iPhone 4 bottom mic doesnt work when making calls - iPhone 4 - iFixit
iPhone 4s and 5 have separate mics for video and they are not where you (or I) think!. You Learn Something New Everyday – via @marcsettle | Glen Mulcahy's -Mobile Journalism Blog
Köp Baksidesskal till iPhone 4/4S (Lime) - TheMobileStore.se
Where is the microphone located on an iPhone 4S? - Quora