This document summarizes a presentation on developing and testing Java mobile applications across different devices. It discusses developing a simple application to perform network connections and store response codes, testing it using emulators and tools, and then deploying it to actual devices like the Sharp GX20, Nokia 6630, and Motorola V980. It finds issues like RMS storage limitations and attribute naming issues that require changes to make the application work across all devices tested. The key takeaway is that the "Write Once, Test Anywhere, Work Around" paradigm is important for Java mobile development.