ProPublica reporter/developer here.. There's a tool embedded in the article to see if your carrier is setting a tracking header. We also published a follow-up

ProPublica reporter/developer here.. There's a tool embedded in the article to see if your carrier is setting a tracking header. We also published a follow-up about how AT&T has said they will stop using the header: http://www.propublica.org/article/att-stops-using-undeletable-phone-tracking-ids http://www.propublica.org/article/att-stops-using-undeletabl...