Interesting. The big untapped markets seem to be the developing countries that have some of wireless infrastructure in place but people can't afford a $100-$200 mobile phone. Samsung and Apple are going to have to react or leave the door open to other players.
But anecdotally I am hearing that the tide is starting to turn against prestige brands because of the massive sales of entry-level and medium-level smartphones and tablets in the developing world.
In essence we are getting to the point where everyone who can afford and wants an iPhone or Galaxy S has been sold one. The people left who haven't been sold one but want one find it hard to justify the cost but ARE buying lower priced alternatives.