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Mark
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During a call, the other person can't hear me

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During a phone call on my iPhone 4, the other party can't hear me but I can hear them perfectly.

Voice memos work perfectly and everything else on the phone works perfectly, except for this.

I guess the mic is not the problem, since voice memos work fine.

Maybe Gevey sim is the problem?

Please help, thanks.

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Craig
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Change the dock connector.It sounds like a bad mic, it is attached to the dock connector. I fixed this issue many times with a simple dock connector $10 versus $100.

Edited by: Craig ( )

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Gido Nijenhuis
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I'm sorry to tell but it is 99% sure that your 'audio compiler ic' is the issue. This is the IC which performs the noise cancellation. It is only active during calls and not during memo recording...

Reballing this IC is 99% gonna solve your problem. However this requires special tools and good knowledge to be perfomed...

But during a call when I turn on the speaker mode, I can hear echo because of microphonics. This would suggest that it isn't the "audio compiler" issue. Yes, another thing: I tried calling my iPhone from my home landline phone and I actually managed to have a conversation perfectly well... I think it's Gevey's fault...

Mark,

99% of iPhone problems can be handled without reballing. Mark did well with troubleshooting and is likely right about the gevey. Those sim cards also cause extra heat which can be bad.

Garry,

Did you ever confirm that it was the problem?

Brent Huff,

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ronnie
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i have seen this problem before the work around is to go into settings-general-accessibilty and turn hearing aid mode on. this will turn the microphone off while in a call other than that it will require a resolder of the chip mentioned in previous posts

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