Invented by Motorola vice president Martin Cooper in 1973, the mobile phone has gone from a cool, if geeky niche gadget for the wealthy to the most ubiquitous piece of technology in existence. Take a look at the numbers: In 2009, 1.15 billion mobile phones were sold worldwide, and that number is supposed to grow by 35% in the years to come. And it's easy to see how. Nowadays, it seems there's a new mobile phone being released every day, with only a handful of them being good enough to garner good reviews, permeate pop culture, and drum up large consumer interest. We all know which ones those currently are, but what about the phones that reigned supreme in the past? The ones that everyone gravitated towards and made tech journalists go nuts? We decided to take a look back at all the game changers, best sellers, and fan favorites to bring you The 50 Best Mobile Phones of All Time.