Who called from 2133370057

Call came in at 4:30 p.m. EST from this number: 213-337-0057 which I answered. I could hear somebody talking but not to me. I waited for the person to speak but they never did. Finally they hung up. Have no idea what they wanted.

I received a call from this number today.......they left no message.. they called on my work cell........because I am from the Los Angeles area code where the call originated I was concerned.  When I attempted to call back I got a strange signal as if the line is out of order......I notice there is a + sign in front of the area code this usually means it came from a computer..
who knows........

who is this? already signed up on the do not call registry about 6 months ago

I got one last night, and they hung up.

Got a call last night, answered and could hear an open line and then they hung up.