Hello! I'd like to ask everyone's opinion. I donated my old iPhone 4s to someone in India about a year and a half ago. He sent me a picture (attached) this week asking me what could be the cause of his screen malfunctioning. I'd like to know if it's a hardware issue or a software issue so that I can maybe buy a replacement screen before I go on holiday to India in a couple of weeks and fix it myself. Of course, if it's a software issue I can easily just restore it.