Hi I'm hoping that someone can provide some advice please. My son has come home from school and has said that his phone was left in his bag and when got out of his back later in the day, the screen was damaged as per the photograph. There is no physical damage to the screen, it isn't cracked but it is not possible to swipe, it just displays as per the photograph. Could someone please advise what is the likely cause of this, if it can be repaired, and if so approx how much would it cost? If I try to make a call to it then the screen displays incoming call but there is no way to answer or switch the phone out of silent mode. I don't believe that the problem is water damage as the phone wouldn't have been near water during school. Hope someone can help. TIA.