2008 Prius Compatibility w/LG Env VX9900 and Env Touch

Can anyone definitively say that the LG Env VX9900 will work with the 2008 Prius w/Nav system? We have one we've gotten to work very intermittently, and are wondering if the phone is faulty. The Prius works perfectly with my Samsung Alias 2. I'd be glad to get a replacement LG Env VX9900, if I can be assured that it will work with the Prius.

Alternatively, does the LG Env Touch work with the 2008 Prius, or is it too new a phone to be compatible? I don't find it on the Toyota.Letstalk compatibility sheet for the 2008 Prius.

Thanks for any help!