Iphone app crashing on xcode simulator with default blue screen

Alright, I have started to prototype a game that I am going to put on the iphone, but I am having trouble just getting the default blue screen to appear. Even if I build and run with just the blue unity screen with the iphone simulator, it appears to load, but after about 3 seconds, it quits out of the app. If I try and download it to my ipod, it says "unity-iphone failed with status 1". I really like unity, how can I get my app to load on my ipod? Thanks for any help.

As Jessy said. Also make sure you build for Debug, put lots of Debug.Log statements around your code, and use the XCode Console GDC to see what's coming out of the phone (it's a lot like Unity's error console window in that respect)