).  Normally don't answer call w/o name, but inadvertently did this time.  No answer when I responded.  Who the heck is this?  Does anyone know?

Received call at 10:15 on cell.
I give this number in stores. Is this how they get the number?

Received call at 2:01pm on cell on cell.

I constantly get calls from Caribou, ME under different numbers telling me about a cruise I won or something. I know it's automatic BS so I want them to stop calling. How can I do that? It's always automated.

Keep getting calls from this number. I assume it is health insurance related, but i never answer.