I think there is a JB app called Anyring, havent used it.

Thing for me is the iphone will be the perfect phone and smartphone in the next version of it (I am assuming flash camera and hi res/cpu upgrade etc).

But it will never be a computer running GIMP etc I don't thing the n900 is particularly good at either being a phone, smartphone or computer from what I have read but the potential is there once software is added and optimised. Or perhaps it will occur with the next generation of meego devices.