It called at 10:41 AM today on June 22nd. I heard it call because it was under my pillow but because I didn't recognize the number I just let it rang. Left a message at 10:42.
All I heard was "vacaciones" and some other words I didn't recognize. I took spanish for a year at school but I can't translate it.
I believe this to be a call originating from a correctional facility. The number is from a third party telephone communications provider to inmates. Kind of like a collect call. It is why there are never any messages left and why you cannot call it back.
This number calls both my cell and my daughter's repeatedly. They never leave a message. I have not answered them, but my daughter did and they were speaking in a Spanish-like langauge that my daughter did not understand. She is fairly fluent in Spanish, so that was odd. And they call and call and call.