Telephone Judo
This is a bit more subtle, and plays to the fact that I myself have worked in (inbound) call centers.
The object of the game is to get as much information about the caller as possible without giving up anything about myself.
I will usually let them talk for a minute or so, then interrupt them to say "Wow, you have a great phone voice and manner. Let me ask you, are you satisfied with the pay where you are working?"
When they admit they are not, I will go on to pitch them on some better scam, something like reverse mortgage or time shares, so there is crazy commission involved...and tell them that I am staffing the call center now. How can I get more information to them?
Almost every caller I have run this on has supplied me with their name and at least some contact information. I don't do anything with that info, I just count acquiring is as a win at telephone judo.