Where is the microphone for Siri for the iPhone 5?

Question

I thought it was at the bottom left on the phone, but when I cover the bottom and blow on the earpiece, the waveform when Siri is waiting for a response moves.

Answer 1

There are three microphones on the iPhone 5. This setup is used to eliminate background noise while on call. One is ideally placed at the back, and two in the front. So basically when you're covering the bottom, the mic on the ear piece picks up the audio input.

Answer 2

It is part of the top mic, camera and proximity unit.