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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.
Nokia 5130 XpressMusic: ~65 million
Nokia's 5130 handset was the first music-oriented feature phone out of the Finnish phone maker, and went on to sell in the region of 65 million, based on earlier figures from Nokia. It was particularly popular in emerging markets, thanks to the inclusion of the Opera Mini browser, allowing users to conserve data on the go. But equally, it was popular among Westerners who found the device to be a cheaper 'iPhone' like device — with a mix of high-quality audio and cellular features — albeit without the range of apps, and despite the fact that the iPhone hadn't even been invented by this point.
Image: CNET Asia