I have a sidekick lx 09 and nothing works now. Help!!?

I just got a sidekick lx 2009 in September and my dad is still paying for the full unlimited data plan for this phone and facebook, the Internet, YouTube, etc. And nothing works! I can still text and call but that's it. I need to change the APN because hiptop no longer works. Tmobile shut it down due to the release of the new android powered sidekick 4G. Please help!