Got the same call. My caller ID showed it as a Califonia # and since I have a few friends out there I assumed it was one of them, so I answered. They hung up immeditaley. That is when I noticed that the phone # had too many #'s and realized that it was an iternational call. I figured this was a scam so I called Sprint to report it...you know CYA. They said not to worry (if there are any charges they will be waived) but if I was registered on the do not call list to report it there as well.
Got similar call on my cell phone, Caller ID number was +442074593791. I got a woman with a spanish accent calling regarding lowering my credit card rates. When I pressed her for information as to which of my credit cards or banks they were calling from, she went on with the pitch about saving interest on my credit cards.
I cut her off, and asked for a supervisor. He identified himself as "Renzo", in his words "Like Lorenzo but just Renzo". I let him know I was on the do not call list and that I would report the call to the FCC. He backpedaled and said he would put me on his "personal" do not call list. He also mentioned something about being a non-profit, and that they're only trying to help people.
Most likely, they're trying to help themselves to someone's credit cards.