in the past few weeks i've been getting some mysterious phone calls. basically, the phone rings, i say hello, but there is dead silence on the other end. no static, not even background noise. been happening off and on for a few weeks now... oh and i dont have caller id or anything. just basic service. so tonight the same thing happens. i have no idea who the person is, or who knows, maybe it is a dropped call? but anyway, i decided to try to do *69 to see who it is, and when i did i got 'the number is unknown' automated message. anyone know what that means? would that be like an unlisted number? or possibly a cell phone? this is all through bellsouth btw.