I received this call and when she stated it was a survey and I needed to answer one more question "how satisfied are you with your phone provider". I then asked "what survey did I do"; the lady then listed 3 and ended with "it could have been an app, i really don't know". I answered the question and she transferred me to "another lady" and when it asked for my city state and zip I hung up. If I did a survey it would have more information about me besides my telephone number.
Got the same call a little while ago. I could tell it was a scam said I really can't talk now and as I was hanging up still heard her talking away about completing my survey for a $300 gift card. (Perhaps she is still talking to thin air :P)