EVERY iPhone and Android has a secret code attached to it that you can use to hunt it down if it’s been lost or stolen. It’s called an International Mobile Equipment Identity (IMEI) \b… ...

A hacker could exploit a series of vulnerabilities in Belkin home automation gear to turn your Android phone into a secret GPS tracker.

You can see if your smartphone is leaking a unique code on this site. After the findings by researchers, AT&T admitted it's "testing" a new way of tracking its customers for ad display purposes.