Same here. Must not be calling many people. If they are an OK number they should be leaving a message. =( But NO ONE except close friends and family should have this cell number.
Called me and left a message saying "This is Carlos, please call me at 909-XXX-XXXX. Again, call Carlos at 909-XXX-XXXX." The number he left was actually different then the number he called from but I didn't write it down so I am not sure what the full number was. Obviously, if this was a legitimate call, he would have stated his reason for calling/what company he was or why I needed return the call.