AT&T told the Associated Press on Friday that it is no longer using permanent cookies to track its subscribers. In late October, security researchers discovered that the carrier, along with its competitor Verizon, were using unique identifying numbers or "perma-cookies" to track their customers online habits.
A spokesperson for AT&T said that the tracking practice was part of a pilot program to improve targeted marketing called "Relevant Advertising." But it says that the experiment is over, and it has pulled the identifying numbers from their customers' accounts, although it may still sell the data it's collected.