http://www.dailywireless.org/2012/12/04/verizon-launches-targeted-advertising/

http://www.att.com/gen/press-room?pid=23597&cdvn=news&newsarticleid=35787&mapcode=wireless

"Today, AT&T announced the launch of AT&T Alerts, a free opt-in, location-based text messaging alerts service that allows AT&T wireless customers nationwide to save money with relevant offers from nearby retailers on their mobile phones. AT&T Alerts uses geo-location technology and consumer preferences to deliver offers and rewards, without having to download an application."