Apple 2.0

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Chart: Apple's U.S. smartphone share doubled in September

October 21, 2013: 7:07 AM ET

Last month's bestsellers: 1) iPhone 5S, 2) Samsung Galaxy S4, 3) iPhone 5C.

Source: Counterpoint's Monthly Market Pulse. Click to enlarge.

Source: Monthly Market Pulse. Click to enlarge.

FORTUNE -- Driven by the iPhone 5S and 5C, Apple's (AAPL) share of U.S. sales surged in September to 39% of the smartphone market and 34% of the broader mobile phone market, according to a report issued Monday by Seoul-based Counterpoint Research.

"In spite of supply constraints and just three weeks of sales, iPhone 5s raced to become the bestselling smartphone model in the US in September," said Counterpoint research director Tom Kang. "The key reason for this sudden jump in sales can be attributed to the big wave of upgrades due in this launch month from Apple's huge installed base of iPhone users in US. This depicts a healthy replacement cycle and user base growth trends for Apple despite the array of Android devices launching from tens of OEMs every month."

Counterpoint's press release did not describe the survey's methodology.

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Philip Elmer-Dewitt
Philip Elmer-DeWitt
Editor, Apple 2.0, Fortune

Philip Elmer-DeWitt has been following Apple since 1982, first for Time Magazine, and now on the Web for

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