The called me today without leaving a message.

Could hear a room full of activity but caller hung up after a few seconds without saying anything.  I suspect they were phishing for active numbers.They won't bother me again as the number is blocked.

Called around 8pm last night... I said Hello 3x, but no answer so I hung up.

Saw the number.  No name.  Looked it up and saw from the below postings that it might be World Vision.

I also sponsored a child, and now get calls every so often from World Vision requesting more funds for urgent crisis around the world.

Called me once before today... I ignored it... today called again... I ignored again and came here... saw Crystal's post - I too have sponsor child so maybe it's actually World Vision.