I opened up a sealed iPhone 5 running iOS 6.0 and all works perfectly fine other than there is no sound from the external speakers. I can hear a phone call with the internal speakers and music will play through earbuds, but the keyboard sounds along with text and phone tones don't work. I know this may have been a software issue as traditional fixes don't work. Is there a Cydia tweak that might work? I'm hopeful as otherwise using this iPhone is a joy.