I got a call on my cell from this number. When I don't know who it is, I figure if it important enough, they'll leave a message. If they don't I google the number and see what I can find out about the number. When I find a site like this one that tells me it is a scam. then i just use the block this caller feature on my smart phone. Thanks everyone!
Talk with them like you are interested and waste as much of their time as you can without divulging any true personal information. I do it all the time and it's fun. Time is money to these people and the more you waste, the less they can scam others.
Invest in a call blocker or at the very least, don't answer calls from numbers you don't recognize and don't call numbers back "just to find out who called." If they don't leave a message, they aren't worth your time.