This reminds me of a robo-call. You answer, the system hears a "hello" & then the prerecorded sales pitch (or con) lets you know about your "free cruise" or blah, blah, blah. As the previous answer to my report states - "answered call and nobody was there". I don't have an explanation for the idiotic behavior - only...I don't answer unknown callers, they don't leave messages, and then I call-block, repeat. Message to A-hole making these calls: I have a short list of possibilities & soon the apt will be ready to trace you past your servers. Spoof-ability will be non-existent soon. Yup...I know you come here to see the reaction to the number you're using. You are a real A-hole.