How to prevent your iOS device from listening in
Reader Steffie L is concerned not about what her iOS devices sees, but rather what it hears. She writes:
With more and more apps listening in at all times on your iOS device (Shazam, etc), short of deleting the app is there any way to control when this happens?
Under iOS 7, yes. One of the features introduced with this version of iOS was the ability to limit apps’ access to the device’s microphone. When you first launch an app that wants to use the mic, you’ll see a dialog box asking if you’re willing to let the app do this. Tap on OK and it now has the access it desires.