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Nokia 2600: ~135 million
The Finnish phone maker sold around 135 million Nokia 2600 series handsets from 2004 when the device first went on sale. A relatively unremarkable phone, it was one of the first handset series' by the company to feature a color display, though did not include a camera.
This kept the cost down and made it hugely popular thanks to its low price tag. Incremental updates in the 2610, 2626 and the 2630 handsets had additional hardware capabilities and functionality, spanning the range of many wallet sizes even for smaller, less-viable economies.
Nokia 3310/3330: ~126 million
One of the most robust phones of our times — even memes have been created around the strength of the device — the Nokia 3310 remains one of the most well-known devices on the planet. An estimated 136 million Nokia 3310 and 3330 handsets have been sold since the phone first launched just before Christmas 2000. By 2005, there were 126 million units, which was more than the 100 million phones sold by Nokia between 1991 and 1998.
Interestingly, if all the Nokia 3310 and 3330 phones were laid end-to-end, it would stretch from Helsinki, Finland to Santiago, Chile, according to the phone maker.
Nokia 1100: More than 220 million
Surprise, surprise, a Nokia wins the top spot. The Nokia 1100 may look unceremonially brick-like but its basic features have helped the Finnish phone maker reach global success with this basic, monochrome display phone. Perfect for those on a shoestring budget, it doesn't have a camera or email, let alone a color display, but it sold — thanks to its extremely low price — more than 220 million devices by estimates. Launched in 2003, it may not have reached the cumulative success of Apple's iPhone, which has sold more than 300 million, but it surpasses every iPhone iteration by a long shot.