In this ten minute talk at Le Web 3, which you can see on video, Ahtisaari first discusses the history and the scale of the development of mobile devices over the last ten, fifteen years, with a particular focus on the changing social role of the phone.
He then points out “a few challenges that are opportunities for finding new growth,” where again he focus on the social role. They are in short “reach, sometimes off, hackability, social primitives and freedom.”
To understand more of what this mean, I suggest you watch his talk, although I can point out a few lines: “We are not doing a good job of designing the experienced of tuning out of communication. [...] We can do better at designing the tuning out experience, so that we can be present physically and then again in the flow of communication.”
(All other conference presentations can also be viewed on vpod.tv.)