I called back because I know someone in Illinois, and the automated message said "If you're looking for a way to generate thousands of dollars...This call is without cost." I hung up without listening to more, then blocked the phone number on my cell. I should have followed my personal rule NEVER to answer unknown numbers or call them back. :(
Received 2 calls from this number, both times left a wonderful prerecorded message on my voicemail. I called back, hit 0, and it sent me to someone's voicemail. Informed them that I was on the DNC list. We'll have to wait and see if it works. Seems to be a networking/get rich quick type things.