How to upgrade your Nokia N80 to Nokia N80 Internet Edition (for free)
It is now possible, using official Nokia software, to upgrade most Nokia N80s to Nokia N80 Internet Edition. This irons out many bugs and gives your phone a whole host of new features, including the ability to run Truphone.
You can discuss this on the mobile voip forum
Information from source: http://www.truphone.com/scn/blog/blog.tru?entry=how_to_upgrade_your_nokia