Every time you download an app, search for a web site, send a text or drive past a store with  your GPS on, your every move may be tracked. by your cell phone company.

"They know you were playing Angry Birds. They know that you drove by Sears.  They know you drove by Dominos pizza, so they can take that and take a very  unique algorithm that can focus on your behavior. It's very impactful," says Mark Johnson, a marketing insider with the Loyalty Marketers Association.

Johnson confirms your datra trail is worth big bucks to cell phone compnaies.

Smartphone use Harrine Freeman is so creeped out, she turns off her GPS when she drives and shops.  She also clears her browser history.

"It does seem creepy that companies are collecting all this information about consumers," says Freeman. "I think it's an invasion of privacy. I don't think cell phone companies should sell your information."

All the major cell phone carriers admit to collecting your info. Verizon acknowledges it sells it to businesses without personally identifying users.  The Cell Phone Trade Association would not agree to be  interviewed on camera, but some cellular companies say  there's an advantage here: you get ads that are relevant and can save you money.