Hi. I updated my Iphone to iOs 6.1.2 and since then I have no sound on my videos. It records the sound and plays on Facebook, other phones etc. However I have no Speaker picutre when I push my + and - and there is no sound slider bar on videos. Anyone give me any advice on what to do? I've tried to reset & restore my phone and still no joy. It's really starting to peeve me off! lol!