My iPhone 4 microphone that handles standard voice/sound cannot pick-up sound unless the speakerphone, or a headset is used to make/receive calls the other end caller cannot hear me. Any Suggestions? This seems to be common on forums.

My iPhone 4 microphone that handles standard voice/sound cannot pick-up sound unless the speakerphone, or a headset is used to make/receive calls the other end caller cannot hear me. Any Suggestions? This seems to be common on forums. Thank You

Same issue on my wife's iPhone 4S. I suspect it is related to the recent 6.1.2 iOS update (Note: I have a 3S and the update did not cause any issues).
I've tested both bottom and top mics on the 4S using video recorder and both mics work fine. Speakerphone and headset during calls also work fine. The issue is only related to the bottom mic while making calls. I can hear the caller but the caller cannot hear me. If I hold the mic very close to my mouth, the caller can hear a very low level signal.
The problem appears to be software related, not hardware.

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