There is one thing that really annoys me on my iPhone 5s: The absence of a blinking front LED for incoming messages, missed calls etc. I really like my iPhone to be totally silent except when there is an incoming call. Other than that I have sound and vibration notifications disabled. I know that I can make the flash on the rear blink but I don't like to lay down my iPhone on its screen. A while ago I read about an app that can make your screen blink when a new message comes in. I didn't try it because I thought it would drain the battery too quickly. I used Google for half an hour now, but I can't find such an app anymore. It would be perfect if it was customizable in a way that it would only blink every minute for a second or so to save battery. That would be enough to see it when it's lying on my desk.