It works like a regular phone, though I'm not sure how'd they charge you. Calling anyone's cellphone will take minutes from them (as always, unless they have weekends free or after 9pm or some sort like that). Calling someone's landlines is usually free. It's the person making the call that gets charged usually. But I'm not sure how'd that work out.

Btw, does anyone have trouble logging into the www.m.grandcentral.com website? It redirects you to www.grandcentral.com/mobile but it won't let me login on my n800 but it lets my laptop and desktop do it. And I really hate using the flash interface, so slow.

Edit: Hmm it works sometimes.. Also oddly now the default internet call app is saying that it can't connect. Proxy01 must be down I guess.

Edit2: Pinged it, it's up.. but for some reason it says authentication failed even when it's right..