I moved across the country and started new classes (three online) before I had net at home. D2 saved my life with blackboard, let me online first day of login to do first forum response. I still got dropped by one teacher, but he was just a pain. Otherwise, I've been happily surprised many times.
Hope it works with Phoenix. You might also try emailing their tech support and ask if the site has any problems with webkit browsers, such as Android (if it works on iPhone, it should work on android).
Droid2 with Fission