Best Buy will be the first national retailer to sell Apple's iPhone in the United States in a partnership that could help drive sales of a device expected to be one of the hottest gadgets this holiday season.

Best Buy, the leading U.S. electronics chain, will announce on Wednesday that it will sell Apple's newly launched 3G iPhone, which lets users connect to the Web at high speeds, at its 970 U.S. stores beginning on Sept. 7.

About 600 stores will also showcase the handset, priced at $199 to $299, in their Apple  mini-shops. Stand-alone Best Buy Mobile shops, which have opened in about 15 U.S. cities, will also sell the device, which requires a two-year contract with carrier AT&T to operate.

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