There's an icon for a microphone on my notification bar on my lock screen. As soon as I swipe to unlock, it goes away. I'm not rooted and running stock 4.2.2 on AT&T with MF3 firmware. Anyone know what it is? I'm somehow uncomfortable with a mic that thinks it's 'live" the entire time my phone is off... or locked. I initially suspected it might be part of some voice recognition unlock feature... but I thought I had turned every piece of idiocy off on this phone.