How to design a mobile application
blog.aparicio.org
blog.aparicio.org
The idea in the post is to play with the design, in the device, for a while, and get design feedback much earlier than when you give the app to a developer.
I'd try to get it displayed on the actual device as early as possible on way or another.
What came as a breakthrough for me was to actually mix screenshots and statically implemented screens in a real mobile app, then play a lot with that.