No, I mean the Google Talk mobile app allows you to make voice and video calls. I'm not talking about calling phones, I mean you can call other Google Talk users. You can of course use Google Voice on Android to make international phone calls if you want, as well.
You should be able to call any XMPP (Jabber) users if their server is federated (and they have a client with XMPP/Jingle support of course). I.e. not only to the users of Google's XMPP server.
I don't see what your point is. This conversation was never about phone calls in the first place. It was about VOIP to VOIP calls, which are of course completely free and unlimited to anywhere in the world if you use Google Talk.
