iOS iPhone App doesn't load on 2g

Hi
I've got an iPhone app that has the majority of content stored on the device. The app loads an external HTML file in a modal view. When the phone is on Wifi, that page loads fine, in less than a second. However, when I'm on 2/3g, the page doesn't load ever - I've left it for 5 minutes and still nothing.

I'm sure there's something I'm missing in Xcode - "app requires cellular data" or something like that. Any ideas anyone?

Thanks,
Sam

Of interest - when I change the loading page to google.com, the app takes you there (slowly, as on 2g). I wonder if it has something to do with the initial page it loads being stored on the device - maybe a local page can't load a remote file?

Sam