I have an iPhone 5, since May of 2013. Ever since iOS 7 came out, the voices for Siri have been perfect, clear and very human. But, I had my phone replaced a few months ago. It came with iOS 6 installed, and when I upgraded it back to iOS 7, the voice sounded muffled and very robotic. And it still does. It's said that the voices will download after the update, presumably to keep the initial update download size small. But, that never happened. I tried turning on all the high quality voices in the Settings menu (such as the trick under VoiceOver Dialects and Languages) but even with the high quality voices option turned on, Siri still sounds poor. I've tried everything but a software restore. And a software restore is the absolute last thing I want to do. Can anyone give me any suggestions?