I disassembled my iphone to replace the home button. I replaced everything but it seems that somehow the headphone jack is switched. Meaning, that when nothing is connected to the headphone jack, it acts as if it is connected. And when the headphones are connected, it acts normal, as if nothing is connected. The only way to use the microphone and hear the caller during a call is to have the headphones connected. Anybody have a clue?