Apple's Latest iPhone Models Go On Sale Across U.S.

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Apple CEO Tim Cook looks on at an Apple Store on September 20, 2013... News PhotoApple Store,Business,California,Corporate Business,Finance,Horizontal,Looking,Merchandise,Palo Alto,Retail,Technology,Tim Cook - Business Executive,USAPhotographer Collection: Getty Images News 2013 Getty ImagesPALO ALTO, CA - SEPTEMBER 20: Apple CEO Tim Cook looks on at an Apple Store on September 20, 2013 in Palo Alto, California. Apple launched two new models of iPhone: the iPhone 5S, which is preceded by the iPhone 5, and a cheaper, paired down version, the iPhone 5C. The phones come with a new operating system. (Photo by Justin Sullivan/Getty Images)