Stores can see where you go by tracking your phone (2014)
phys.org

... Should shoppers turn off their smartphones when they hit the mall? Or does having them on lead to better sales or shorter lines at the cash register?

U.S. retailers are using mobile-based technology to track shoppers' movements at some malls and stores. The companies collecting the information say it's anonymous, can't be traced to a specific person and no one should worry about invasion of privacy. But consumer advocates aren't convinced. It's spying, they say, and shoppers should be informed their phones are being observed and then be able to choose whether to allow it.

The Federal Trade Commission held a workshop Wednesday on the issue, part of a series of privacy seminars looking at emerging technologies and the impact on consumers. FTC attorney Amanda Koulousias says the commission wants to better understand how companies are using phone-location technology, how robust privacy controls are and whether shoppers are notified in advance.

Here's how the technology works: ...