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Motorola Droid Bionic: ~13 million
Motorola's delayed touch-screen smartphone got off to a bad start, after delays and some owners complaining of audio troubles when it was eventually released. Still, sales shot through the roof after just a few months. It's estimated that 13 million Droid Bionic smartphones in two years. However, sales could've been better if the device wasn't locked into a Verizon exclusive deal in the U.S. market, but those who did buy it were able to use the carrier's 4G LTE network.
Credit: Motorola (via CNET)