Indeed the only difference between the iPhone and any DoCoMo phone is afaik the fact, that the Japanese phones will check the IMSI far more often.
Actually, to get the StealthSIM work with DoCoMo or Softbank or AU, we'd "only" have to
a) know under what circumstances our Japanese phone checks the IMSI
b) and then modify the program source code of the StealthSIM application to suit our phones needs.
While a) should be not too difficult to find out, the b) part shouldn't be too easy though. I have no idea how to do this actually... I tried to understand this hack concerning the iPhone, but without proper programming skills it may not be done. On the other hand, I'm quite sure there are lots of people out there who could do this. Maybe the people from hackint0sh could help? In case the StealthSIM company really can't be convinced... But anyway I'm gonna mail them again!
I seriously thought about opening a petition for that and sending a bunch of signatures to StealthSIM then.

Of course our Japanese phones are not as popular as the iPhone because nobody ever forced a hype like Apple did. So the community of Japanese-cellphone-lovers is not as famous as the iPhone lobby, but it's definitely true that the StealthSIM company could make a fortune by investing the time and money for this hack! People would pay A LOT of money if this hack would work properly!
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