The forum seems to work perfectly fine for me on my iPhone. Is there something that's not working on your mobile device? I'm just going to forum.atu2.com in the browser and it's great.
The iPhone/Android app is what it is and won't change in the future. Here's why: Developing good apps is really expensive, like on the order of 5-figures. Needless to say, we don't have that money. About 5-10 readers per year ever make a donation via the Paypal button on the site and we have no ads, no other income. So getting a cool, world-class app just isn't gonna happen when your annual income is about $200.
Now, if more of you want to contribute on a regular basis, or if we decide to put ads on the site (and our readers accept them), then maybe we have some flexibility to do some cool things that require money. But I doubt that's gonna happen anytime soon. We've talked about putting ads here in the forum, and we may do that in the future, but it's not been a high priority.
So that's where we are. Trust me ... our internal wish list is a mile longer than anything that's been mentioned here, but we really can't do much as a non-monetized website.