Its an AutoMatic Phone Service Called AutoSlider They try to check and see if the Phone Number is Legit then once they the Silent Recorder hear you talk it Traces your Phone number and Tracks your identity until the Phone number and the registry name matches, from there they are able to access your Credit card information and the rest of your personal INformation.
I get 3-4 calls per day and sometimes when i answer, the caller hangs up on me. it's very annoying. other times i answered, they just say I applied for a car loan and i've been pre-approved. SCAM!!! then they give your number to a local dealer in your area and they call saying I showed interest in buying a car.. the whole thing is very annoying