(keitai-l) SPAM on mobile networks still an issue ?

Folks,

I am doing some research work on the occurence of general unsolicited 
messages in various media (aka SPAM).  Up to late last year there was 
a lot of discussion on the topic of spam in mobile networks such as 
DoCoMo, AU/KDDI and J-Phone.  As I do not live in Japan I would be 
curious to know if this is still a major problem and what the 
providers are doing against it.

I would be especially curious to know what the type of spam is that 
you typically encounter (and how it has changed over time).

I appreciate that a discussion like this is probably off-topic for 
this list and would be more than happy with direct e-mail responses.

Thanks,
Marc

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Marc Sheldon
Bond University
Gold Coast, Australia