Answered (by mistake--thought it was someone I knew). Caller ID said only "wireless caller." It was a robocall telling me I won a "free cruise" but I'd have to participate in a "brief survey" before I could find out about my "free cruise." I hung up before the "brief survey" started.
The brief survey thing is a lame attempt to get around the DNC law. It doesn't wash and they do not get away with it either. However, the free cruise is also a lame scam as they do ask for money which is illegal. There always seems to be a lame fee of some sort attached to that free cruise.
Its ILLEGAL to ask for money to receive it.
Prize Offers: You Don’t Have to Pay to Play!
http://www.ftc.gov/bcp/edu/pubs/consumer/telemarketing/tel17.shtm
http://www.consumer.ftc.gov/scam-alerts
http://www.consumer.ftc.gov/articles/0076-telemarketing-scams
Do consider maybe getting a call blocking device or phone.. You can google them and many are around $60.00 or so.