But her BlackBerry serves up her work email messages very fast, Ms. Slavin says.

WSJ: Double Mobile-Phone Users Like iPhone for Image, BlackBerry for Email

Ms. Slavin uses it for phone calls, text messages, her personal Gmail account and Web browsing.

WSJ: Double Mobile-Phone Users Like iPhone for Image, BlackBerry for Email

"There is a huge amount of customer dissatisfaction, " says Marc Slavin, a deputy city attorney for San Francisco.

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In fact, says Laurence Slavin, a medical accountant, the average score is 950.

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"We have a lot of rules that you can set up to let these things happen automatically, " adds Alison Slavin, one of the company's co-founders.

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Amanda Slavin, the 26-year-old director of marketing and events for a New York restaurant group, is used to getting skeptical looks when she pulls out her BlackBerry.

WSJ: Double Mobile-Phone Users Like iPhone for Image, BlackBerry for Email

On a sweltering afternoon in March, Eoin Slavin, an executive at Rio-based development firm Landis, wandered the mostly forgotten working-class neighborhoods in the shadow of the elevated highway searching for prospects.

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