AT&T Stops Using ‘Perma-Cookies’ to Track Customer Web Activity

In late October, researchers discovered that AT&T and Verizon had been engaging in some unsavory customer tracking methods, using unique identifying numbers or “perma-cookies” to track the websites that customers visited on their cellular devices to deliver target advertisements. See my earlier article at for details.

Following significant negative attention from the media, AT&T has now told the Associated Press that it is no longer injecting the hidden web tracking codes into the data sent from its customers’ devices.

The Associated press story says:

The change by AT&T essentially removes a hidden string of letters and numbers that are passed along to websites that a consumer visits. It can be used to track subscribers across the Internet, a lucrative data-mining opportunity for advertisers that could still reveal users’ identities based on their browsing habits.

You can read more in the AP story at

Verizon Wireless said Friday it still uses this type of tracking, known as “super cookies.”

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