No Kindle App for Your Symbian Phone? Try this FBReader
FBReader is now available for almost all Nokia phones. In fact they have versions for not only Symbian and MeeGo, they also have versions for Maemo. If you want to use it on a non Nokia phone they have versions for Android, Mac, etc…
While you will not be able to get titles like you would for the Kindle there is a large selection of books available for this app. The app supports ePub, the most widely supported open format for eBooks.
If you want to download it and try it out for yourself you can download it here.