For such information, ask Docomo, not IETF.
There is no Docomo service in my area.
Or, are you spamming IETF acting as a sales agent of Docomo?
No, I'm not affiliated with any part of the cellphone business.
I ask because my employer and I have multiple, specific applications
for cellphone-based email with MIME audio attachments.
There are many companies who -- if you believe their announcements
-- are so close, but they seem to be throwing good money after bad,
on dead-end technologies like WAP.
Cheers,
James