Kephyr's MobileBook requires a Java/Midlet aware device, supporting MIDP 1.0. MobileBook has been tested on a SonyEricsson T610 and the emulators in Sun's Wireless Toolkit 1.04/2.2. You are free to re-distribute the unmodified midlets created by this service. Try our test-MobileBook:
mobilebook.jar mobilebook.jad. MobileBook version is 0.1a.