Nintendo is currently looking at the business model of Amazon’s "Kindle" as it considers the future for it's own portable consoles. Iwata had this to say on Amazon's example:
“I’m interested because it’s a new business model in which the user doesn’t bear the communications cost.”
"Only people who can pay thousands of yen a month [in mobile phone subscriptions] can be iPhone customers. That doesn't fit Nintendo customers because we make amusement products. In reality, if we did this it would increase the cost of the hardware, and customers would complain about Nintendo putting prices up, but it is one option for the future."