(keitai-l) net/phone statistics

Anyone know of a (free) site that lists stats on total computer and mobile 
phone users in Japan, what they use them for, age groups etc.
I know its been talked about before, but I cant seem to locate the address.
The one I did find was specific to i-mode.
The May J@pan Inc. also lists some info, but nothing about email use, voice, 
net, etc.

Thanks,

David
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