About... compatibility
Different generations of i-mode devices in Japan (503i, 504i, 505i) resulted in different generations of i-appli. For example, a game written for the 505i will not run on any of the older devices.

I have a NEC n341i, and I found it to run nothing more than the first generation of i-appli (503i). Downloading a more advanced game is no problem, but trying to run it results in an application error. I expect most of the i-mode devices in Europe to have the same problem. Therefore I did not include any 504i/505i-specific games in the database.