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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.