Yes, there has been a DIS app available on the iPhone for a while. If you look at the tech board, you will see there is an (unofficial) app for Android now too
This new DISboards app only came out yesterday actually. I quite like it but will take a bit of time to get used to as I didn't mind using safari for the boards
It's just easier, it's designed to work with the limited keyboard and screen size of your mobile device, the buttons etc are all optimized for mobile use, I find it much easier and much faster
I just got the Android version and am posting from it now. It's definitely one of the better apps I've got and very user friendly. I love the subscriptions bit.