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Are the mics next to the headphone jack able to be replaced or are the attachd to the motherboard?
Replaceable. On your iPhone 4 GSM the upper noise cancellation mic is part of the Power Button Flex Cable. iPhone 4 CDMA and iPhone 4S the upper noise cancellation mic is part of the Headphone Jack Flex Cable.
It's replaceable, but I advise against opening up your iPhone for self repair, unless you know what you're doing of course. It's just easier than not to break something in the process.
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