Nokia researcher Jan Chipchase's investigation into the ways we interact with technology has led him from the villages of Uganda to the insides of our pockets. Along the way, he's made some unexpected discoveries: about the novel ways illiterate people interface with their cellphones, or the role the cellphone can sometimes play in commerce, or the deep emotional bonds we all seem to share with our phones. And watch for his surefire trick to keep you from misplacing your keys.