The iPhone contains three microphones: two in the phone itself, and one in the included Apple earbuds. Given the orientation of the microphones in the device, we assume that one is for making calls and the other intended for capturing video and noise cancellation.

The iPhone 4 handset has Knowles S1950 and Infineon 1014 microphones (pictured on the left), while the earbuds contain a Knowles S199 mic.