Given that there are many sizes and color depths for different phones (even for the same manufacturer), i would like to have one application for all of them and then, download a proper icon for the phone de app is downloaded into.
Is there a way to change the MIDLet icon once the application is downloaded?
As far as I know there is no way of doing this. You can however force the user to upgrade an app and change the icon then. This can be done in a more user friendly manner without loss of content downloaded by app.