The problem seems to have started about a week ago, where regardless of whether I initiate the call or I'm the one receiving the call. The problem is that after 2-4 minutes whomever I'm talking to starts complaining I'm breaking up or they can't hear me well. I've tried this from inside my apt as well as outside (neither place has been a problem before). The breaking up may vary in duration, but I know for sure at times it clears up and sounds normal, but then it gets bad again shortly after. When the call quality is bad if I take the phone away from my ear and look at cell signal strength it is at full (5 dots) or just under (4 dots). What I have tried: Rebooting phone. Holding it different. Moved locations in apt and gone outside. Any ideas? iPhone 6.