Tried it on a Sanyo SCP-4900 with Sprint Vision service. I was able to log on and look up a travel bug. However, all other options (View cache, Find Cache, Log Cache) resulted only in "plug-in not available, download?" with a YES, NO choice. I choose yes, and it took me to a general purpose download page offering a "Jessica in bikini" screen saver.
Should I need to download anything?