I think he means that his buttons don't work and he wants to replace the contacts thats on the bottom of the screen(in the interface) with a Phone.
What Windows Version are you using and are you using standard UI or HTC home/etc?
aka those buttons are part of the UI..you can easily get a UI that replaces them like this:
I have not tested this UI myself, it just a UI ive seen that seems to be doing what you want
http://www.kennethbrandon.com/projec...-today-screen/
If you are using HTC Home, then maybe the "HTC Home Customizer" will work
http://www.freewarepocketpc.net/ppc-...izer-v1-0.html