Sorry guys but Nokia plays this "game" more clever than Siemens.
Nokia have a huge Developers forum of about 1.500.000 J2ME (Java) developers...!!
Extremely beautiful Developer Platforms, Many SDKs for every phone model, Very useful developer's tools (Nokia Developer Suite), Emulators not only for mobile phones but also for
WAP Gateways, MMS Gateway/Servers etc....
And especially for Game development Nokia supports in all their java enabled phones the Nokia UI
API so you could have Full Screen games that in Siemens phones I think you can't.
So the reasons are so obvious.
gpalouk.