I have a Samsung Stratosphere. About two days ago people I called stopped being able to hear my voice. When people called me I could not hear their voice. I experimented using another phone and discovered that my microphone only works when my speakerphone is turned OFF and I can only hear when my speakerphone is ON. Obviously this creates a problem when trying to talk to someone. I should note that the Bluetooth in my car still works for calls. I looked for settings and applications that might be causing this and found none. I did a factory reset and it changed nothing. What might be causing this / what should I try next?