General :: Galaxy Nexus Mic Works With Certain Apps But Not All

recently I have received a Galaxy Nexus from A sibling because it had a defective charge port. I had replaced it (which included a new mic). I noticed my mic didn't work with phone calls (I understand that people were experiencing a muted effect, I cannot even hear a muffled sound. just fuzzy background recording) as well as with certain apps like snapchat. however with certain apps and features such as Smart Voice Recorder, and Text-to-speech feature, it functioned perfectly with clear recording. I have plugged in a external mic, as well as a two individual headsets with mic feature, and the same problem persist. I have even gone as far as to download the Soundabout app which allows me to decide what my primary recording device is, and still no resolve.