SCAM, SCAM, SCAM. SPOOFED NUMBER!!!! If the number is "not assigned" when you call it back, then someone is spoofing the number for criminal purposes. Don't fall for it!!!

Called my cell phone and left no message.  Not first time they called me.

just got call, rang once but nothing on other end.

I got the same call at 9:33 am.  Called it back and the number is not in service.

called me twice within seconds, both hung up before I pick it up. Didn't call back since I think it's junk call.

Same message "You've won 2600 airmiles. Press 1 to continue". Number blocked.