You should test your WML services extensively to make sure they are easy to use. Because WML and the UP.Link platform support a wide array of devices, it is important to test your services with the "least common denominator" device--the device with the smallest display. The "least common denominator" device is currently the Mitsubishi phone. For information about configuring the UP.Simulator to emulate a Mitsubishi phone, see the UP.SDK Tools and APIs Guide.