Bought my 5s a week after release date to replace an iPhone 4. So Siri is new to me and I was actually enjoying using it. Suddenly after a couple of weeks the voice went muffled, I'm sure you've heard of this bug. I didn't manage to fix the issue, then yesterday 7.0.3 was released and one of the bugs mentioned was this 'lower quality' voice bug. But to my dismay the issue is still here after updating. I've googled and can't seem to find anyone still having the issue. All mentions seem to be from before 7.0.3. Annoyingly the US voice works fine, but I've got used to the Uk voice and would prefer to stick to that. ALSO even when you choose a different voice it still defaults back to the muffled male UK voice for Navigation. Any ideas how to get rid of Siri's blocked nose once and for all as I'm stumped?!