Who called from 7155716045

I answered the call, in spite of it coming from a number I didn't recognize and no Caller ID was provided.  After saying hello, there was no response.  I said hello three times... and paused.  The phone call disconnected.  I assume it was a robo-call.

I just got the same call but didn't answer it. Must be a new scam.

I just got the same call, but didn't answer it.

I received the call as well today.  I didn't answer & there was no message left.  Called the number back & a message said that the caller hasn't setup an voice mail yet.

Unkown number to me, called my mobile.  I rejected it, left no message.  Blocked.  ANNOYING!