Highly recommended for S60 devices like the N97. It supports MOBI and PalmDOC formats. You can download it from the Mobipocket mobile site.
Downloading and reading books on Nokia devices depends heavily on whether you are using a classic Java/Symbian model or a modern Nokia Android smartphone. For Classic Nokia Phones (S40, S60, Symbian) knigi dlia nokia skachat
Offers thousands of free classics. If a file is too large for your phone, some versions allow splitting books into smaller 64KB or 128KB chunks. Highly recommended for S60 devices like the N97
An open-source reader that handles multiple formats including EPUB and FB2. Where to Download Books: Downloading and reading books on Nokia devices depends
A massive library of over 75,000 public domain titles.
A popular source for downloading Java-based (.jar) book apps directly. For Modern Nokia Android Phones Mobipocket and eBooks on the Nokia N97 - All About Symbian
Older Nokia devices typically use (Java) or SIS (Symbian) files for applications and simple text or specialized formats for books. Top Reader Apps: