They Call, then Hang Up so you call them back to see who it is. Once you do that you can not add them to the "Do Not Call Registry" because YOU called THEM. It's a new scam way of Calling so they can't get put on the List.
Called my cell today at 11:30am. I declined call immediately & no one left a voicemail. Adding this # to the hundreds of other scam calls I get daily.....
407-530-1014 called me (7/7/16 @ 4:26 p.m.), didn't even ring one time, hung up, no voice mail, so I called the number back, it is some kind of rewards gimmick, the give you the option to press 2 & add your number to the do not call list...