Even though this number is similar to numbers in my area, I didn't recognize the number, so I let it go to voicemail. No message was left, and the caller immediately called a second time. This time, I figured it could be someone I know and decided to answer it, but all I could hear was static for two seconds and then "click" and it hung up. I'm betting it's a robo dialer fishing for active numbers... and now they know my cell is one of them :/