Nintendo should make a smartphone

I’m looking at this:

…and I’m thinking: yes. Yes I want this. I’m also thinking: stick a sim card in there!

Why Nintendo hasn’t explored the avenue of a gaming-centric smartphone?

Of course it’s been tried before by others with poor results (remember the Ngage?), but of all the companies that could produce the hardware and software tie-up to make it happen, it must surely be Nintendo. It would be so fun.