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Apple iPhone 4: More than 50 million
Sporting a brand new design, Apple is estimated to have sold more than 50 million iPhone 4 handsets since it was first released in June 2010. With 1.7 million iPhone 4 handsets sold in just three days of availability, sales were boosted by the December holiday quarter. It remains on sale even today, three years later, adding to its continued success.
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.