Why is my phone not making calls, and why can they not hear otherwise?

I recently replaced the battery and the charging port/AUX port/microphone and afterwards everything worked perfectly except now if I try to make a call it will not ring and will just give me the error that the call failed. I believe that I am receiving calls just fine, but if I get a call or if I somehow manage to make a call then the person on the other side cannot hear me very well at all. I seem to be cutting in and out or just not getting sound to them all together. Any ideas of what this could be, what to check or what I should do?