Received a call on my cellphone (on the DO NOT CALL LIST, using my very LIMITED MINUTES).  Number actually identified on the phone as an invalid #:  856-905-5264.  I called that number on my house phone and received a legitimate household's answering machine--so there is something going on with the masking of the source phone number.
Call was a recorded message saying to lower your interest rates now, press 1.  I pressed one and was connected to a person (male, spoke English well). I asked what company this was and he hung up.