Hi, Lately I've had some problems with installing applications. When I install an application the progress bar jumps back and forwards until i get the messaige "Unable to Download application". "<Application name> will be available for download why you log in to the iTunes Store on your computer". The error only appears when downloading apps on 3G-network. WiFi works fine. I've tried to connect the iPhone to iTunes, recover it a couple of times but the error stil occurs. I'm using carrier OneCall Norway with an iPhone 3G bought from NetCom. And it's not jailbroken. Is there a fix for this problem? Will 3.1 do the thing?