If you no longer have a physical feature phone, you can still read these books using emulators:
: A primary source for bulk downloads of legacy mobile content. You can find large "dumps" of Java applications, including e-books and early mobile software, at Internet Archive . skachat knigi java dlia telefona
: One of the oldest mobile app stores that originally built its reputation on Java content. While it has shifted toward Android, it still maintains a legacy database of Java apps accessible at GetJar . If you no longer have a physical feature
: An open-source pure Java implementation of J2ME that works on various desktop platforms. Modern Alternatives While it has shifted toward Android, it still
: This is the most popular emulator for running .jar files on Android. It allows you to configure screen resolution and keyboard types to match old devices.
For modern smartphones (Android/iOS), the Java .jar format has been replaced by more flexible formats: