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It's baaaaaaaack. After falling behind Samsung's popular Galaxy S III for the last month or two, the iPhone surged to the top of U.S. sales in September even though it was only on sale for the last full week of the month.

Our image gallery breaks down the top three at all of America's top four wireless carriers — Verizon Wireless, AT&T, Sprint and T-Mobile.

Rankings come via retail checks made by analysts at Canaccord Genuity.

Missed last month's list? Click here for the hottest selling smartphones at U.S. carriers in August.