Millions of people in the United States have mobile phones, and we’ve had them for years. We may upgrade phones or change plans, but cell phones and plans are generally sold to people who alread
China may be the biggest of all when it comes to the sheer volume of users in its mobile market -- <a target="_blank" href="http://ben-evans.com/benedictevans/2014/3/12/700m-smartphones-tablets-in-chi