I have an iPhone 5 running iOS 7.1. I often listen to music on my phone using headphones. iOS 7 added a "High Volume Warning" when increasing the volume past a certain point. Quite a nice feature. However, when the device is locked and the volume is changed when in the yellow/red section of the bars, the screen lights up. I find this really irritating, especially when listening to music on a journey at night (when I need the volume to be high for it to be heard over various noises in the cabin.) I can't find any way of turning this off? I was hoping for it to be changed in the iOS 7.1 update, but it wasn't. Is anyone else really irritated by this feature? Has anyone found a way to disable it?