I had something like this happen to me on T-Mobile a couple weeks ago. A mother and daughter were trying to call each other one night, and each call went to me. It went on for over an hour. I even tried to call their numbers back and got my voicemail.

I'm on firmware 1.0 and TC4-RC29 and it works. That's kind of scary... Especially because I SSH'd into a friend's server and wrote out rm -rf / ... just to be funny ... I didn't hit enter of course but if I did...