Strange thing is, the log and DC error massage shows "https://www.google.com/voice/m is not accessible" but if you manually access this page via built-in web browser I can access this page without this problem under 3g with The Onion Router enabled.

So why DC and TOR cannot acceess this GV page while you can access it via browser? Only because browser has proxy support (I cannot remember I explicitly set proxy for browser though) ?