iPhone port of Android app

We have an Android app currently in beta test, and need an iPhone version of the same. The UI consists of 8 different screens, most very simple. The server-side API is very well defined - REST calls returning XML. I will provide screen shots of the Android version, a detailed application flow, renders of all the images to your specifications, and documentation on the server API. The app uses Google Maps, the local contact database, and a custom-built but pretty simple push service. I can also provide the Android source for the XML parsing and push service handling to jump start those pieces if it will help. You will be required to sign an NDA before starting. The first milestone will be to provide a static layout of all screens, using images I will provide rendered to your spec (size and format). The second milestone will be a working version of the app for alpha testing. The third milestone will be the final, completed version of the app.