BOSTON - Nisha Taylor was just about to put her beloved T-Mobile Sidekick in her bag. She thought the cell phone would be safer there than in her pocket. In the few seconds it took for the 18-year-old to unwind the string loop that held the Sidekick to her wrist, someone else eyed the device and made off with it.

"He just runs and he hits the phone," Taylor said. "The string pops. The phone goes up in the air. He catches it and he runs."

Although the Sidekicks — which have flashy flip screens and the youthful cachet of endorsements by rapper Snoop Dogg and basketball star Dwyane Wade — aren't among the country's best-selling phones, they might be the most stolen ones.

Boston police reported more than 300 stolen Sidekicks in 2008, accounting for 14 percent of all robberies in the city. New York City saw a 59 percent surge in subway robberies in December compared with the previous year, driven largely by thieves targeting high-end cell phones, especially the Sidekick.

And Adrian Portlock, whose company Checkmend.com tracks stolen cell phones, ranks the phone among the most-taken worldwide, even though the Sidekick's primary market is the United States, where it is available for $100 after a rebate.

Thieves have long targeted trendy items, from Air Jordans and Starter jackets to iPods and GPS units. But the Sidekick is not ubiquitous — it has never cracked the list of the five top-selling cell phones since the consumer research firm NPD Group began the ranking in 2005. Instead, thieves target Sidekicks because of their urban hipness quotient, and because they're easy to resell.

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