They called my private cell phone Tuesday, 10 February 2015 at 2:06 PM Pacific Time. The caller ID displayed "Frisco, TX". I did not answer and they did not leave a message.
If they hang up on everybody who actually answers, then it may be a computerized call to update a database that gathers information on which phone numbers are active, what type of person answers, and at what time of day.
I received this call on my cell phone. Of course I didn't answer it. But I did call it back. The call is from Frisco, Texas. It was a recording that said I had won a 100 gift card from some store I visited online?? There were also a choice where I put my number on a do not call list. So I did that.