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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.