Per this article you have stoppped tracking your users:
http://www.theverge.com/2014/11/14/7222617/att-ends-controversial-customer-tracking
There is a link in that article to see if you are being tracked. Here is that link:
I did not pass that test. See above print screens (unfortunatley I couldn't get them to show in the correct order) ...
I have a Lumia 1520 and a BlackBerry Z30 - both were not purchased from you (I paid cash and bought them unlocked.) Since none of your software was ever loaded on these devices there was nothing to opt out of because there is nothing from AT&T even listed on the devices - nothing.
I was surprised I didn't pass the tracking test on the Lumia 1520.
The BlackBerry did pass the test. I have BlackBerry balance and both the work and personal side passed the test.
So it appears whoever is responsible for the OS does factor in here since Microsoft Lumia failed and BlackBerry did not.
It does bother me that you are tracking every single web page I visit off my Lumia.