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HTC Thunderbolt: ~16 million
Sales soared due to the excitement during the run-up to the device's launch, so much so that it broke record sales of one phone vendor. Wirefly reported that sales were 400 percent higher than any other pre-sale device. In just two weeks, Verizon sold 260,000 units.
Though it was rumored the device was selling faster than Apple's iPhone -- a rumor that was subsequently squashed -- but the HTC smartphone is believed to have sold 15 million units by the end of 2011, with another million during the last calendar year.
Credit: Sarah Tew/CNET