What the heck could this mean?

I went on a job interview today. After I was finished there, I stopped and got gas and headed home. As I was driving down the highway, my phone rang.

I answered the phone and said, hello...hello...hello.

Never did get a reply and then the call ended. So I figured that I may have just lost the call because of the hilly nature of the highway. As soon as I got in an area where the highway straightened out I tried the number back.

Then I got a recording saying, "we're sorry but the number you have called has been disconnected..."

It was less than 5 minutes after I had gotten the original call and it's disconnected.

What the heck is that?

Oh and if you want to verify this number yourself, here it is. 202-599-9723