Phones and Emulators
When it comes time to test your applications, you can use either a phone or an emulator that simulates the phone's behavior on your computer.
If your applications are intended for public use, you will want to test your applications on as many WAP devices (or their emulators) as you can. Just as a Web developer should test HTML documents on various browsers and computers, you should test WML documents on as many devices and browsers as possible. Because of the variety of manufacturers, the differences between the output on two WML browsers will be much greater than the differences between the output for two HTML browsers.
Phone output displays vary depending on their physical capabilities and the browser they are running. ...