WordPress has a wonderfull iphone app to manage ur wp blogs straight from your iphone.
While using the wp iphone app i tried checking the stats of my blog but it displayed “no stats to display”
However this is not something to worry if you are having sikilar error on ur wp app for ios. You just need to wait for a while on the same screen and it will load.
The issue is probably that the stats aren’t showing “loading” or something like that, instead it simply says no stats to display.