Nintendo representatives going as high up as Reggie Fils-Aime himself have spoken about the possibility of the company developing a mobile phone, but nothing has ever come to light. A recent report by Pocket Gamer, however, discovered that not only did the company seriously look into producing a handset, it worked with mobile giant Nokia to produce a concept.
A small research and development team from both companies worked together less than ten years ago to investigate the possibility of a Nintendo phone. The team emerged with a concept that was taken to the board of directors, but the idea was rejected and the development team dissolved.
It's difficult to imagine Nintendo having another stab at the world of mobile phones when rumours its 3DS system could contain 3G support persist, but had the directors felt differently we could all be carrying Nintendo phones in our pockets.