Strategy Analytics estimated Samsung sold 18 million S3 models in the third quarter, compared with iPhone 4S sales of 16.2 million.
Strong sales of the flagship Galaxy S3 - which comes with a large 4.8 inch touchscreen - helped Samsung post a record $7.3 billion operating profit in the July-September quarter.
"Samsung's Galaxy S3 has proven wildly popular with consumers and operators across North America, Europe and Asia," said analyst Neil Mawston, adding the new iPhone 5 would likely reclaim the top spot for Apple in the current quarter.
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