We have recently added iPhone and Android support through several popular apps.
Tapatalk - ($2.99) from Android Marketplace, and also ($2.99) from the App Store for iPhone/iPad.
ForumTouch - (Free) from Android Marketplace. Not sure if also offered for iPhone/iPad.
TouchBB - ($0.99) from the App Store for iPhone/iPad only.
For more information and/or support, please review this thread first and post all comments to the Technical Problems & Questions forum.