I was trying to make a voice call earlier today. I dialled, and the call connected, but I couldn't hear anything. I discovered after a while that I could hear if I used the speakerphone option (using the larger speaker on the back of the tab), but could hear nothing out of the front facing ear speaker. It also would not allow me to turn up the in-call volume; the volume level bar showed up on the screen when I pressed the volume buttons, but wouldn't go up or down. Please help me.