It has been almost six months since Steve Jobs, the world's consummate salesman, introduced its iPhone as the Ronco Veg-O-Matic for the Internet era. Apple disclosed in television commercials Sunday night that the cell phone, Web browser and music player would be released on June 29.

The anticipation -- intense even by Jobsian standards -- has led to some quiet, behind-the-scenes anxiety at Apple. Some Apple executives worry privately that expectations for the one-button phones may be too high and that first-generation buyers will end up disappointed.

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