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Can i use OpegnGL ES for EVERY mobile device(nokia n-gage...)

No. In fact I don't think there are any devices available at general retail that support GLES, but they are coming soon now (like within the next few months I belive).

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If i want to program graphical applications for mobile devices should i better use java 3d for embedded systems

Whilst a lot of mobile devices support J2ME (Java 2: Mobile Edition), they generally dont support any 3d capabilities.

What you need to understand is that most phones have processors that run at speeds of 50Mhz and under, with tiny amounts of memory (think KB, not MB). There just isn't the processor power available to do proper 3d on most phones. Unless you only want to target very high end phones I suggest you stay away from 3d for comercial apps for now. In a year or so I suspect we will start to see a few commercially available phones with decent 3d support, but untill then any 3d would have to be completly software renderered (and just to make things even more fun, most phones have no floating point math support).

Alan

The n-gage is kind of a special case as it was always designed to be a games machine as well as a phone handset. As fasr as I am aware the k700i doesn't have any special 3d capabilities.

To clarify what I meant, there are games out there now that have a 3d look, in the same manner that some NES games looked 3d. They are not true 3d in the sense of quake style textured polygons, which is also what I was talking about when I was saying this would probably be available soon.

There are some handsets/manufacturers that provide various polygon draw routines, but these are entirly implemented in software, and in my experience, are slow and not suitable for building a full game from.

Alan