Who called from 5106010511

Hung up.  No msg.  But appears to be a valid number held by someone I don't know.

This number has called me twice today -- I didn't answer the first time, and the 2nd time, I figured I'd pick up so I could post something about it here. However, there was nobody there. It may have been a valid number, but I'm pretty sure it's being spoofed.

this number calls at least once a day.  They hang up once you say hello.  I have tried to call it back but it just rings busy