Who called from 8014878190

I received two calls within 5 minutes of eachother. When I answered each time, no one was on the line.

No answer, no message.

Missed call; no voice mail.

Didn't answer, message established but no voice message left

I didn't answer the call on my land line, no message was left and the caller id didn't pick up the number but a few seconds later a call on my cell which I didn't answer, no message, but this was the number that was calling.  Strange.