First draft of the introduction

Rewrote the introduction as a usecase.

Pulled the introduction into a separate file.

This is a first draft but thought I'd get out a general idea of the introduction I had out as soon as possible.
How are they common, in what way? and they are not all over the world, yet. Perhaps: 
"With over 1.5 billion smartphone users all over the world, and over 80% of the population in developed nations that have mobile broadband subscriptions, these mobile devices have become extremely popular and have become part of our daily lives."

sources; 
http://www.emarketer.com/Article/Smartphone-Users-Worldwide-Will-Total-175-Billion-2014/1010536
http://mobiforge.com/research-analysis/global-mobile-statistics-2014-part-a-mobile-subscribers-handset-market-share-mobile-operators