Caller said they knew they were calling my cell phone. Said they were doing survey of cell phone users. Caller did not address me by my name, but then asked if I was situated such that I could answer questions without others overhearing my "private information!" I said no, not now. Caller said would call back some other time! I suspect they would be asking for personal information that I wouldn't be willing to give them! The caller did not identify the company calling, so you can be sure this is some sort of effort to get personal info for identify theft reasons.