Pointing to the smartphone, Kurzweil says, devices like the iPhone are 100,000 times smaller than the computer that he used as an MIT student. "It is also several thousand times more powerful," he says. "It is a million times cheaper. That is a several billion-fold increase in price performance." Technology is being reduced at a rate of "100,000 in 3-D volume per decade," says Kurzweil. "That is another predictable exponential trajectory, so computers of this capability will be blood-cell size in 2030.
Phone size is increasing again.
30 Years Of Cell Phones

Yeah but the bigger screen phones are mainly for people that want bigger phones...I think to a certain extent we will see phones start to turn in to wearables next, but people are still going to want a screen... also "devices like the iPhone are 100,000 times smaller than the computer that he used as an MIT student" cannot be overlooked or understated, it is quite profound in its implications if the trend we have seen in tech continues ....
then how about virtual reality direct to your senses.. mindboggling