Using J2Me in mobile application development...

we can use j2me in mobile application development and it really gives a vast amount of capabilities in development. But big problem comes as we going to test the developed application in the mobile device. The application may not work in the device. This was a real nasty experience i really experienced. There is nothing wrong in the application, but it does not work in the phone just because the way the phone developed is not really supported.
In my experience some of my developed applications did not worked in the some Nokia phones, but the same application worked in a different Nokia phone.
Mobile is a small device and manufactures try to use the memory and the cpu more efficiency and try to give a better specifications and features comparison to their oponents in the market. But the main functionalities does not change. So when we are going to develop an application with more special features it really becomes pretty much difficult as the phone might not really give a real contribution to the running of the application.