I installed Graphene back in Feb my phone makes no sound when it rings unless I have headphones on. In addition people can hear me when i use speaker phone but I cannot hear them. I recently reinstalled graphene to see if it would fix but no I have the same issues. I had a new battery installed about two weeks ago and everything cleared up for about an hour. I am seeing I am not the only person with this issue and I am wanting to switch over to a cape cell plan but I am hoping someone has a fix before i do so!