Nokia AK-47
Forget iPhones and Droids, the Nokia 1100 is the most important cell phone on the planet. For most of humanity, smart phones are an impractical luxury. Thanks largely to exploding cell-phone markets in Africa and South Asia, the world's most popular phone -- by far -- is the humble Nokia 1100. Introduced in 2003, the 1100 does not do much more than make calls and text. Until networks in the developing world can handle the bandwidth requirements of smart phones, the Nokia 1100 will remain the telecommunications version of the AK-47 -- humanity's most rugged, efficient calling machine.
http://www.foreignpolicy.com/articles/2011/01/02/ideas_the_ak_47_of_the_cell_phone_world
The 1100 has 250 million users worldwide (compare with 73.5 million iPhones) and is destined to see the greatest growth in the market. Something to keep in mind when designing the next revolutionary mobile technology: for true impact on a global scale, it is definitely not going to be an app.
http://www.good.is/post/the-world-s-most-revolutionary-cell-phone/

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