Apple has sold a record 4m of its latest incarnation of the iPhone in its first three days on sale in spite of criticism that the new product was a more limited technological leap forward than its predecessors.
Analysts had expected the company, based in Cupertino, California, to sell between 2m and 4m of the iPhone 4S in the initial rush, compared with 1.7m of the iPhone 4 in three days after its release in the summer of 2010.
The iPhone 4 was greeted with more enthusiasm by critics than the 4S, which has a similar exterior but faster processors, improved camera and a voice-recognition program called Siri.
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