Well, there are 7.05 Billion of us, according to various sources. According to indexmundi 26% are under 14 years old. and 8% are over 65. So lets call that a potential world market of 7.05 * 0.66 = 4.65 Billion economicaly active adults. 
The suggestion is therefore that 23% of the adults in the world have a smart phone. Wow. And if it /does/ double, as they suggest, that will be getting on for half of us. 
I wonder what else has achieved market penetration like that? The ball point pen, perhaps. Certainly the knife. Shoes. If you include plain phone phones, how close to 100% do we get?
http://www.itu.int/ITU-D/ict/facts/2011/material/ICTFactsFigures2011.pdf says there are 6 billion mobile phone subscriptions, that's 87% of the whole world population and 129% of my rough-and-ready count of world adults.
Now, look. This is something done by Science, not religion or governments. It has changed the world very profoundly, which is what technology has done since the stone age. religion and government is dedicated to the status quo, Engineers to tearing it down. I rather think I know who is winning.
 I am aware that in some countries schoolkids have smartphones.
 But not me.