Received a call this morning from a number I didn't recognize and did not answer it.  The caller left no message.  Interesting to note, the same number is on your list.  Thanks for starting this informative website!

Received a call from this number today, no message was left. I tried to call the number back and it was busy.

This number called my phone today left no v-mail . Can't call number back ...... It's busy then hangs up on me

This number also called me today. One ring then hung up. Its important for you not to call this numbers back if you don't recognize them. It could be a scam looking for smart phone data. If they don't leave a message, it wasn't important. I sometimes look the numbers up just to see if anyone else received a call. I recently saw on the news there was a new scam going around that had American numbers but was actually foreign linked.

same thing! Rec'd call, no msg