Extra hole on the top

[CreepinJesus]

Does anyone know what the tiny hole on the top of the device is? There's one for the SIM tray, which we all know about, but there's another one the other side of the USB port that isn't mentioned in the manual I received with the phone. Is it another microphone for stereo recording?

 

[Musicman247]

It's a microphone for noise reduction, but will probably be used for stereo recording when that feature comes out later.