I got the same thing. Not enough digits in the number. There was a lot of noise in the background, like it was some sort of boiler room call center. They asked for another person and when I said there was no such person at my number, they hung up.
 May 03rd, 2012
no enough numbers for a phone number, can't call them back to find out what it's about. They don't leave a message, and when i do answer, they hang up.
 May 02nd, 2012