A lot of time and energy is required to build mobile iOS/Android apps. Aside from the coding and UI design you need to plan functionality ahead of time. This way you can start programming immediately and implement key features without a hassle. The best way to start off a mobile application is through wireframing. This is a design process where you lay out each of the app’s views in detail. This could be just a rough sketch, but many designers will spend time going that extra step. Wireframing is all up to your personal decisions and how much pre-planning needs to be done. I’ve gone into some detailed tips below focusing on creative techniques for intuitive wireframe designs.
Source: http://speckyboy.com/2012/02/22/tips-for-wireframing-a-usable-mobile-app-interface/
