Two ring scam. The idea is to let the phone ring two times. Just enough to trigger the caller ID. Then the curious just HAVE to phone them back - got a live one.
I saw a missed call from them from 10:49PM. Long after I'd been asleep. They didn't leave a voicemail. I was curious as to who it may be. The number is from Greenville, SC, as am I so I thought maybe it's someone I knew, but probably just coincidence.