The Store Is Tracking Your iPhone

The Store Is Tracking Your iPhone
SAN FRANCISCO, CA - OCTOBER 14: An Apple Store customer looks at the new Apple iPhone 4Gs on October 14, 2011 in San Francisco, United States. The new iPhone 4Gs went on sale today and features a faster dual-core A5 chip, an 8MP camera that shoots 1080p HD video, and a voice assistant program. (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO, CA - OCTOBER 14: An Apple Store customer looks at the new Apple iPhone 4Gs on October 14, 2011 in San Francisco, United States. The new iPhone 4Gs went on sale today and features a faster dual-core A5 chip, an 8MP camera that shoots 1080p HD video, and a voice assistant program. (Photo by Justin Sullivan/Getty Images)

Like dozens of other brick-and-mortar retailers, Nordstrom wanted to learn more about its customers -- how many came through the doors, how many were repeat visitors -- the kind of information that e-commerce sites like Amazon have in spades.

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