AT&T Says It's 'Testing' Unkillable Tracker On Customers' Smartphones — forbes.com

Phone carriers want to get into the mobile ad delivery business, using what they know about their smartphone-addicted customers to profile them for advertisers to deliver on-the-nose, or rather on-the-finger, ads. Researchers recently took a close look at the privacy toll of carriers Verizon and AT&T AT&T rolling this out: they’re tagging their customers with unique codes that are visible to third parties, making smartphone users far easier to track on the Web than they’ve ever been before. You can see if your smartphone is leaking a unique code on this site. After the findings by researchers, AT&T admitted it’s “testing” a new way of tracking its customers for ad display purposes.

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