Motorola RAZR cellphone (AP Photo/Lisa Poole, file)

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Units sold: 110 million

Before smartphones became the norm, there was one mobile that ruled the cell phone world; it was super-thin, it was super-sleek and it sold like crazy. Indeed, the RAZR enjoyed a run only a few consumer gadgets in history can relate to, selling more than 100 million phones in just a four year span. Motorola's phone, which hit store shelves under a total of three different models, would be muscled out by the iPhones and BlackBerries of the market, but it wasn't without its day in the sun. In addition to breakneck sales, the RAZR was also named by PC World in 2005 as the 12th best gadget of the previous 50 years.

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