Got a call from 11-905-993-1212.  The "11" at the beginning threw me off and I figured it was a telemarketer so I didn't answer.  No voicemail left so it can't be anything important.

this number has called me twice now.  in a span of 5mins.  no message.

Got the call X2 today.  Did not answer and they did not leave a message....assuming it was an offer I just could refuse to answer.

this number has called me twice now.  in a span of 5mins.  
no message.

"You have been selected for free air miles" or something to that effect. I have never used air miles. I also have never gotten one of these spam calls before. Very strange.