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I just replaced my messed up chassis of my 4s and I took apart the phone phone and I put it back together. Now I don't know why everything works fine but the mic only works when I hold the phone up to my ear but not in speaker phone. I was wondering why
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The Speaker assembly (the part that emits volume when the "speaker phone" function is enabled) also acts as a microphone.
Although there are already two microphones throughout the iPhone (one at the top beside the headphone jack and the other on the bottom Left of the iPhone) the Speaker assembly has a duo function and will act as a third microphone to pick up more volume when the iPhone is further away from your mouth.
Sounds to me as though your Speaker Assembly is faulty and you will need to install a new one :( I Hope this helps!
Martin
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