Apparently, there's a problem with the iPhone 6+'s earpiece. The volume is low, that I am almost having trouble to hear the speakers when I am talking to someone on the phone. I've exchanged one iPhone 6+ that also had this problem, but the reason why I exchanged it was for some other defected reason. The new 6+ that I currently use also have the earpiece problem. Not sure if it's a hardware or software issue.