The W850I is a smartphone from Sony-ericsson. It supports a variety of novels, including: 1 TMT format: This is a simple text format suitable for storing short text messages. <strong></strong></strong><strong></strong> 3. The browser: This is a format used to create e-books. It allows e-books to have more complex forms and styles. 4 UMD format: This is a format created specifically for e-books, which has an intuitive content and a customized page layout. 5. JAR-format: This is a format for the application of a java-based application that can be run on a java-based virtual machine (jvm-based). In addition, the cell phone could also download novels in other forms such as JAR, pid, and Kindle.