Ojom which is owned by Verisign (wonder if they have problems with hackers ;-)) has been doing well figuring out the mobile J2ME/Java technology game industry in Europe.

See:

Ojom has J2ME games figured out

Here's a quote:

   The problem can be summed up by simply understanding 
   that most companies developing games for cell phones 
   are trying to copy the console... and are failing in 
   huge ways.  The issues here stretch beyond the 
   wonky hardware interfaces... (which, surprisingly, 
   are designed to be used as phones and not game 
   controllers).   There are issues of technology as 
   well as audience (most people tricking out their 
   mobiles are full-blown adults with a credit card 
   and free time on the commute). Aiming for a Game Boy 
   audience... is not going to move cell phone based games. 

Developers who don't whine and instead make lemonade out of lemons are the ones who do well in the J2ME game industry. Especially ones who know that they shouldn't try to copy a console game to a phone, they shouldn't target kids but instead target adults with money, and they should integrate phone functionality directly into the games. These are critical lessons in creating J2ME game successes.

But, as with all things in life, it's easier to whine than to put in the effort required to succeed.

Hinkmond