Phone Firms Sell Data on Customers

Big phone companies have begun to sell the vast troves of data they gather about their subscribers’ locations, travels and Web-browsing habits.

The information provides a powerful tool for marketers but raises new privacy concerns. Even as Americans browsing the Internet grow more accustomed to having every move tracked, combining that information with a detailed accounting of their movements in the real world has long been considered particularly sensitive.

By ANTON TROIANOVSKI

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