You won’t be playing Super mario on a phone anytime soon. Nintendo has said that it isn’t planning to build a phone or license its games for third-party software platforms. They are going to focus on consoles and handhelds.
The high costs involved in cellular carrier partnerships are the main roadblock. That would affect the price of games. It just isn’t something Nintendo is looking at right now, but who knows? Maybe down the road, we will get a Nintendo phone. Just not now.