Honkeytonk Monkey on 20 April 2009
Nintendo could easily build something like this, have it work with the Wii, Include channels much like Apple's Aps. They could also incorporate the Wii Speak channel so that you could make calls between your DS and thw Wii.
The CHannel setup from the Wii would work perfectly for a phone, channels like weather, photo, shop, etc, also lend themsleves perfectly to a cell phone.
While open you could keep playing while talking on the phone using the Mic and speakers. 
I would be willing to bet it could be built and sold for much less than an iphone goes for after Apple tax. Having an SD slot, the DS already has the capability of being an MP3 storage device as well. Something like this would eat a giant chunk out of the mobile market.
