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Roseanna DeMaria, an attorney with AT&T, has organized an increasingly successful campaign to thwart cellular-phone fraud. Cellular fraud had become a significant threat to wireless services, with bandits using scanners to capture telephone code numbers and using them for billing. Meanwhile, law enforcement officials, busy with other, seemingly more important concerns, tended to downplay the problem's importance. DeMaria, who formerly oversaw narcotics prosecutions for the New York City district attorney's office, disagreed. When she joined AT&T Wireless Services, in 1994, she set out to alert responsible officials to the fact that large-scale criminal enterprises, such as drug cartels, were using stolen numbers as a way to maintain their anonymity.