Hey everyone, I bought my iphone 4s the first day it came out and noticed that at least once or twice a day when I make a phone call I will hear my own voice echoing. I will then have to turn off my phone and turn it back on before it starts to work properly. The person I was trying to call can hear my voice, but I can only hear my own echo. I took it into Apple and they did a reset and as soon as I walked out and went to make a call, it started doing it again. I'm going back in there tomorrow to see if I can get it replaced. Has anyone else had this problem, or know what may be causing this? Thanks!