An Android developer recently discovered a clandestine application called Carrier IQ built into most smartphones that doesn’t just track your location; it secretly records your keystrokes. The software is hidden inside phones there is little you can do to detect that it’s even installed, let alone remove it. Keystrokes, browsing and surfing habits, Google searches, and basically every single thing that you are doing on your phone and every button that you press is logged by this software. The company that’s creating this software claims that the point of the software is to deliver “analytics” about devices to the carriers.
Source: https://thehackernews.com/2011/11/your-android-phone-is-spying-on-you-use.html