J2ME applications

I have many ideas on J2ME new applications, but I would like to understand how many efforts the development for all compatible devices request. I mean: the market of J2ME enabled phones is made up of Motorola, siemens, nokia, samsung devices, with different OS. How many altered (different of the same) applications should we develop to cover the entire market? (e.g. one for nokia and siemens, one for motorola only..) It depends on different models of the same brand too ? Doesa the software modifications regards the GUI only? How may how verify the number of J2ME enabled devices on the market? Are them the same device which uses MMS? I would like to have a clear idea and know more about J2ME market/development Thank you very much. Federico ## Deliverables None at moment ## Platform J2me