Comes up when called back as "I'm sorry, but the person you called has a voice mail box that has not been set up yet". Assume telemarketer - area code is San Diego County, California - I'm in North Georgia.
I received a call from this number, 10 September 2015. No mailbox when called back. Left no message. Assuming a telemarketer since the area code is from San Diego and I live in the midwest.
This was a robo-call offering a free trip to Orlando. The computerized voice asks you if you have a credit card of some type, saying that "almost all resorts require some type of credit card." I didn't answer the questions, and the computer apologized for bothering me and hung up. This seems like a dangerous scam to get credit card information.