The world's first smartphone was created by IBM in 1994. Nicknamed Simon, the smartphone included revolutionary features including a touchscreen, email, and built-in apps including a calculator and a sketch pad.

Cellular phone functionality has continued to improve since then, especially in the years after 2000. By 2007, when Apple released its groundbreaking iPhone, there were already more than 200 million people using 3G around the world.

Here are 11 phones that have not only defined the mobile industry but are also listed among the highest-selling smartphones of all time.


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