I used it for about a month strictly as a portable computer and skype phone only over wifi. Maps and GPS don't seem to function without cell service though I think. Its really odd to be making phone calls on it without any cell service at all. I loved it.

only reason I went for a t-mobile plan was for ovi maps, 3G skype calls from anywhere, and to side-step my company's filtered Internet connection. I don't use it with talk/texting plan. Only got a data plan on it. 3G makes it just more of a portable connected device. But its awesome as a wifi-only computer too.