Hello,
I got same problem,
microphone doesn't work. The people I'm calling to can not hear me. When I place it on speaker, they do hear me.
Voice recording also does not work !
I've replaced the dock connector but the problem did not disappear. To be sure I didn't install a faulty microphone, I installed a 3rd one, but still the problem was not solved.
all the audio works, but for the microphone.
Any ideas? is this the audio IC?