According to a report by the World Bank, three-quarters of the world population now has access to a mobile phone. At the rate this is going, it is predicted that by 2015, there will be more phones than there are human beings.
Even at the height of landline subscriptions there were "only" about one billion globally, and it took more than a century to get there. Of course, mobile and landlines require different infrastructure and most people did not have an individual landline but rather a household one. But even taking those differences into account, the spread of mobile is representative of a globalized economy in which new technologies can spread farther and faster than ever before.
Also, in contrast with landlines, mobile tech is not only a telephone but a broader multimedia device (just how broad depends on the phone). In particular, consider text messaging. Nearly five trillion (that's trillion, with a "tr") text messages were sent in 2010, more than 12 million per day. Mobile Internet use lags behind but is growing as more capable smartphones become cheaper and more widely available.
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