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Nokia N70/N72/N73: ~45 million
One of Nokia's first widely available 'smartphone' for the wider market, the Nokia N-series devices were equipped with Symbian 60 and high-resolution cameras (for the time), making these a niche but popular line-up of devices. In 2009, Nokia was selling more than 400 million devices. During this time, N-series phones churned up a significant minority of this overall figure. In one quarter alone, Nokia sold more than 9 million of these phones, making the N-series range one of the more popular ranges on offer.
Image: CNET Asia (N70); Nokia (N72, N73)
Motorola C139: ~60 million
This tiny phone was one of the simplest, easy to use and basic phones on the market. There was nothing particularly good about it by today's standards but it was incredibly cheap to buy and was sturdy in design. It was claimed to be the cheapest unlocked GSM handset on the U.S. market during the mid-2000s.
Apple iPhone 4S: More than 60 million
This was the highly anticipated 'iPhone 5.' After numerous rumors and speculation, those who held out realized there wouldn't be another iPhone for a while jumped at the chance to buy the iPhone 4S, with Apple selling a record four million handsets in the first weekend. There were grumbles, however, that the device wasn't enough of an update to 'wow' the wider consumer market. Then again, they said that about the actual iPhone 5 when that was finally released.