Well i got a call and picked up my pre and what do u know! I could hear nothing and they could hear nothing. So after a min i noticed the little headset icon on the dial pad insted of the speaker thing or whatever it is. I was pissed at first. lol. The phone was stuck in headset mode. I tried resets and messing with the headset jack etc. nothing worked. So i went to the sprint repair center thinking i was getting my 4th pre. And they fixed it! He said its some kind of software glitch. He said he completed a call with it not working then he plugged in the headset made a call and unplugged it during the call then he put it on speaker phone and when he hung up the phone was working again. lol. yea so just beware.