Eventually the entire phone service model will be flipped: everything will run on IP instead of the old "POTS" way or the hodge-podge we have now. Nokia would be crazy (as a corporate entity) not to get ready for that.
If they (carriers) haven't understood that eventuality by now, then they deserve to lose business IMO. But it sure does seem like the Big 2 (in the US) don't get it yet, doesn't it?
A device that is connected to a data only connection using a SIP for telephony interface and built on a largely open source platform has the ability to take carriers completely out of the mix, though will make backhaul and internet service providers feel even more like the utilities they are but aren't acting like. This is disruptive technology at its finest.